Cooling wall water pipe sealing device and sealing method

Abstract

The present invention relates to a cooling wall water pipe sealing device and a sealing method, wherein the cooling wall water pipe sealing device includes a sealing ring, a second sealing body and a first sealing body; the rear end of the first sealing body is seal-welded to the pipe mouth of the cooling wall water inlet pipe, and the front end outer wall of the first sealing body is provided with an external thread section; the second sealing body includes a second sealing cylinder coaxially arranged with the first sealing cylinder, and a connecting cylinder sleeved and fixed on the outside of the second sealing cylinder, the sealing ring is located between the first sealing cylinder and the second sealing cylinder, and the two end faces of the sealing ring are in sealing contact with the first sealing cylinder and the second sealing cylinder respectively. The present invention improves the adaptability to the waveform of the corrugated pipe by clamping the sealing ring in the trough of the corrugated pipe, thereby improving the fit between the corrugated pipe and the sealing ring and ensuring the sealing effect; the end of the second sealing cylinder is connected to the cooling water supply pipe, which greatly improves the convenience of connection and ensures that the cooling water flows into the water inlet end of the corrugated pipe through the inner hole of the second sealing cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace cooling staves, in particular to the repair and sealing of ruptured cooling stave water pipes, and specifically to a cooling stave water pipe sealing device and a sealing method. Background Art

[0002] The cooling stave is an essential cooling device in blast furnaces. Water pipes are installed within the cooling stave, allowing cooling water to flow along the pipes, thereby achieving heat exchange with the cooling stave. Due to the high external temperature and internal corrosion, the cooling stave pipes may rupture and leak after a period of use. This can lead to cooling failure, causing localized high-temperature shedding and shortening the life of the furnace. Therefore, ruptured cooling stave pipes must be promptly addressed.

[0003] At present, there are two main ways to deal with cooling walls that fail to cool due to ruptured water pipes. One is to replace the cooling wall, which is costly and time-consuming. The other is to insert a bellows into the ruptured cooling wall water pipe to allow cooling water to flow in the bellows, and use the thermal conductivity of the bellows to exchange heat between the cooling water and the cooling wall. However, due to the wavy characteristics of the bellows, the connection between the bellows and the cooling water supply pipe is difficult to seal. Therefore, construction workers usually use pipe clamps to tighten and seal the bellows and the cooling water supply pipe. However, due to the high external ambient temperature, the pipe clamps will be stretched and deformed in a short period of time, resulting in poor sealing. Workers need to frequently replace the pipe clamps, which takes up a lot of manpower. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a cooling wall water pipe sealing device and a sealing method, which improve the sealing reliability of the bellows connection and avoid the high frequency replacement of pipe clamps.

[0005] The present invention is achieved through the following technical solutions, providing a cooling stave water pipe sealing device, comprising a sealing ring, a second sealing body, and a first sealing body sleeved on a bellows, the bellows passing through the cooling stave water pipe, the first sealing body being located at the end of the bellows passing through the cooling stave water pipe;

[0006] The rear end of the first sealing body is seal-welded to the pipe mouth of the cooling wall water pipe, and the front end outer wall of the first sealing body is provided with an external thread section, and a buffer chamber is formed inside the external thread section. A first sealing cylinder coaxial with the external thread section and integral with the first sealing body is provided in the buffer chamber, the inner hole diameter of the first sealing cylinder is adapted to the outer diameter of the bellows, and the inner hole of the first sealing cylinder axially passes through the first sealing body, and a first annular chamber is formed between the first sealing cylinder and the external thread section; the second sealing body includes a second sealing cylinder coaxially arranged with the first sealing cylinder, and a connecting cylinder sleeved and fixed on the outside of the second sealing cylinder, one end of the connecting cylinder away from the first sealing body is seal-welded to the outer wall of the second sealing cylinder, and the other end of the connecting cylinder is provided with an internal thread section adapted to the external thread section, and a second annular chamber is formed between the internal thread section and the second sealing cylinder; the sealing ring is located between the first sealing cylinder and the second sealing cylinder, and the two end faces of the sealing ring are in sealing contact with the first sealing cylinder and the second sealing cylinder respectively, and a through hole is provided in the sealing ring to connect the inner hole of the first sealing cylinder and the inner hole of the second sealing cylinder, and the diameter of the through hole is adapted to the outer diameter of the trough of the bellows.

[0007] This solution realizes the connection between the first sealing body and the second sealing body by setting the internal thread section and the external thread section, so that the second sealing tube presses the sealing ring against the front end face of the first sealing tube to realize the sealing at the port of the bellows; by setting up a first annular cavity, space is provided for the flange at the port of the bellows; by setting up a sealing ring, it adapts to the waveform of the bellows, better supports the flange, and helps to improve the sealing effect.

