A shell-and-tube polytetrafluoroethylene heat exchanger

Abstract

This utility model relates to the field of heat exchanger technology, and more particularly to a shell-and-tube polytetrafluoroethylene heat exchanger, comprising a shell, a flow guiding assembly fixedly connected to the inner wall of the shell, the flow guiding assembly including a mounting plate, a hollow rod fixedly connected to the bottom inner side of the mounting plate, a compression spring fixedly connected to the inner side of the hollow rod, a guide rod fixedly connected to the upper end of the compression spring, a flow guiding plate fixedly connected to the upper end of the guide rod, multiple flow guiding holes opened on the inner side of the mounting plate, and multiple cleaning components fixedly connected to the lower end of the mounting plate; the cleaning components include a connecting rod, a sliding rod fixedly connected to the lower end of the connecting rod, a support rod slidably connected to the outer side of the sliding rod, a cleaning sponge rotatably connected to the outer side of the support rod, and a telescopic spring fixedly connected to the upper end of the support rod and the lower end of the connecting rod. In this utility model, the flow guiding assembly and the cleaning assembly can wipe away the dirt on the tube wall, effectively ensuring the efficiency of heat conduction and making the overall heat exchanger have a better heat exchange effect.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically a shell-and-tube polytetrafluoroethylene heat exchanger. Background Technology

[0002] Shell-and-tube PTFE heat exchangers, also known as tubular PTFE heat exchangers, are a type of heat exchanger. They are made of PTFE heat exchange tubes and fluoroplastic heat exchange capillary tubes to form a shell-and-tube heat exchange core, which is placed in a steel shell. The ends are fastened and sealed with flange covers. The shell can be installed vertically. The outer body is equipped with a baffle device and also has flanges for connecting the fluid inlet and outlet of the tube side and the shell side. Sealing is achieved by using tight fitting and other methods instead of traditional welding.

[0003] Tubular polytetrafluoroethylene heat exchangers are widely used in heat exchange in highly corrosive fields such as chemical industry, solving the problem of heat transfer in highly corrosive and highly oxidizing media. They can also be used in industrial waste heat recovery, seawater desalination and other scenarios.

[0004] During the operation of a shell-and-tube PTFE heat exchanger, if the fluid contains impurities from chemical materials, calcium and magnesium ions in the cooling water, etc., these impurities and salts will continuously adhere to the tube wall due to intermolecular forces and electrostatic adsorption during the flow. Over time, these substances will gradually deposit and form scale on the tube wall. As the scale layer thickness increases, the resistance to heat conduction increases significantly. The heat that was originally efficiently transferred through the tube wall will be greatly reduced due to the low thermal conductivity of the scale layer, ultimately resulting in a deterioration in the overall heat exchange effect of the heat exchanger.

[0005] Therefore, a tubular polytetrafluoroethylene heat exchanger is proposed to address the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a shell-and-tube polytetrafluoroethylene heat exchanger to solve the problem that impurities and salts are continuously attached to the tube wall during flow due to intermolecular forces and electrostatic adsorption, gradually depositing and forming scale on the tube wall, which leads to a significant reduction in heat transfer efficiency and ultimately a deterioration in the overall heat exchange effect of the heat exchanger.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A tubular polytetrafluoroethylene heat exchanger includes a shell. A flow guiding assembly is fixedly connected to the inner wall of the shell. The flow guiding assembly includes a mounting plate. A hollow rod is fixedly connected to the bottom inner side of the mounting plate. A compression spring is fixedly connected to the inner side of the hollow rod. A guide rod is fixedly connected to the upper end of the compression spring. A flow guiding plate is fixedly connected to the upper end of the guide rod. Multiple flow guiding holes are opened on the inner side of the mounting plate. Multiple cleaning components are fixedly connected to the lower end of the mounting plate. Each cleaning component includes a connecting rod. A sliding rod is fixedly connected to the lower end of the connecting rod. A support rod is slidably connected to the outer side of the sliding rod. A cleaning sponge is rotatably connected to the outer side of the support rod. A telescopic spring is fixedly connected to the upper end of the support rod and the lower end of the connecting rod.

[0009] As a further optimization of this utility model, the following features are provided: a tube bundle is installed inside the housing, a cover plate is fixedly connected to the outside of the housing, the mounting plate has an annular structure, hollow rods are vertically distributed at the bottom of the inner side of the mounting plate, a guide rod is partially embedded inside the hollow rod, and the top of the guide rod extends out above the mounting plate and is fixed to the guide plate.

