Pipe welding joint hot melt patching sleeve with thermal insulation layer

Abstract

The application discloses a pipeline welding joint heat-melting and pasting sleeve with a heat preservation layer, which comprises a heat-melting and pasting sleeve body, wherein the heat-melting and pasting sleeve body is provided with a heat-melting adhesive layer, one side of the heat-melting adhesive layer is provided with an intermediate filling layer, the outer side of the intermediate filling layer is provided with an outer coating layer, the outer wall of the outer coating layer is further provided with a heat preservation protective layer, the inner middle part of the intermediate filling layer is provided with a reinforcing rib, the inner middle part of the heat-melting and pasting sleeve body is further provided with a reinforcing support block, the two sides of the reinforcing support block are respectively provided with a limiting slot and a limiting protrusion which can be inserted and matched, the inner middle part of the heat-melting and pasting sleeve body is further providedwith the reinforcing support block, and the inner middle part of the intermediate filling layer is provided with the reinforcing rib, so that the structural strength of the heat-melting and pasting sleeve is increased, the tear resistance of the heat-melting and pasting sleeve is greatly improved, and the service life of the heat-melting and pasting sleeve is improved.

Description

Technical Field

[0001] This invention relates to the field of pressure screen basket technology, specifically a hot-melt bonding sleeve for pipe welding joints with insulation layer. Background Technology

[0002] Pipeline weld joint heat fusion bonding sleeves (commonly known as electrofusion sleeves or heat shrink sleeves) are key pipe fittings used for corrosion protection and insulation at welded joints of thermal, oil, and gas pipelines. Depending on the application scenario and process principle, they are mainly divided into two categories: electrofusion sleeves and radiation cross-linked heat shrink sleeves. Heat shrink sleeves (3PE heat shrink sleeves): are composed of radiation cross-linked polyolefin substrate and special sealing hot melt adhesive. After heating, the substrate shrinks radially, and the adhesive layer melts, forming a strong corrosion-resistant layer. They possess high mechanical strength, UV resistance, and aging resistance, and are widely used for corrosion protection of welded joints in long-distance oil and gas pipelines.

[0003] A prior art heat shrinkable tape for pipe repair, with application number 202321351103.3, includes a hot melt adhesive layer, a waterproof layer fixedly connected to the top of the hot melt adhesive layer, a reinforcing fiber layer fixedly connected to the top of the waterproof layer, a heat shrinkable layer fixedly connected to the top of the reinforcing fiber layer, and an anti-oxidation layer fixedly connected to the top of the heat shrinkable layer. Each of the hot melt adhesive layer, waterproof layer, reinforcing fiber layer, heat shrinkable layer, and anti-oxidation layer has a groove on one side. The waterproof layer prevents external moisture from entering the interior of the heat shrinkable tape. This ensures that the heat shrinkable tape adheres firmly to the weld joint, preventing corrosion from air and extending the service life of the pipe. The grooves and anti-oxidation layer facilitate manual tearing without tools, and the markings on the anti-oxidation layer make the tear smoother and allow for easy inspection of the tape's length. However, when the heat-melt bonding sleeve is wrapped around the outside of the pipe weld joint, the stability of the bonding between the interface end of the heat-melt bonding sleeve and the outside of the sleeve is poor, and the heat-melt bonding sleeve is prone to peeling off due to the interface end lifting. Summary of the Invention

[0004] The purpose of this invention is to provide a pipe welding joint heat fusion bonding sleeve with a heat insulation layer, so as to solve the problem that in the prior art, when the heat fusion bonding sleeve is wrapped around the outside of the pipe welding joint, the bonding stability between the interface end of the heat fusion bonding sleeve and the outside of the heat fusion bonding sleeve is poor, and the heat fusion bonding sleeve is prone to peeling off due to the interface end.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hot melt bonding sleeve for pipe welding joints with a thermal insulation layer, comprising a hot melt bonding sleeve body, the hot melt bonding sleeve body including a hot melt adhesive layer, an intermediate filling layer on one side of the hot melt adhesive layer, an outer sheath layer on the outside of the intermediate filling layer, a thermal insulation protective layer on the outer wall of the outer sheath layer, a reinforcing rib in the middle of the intermediate filling layer, and a reinforcing block in the middle of the hot melt bonding sleeve body, with a limiting slot and a limiting protrusion on both sides of the reinforcing block respectively for insertion and engagement.

