Efficient self-cleaning device in heat exchange tube

Abstract

The utility model discloses an efficient self-cleaning device in a heat exchange tube. The efficient self-cleaning device comprises a scraper device, the heat exchange tube, a spring, a fixed end and an end cover. The scraping blade device comprises a central shaft and a scraping blade, and the scraping blade is fixed on the central shaft; one end of the fixed end is fixed at one end of the heat exchange tube, and the end cover is mounted at the other end of the fixed end; one end of the spring is hung on the end cover, and the other end is hung on the scraper device. According to the utility model, a self-operated mode is adopted, so that automatic operation of the scale cleaning part is realized, and extra manpower and energy do not need to be consumed; the center shaft is made of a hollow pipe and a light material, gravity-buoyancy dynamic balance is achieved, it is guaranteed that the scraper and the heat exchange pipe run concentrically, and the stuck failure rate is reduced. The scraper blade adopts a spiral curved surface structure, generates high-intensity turbulent flow, destroys a thermal boundary layer, and has the functions of dirt removal and heat transfer enhancement. The dirt deposition probability is reduced through fluid disturbance, and the heat transfer coefficient is greatly increased; flow change is dynamically responded through the spring device, and the axial movement of the scraper is adjusted.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger tube descaling technology, specifically to a high-efficiency self-cleaning device for heat exchanger tubes. Background Technology

[0002] In water environments with high hardness, such as water bodies with high calcium and magnesium ions and oily wastewater, conventional heat exchangers commonly suffer from the industry pain points of rapid heat transfer efficiency decline and high operation and maintenance costs. Taking typical application scenarios such as power plant condensers, oilfield wastewater heat exchangers, and wastewater source heat pump evaporators as examples, the common technical challenges they face are: 1) Dense scale layers form on the inner wall of the heat exchange tubes due to medium crystallization, leading to a significant increase in thermal resistance; 2) Flow rate reduction is caused by flow channel blockage due to suspended solids deposition; 3) Existing anti-scaling technologies rely on periodic manual intervention, resulting in significant production losses due to scale removal operations, the risk of secondary pollution from the use of chemical agents, and high investment in physical cleaning equipment. Therefore, it is necessary to propose a high-efficiency self-cleaning device for the heat exchange tubes to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a highly efficient self-cleaning device for heat exchange tubes, thereby solving the problem of scale buildup and blockage in heat exchange tubes under specific operating conditions in existing heat exchange equipment.

[0004] This utility model provides a high-efficiency self-cleaning device for heat exchange tubes, comprising: a scraper device, a heat exchange tube, a spring, a fixed end, and an end cap; the scraper device includes a central shaft and a scraper, the scraper being fixed on the central shaft, and the scraper device being disposed inside the heat exchange tube; one end of the fixed end is fixed to one end of the heat exchange tube, and the end cap is installed on the other end of the fixed end; one end of the spring is hung on the end cap, and the other end of the spring is hung on the scraper device.

[0005] Furthermore, the connection between the fixed end and the heat exchange tube is a threaded connection.

[0006] Furthermore, the central axis is a hollow tube.

[0007] Furthermore, the scraper is a spiral blade.

[0008] This invention offers the following advantages: The high-efficiency self-cleaning device for heat exchange tubes utilizes a self-standing mechanism to automatically operate the cleaning components, eliminating the need for additional manpower and energy. The central shaft, made of a hollow tube and lightweight material, achieves dynamic gravity-buoyancy balance, ensuring concentric operation of the scraper and heat exchange tube, thus reducing the risk of jamming. The scraper employs a helical curved surface configuration, generating high-intensity turbulence, disrupting the thermal boundary layer, and combining fouling removal with enhanced heat transfer. This design reduces the probability of fouling deposition through fluid disturbance, significantly improving the heat transfer coefficient. By dynamically responding to flow changes through a spring device and adjusting the axial movement of the scraper, this invention adapts to operating conditions in real time compared to existing technologies, reducing cleaning time and frequency, and improving efficiency. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of the high-efficiency heat exchange tube self-cleaning device of this utility model;

[0011] Figure 2 This is a schematic diagram of the scraper structure of the high-efficiency heat exchanger tube self-cleaning device of this utility model;

[0012] Figure 3 This is a schematic diagram of the fixed end structure of the high-efficiency heat exchanger tube self-cleaning device of this utility model.

[0013] Illustration: 1-Scraper device; 2-Heat exchange tube; 3-Spring; 4-Fixed end; 5-End cover; 11-Central shaft; 12-Scraper. Detailed Implementation

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be pointed out that the following detailed description is illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0015] Please see Figures 1 to 3This utility model provides a high-efficiency self-cleaning device for heat exchange tubes, comprising: a scraper device 1, a heat exchange tube 2, a spring 3, a fixed end 4, and an end cap 5. The scraper device 1 includes a central shaft 11 and a scraper 12, with the scraper 12 fixed to the central shaft 11; the scraper device 1 is disposed inside the heat exchange tube 2. One end of the fixed end 4 is fixed to one end of the heat exchange tube 2, and the end cap 5 is installed on the other end of the fixed end 4; one end of the spring 3 is hung on the end cap 5, and the other end is hung on the scraper device 1.

