A double-layer PE pipe connection device and PE pipe

Abstract

This application proposes a double-layer PE pipe connection device and a PE pipe. The double-layer PE pipe connection device is used to connect two PE pipes or one double-layer PE pipe and one single-layer pipe. The inner layer pipe of the double-layer PE pipe is connected through a connection structure, and the outer layer pipe of the double-layer PE pipe is connected to the connection structure through a sleeve body, thereby avoiding collision between the inner and outer layers of the double-layer pipe. In addition, the two outer layers pipes or one outer layer pipe and one single-layer pipe are fixed to the connection structure through a sleeve body, which replaces the use of two sleeve bodies to fix the two, greatly shortening the width of the sleeve body, thereby reducing costs and improving installation efficiency.

Description

Technical Field

[0001] This application relates to the field of PE pipe connection technology, specifically to a double-layer PE pipe connection device and a PE pipe. Background Technology

[0002] When connecting single-layer PE pipes, either heat fusion or electrofusion can be used to meet the requirements. However, in some special operating environments or under certain requirements, such as submarine pipelines or pipelines transporting corrosive liquids, or pipelines that cannot be repaired or replaced after installation or where the cost of repair or replacement is too high, double-layer PE pipes are used. If the inner layer leaks, the outer layer can contain the leaked liquid or gas, preventing it from leaking directly into the environment.

[0003] When connecting double-layer PE pipe sections, the inner layer pipe can be fixed to the connecting unit by heat fusion. When connecting the outer layer pipe, an electrofusion sleeve is required to connect the outer layer pipe to the connecting structure, thus avoiding slippage and collision between the inner and outer layers pipe. However, since conventional electrofusion sleeves only have a certain number of electrofusion wires evenly distributed on the cylinder walls at both ends of the sleeve body, two electrofusion sleeves are required for electrofusion connection to connect the outer layers pipe at both ends to the connecting structure. This method is relatively cumbersome and difficult to operate. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, this application aims to provide a double-layer PE pipe connection device and PE pipe.

[0005] In a first aspect, this application proposes a double-layer PE pipe connection device for connecting two double-layer PE pipes or connecting one end of a double-layer PE pipe and the other end of a single-layer pipe, wherein the double-layer PE pipe includes an inner layer pipe and an outer layer pipe, and a flow gap is formed between the inner layer pipe and the outer layer pipe, and the connection device includes:

[0006] A connecting structure is provided with a first through hole in the middle, and the direction of the extension of the axis of the first through hole is a first direction; at least one end of the connecting structure along the first direction is connected to the inner tube.

[0007] A sleeve body is sleeved outside the connecting structure, with its middle part connected to the connecting structure and its two ends along the first direction respectively connected to the outer tube.

[0008] According to the technical solution provided in the embodiments of this application, the connection structure includes:

[0009] A connecting tube body, wherein the middle part of the connecting tube body is the first through hole, and at least one end of the connecting tube body along the first direction is connected to the inner tube.

[0010] A raised tube body is sleeved on the outside of the connecting tube body and connected to the outer tube at both ends along the first direction; a first melting zone is provided at the connection between the middle part of the sleeve body and the raised tube body, and a second melting zone is provided at the connection between the sleeve body and the outer tube.

[0011] According to the technical solution provided in the embodiments of this application, the distances between the two second melting zones and the first melting zone are equal.

[0012] According to the technical solution provided in the embodiments of this application, the distances between the two second melting zones and the first melting zone are not equal; the end of the outer tube corresponding to the second melting zone that is closer to the first melting zone abuts against the protruding tube body.

[0013] According to the technical solution provided in the embodiments of this application, the protruding tube body has a plurality of flow holes arranged in an array, the direction of the extension line of the axis of each flow hole is the first direction, both ends of the flow hole are connected to the flow gap, or one end is connected to the flow gap and the other end is connected to the single-layer tube.

[0014] According to the technical solution provided in the embodiments of this application, the protruding tube body and the connecting tube body are integrally formed.

[0015] According to the technical solution provided in the embodiments of this application, resistance wires are provided in the first melting zone and the second melting zone.

