Waterproof direct-buried heat-insulating pipe

Abstract

The utility model discloses a waterproof direct -buried heat preservation pipe, including outer tube, inner tube and weld ring, and weld ring is located between two inner tubes, is provided with the heat preservation layer between outer tube and inner tube, is provided with the link ring between two outer tubes, and the link ring inner center fixedly connected with the limiting ring, and the both ends of link ring are all threadedly connected with the extension ring, is set up annular recess on the extension ring, and the first sealing ring is contacted with one end away from the limiting ring of annular recess, and the first sealing ring is contacted with the pressure ring one end away from the extension ring, and the pressure ring threadedly connected extension ring, and the extension ring insideside is contacted with the outer tube outside, the utility model discloses through setting up the link ring between two outer tubes, then use the extension ring to adjust the link spacing between two pipe fittings, then use the pressure ring and extrude the first sealing ring and the second sealing ring and limit, thereby promote the link ring in the sealed state, then carry out polyurethane foam injection again, can reduce the gap between outer tube and pressure ring, reduce the water inlet and internal part corrosion phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of mold processing technology, specifically to a waterproof direct-buried heat-insulating pipe. Background Technology

[0002] Waterproof and heat-insulating direct-buried pipes are composite pipes that integrate functions such as heat insulation, waterproofing, and corrosion resistance. They typically consist of a working steel pipe for transporting the medium, an insulation layer of rigid polyurethane foam or aerogel felt, and an outer shell of high-density polyethylene or fiberglass. They can be widely used in urban centralized heating, petrochemical, municipal engineering and other fields.

[0003] According to Chinese Patent Publication No. CN219623544U, entitled "A Waterproof Direct-Buried Insulated Pipe," the invention mainly describes a sealing block located within the gap between the outer pipe and the insulation block, with the sealing block screwed to the inner wall of the outer pipe. An end cap is fitted onto the inner pipe and fixedly connected to the sealing block. The sealing block and end cap completely enclose the insulation block within the outer pipe, preventing contact with the outside environment and thus avoiding corrosion from external liquids. A sealing gasket is provided between the end cap and the sealing block, with an elastic gasket located in a first groove and a second groove. The sealing gasket and elastic gasket seal the connection gap, preventing corrosive liquids from entering. Compared to traditional technologies, this invention uses a sealing structure to seal the insulation block within the outer pipe, preventing corrosion from external liquids.

[0004] By setting end caps and sealing gaskets between the outer and inner pipes, the insulation block can be completely retracted into the space between the outer and inner pipes. However, welding is required between the two buried pipes. The common practice is to weld the joints of the two pipe fittings and connect them with electrofusion sleeves and heat shrink tape. After drilling holes, expanding foam is mechanically filled into the electrofusion sleeves to form an insulation layer, and then sealed with special plugs. This process takes a lot of time, and when there is a gap between the injection hole and the plug, water can enter, leading to corrosion and affecting the waterproof and insulation effect of the buried pipe. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a waterproof direct-buried insulation pipe to reduce the amount of water in the soil entering the interface of the direct-buried pipe through the glue injection hole and plug, thereby preventing corrosion and affecting the waterproof and insulation effect of the direct-buried pipe.

[0006] The technical solution adopted by this utility model to solve the technical problem is: a waterproof direct-buried heat-insulating pipe, including an outer pipe, an inner pipe and a welding ring, wherein the welding ring is located between two inner pipes, a heat-insulating layer is provided between the outer pipe and the inner pipe, a connecting ring is provided between the two outer pipes, a limiting ring is fixedly connected to the center of the connecting ring, and extension rings are threaded to both ends of the connecting ring. An annular recess is provided on the extension ring, and a first sealing ring is contacted at the end of the annular recess away from the limiting ring. A pressure ring is contacted at the end of the first sealing ring away from the extension ring, and the pressure ring is threaded to the extension ring. The inner side of the extension ring is in contact with the outer side of the outer pipe.

