A copper-plastic composite pipe connecting method and a pipe connecting structure

Abstract

The application discloses a pipeline connecting structure, which comprises a copper-plastic composite pipe, a connecting fixing piece and a connecting sealing ring. The copper-plastic composite pipe comprises a copper lining pipe layer and a pipeline plastic layer wrapped outside the copper lining pipe layer. The two ends of the copper lining pipe layer are provided with connecting ports. An annular lower groove is formed on the outer surface of the end of the connecting port away from the copper lining pipe layer. The connecting piece comprises a transition part and connecting ends arranged at the two ends of the transition part. The connecting ends comprise first connecting parts away from the transition part and second connecting parts close to the transition part. The first connecting parts are used for being matched with the connecting ports. The first connecting parts comprise first connecting copper pipe layers, second connecting copper pipe layers and first connecting plastic pipe layers wrapped outside the second connecting copper pipe layers. The first connecting copper pipe layers and the second connecting copper pipe layers form annular connecting grooves for the connecting ports to enter. An annular upper groove matched with the annular lower groove is formed on the inner wall of the second connecting copper pipe layer. The connecting sealing ring is arranged between the annular lower groove and the annular upper groove.

Description

Technical Field

[0001] This invention relates to the field of pipe technology, and in particular to a copper-plastic composite pipe connection method and pipe connection structure. Background Technology

[0002] Copper-plastic composite pipes and matching fittings are a new type of water supply pipe material. The composite copper-plastic water supply pipe consists of a thin-walled seamless copper inner lining and an outer plastic layer. There are two types of fittings: one with a seamless copper inner lining and an outer plastic layer, and the other with seamless pure copper fittings. Traditional PPR water supply pipes are prone to scaling and bacterial growth during water supply, and are susceptible to aging and deformation, and even plasticizer leaching, when transporting hot water. Composite copper-plastic pipes solve these problems due to the properties of copper, and their extremely high cost-effectiveness makes them the preferred choice for future water supply pipes.

[0003] Currently, composite copper-plastic water supply pipes and their matching fittings are all connected by hot-melt welding of the outer plastic layer. There are two connection methods between the copper lining of the pipe and fitting: butt-fitting or socket-fitting. Butt-fitting involves a simple butt joint between the copper-plastic pipe and the copper lining of the fitting; socket-fitting involves the outer diameter of the copper lining in the fitting being slightly smaller than the inner diameter of the copper-plastic pipe, with the copper lining inserted into the inner wall of the fitting. Furthermore, during the hot-melt process, the outer plastic layer may leak out through the joint gaps, but this phenomenon cannot be observed by operators during the hot-melt process, making it difficult to guarantee true all-copper contact with water. Summary of the Invention

[0004] The purpose of this invention is to provide a pipe connection structure that has the advantages of simple structure, good sealing performance, avoiding plastic seepage during the hot melting process, and ensuring that all copper is in contact with water.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] A pipe connection structure includes: a copper-plastic composite pipe, a connecting fastener, and a connecting sealing ring. The copper-plastic composite pipe includes an inner copper pipe layer and a pipe plastic layer covering the outer side of the inner copper pipe layer. Connecting ports are provided at both ends of the inner copper pipe layer. A lower annular groove is formed on the outer surface of the end of the connecting port away from the inner copper pipe layer. The connecting fastener includes a transition portion and connecting ends at both ends of the transition portion. Each connecting end includes a first connecting portion away from the transition portion and a second connecting portion close to the transition portion. The first connecting portion is used to mate with the connecting port. The first connecting portion includes a first connecting copper pipe layer and a second connecting copper pipe layer, and a first connecting plastic pipe layer covering the outer side of the second connecting copper pipe layer. An annular connecting groove for the connecting port to enter is formed between the first and second connecting copper pipe layers. An upper annular groove is formed on the inner wall of the second connecting copper pipe layer to mate with the lower annular groove. The connecting sealing ring is disposed between the lower and upper annular grooves. The length of the connecting port is less than the depth of the annular connecting groove.

[0007] One end of the second connecting copper tube layer near the second connecting part is connected to the first connecting copper tube layer and forms an observation slope. Several observation ports are opened on the observation slope along the circumference of the observation slope.

[0008] The second connecting part includes a third connecting copper tube layer connected to the first connecting copper tube layer. An observation copper tube layer is rotatably connected to the outside of the third connecting copper tube layer. An observation groove is provided on the observation copper tube layer. When the observation copper tube layer is rotated so that the observation groove is directly opposite the observation port, the observation groove communicates with the observation port. The observation groove is used for the operator to observe the bottom of the annular connecting groove. The outside of the observation copper tube layer, except for the observation groove, is covered with an observation plastic tube layer.

