A waterproof device for the pipe head of a pre-insulated polyurethane direct-buried pipe.

Abstract

This utility model relates to the field of thermal insulation pipe technology and discloses a waterproof device for the pipe head of a pre-insulated polyurethane direct-buried thermal insulation pipe. It includes a pipe shell, an inner wall of which is provided with a sealing mechanism for waterproofing, an outer wall of which is provided with a protective mechanism for the pipe, and a shrinkage mechanism. The sealing mechanism includes a filling layer, the outer wall of which is fixedly connected to the inner wall of the pipe shell, and a snap-fit ​​assembly at the top of the filling layer. In this utility model, the filling layer is first inserted into the inside of the pipe shell, and then a retaining ring connected to it is inserted into an annular groove. The retaining ring then snaps into place inside the pipe shell. The outer wall of the retaining ring has a trapezoidal slope, preventing it from being lifted after being engaged, thus providing limited protection against water ingress into the internal structure.

Description

Technical Field

[0001] This utility model relates to the field of thermal insulation pipe technology, and in particular to a waterproof device for the pipe head of a pre-insulated polyurethane direct-buried thermal insulation pipe. Background Technology

[0002] Insulated pipes are composite pipes that combine pipeline transportation functions with thermal insulation properties. They typically consist of a working steel pipe, an insulation layer, and an outer protective layer. The working steel pipe is responsible for transporting the medium, while the middle insulation layer often uses polyurethane foam, rock wool, or glass wool to effectively reduce heat or cold loss. The outer protective layer serves to prevent corrosion, moisture, and protect the insulation layer; common materials include polyethylene and fiberglass. These pipes are widely used in centralized heating, cooling, petrochemical, and municipal engineering fields. They improve energy transmission efficiency, reduce the impact of the external environment on the medium temperature, extend pipeline service life, and reduce maintenance costs, making them an indispensable key component in modern energy and medium transportation systems.

[0003] The pipe end of a pre-insulated polyurethane direct-buried pipe is a key part of pipe connection and sealing. It usually consists of an exposed working steel pipe end, an insulation layer end treatment structure, and a sealing device. However, during long-term storage, water leakage often occurs, leading to pipe rupture. With the advancement of technology, waterproof devices are the core barrier to prevent moisture from penetrating the insulation layer. They are usually composed of multiple sealing structures, with common forms including heat-shrinkable waterproof sleeves, sealing rings, and butyl rubber putty. However, this type of waterproof structure mostly uses rubber, which can cause the rubber to crack during long-term storage, leading to pipe damage. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a waterproof device for the pipe head of a pre-insulated polyurethane direct-buried pipe, which aims to improve the problem that the existing waterproof structures mostly use rubber structures, which leads to the rubber cracking during long-term storage and thus damage to the pipe.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a waterproof device for the pipe head of a pre-insulated polyurethane direct-buried pipe, comprising a pipe shell, an inner wall of which is provided with a sealing mechanism for waterproof protection, an outer wall of which is provided with a protective mechanism for protecting the pipe, and a shrinkage mechanism. The filling mechanism includes a filling layer, the outer wall of which is fixedly connected to the inner wall of the tube shell, a snap-fit ​​assembly is provided on the top of the filling layer, a retaining ring is fixedly connected to the top of the snap-fit ​​assembly, an annular groove is provided on the top of the retaining ring, a sealing layer is fixedly connected to the top of the annular groove, and an inner tube is provided on the inner wall of the retaining ring.

[0006] As a further description of the above technical solution: The protective mechanism includes a second fixing ring, the inner wall of which is fixedly connected to the outer wall of the tube shell. The top of the second fixing ring is provided with a sliding ring, and the outer wall of the sliding ring is fixedly connected with a protective sleeve. The upper end of the inner wall of the protective sleeve is provided with a connecting ring. The top of the second fixing ring is provided with multiple elastic components, and the outer wall of the tube shell is provided with fixing components.

[0007] As a further description of the above technical solution: The buckle assembly includes an annular groove 1, which is formed on the top of the filling layer, and a fixing ring 1 is slidably connected to the inner wall of the annular groove 1.

[0008] As a further description of the above technical solution: The elastic component includes a limiting post, the bottom of which is fixedly connected to the top of the second fixed ring. A spring is slidably connected to the outer wall of the limiting post, and the upper end of the outer wall of the spring is fixedly connected to the bottom of the sliding ring.

