A sealing plug for heat exchanger tubes

Abstract

The utility model relates to the technical field of end cap, specifically relates to a sealed end cap for heat exchanger pipe, include: intermediate section, be cylindrical, top section, be conical, one end of larger diameter is fixed on the intermediate section, tail section, be conical, one end of smaller diameter is fixed on the intermediate section and the slot, set up on the intermediate section, internally cover and set up the sealing ring, the utility model has the beneficial effects that: through the interference fit of intermediate section, the elastic sealing of sealing ring and the taper surface compression effect of tail section, constitute triple sealing structure, significantly improve the anti -leakage capacity of end cap.

Description

Technical Field

[0001] This utility model relates to the field of plug technology, specifically to a sealing plug for heat exchanger tubes. Background Technology

[0002] Heat exchangers, as core equipment in process industries such as petrochemicals, energy and power, and metallurgy, play a vital role in heat exchange. Their operational stability directly affects the safety and economy of the entire production unit. With the increasing demands for long-term operation in modern industry, the continuous operating cycle of large-scale production units typically reaches 3-5 years, or even longer. However, during long-term operation, heat exchanger tubes are susceptible to thinning, perforation, and even breakage due to media corrosion, scaling, mechanical vibration, alternating stress, and high-temperature, high-pressure conditions, leading to media leakage. Statistics show that in the petrochemical industry, tube leakage accounts for more than 60% of all heat exchanger failures. A single heat exchanger leak can reduce the unit's processing capacity by 10%-30%, while also causing a series of problems such as cross-contamination of process media, increased energy consumption, safety hazards, and exceeding environmental emission standards.

[0003] Currently, conical plugs are commonly used in the industry to seal leaking pipes. However, traditional conical plugs have the following technical defects: (1) The plug and the pipe wall only rely on the conical surface to fit, resulting in a limited contact area and insufficient sealing pressure, making them prone to loosening under medium pressure or vibration; (2) After installation, the plug lacks a secondary sealing mechanism and cannot adapt to dimensional changes in the pipe wall caused by corrosion or wear, resulting in poor long-term sealing reliability. These problems make traditional plugs have a high failure rate in high-pressure, strong vibration, or corrosive media environments. Frequent repeated plugging not only increases maintenance costs but may also lead to unplanned shutdowns due to sudden leaks, causing significant economic losses.

[0004] Therefore, a sealing plug for heat exchanger tubes is needed to overcome the above problems. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a sealing plug for heat exchanger tubes, thus achieving the goal of solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a sealing plug for heat exchanger tubes, comprising: a middle section, which is cylindrical; a top section, which is conical, with one end of a larger diameter fixed to the middle section; a tail section, which is conical, with one end of a smaller diameter fixed to the middle section; and a groove, which is disposed on the middle section and has a sealing ring sleeved inside.

[0007] As a further improvement to the above technical solution:

[0008] The tail section includes: a tail body, which is fixedly connected to one end of the middle section, and a cover layer, which is fixedly connected to one end of the middle section and fitted over the outside of the tail body.

[0009] The tail section further includes a groove disposed between the tail body and the cover layer; a locking block is disposed inside the groove.

[0010] The groove is inserted inside the middle section.

[0011] The beneficial effects of this utility model embodiment are as follows:

[0012] The triple sealing structure is formed by the interference fit of the middle section, the elastic sealing of the sealing ring, and the conical pressing action of the tail section, which significantly improves the plug's anti-leakage capability.

[0013] Once the plug is in place, the retaining block is inserted along the groove, causing radial expansion of the middle section and further enhancing the contact pressure between the plug and the tube. This design not only improves sealing reliability but also effectively resists the risk of loosening caused by media pressure fluctuations and mechanical vibrations, making it particularly suitable for long-term sealing requirements under high temperature, high pressure, and highly corrosive conditions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0015] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0016] Figure 3 This is a reference diagram showing the usage state of Embodiment 2 of this utility model.

[0017] In the diagram: 1. Middle section; 2. Top section; 3. Tail section; 4. Groove; 5. Sealing ring;

[0018] 31. Tail body; 32. Covering layer; 33. Groove; 34. Locking block. Detailed Implementation

[0019] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0020] Example 1:

[0021] See Figure 1This utility model discloses a sealing plug for heat exchanger tubes, comprising a middle section 1, a top section 2, a tail section 3, and a groove 4 disposed on the middle section 1, with a sealing ring 5 fitted inside the groove 4. The middle section 1 is cylindrical, with a diameter slightly larger than the inner diameter of the heat exchanger tubes to achieve a preliminary interference fit seal. The top section 2 has a conical structure, with its larger diameter end fixedly connected to the top of the middle section 1 to guide the plug into the tubes smoothly. The tail section 3 is also conical, with its smaller diameter end fixedly connected to the tail end of the middle section 1 to form a radial compression seal on the tube ends. Through the interference fit of the middle section 1, the elastic seal of the sealing ring 5, and the conical compression of the tail section 3, a triple sealing structure is formed, significantly improving the plug's anti-leakage capability.

[0022] Example 2:

[0023] See Figure 2-3 The tail section 3 further includes a tail body 31 and a cover layer 32. The tail body 31 is fixedly connected to the tail end of the intermediate section 1, and the cover layer 32 is fitted over the tail body 31 and fixedly connected to the intermediate section 1. During installation, the plug is first pressed into the tube, and then the cover layer 32 is folded over to cover the outer wall of the tube end, forming an external sealing layer. An annular groove 33 is provided between the tail body 31 and the cover layer 32. The groove 33 extends into the interior of the intermediate section 1 and is fitted with a retaining block 34. After the plug is in place, the retaining block 34 is inserted along the groove 33, causing the intermediate section 1 to expand radially, further enhancing the contact pressure between the plug and the tube. This design not only improves the sealing reliability but also effectively resists the risk of loosening caused by medium pressure fluctuations and mechanical vibrations, making it particularly suitable for long-term sealing requirements under high temperature, high pressure, and strong corrosive conditions.

[0024] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0027] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A sealing plug for heat exchanger tubes, characterized in that include: The middle section (1) is cylindrical. The top section (2) is conical, with the larger diameter end fixed to the middle section (1). The tail section (3) is conical, with one end of smaller diameter fixed to the middle section (1) and a groove (4) set on the middle section (1), with a sealing ring (5) inside.

2. The seal plug for heat exchanger tubes according to claim 1, characterized in that The tail section (3) includes: The tail section (31) is fixedly connected to one end of the middle section (1), and The cover layer (32) is fixedly connected to one end of the middle section (1) and fitted onto the outside of the tail body (31).

3. The seal plug for heat exchanger tubes according to claim 2, characterized in that The tail section (3) also includes: A groove (33) is provided between the tail body (31) and the cover layer (32); A locking block (34) is provided inside the groove (33).

4. The seal plug for heat exchanger tubes according to claim 3, characterized in that The groove (33) is inserted inside the middle section (1).

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