Pipe head leakage plugging plug

Abstract

The invention relates to the technical field of heat exchange tube maintenance, in particular to a tube head leakage blocking plug which comprises a conical plug body in threaded connection with a heat exchange tube, a blocking rubber ring capable of sliding in a reciprocating mode is installed on the portion, located on the inner side of the heat exchange tube, of the conical plug body, and an inner side extrusion block is arranged on the inner side of the blocking rubber ring. A mounting plate used for pushing out the plugging rubber ring is arranged on the side, away from the heat exchange pipe, of the conical plug. Through the combined arrangement of the plugging rubber ring and the inner side extrusion block, the inner side extrusion block extrudes the plugging rubber ring, so that the plugging ring is expanded and is attached to the inner wall of the heat exchange tube, the primary sealing effect is achieved, secondary sealing is achieved through the combined use of the outer contour of the conical plug and the sealing ring, and the sealing effect is improved through the multi-sealing structure arrangement. A better sealing effect is achieved, the distance between the plugging rubber ring and the connecting end of the conical plug is controlled, it is guaranteed that an enough dynamic buffer area exists, impact force applied by high-pressure impact media is absorbed, and the anti-loosening service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of heat exchange tube maintenance technology, specifically to a tube head leak sealing plug. Background Technology

[0002] High-pressure threaded locking ring heat exchangers are core heat exchange equipment in petroleum refining, coal chemical, and nuclear power industries. Their core feature is the use of threaded locking rings to press the tube box and tube sheet together, achieving a seal between the heat exchange tubes and the shell side. When a single heat exchange tube fails due to corrosion, fatigue, or manufacturing defects, single-tube plugging technology is needed to maintain equipment operation and avoid the high cost of replacing the entire tube. Currently, the mainstream single-tube plugging solution adopts an "insertion plug + threaded / expansion joint + single sealing gasket" structure. Its working principle involves inserting the plug into the heat exchange tube, aligning it with a guide boss, and then tightening the thread to fix the plug to the tube sheet. The interference fit and the sealing gasket compress and fill the gap between the heat exchange tube and the plug, ultimately achieving isolation between the tube side and the shell side.

[0003] Traditional plugs use right-hand fine threads (the same direction of rotation as conventional bolts) and lack anti-loosening auxiliary structures. High-pressure media in the pipeline exerts an axial thrust on the plug's inner wall, which is converted into a clockwise rotational torque through the thread face (the same tightening direction as the right-hand thread). During long-term operation, vibration or thermal stress further amplifies this torque, causing the threads to gradually loosen. Experimental data shows that right-hand thread plugs, under 10MPa pressure and a 50℃ temperature difference cycle, loosen after only 50 cycles (preload torque attenuation ≥30%), ultimately leading to leakage.

[0004] Therefore, it is necessary to invent a pipe head leak sealing plug to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a pipe head leakage sealing plug, which optimizes the anti-loosening and anti-leakage effect by controlling the tightening method of the plug and the multi-stage sealing structure design.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A pipe head leakage sealing plug is provided, including a tapered plug that is threadedly connected to a heat exchange tube. A sealing rubber ring capable of reciprocating sliding is installed on the inner side of the tapered plug inside the heat exchange tube. An inner extrusion block capable of squeezing the sealing rubber ring from the inside out is provided on the inner side of the sealing rubber ring. A mounting plate for pushing out the sealing rubber ring is provided on the side of the tapered plug away from the heat exchange tube. A locking bolt for pushing out the inner extrusion block is installed in the middle of the mounting plate.

[0008] As a preferred embodiment of a pipe head leakage sealing plug, the outer wall of the sealing section of the conical plug is provided with a left-hand thread, a first sealing gasket is provided at the threaded end of the heat exchange tube and the conical plug, and a second sealing gasket is provided at the non-threaded end of the heat exchange tube and the conical plug.

[0009] As a preferred embodiment of a pipe leak sealing plug, a sleeve is slidably installed on the inner side of the conical plug, and a groove is formed on the inner side of the conical plug. A guide slider is provided on one side of the sleeve located in the groove and slides inside it. Multiple synchronous connecting rods are connected to the end face of the guide slider. The synchronous connecting rods pass through and extend to the outer side of the conical plug and form a fixed connection with the mounting plate.

