Shell and tube heat exchanger capable of avoiding liquid mixing caused by poor manufacturing

Abstract

The utility model relates to the technical field of heat exchange equipment, in particular to a shell and tube heat exchanger capable of avoiding liquid mixing caused by poor manufacturing, which comprises a heat exchanger shell, and an assembling mechanism for preventing media from being mixed is arranged on the heat exchanger shell. According to the shell-and-tube heat exchanger, the assembling mechanism is arranged, the integrally-formed U-shaped pipe is adopted, the U-shaped pipe, the shell-and-tube heat exchanger shell and the heat exchange end plate A form a sealed cavity, meanwhile, the heat exchange end plate B, the heat exchange end cover and the U-shaped heat exchange pipe form another independent cavity, and the two cavities are independent of each other; by arranging the assembling mechanism, due to the fact that the two cavities are independent of each other and reasonable in structural design, when leakage occurs in a welding gap, leaked media can appear in the corresponding cavities, a worker can find the leakage situation in the first time, and the working efficiency is improved. Maintenance measures are taken in time, and the reliability and maintainability of the equipment are improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, and in particular to a shell-and-tube heat exchanger that avoids liquid mixing caused by poor manufacturing. Background Technology

[0002] Shell-and-tube heat exchangers are a common type of heat exchange equipment widely used in various production and living scenarios. Their basic working principle is that the same or two different heat exchange media flow independently in the shell side and tube side. Heat is transferred from the high-temperature medium to the low-temperature medium through the heat exchange tubes. The core function is to ensure effective heat transfer and prevent the heat exchange media of different temperatures from mixing.

[0003] Conventional shell-and-tube heat exchangers mainly consist of a shell, end caps, end plates, heat exchange tubes, and sealing components. The end plates and heat exchange tubes are isolated from fluids of different temperatures through pipe expansion or welding. However, after prolonged use, the end plates and heat exchange tubes may fail due to fatigue caused by temperature changes, leading to sealing failure and the mixing of hot and cold media. In certain situations, this mixing can cause serious consequences such as the failure of specific media or contamination rendering the equipment unusable. Furthermore, since the end plates and heat exchange tubes of conventional heat exchangers are internal, leaks are often not detected immediately, usually only becoming apparent much later when the liquid separates into layers, potentially causing significant losses. Therefore, we provide a shell-and-tube heat exchanger that avoids liquid mixing caused by poor manufacturing. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a shell-and-tube heat exchanger that avoids media mixing caused by poor manufacturing. It solves the technical problem that heat exchangers in the prior art are prone to media mixing and leakage, which leads to a reduction in heat exchange efficiency. This invention improves the sealing performance of the heat exchanger to avoid media mixing and enables rapid identification and response to leakage problems.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a shell-and-tube heat exchanger that avoids liquid mixing caused by poor manufacturing, comprising a heat exchanger shell, wherein the heat exchanger shell is provided with an assembly mechanism to prevent medium mixing and leakage.

[0006] The assembly mechanism includes a heat exchange tube installed inside the heat exchanger shell. A heat exchange end plate A is installed at one end of the heat exchanger shell and connected to the bent outer port of the heat exchange tube. A heat exchange end plate B is installed at the other end of the heat exchanger shell and connected to the inner port of the heat exchange tube. A heat exchanger end cover is installed on the outer side of the heat exchange end plate B.

[0007] Preferably, the heat exchange tube is an integrally formed U-shaped tube, and the heat exchange tube, the heat exchanger shell, and the heat exchange end plate A form a sealed cavity.

[0008] Preferably, the heat exchange end plate A is connected to the heat exchanger shell and the outer port of the heat exchange tube by welding, and the heat exchange end plate B is connected to the inner straight pipe section port of the heat exchange tube by welding.

[0009] Preferably, the heat exchanger shell is made entirely of 316L stainless steel, and the heat exchanger shell, the heat exchange end plate B, and the heat exchanger end cover form an independent cavity.

[0010] Preferably, the surface of the heat exchanger shell is polished, and the design pressure of the heat exchange tube side is 3.0 MPa.