[0008] As an optimization, the sealing ring is further provided with a recessed groove located on the side of the through-hole away from the first sealing cylinder. The recessed groove is coaxial with the through-hole, and its diameter matches the outer diameter of the corrugated pipe at its peak. This optimized sealing ring arrangement allows the inner hole of the sealing ring to better match the corrugated pipe's waveform, further improving its compatibility with the bellows.

[0009] As an optimization, the sealing ring comprises two independent semicircular rings, each of which is positioned in the trough of the bellows, forming a circumferentially closed sealing ring. This optimization solution divides the sealing ring into two independent halves, facilitating installation. After installation, the sealing ring is compressed using the flange of the bellows, preventing the two halves from falling apart.

[0010] As an optimization, a rubber gasket is provided between the sealing ring and the second sealing cylinder. A central hole is provided in the rubber gasket, connecting the through hole and the inner hole of the second sealing cylinder. A boss is provided on the side of the rubber gasket facing the sealing ring, which mates with the recessed groove. This optimization solution ensures a sealing effect when cracks develop on the flange of the bellows.

[0011] As an optimization, the first sealing body is provided with a grouting hole located behind the externally threaded section. This grouting hole extends through the inner hole of the first sealing barrel and is threaded. This optimization solution facilitates the injection of sealing slurry into the first sealing body, further ensuring a reliable seal between the bellows and the first sealing barrel. The threaded grouting hole also facilitates sealing the grouting hole with a screw plug.

[0012] This solution also provides a sealing method using the above-mentioned cooling wall water pipe sealing device, comprising the following steps:

[0013] 1. Install a corrugated pipe into the damaged cooling wall water pipe, and extend both ends of the corrugated pipe out of the cooling wall water pipe;

[0014] 2. Sleeve the first sealing body on the corrugated pipe extending out of the cooling wall water pipe, and weld the rear end of the first sealing body to the cooling wall water pipe to seal it. The end of the corrugated pipe passes through the inner hole of the first sealing cylinder, and the length of the corrugated pipe passing through the first sealing cylinder is 1 to 1.5 times the wavelength of the corrugated pipe;

[0015] 3. Locate the sealing ring in the first trough of the bellows where it is exposed from the first sealing cylinder, and tap the end of the bellows axially until the bellows is flush against the end face of the sealing ring.

[0016] 4. Adhere the rubber sealing gasket to the rear end face of the second sealing cylinder, with the boss facing the first sealing cylinder. Connect the internal thread section of the connecting cylinder to the external thread section of the first sealing body, so that the second sealing cylinder axially presses the rubber sealing gasket and sealing ring against the front end face of the first sealing cylinder.

[0017] 5. Inject resin silicon carbide into the mud from the grouting hole. The resin silicon carbide pressed into the mud flows along the trough of the corrugated pipe to achieve circumferential filling. After the injection is completed, use a wire plug to seal the grouting hole. After the resin silicon carbide pressed into the mud solidifies, the seal between the inner hole wall of the first sealing tube and the corrugated pipe is achieved.

[0018] The beneficial effects of the present invention are as follows: the sealing ring is clamped in the trough of the bellows, which improves the adaptability to the waveform of the bellows, thereby improving the fit between the bellows and the sealing ring and ensuring the sealing effect; the first sealing body and the second sealing body are threadedly connected by internal and external threaded sections, which is convenient for installation and disassembly; the end of the second sealing cylinder is connected to the cooling water supply pipe, which greatly improves the convenience of connection and ensures that the cooling water flows into the water inlet end of the bellows through the inner hole of the second sealing cylinder, and after heat exchange with the cooling wall, flows into the corresponding second sealing cylinder through the water outlet end of the bellows. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the assembly of the sealing device of the present invention;

[0020] Figure 2 This is an exploded schematic diagram of the sealing device of the present invention;

[0021] As shown in the figure:

[0022] 1. First sealing body, 11. First sealing cylinder, 12. Grouting hole, 13. First annular cavity, 14. External thread section, 2. Second sealing body, 21. Connecting cylinder, 22. Second annular cavity, 23. Second sealing cylinder, 3. Sealing ring, 4. Rubber sealing pad. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0024] like Figure 1 The cooling wall water pipe sealing device shown includes a sealing ring 3, a second sealing body 2 and a first sealing body 1 sleeved on a corrugated pipe, the second sealing body is located in front of the first sealing body, the sealing ring is located between the first and second sealing bodies, the corrugated pipe passes through the cooling wall water pipe, and the first sealing body 1 is located at the end of the corrugated pipe passing through the cooling wall water pipe.