[0006] Furthermore, the reinforcing blocks are made of alloy and are arranged in multiple equal intervals, with a through hole in the center of each reinforcing block.

[0007] Furthermore, the limiting slot on one side of the reinforcing block is configured as a rectangular slot, and the limiting protrusion is configured as a rectangular protrusion.

[0008] Furthermore, the intermediate filling layer is made of radiation cross-linked polyethylene substrate, the outer sheath layer is made of PE protective layer, and the thermal insulation and protective layer is made of EPDM rubber layer.

[0009] Furthermore, the thermal insulation layer is embedded in a groove on the outer side of the outer liner, and the thickness of the thermal insulation layer is half the thickness of the outer liner.

[0010] Furthermore, the reinforcing rib includes transverse ribs and longitudinal ribs, and the transverse ribs and longitudinal ribs are vertically fixed and welded.

[0011] Furthermore, the transverse and longitudinal ribs are configured as I-shaped ribs, and multiple sets of the transverse and longitudinal ribs are provided at equal intervals.

[0012] Furthermore, one end of the transverse rib is fixedly welded to the outer wall of the reinforcing block, and a hemispherical stabilizing block is provided outside the connection between the transverse rib and the reinforcing block.

[0013] Furthermore, multiple reversible temperature-changing indicator strips are embedded between the thermal insulation protective layer and the outer layer, and the temperature-changing indicator strips are arranged along the axial direction of the hot melt adhesive sleeve body; the temperature-changing indicator strips display their original color when the temperature is below the melting temperature of the hot melt adhesive layer, and permanently change color after reaching the standard construction temperature of the hot melt adhesive, and do not return to their original color after cooling; the temperature-changing indicator strips are attached to the bottom of the groove of the outer layer, and their thickness is less than that of the thermal insulation protective layer, so as not to protrude and damage the flatness of the outer layer; the temperature-changing indicator strips are segmented to correspond to the position of a single reinforcing block, and the length of each indicator strip is matched with the axial length of the reinforcing block, so as to monitor the hot melt temperature of each plug-in locking position individually.

[0014] Furthermore, multiple spiral guide grooves are formed on the inner surface of the hot melt adhesive layer, with both ends of the guide grooves extending to the left and right overlapping ports of the hot melt bonding sleeve body; the two ends of the through hole in the middle of the reinforcing block are connected to the guide grooves to form a through drainage channel; the spiral guide grooves slope downwards from the middle to both ends with a slope of 2°-5°, and water accumulated at the bottom of the pipe can flow along the guide grooves to the overlapping ports of the sleeve body for discharge; a small water guide notch is formed at the bottom of the limiting slot, and water accumulated in the guide grooves can pass through the water guide notch and the limiting protrusion of the plug-in fit to be discharged outwards.

[0015] Furthermore, an elastic buffer and noise-reducing liner can be detachably attached to the inner side of the hot melt adhesive layer. The liner is made of closed-cell nitrile rubber. Fastening strips are provided at both ends of the liner, which can be fastened to the inner edge of the reinforcing block for fixation. Alignment through holes matching the flow channel are opened on the surface of the buffer and noise-reducing liner to avoid blocking the internal drainage channel. The thickness of the buffer and noise-reducing liner is 2-4mm to accommodate the radial deformation caused by the thermal expansion and contraction of the pipeline and to offset vibration noise.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The present invention further includes a reinforcing block in the middle of the body of the hot melt bonding sleeve, and a reinforcing rib in the middle of the middle filling layer. One end of the transverse rib of the reinforcing rib is fixedly welded to the outer wall of the reinforcing block, which increases the internal structural strength of the hot melt bonding sleeve, greatly improves the tear resistance of the hot melt bonding sleeve, and helps to improve the service life of the hot melt bonding sleeve.