[0009] As a further description of the above technical solution: The fixing component includes a locking post, the outer wall of which is slidably connected to the outer wall of the protective sleeve, and a circular hole is slidably connected inside the outer wall of the locking post, the circular hole being opened on the outer wall of the tube shell.

[0010] As a further description of the above technical solution: The shrinking mechanism includes an arc-shaped clamp one, the inner side of which is slidably connected to the outer wall of the tube shell, an arc-shaped clamp two on the other side of the arc-shaped clamp one, a connecting component on the right side of the arc-shaped clamp one, and a rotating component on the left side of the arc-shaped clamp one.

[0011] As a further description of the above technical solution: The connecting assembly includes a baffle, the left side of which is fixedly connected to the right side of the arc-shaped clamp, a bolt is threaded to the front side of the baffle, and a nut is threaded to the rear side of the bolt.

[0012] As a further description of the above technical solution: The rotating assembly includes a fixed rod, the rear side of which is fixedly connected to the front left end of the arc-shaped clamp, and the outer wall of the fixed rod is rotatably connected to the inner wall of the cylindrical sleeve.

[0013] This utility model has the following beneficial effects: 1. In this utility model, the filling layer is first inserted into the inside of the outer shell of the pipe body, and then the fixing ring connected to the retaining ring is inserted into the annular groove. At this time, the fixing ring is locked with the annular groove, and the retaining ring will also be locked inside the outer shell of the pipe body. Meanwhile, the outer wall of the retaining ring is a trapezoidal slope, so that the retaining ring cannot be lifted after it is locked. At the same time, a sealing layer is used to seal the annular groove on the retaining ring, which effectively protects the internal structure from water ingress. 2. In this utility model, after the outer shell of the tube is connected, the protective sleeve is pulled. The protective sleeve drives the connecting ring and the sliding ring to move upward. At this time, the sliding ring will stretch the spring upward and move upward until it reaches the uppermost end of the limiting post. Then, the locking post is inserted into the circular hole, and the protective sleeve will be fixed. At the same time, the shrinking mechanism is locked between the upper and lower protective sleeves, realizing the function of protecting the outer wall of the tube shell through the protective sleeve. Attached Figure Description

[0014] Figure 1 This is a front view of a polyurethane prefabricated direct-buried insulated pipe head waterproofing device proposed in this utility model; Figure 2 This is a partial structural disassembly diagram of the retaining ring of a waterproof device for the pipe head of a pre-insulated polyurethane direct-buried pipe proposed in this utility model. Figure 3 This is a partial structural disassembly diagram of the outer shell of a polyurethane prefabricated direct-buried insulated pipe head waterproofing device proposed in this utility model. Figure 4 This is a partial structural disassembly diagram of the retaining ring of a waterproof device for the pipe head of a pre-insulated polyurethane direct-buried pipe proposed in this utility model. Figure 5 This is a partial structural disassembly diagram of the arc-shaped clamp of a polyurethane prefabricated direct-buried insulated pipe head waterproofing device proposed in this utility model.

[0015] Legend: 1. Outer shell of the tube; 2. Jointing mechanism; 201. Filling layer; 202. Buckling assembly; 2021. Annular groove one; 2022. Fixing ring one; 203. Retaining ring; 204. Annular groove two; 205. Sealing layer; 206. Inner tube; 3. Protection mechanism; 301. Fixing ring two; 302. Sliding ring; 303. Protective sleeve; 304. Connecting ring; 305. Elastic assembly; 3051. Limiting post; 3052. Spring; 306. Fixing assembly; 3061. Clamping post; 3062. Circular hole; 4. Retraction mechanism; 401. Arc clamp one; 402. Arc clamp two; 403. Connecting assembly; 4031. Baffle; 4032. Bolt; 4033. Nut; 404. Rotating assembly; 4041. Fixing rod; 4042. Cylindrical sleeve. Detailed Implementation

[0016] 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.