[0007] As a preferred technical solution of this utility model, each of the opposite ends of the pressure ring is fixedly connected with an annular protrusion, which corresponds to the two ends of the connecting ring. By setting the annular protrusion, it can connect with the two ends of the connecting ring in the threaded connection mode, and the sealing performance is increased through contact.

[0008] As a preferred technical solution of this utility model, the connecting ring has two first annular grooves, and a second sealing ring is inserted into the first annular groove. The opposite side of the two second sealing rings contacts the limiting ring, and the side of the two second sealing rings that are far apart from each other corresponds to the extension ring. The sealing performance of the connection between the connecting ring and the outer tube can be further increased by the second sealing ring and the extension ring.

[0009] As a preferred technical solution of this utility model, two through holes are opened on the upper side of the connecting ring, and the through holes extend to the inner side of the limiting ring. A polyethylene pressure nail is inserted into the through hole, and a pressure plate is fixedly connected to the upper end of the polyethylene pressure nail. By setting the polyethylene pressure nail, the through holes can be connected, thereby completing the seal between the connecting ring and the outer tube after the material is injected.

[0010] As a preferred technical solution of this utility model, the bottom side of the pressure plate is in contact with a pressure pad, and the other side of the pressure pad is fixedly connected to the connecting ring. The pressure pad is made of polyethylene material. By setting the pressure pad, the connection effect can be increased, the pressure can be dispersed and loosening can be prevented.

[0011] This utility model has the following advantages: by setting a connecting ring between two outer tubes, then using an extension ring to adjust the connection gap between the two tubes, and then using a pressure ring to limit and squeeze the first sealing ring and the second sealing ring, the connecting ring is in a sealed state. Then, polyurethane foam is injected, which can reduce the gap between the outer tube and the pressure ring, and reduce water ingress and corrosion of internal parts. Attached Figure Description

[0012] Figure 1 This is a side sectional view of a preferred embodiment of the waterproof direct-buried heat-insulating pipe of the present invention.

[0013] Figure 2 This is a three-dimensional sectional view of the connecting ring of a waterproof direct-buried heat-insulating pipe according to a preferred embodiment of the present invention.

[0014] Figure 3 This is an enlarged structural diagram of point A of a preferred embodiment of the waterproof direct-buried heat-insulating pipe of this utility model.

[0015] Explanation of reference numerals in the attached drawings: 1. Outer tube; 2. Inner tube; 3. Welding ring; 4. Connecting ring; 5. Limiting ring; 6. Extension ring; 7. Annular recess; 8. First sealing ring; 9. Pressure ring; 10. First annular groove; 11. Second sealing ring; 12. Polyethylene pressure nail; 13. Pressure pad. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Please refer to the following: Figure 1-3 The waterproof direct-buried insulated pipe shown includes an outer pipe 1, an inner pipe 2, and a welding ring 3. The welding ring 3 is used to connect the two inner pipes 2 and is located between the two inner pipes 2. An insulation layer is provided between the outer pipe 1 and the inner pipe 2. A connecting ring 4 is provided between the two outer pipes 1. A limiting ring 5 is fixedly connected to the center of the connecting ring 4. Both ends of the connecting ring 4 are threadedly connected to extension rings 6. Then, the extension rings 6 are squeezed and limited by a pressure ring 9. Furthermore, the first sealing ring 8 and the second sealing ring 11 are squeezed by the pressure ring 9 and the extension ring 6 respectively, thereby sealing the gap and achieving the effect of a tight gap. An annular recess 7 is provided on the extension ring 6. The end of the annular recess 7 away from the limiting ring 5 contacts the first sealing ring 8. The end of the first sealing ring 8 away from the extension ring 6 contacts the pressure ring 9. The pressure ring 9 is threadedly connected to the extension ring 6. The inner side of the extension ring 6 contacts the outer side of the outer pipe 1.

[0018] Among them, the ends of the two pressure rings 9 that are far apart from each other are fixedly connected with annular protrusions. The annular protrusions correspond to the two ends of the connecting ring 4. The contact between the annular protrusions and the connecting ring 4 can further tighten the gap.