[0010] As a preferred embodiment of a pipe head leakage sealing plug, the end face of the conical plug is provided with a receiving groove, and an installation block is fixedly installed at one end of the sleeve. The installation block and the sealing rubber ring form a detachable connection.

[0011] As a preferred embodiment of a pipe head leakage sealing plug, the outer side of the sleeve is provided with multiple annular grooves, and a sealing ring is installed in the annular grooves. The inner side of the conical plug is provided with multiple sealing ring retaining grooves that correspond to the positions of the annular grooves.

[0012] As a preferred embodiment of a pipe head leakage sealing plug, a push rod is slidably installed on the inner side of the sleeve. One end of the push rod located inside the heat exchange tube is detachably connected to the inner extrusion block. A positioning block is installed on the other end of the push rod. A rotating groove is opened on the inner side of the positioning block. An ejector block is fixedly installed on one end of the locking bolt located inside the conical plug. The ejector block rotates inside the rotating groove. A second groove for receiving the positioning block is opened on the inner side of the conical plug.

[0013] As a preferred embodiment of a pipe head leakage sealing plug, the inner side of the sealing rubber ring is hollow and has an extrusion slope. The extrusion slope contacts the inner extrusion block. The end face of the sealing rubber ring has multiple pressure relief grooves. The outer side of the sealing rubber ring has a sealing ring that can fit against the inner wall of the heat exchange tube.

[0014] As a preferred embodiment of a pipe leak sealing plug, the mounting plate has rectangular grooves on both sides, and a locking assembly is fixedly installed at the end of the conical plug. The locking assembly includes a limiting baffle, a locking threaded rod, a compression spring, a compression plate, and a locking nut. The limiting baffle and the compression plate are both rectangular and can pass through the rectangular grooves. The locking threaded rod is fixedly connected to the conical plug, and the limiting baffle and the compression plate are rotatably connected to the locking threaded rod. The compression spring is sleeved on the outside of the locking threaded rod and located between the limiting baffle and the compression plate. The locking nut is located on one side of the compression plate and is rotatably connected to the locking threaded rod.

[0015] As a preferred embodiment of a pipe head leakage sealing plug, the locking bolt has a threaded portion on the side near the mounting plate, which can form a threaded connection with the mounting plate.

[0016] As a preferred embodiment of a pipe head leakage sealing plug, the outer side of the conical plug is fitted with a tightening nut.

[0017] The beneficial effects of this invention are as follows: by setting multiple sealing gaskets, the shell-side metal spiral wound gasket bears the high-pressure main seal, and the tube-side fluororubber gasket fills the tiny gaps, thus reducing the leakage rate with double sealing. By changing the direction of the thread and counteracting the rotational torque of the high-pressure medium on the plug, the thread engagement is tighter. The spring washer and anti-loosening rubber in the thread section improve the anti-loosening life.

[0018] By combining the sealing rubber ring with the inner extrusion block, the inner extrusion block compresses the sealing rubber ring, causing the sealing ring to expand and fit against the inner wall of the heat exchange tube, achieving a primary sealing effect. The combination of the outer contour of the conical plug and the sealing ring achieves a secondary sealing effect. Through this multi-seal structure, a better sealing effect is achieved. The compression spring in the locking assembly limits the position of the mounting plate, controls the distance between the sealing rubber ring and the connection end of the conical plug, ensures sufficient dynamic buffer area, absorbs the impact force exerted by the high-pressure impact medium, and improves the anti-loosening life. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure described in this invention.

[0021] Figure 2 This is a schematic diagram of the overall half-section structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the half-section structure of the conical plug of the present invention in its contracted state.

[0023] Figure 4 This is a schematic diagram of the structure of the conical plug of the present invention in the extended state.

[0024] Figure 5 This is the present invention. Figure 4 Enlarged structural diagram at point A in the middle.

[0025] Figure 6 This is a schematic diagram of the sleeve position structure of the present invention.

[0026] Figure 7 This is a schematic diagram of the structure of the sealing rubber ring of the present invention under expanded state.