[0017] This invention features a reinforcing support block with interlocking limiting slots and limiting protrusions on both sides. The limiting slot on one side of the reinforcing support block is a rectangular slot, and the limiting protrusion is a rectangular protrusion. This allows the hot-melt bonding sleeve body to be wrapped around the outside of the pipe welding joint. By inserting the limiting slot of the reinforcing support block at the interface end of the hot-melt bonding sleeve body into the limiting protrusion of the external reinforcing support block at the other end of the hot-melt bonding sleeve body, the stability of the fit between the interface end of the hot-melt bonding sleeve body and the outside of the hot-melt bonding sleeve body is increased, preventing the hot-melt bonding sleeve body from lifting and falling off due to the interface end.

[0018] This invention features an additional thermal insulation protective layer on the outer wall of the outer liner. This thermal insulation protective layer is made of EPDM rubber and is embedded in a groove on the outer side of the outer liner. The thickness of the thermal insulation protective layer is half that of the outer liner, which gives the outer liner excellent thermal insulation performance and increases the thermal insulation capacity of the heat-fused-to-bond sleeve body. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1This is a schematic diagram of the hot melt bonding sleeve winding structure of the present invention; Figure 2 This is a schematic diagram of the unfolded structure of the hot melt bonding sleeve body of the present invention; Figure 3 This is a structural diagram of the connection between the reinforcing support block and the reinforcing rib of the present invention; Figure 4 This is a longitudinal sectional view of the reinforcing block structure of the present invention; Figure 5 This is an enlarged schematic diagram of the structure at point A of the present invention.

[0020] In the diagram: 1. Hot melt bonding sleeve body; 2. Intermediate filling layer; 3. Outer sheath layer; 4. Hot melt adhesive layer; 5. Horizontal ribs; 6. Reinforcing blocks; 7. Hemispherical stabilizing blocks; 8. Longitudinal ribs; 9. Through holes; 10. Limiting slots; 11. Limiting protrusions; 12. Thermal insulation and protective layer. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 In this embodiment of the invention, a hot-melt bonding sleeve for pipe welding joints with an insulation layer includes a hot-melt bonding sleeve body 1. The hot-melt bonding sleeve body 1 includes a hot-melt adhesive layer 4, an intermediate filling layer 2 on one side of the hot-melt adhesive layer 4, an outer sheath layer 3 on the outside of the intermediate filling layer 2, and an insulation and protective layer 12 on the outer wall of the outer sheath layer 3. A reinforcing rib is provided in the middle of the intermediate filling layer 2, and a reinforcing block 6 is provided in the middle of the hot-melt bonding sleeve body 1. The reinforcing rib includes transverse ribs 5 and longitudinal ribs 8, which are vertically fixed and welded. The transverse ribs 5 and longitudinal ribs 8 are arranged in an I-shape, and multiple sets of transverse ribs 5 and longitudinal ribs 8 are provided at equal intervals. One end of the transverse rib 5 is also fixedly welded to the outer wall of the reinforcing block 6. This increases the internal structural strength of the hot-melt bonding sleeve, greatly improves the tear resistance of the hot-melt bonding sleeve, and helps to improve the service life of the hot-melt bonding sleeve.

[0023] like Figure 1 and Figure 4As shown, limiting slots 10 and limiting protrusions 11 that can be inserted and matched are provided on both sides of the reinforcing support block 6. The reinforcing support block 6 is made of alloy support block, and multiple reinforcing support blocks 6 are provided at equal intervals. A through hole 9 is also provided in the middle of the reinforcing support block 6. The limiting slot 10 on one side of the reinforcing support block 6 is set as a rectangular slot, and the limiting protrusion 11 is set as a rectangular protrusion. When the hot melt bonding sleeve body is wrapped around the outside of the pipe welding joint, the limiting slot 10 of the reinforcing support block 6 at the interface end of the hot melt bonding sleeve body 1 is inserted into the limiting protrusion 11 of the external reinforcing support block 6 at the other end of the hot melt bonding sleeve body 1. This increases the stability of the bonding between the interface end of the hot melt bonding sleeve body 1 and the outside of the hot melt bonding sleeve body 1, and prevents the hot melt bonding sleeve body 1 from falling off due to the interface end lifting.