[0019] The connecting ring 4 has two first annular grooves 10, and a second sealing ring 11 is inserted into the first annular groove 10. The opposite side of the two second sealing rings 11 contacts the limiting ring 5, and the side of the two second sealing rings 11 that are far apart from each other corresponds to the extension ring 6. By setting the second sealing rings 11, when the extension ring 6 moves toward the limiting ring 5, it can provide the effect of squeezing the second sealing rings 11, thereby sealing the gap between the connecting ring 4 and the outer side of the extension ring 6.

[0020] The connecting ring 4 has two through holes on its upper side, which extend to the inner side of the limiting ring 5. A polyethylene pressure nail 12 is inserted into the through hole, and a pressure plate is fixedly connected to the upper end of the polyethylene pressure nail 12. By setting the polyethylene pressure nail 12, the through hole can be connected, which facilitates sealing the through hole after the foam glue is injected.

[0021] The bottom side of the pressure plate is in contact with a pressure pad 13, and the other side of the pressure pad 13 is fixedly connected to the connecting ring 4. The pressure pad 13 is made of polyethylene. By setting the pressure pad 13, the polyethylene pressure pad 13 can be heat-melted by hot baking and extrusion, further providing adaptability.

[0022] Working principle: First, the connecting ring 4, extension ring 6, first sealing ring 8, and second sealing ring 11 are fitted onto one side of one of the outer pipes 1. Then, after two adjacent inner pipes 2 are connected, a welding ring 3 is formed using a welding gun. Then, the extension ring 6 is rotated to squeeze the second sealing ring 11. The pressure ring 9 is then rotated to squeeze the first sealing ring 8. At this time, the gap between the connecting ring 4 and the extension ring 6, as well as the gap between the extension ring 6 and the outer pipe 1, are sealed, thereby reducing water ingress caused by the gap between the glue injection hole and the plug, reducing corrosion, and improving the waterproof and heat insulation effect of the direct-buried pipe during connection.

[0023] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

[0024] All other parts of this utility model that are not described in detail belong to the prior art, and therefore will not be described in detail here.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A waterproof direct-buried insulated pipe, comprising an outer pipe (1), an inner pipe (2), and a welding ring (3), wherein the welding ring (3) is located between two inner pipes (2), and an insulation layer is provided between the outer pipe (1) and the inner pipes (2), characterized in that, A connecting ring (4) is provided between the two outer tubes (1). A limiting ring (5) is fixedly connected to the center of the connecting ring (4). Both ends of the connecting ring (4) are threaded with extension rings (6). An annular recess (7) is provided on the extension ring (6). The end of the annular recess (7) away from the limiting ring (5) contacts a first sealing ring (8). The end of the first sealing ring (8) away from the extension ring (6) contacts a pressure ring (9). The pressure ring (9) is threaded to the extension ring (6). The inner side of the extension ring (6) contacts the outer side of the outer tube (1).

2. The waterproof direct-buried heat-insulating pipe as described in claim 1, characterized in that, Both of the two pressure rings (9) have annular protrusions fixedly connected to their ends that are far apart from each other, and the annular protrusions correspond to the two ends of the connecting ring (4).

3. A waterproof direct-buried heat-insulating pipe as described in claim 2, characterized in that, The connecting ring (4) has two first annular grooves (10), and a second sealing ring (11) is inserted into the first annular groove (10). The opposite side of the two second sealing rings (11) is in contact with the limiting ring (5), and the side of the two second sealing rings (11) that are far apart from each other corresponds to the extension ring (6).

4. A waterproof direct-buried heat-insulating pipe as described in claim 3, characterized in that, Two through holes are opened on the upper side of the connecting ring (4), and the through holes extend to the inner side of the limiting ring (5). A polyethylene pressure nail (12) is inserted into the through hole, and a pressure plate is fixedly connected to the upper end of the polyethylene pressure nail (12).

5. A waterproof direct-buried heat-insulating pipe as described in claim 4, characterized in that, The bottom side of the pressure plate is in contact with a pressure pad (13), and the other side of the pressure pad (13) is fixedly connected to the connecting ring (4). The pressure pad (13) is made of polyethylene material.

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