[0027] In the picture:

[0028] 1. Heat exchange tube; 2. Conical plug; 201. Receiving groove; 202. Slide groove one; 203. Slide groove two; 204. Sealing ring groove; 205. Left-hand thread; 4. Mounting plate; 401. Rectangular groove; 402. Synchronous connecting rod; 5. Sleeve; 501. Sealing ring; 502. Guide slider; 6. Push rod; 601. Positioning block; 602. Rotating slide groove; 7. Locking assembly; 701. Limiting baffle; 702. Locking threaded rod; 703. Compression spring; 704. Compression plate; 705. Locking nut; 8. Locking bolt; 801. Threaded part; 802. Ejector block; 9. Mounting block; 10. Sealing rubber ring; 1001. Pressure reducing groove; 1002. Sealing ring; 1003. Compression inclined surface; 11. Tightening nut; 12. Inner compression block. Detailed Implementation

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] refer to Figures 1 to 7 This invention provides a pipe-end leakage sealing plug, comprising a conical plug 2 threadedly connected to a heat exchange tube 1. A reciprocating sliding sealing rubber ring 10 is installed on the inner side of the conical plug 2 within the heat exchange tube 1. An inner pressing block 12, capable of squeezing the sealing rubber ring 10 from the inside out, is provided on the inner side of the conical plug 2 away from the heat exchange tube 1. A mounting plate 4 for pushing out the sealing rubber ring 10 is provided on the side of the conical plug 2 away from the heat exchange tube 1. A locking bolt 8 for pushing out the inner pressing block 12 is installed in the middle of the mounting plate 4. The conical plug 2 is an axisymmetric cylinder, divided into three sections along the axial direction: a tube-side conical sealing section, a transition connection section, and a shell-side threaded sealing section. The tube-side conical sealing section has an outer wall machined into a conical surface with a taper of 1:50 to 1:100. The root of the conical surface smoothly transitions to the transition connection section. Initial sealing is achieved through the interference fit (0.1 to 0.3 mm) between the conical surface and the heat exchange tube 1 port, and it also provides guidance for subsequent threaded connections, reducing insertion resistance. The shell-side threaded sealing section (near the tube sheet end) has a concentric reverse thread machined on its outer wall (i.e., the thread direction is opposite to the conventional right-hand thread, using a left-hand thread 205). The thread type is a fine-pitch triangular thread (pitch P = 1.5 to 2.5 mm, preferably 2 mm), and the thread length is the tube sheet thickness + 5 to 10 mm (to ensure full engagement with the tube sheet threaded hole). The concentric reverse thread ensures that the thread side is evenly stressed when tightened, and the left-hand direction can counteract the clockwise rotational torque of the high-pressure medium on the plug (conventional right-hand threads are prone to loosening under high pressure due to the medium thrust), significantly improving the anti-loosening performance.

[0034] The outer wall of the sealing section of the conical plug 2 is provided with a left-hand thread 205. A first sealing gasket is provided at the threaded end of the heat exchange tube 1 and the conical plug 2, and a second sealing gasket is provided at the non-threaded end of the heat exchange tube 1 and the conical plug 2. The advantage of the left-hand thread 205 is that the shell-side threaded sealing section uses a left-hand fine thread (2mm pitch), which is opposite to the tightening direction of the traditional right-hand thread. When the high-pressure medium in the tube side generates an axial thrust on the inner wall of the plug (F=P⋅A, where P is the tube-side pressure and A is the inner cross-sectional area of ​​the plug), this thrust is converted into a counterclockwise rotational torque through the thread surface (consistent with the tightening direction of the left-hand thread 205). At this time, the tightening torque of the left-hand thread 205 is in the same direction as the rotational torque generated by the medium thrust, which further tightens the thread (the traditional right-hand thread is in the opposite direction, leading to loosening).

[0035] The outer wall of the conical sealing section of the tube side is machined with a conical surface of 1:50 to 1:100 (preferably 1:80), and the length of the conical surface is 1 / 4 to 1 / 3 of the effective length of the heat exchange tube 1 (e.g., 150 to 200 mm). When inserting the heat exchange tube 1, the conical surface serves as a guide surface. Even if there is a slight deviation during operation (angle deviation ≤2°), it can be quickly aligned through the adaptive adjustment of the conical surface (the eccentricity is reduced from the traditional 0.5 mm to within 0.1 mm), avoiding the repeated adjustment problems caused by the difficulty in alignment of traditional short guide bosses (length 5 to 10 mm, taper 1:20 to 1:30).

[0036] After the plug is connected to heat exchanger tube 1 / tube sheet, zero leakage under high pressure conditions is achieved through layered sealing of the tube-side fluororubber gasket and the shell-side spiral wound gasket.