[0017] Please see the appendix Figure 1 Appendix Figure 3 and attached Figure 4 An embodiment of this utility model is provided: a waterproof device for the pipe head of a pre-insulated polyurethane direct-buried pipe, including a pipe shell 1, a jointing mechanism 2 provided on the inner wall of the pipe shell 1 for waterproof protection, a protective mechanism 3 for protecting the pipe on the outer wall of the pipe shell 1, and a shrinkage mechanism 4 on the outer wall of the pipe shell 1. The filling mechanism 2 includes a filling layer 201. The outer wall of the filling layer 201 is fixedly connected to the inner wall of the outer shell 1 of the tube body. The top of the filling layer 201 is provided with a snap fastening assembly 202. A retaining ring 203 is fixedly connected to the top of the snap fastening assembly 202. An annular groove 204 is opened on the top of the retaining ring 203. A sealing layer 205 is fixedly connected to the top of the annular groove 204. An inner tube 206 is provided on the inner wall of the retaining ring 203. The snap fastening assembly 202 includes an annular groove 2021. The annular groove 2021 is opened on the top of the filling layer 201. A fixing ring 2022 is slidably connected to the inner wall of the annular groove 2021. Specifically, the system includes a pipe shell 1, the inner wall of which is equipped with a sealing mechanism 2. This sealing mechanism 2 is mainly used to achieve waterproof protection, ensuring that the inside of the pipe is not invaded by external moisture. Simultaneously, the outer wall of the pipe shell 1 is equipped with a protective mechanism 3 to protect the pipe. This protective mechanism 3 can effectively prevent damage to the pipe caused by external physical impacts. Furthermore, the outer wall of the pipe shell 1 is also equipped with a shrinkage mechanism 4. This shrinkage mechanism 4 can shrink and adjust the pipe body when necessary to adapt to different installation and usage requirements. The sealing mechanism 2 specifically includes a filling layer 201. The outer wall of the filling layer 201 is tightly connected to the inner wall of the pipe shell 1 through a fixed connection to ensure its stability and sealing. The top of the filling layer 201 is equipped with a snap-fit ​​assembly 202. A retaining ring 203 is fixedly connected to the top of the fastening assembly 202. An annular groove 204 is provided on the top of the retaining ring 203. A sealing layer 205 is fixedly connected to the top of the annular groove 204. The sealing layer 205 further enhances the waterproof effect. An inner tube 206 is provided on the inner wall of the retaining ring 203. The inner tube 206 is used to guide and support the internal structure of the pipe. The fastening assembly 202 specifically includes an annular groove 2021. The annular groove 2021 is provided on the top of the filling layer 201. A fixing ring 2022 is slidably connected to the inner wall of the annular groove 2021. The fixing ring 2022 can slide in the annular groove 2021, thereby achieving a stable connection between the filling layer 201 and the retaining ring 203, ensuring the stability and reliability of the entire patching mechanism 2.

[0018] Please see the appendix Figure 1 and attached Figure 2 The protective mechanism 3 includes a second fixing ring 301, the inner wall of the second fixing ring 301 is fixedly connected to the outer wall of the outer shell 1 of the tube body, the top of the second fixing ring 301 is provided with a sliding ring 302, the outer wall of the sliding ring 302 is fixedly connected with a protective sleeve 303, the upper end of the inner wall of the protective sleeve 303 is provided with a connecting ring 304, the top of the second fixing ring 301 is provided with multiple elastic components 305, and the outer wall of the outer shell 1 of the tube body is provided with a fixing component 306. Specifically, the protection mechanism 3 includes an important component called a fixing ring 301. The inner wall of the fixing ring 301 is tightly connected to the outer wall of the tube shell 1 through a robust connection, ensuring the stability between the two. At the top of the fixing ring 301, a sliding ring 302 is provided, and the outer wall of the sliding ring 302 is fixedly connected to the outer wall of the protective sleeve 303. The upper part of the inner wall of the protective sleeve 303 is provided with a connecting ring 304 for effective connection with other components. In addition, the top of the fixing ring 301 is also equipped with multiple elastic components 305, which can provide elastic support to a certain extent, ensuring the flexibility and reliability of the protection mechanism 3. The outer wall of the tube shell 1 is also provided with fixing components 306, which are mainly used to further reinforce and protect the entire mechanism, ensuring that it will not loosen or fall off during use, thereby comprehensively improving the safety and stability of the protection mechanism 3.

