Composite pipe fitting connector

Abstract

The utility model relates to the field of water pipe connecting pieces, and particularly discloses a composite pipe fitting connector which comprises a metal pipe core, the metal pipe core comprises a first end and a second end which are opposite, a pipe hole is formed in the first end and the second end in a penetrating mode, the second end is coated with an injection molding part, and a first ring groove and a second ring groove are formed in the outer side and the inner side of the metal pipe core respectively. The metal pipe core is provided with two layers of tooth-shaped structures, so that the fixing strength between the injection molding part and the metal pipe core can be enhanced, large drawing force can be borne, the insert block protruding outwards is arranged at the second end and can be embedded into the injection molding part, relative rotation between the injection molding part and the metal pipe core is prevented, and the service life of the metal pipe core is prolonged. Therefore, the connection strength between the two parts is improved, and the service life of the composite pipe connector is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of water pipe connectors, and specifically relates to a composite pipe connector. Background Technology

[0002] Composite pipe fittings typically consist of a stainless steel or copper core connected to a PPR (polypropylene) injection molded part via injection molding. This allows for a connection at one end to a threaded water pipe and at the other end to a PPR water pipe via heat fusion or adhesive bonding. Currently, most composite pipe fittings on the market only connect the metal core and the injection molded part through an annular groove structure on the outer wall of the metal core to prevent detachment. However, under significant tensile and torsional forces, due to limited fixing force on one side of the annular groove and aging, relative rotation and loosening often occur between the two, leading to reduced connection strength and service life.

[0003] Patent document with application number "CN2017202542013" discloses a water pipe connector, including a pipe body with an internal cavity and a protective plastic layer on the outside of the pipe body. The connector is characterized by: multiple annular reinforcing rings formed on the outer wall of the pipe body; an annular protrusion ring at the top of the pipe body; and a retaining protrusion ring at the bottom of the pipe body, the outer wall of which forms an inclined wall; an annular retaining ring is provided at the bottom of the inner wall of the cavity near the retaining protrusion ring, the upper end face of which is flat, and the lower end face of which forms an annular groove, with inclined grooves formed on both sides of the annular groove. Although this prior art document can solve the leakage problem through the retaining protrusion ring, simply setting reinforcing rings on the outer wall of the pipe body still cannot improve the anti-detachment effect, nor can it limit the relative rotation between the pipe body and the protective plastic layer.

[0004] The above background information is provided only to assist in understanding the utility model concept and technical solution of this utility model, and it does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0005] The purpose of this utility model is to provide a composite pipe fitting connector that overcomes the problem that existing pipe fitting connectors, where the metal core and the injection-molded part are only fixed by a single-sided annular groove, are prone to relative rotation, pulling, and loosening when aged or subjected to large forces, resulting in reduced connection strength and service life.

[0006] To achieve the above objectives, this utility model provides a composite pipe connector, including a metal core and an injection-molded part. The metal core includes a first end and a second end opposite to each other, and a pipe hole is formed through the first end and the second end. The outer side of the first end is provided with an external thread. The injection-molded part is wrapped around the second end. A first annular groove is formed on the outer side of the second end. The number of first annular grooves is two or more and they are spaced apart along the axis of the metal core. A second annular groove is formed on the hole wall near the second end. The number of second annular grooves is two or more and they are spaced apart along the axis of the metal core. A plurality of inserts are provided on the end face of the second end. The ends of each insert protrude outward and are evenly distributed with the axis of the pipe hole as the center. The first annular groove, the second annular groove, and the inserts are all covered within the injection-molded part.

[0007] Preferably, in the above technical solution, a spacer is provided between each of the first annular grooves, and the position of the second annular groove corresponds to the position of the spacer.

[0008] Preferably, in the above technical solution, the outer side of the second annular groove approaches the outer wall of the interval portion, and the inner side of the first annular groove approaches the inner wall of the pipe hole.

[0009] Preferably, in the above technical solution, the injection molding part includes an outer part and an inner part. The outer part is arranged around the outer periphery of the inner part. A through hole is opened in the middle of the inner part. The axis of the through hole coincides with the axis of the tube hole. A second convex ring is provided on the outer periphery of the inner part. A first convex ring is provided on the inner side of the outer part. The second convex ring is engaged with the second ring groove, and the first convex ring is engaged with the first ring groove.

[0010] Preferably, in the above technical solution, a nesting part is provided on the outer side near the second end, the diameter of the nesting part is larger than the diameter of the first end, the nesting part is located between the outer part and the inner part, and a shoulder surface is provided on the end of the nesting part facing the first end, and the end face of the outer part is flush with the shoulder surface.