[0037] The main seal on the shell side is a 316L stainless steel + flexible graphite spiral wound gasket (4mm width, 18% compression ratio) placed between the shell-side threaded sealing section and the tube sheet. When the plug is tightened, the thread provides axial force (calculated as: F_axial = K⋅T / dm, where K is the torque coefficient, T is the preload torque, and dm is the thread pitch diameter), pushing the spiral wound gasket to compress radially, forming a metal-nonmetal line contact seal (contact width 1.5~2mm) with the shell-side sealing surface of the tube sheet. This seal can withstand the direct impact of high-pressure media (15MPa), and the plastic deformation characteristics of the flexible graphite fill the micro-pits (such as machining marks) on the sealing surface, ensuring the reliability of the main seal.

[0038] Secondary sealing of the tube-side fluororubber gasket: A fluororubber (FKM) gasket (groove depth 0.8mm, width 2.5mm) is embedded between the conical sealing section of the tube-side and heat exchange tube 1. Under the interference compression of the conical sealing section, the fluororubber gasket undergoes elastic deformation (compression rate 25%), filling the minor defects at the port of heat exchange tube 1 (such as burrs, scratches, or gaps caused by conical surface machining errors), forming an elastic seal. The temperature resistance (-20~250℃) and chemical resistance (resistance to oil and gas corrosion) of fluororubber ensure that it does not harden or crack under high pressure and alternating temperatures, further preventing leakage of the tube-side medium as a secondary seal (leakage rate ≤0.05mL / h).

[0039] A sleeve 5 is slidably installed on the inner side of the conical plug 2. A groove 202 is formed on the inner side of the conical plug 2. A guide slider 502 is provided on one side of the sleeve 5, which slides inside the groove 202. Multiple synchronous connecting rods 402 are connected to the end face of the guide slider 502. The synchronous connecting rods 402 pass through and extend to the outer side of the conical plug 2, and are fixedly connected to the mounting plate 4. By sliding the sleeve 5, the position of the sealing rubber ring 10 can be adjusted. By controlling the gap between the sealing rubber ring 10 and the conical plug 2, the connection of the conical plug 2 can be prevented from being impacted by high-pressure medium, thus preventing the connection from loosening due to impact and preventing seal failure.

[0040] The tapered plug 2 has a receiving groove 201 on its end face, and an mounting block 9 is fixedly installed at one end of the sleeve 5. The mounting block 9 and the sealing rubber ring 10 are detachably connected. The receiving groove 201 is used to store the mounting block 9. The detachable connection allows for timely replacement of damaged sealing rubber rings 10.

[0041] The outer surface of the sleeve 5 has multiple annular grooves, and a sealing ring 501 is installed in each annular groove. The inner side of the conical plug 2 has multiple sealing ring slots 204 that correspond to the positions of the annular grooves. By pressing the mounting plate 4, the guide slider 502 slides towards the side where the heat exchange tube 1 is located, and the sealing ring 501 moves to the inner side of the sealing ring slot 204 to seal the gap on the side where the sleeve 5 is located. Multiple sealing rings 501 are provided to ensure the sealing effect.

[0042] A push rod 6 is slidably installed on the inner side of the sleeve 5. One end of the push rod 6 located inside the heat exchange tube 1 is detachably connected to the inner extrusion block 12. A positioning block 601 is installed on the other end of the push rod 6. A rotating groove 602 is provided on the inner side of the positioning block 601. An ejector block 802 is fixedly installed on one end of the locking bolt 8 located inside the conical plug 2. The ejector block 802 rotates inside the rotating groove 602. A second groove 203 for receiving the positioning block 601 is provided on the inner side of the conical plug 2. The locking bolt 8 is threadedly connected to the mounting plate 4, which can drive the push rod 6 to slide towards the side where the heat exchange tube 1 is located. The push block 802 at the end of the locking bolt 8 is located inside the rotating groove 602 and can rotate, so that the rotation of the locking bolt 8 is converted into the pushing of the push rod 6, ensuring the compression between the sealing rubber ring 10 and the inner extrusion block 12, and avoiding damage to the contact surface between the sealing rubber ring 10 and the inner extrusion block 12 due to the rotation of the push rod 6, which would affect the sealing effect.