[0009] Further configuration: The thickness of the observed plastic tube layer is greater than the thickness of the first connecting plastic tube layer.

[0010] Further configuration: The outer surface of the connection port is also provided with a guide vertical groove and a limiting horizontal groove arranged perpendicularly to each other. The guide vertical groove is located on the side of the lower annular groove near the inner copper tube layer, and one end of the guide vertical groove is connected to the lower annular groove, and the other end is connected to the limiting horizontal groove. A positioning protrusion is provided on the inner wall of the second connecting copper tube layer. The limiting horizontal groove and the guide vertical groove are both used for the positioning protrusion to enter.

[0011] Further configuration: The depth of the observation groove gradually increases from the end furthest from the observation port to the end closest to the observation port.

[0012] Further configuration: A guide slope is formed at the end of the first connecting copper tube layer away from the second connecting part.

[0013] Further configuration: A hook-groove structure is formed on the outer surface of the observation copper tube layer, and the observation plastic tube layer covers the hook-groove structure. The hook-groove structure is used to allow the molten observation plastic tube layer to enter.

[0014] A method for connecting copper-plastic composite pipes, comprising the pipe connection structure described above, and the specific steps are as follows:

[0015] S1: Prepare copper-plastic composite pipe, connecting fasteners and connecting sealing rings, and embed the connecting sealing rings into the annular groove;

[0016] S2: Insert the connector of the copper-plastic composite pipe into the annular connecting groove, and at the same time, make the positioning protrusion move from the lower annular groove into the guide vertical groove until the positioning protrusion moves to the end of the guide vertical groove away from the lower annular groove. At this time, the connecting sealing ring is embedded in the lower annular groove.

[0017] S3: Rotate the first connecting copper tube layer to make the positioning protrusion enter the limiting transverse groove to complete the initial positioning;

[0018] S4: Weld the pipe plastic layer and the first connecting plastic pipe layer to form the first welded layer;

[0019] S5: Rotate the third connecting copper tube layer to connect the observation groove with multiple observation ports in sequence, and observe the overflow situation at the bottom of the annular connecting groove in each observation port to see if plastic seeps into the bottom of the groove. If overflowing plastic is observed in any observation port, separate the copper-plastic composite tube and the connecting fastener and repeat steps S1-S5; if no overflowing plastic is observed in any observation port, rotate the third connecting copper tube to be misaligned with any observation port and proceed to step S6.

[0020] S6: Weld the observation plastic tube layer and the first weld layer together, and fill the observation groove to form the second weld layer to complete the connection.

[0021] In summary, the present invention has the following beneficial effects: the annular connecting groove allows the connector to be inserted, ensuring that the first and second connecting copper tube layers abut against the outer and inner surfaces of the connector, respectively, guaranteeing the sealing of the connection between the connecting fastener and the copper-plastic composite pipe. The upper and lower annular grooves and the connecting sealing ring further improve the sealing performance. After the connection is completed, the first connecting part and the copper-plastic composite pipe are first heat-fused and fixed. Simultaneously, the completion status of the first weld layer can be observed through the observation groove of the second connecting part to check for plastic seepage. If plastic seepage is observed, the connection can be removed and re-established; otherwise, a second round of welding can be performed to form the second weld layer, completing the overall connection and fixing. The actual welding process can be observed to prevent plastic seepage and ensure the goal of achieving full copper water contact is achieved. Attached Figure Description

[0022] Figure 1This is a cross-sectional view of the overall structure of the embodiment;

[0023] Figure 2 This is a magnified view of point A in the diagram;

[0024] Figure 3 This is a schematic diagram of the structure of the guide vertical groove and the limiting horizontal groove in the embodiment.

[0025] In the diagram, 1. Inner copper pipe lining layer; 2. Pipe plastic layer; 3. Connection port; 4. Transition section; 5. First connection section; 6. Second connection section; 7. Limiting horizontal groove; 8. Guide vertical groove; 51. First connecting copper pipe layer; 52. Second connecting copper pipe layer; 53. Annular connecting groove; 54. Lower annular groove; 55. Upper annular groove; 56. Observation port; 57. First connecting plastic pipe layer; 58. Positioning protrusion; 61. Third connecting copper pipe layer; 62. Observation copper pipe layer; 63. Observation groove; 64. Observation plastic pipe layer; 65. Hook groove structure. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Example:

[0028] like Figure 1 As shown, a pipe connection structure includes: a copper-plastic composite pipe, a connecting fastener, and a connecting sealing ring. The copper-plastic composite pipe includes an inner copper pipe layer and a pipe plastic layer covering the outer side of the inner copper pipe layer. Connecting ports are provided at both ends of the inner copper pipe layer. A lower annular groove is formed on the outer surface of the end of the connecting port away from the inner copper pipe layer. The connecting fastener includes a transition portion and connecting ends provided at both ends of the transition portion. The connecting ends include a first connecting portion away from the transition portion and a second connecting portion close to the transition portion. The first connecting portion is used to mate with the connecting port. The first connecting portion includes a first connecting copper pipe layer and a second connecting copper pipe layer, and a first connecting plastic pipe layer covering the outer side of the second connecting copper pipe layer. An annular connecting groove for the connecting port to enter is formed between the first connecting copper pipe layer and the second connecting copper pipe layer. An upper annular groove is formed on the inner wall of the second connecting copper pipe layer to mate with the lower annular groove. The connecting sealing ring is disposed between the lower annular groove and the upper annular groove. The length of the connecting port is less than the depth of the annular connecting groove.

[0029] One end of the second connecting copper tube layer near the second connecting part is connected to the first connecting copper tube layer and forms an observation slope. Several observation ports are opened on the observation slope along the circumference of the observation slope.

[0030] The second connecting part includes a third connecting copper tube layer connected to the first connecting copper tube layer. An observation copper tube layer is rotatably connected to the outside of the third connecting copper tube layer. An observation groove is provided on the observation copper tube layer. When the observation copper tube layer is rotated so that the observation groove is directly opposite the observation port, the observation groove communicates with the observation port. The observation groove is used for the operator to observe the bottom of the annular connecting groove. The outside of the observation copper tube layer, except for the observation groove, is covered with an observation plastic tube layer.

[0031] The thickness of the observation plastic tube layer is greater than the thickness of the first connecting plastic tube layer. The thicker observation plastic tube layer ensures that the plastic can completely fill the observation groove during hot melting to fix the third connecting copper tube layer, thus improving stability.

[0032] The outer surface of the connector is also provided with mutually perpendicular guide vertical grooves and limiting horizontal grooves. The guide vertical groove is located on the side of the lower annular groove near the inner copper tube layer, with one end communicating with the lower annular groove and the other end communicating with the limiting horizontal groove. A positioning protrusion is provided on the inner wall of the second connecting copper tube layer. Both the limiting horizontal groove and the guide vertical groove are used to allow the positioning protrusion to enter. The limiting horizontal groove, guide vertical groove, and positioning protrusion are used for preliminary fixing and positioning before hot melting to ensure the accuracy of the connection.

[0033] The depth of the observation groove gradually increases from the end furthest from the observation port to the end closest to the observation port, making it easier for operators to observe.

[0034] A guide slope is formed at the end of the first connecting copper tube layer away from the second connecting part.

[0035] A hook-groove structure is also formed on the outer surface of the observation copper tube layer, and the observation plastic tube layer covers the hook-groove structure. The hook-groove structure is used to allow the molten observation plastic tube layer to enter.

[0036] A method for connecting copper-plastic composite pipes, comprising the pipe connection structure described above, and the specific steps are as follows:

[0037] S1: Prepare copper-plastic composite pipe, connecting fasteners and connecting sealing rings, and embed the connecting sealing rings into the annular groove;

[0038] S2: Insert the connector of the copper-plastic composite pipe into the annular connecting groove, and at the same time, make the positioning protrusion move from the lower annular groove into the guide vertical groove until the positioning protrusion moves to the end of the guide vertical groove away from the lower annular groove. At this time, the connecting sealing ring is embedded in the lower annular groove.

[0039] S3: Rotate the first connecting copper tube layer to make the positioning protrusion enter the limiting transverse groove to complete the initial positioning;

[0040] S4: Weld the pipe plastic layer and the first connecting plastic pipe layer to form the first welded layer;

[0041] S5: Rotate the third connecting copper tube layer to connect the observation groove with multiple observation ports in sequence, and observe the overflow situation at the bottom of the annular connecting groove in each observation port to see if plastic seeps into the bottom of the groove. If overflowing plastic is observed in any observation port, separate the copper-plastic composite tube and the connecting fastener and repeat steps S1-S5; if no overflowing plastic is observed in any observation port, rotate the third connecting copper tube to be misaligned with any observation port and proceed to step S6.

[0042] S6: Weld the observation plastic tube layer and the first weld layer together, and fill the observation groove to form the second weld layer to complete the connection.