[0024] like Figure 2 and Figure 5 As shown, the intermediate filling layer 2 is made of radiation cross-linked polyethylene substrate, the outer sheath layer 3 is made of PE protective layer, and the thermal insulation protective layer 12 is made of EPDM rubber layer. The thermal insulation protective layer 12 is embedded in the groove on the outside of the outer sheath layer 3. The thickness of the thermal insulation protective layer 12 is half the thickness of the outer sheath layer 3, which makes the outer sheath layer 3 have excellent thermal insulation performance and increases the thermal insulation capacity of the hot melt bonded sleeve body 1.

[0025] like Figure 3 As shown, a hollow hemispherical stabilizing block 7 is also provided outside the connection between the transverse stiffener 5 and the reinforcing block 6. The hemispherical stabilizing block 7 increases the connection area between the transverse stiffener 5 and the reinforcing block 6, which facilitates the improvement of the stability of the connection between the transverse stiffener 5 and the reinforcing block 6.

[0026] Multiple reversible temperature-changing indicator strips are embedded between the thermal insulation protective layer 12 and the outer layer 3, and the temperature-changing indicator strips are arranged along the axial direction of the hot melt bonding sleeve body 1. The temperature-changing indicator strips display their original color when the temperature is below the melting temperature of the hot melt adhesive layer, and permanently change color after reaching the standard construction temperature of the hot melt adhesive, and do not return to their original color after cooling. The temperature-changing indicator strips are attached to the bottom of the groove of the outer layer 3, and their thickness is less than that of the thermal insulation protective layer 12, so as not to protrude and damage the flatness of the outer layer. The temperature-changing indicator strips are segmented to correspond to the position of a single reinforcing support block 6, and the length of each indicator strip is matched with the axial length of the reinforcing support block, so as to monitor the hot melt temperature of each plug-in locking position individually.

[0027] Multiple spiral guide grooves are opened on the inner surface of the hot melt adhesive layer 4, and the two ends of the guide grooves extend to the left and right overlapping ports of the hot melt bonding sleeve body 1; the two ends of the through hole 9 in the middle of the reinforcing block 6 are connected to the guide grooves to form a through drainage channel; the spiral guide grooves slope downward from the middle to both ends with a slope of 2°-5°, and the water accumulated at the bottom of the pipe can flow along the guide grooves to the overlapping ports of the sleeve body for discharge; a small water guide notch is opened at the bottom of the limiting slot 10, and the water accumulated in the guide grooves can pass through the water guide notch and the limiting protrusion 11 of the plug-in fit to be discharged outward.

[0028] An elastic buffer and noise reduction liner can be detachably attached to the inner side of the hot melt adhesive layer 4. The liner is made of closed-cell nitrile rubber. The two ends of the liner are equipped with buckle strips, which can be locked onto the inner edge of the reinforcing block 6 for fixation. The surface of the buffer and noise reduction liner has alignment through holes that match the flow channel, so as not to block the internal drainage channel. The thickness of the buffer and noise reduction liner is 2-4mm, which can accommodate the radial deformation caused by the thermal expansion and contraction of the pipeline and offset vibration noise.

[0029] The working principle and usage process of this invention: During use, the reinforcing block 6 is provided in the middle of the hot melt bonding sleeve body 1, and the reinforcing rib is provided in the middle of the middle filling layer 2 of the hot melt bonding sleeve body 1. One end of the transverse rib 5 of the reinforcing rib is fixedly welded to the outer wall of the reinforcing block 6, which increases the internal structural strength of the hot melt bonding sleeve, greatly improves the tear resistance of the hot melt bonding sleeve, and helps to improve the service life of the hot melt bonding sleeve.

[0030] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention 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 invention should be included within the protection scope of the present invention.

Claims

1. A hot-melt bonding sleeve for pipe welding joints with insulation layer, comprising a hot-melt bonding sleeve body (1), characterized in that: The hot melt bonding sleeve body (1) includes a hot melt adhesive layer (4), an intermediate filling layer (2) on one side of the hot melt adhesive layer (4), an outer sheath layer (3) on the outside of the intermediate filling layer (2), a heat insulation and protective layer (12) on the outer wall of the outer sheath layer (3), a reinforcing rib in the middle of the intermediate filling layer (2), a reinforcing block (6) in the middle of the hot melt bonding sleeve body (1), and a limiting slot (10) and a limiting protrusion (11) on both sides of the reinforcing block (6) respectively.