[0043] The sealing rubber ring 10 has a hollow inner side with a compression bevel 1003. The compression bevel 1003 contacts the inner compression block 12. Multiple pressure-reducing grooves 1001 are formed on the end face of the sealing rubber ring 10. A sealing ring 1002, capable of fitting against the inner wall of the heat exchange tube 1, is formed on the outer side of the sealing rubber ring 10. The pressure-reducing grooves 1001 reduce the thickness of the end face of the sealing rubber ring 10, making it easier for the sealing ring 1002 to expand outwards. When the sealing rubber ring 10 expands outwards under compression, the end of the inner compression block 12 presses against the compression bevel 1003, resulting in a tight seal and achieving a sealing effect.

[0044] The mounting plate 4 has rectangular slots 401 on both sides. The end of the conical plug 2 is fixedly installed with a locking assembly 7. The locking assembly 7 includes a limiting baffle 701, a locking threaded rod 702, a compression spring 703, a compression plate 704, and a locking nut 705. The limiting baffle 701 and the compression plate 704 are both rectangular and can pass through the rectangular slots 401. The locking threaded rod 702 is fixedly connected to the conical plug 2. The limiting baffle 701 and the compression plate 704 are rotatably connected to the locking threaded rod 702. The compression spring 703 is sleeved on the outside of the locking threaded rod 702 and is located between the limiting baffle 701 and the compression plate 704. The locking nut 705 is located on one side of the compression plate 704 and is rotatably connected to the locking threaded rod 702.

[0045] The position of the extrusion plate 704 is fixed by locking the nut 705, the limit baffle 701 is rotated, and the elastic force is applied to the limit baffle 701 by locking the nut 705 to constrain the position of the mounting plate 4. By adjusting the position of the extrusion plate 704, the magnitude of the elastic force applied to the limit baffle 701 is controlled, thereby improving the impact resistance of the plug.

[0046] The locking bolt 8 has a threaded portion 801 on the side near the mounting plate 4, which can form a threaded connection with the mounting plate 4. When the threaded portion 801 forms a threaded connection with the mounting plate 4, the outer end face of the inner pressing block 12 presses against the pressing slope 1003 of the sealing rubber ring 10. Under the pressure of the inner pressing block 12, the sealing ring 1002 expands and presses outward, fitting against the inner wall of the heat exchange tube 1, achieving a sealing effect. When the threaded portion 801 forms a threaded connection with both the mounting plate 4 and the conical plug 2, it can further lock the position of the mounting plate 4, preventing the sleeve 5 from slipping when impacted, and improving the stability of the sealing effect. When the threaded part 801 forms a threaded connection with the mounting plate 4 and is separated from the conical plug 2, when the high-pressure medium impacts the sealing rubber ring 10, the compression spring 703 can absorb the impact force applied by the high-pressure medium, and after the impact force dissipates, restore the position of the sealing rubber ring 10 to perform dynamic compensation and reduce the impact force on the conical plug 2.

[0047] A tightening nut 11 is fitted on the outer side of the conical plug 2. The tightening nut 11 facilitates the screwing in of the left-hand thread 205.

[0048] This invention, by setting multiple sealing gaskets, uses a shell-side metal spiral wound gasket to withstand high-pressure main sealing and a tube-side fluororubber gasket to fill tiny gaps, thus reducing leakage rate with double sealing. By changing the direction of the thread and counteracting the rotational torque of the high-pressure medium on the plug, the thread engagement is tighter. The spring washers and anti-loosening rubber in the thread section further enhance the anti-loosening life.

[0049] By combining the sealing rubber ring 10 with the inner extrusion block 12, the inner extrusion block 12 extrudes the sealing rubber ring 10, causing the sealing ring 1002 to expand and fit against the inner wall of the heat exchange tube 1, achieving a primary sealing effect. The secondary sealing is achieved by combining the outer contour of the conical plug 2 with the sealing ring 501. Through the structure of multiple sealing, a better sealing effect is achieved. The compression spring 703 in the locking assembly 7 can limit the position of the mounting plate 4, control the distance between the sealing rubber ring 10 and the connection end of the conical plug 2, ensure sufficient dynamic buffer area, absorb the impact force applied by the high-pressure impact medium, and improve the anti-loosening life.

[0050] It should be stated that the above-described specific embodiments are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to the present invention. However, such variations, as long as they do not depart from the spirit of the present invention, should be within the scope of protection of the present invention. Furthermore, some terminology used in this specification and claims is not limiting, but merely for ease of description.