[0011] Preferably, in the above technical solution, the inner side of the tube hole is provided with a first stepped surface, and the first stepped surface abuts against the end face of the inner package.

[0012] Preferably, in the above technical solution, the outer periphery of the metal core is further provided with an external hexagonal surface, which is located between the external thread and the nested portion.

[0013] Preferably, in the above technical solution, the two sides of the insert are provided with limiting surfaces, and the included angle between the limiting surfaces and the end face of the second end is not greater than 90 degrees.

[0014] Preferably, in the above technical solution, the outer wall of the metal core is provided with a first column groove, the first column groove is perpendicular to the first annular groove and passes through each of the first annular grooves, one end of the first column groove extends outward from the end face of the second end, and the second annular groove communicates with the side of the first column groove.

[0015] Preferably, in the above technical solution, the inner wall of the tube hole is provided with a second column groove, the second column groove is perpendicular to the second annular groove and passes through each of the second annular grooves, one end of the second column groove extends outward from the end face of the second end, and the first annular groove communicates with the side of the second column groove.

[0016] Compared with existing technologies, this utility model has the following beneficial effects:

[0017] 1. The metal core of this utility model has a first annular groove and a second annular groove on its outer and inner sides, respectively, and has a two-layer toothed structure, which can enhance the fixing strength between the injection molding part and the metal core, so as to withstand a large pull force. Furthermore, by setting an outward protruding insert at the second end, it can be embedded into the injection molding part, thereby preventing relative rotation between the injection molding part and the metal core, thus improving the connection strength between the two and the service life of the connector.

[0018] 2. In this utility model, a spacer is provided between each of the first annular grooves. The outer side of the second annular groove approaches the outer wall of the spacer, and the inner side of the first annular groove approaches the inner wall of the tube hole. From the cross-section, the first annular groove and the second annular groove form a meandering labyrinth-shaped channel structure. This structure can maximize the depth of the first annular groove and the second annular groove under the premise of thin wall thickness, thereby further improving the anti-loosening effect. In addition, the staggered setting of the first annular groove and the second annular groove can also reduce the difficulty of processing the annular groove.

[0019] 3. In this utility model, the outer diameter of the nested part is larger than the diameter of the first end, so that the area near the second end of the tube hole can have a larger accommodating space to make way for the inner packaging part of the injection molding part, thereby making the material of the inner packaging part thicker and stronger.

[0020] 4. The outer wall of the metal core in this invention has a first groove, and the inner wall of the tube hole has a second groove. This further limits the torsional direction of the inner and outer parts of the injection molding section, thereby enabling it to withstand greater torsional force. At the same time, the side of the first groove is connected to the second annular groove, and the side of the second groove is connected to the first annular groove. Thus, the first groove, the second groove, the first annular groove, and the second annular groove form an interconnected structure. This not only allows for better material flow and venting during the injection molding process, preventing air bubbles from accumulating in the corners of the first and second annular grooves and improving injection molding quality, but also allows plastic to be injected into the interconnected area between the second and first annular grooves, thereby resisting pulling and making it difficult to separate from the metal core even if the injection molding section ages. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the composite pipe fitting connector in Example 1.

[0022] Figure 2 This is a partial cross-sectional view of the composite pipe fitting connector in Example 1.

[0023] Figure 3 This is a partial cross-sectional view of the metal core in Example 1.

[0024] Figure 4 This is a partial cross-sectional view of the injection molding part in Example 1.

[0025] Figure 5 This is a structural diagram of another embodiment of the metal core in Example 1.

[0026] Explanation of key figure labels:

[0027] 100-Metal core, 110-First end, 120-Second end, 130-Tube hole, 131-First stepped surface, 140-External thread, 150-Nested part, 151-Shoulder surface, 160-External hexagonal surface;

[0028] 200 - Injection part, 210 - Outer part, 220 - Inner part, 230 - Through hole, 240 - First convex ring, 250 - Second convex ring;

[0029] 300 - First annular groove, 310 - Spacer section;

[0030] 400 - Second annular groove;

[0031] 500 - Insert, 510 - Limiting surface;

[0032] 600 - First column groove;

[0033] 700 - Second column groove. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Where the terms "first," "second," and "third" are used for descriptive purposes and to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0038] Example 1

[0039] like Figures 1 to 4As shown, the composite pipe connector in this embodiment includes: a metal core 100, a first end 110, a second end 120, a pipe hole 130, a first stepped surface 131, an external thread 140, a nested part 150, a shoulder surface 151, an external hexagonal surface 160, an injection molded part 200, an outer wrapping part 210, an inner wrapping part 220, a through hole 230, a first convex ring 240, a second convex ring 250, a first annular groove 300, a spacer part 310, a second annular groove 400, an insert 500, a limiting surface 510, a first column groove 600, and a second column groove 700.