[0043] The annular connecting groove allows the connector to be inserted, ensuring that the first and second connecting copper tube layers abut against the outer and inner surfaces of the connector, respectively. This guarantees a tight seal between the connector and the copper-plastic composite pipe. The upper and lower annular grooves, along with the connecting sealing ring, further enhance the seal. After connection, the first connecting part and the copper-plastic composite pipe are heat-fused together for fixation. Simultaneously, the completion of the first weld layer can be observed through the observation groove in the second connecting part to check for plastic seepage. If seepage is observed, the connection can be removed and re-established. If not, a second round of welding can be performed to form the second weld layer, completing the overall connection. This allows for observation of the actual welding process, ensuring that plastic seepage is avoided and achieving the goal of full copper water contact.

[0044] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A pipe connection structure, characterized in that, include: The copper-plastic composite pipe includes a copper liner and a plastic pipe layer covering the copper liner. Both ends of the copper liner have connection ports. A lower annular groove is formed on the outer surface of the end of each connection port furthest from the copper liner. The connection port includes a transition portion and connection ends at both ends of the transition portion. Each connection end includes a first connection portion furthest from the transition portion and a second connection portion near the transition portion. The first connection portion mates with the connection port and includes a first connecting copper liner and a second connecting copper liner, as well as a first plastic pipe layer covering the second connecting copper liner. An annular connection groove is formed between the first and second connecting copper liner layers to allow the connection port to enter. An upper annular groove mates with the lower annular groove is formed on the inner wall of the second connecting copper liner. The connection sealing ring is located between the lower and upper annular grooves. The length of the connection port is less than the depth of the annular connection groove. One end of the second connecting copper tube layer near the second connecting part is connected to the first connecting copper tube layer and forms an observation slope. Several observation ports are opened on the observation slope along the circumference of the observation slope. The second connecting part includes a third connecting copper tube layer connected to the first connecting copper tube layer. An observation copper tube layer is rotatably connected to the outside of the third connecting copper tube layer. An observation groove is provided on the observation copper tube layer. When the observation copper tube layer is rotated so that the observation groove is directly opposite the observation port, the observation groove communicates with the observation port. The observation groove is used for the operator to observe the bottom of the annular connecting groove. The outside of the observation copper tube layer, except for the observation groove, is covered with an observation plastic tube layer.

2. The pipe connection structure according to claim 1, characterized in that, The thickness of the observed plastic tube layer is greater than the thickness of the first connecting plastic tube layer.

3. The pipe connection structure according to claim 1, characterized in that, The outer surface of the connection port is also provided with a guide vertical groove and a limiting horizontal groove arranged perpendicularly to each other. The guide vertical groove is located on the side of the lower annular groove near the inner copper tube layer, and one end of the guide vertical groove is connected to the lower annular groove, and the other end is connected to the limiting horizontal groove. A positioning protrusion is provided on the inner wall of the second connecting copper tube layer. The limiting horizontal groove and the guide vertical groove are both used for the positioning protrusion to enter.

4. The pipe connection structure according to claim 1, characterized in that, The depth of the observation groove gradually increases from the end furthest from the observation port to the end closest to the observation port.

5. A pipe connection structure according to claim 1, characterized in that, A guide slope is formed at the end of the first connecting copper tube layer away from the second connecting part.

6. A pipe connection structure according to claim 1, characterized in that, A hook-groove structure is also formed on the outer surface of the observation copper tube layer, and the observation plastic tube layer covers the hook-groove structure. The hook-groove structure is used to allow the molten observation plastic tube layer to enter.

7. A method for connecting copper-plastic composite pipes, characterized in that, The copper-plastic composite pipe has the pipe connection structure as described in claim 3, and the specific steps are as follows: S1: Prepare copper-plastic composite pipe, connecting fasteners and connecting sealing rings, and embed the connecting sealing rings into the annular groove; S2: Insert the connector of the copper-plastic composite pipe into the annular connecting groove, and at the same time, make the positioning protrusion move from the lower annular groove into the guide vertical groove until the positioning protrusion moves to the end of the guide vertical groove away from the lower annular groove. At this time, the connecting sealing ring is embedded in the lower annular groove. S3: Rotate the first connecting copper tube layer to make the positioning protrusion enter the limiting transverse groove to complete the initial positioning; S4: Weld the pipe plastic layer and the first connecting plastic pipe layer to form the first welded layer; S5: Rotate the third connecting copper tube layer to connect the observation groove with multiple observation ports in sequence, and observe the overflow situation at the bottom of the annular connecting groove in each observation port to see if plastic seeps into the bottom of the groove. If overflowing plastic is observed in any observation port, separate the copper-plastic composite tube and the connecting fastener and repeat steps S1-S5; if no overflowing plastic is observed in any observation port, rotate the third connecting copper tube to be misaligned with any observation port and proceed to step S6. S6: Weld the observation plastic tube layer and the first weld layer together, and fill the observation groove to form the second weld layer to complete the connection.

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