Pipe joint

Abstract

The utility model belongs to the technical field of pipelines, and particularly relates to a pipe joint, which comprises a hollow plastic inner pipe and a plastic outer pipe coated and formed outside the plastic inner pipe, more than two end parts are arranged on the plastic inner pipe, the end parts of the plastic outer pipe and the end parts of the plastic inner pipe are correspondingly arranged, at least one end part of the plastic inner pipe is provided with a hollow copper pipe, and the hollow copper pipe is provided with a copper wire. And the corresponding end part of the plastic outer pipe is coated and molded outside the copper pipe. The utility model is not easy to deform, and effectively prevents the liquid leakage at the joint with the pipe.

Description

Technical field:

[0001] The utility model belongs to the technical field of pipelines, in particular to a pipe joint. Background technology:

[0002] The Chinese utility model patent (publication number CN219796522U, application date 2023.05.08, publication date 2023.10.03) discloses a pipe joint, including a hollow plastic inner tube, the plastic inner tube is provided with more than two ends, the plastic inner tube is overmolded with a plastic outer tube, the material strength of the plastic outer tube is greater than the material strength of the plastic inner tube, the plastic inner tube is made of environmentally friendly plastic, and the plastic outer tube is made of anti-aging plastic. At least one end face of the plastic inner tube protrudes from the end face of the plastic outer tube, and the protruding part of the plastic inner tube is sleeved with a tube, the end face of the plastic outer tube is concave to form an annular groove for installing the tube, and the outer side wall of the plastic outer tube is provided with an external thread connected to a nut.

[0003] The disadvantages of the above pipe joint are that the plastic inner pipe is made of environmentally friendly plastic, which is soft and easily deformed, and the connection between the inner pipe and the pipe is prone to leakage. Summary of the invention:

[0004] The utility model aims to provide a pipe joint which is not easily deformed and can effectively prevent liquid leakage at the connection with the pipe.

[0005] The utility model is achieved in this way:

[0006] A pipe joint comprises a hollow plastic inner tube and a plastic outer tube overmolded on the outside of the plastic inner tube, wherein the plastic inner tube is provided with more than two ends, the ends of the plastic outer tube are arranged corresponding to the ends of the plastic inner tube, at least one end of the plastic inner tube is provided with a hollow copper tube, and the corresponding end of the plastic outer tube is overmolded on the outside of the copper tube.

[0007] In the above-mentioned pipe joint, at least one copper tube includes a positioning section inserted in the plastic inner tube, a fixing section fixedly connected to the plastic outer tube, and an assembly section connected to the tube, and the inner diameters of the positioning section, the fixing section and the assembly section are equal.

[0008] In the above-mentioned pipe joint, a mounting groove matching the positioning section is provided in the plastic inner tube.

[0009] In the above-mentioned pipe joint, a limiting convex ring for contacting and limiting the position with the plastic inner tube is provided on the outer periphery of the fixing section.

[0010] In the above-mentioned pipe joint, the corresponding end surface of the plastic outer tube is concave to form an annular groove for installing the pipe, and the outer wall of the plastic outer tube is provided with an external thread that is screwed with a nut, and a clamping sleeve that is sleeved on the pipe is provided between the nut and the pipe, and the nut is clamped and fixed to the pipe by pressing the clamping sleeve.

[0011] In the above-mentioned pipe joint, the outer diameter of the assembly section is not greater than the inner diameter of the annular groove, and an annular installation groove for installing an O-ring is provided on the assembly section.

[0012] In the above-mentioned pipe joint, there are two annular mounting grooves, and two guiding frustum surfaces are provided on the outer circumference of the assembly section. The two guiding frustum surfaces are respectively arranged on the side of the annular mounting groove away from the fixed section, and the diameter of the guiding frustum surface gradually decreases from the side close to the fixed section to the outside.

[0013] In the above-mentioned pipe joint, an annular protrusion is provided on the outer periphery of the fixing section.

[0014] In the above-mentioned pipe joint, at least one copper tube includes a small tube section inserted in a plastic inner tube and a large tube section fixedly connected to a plastic outer tube, wherein the inner diameter and outer diameter of the large tube section are respectively larger than the inner diameter and outer diameter of the small tube section, and the large tube section is provided with an internal thread screwed to the tube.

[0015] In the above-mentioned pipe joint, a mounting groove adapted to the small pipe section is provided in the plastic inner pipe.

[0016] In the above-mentioned pipe joint, an annular assembly groove is provided on the outer circumference of the large pipe section, and an assembly convex ring matching the annular assembly groove protrudes inwardly from the inner ring of the plastic outer pipe.

