Internal expansion type heat exchange tube plugging device of heat exchanger

Abstract

A plugging device for an internal expansion type heat exchange tube of a heat exchanger comprises a sealing body, a rubber pad, a positioning ring and a locking nut. The sealing body comprises a column section, an extrusion section coaxially connected with one end of the column section and a threaded section coaxially connected with the other end of the column section. The rubber pad is annular, is arranged on the periphery of the column section in a sleeving manner and can move in the axial direction relative to the sealing body; the positioning ring comprises an extrusion part and a positioning part; the extrusion part sleeves the periphery of the threaded section and can move in the axial direction relative to the sealing body; the positioning part is arranged at one end, far away from the rubber pad, of the extrusion part; the outer diameter of the positioning part is larger than that of the extrusion part; the locking nut is arranged on the outer side of the positioning part and is in threaded connection with the threaded section. The quick plugging device can be directly inserted into the ports at the two ends of the damaged heat exchange tube to expand the inner wall of the heat exchange tube, so that the two ends of the heat exchange tube are quickly plugged. Complicated welding or large-scale dismounting operation is not needed, the leakage problem of the heat exchange tube is rapidly solved, and production continuity and economic benefits are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to an internal expansion type heat exchange tube plugging device for a heat exchanger. Background Art

[0002] Heat exchangers are widely used equipment in industrial production. They are mainly composed of tube sheets and a large number of arranged heat exchange tubes. The two ends of the heat exchange tubes are welded to the openings on the tube sheets, and the medium flows in the heat exchange tubes and performs heat exchange. In actual operation, due to corrosion, freezing cracking and other reasons, the heat exchange tubes will inevitably be damaged, leaked and other problems. At present, for the leakage problem of heat exchange tubes in heat exchangers, the common solution is to repair or replace the damaged heat exchange tubes. This method cannot be implemented on site due to the close arrangement of the heat exchange tubes. The heat exchanger needs to be disassembled and welded, which not only has a long maintenance cycle, but also has a great impact on production. Another method is to isolate the leaking heat exchange tube, that is, to seal the two ends of the heat exchange tube to cut off the flow of the medium, thereby avoiding leakage. However, most of the existing heat exchange tube isolation methods require welding at the ends of the heat exchange tubes, which is complicated to operate, time-consuming, and inconvenient for on-site use. Utility Model Content

[0003] The utility model is to overcome the shortcomings of the prior art and provide a heat exchanger internal expansion type heat exchange tube plugging device, which can be directly inserted into the ports at both ends of the damaged heat exchange tube, and by tightening the locking nut, the rubber pad and the metal pad are compressed and expanded along the axial direction, and the inner wall of the heat exchange tube is expanded, thereby realizing the rapid plugging of the ends of the heat exchange tube. No complicated welding or large-scale disassembly operation is required, which greatly simplifies the operation process and reduces the maintenance time. It is suitable for quickly handling the leakage problem of the heat exchange tube in various industrial applications, and ensuring the continuity of production and economic benefits.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a heat exchanger internal expansion type heat exchange tube plugging device, comprising: a sealing body, a rubber pad, a positioning ring and a locking nut; wherein the sealing body comprises a column section, an extrusion section coaxially connected to one end of the column section, and a threaded section coaxially connected to the other end of the column section; the rubber pad is annular, sleeved on the outer periphery of the column section, and can move relative to the sealing body along its axial direction; the positioning ring comprises an extrusion part sleeved on the outer periphery of the threaded section and can move relative to the sealing body along its axial direction, and a positioning part arranged at one end of the extrusion part away from the rubber pad, the outer diameter of the positioning part is larger than the outer diameter of the extrusion part and is integrally formed with the extrusion part; the locking nut is arranged on the outer side of the positioning part and is threadedly connected to the threaded section.

[0005] The outer end surface of the threaded section is provided with a L-shaped opening groove.

[0006] The outer periphery of the column section is sleeved with an annular metal pad which can move relative to the sealing body along its axial direction; the rubber pads are arranged in an even number and are evenly arranged on both sides of the metal pad.

[0007] The extrusion section is in a truncated cone shape, and its large diameter end is coaxially connected with the column section.

[0008] Working principle: When in use, the sealing body together with the rubber pad, metal pad and the extrusion part of the positioning ring is inserted into the heat exchange tube from the port of the damaged heat exchange tube. The positioning part of the positioning ring can be against the end face of the heat exchange tube to position the positioning ring and the locking nut to prevent the positioning ring and the locking nut from entering the interior of the heat exchange tube. By tightening the locking nut, the extrusion section on the sealing body drives the rubber pad and the metal pad to move toward the extrusion part of the positioning ring along its axial direction. The open groove on the threaded section can be inserted with a screwdriver or other tool to limit the threaded section with the tool to prevent the sealing body from rotating with the nut when the nut is tightened. The relative movement of the extrusion section and the extrusion part can compress and expand the rubber pad along the axial direction, so as to closely contact the inner wall of the heat exchange tube and the inner side of the extrusion section to form a reliable seal. The metal pad can provide hard support for the soft seal of the rubber pad, ensuring that a good sealing effect can be maintained under different working conditions of the heat exchange tube, thereby achieving rapid sealing of the heat exchange tube and preventing medium leakage.