[0011] Preferably, a baffle plate is installed on the heat exchanger shell, and a drain port is provided at the baffle plate. A sealing gasket is provided between the heat exchanger end cover and the heat exchange end plate B.

[0012] By employing the above technical solution, this utility model provides a shell-and-tube heat exchanger that avoids liquid mixing caused by poor manufacturing, and has at least the following beneficial effects:

[0013] 1. This utility model, by setting up an assembly mechanism, adopts an integrally formed U-shaped tube, which forms a sealed cavity with the shell and tube heat exchanger shell and heat exchange end plate A. At the same time, heat exchange end plate B, heat exchange end cover and U-shaped heat exchange tube form another independent cavity, realizing that the two cavities are independent of each other, thereby avoiding serious problems such as special medium failure and contamination caused by medium mixing, and ensuring the safety and stability of the heat exchange process.

[0014] 2. By setting up an assembly mechanism, this utility model has two independent cavities with a reasonable structural design. When leakage occurs in the weld seam, the leaking medium will appear in the corresponding cavity, which allows the staff to detect the leakage at the first time and take timely maintenance measures. This avoids huge losses caused by leakage going undetected for a long time and improves the reliability and maintainability of the equipment. Attached Figure Description

[0015] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0016] In the attached diagram:

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

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

[0019] Figure 3 This is a schematic diagram of the planar structure of this utility model from a bottom view;

[0020] Figure 4 This is a schematic diagram of the side planar structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the side cross-sectional planar structure of this utility model.

[0022] In the diagram: 1. Heat exchanger shell;

[0023] 2. Assembly mechanism; 21. Heat exchanger tube; 22. Heat exchanger end plate A; 23. Heat exchanger end plate B; 24. Heat exchanger end cover. Detailed Implementation

[0024] 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.

[0025] Example 1

[0026] Existing heat exchangers are prone to problems such as medium mixing and leakage, leading to reduced heat exchange efficiency. This embodiment provides a shell-and-tube heat exchanger that avoids liquid mixing caused by poor manufacturing. Please refer to [link / reference]. Figure 1 - Figure 5This design improves the sealing performance of the heat exchanger, preventing media mixing and enabling rapid identification and response to leakage problems. The shell-and-tube heat exchanger, designed to prevent mixing caused by poor manufacturing, includes a heat exchanger shell 1 made entirely of 316L stainless steel. 316L stainless steel offers excellent corrosion resistance, adaptability to complex environments, and good mechanical properties, enhancing the device's impact and vibration resistance and extending its service life. The heat exchanger shell 1, along with the heat exchange end plate B23 and the heat exchange end cover 24, forms an independent cavity, creating two independent spaces that effectively prevent media mixing and improve heat exchange efficiency. The surface of heat exchanger shell 1 is polished to reduce surface roughness, prevent stagnation zones caused by slow fluid flow, and inhibit scale formation. Baffles are installed on the heat exchanger shell 1 to cover the fluid flow direction, increase turbulence, and support the heat exchange tubes 21 to prevent vibration and deformation. Drainage ports are located at the baffles to drain the liquid and medium from the shell during shutdown and also provide leakage monitoring to ensure long-term stable operation under complex conditions. An assembly mechanism 2 is installed on the heat exchanger shell 1 to prevent media mixing and leakage. Assembly mechanism 2 creates two independent sealed cavities to prevent media mixing due to seal failure. The structure of the two independent cavities allows for rapid detection of leaks through external visual inspection (e.g., liquid seepage) or pressure monitoring, reducing economic losses caused by delayed repairs due to leaks and improving equipment reliability and maintenance efficiency.