[0016] According to the technical solution provided in the embodiments of this application, the outer tube or the single-layer tube has the same outer diameter as the protruding tube body.

[0017] Secondly, this application provides a PE pipe, which includes multiple double-layer PE pipes in the middle and single-layer pipes at its ends. The double-layer PE pipes and the single-layer pipes are connected by a double-layer PE pipe connection device as described above.

[0018] In summary, this application proposes a double-layer PE pipe connection device for connecting two PE pipes or one double-layer PE pipe and one single-layer pipe. The inner layer of the double-layer PE pipe is connected through a connection structure, and the outer layer of the double-layer PE pipe is connected to the connection structure through a sleeve body. This avoids collision between the inner and outer layers of the double-layer pipe. In addition, fixing the two outer layers of pipes or one outer layer pipe and one single-layer pipe to the connection structure through a sleeve body replaces the use of two sleeve bodies to fix them, greatly shortening the width of the sleeve body, thereby reducing costs and improving installation efficiency. Attached Figure Description

[0019] Figure 1A cross-sectional schematic diagram of a double-layer PE pipe connection device for connecting two double-layer PE pipes, provided in an embodiment of this application;

[0020] Figure 2 A cross-sectional schematic diagram of a double-layer PE pipe connection device provided in this application embodiment, wherein one side is connected to a double-layer PE pipe and the other side is connected to a single-layer pipe;

[0021] Figure 3 A cross-sectional schematic diagram of a double-layer PE pipe connection device provided in this application embodiment, wherein the first melting zone is equidistant from the two second melting zones and the two PE pipes are connected on both sides;

[0022] Figure 4 A cross-sectional schematic diagram of a double-layer PE pipe connection device provided in this application embodiment, wherein the first melting zone is unequally spaced from the two second melting zones and the two PE pipes are connected on both sides.

[0023] Figure 5 for Figure 1 A cross-sectional schematic diagram of AA in the middle;

[0024] Figure 6 A cross-sectional schematic diagram of a double-layer PE pipe connection device (excluding the sleeve body) with a flow passage hole for the protruding pipe body;

[0025] Figure 7 A cross-sectional schematic diagram of a double-layer PE pipe connection device (excluding the sleeve body) without a flow passage hole in the protruding pipe body.

[0026] The text labels in the image represent:

[0027] 1. Connecting pipe body; 2. Protruding pipe body; 3. Flow through hole; 4. Sleeve body; 5. Double-layer PE pipe; 51. Outer pipe; 52. Inner pipe; 6. Single-layer pipe; 8. Flow gap; 91. First melting zone; 92. Second melting zone. Detailed Implementation

[0028] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Example 1

[0031] As mentioned in the background section, this application proposes a double-layer PE pipe connection device for connecting two double-layer PE pipes 5 or connecting one end of a double-layer PE pipe 5 and the other end of a single-layer pipe 6. The double-layer PE pipe 5 includes an inner pipe 52 and an outer pipe 51, with a flow gap 8 formed between the inner pipe 52 and the outer pipe 51. The connection device includes:

[0032] A connecting structure is provided with a first through hole in the middle, and the direction of the extension of the axis of the first through hole is a first direction; at least one end of the connecting structure along the first direction is connected to the inner tube 52.

[0033] The sleeve body 4 is sleeved outside the connecting structure, with its middle part connected to the connecting structure and its two ends along the first direction respectively connected to the outer tube 51.

[0034] Specifically, the first direction is as follows: Figure 1 As shown in the left-right direction, when connected to two double-layer PE pipes 5, the two inner pipes 52 are connected to the connecting structure, and the two outer pipes 51 are connected to the connecting structure through a sleeve body 4; when connected to one double-layer PE pipe 5 and one single-layer pipe 6, the inner pipe 52 is connected to the connecting structure, and the outer pipes 51 and the single-layer pipe 6 are connected to the connecting structure through a sleeve body 4; by fixing the inner pipes 52 and outer pipes 51 through the connecting structure and the sleeve body 4, collision between the inner pipes 52 and outer pipes 51 of the double-layer pipe is avoided. In addition, fixing the two outer pipes 51 or one outer pipe 51 and one single-layer pipe 6 to the connecting structure through a sleeve body 4 replaces fixing the two with two sleeve bodies 4, which greatly shortens the width of the sleeve body 4, thereby reducing costs and improving installation efficiency.