[0009] The beneficial effect of the utility model is that the utility model has a simple structure and is easy to operate. It can be directly inserted into the ports at both ends of the damaged heat exchange tube. By tightening the locking nut, the rubber pad and the metal pad are compressed and expanded along the axial direction, and the inner wall of the heat exchange tube is expanded, thereby realizing rapid plugging of the ends of the heat exchange tube. No complicated welding or large-scale disassembly operations are required, which greatly simplifies the operation process and reduces the maintenance time. It is suitable for quickly handling leakage problems of heat exchange tubes in various industrial applications to ensure production continuity and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the exploded structure of the general assembly of the utility model;

[0011] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0012] In the figure: sealing body 3, column section 3-1, extrusion section 3-2, threaded section 3-3, open groove 3-4, rubber pad 4, positioning ring 5, extrusion part 5-1, positioning part 5-2, locking nut 6, metal pad 7. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0014] like Figure 1 , Figure 2As shown, in the prior art, both ends of the heat exchange tube 2 of the heat exchanger are welded to the openings on the tube sheet 1. In order to quickly seal the leaking heat exchange tube 2, the utility model provides a heat exchanger internal expansion type heat exchange tube sealing device, including: a sealing body 3, a rubber pad 4, a positioning ring 5 and a locking nut 6; wherein the sealing body 3 includes a column section 3-1, an extrusion section 3-2 coaxially connected to one end of the column section 3-1, and a threaded section 3-3 coaxially connected to the other end of the column section 3-1; the rubber pad 4 is a ring shaped, sleeved on the outer periphery of the column section 3-1, and capable of moving relative to the sealing body 3 along its axial direction; the positioning ring 5 includes an extrusion portion 5-1 sleeved on the outer periphery of the threaded section 3-3 and capable of moving relative to the sealing body 3 along its axial direction, and a positioning portion 5-2 arranged at one end of the extrusion portion away from the rubber pad 4, the outer diameter of the positioning portion 5-2 is greater than the outer diameter of the extrusion portion 5-1 and is integrally formed with the extrusion portion 5-1; the locking nut 6 is arranged on the outer side of the positioning portion 5-2 and is threadedly connected to the threaded section 3-3.

[0015] The outer end surface of the threaded section 3-3 is provided with a straight opening groove 3-4.

[0016] The outer periphery of the column section 3 - 1 is sleeved with an annular metal pad 7 which can move relative to the sealing body 3 along its axial direction; the rubber pads 4 are arranged in an even number and are evenly arranged on both sides of the metal pad 7 .

[0017] The extrusion section 3-2 is in the shape of a truncated cone, and its large diameter end is coaxially connected to the column section 3-1.

[0018] When in use, the sealing body 3 together with the rubber pad 4, the metal pad 7 and the extrusion portion 5-1 of the positioning ring 5 are inserted into the heat exchange tube from the port of the damaged heat exchange tube. The positioning portion 5-2 of the positioning ring 5 can be against the end surface of the heat exchange tube to position the positioning ring 5 and the locking nut 6 to prevent the positioning ring 5 and the locking nut 6 from entering the interior of the heat exchange tube. By tightening the locking nut 6, the extrusion section 3-2 on the sealing body 3 drives the rubber pad 4 and the metal pad 7 to move toward the extrusion portion 5-1 of the positioning ring 5 along the axial direction thereof, and the open groove 3-3 on the threaded section 3-3 is 4 can be inserted with a tool such as a screwdriver to limit the threaded section 3-3 with the tool to prevent the sealing body 3 from rotating with the nut when the nut is tightened. The extrusion section 3-2 and the extrusion portion 5-1 move toward each other so that the rubber pad 4 can be compressed and expanded along the axial direction, thereby closely contacting with the inner wall of the heat exchange tube and the inner side surface of the extrusion section 3-2 to form a reliable seal. The metal pad 7 can provide hard support for the soft seal of the rubber pad 4, ensuring that a good sealing effect can be maintained under different working conditions of the heat exchange tube, thereby realizing rapid sealing of the heat exchange tube and preventing medium leakage.

Claims

1. A heat exchanger internal expansion type heat exchange tube plugging device, comprising: A sealing body (3), a rubber pad (4), a positioning ring (5) and a locking nut (6); characterized in that: the sealing body (3) comprises a column section (3-1), an extrusion section (3-2) coaxially connected to one end of the column section (3-1), and a threaded section (3-3) coaxially connected to the other end of the column section (3-1); the rubber pad (4) is annular, sleeved on the outer periphery of the column section (3-1), and can move relative to the sealing body (3) along its axial direction; the positioning ring (5) comprises an extrusion portion (5-1) sleeved on the outer periphery of the threaded section (3-3) and can move relative to the sealing body (3) along its axial direction, and a positioning portion (5-2) arranged at one end of the extrusion portion (5-1) away from the rubber pad (4), the outer diameter of the positioning portion (5-2) being greater than the outer diameter of the extrusion portion (5-1) and being integrally formed with the extrusion portion (5-1); and the locking nut (6) is arranged on the outer side of the positioning portion (5-2) and is threadedly connected to the threaded section (3-3).

2. The heat exchanger internal expansion type heat exchange tube plugging device according to claim 1, characterized in that: The outer end surface of the threaded section (3-3) is provided with a straight-line opening groove (3-4).

3. The heat exchanger internal expansion type heat exchange tube plugging device according to claim 1, characterized in that: The outer periphery of the column section (3-1) is sleeved with an annular metal pad (7) that can move relative to the sealing body (3) along its axial direction; the rubber pads (4) are arranged in an even number and are evenly distributed on both sides of the metal pad (7).

4. The heat exchanger internal expansion type heat exchange tube plugging device according to claim 1, characterized in that: The extrusion section (3-2) is in the shape of a truncated cone, and its large diameter end is coaxially connected to the column section (3-1).

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