Steel-plastic pipeline connecting structure

Abstract

The utility model relates to the field of pipeline connection, and discloses a steel-plastic pipeline connection structure which comprises a PE pipe section, a steel pipe section with one end inserted into the PE pipe section in a sealed mode and a pressing sleeve arranged on the steel pipe section in a sleeved mode and clamping the PE pipe section between the steel pipe section and the steel pipe section. The diameter of the inserting section is smaller than the inner diameter of the steel pipe section, the inserting section can be inserted into the PE pipe section in an interference mode, the variable-diameter section is used for connecting the inserting section and the steel pipe section, and an anti-disengaging part is arranged on the outer ring wall of the inserting section and used for conveniently guiding the inserting section into the PE pipe section in a sealed mode and limiting the inserting section to be disengaged from the PE pipe section. The mechanism is arranged on the inserting section of the steel pipe section, the caliber of the inserting section is smaller than the inner diameter of the steel pipe section, the inserting section can be partially inserted into the PE pipe section when the steel pipe section is connected with the PE pipe section, and due to the fact that the diameter of the inserting section is smaller than the inner diameter of the steel pipe section, the overall size can be reduced after the steel pipe section is inserted into the PE pipe section.

Description

Technical Field

[0001] The utility model relates to the field of pipeline connection, in particular to a steel-plastic pipeline connection structure. Background Art

[0002] Natural gas transmission pipelines generally use steel pipes or PE pipes, and steel pipes are generally connected by PE pipes. The Chinese patent with announcement number CN105114744A discloses a steel-plastic conversion connection structure, including a steel inner pressure ring and a PE sleeve pressed on the steel inner pressure ring. The outer side of the steel inner pressure ring is provided with a plurality of barb structures, and the barb structures are stuck on the inner surface of the PE sleeve; the outer side of the steel inner pressure ring is provided with an annular groove, and a sealing ring is provided in the groove, and the sealing ring contacts the inner surface of the PE sleeve; the outer surface of the PE sleeve is provided with an outer pressure ring, and the steel inner pressure ring and the outer pressure ring sandwich the PE sleeve in the middle.

[0003] The barb structure facilitates the introduction of the steel inner pressure ring into the PE sleeve and restricts its reverse separation from the PE sleeve. In order to facilitate the interference fit of the part of the steel inner pressure ring with the barb structure into the PE sleeve, the end of the PE sleeve is expanded, which will cause the end diameter of the PE sleeve to increase and the diameter of the external pressure ring outside it to increase synchronously, which not only increases the volume of both, but also increases the material consumption of both. Utility Model Content

[0004] The utility model aims at the disadvantages of the prior art that the end of a PE sleeve is expanded to achieve interference insertion of the barbed portion of a steel inner pressure ring into the PE sleeve, which increases the required diameters of the PE sleeve and the outer pressure ring, resulting in increased volume and increased material consumption. The utility model provides a steel-plastic pipe conversion connection structure with reduced material consumption and volume.

[0005] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0006] A steel-plastic pipe connection structure comprises a PE pipe section, a steel pipe section with one end sealed and inserted into the PE pipe section, and a compression sleeve steel pipe section which is sleeved on the steel pipe section and clamps the PE pipe section between the steel pipe section and the steel pipe section, and is connected to the PE pipe section through a connecting pipe section, wherein the connecting pipe section comprises a plug-in section which has a diameter smaller than the inner diameter of the steel pipe section and can be inserted into the PE pipe section with interference fit, and a reducing section for connecting the plug-in section and the steel pipe section, and an anti-detachment component which facilitates the plug-in section to be sealed and introduced into the PE pipe section and limits the plug-in section from being separated from the PE pipe section is arranged on the outer ring wall of the plug-in section.

[0007] By adopting the above scheme, the plug-in section with a diameter smaller than the inner diameter of the steel pipe section provided on the steel pipe section can be partially inserted into the PE pipe section when the steel pipe section is inserted into the PE pipe section. Because the diameter of the plug-in section is smaller than the inner diameter of the steel pipe section, the overall volume of the steel pipe section will be reduced when it is inserted into the PE pipe section. At the same time, the diameter of the compression sleeve arranged outside the PE pipe section can also be reduced, thereby further reducing the volume after the two are connected.

[0008] Preferably, the anti-slip component comprises an introduction cone ring concentrically arranged on the outer ring wall of the plug-in section, and the introduction cone ring tends to gradually expand from the insertion direction to the disengagement direction of the plug-in section.

[0009] By adopting the above solution, the probability of the connecting pipe section inserted into the PE pipe section falling out of the PE pipe section can be reduced by providing the introduction cone ring.

[0010] Preferably, a plurality of guide cone rings are evenly spaced along the axial direction of the plug-in section.

[0011] By adopting the above solution, a number of guide cone rings are evenly spaced along the axial direction of the plug-in section, which can further reduce the probability of the connecting pipe section inserted into the PE pipe section falling out of the PE pipe section.

[0012] Preferably, the inner diameter of the compression sleeve is larger than the outer diameter of the PE pipe section and smaller than the outer diameter of the plug-in section plus the wall thickness of the PE pipe section. The insertion end of the compression sleeve is flared and the inner diameter of the insertion end of the compression sleeve is larger than the outer diameter of the plug-in section plus the wall thickness of the PE pipe section.

[0013] By adopting the above scheme, the inner diameter of the pressing sleeve is set to be larger than the outer diameter of the PE pipe section and smaller than the outer diameter of the plug-in section plus the wall thickness of the PE pipe section, so that when the pressing sleeve is inserted from one end of the PE pipe section to the connection between the PE pipe section and the steel pipe section, the connection between the two is squeezed, so that the connection between the two is tighter, and the insertion end of the pressing sleeve is set to be larger than the outer diameter of the plug-in section plus the wall thickness of the PE pipe section, so that the pressing sleeve is easy to insert into the connection between the steel pipe section and the PE pipe section.

