Heat exchanger outer guide cylinder structure
Patent Information
- Application Number
- CN202522309010.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-10-31
AI Technical Summary
这种通过栅孔进出壳体的结构会增大流体压降，存在堵塞风险
（1）与现有技术中通过栅孔进出壳体的结构相比，本实用新型外导流筒结构，流体流经时的压降降低、堵塞的风险降低；且本申请结构的整体设置，使壳体流体在接管与换热器壳体之间流经路径变长，进一步提升了导流效果。
Smart Images
Figure CN224838634U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of heat exchanger technology, specifically relating to an external guide tube structure for a heat exchanger. Background Technology
[0002] Shell-and-tube heat exchangers typically feature an external guide tube at the shell-side inlet to guide the shell-side fluid along a specific path. This serves two purposes: firstly, it prevents direct impact on the tube bundle, and secondly, it regulates the fluid velocity, preventing excessively high local velocities. Existing shell-and-tube heat exchangers have perforated external guide tubes installed in the shell at the corresponding inlet or outlet positions. At the inlet, the shell-side fluid flows through a connecting pipe into the annular space between the outer and inner liner tubes, then through the perforations on the inner liner tube into the shell. At the outlet, the shell-side fluid flows through the perforations on the inner liner tube into the annular space between the outer and inner liner tubes, then through a connecting pipe for discharge. This perforated inlet and outlet structure increases the fluid pressure drop, posing a risk of blockage. Utility Model Content
[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a heat exchanger external guide tube structure.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: An external guide tube structure for a heat exchanger includes a heat exchanger shell; At least one end of the heat exchanger shell is surrounded by a flow guiding assembly. The flow guiding assembly includes an outer cylinder coaxially disposed outside the heat exchanger shell. One axial end of the outer cylinder is vertically fixed to the outer side wall of the heat exchanger shell through an annular plate. The other axial end of the outer cylinder is sealed to surround the corresponding end of the heat exchanger shell. The outer cylinder is provided with a pipe that connects to the annular space between the heat exchanger shell and the outer cylinder.
[0005] Preferably, a conical shell is coaxially fixed at one end of the outer cylinder away from the annular plate, the large end of the conical shell is fixedly connected to the outer cylinder, and a sealing plate is fixedly installed at the small end of the conical shell.
[0006] Preferably, the angle between the generatrix of the conical shell and the central axis is 30° to 45°.
[0007] Preferably, the maximum area of the cross-section perpendicular to its own central axis in the inner wall of the nozzle is M, and the area of the cross-section perpendicular to its own central axis in the annular space between the heat exchanger shell and the outer cylinder is N. Then N≥M.
[0008] Preferably, the inner wall diameter of the heat exchanger shell is the same as the small end diameter of the inner wall of the conical shell.
[0009] Preferably, the annular plate is welded to the heat exchanger shell and the outer cylinder.
[0010] Preferably, the connecting pipe is welded to the outer cylinder.
[0011] Preferably, the conical shell is welded to the outer cylinder and the sealing plate.
[0012] The beneficial effects of this utility model are: (1) Compared with the structure of the shell entering and exiting through the grid hole in the prior art, the external guide tube structure of this utility model reduces the pressure drop and the risk of blockage when the fluid flows through it; and the overall setting of the structure of this application makes the flow path of the shell fluid between the pipe and the heat exchanger shell longer, which further improves the flow guiding effect.
[0013] (2) The conical shell in this utility model provides better flow guidance for the shell-side fluid to flow between the annular space and the heat exchanger shell, reduces local resistance, and reduces flow dead zones.
[0014] (3) In this utility model, when the shell-side fluid flows between the annular space and the heat exchanger shell, it undergoes a 180° bend. The 180° bend forces the fluid to make a violent turn, destroys the original flow boundary layer, enhances the turbulence intensity, and significantly improves the heat transfer coefficient. Attached Figure Description
[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.
[0016] Figure 1 This is a schematic diagram of the external guide tube structure of the heat exchanger of this utility model; Figure 2 This is a schematic diagram of the flow path of the shell-side fluid entering through the nozzle in the external guide tube structure of the heat exchanger of this utility model. Figure 3 This is a schematic diagram of the flow path of the shell-side fluid flowing out of the heat exchanger shell in the external guide tube structure of the heat exchanger of this utility model. in: 1. Heat exchanger shell; 2. Outer cylinder; 3. Annular plate; 4. Connecting pipe; 5. Conical shell. Detailed Implementation
[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0018] like Figure 1As shown, a heat exchanger external guide tube structure includes a heat exchanger shell 1; At least one end of the heat exchanger shell 1 is surrounded by a flow guiding assembly. The flow guiding assembly includes an outer cylinder 2 coaxially disposed outside the heat exchanger shell 1. One axial end of the outer cylinder 2 is vertically fixed to the outer side wall of the heat exchanger shell 1 through an annular plate 3. The other axial end of the outer cylinder 2 is sealed to surround the corresponding end of the heat exchanger shell 1. The outer cylinder 2 is provided with a pipe 4 that connects to the annular space between the heat exchanger shell 1 and the outer cylinder 2.