[0010] As a further optimization of this utility model, the upper surface of the guide plate is an arc-shaped protrusion structure, the protrusion direction of the guide plate faces the top opening of the housing, the edge of the guide plate is adapted to the inner side of the mounting plate, and the guide plate is disposed above the mounting plate.

[0011] As a further optimization of this utility model, the plurality of guide holes are arranged in a circular array with the central axis of the mounting plate as the axis, the spacing between adjacent guide holes is equal, the corners of the guide holes are set with rounded corners, and the included angle between the guide holes is an obtuse angle.

[0012] As a further optimization of this utility model, the number of cleaning components is the same as the number of guide holes, the cleaning components are arranged in a circular array with the central axis of the mounting plate as the axis, and the cleaning components are all perpendicular to the bottom of the mounting plate.

[0013] As a further optimization of this utility model, the axes of the multiple connecting rods coincide with one end of the corresponding guide hole, the lower ends of the multiple connecting rods extend to a position close to the bottom of the housing, and the multiple connecting rods and slide rods are staggered.

[0014] As a further optimization of this utility model, the cleaning sponge has a ring structure, and the number of cleaning sponges is set to multiple, with each cleaning sponge corresponding to a different number of slide rods, and the outer side of the cleaning sponge is in close contact with the inner wall of the housing.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] In this invention, the arc-shaped protrusion of the guide plate, together with the guide rod and compression spring, can dynamically adapt to the fluid flow rate and evenly disperse the inlet fluid. The number and distribution of the cleaning components are adapted to the guide holes. The annular array of cleaning sponges slides along the shell side axial direction and rotates circumferentially by means of fluid power, fully covering the inner wall and continuously wiping away dirt, effectively ensuring the efficiency of heat transfer and making the overall heat exchanger have a better heat exchange effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the shell of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the flow guiding component of this utility model;

[0020] Figure 4 This is a schematic diagram of the installation position of the cleaning component of this utility model;

[0021] Figure 5 This is a schematic diagram of the overall structure of the cleaning component of this utility model;

[0022] Figure 6 This is a schematic diagram of the cross-sectional structure of the cleaning sponge of this utility model.

[0023] In the diagram: 1. Shell; 2. Tube bundle; 3. Cover plate;

[0024] 4. Flow guiding assembly; 41. Mounting plate; 42. Hollow rod; 43. Compression spring; 44. Guide rod; 45. Flow guiding plate; 46. Flow guiding hole;

[0025] 5. Cleaning components; 51. Connecting rod; 52. Slide rod; 53. Telescopic spring; 54. Support rod; 55. Cleaning sponge. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Please see Figures 1-6 This utility model provides a technical solution:

[0029] A tubular polytetrafluoroethylene heat exchanger includes a shell 1. A flow guiding assembly 4 is fixedly connected to the inner wall of the shell 1. The flow guiding assembly 4 includes a mounting plate 41. A hollow rod 42 is fixedly connected to the bottom inner side of the mounting plate 41. A compression spring 43 is fixedly connected to the inner side of the hollow rod 42. A guide rod 44 is fixedly connected to the upper end of the compression spring 43. A flow guiding plate 45 is fixedly connected to the upper end of the guide rod 44. A plurality of flow guiding holes 46 are opened on the inner side of the mounting plate 41. A plurality of cleaning components 5 are fixedly connected to the lower end of the mounting plate 41. The cleaning components 5 include a connecting rod 51. A sliding rod 52 is fixedly connected to the lower end of the connecting rod 51. A support rod 54 is slidably connected to the outer side of the sliding rod 52. A cleaning sponge 55 is rotatably connected to the outer side of the support rod 54. A telescopic spring 53 is fixedly connected to the upper end of the support rod 54 and the lower end of the connecting rod 51.

[0030] As a further implementation of the above technical solution: the cleaning sponge 55 has a ring structure, and there are multiple cleaning sponges 55. The number of cleaning sponges 55 corresponds one-to-one with the number of slide rods 52. The outer side of the cleaning sponge 55 is in close contact with the inner wall of the housing 1. When sliding, it can completely wipe away the dirt on the inner wall, avoid cleaning gaps due to structural mismatch, and ensure that each slide rod 52 drives a group of sponges to work. The movement of the cleaning component 5 can be accurately transmitted to the sponge.