[0019] Please see the appendix Figure 1 and attached Figure 2 The elastic component 305 includes a limiting post 3051, the bottom of which is fixedly connected to the top of the fixing ring 301. A spring 3052 is slidably connected to the outer wall of the limiting post 3051. The upper end of the outer wall of the spring 3052 is fixedly connected to the bottom of the sliding ring 302. The fixing component 306 includes a locking post 3061, the outer wall of which is slidably connected to the outer wall of the protective sleeve 303. A circular hole 3062 is slidably connected inside the outer wall of the locking post 3061. The circular hole 3062 is opened on the outer wall of the tube shell 1. Specifically, the elastic component 305 consists of a limiting post 3051, which is firmly fixed to the top of the fixing ring 301, ensuring the stability and reliability of the entire structure. A spring 3052 is also provided on the outer wall of the limiting post 3051. This spring 3052 is connected to the limiting post 3051 by a sliding connection. The upper end of the outer wall of the spring 3052 is fixedly connected to the bottom of the sliding ring 302, so that the spring 3052 can undergo elastic deformation when subjected to external force, thereby playing a role in buffering and protection. In addition, the fixing component 306 mainly consists of a locking post 3061. The outer wall of the locking post 3061 is slidably connected to the outer wall of the protective sleeve 303, allowing the locking post 3061 to slide under external force, thereby playing an adjustment and protection role. A circular hole 3062 is also provided inside the outer wall of the locking post 3061. This circular hole 3062 is specially opened on the outer wall of the outer shell 1 of the tube body, allowing the circular hole 3062 to slide with the outer wall of the locking post 3061, thereby making the whole structure more flexible and reliable.

[0020] Please see the appendix Figure 1 and attached Figure 4The shrinking mechanism 4 includes an arc-shaped clamp 401, the inner side of which is slidably connected to the outer wall of the tube shell 1. An arc-shaped clamp 402 is provided on the other side of the arc-shaped clamp 401. A connecting component 403 is provided on the right side of the arc-shaped clamp 401, and a rotating component 404 is provided on the left side of the arc-shaped clamp 401. The connecting component 403 includes a baffle 4031, the left side of which is fixedly connected to the right side of the arc-shaped clamp 401. A bolt 4032 is threadedly connected to the front side of the baffle 4031, and a nut 4033 is threadedly connected to the rear side of the bolt 4032. The rotating component 404 includes a fixing rod 4041, the rear side of which is fixedly connected to the front left end of the arc-shaped clamp 402. The outer wall of the fixing rod 4041 is rotatably connected to the inner wall of the cylindrical sleeve 4042. Specifically, the shrinking mechanism 4 includes an arc-shaped clamp 401. The inner part of the arc-shaped clamp 401 is slidably connected to the outer wall surface of the tube shell 1 to ensure that it can slide smoothly along the outer wall of the tube shell 1 during movement. In addition, an arc-shaped clamp 402 is provided on the other side of the arc-shaped clamp 401 to cooperate with it. The two work together to realize the shrinking function. On the right side of the arc-shaped clamp 401, a connecting component 403 is provided. The connecting component 403 is mainly composed of a baffle 4031. The left edge of the baffle 4031 is tightly connected to the right edge of the arc-shaped clamp 401 by a fixed connection. A threaded hole is provided on the front surface of the baffle 4031, through which a bolt 4032 is threadedly connected. A nut 4033 is threadedly connected to the rear side of the bolt 4032. This threaded connection method facilitates the adjustment and fixation of the connecting component 403. Meanwhile, a rotating component 404 is provided on the left side of the arc-shaped clamp 401. The rotating component 404 mainly includes a fixed rod 4041. The rear end of the fixed rod 4041 is firmly connected to the front left end of the arc-shaped clamp 402 through a fixed connection method, ensuring that the two remain synchronized during movement. The outer wall surface of the fixed rod 4041 forms a rotating connection with the inner wall surface of a cylindrical sleeve 4042. This rotating connection design allows the fixed rod 4041 to rotate freely within the cylindrical sleeve 4042, thereby realizing the flexible adjustment function of the rotating component 404. The shrinking mechanism 4 can efficiently and stably complete its shrinking task in practical applications.