[0035] In a preferred embodiment, the connection structure includes:

[0036] Connecting tube 1, the middle part of the connecting tube 1 is the first through hole, and at least one end of the connecting tube 1 along the first direction is connected to the inner tube 52;

[0037] A raised tube body 2 is sleeved outside the connecting tube body 1, and its two ends along the first direction are connected to the outer tube 51. A first melting zone 91 is provided at the connection between the middle part of the sleeve body 4 and the raised tube body 2, and a second melting zone 92 is provided at the connection between the sleeve body 4 and the outer tube 51. In the prior art, when two double-layer PE pipes 5 are connected by two sleeves, two melting zones are provided on the raised tube body 2. However, when connected by one sleeve body 4 in this application, only one first melting zone 91 is provided on the raised tube body 2. Therefore, the length of the connection structure can be shortened, thereby reducing production costs.

[0038] Specifically, when the connecting structure is connected to two double-layer PE pipes 5 at both ends, the two ends of the connecting pipe body 1 are connected to the inner layer pipe 52, and the two ends of the protruding pipe body 2 are connected to the two outer layer pipes 51 through the sleeve body 4. The inner and outer diameters of the inner layer pipe 52 and the connecting pipe body 1 are the same, which improves the connection strength while ensuring a constant flow velocity. When the connecting structure is connected to a double-layer PE pipe 5 at one end and a single-layer pipe 6 at the other end, one end of the connecting pipe body 1 is connected to the inner layer pipe 52, and the other end is suspended. The protruding pipe body 2 is connected to the outer layer pipe 51 and the single-layer pipe 6 through the sleeve body 4 at one end. The outer layer pipe 51 or the single-layer pipe 6 has the same outer diameter as the protruding pipe body 2, thereby increasing the contact area when the sleeve body 4 is connected to the outer layer pipe 51 or the single-layer pipe 6, and improving the stability of the connection. Optionally, the inner layer pipe 52 is DN400 SDR11; the outer layer pipe 51 or the single-layer pipe 6 is DN500 SDR17.

[0039] In a preferred embodiment, resistance wires are provided within the first melting zone 91 and the second melting zone 92. When energized, the resistance wires generate Joule heat, causing localized melting at the connection point, thus achieving a secure connection between the sleeve body 4 and the outer tube 51 or the single-layer tube 6. The three melting zones of this application replace the four melting zones of the two sleeves in the prior art, significantly improving connection efficiency.

[0040] In a preferred embodiment, the two second melting zones 92 are equidistant from the first melting zone 91. The protruding tube 2 is located at the center of the sleeve body 4.

[0041] In a preferred embodiment, the two second melting zones 92 are not equidistant from the first melting zone 91; the end of the outer tube 51 corresponding to the second melting zone 92 closest to the first melting zone 91 abuts against the protruding tube body 2.

[0042] In a specific scenario, the double-layer PE pipe 5 on one side is first connected via the sleeve body 4. After connection, the end of the double-layer PE pipe 5 or single-layer pipe 6 on the other side is pressed against the side wall of the protruding pipe body 2 to shorten the length of the sleeve body 4. Then, the sleeve body 4 is connected to the outer pipe 51 or single-layer pipe 6 via the resistance wire corresponding to that side. In this scenario, the length of the sleeve body 4 can be shortened to a suitable length, further reducing costs.

[0043] In a preferred embodiment, the protruding tube body 2 has a plurality of flow holes 3 arranged in an array, the direction of the extended axis of each flow hole 3 is the first direction, both ends of the flow hole 3 are connected to the flow gap 8, or one end is connected to the flow gap 8 and the other end is connected to the single-layer tube 6.