[0025] The rear end of the first sealing body is sealed and welded to the pipe mouth of the cooling wall water pipe. The front outer wall of the first sealing body is provided with an external thread section 14. The interior of the external thread section forms a buffer cavity. The buffer cavity is provided with a first sealing cylinder 11 coaxial with the external thread section. The first sealing cylinder 11 and the first sealing body are an integral part and are processed by the shaft. The front end face of the first sealing cylinder is located behind the front end face of the external thread section in the axial direction. The front end face of the external thread section is the front end face of the first sealing body. The inner hole diameter of the first sealing cylinder is adapted to the outer diameter of the bellows, and the inner hole of the first sealing cylinder axially passes through the first sealing body 1. A first annular cavity 13 is formed between the first sealing cylinder 11 and the external thread section. The inner hole, external thread section and first annular cavity of the first sealing cylinder are coaxial.

[0026] The second sealing body 2 includes a second sealing sleeve 23 coaxially arranged with the first sealing sleeve 11, and a connecting sleeve 21 sleeved and fixed to the outside of the second sealing sleeve. The end of the connecting sleeve, away from the first sealing body, is seal-welded to the outer wall of the second sealing sleeve. The other end of the connecting sleeve is provided with an internal threaded section that matches the external threaded section. A second annular cavity 22 is formed between the internal threaded section and the second sealing sleeve 23. The radial dimension of the second annular cavity is greater than the wall thickness of the external threaded section. The front end of the second sealing sleeve extends beyond the connecting sleeve, and the front end of the inner hole of the second sealing sleeve is provided with an internal thread to facilitate connection to the cooling water supply pipe.

[0027] The sealing ring 3 is located between the first sealing cylinder 11 and the second sealing cylinder 23, and the two end faces of the sealing ring are in sealing contact with the first sealing cylinder and the second sealing cylinder respectively. A through hole is provided in the sealing ring to connect the inner hole of the first sealing cylinder and the inner hole of the second sealing cylinder. The diameter of the through hole is adapted to the outer diameter of the trough of the bellows.

[0028] To improve the compatibility of the sealing ring with the bellows, a recessed groove is provided within the sealing ring, located on the side of the through-hole away from the first sealing cylinder 11. The recessed groove is coaxial with the through-hole, and its diameter matches the outer diameter of the bellows at its peaks. Specifically, the sealing ring 3 comprises two independent semicircular rings, each of which is positioned in the trough of the bellows to form a circumferentially closed sealing ring. The two semicircular rings are cut from a single circular ring.

[0029] In order to further ensure the sealing effect and prevent cooling water from leaking when entering the bellows, a rubber sealing gasket 4 is further provided between the sealing ring and the second sealing cylinder in this embodiment. A central hole connecting the through hole and the inner hole of the second sealing cylinder is provided in the rubber sealing gasket 4. A boss adapted to the sinking groove is provided on the side of the rubber sealing gasket 4 facing the sealing ring 3. The rubber sealing gasket is compressed and deformed to further seal the flange of the bellows.

[0030] The first sealing body 1 is provided with a grouting hole 12 located behind the external thread section. The grouting hole 12 radially penetrates to the inner hole of the first sealing cylinder 11. The grouting hole 12 is a threaded hole, and a screw plug is connected in the grouting hole through a thread.

[0031] The sealing method using the cooling wall water pipe sealing device of this embodiment includes the following steps:

[0032] 1. Install a corrugated pipe into the damaged cooling wall water pipe, and extend both ends of the corrugated pipe out of the cooling wall water pipe;

[0033] 2. Sleeve the first sealing body on the corrugated pipe extending out of the cooling wall water pipe, and weld the rear end of the first sealing body to the cooling wall water pipe to seal it. The end of the corrugated pipe passes through the inner hole of the first sealing cylinder, and the length of the corrugated pipe passing through the first sealing cylinder is 1 to 1.5 times the wavelength of the corrugated pipe;

[0034] 3. Locate the sealing ring in the first trough of the bellows where it is exposed from the first sealing cylinder, turn the end of the bellows outward, and then tap it axially to make the bellows flange close to the end face of the sealing ring. If the bellows extends too far beyond the sealing ring, turn the flange to the first annular cavity to wrap around the sealing ring.

[0035] 4. Glue the rubber sealing gasket to the rear end face of the second sealing cylinder to prevent it from falling during installation. With the boss facing the first sealing cylinder, connect the internal thread section of the connecting cylinder with the external thread section of the first sealing body. The second sealing cylinder axially presses the rubber sealing gasket and sealing ring against the front end face of the first sealing cylinder.

[0036] 5. Inject resin silicon carbide into the mud from the grouting hole. The resin silicon carbide pressed into the mud flows along the trough of the corrugated pipe to achieve circumferential filling. After the injection is completed, use a wire plug to seal the grouting hole. After the resin silicon carbide pressed into the mud solidifies, the seal between the inner hole wall of the first sealing tube and the corrugated pipe is achieved.