[0021] Working principle: First, the filling layer 201 is inserted into the inside of the outer shell 1 of the pipe body. Then, the fixing ring 2022 connected to the retaining ring 203 is inserted into the annular groove 2021. At this time, the fixing ring 2022 and the annular groove 2021 are locked together. Subsequently, the retaining ring 203 will also be locked inside the outer shell 1 of the pipe body. At the same time, the outer wall of the retaining ring 203 is a trapezoidal slope, so that the retaining ring 203 cannot be lifted after it is locked. Meanwhile, a sealing layer 205 is used to seal the annular groove 204 on the retaining ring 203, which effectively protects the internal structure from water ingress. After the outer shell 1 of the tube is connected, the protective sleeve 303 is pulled. The protective sleeve 303 causes the connecting ring 304 and the sliding ring 302 to move upward. At this time, the sliding ring 302 will stretch the spring 3052 upward until it moves to the uppermost end of the limiting post 3051. Then, the locking post 3061 is inserted into the circular hole 3062. The protective sleeve 303 will be fixed, and the retraction mechanism 4 will be locked between the upper and lower protective sleeves 303, thus realizing the function of protecting the outer wall of the outer shell 1 of the tube through the protective sleeve 303.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waterproof device for the pipe head of a pre-insulated polyurethane direct-buried pipe, comprising a pipe shell (1), characterized in that: The inner wall of the outer shell (1) of the pipe body is provided with a jointing mechanism (2), which is used for waterproof protection. The outer wall of the outer shell (1) of the pipe body is provided with a protective mechanism (3) for protecting the pipe. The outer wall of the outer shell (1) of the pipe body is provided with a shrinking mechanism (4). The filling mechanism (2) includes a filling layer (201), the outer wall of the filling layer (201) is fixedly connected to the inner wall of the outer shell (1) of the tube body, the top of the filling layer (201) is provided with a buckle assembly (202), the top of the buckle assembly (202) is fixedly connected with a retaining ring (203), the top of the retaining ring (203) is provided with an annular groove two (204), the top of the annular groove two (204) is fixedly connected with a sealing layer (205), and the inner wall of the retaining ring (203) is provided with an inner tube (206).

2. The polyurethane pre-insulated direct-buried pipe head waterproofing device according to claim 1, characterized in that: The protective mechanism (3) includes a second fixing ring (301), the inner wall of the second fixing ring (301) is fixedly connected to the outer wall of the outer shell of the tube (1), the top of the second fixing ring (301) is provided with a sliding ring (302), the outer wall of the sliding ring (302) is fixedly connected with a protective sleeve (303), the upper end of the inner wall of the protective sleeve (303) is provided with a connecting ring (304), the top of the second fixing ring (301) is provided with multiple elastic components (305), and the outer wall of the outer shell of the tube (1) is provided with a fixing component (306).

3. The polyurethane pre-insulated direct-buried pipe head waterproofing device according to claim 1, characterized in that: The buckle assembly (202) includes an annular groove (2021), which is formed on the top of the filling layer (201), and a fixing ring (2022) is slidably connected to the inner wall of the annular groove (2021).

4. A waterproofing device for the pipe head of a pre-insulated polyurethane direct-buried pipe according to claim 2, characterized in that: The elastic component (305) includes a limiting post (3051), the bottom of which is fixedly connected to the top of the second fixing ring (301), and a spring (3052) is slidably connected to the outer wall of the limiting post (3051), the upper end of the outer wall of the spring (3052) being fixedly connected to the bottom of the sliding ring (302).

5. A waterproofing device for the pipe head of a pre-insulated polyurethane direct-buried pipe according to claim 2, characterized in that: The fixing component (306) includes a locking post (3061), the outer wall of the locking post (3061) is slidably connected to the outer wall of the protective sleeve (303), and a circular hole (3062) is slidably connected inside the outer wall of the locking post (3061), the circular hole (3062) being opened on the outer wall of the tube shell (1).

6. The waterproofing device for the pipe head of a pre-insulated polyurethane direct-buried pipe according to claim 1, characterized in that: The shrinking mechanism (4) includes an arc-shaped clamp (401), the inner side of which is slidably connected to the outer wall of the tube shell (1), and an arc-shaped clamp (402) is provided on the other side of the arc-shaped clamp (401). A connecting component (403) is provided on the right side of the arc-shaped clamp (401), and a rotating component (404) is provided on the left side of the arc-shaped clamp (401).

7. A polyurethane pre-insulated direct-buried pipe head waterproofing device according to claim 6, characterized in that: The connecting assembly (403) includes a baffle (4031), the left side of which is fixedly connected to the right side of the arc-shaped clamp (401), the front side of which is threaded with a bolt (4032), and the rear side of which is threaded with a nut (4033).

8. A waterproofing device for the pipe head of a pre-insulated polyurethane direct-buried pipe according to claim 6, characterized in that: The rotating assembly (404) includes a fixed rod (4041), the rear side of which is fixedly connected to the front left end of the arc-shaped clamp (402), and the outer wall of the fixed rod (4041) is rotatably connected to the inner wall of the cylindrical sleeve (4042).

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