[0040] The metal core 100 includes a first end 110 and a second end 120, with a tube hole 130 extending through both ends. An external thread 140 is provided on the outer side of the first end 110, and a first annular groove 300 is provided on the outer side of the second end 120. There are three first annular grooves 300, spaced equally along the axial direction of the metal core 100, with a spacer 310 separating each groove. Two or more second annular grooves 400 are provided on the wall of the tube hole 130 near the second end 120, spaced at intervals along the axial direction of the metal core 100. The positions of the second annular grooves 400 correspond to the positions of the spacers 310, with the outer side of the second annular grooves 400 approaching the outer wall of the spacer 310. The inner side approaches the inner wall of the tube hole 130, thereby forming a meandering labyrinth-like structure at the cross-sections of the first annular groove 300 and the second annular groove 400. The cross-sections of the first annular groove 300 and the second annular groove 400 are both rectangular. This structure can maximize the depth of the first annular groove 300 and the second annular groove 400 under the premise of thin wall thickness, thereby further improving the anti-loosening effect. The staggered setting of the first annular groove 300 and the second annular groove 400 can also reduce the difficulty of processing the annular grooves. Six inserts 500 are provided on the end face of the second end 120. The ends of each insert 500 protrude outward and are evenly distributed with the axis of the tube hole 130 as the center. The injection molding part 200 wraps around the second end 120 through the injection molding process and covers the first annular groove 300, the second annular groove 400 and the inserts 500 inside.

[0041] More specifically, the injection molding part 200 includes an outer casing 210 and an inner casing 220. The outer casing 210 is disposed around the outer periphery of the inner casing 220. A through hole 230 is formed in the middle of the inner casing 220, and the axis of the through hole 230 coincides with the axis of the tube hole 130. A second protruding ring 250 is provided on the outer periphery of the inner casing 220, and a first protruding ring 240 is provided on the inner side of the outer casing 210. The second protruding ring 250 engages with a second annular groove 400, and the first protruding ring 240 engages with a first annular groove 300. A nesting part 150 is provided on the outer side of the metal core 100 near the second end 120. The diameter of the tube hole 130 is larger than that of the first end 110, so that the area of ​​the tube hole 130 near the second end 120 can have a larger accommodating space to make way for the inner packaging 220 of the injection molding part 200, thereby making the material of the inner packaging 220 thicker and stronger; the nesting part 150 is sandwiched between the outer packaging part 210 and the inner packaging part 220, and the end of the nesting part 150 facing the first end 110 is provided with a shoulder surface 151. The end face of the outer packaging part 210 is flush with the shoulder surface 151. A first stepped surface 131 is provided on the inner side of the tube hole 130, and the first stepped surface 131 abuts against the end face of the inner packaging part 220.

[0042] In addition, an external hexagonal surface 160 is provided on the outer periphery of the metal core 100. The external hexagonal surface 160 is located between the external thread 140 and the nested part 150 to facilitate the positioning of the wrench.

[0043] More specifically, the insert 500 is provided with limiting surfaces 510 on both sides. The angle between the limiting surface 510 and the end face of the second end 120 can be a right angle or an acute angle. When the angle between the limiting surface 510 and the end face of the second end 120 is an acute angle, it can pull the injection part 200 in the axial direction of the metal core 100, so as to better prevent the two from separating from each other.

