Metal insert for plastic pipe fitting and plastic pipe fitting

Abstract

The utility model discloses a metal insert for a plastic pipe fitting and the plastic pipe fitting, and relates to the technical field of pipeline connecting pieces. Comprising an insert body, the outer surface of the insert body comprises convex parts and concave parts which are alternately arranged, the convex parts are of tooth structures, and the extension direction of the tooth structures intersects with the extension direction of the concave parts; a connecting part is arranged on the inner wall face of the insert body. The alternately arranged convex and concave structures can increase the connection tightness between the plastic pipe fitting and the metal insert, and meanwhile, the tooth structures of the convex parts intersect with the extension direction of the concave parts, so that the positions of the metal insert and the plastic pipe fitting can be fixed from different directions, and the metal insert and the plastic pipe fitting are prevented from generating relative movement and / or relative rotation. The metal insert can directly adopt the metal substrate with the tooth structure, the concave part is machined on the outer surface of the metal insert through turning, and the connecting part is machined on the inner surface of the metal insert, so that the machining difficulty is obviously reduced.

Description

Technical Field

[0001] This utility model relates to the field of pipe connector technology, and more specifically, to a metal insert for plastic pipe fittings and a plastic pipe fitting. Background Technology

[0002] Metal threaded fittings are components that are embedded in the ends of plastic pipe fittings to provide a connection. They can replace plastic threaded connections, increase the strength of the threaded connection, and prevent leaks or increased installation difficulty caused by damage to the plastic threaded connection. Fittings with metal threaded fittings are commonly used in plastic piping systems. They are required at pipe outlet connections (such as faucet connections) and intermediate pipe transitions (such as thread conversion points). These fittings have a wide range of applications and are used in large quantities.

[0003] Because the materials of the metal threaded connector insert and the plastic pipe fitting are different, if the structural design of the metal threaded connector insert is unreasonable, it may cause the metal threaded connector insert to separate from the plastic pipe fitting, or even cause water leakage. At present, in order to avoid the separation of the metal threaded connector insert from the plastic pipe fitting, various structures are usually set on the metal threaded connector insert to prevent it from rotating relative to the plastic pipe fitting, such as anti-rotation bumps, claw rings, ring platforms, and grooves. This makes the manufacturing process of the metal threaded connector insert complex. It usually requires cutting the metal bar stock, heating the raw material, stamping to form the blank of the metal threaded connector insert, machining the threads and ring platforms, and then using a milling machine to machine the anti-rotation bumps, claw rings, and grooves, and finally drilling holes with a drilling machine. This process greatly increases the manufacturing difficulty of the metal threaded connector insert.

[0004] In view of this, this utility model is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a metal insert for plastic pipe fittings and plastic pipe fittings.

[0006] This utility model is implemented as follows:

[0007] In a first aspect, this utility model provides a metal insert for plastic pipe fittings, including an insert body. The outer surface of the insert body includes alternating protrusions and recesses. The protrusions are toothed, and the extending direction of the toothed structure intersects with the extending direction of the recesses. A connecting portion is provided on the inner wall surface of the insert body.

[0008] In an optional embodiment, the extending direction of the tooth structure is perpendicular to the extending direction of the recess.

[0009] In an optional embodiment, the protrusions and recesses are alternately arranged along the axial direction of the insert body.

[0010] In an optional embodiment, the tooth structure extends in a direction parallel to the axial direction of the insert body, and the recess extends in a direction perpendicular to the axial direction of the insert body.

[0011] In an optional embodiment, the recess is an annular groove, and the groove shape includes at least one of rectangular, V-shaped, U-shaped, semi-circular and dovetail groove shapes.

[0012] In an optional embodiment, the shape of the tooth structure includes at least one of V-shape, rectangle, trapezoid, U-shape and semicircle.

[0013] In an optional embodiment, the inner wall surface of the insert body is provided with a foolproof protrusion, which is located on the end face of one end of the insert body.

[0014] In an optional embodiment, the outer surfaces of the two opposite ends of the insert body are a protrusion and a recess, respectively, with the anti-fooling protrusion located at one end of the recess.

[0015] In an optional embodiment, the connection part has a threaded structure.