2. The pipe welding joint hot-melt bonding sleeve with insulation layer according to claim 1, characterized in that: The reinforcing block (6) is made of alloy and multiple reinforcing blocks (6) are provided at equal intervals. The reinforcing block (6) also has a through hole (9) in the center.

3. The pipe welding joint hot-melt bonding sleeve with insulation layer according to claim 2, characterized in that: The limiting slot (10) on one side of the reinforcing block (6) is configured as a rectangular slot, and the limiting protrusion (11) is configured as a rectangular protrusion.

4. The hot-melt bonding sleeve for pipe welding joints with insulation layer according to claim 1, characterized in that: The intermediate filling layer (2) is made of radiation cross-linked polyethylene substrate, the outer sheath layer (3) is made of PE protective layer, and the thermal insulation and protective layer (12) is made of EPDM rubber layer.

5. A hot-melt bonding sleeve for pipe welding joints with insulation layer according to claim 4, characterized in that: The thermal insulation protective layer (12) is embedded in the groove on the outside of the outer layer (3), and the thickness of the thermal insulation protective layer (12) is half the thickness of the outer layer (3).

6. A hot-melt bonding sleeve for pipe welding joints with insulation layer according to claim 1, characterized in that: The reinforcing ribs include transverse ribs (5) and longitudinal ribs (8), and the transverse ribs (5) and longitudinal ribs (8) are vertically fixed and welded.

7. A hot-melt bonding sleeve for pipe welding joints with insulation layer according to claim 6, characterized in that: The transverse ribs (5) and longitudinal ribs (8) are arranged in the shape of I-beams. The transverse ribs (5) and longitudinal ribs (8) are arranged in multiple groups at equal intervals. One end of the transverse rib (5) is also fixedly welded to the outer wall of the reinforcing block (6). A hemispherical stabilizing block (7) is also provided outside the connection between the transverse ribs (5) and the reinforcing block (6).

8. A hot-melt bonding sleeve for pipe welding joints with insulation layer according to claim 1, characterized in that: Multiple reversible temperature-changing indicator strips are embedded between the thermal insulation protective layer (12) and the outer layer (3). The temperature-changing indicator strips are arranged along the axial direction of the hot melt adhesive sleeve body (1). The temperature-changing indicator strips display their original color when the temperature is below the melting temperature of the hot melt adhesive layer. They permanently change color after reaching the standard construction temperature of the hot melt adhesive and do not return to their original color after cooling. The temperature-changing indicator strips are attached to the bottom of the groove of the outer layer (3) and are less than the thickness of the thermal insulation protective layer (12). The temperature-changing indicator strips are segmented to correspond to the position of a single reinforcing block (6). The length of each indicator strip is matched with the axial length of the reinforcing block, and the hot melt temperature of each plug-in locking position is monitored individually.

9. A hot-melt bonding sleeve for pipe welding joints with insulation layer according to claim 1, characterized in that: Multiple spiral guide grooves are opened on the inner surface of the hot melt adhesive layer (4), and the two ends of the guide grooves extend to the left and right overlapping ports of the hot melt bonding sleeve body (1); the two ends of the through hole (9) in the middle of the reinforcing block (6) are connected to the guide grooves to form a through drainage channel; the spiral guide grooves slope downward from the middle to both ends with a slope of 2°-5°, and the water accumulated at the bottom of the pipe can flow along the guide grooves to the overlapping ports of the sleeve body for discharge; a small water guide notch is opened at the bottom of the limiting slot (10), and the water accumulated in the guide grooves can pass through the water guide notch and the limiting protrusion (11) of the plug-in fit to be discharged outward.

10. A hot-melt bonding sleeve for pipe welding joints with insulation layer according to claim 1, characterized in that: The inner side of the hot melt adhesive layer (4) can be detachably bonded with an elastic buffer and noise reduction liner, which is made of closed-cell nitrile rubber. The two ends of the liner are provided with buckle strips, which can be locked to the inner edge of the reinforcing block (6) for fixation. The surface of the buffer and noise reduction liner is provided with alignment through holes that match the guide groove. The thickness of the buffer and noise reduction liner is 2-4mm.

Images