[0031] As a further implementation of the above technical solution: multiple guide holes 46 are arranged in a ring array with the central axis of the mounting plate 41 as the axis, the spacing between adjacent guide holes 46 is equal, the corners of the guide holes 46 are set with rounded corners, and the included angle between the guide holes 46 is an obtuse angle, so that the fluid dispersed by the guide plate 45 can pass through the mounting plate 41 evenly into the lower part of the shell side, accurately cover the outer area of ​​the tube bundle 2, and improve the uniformity of contact between the fluid and the tube bundle 2;

[0032] As a further implementation of the above technical solution: the number of cleaning components 5 is the same as the number of guide holes 46. The cleaning components 5 are arranged in a circular array with the central axis of the mounting plate 41 as the axis. The cleaning components 5 are all perpendicular to the bottom of the mounting plate 41, and the number is adapted to the guide holes 46, ensuring that there is a set of cleaning components 5 below each guide hole 46. After the fluid is diverted through the guide holes 46, it can directly drive the cleaning components 5 to work, so that the inner wall of the shell side is cleaned without dead corners.

[0033] As a further implementation of the above technical solution: the axes of multiple connecting rods 51 coincide with one end of the corresponding guide hole 46, the lower ends of multiple connecting rods 51 extend to a position close to the bottom of the housing 1, and the multiple connecting rods 51 and slide rods 52 are staggered to allow the cleaning range of the cleaning component 5 to cover the entire axial direction of the housing, so as to avoid the bottom of the housing 1 being uncleaned due to low fluid flow rate and easy accumulation of dirt.

[0034] As a further implementation of the above technical solution: a tube bundle 2 is installed inside the shell 1, a cover plate 3 is fixedly connected to the outside of the shell 1, the mounting plate 41 has a ring structure, hollow rods 42 are vertically distributed at the bottom of the inner side of the mounting plate 41, a guide rod 44 is partially embedded inside the hollow rod 42, and the top of the guide rod 44 extends out of the mounting plate 41 and is fixed to the guide plate 45, so that the axial movement of the guide plate 45 is precise and smooth, and can stably withstand fluid impact and dynamically adjust.

[0035] As a further implementation of the above technical solution: the upper surface of the guide plate 45 is an arc-shaped protrusion structure, the protrusion direction of the guide plate 45 faces the top opening of the housing 1, the edge of the guide plate 45 is adapted to the inner side of the mounting plate 41, the guide plate 45 is set above the mounting plate 41, the arc-shaped protrusion guides the fluid to diffuse in all directions, and guides the concentrated inlet fluid to the guide hole 46.