[0017] In the above-mentioned pipe joint, at least one copper tube includes a limiting section inserted in the plastic inner tube, a connecting section fixedly connected to the plastic outer tube, and an installation section connected to the tube, and the installation section is provided with an external thread 2 screwed to the tube.

[0018] In the above-mentioned pipe joint, a limiting ring is provided on the outer periphery of the connecting section for interfering with the plastic inner tube, the major diameter of the second external thread is larger than the outer diameter of the connecting section, a limiting groove is formed between the limiting ring and the installation section, and the inner ring of the plastic outer tube is convex to form an assembly ring that matches the limiting groove.

[0019] In the above-mentioned pipe joint, the pipe joint is a straight joint, a tee joint or an elbow.

[0020] The outstanding advantages of the utility model compared with the prior art are:

[0021] The utility model arranges a copper tube at the end of the plastic inner tube, the copper tube is connected to the tube, the copper tube is harder and not easy to deform, and the connection between the copper tube and the tube is not easy to leak; the corresponding end of the plastic outer tube is overmolded outside the copper tube and is tightly connected to the copper tube, which effectively prevents leakage between the plastic outer tube and the copper tube, and the connection is firm and easy to process. Description of the drawings:

[0022] Figure 1 It is a three-dimensional diagram of the first embodiment of the utility model;

[0023] Figure 2 It is a cross-sectional view of the first embodiment of the utility model;

[0024] Figure 3 It is an exploded view of the first embodiment of the utility model;

[0025] Figure 4 It is a three-dimensional diagram of the copper tube of the first embodiment of the utility model;

[0026] Figure 5 It is a three-dimensional diagram of the second embodiment of the utility model;

[0027] Figure 6 It is a cross-sectional view of the second embodiment of the utility model;

[0028] Figure 7 It is an exploded view of the second embodiment of the utility model;

[0029] Figure 8 It is a three-dimensional diagram of one of the copper tubes in the second embodiment of the utility model;

[0030] Fig. 9 It is a three-dimensional diagram of the third embodiment of the utility model;

[0031] Fig.10 It is a cross-sectional view of the third embodiment of the utility model;

[0032] Fig.11 It is an exploded view of the third embodiment of the utility model;

[0033] Fig.12 It is a three-dimensional diagram of one of the copper tubes in the third embodiment of the present utility model.

[0034] Figure numerals: 1, plastic inner tube; 2, plastic outer tube; 2a, annular groove; 2b, external thread one; 2c, assembly convex ring; 2d, assembly ring; 3, copper tube; 3a, positioning section; 3b, fixing section; 3c, assembly section; 3d, limiting convex ring; 3e, annular mounting groove; 3f, annular protrusion; 3g, small tube section; 3h, large tube section; 3i, internal thread; 3j, annular assembly groove; 3k, guide frustum; 3l, limiting section; 3m, connecting section; 3n, installation section; 3o, external thread two; 3p, limiting ring; 3q, limiting groove; 4, tube; 5, nut; 6, clamping sleeve; 7, O-ring. Specific implementation method:

[0035] The present invention is further described below with reference to specific embodiments. Figure 1 —12:

[0036] Example 1: See Figure 1-4 :

[0037] A pipe joint comprises a hollow plastic inner tube 1 and a plastic outer tube 2 overmolded on the outside of the plastic inner tube 1, wherein the plastic inner tube 1 is provided with more than two ends, and the ends of the plastic outer tube 2 are arranged corresponding to the ends of the plastic inner tube 1, and at least one end of the plastic inner tube 1 is provided with a hollow copper tube 3, and the corresponding end of the plastic outer tube 2 is overmolded on the outside of the copper tube 3.

[0038] The processing process of the utility model is as follows: firstly, the plastic inner tube 1 is formed, then the copper tube 3 is placed at the end of the plastic inner tube 1, and then the plastic outer tube is overmolded on the outside of the plastic inner tube 1 and the copper tube 3 by injection molding.

[0039] like Figure 1-4 As shown, the utility model arranges a copper tube 3 at the end of the plastic inner tube 1, and the copper tube 3 is connected to the tube 4. The copper tube 3 is relatively hard and not easy to deform, and the connection between the copper tube 3 and the tube 4 is not easy to leak; the corresponding end of the plastic outer tube 2 is overmolded outside the copper tube 3 and is tightly connected to the copper tube 3, which effectively prevents leakage between the plastic outer tube 2 and the copper tube 3, and the connection is firm and easy to process.

[0040] In this embodiment, the pipe joint is a three-way joint, and the three ends of the pipe joint have the same structure, and the connection structure between the three ends and the pipe 4 is also the same. Figure 2-4 As shown, the copper tube 3 includes a positioning section 3a inserted in the plastic inner tube 1, a fixing section 3b fixedly connected to the plastic outer tube 2, and an assembly section 3c connected to the tube 4, and the inner diameters of the positioning section 3a, the fixing section 3b and the assembly section 3c are equal.