[0044] Specifically, the flow passage 3 can be set or not set depending on the application scenario. In the scenario where the flow passage 3 is set, when both sides are double-layer PE pipes 5, both ends of the flow passage 3 are connected to the flow gap 8. When a leak occurs on the inner pipe 52, the fluid in the inner pipe 52 enters the flow gap 8 through the leak and then flows out from one end through the flow passage 3 in the direction of fluid flow. When one end is connected to the double-layer PE pipe 5 and the other end is connected to the single-layer pipe 6, the fluid in the inner pipe 52 enters the flow gap 8 through the leak and flows out from the single-layer pipe 6 in the direction of fluid flow through the flow passage 3.

[0045] In a preferred embodiment, the protruding tube 2 and the connecting tube 1 are integrally formed.

[0046] Alternatively, the material can be manufactured using a machining process, with rectangular blocks obtained through extrusion, and then the connecting tube 1 and the protruding tube 2 milled out using a machine tool. This process avoids the problem of pressure reduction during welding.

[0047] Example 2

[0048] Based on Embodiment 1, this application proposes a PE pipe, which includes multiple double-layer PE pipes 5 in the middle and single-layer pipes 6 at its ends. The double-layer PE pipes 5 and the single-layer pipes 6 are connected by the double-layer PE pipe connection device described above.

[0049] Specifically, in some application scenarios, in order to save costs, a single-layer pipe 6 with the same outer diameter as the raised pipe body 2 is used at the end of the pipeline, and multiple double-layer PE pipes 5 and single-layer pipes 6 are connected by multiple connecting devices.

[0050] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A double-layer PE pipe connecting device for connecting two double-layer PE pipes (5) or connecting a double-layer PE pipe (5) at one end and a single-layer pipe (6) at the other end, wherein The double-layer PE pipe (5) includes an inner layer pipe (52) and an outer layer pipe (51), with a flow gap (8) formed between the inner layer pipe (52) and the outer layer pipe (51). The connecting device comprises: A connecting structure is provided in the middle of the connecting structure, and the direction of the extension of the axis of the first through hole is a first direction; at least one end of the connecting structure along the first direction is connected to the inner tube (52); The sleeve body (4) is sleeved outside the connecting structure, with its middle part connected to the connecting structure and its two ends along the first direction connected to the outer tube (51).

2. The dual layer PE pipe connection device according to claim 1, characterized in that, The connection structure includes: A connecting tube (1) is provided, the middle part of which is the first through hole, and at least one end of the connecting tube (1) along the first direction is connected to the inner tube (52). The protruding tube (2) is sleeved outside the connecting tube (1) and connected to the outer tube (51) at both ends along the first direction; a first melting zone (91) is provided at the connection between the middle part of the sleeve body (4) and the protruding tube (2), and a second melting zone (92) is provided at the connection between the sleeve body (4) and the outer tube (51).

3. The dual layer PE pipe connection device according to claim 2, characterized in that, The two second molten zones (92) are equidistant from the first molten zone (91).

4. The dual layer PE pipe coupling device of claim 2, wherein, The two second melting zones (92) are not equidistant from the first melting zone (91); the end of the outer tube (51) corresponding to the second melting zone (92) near the first melting zone (91) abuts against the protruding tube body (2).

5. The dual layer PE pipe coupling device of claim 2, wherein, The protruding tube body (2) has multiple flow holes (3) arranged in an array. The direction of the extension line of the axis of each flow hole (3) is the first direction. Both ends of the flow hole (3) are connected to the flow gap (8), or one end is connected to the flow gap (8) and the other end is connected to the single-layer tube (6).

6. The double-layer PE pipe connection device according to claim 2, characterized in that, The protruding tube (2) and the connecting tube (1) are integrally formed.

7. The dual layer PE pipe coupling device of claim 2, wherein, Resistance wires are provided in the first melting zone (91) and the second melting zone (92).

8. The dual layer PE pipe coupling device of claim 2, wherein, The outer tube (51) or the single tube (6) has the same outer diameter as the protruding tube body (2).

9. A PE pipe, characterized in that The middle section includes multiple double-layer PE pipes (5), and the ends include single-layer pipes (6). The double-layer PE pipes (5) and the single-layer pipes (6) are connected by a double-layer PE pipe connection device as described in any one of claims 1-8.

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