[0014] The utility model adopts the above technical scheme, and has significant technical effects: the plug-in section with a diameter smaller than the inner diameter of the steel pipe section arranged on the steel pipe section can be partially inserted into the PE pipe section when the steel pipe section is inserted into the PE pipe section. Because the diameter of the plug-in section is smaller than the inner diameter of the steel pipe section, the overall volume of the steel pipe section will be reduced after it is inserted into the PE pipe section. At the same time, the diameter of the compression sleeve sleeved outside the PE pipe section can also be reduced, thereby further reducing the volume after the two are connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an axonometric view of a pipe section that is convenient for connection of a pipeline in this embodiment;

[0016] Figure 2This is a disassembled diagram of a pipe section that is convenient for connection of a pipeline in this embodiment;

[0017] Figure 3 is a top view of a pipe section for convenient connection of a pipeline in this embodiment;

[0018] Figure 4 yes Figure 3 Sectional view at AA in the middle;

[0019] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0020] The parts indicated by the numerical symbols in the above figures are as follows: 1. PE pipe section; 2. Steel pipe section; 3. Press sleeve; 4. Splice section; 5. Reducer section; 6. Introducing cone ring. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] Example

[0023] A steel-plastic pipe connection structure, reference Figure 1-Figure 3 , comprising a PE pipe section 1, a steel pipe section 2 with one end sealed and inserted into the PE pipe section 1, and a compression sleeve 3 which is sleeved on the steel pipe section 2 and clamps the PE pipe section 1 between the steel pipe section 2 and the steel pipe section 2. The steel pipe section 2 is connected to the PE pipe section 1 through a connecting pipe section. The connecting pipe section comprises a plug-in section 4 which has a diameter smaller than the inner diameter of the steel pipe section 2 and can be inserted into the PE pipe section 1 through interference fit, and a reducing section 5 for connecting the plug-in section 4 and the steel pipe section 2. An anti-detachment component is arranged on the outer ring wall of the plug-in section 4 to facilitate the sealing introduction of the plug-in section 4 into the PE pipe section 1 and to limit the plug-in section 4 from detaching from the PE pipe section 1.

[0024] refer to Figure 2 The anti-slip component includes an introduction cone ring 6 concentrically arranged on the outer ring wall of the plug-in section 4. The introduction cone ring 6 gradually expands from the insertion direction of the plug-in section 4 to the disengagement direction. A plurality of introduction cone rings 6 are evenly spaced along the axial direction of the plug-in section 4.

[0025] refer to Figure 3-Figure 5 The inner diameter of the pressing sleeve 3 is larger than the outer diameter of the PE pipe section 1 and smaller than the outer diameter of the plug-in section 4 plus the wall thickness of the PE pipe section 1. The insertion end of the pressing sleeve 3 is flared, and the inner diameter of the insertion end of the pressing sleeve 3 is larger than the outer diameter of the plug-in section 3 plus the wall thickness of the PE pipe section 1.

[0026] Specific installation process: When the steel pipe section 2 and the PE pipe section 1 need to be connected, first, the plug-in section 4 on the steel pipe section 2 is inserted into the PE pipe section 1. The several guide cone rings 6 arranged on the plug-in section 4 can reduce the probability of the plug-in section 4 escaping from the PE pipe section 1 after the plug-in section 4 is inserted into the PE pipe section 1. After that, the pressing sleeve 3 is inserted from the end of the PE pipe section 1 away from the steel pipe section 2 to the connection between the two. At this time, the pressing sleeve 3 will squeeze the outer wall of the PE pipe section 1, so that the connection between the steel pipe section 2 and the PE pipe section 1 is tighter and the probability of separation from each other is lower.

[0027] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A steel-plastic pipe connection structure, comprising a PE pipe section (1), a steel pipe section (2) with one end sealed and inserted into the PE pipe section (1), and a compression sleeve (3) sleeved on the steel pipe section (2) and clamping the PE pipe section (1) between the steel pipe section (2), characterized in that: The steel pipe section (2) is connected to the PE pipe section (1) via a connecting pipe section, wherein the connecting pipe section comprises a plug-in section (4) having a smaller diameter than the inner diameter of the steel pipe section (2) and capable of being inserted into the PE pipe section (1) by interference fit, and a reducing section (5) for connecting the plug-in section (4) and the steel pipe section (2), wherein an anti-detachment component is provided on the outer ring wall of the plug-in section (4) for facilitating the sealing introduction of the plug-in section (4) into the PE pipe section (1) and for limiting the plug-in section (4) from detaching from the PE pipe section (1).

2. The steel-plastic pipe connection structure according to claim 1, characterized in that: The anti-slip component comprises an introduction cone ring (6) which is concentrically arranged on the outer ring wall of the plug-in section (4), and the introduction cone ring (6) has a tendency to gradually expand from the insertion direction of the plug-in section (4) to the disengagement direction.

3. A steel-plastic pipe connection structure according to claim 2, characterized in that: A plurality of introduction cone rings (6) are evenly spaced along the axial direction of the plug-in section (4).

4. The steel-plastic pipe connection structure according to claim 1, characterized in that: The inner diameter of the pressing sleeve (3) is larger than the outer diameter of the PE pipe section (1) and smaller than the outer diameter of the plug section (4) plus the wall thickness of the PE pipe section (1); the insertion end of the pressing sleeve (3) is flared, and the inner diameter of the insertion end of the pressing sleeve (3) is larger than the outer diameter of the plug section (4) plus the wall thickness of the PE pipe section (1).

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