[0041] Furthermore, the plastic inner tube 1 is provided with a mounting groove matched with the positioning section 3a.

[0042] In order to limit the length of the copper tube 3 entering the plastic inner tube 1 , a limiting convex ring 3d is provided on the outer periphery of the fixing section 3b for contacting and limiting the plastic inner tube 1 .

[0043] Installation structure of pipe 4: the corresponding end surface of the plastic outer pipe 2 is concave to form an annular groove 2a for installing the pipe 4, and the outer side wall of the plastic outer pipe 2 is provided with an external thread 2b screwed with the nut 5, and a clamping sleeve 6 is provided between the nut 5 and the pipe 4 and is sleeved on the pipe 4. The nut 5 clamps and fixes the pipe 4 by pressing the clamping sleeve 6.

[0044] In order to prevent liquid leakage, the outer diameter of the assembly section 3c is not larger than the inner diameter of the annular groove 2a, and an annular mounting groove 3e for mounting the O-ring 7 is provided on the assembly section 3c.

[0045] In order to guide the installation of the O-ring 7, facilitate the installation of the O-ring 7, and prevent the O-ring 7 from falling out, two annular installation grooves 3e are provided, and two guiding frustum surfaces 3k are provided on the outer periphery of the assembly section 3c. The two guiding frustum surfaces 3k are respectively arranged on the side of the annular installation groove 3e away from the fixed section 3b, and the diameter of the guiding frustum surface 3k gradually decreases from the side close to the fixed section 3b to the outside.

[0046] In order to ensure that the copper tube 3 and the plastic outer tube 2 are firmly and reliably connected, an annular protrusion 3f is provided on the outer periphery of the fixing section 3b.

[0047] Example 2: See Figure 5-8 :

[0048] The structure of this embodiment is basically the same as that of the above-mentioned embodiment 1, and the main difference is that the structure of two ends of the pipe joint is the same as that of the end of embodiment 1, and the connection structure with the pipe 4 is also the same. The structure of the other end of the pipe joint is different from that of the end of embodiment 1, and the connection structure with the pipe 4 is also different. In this embodiment, the copper tube 3 with different ends includes a small tube section 3g inserted in the plastic inner tube 1 and a large tube section 3h fixedly connected to the plastic outer tube 2, the inner diameter and outer diameter of the large tube section 3h are respectively larger than the inner diameter and outer diameter of the small tube section 3g, and the large tube section 3h is provided with an internal thread 3i threadedly connected to the pipe 4, and the large tube section 3h is threadedly connected to the pipe 4 through the internal thread 3i.

[0049] Furthermore, the plastic inner tube 1 is provided with a mounting groove adapted to the small tube section 3g.

[0050] In order to ensure a firm and reliable connection between the copper tube 3 and the plastic outer tube 2, an annular assembly groove 3j is provided on the outer circumference of the large tube section 3h, and an assembly convex ring 2c matching the annular assembly groove 3j is protruded inwardly on the inner ring of the plastic outer tube 2. Figure 6 , 8 shown.

[0051] Example 3: See Figure 9-12 :

[0052] The structure of this embodiment is basically the same as that of the above-mentioned embodiment 1, and the main difference is that the structure of two ends of the pipe joint is the same as that of the end of embodiment 1, and the connection structure with the pipe 4 is also the same. The structure of the other end of the pipe joint is different from that of the end of embodiment 1, and the connection structure with the pipe 4 is also different. In this embodiment, the copper tube 3 with different ends includes a limiting section 31 inserted in the plastic inner tube 1, a connecting section 3m fixedly connected to the plastic outer tube 2, and a mounting section 3n connected to the pipe 4, and the mounting section 3n is provided with an external thread 3o screwed to the pipe 4, and the mounting section 3n is threadedly connected to the pipe 4 through the external thread 3o.

[0053] In order to limit the length of the copper tube 3 entering the plastic inner tube 1, a limiting ring 3p is provided on the outer periphery of the connecting section 3m for limiting the contact with the plastic inner tube 1, the major diameter of the external thread 3o is larger than the outer diameter of the connecting section 3m, a limiting groove 3q is formed between the limiting ring 3p and the mounting section 3n, and an assembly ring 2d adapted to the limiting groove 3q is formed on the inner ring of the plastic outer tube 2. Fig.10 , 12 As shown, the connection between the copper tube 3 and the plastic outer tube 2 is firm and reliable.