[0019] Preferably, a conical shell 5 is coaxially fixed at one end of the outer cylinder 2 away from the annular plate 3, the large end of the conical shell 5 is fixedly connected to the outer cylinder 2, and a sealing plate is fixedly installed at the small end of the conical shell 5.
[0020] The conical shell 5 provides better flow guidance for the shell-side fluid between the annular space and the heat exchanger shell 1, reducing local resistance and minimizing dead zones.
[0021] In this application, such as Figure 2 As shown, the flow path of the shell-side fluid entering through the nozzle 4 is as follows: it enters the annular space between the heat exchanger shell 1 and the outer cylinder 2 through the nozzle 4, then moves along the annular space towards the sealing end of the outer cylinder 2, and then enters through the port of the heat exchanger shell 1 near the sealing end of the outer cylinder 2. like Figure 3 As shown, the flow path of the shell-side fluid flowing out of the heat exchanger shell 1 is as follows: it flows out from the port of the heat exchanger shell 1 to the sealing end of the outer cylinder 2, then enters the annular space between the heat exchanger shell 1 and the outer cylinder 2, and finally flows out through the pipe 4.
[0022] When the shell-side fluid flows between the annular space and the heat exchanger shell 1, it undergoes a 180° bend. This 180° bend forces the fluid to make a sharp turn, disrupting the original flow boundary layer, enhancing the turbulence intensity, and significantly improving the heat transfer coefficient.
[0023] Preferably, the angle between the generatrix of the conical shell 5 and the central axis is 30° to 45°.
[0024] Preferably, the maximum area of the cross-section perpendicular to its own central axis in the inner wall of the pipe 4 is M, and the area of the cross-section perpendicular to its own central axis in the annular space between the heat exchanger shell 1 and the outer cylinder 2 is N. Then N≥M.
[0025] Preferably, the inner wall diameter of the heat exchanger shell 1 is the same as the small end diameter of the inner wall of the conical shell 5.
[0026] Preferably, the annular plate 3 is welded to the heat exchanger shell 1 and the outer cylinder 2.
[0027] Preferably, the connecting pipe 4 is welded to the outer cylinder 2.
[0028] Preferably, the conical shell 5 is welded to the outer cylinder 2 and the sealing plate.
[0029] Compared with the existing structure in which fluid enters and exits the shell through the grid holes, the external guide tube structure of this application reduces the pressure drop and the risk of blockage when the fluid flows through it; and the overall design of this application makes the flow path of the fluid between the pipe 4 and the heat exchanger shell 1 longer, further improving the flow guiding effect.
[0030] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, they are not intended to limit the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the protection scope of the present utility model.
Claims
1. A heat exchanger external guide tube structure, characterized in that, Including the heat exchanger shell (1); At least one end of the heat exchanger shell (1) is surrounded by a flow guiding assembly, which includes an outer cylinder (2) coaxially disposed outside the heat exchanger shell (1). One axial end of the outer cylinder (2) is vertically fixed to the outer side wall of the heat exchanger shell (1) through an annular plate (3). The other axial end of the outer cylinder (2) is sealed to surround the corresponding end of the heat exchanger shell (1). The outer cylinder (2) is provided with a pipe (4) that connects to the annular space between the heat exchanger shell (1) and the outer cylinder (2).
2. The heat exchanger external guide tube structure as described in claim 1, characterized in that, A conical shell (5) is coaxially fixed at one end of the outer cylinder (2) away from the annular plate (3). The large end of the conical shell (5) is fixedly connected to the outer cylinder (2), and a sealing plate is fixedly installed at the small end of the conical shell (5).
3. The heat exchanger external guide tube structure as described in claim 2, characterized in that, The angle between the generatrix of the conical shell (5) and the central axis is 30°~45°.
4. The heat exchanger external guide tube structure as described in claim 1, characterized in that, The maximum area of the cross-section perpendicular to its own central axis in the inner wall of the pipe (4) is M, and the area of the cross-section perpendicular to its own central axis in the annular space between the heat exchanger shell (1) and the outer cylinder (2) is N. Then N≥M.
5. The heat exchanger external guide tube structure as described in claim 2, characterized in that, The inner wall diameter of the heat exchanger shell (1) is the same as the small end diameter of the inner wall of the conical shell (5).
6. The heat exchanger external guide tube structure as described in claim 1, characterized in that, The annular plate (3) is welded to the heat exchanger shell (1) and the outer cylinder (2).
7. The heat exchanger external guide tube structure as described in claim 1, characterized in that, The connecting pipe (4) is welded to the outer cylinder (2).
8. The heat exchanger external guide tube structure as described in claim 2, characterized in that, The conical shell (5) is welded to the outer cylinder (2) and the sealing plate.