Claims

1. A pipe head leakage sealing plug, characterized in that: The device includes a tapered plug (2) that forms a threaded connection with the heat exchange tube (1). The tapered plug (2) is located inside the heat exchange tube (1) and is equipped with a reciprocating sliding sealing rubber ring (10). The sealing rubber ring (10) is provided with an inner pressing block (12) that can press the sealing rubber ring (10) from the inside out. The tapered plug (2) is provided with a mounting plate (4) for pushing out the sealing rubber ring (10) on the side away from the heat exchange tube (1). The mounting plate (4) is equipped with a locking bolt (8) for pushing out the inner pressing block (12) in the middle.

2. The pipe head leakage sealing plug according to claim 1, characterized in that: The outer wall of the sealing section of the conical plug (2) is provided with a left-hand thread (205), the threaded ends of the heat exchange tube (1) and the conical plug (2) are provided with a first sealing gasket, and the non-threaded ends of the heat exchange tube (1) and the conical plug (2) are provided with a second sealing gasket.

3. The pipe head leakage sealing plug according to claim 1, characterized in that: A sleeve (5) is slidably installed on the inner side of the conical plug (2). A groove (202) is provided on the inner side of the conical plug (2). A guide slider (502) is provided on one side of the groove (202) and slides inside it. Multiple synchronous connecting rods (402) are connected to the end face of the guide slider (502). The synchronous connecting rods (402) pass through and extend to the outer side of the conical plug (2) and are fixedly connected with the mounting plate (4).

4. A pipe head leakage sealing plug according to claim 3, characterized in that: The tapered plug (2) has a receiving groove (201) on its end face, and an installation block (9) is fixedly installed on one end of the sleeve (5). The installation block (9) and the sealing rubber ring (10) form a detachable connection.

5. A pipe head leakage sealing plug according to claim 3, characterized in that: The outer side of the sleeve (5) is provided with multiple annular grooves, and a sealing ring (501) is installed in the annular groove. The inner side of the conical plug (2) is provided with multiple sealing ring slots (204) that correspond to the positions of the annular grooves.

6. A pipe head leakage sealing plug according to claim 2, characterized in that: A push rod (6) is slidably installed on the inner side of the sleeve (5). One end of the push rod (6) located inside the heat exchange tube (1) is detachably connected to the inner extrusion block (12). A positioning block (601) is installed on the other end of the push rod (6). A rotating groove (602) is opened on the inner side of the positioning block (601). An ejector block (802) is fixedly installed on one end of the locking bolt (8) located inside the conical plug (2). The ejector block (802) rotates inside the rotating groove (602). A second groove (203) for receiving the positioning block (601) is opened on the inner side of the conical plug (2).

7. A pipe head leakage sealing plug according to claim 6, characterized in that: The inner side of the sealing rubber ring (10) is hollow and has an extrusion slope (1003) on the inner side. The extrusion slope (1003) is in contact with the inner extrusion block (12). The end face of the sealing rubber ring (10) is provided with multiple pressure relief grooves (1001). The outer side of the sealing rubber ring (10) is provided with a sealing ring (1002) that can fit against the inner wall of the heat exchange tube (1).

8. A pipe head leakage sealing plug according to claim 3, characterized in that: The mounting plate (4) has rectangular slots (401) on both sides. A locking assembly (7) is fixedly installed at the end of the conical plug (2). The locking assembly (7) includes a limiting baffle (701), a locking threaded rod (702), a compression spring (703), a compression plate (704), and a locking nut (705). The limiting baffle (701) and the compression plate (704) are both rectangular and can pass through the rectangular slots (401). The locking threaded rod... The rod (702) is fixedly connected to the conical plug (2). The limiting baffle (701) and the extrusion plate (704) are both rotatably connected to the locking thread rod (702). The extrusion spring (703) is sleeved on the outside of the locking thread rod (702) and is located between the limiting baffle (701) and the extrusion plate (704). The locking nut (705) is located on one side of the extrusion plate (704) and is rotatably connected to the locking thread rod (702).

9. A pipe head leakage sealing plug according to claim 8, characterized in that: The locking bolt (8) has a threaded part (801) on the side near the mounting plate (4), and the threaded part (801) can form a threaded connection with the mounting plate (4).

10. A pipe head leakage sealing plug according to claim 1, characterized in that: The tapered plug (2) is fitted with a tightening nut (11) on its outer side.

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