[0037] After installation using the above method, the front end of the second sealing cylinder is connected to the cooling water supply pipeline. The cooling water enters the bellows through the inner hole of the second sealing cylinder, exchanges heat with the cooling wall, and flows out through the other end of the bellows. Therefore, there is no need to replace the cooling wall or frequently replace the pipe clamps. At the same time, the reliability of the seal is guaranteed and the loss caused by the rupture of the cooling wall water pipe is reduced.

[0038] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by adopting existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical solutions of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A cooling wall water pipe sealing device, characterized in that: It comprises a sealing ring (3), a second sealing body (2) and a first sealing body (1) sleeved on a bellows, the bellows passing through a cooling wall water pipe, and the first sealing body (1) is located at the end of the bellows passing through the cooling wall water pipe; The rear end of the first sealing body is sealed and welded to the pipe mouth of the cooling wall water pipe, the front end outer wall of the first sealing body is provided with an external thread section (14), the interior of the external thread section forms a buffer cavity, the buffer cavity is provided with a first sealing cylinder (11) which is coaxial with the external thread section and is an integral part of the first sealing body, the inner hole diameter of the first sealing cylinder is adapted to the outer diameter of the bellows, and the inner hole of the first sealing cylinder axially passes through the first sealing body (1), and a first annular cavity (13) is formed between the first sealing cylinder (11) and the external thread section; The second sealing body (2) comprises a second sealing cylinder (23) coaxially arranged with the first sealing cylinder, and a connecting cylinder (21) sleeved and fixed on the outside of the second sealing cylinder, one end of the connecting cylinder away from the first sealing body is sealed and welded to the outer wall of the second sealing cylinder, and the other end of the connecting cylinder is provided with an internal thread section adapted to the external thread section, and a second annular cavity (22) is formed between the internal thread section and the second sealing cylinder (23); The sealing ring (3) is located between the first sealing cylinder (11) and the second sealing cylinder (23), and both end surfaces of the sealing ring are in sealing contact with the first sealing cylinder and the second sealing cylinder respectively. A through hole is provided in the sealing ring to connect the inner hole of the first sealing cylinder and the inner hole of the second sealing cylinder, and the diameter of the through hole is adapted to the outer diameter of the trough of the bellows; The sealing ring (3) comprises two mutually independent semicircular rings, which are respectively clamped in the troughs of the bellows to form a sealing ring closed along the circumferential direction. After installation, the sealing ring is compressed by utilizing the flange of the bellows.

2. The cooling wall water pipe sealing device according to claim 1, characterized in that: A recessed groove is also provided in the sealing ring and is located on a side of the through hole away from the first sealing cylinder (11). The recessed groove is coaxial with the through hole, and the diameter of the recessed groove matches the outer diameter of the corrugated pipe at the wave crest.

3. The cooling wall water pipe sealing device according to claim 2, characterized in that: A rubber sealing gasket (4) is provided between the sealing ring and the second sealing cylinder. A central hole communicating with the through hole and the inner hole of the second sealing cylinder is provided in the rubber sealing gasket (4). A boss adapted to the sinking groove is provided on the side of the rubber sealing gasket (4) facing the sealing ring (3).

4. The cooling wall water pipe sealing device according to claim 3, characterized in that: The first sealing body (1) is provided with a grouting hole (12) located behind the external thread section, the grouting hole (12) passes through the inner hole of the first sealing cylinder (11), and the grouting hole (12) is a threaded hole.

5. A sealing method using the cooling wall water pipe sealing device according to claim 4, characterized in that: The steps include: (1) Install a corrugated pipe into the damaged cooling wall water pipe, and extend both ends of the corrugated pipe out of the cooling wall water pipe; (2) The first sealing body is placed on the bellows extending from the cooling wall water pipe, and the rear end of the first sealing body is welded to the cooling wall water pipe to seal, and the end of the bellows passes through the inner hole of the first sealing cylinder, and the length of the bellows passing through the first sealing cylinder is 1 to 1.5 times the wavelength of the bellows; (3) Place the sealing ring in the first trough of the bellows where it is exposed from the first sealing cylinder, and knock the end of the bellows outward along the axial direction so that the bellows flange is close to the end face of the sealing ring; (4) Adhere the rubber sealing gasket to the rear end face of the second sealing cylinder, and make the boss face the first sealing cylinder, connect the internal thread section of the connecting cylinder with the external thread section of the first sealing body, so that the second sealing cylinder presses the rubber sealing gasket and the sealing ring against the front end face of the first sealing cylinder in the axial direction; (5) Resin silicon carbide pressed mud is injected from the grouting hole. The resin silicon carbide pressed mud flows along the trough of the corrugated pipe to achieve circumferential filling. After the injection is completed, the grouting hole is sealed with a wire plug. After the resin silicon carbide pressed mud solidifies, the sealing between the inner hole wall of the first sealing tube and the corrugated pipe is achieved.

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