[0016] Preferably, the scraper 12 adopts a spiral structure, which generates a large amount of turbulence when the medium flows through, enhances the degree of turbulence, destroys the boundary layer near the pipe wall, reduces the probability of dirt deposition, and enhances the heat transfer effect. The appropriate diameter of the central shaft 11 and the scraper 12 are selected according to the specifications of the heat exchange tube 2, and the roundness of the scraper 12 must be ensured after processing.

[0017] Preferably, the central shaft 11 is a hollow tube made of lightweight material, so that the overall weight of the scraper device is equal to the buoyancy of the medium on it, ensuring that the scraper device and the heat exchange tube are concentric and preventing jamming.

[0018] Preferably, the scraper 12 is made of lightweight material, which can withstand the axial force of the water flow while ensuring the required flow rate, so as to ensure that the scraper device moves along the axial direction and cleans the dirt.

[0019] A spring 3 is used inside the fixed end 4. When the flow rate is different, the axial force on the scraper device is different, and the spring compression or stretching deformation is different. This can drive the scraper device to reciprocate in the direction of the heat exchange tube axis to scrape the dirt inside the tube.

[0020] The self-cleaning principle of the high-efficiency heat exchanger tube self-cleaning device provided in this embodiment is as follows: Wastewater flows into the heat exchanger tube from one end. Depending on the type of spring used, when a tension spring is selected, the water flows in from the fixed end; when a compression spring is selected, the water flows in from the other side. Taking a tension spring as an example, when the water flows into the heat exchanger tube from the fixed end, according to Bernoulli's principle, the water flow will give the scraper device an axial thrust, causing the entire scraper device to move along the direction of water flow. The spiral blades begin to scrape the dirt on the tube wall, and the spring is stretched. When the scraper device moves to a certain position, which is greater than the pitch of the spiral blades, the thrust of the water on the scraper device is equal to the spring tension, and the scraper device is at the equilibrium point and remains stationary. When the water flow rate decreases, the spring tension is greater than the thrust, and the scraper device moves back to the fixed end to complete the scraping again. In this way, the scraper device continuously reciprocates along the axial direction of the heat exchanger tube according to the water flow rate, completing the self-cleaning process.

[0021] This utility model presents a high-efficiency self-cleaning device for heat exchange tubes. Utilizing the kinetic energy of the fluid itself, it achieves self-cleaning of the heat exchange tubes without consuming additional power. It employs a dynamic-response scraper drive system: a variable spring device is installed in the fixed end, driving the scraper assembly to reciprocate along the heat exchange tube axis based on the axial force difference caused by changes in medium flow rate, achieving adaptive mechanical scraping under various operating conditions. It utilizes a composite enhanced heat transfer structure: the scraper adopts a helical curved surface configuration, with geometric parameters satisfying the Reynolds number enhancement criterion, inducing three-dimensional turbulence in the medium, effectively disrupting the thermal boundary layer, and simultaneously achieving the dual functions of fouling removal and enhanced heat transfer. A buoyancy balance system is employed: the central shaft uses a hollow tube structure, and the scraper assembly is made of lightweight alloy material. Through precise buoyancy-gravity matching design, it ensures that the moving parts remain dynamically concentric with the heat exchange tube, preventing uneven wear and jamming. It is suitable for heat exchange scenarios involving various high-hardness liquid media, effectively improving the overall heat transfer intensity of the heat exchanger while reducing equipment blockage and downtime for maintenance, providing strong support for energy conservation and emission reduction in enterprises.

[0022] 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.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in sequences other than those illustrated or described herein.

[0024] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-efficiency self-cleaning device for heat exchange tubes, characterized in that, include: The scraper device (1), heat exchange tube (2), spring (3), fixed end (4), and end cap (5); The scraper device (1) includes a central shaft (11) and a scraper (12). The scraper (12) is fixed on the central shaft (11). The scraper device (1) is located inside the heat exchange tube (2). One end of the fixed end (4) is fixed to one end of the heat exchange tube (2). The end cap (5) is installed on the other end of the fixed end (4). One end of the spring (3) is hung on the end cap (5). The other end of the spring (3) is hung on the scraper device (1).

2. The high-efficiency heat exchange tube self-cleaning device as described in claim 1, characterized in that, The connection between the fixed end (4) and the heat exchange tube (2) is a threaded connection.

3. The high-efficiency heat exchanger tube self-cleaning device as described in claim 1, characterized in that, The central shaft (11) is a hollow tube.

4. The high-efficiency heat exchanger tube self-cleaning device as described in claim 1, characterized in that, The scraper (12) is a spiral blade.

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