[0036] Working process: The core of the shell-and-tube PTFE heat exchanger is the counter- or co-current flow of two fluids in the tube side and shell side. High-temperature corrosive media and fouling enter the tube side from the inlet of tube bundle 2, flow inside the PTFE tube bundle 2, and transfer heat to the shell-side cooling medium through the tube walls. After cooling, the heat is discharged from the outlet of tube bundle 2. When it is necessary to clean the fouling on the inner wall of shell 1, the shell 1 cleaning requires disassembling the end caps and inserting a special nozzle of a high-pressure water gun into the inlet of shell 1. The sprayed water first impacts the guide plate 45. Because the upper surface of the guide plate 45 is an arc-shaped convex structure facing the top of shell 1, the fluid is dispersed along the arc surface, initially changing the flow direction and avoiding direct impact on tube bundle 2, which could cause excessively high local flow velocities. Impact wear occurs when the guide plate 45 is impacted by the fluid, causing the guide rod 44 to move axially along the hollow rod 42. At this time, the compression spring 43 inside the hollow rod 42 is compressed, adapting to changes in fluid flow and pressure. The arc-shaped protrusion of the guide plate 45 guides the fluid to diffuse in all directions. When it moves to the bottom of the mounting plate 41 according to the impact force, the fluid will flow into the guide hole 46 provided on the inner side of the mounting plate 41. When the fluid passes through the guide hole 46, the rounded corner structure reduces fluid resistance, allowing the fluid to pass smoothly. The annular array distribution allows the fluid to be evenly flushed against the inner wall of the housing 1. After the shell-side fluid is diverted through the guide hole 46, it flows simultaneously to the cleaning component 5 below the mounting plate 41. The fluid impacts the connecting rod 51 of the cleaning component 5. The sliding rod 52 triggers the cleaning action. The fluid drives the sliding rod 52 to slide along the support rod 54, compressing the telescopic spring 53. The cleaning sponge 55 on the outside of the support rod 54 moves with the sliding rod 52. At the same time, due to fluid disturbance, the cleaning sponge 55 can rotate around the support rod 54. The sliding rod 52 drives the cleaning sponge 55 to move back and forth along the shell side axial direction. Utilizing the friction between the sponge and the inner wall of the shell side, the scale and impurities attached to the inner wall are wiped away. Due to the impact of fluid turbulence, the cleaning sponge 55 rotates around the support rod 54, achieving comprehensive cleaning of the inner wall of the shell side in the circumferential direction, avoiding cleaning dead corners. Because the cleaning components 5 and the guide holes 46 correspond one-to-one and are distributed in a ring array, multiple cleaning sponges 55 work together to completely cover the axial and circumferential areas of the inner wall of the shell 1, achieving dynamic and continuous self-cleaning.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A shell-and-tube polytetrafluoroethylene heat exchanger, comprising a shell (1), characterized in that: The inner wall of the housing (1) is fixedly connected to a flow guiding assembly (4). The flow guiding assembly (4) includes a mounting plate (41). A hollow rod (42) is fixedly connected to the bottom inner side of the mounting plate (41). A compression spring (43) is fixedly connected to the inner side of the hollow rod (42). A guide rod (44) is fixedly connected to the upper end of the compression spring (43). A flow guiding plate (45) is fixedly connected to the upper end of the guide rod (44). Multiple flow guiding holes (46) are opened on the inner side of the mounting plate (41). Multiple cleaning components (5) are fixedly connected to the lower end of the mounting plate (41). The cleaning component (5) includes a connecting rod (51), a slide rod (52) is fixedly connected to the lower end of the connecting rod (51), a support rod (54) is slidably connected to the outside of the slide rod (52), a cleaning sponge (55) is rotatably connected to the outside of the support rod (54), and a telescopic spring (53) is fixedly connected to the upper end of the support rod (54) and the lower end of the connecting rod (51).

2. The tubular polytetrafluoroethylene heat exchanger according to claim 1, characterized in that: The housing (1) is equipped with a tube bundle (2) on its inner side, and a cover plate (3) is fixedly connected to the outer side of the housing (1). The mounting plate (41) has an annular structure. The hollow rod (42) is vertically distributed at the bottom of the inner side of the mounting plate (41). The guide rod (44) is partially embedded in the inner side of the hollow rod (42). The top end of the guide rod (44) extends out of the mounting plate (41) and is fixed to the guide plate (45).

3. A tubular polytetrafluoroethylene heat exchanger according to claim 1, characterized in that: The upper surface of the guide plate (45) is an arc-shaped protrusion structure. The protrusion direction of the guide plate (45) is open towards the top of the housing (1). The edge of the guide plate (45) is adapted to the inner side of the mounting plate (41). The guide plate (45) is set above the mounting plate (41).

4. A tubular polytetrafluoroethylene heat exchanger according to claim 1, characterized in that: The multiple guide holes (46) are arranged in a ring array with the central axis of the mounting plate (41) as the axis. The spacing between adjacent guide holes (46) is equal. The corners of the guide holes (46) are set with rounded corners. The included angle between the guide holes (46) is an obtuse angle.

5. A tubular polytetrafluoroethylene heat exchanger according to claim 1, characterized in that: The number of cleaning components (5) is the same as the number of guide holes (46). The cleaning components (5) are arranged in a ring array with the central axis of the mounting plate (41) as the axis. The cleaning components (5) are all perpendicular to the bottom of the mounting plate (41).

6. A tubular polytetrafluoroethylene heat exchanger according to claim 1, characterized in that: The axes of the multiple connecting rods (51) coincide with one end of the corresponding guide hole (46), and the lower ends of the multiple connecting rods (51) extend to a position close to the bottom of the housing (1). The multiple connecting rods (51) and the slide rod (52) are staggered.

7. A tubular polytetrafluoroethylene heat exchanger according to claim 1, characterized in that: The cleaning sponge (55) has a ring structure, and there are multiple cleaning sponges (55). The number of cleaning sponges (55) corresponds one-to-one with the number of slide rods (52). The outer side of the cleaning sponge (55) is in close contact with the inner wall of the shell (1).

Images