[0016] Secondly, this utility model provides a plastic pipe fitting, including a pipe fitting body and a metal insert as described in any of the aforementioned embodiments, wherein the metal insert is disposed on the inner wall surface of one end of the pipe fitting body.

[0017] This utility model has the following beneficial effects:

[0018] This invention provides a metal insert for plastic pipe fittings and a plastic pipe fitting. By forming alternating protrusions and recesses on the surface of the insert body, the alternating protrusion and recess structure increases the connection tightness between the plastic pipe fitting and the metal insert. Simultaneously, the protrusions have a toothed structure, and the extension direction of the toothed structure intersects with the extension direction of the recessed portion. Therefore, the protrusions and recesses can fix the position between the metal insert and the plastic pipe fitting from different directions, preventing relative movement and / or relative rotation. Furthermore, the metal insert provided by this invention can directly use a metal substrate with a toothed structure, and the recessed portion can be machined on its outer surface and the connecting portion on its inner surface, significantly reducing the manufacturing difficulty. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1A schematic diagram of the structure of a metal insert for a plastic pipe fitting provided in the first embodiment of this utility model;

[0021] Figure 2 A cross-sectional view of a metal insert for a plastic pipe fitting provided in the first embodiment of this utility model;

[0022] Figure 3 This is a cross-sectional view of a plastic pipe fitting provided in the second embodiment of the present utility model.

[0023] Explanation of main component symbols: 100-metal insert; 110-protrusion; 120-recess; 130-connection; 140-foolproof protrusion; 10-plastic fitting; 200-fitting body. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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.

[0030] First Embodiment

[0031] Please refer to Figure 1 and Figure 2 This embodiment provides a metal insert 100 for plastic pipe fittings, including an insert body.

[0032] The outer surface of the insert body includes alternating protrusions 110 and recesses 120. The protrusions 110 and recesses 120 may be alternating along the axial direction of the insert body or along the radial direction of the insert body.

[0033] In this embodiment, the protrusion 110 and the recess 120 are alternately arranged along the axial direction of the insert body.

[0034] The metal insert 100 provided in this embodiment has three protrusions 110 and three recesses 120, and the regions where the two axially opposite ends of the metal insert 100 are connected to the end face are the protrusions 110 and the recesses 120, respectively.

[0035] In other embodiments, the number of protrusions 110 and recesses 120 can be adjusted as needed, for example, it can be a combination of two protrusions 110 and two recesses 120, or a combination of four protrusions 110 and four recesses 120, etc.

[0036] The protrusion 110 has a toothed structure, and the extending direction of the toothed structure intersects the extending direction of the recess 120. The extending direction of the toothed structure can be parallel to the axial direction of the insert body, or intersect the axial direction of the insert body. The extending direction of the recess 120 can be adjusted according to the extending direction of the toothed structure, or the extending direction of the toothed structure can be adjusted according to the extending direction of the recess 120.

[0037] For example, in this embodiment, the extending direction of the tooth structure is perpendicular to the extending direction of the recess 120. Specifically, the extending direction of the tooth structure is parallel to the axial direction of the insert body, and the extending direction of the recess 120 is perpendicular to the axial direction of the insert body. Therefore, in this embodiment, the recess 120 is an annular groove.

[0038] In other embodiments, the extending direction of the recess 120 may intersect but not be perpendicular to the axial direction of the insert body, for example, it may be designed as an oblique line or an arc, but the structure provided in this embodiment is preferred.

[0039] In this embodiment, the annular groove of the recess 120 has a rectangular shape. In other embodiments, the annular groove may also be at least one of a V-shape, a U-shape, a semi-circular shape, and a dovetail shape.

[0040] Alternatively, since the protrusions 110 and recesses 120 are alternately arranged, when a metal insert 100 has multiple recesses 120, the shapes of the annular grooves of the multiple recesses 120 can be the same or different. In this embodiment, to reduce the difficulty of processing, all annular grooves have the same shape.

[0041] In this embodiment, the tooth structure is a continuous floral pattern, and the shape of the tooth structure is V-shaped. In other embodiments, the shape of the tooth structure may also be at least one of rectangle, trapezoid, U-shape, and semicircle.