[0044] In addition, such as Figure 5As shown, the metal core 100 in the composite pipe connector of this embodiment has another implementation: the outer wall of the metal core 100 is provided with a first column groove 600, which is perpendicular to the first annular groove 300 and passes through each of the first annular grooves 300. One end of the first column groove 600 extends outward from the end face of the second end 120 to form a notch. The second annular groove 400 is connected to the side of the first column groove 600, and the cross-section of the first column groove 600 is a semi-circular structure. A second column groove 700 is provided on the inner wall of the pipe hole 130, which is perpendicular to the second annular groove 400 and passes through each of the second annular grooves 400. One end of the second column groove 700 extends outward from the end face of the second end 120 to form a notch. The first annular groove 300 is connected to the side of the second column groove 700, and the cross-section of the second column groove 700 is a semi-circular structure. During injection molding, the injection part 200 can connect the first column groove and the second column groove. The area of ​​groove 700 is filled. The arrangement of the first column groove 600 and the second column groove 700 can further limit the torsional direction of the inner 220 and outer 210 of the injection molding part 200, thereby enabling it to withstand greater torsional force. At the same time, the side of the first column groove 600 is connected to the second annular groove 400, and the side of the second column groove 700 is connected to the first annular groove 300. Thus, the first column groove 600, the second column groove 700, the first annular groove 300 and the second annular groove 400 form an interconnected structure. This not only allows for better material flow and venting during the injection molding process, preventing air bubbles from accumulating in the corners of the first annular groove 300 and the second annular groove 400 and improving injection molding quality, but also allows plastic to be injected into the interconnected area between the second annular groove 400 and the first annular groove 300, thereby providing resistance to pulling. Even if the injection molding part 200 ages, it is difficult to separate from the metal core 100.

[0045] In summary, the metal core 100 in this embodiment has a first annular groove 300 and a second annular groove 400 on its outer and inner sides, respectively, and has a two-layer toothed structure, which can enhance the fixing strength between the injection molding part 200 and the metal core 100 so as to withstand a large pulling force. Furthermore, by providing an outwardly protruding insert 500 at the second end 120, it can be embedded into the injection molding part 200, thereby preventing relative rotation between the injection molding part 200 and the metal core 100, thereby improving the connection strength between the two and the service life of the connector.

[0046] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A composite pipe fitting connector, comprising a metal core and an injection-molded portion, wherein the metal core includes a first end and a second end opposite to each other, a pipe hole is formed through the first end and the second end, an external thread is provided on the outer side of the first end, and the injection-molded portion is wrapped around the second end, characterized in that: A first annular groove is formed on the outer side of the second end. There are two or more first annular grooves, which are spaced apart along the axis of the metal core. A second annular groove is formed on the hole wall near the second end of the tube hole. There are two or more second annular grooves, which are spaced apart along the axis of the metal core. Several inserts are provided on the end face of the second end. The ends of each insert protrude outward and are evenly distributed with the axis of the tube hole as the center. The first annular groove, the second annular groove, and the inserts are all enclosed in the injection molding part.

2. The composite pipe fitting connector according to claim 1, characterized in that, A spacer is provided between each of the first annular grooves, and the position of the second annular groove corresponds to the position of the spacer.

3. The composite pipe fitting connector according to claim 2, characterized in that, The outer side of the second annular groove approaches the outer wall of the spacer, and the inner side of the first annular groove approaches the inner wall of the tube hole.

4. The composite pipe fitting connector according to claim 1, characterized in that, The injection molding part includes an outer part and an inner part. The outer part is arranged around the outer periphery of the inner part. A through hole is opened in the middle of the inner part. The axis of the through hole coincides with the axis of the tube hole. A second convex ring is provided on the outer periphery of the inner part. A first convex ring is provided on the inner side of the outer part. The second convex ring is engaged with the second ring groove, and the first convex ring is engaged with the first ring groove.

5. The composite pipe fitting connector according to claim 4, characterized in that, A nesting portion is provided on the outer side near the second end. The diameter of the nesting portion is larger than the diameter of the first end. The nesting portion is located between the outer portion and the inner portion. A shoulder surface is provided on the end of the nesting portion facing the first end. The end face of the outer portion is flush with the shoulder surface.

6. The composite pipe fitting connector according to claim 5, characterized in that, The inner side of the tube hole is provided with a first stepped surface, which abuts against the end face of the inner package.

7. The composite pipe fitting connector according to claim 6, characterized in that, The outer periphery of the metal core is also provided with an external hexagonal surface, which is located between the external thread and the nested portion.

8. The composite pipe fitting connector according to claim 1, characterized in that, The insert has limiting surfaces on both sides, and the angle between the limiting surfaces and the end face of the second end is no greater than 90 degrees.

9. The composite pipe fitting connector according to claim 3, characterized in that, The outer wall of the metal core is provided with a first column groove, which is perpendicular to the first annular groove and passes through each of the first annular grooves. One end of the first column groove extends outward from the end face of the second end, and the second annular groove communicates with the side of the first column groove.

10. The composite pipe fitting connector according to claim 9, characterized in that, The inner wall of the tube hole is provided with a second column groove, which is perpendicular to the second annular groove and passes through each of the second annular grooves. One end of the second column groove extends outward from the end face of the second end, and the first annular groove communicates with the side of the second column groove.

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