[0027] Conventional shell-and-tube heat exchangers consist of a shell, end caps, end plates, heat transfer tubes, and sealing components. However, after prolonged use, they are prone to sealing failure and medium mixing due to thermal fatigue, and internal leaks are difficult to detect in a timely manner, easily leading to losses. To address these issues, the assembly mechanism 2 includes heat exchange tubes 21 installed inside the heat exchanger shell 1. The heat exchange tubes 21 are integrally molded U-shaped tubes. The curved structure of the U-shaped tubes guides the fluid to form turbulent flow inside the tube, reducing the boundary layer thickness, enhancing heat transfer, and also reducing connection gaps, improving sealing. Furthermore, the heat exchange tubes 21, the heat exchanger shell 1, and the heat exchange end plate A22 form a sealed cavity, thus creating a closed and independent first cavity that can accommodate a single heat transfer medium. The design pressure of the tube side of the heat exchange tubes 21 is 3.0 MPa, meeting the actual requirements of current high-pressure operating conditions while also achieving a more robust design. The structural strength matching and safety redundancy design ensure long-term stable operation of the equipment in complex environments. One end of the heat exchanger shell 1 is fitted with a heat exchange end plate A22 connected to the curved outer port of the heat exchange tube 21, and the other end is fitted with a heat exchange end plate B23 connected to the inner port of the heat exchange tube 21. A heat exchanger end cover 24 is installed on the outer side of the heat exchange end plate B23. A sealing gasket is placed between the heat exchanger end cover 24 and the heat exchange end plate B23 to fill the microscopic gaps at the connection surface, block the leakage path of the medium, adapt to dynamic operating condition changes, and ensure the sealing and reliability of the tube-side cavity. The outer side of the heat exchange tube 21, the heat exchanger shell 1, and the heat exchange end plate A22 form an independent closed space, allowing the shell-side medium to flow within this independent space. The heat exchange tube 21, the heat exchange end plate B23, and the heat exchange end cover 24 form another independent chamber, completely isolating the tube-side medium from the shell-side medium, thus preventing mixing and improving heat exchange efficiency.

[0028] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] 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 heat exchanger that avoids liquid mixing caused by poor manufacturing, comprising a heat exchanger shell (1), characterized in that: The heat exchanger shell (1) is provided with an assembly mechanism (2) to prevent media mixing and leakage. The assembly mechanism (2) includes a heat exchange tube (21) installed inside the heat exchanger housing (1). One end of the heat exchanger housing (1) is equipped with a heat exchange end plate A (22) connected to the bent outer port of the heat exchange tube (21). The other end of the heat exchanger housing (1) is equipped with a heat exchange end plate B (23) connected to the inner port of the heat exchange tube (21). A heat exchanger end cover (24) is installed on the outer side of the heat exchange end plate B (23).

2. A shell-and-tube heat exchanger according to claim 1 that avoids liquid mixing caused by manufacturing defects, characterized in that: The heat exchange tube (21) is an integrally formed U-shaped tube, and the heat exchange tube (21), the heat exchanger shell (1) and the heat exchange end plate A (22) form a sealed cavity.

3. A shell-and-tube heat exchanger according to claim 1 that avoids liquid mixing caused by manufacturing defects, characterized in that: The heat exchange end plate A (22) is connected to the heat exchanger shell (1) and the bent outer port of the heat exchange tube (21) by welding. The heat exchange end plate B (23) is also connected to the straight pipe section port inside the heat exchange tube (21) by welding.

4. A shell-and-tube heat exchanger according to claim 1 that avoids liquid mixing caused by manufacturing defects, characterized in that: The heat exchanger shell (1) is made entirely of 316L stainless steel, and the heat exchanger shell (1), heat exchange end plate B (23) and heat exchanger end cover (24) form an independent cavity.

5. A shell-and-tube heat exchanger according to claim 1 that avoids liquid mixing caused by manufacturing defects, characterized in that: The surface of the heat exchanger shell (1) is polished, and the design pressure of the heat exchange tube (21) is 3.0 MPa.

6. A shell-and-tube heat exchanger according to claim 1 that avoids liquid mixing caused by manufacturing defects, characterized in that: A baffle plate is installed on the heat exchanger shell (1), and a drain port is provided at the baffle plate. A sealing gasket is provided between the heat exchanger end cover (24) and the heat exchange end plate B (23).

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