[0042] Alternatively, since the protrusions 110 and recesses 120 are alternately arranged, when a metal insert 100 has multiple protrusions 110, the shapes of the tooth structures of the multiple protrusions 110 can be the same or different. In this embodiment, in order to reduce the difficulty of processing, all tooth structures have the same shape.

[0043] The inner wall surface of the insert body is provided with a connecting portion 130. In this embodiment, the connecting portion 130 has an internal thread structure to adapt to most installation environments.

[0044] In this embodiment, the inner wall surface of the insert body is also provided with a foolproof protrusion 140, which is located on the end face of one end of the insert body corresponding to the recess 120. The inner diameter of the foolproof protrusion 140 is smaller than the minimum inner diameter of the connecting portion 130. During the installation and use of the metal insert 100, the foolproof protrusion 140 can position the pipe. When the pipe touches the foolproof protrusion 140, it indicates that the installation is in place, preventing the pipe from endlessly screwing into the metal insert 100.

[0045] In this embodiment, the metal insert 100 is made of copper alloy. In other embodiments, the metal insert 100 may also be made of stainless steel, aluminum alloy, or other metals.

[0046] This embodiment provides a metal insert 100 for plastic pipe fittings. After being fixed to the plastic pipe fitting 10, the serrated structure of the protrusion 110 prevents the metal insert 100 from rotating radially, and the annular groove of the recess 120 prevents the metal insert 100 from moving axially, achieving a good positioning effect between the plastic pipe fitting 10 and the metal insert 100. Furthermore, the metal insert 100 provided in this embodiment can be directly processed from existing copper parts with serrated edges. This requires only machining the recess 120, connecting part 130, and anti-misalignment protrusion 140 onto the copper part with serrated edges. The recess 120, connecting part 130, and anti-misalignment protrusion 140 can be obtained solely through machining, greatly improving the processing convenience of the metal insert 100, increasing processing efficiency, and reducing costs.

[0047] Second Embodiment

[0048] Please refer to Figure 3 This embodiment provides a plastic pipe fitting 10, including a pipe fitting body 200 and a metal insert 100 of the first embodiment. The metal insert 100 is disposed on the inner wall surface of one end of the pipe fitting body 200. The metal insert 100 and the pipe fitting body 200 are injection molded together. The end of the metal insert 100 with a foolproof protrusion 140 is away from the end face of the pipe fitting body 200.

[0049] In this embodiment, the pipe body 200 is made of PVC. In other embodiments, the pipe body 200 may also be made of other thermoplastic or thermosetting plastics such as ABS, PPR, and PE.

[0050] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A metal insert for plastic pipe fittings, characterized in that, The device includes an insert body, the outer surface of which includes alternating protrusions and recesses, the protrusions having a toothed structure, the extension direction of which intersects the extension direction of the recesses; and the inner wall of the insert body is provided with a connecting portion.

2. The metal insert according to claim 1, characterized in that, The extension direction of the tooth structure is perpendicular to the extension direction of the recess.

3. The metal insert according to claim 2, characterized in that, The protrusions and the recesses are alternately arranged along the axial direction of the insert body.

4. The metal insert according to claim 3, characterized in that, The tooth structure extends in a direction parallel to the axial direction of the insert body, and the recess extends in a direction perpendicular to the axial direction of the insert body.

5. The metal insert according to claim 4, characterized in that, The recessed portion is an annular groove, and the groove shape includes at least one of rectangular, V-shaped, U-shaped, semi-circular and dovetail groove shapes.

6. The metal insert according to claim 4, characterized in that, The shape of the tooth structure includes at least one of V-shape, rectangle, trapezoid, U-shape and semicircle.

7. The metal insert according to claim 1, characterized in that, The inner wall surface of the insert body is provided with a foolproof protrusion, which is located on the end face of one end of the insert body.

8. The metal insert according to claim 7, characterized in that, The outer surfaces of the two opposite ends of the insert body are a protrusion and a recess, respectively, and the anti-fooling protrusion is located at one end of the recess.

9. The metal insert according to claim 1, characterized in that, The connecting part has a threaded structure.

10. A plastic pipe fitting, characterized in that, It includes a pipe body and a metal insert as described in any one of claims 1 to 9, wherein the metal insert is disposed on the inner wall surface of one end of the pipe body.

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