[0054] Embodiment 4:

[0055] The structure of this embodiment is basically the same as that of the above-mentioned embodiment 1, and the main difference is that the pipe joint is a straight-through joint.

[0056] The two ends of the straight joint have the same structure as the end of the three-way joint in the first embodiment, and the connection structure with the pipe 4 is also the same.

[0057] Embodiment five:

[0058] The structure of this embodiment is basically the same as that of the above-mentioned embodiment 2, and the main difference is that the pipe joint is a straight-through joint, which lacks an end portion having the same structure as that of the end portion of embodiment 1.

[0059] Embodiment six:

[0060] The structure of this embodiment is basically the same as that of the above-mentioned embodiment 3, and the main difference is that the pipe joint is a straight-through joint, which lacks an end portion having the same structure as the end portion of the embodiment 1.

[0061] Embodiment seven:

[0062] The structure of this embodiment is basically the same as that of the fourth embodiment, and the main difference is that the pipe joint is a bent pipe.

[0063] Embodiment eight:

[0064] The structure of this embodiment is basically the same as that of the above-mentioned embodiment 5, and the main difference is that the pipe joint is a bent pipe.

[0065] Embodiment nine:

[0066] The structure of this embodiment is basically the same as that of the sixth embodiment, and the main difference is that the pipe joint is a bent pipe.

[0067] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A pipe joint, comprising a hollow plastic inner tube (1) and a plastic outer tube (2) overmolded on the plastic inner tube (1), wherein the plastic inner tube (1) is provided with two or more ends, and the ends of the plastic outer tube (2) are arranged corresponding to the ends of the plastic inner tube (1), characterized in that: At least one end of the plastic inner tube (1) is provided with a hollow copper tube (3), and the corresponding end of the plastic outer tube (2) is overmolded outside the copper tube (3).

2. A pipe joint according to claim 1, characterized in that: At least one copper tube (3) comprises a positioning section (3a) inserted into a plastic inner tube (1), a fixing section (3b) fixedly connected to a plastic outer tube (2), and an assembly section (3c) connected to a tube (4); the inner diameters of the positioning section (3a), the fixing section (3b) and the assembly section (3c) are equal.

3. A pipe joint according to claim 2, characterized in that: The outer periphery of the fixing section (3b) is provided with a limiting convex ring (3d) for contacting and limiting the position of the plastic inner tube (1).

4. A pipe joint according to claim 2, characterized in that: The corresponding end surface of the plastic outer tube (2) is concave to form an annular groove (2a) for mounting the tube (4); the outer wall of the plastic outer tube (2) is provided with an external thread (2b) which is screwed to the nut (5); a clamping sleeve (6) which is sleeved on the tube (4) is provided between the nut (5) and the tube (4); the nut (5) clamps and fixes the tube (4) by pressing the clamping sleeve (6).

5. A pipe joint according to claim 4, characterized in that: The outer diameter of the assembly section (3c) is not greater than the inner diameter of the annular groove (2a), and an annular mounting groove (3e) for mounting an O-ring (7) is provided on the assembly section (3c).

6. A pipe joint according to claim 1, characterized in that: At least one copper tube (3) comprises a small tube section (3g) inserted into a plastic inner tube (1) and a large tube section (3h) fixedly connected to a plastic outer tube (2); the inner diameter and outer diameter of the large tube section (3h) are respectively larger than the inner diameter and outer diameter of the small tube section (3g); and the large tube section (3h) is provided with an internal thread (3i) threadedly connected to a tube (4).

7. A pipe joint according to claim 6, characterized in that: The outer circumference of the large pipe section (3h) is provided with an annular assembly groove (3j), and the inner ring of the plastic outer pipe (2) protrudes inwardly with an assembly convex ring (2c) that matches the annular assembly groove (3j).

8. A pipe joint according to claim 1, characterized in that: At least one copper tube (3) comprises a limiting section (31) inserted into a plastic inner tube (1), a connecting section (3m) fixedly connected to a plastic outer tube (2), and a mounting section (3n) connected to a tube (4); the mounting section (3n) is provided with an external thread (3o) screwed to the tube (4).

9. A pipe joint according to claim 8, characterized in that: The outer periphery of the connecting section (3m) is provided with a limiting ring (3p) for limiting the position against the plastic inner tube (1); the major diameter of the second external thread (3o) is larger than the outer diameter of the connecting section (3m); a limiting groove (3q) is formed between the limiting ring (3p) and the mounting section (3n); and the inner ring of the plastic outer tube (2) is convex to form an assembly ring (2d) that matches the limiting groove (3q).

10. A pipe joint according to claim 1, characterized in that: The pipe joint is a straight joint, a three-way joint or an elbow.

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