Metal insert structure of screwed pipe joint

Abstract

The utility model discloses a screwed pipe joint metal insert structure which comprises a pipe joint, a channel is arranged in the pipe joint, one end of the pipe joint is an external joint, the other end of the pipe joint is an internal joint, the external joint and the internal joint are communicated with the channel, a first external thread insert is embedded outside the external joint, and a second external thread insert is embedded outside the first external thread insert. And a second external thread insert is embedded outside the internal connector. The first external thread insert externally embedded in the external connector of the pipe joint is provided with the first anti-loosening structure and the second anti-loosening structure, the second external thread insert externally embedded in the internal connector is provided with the third anti-loosening structure, and the multiple anti-loosening structures increase the joint area of the inserts and the pipe joint in injection molding. The axial binding force of the insert and the pipe joint is improved through the clamping jaws and the anti-loosening grooves, the connection sealing performance of the pipe joint and the water pipe is improved, and the integrity of a water path structure in the pipe joint is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of water pipe joints, in particular to a metal insert structure of a threaded pipe joint. Background Art

[0002] The existing pipe joints of water pipes are mainly made of plastic and metal inserts by injection molding. The structure of the metal insert is basically threaded and milled to enhance the strength of the product. However, the torsion and compressive strength of this structure are limited. Some metal inserts will loosen during use, or even separate from the plastic, shortening the service life of the product. Especially in the electric water heater's anti-electric wall, the pipe joints of the anti-electric wall are respectively connected to the water pipe of the electric water heater and the external water pipe. The metal insert needs to have a good combination with the plastic to have a higher torsion, so that the pipe joint can not only ensure the full connection and sealing with the water pipe, but also keep the water pressure reduction mechanism of the anti-electric wall intact and effective, so as to improve the reliability of the anti-electric wall.

[0003] CN201120571799.1 discloses an external threaded joint for pipe injection molding, including a hollow connector, one end of which is provided with external threads, and the other end of the column is embedded in the injection molding body. As an improvement, the outer wall of the column embedded in the injection molding body is provided with at least one annular groove arranged radially, and the column is evenly provided with radial grooves intersecting with at least one annular groove, and the radial grooves stop at the external threads of the connector. This technical solution only adopts the annular grooves arranged radially on the outer wall of the column, and the firmness of the injection molding connection between the metal insert and the plastic part is insufficient. After long-term use or multiple disassembly and assembly, the metal insert and the plastic part are loosened, resulting in a reduction in the connection seal between the pipe connector and the water pipe, and destroying the waterway structure inside the pipe connector. Utility Model Content

[0004] The purpose of the utility model is to provide a metal insert structure for a threaded pipe joint, so as to solve the problem that the injection molding connection between the metal insert and the plastic part in the prior art is not firm enough, and after long-term use or multiple disassembly and assembly, the metal insert and the plastic part become loose, resulting in reduced sealing of the connection between the pipe joint and the water pipe, and damaging the water channel structure inside the pipe joint, so as to overcome the deficiencies of the prior art.

[0005] The utility model provides a metal insert structure of a threaded pipe joint through the following technical scheme, including a pipe joint, wherein a channel is arranged inside the pipe joint, one end of the pipe joint is an external joint, and the other end is an internal joint, the external joint and the internal joint are connected to the channel, a first externally threaded insert is embedded outside the external joint, and a second externally threaded insert is embedded outside the internal joint.

[0006] Furthermore, a first anti-loosening structure is convexly provided on the inner wall of the first externally threaded insert in the circumferential direction, and a second anti-loosening structure is circumferentially extended on the bottom end of the first externally threaded insert.

[0007] Furthermore, the first anti-loosening structure is a plurality of first protrusions spaced apart on the inner wall of the first externally threaded insert, and the first protrusions are parallel to the axis of the external joint.

[0008] Furthermore, the second anti-loosening structure is a plurality of claws extending circumferentially along the bottom of the first external thread insert, the claws are arranged at intervals, and the claws are parallel to the axis of the external joint.

[0009] Furthermore, a third anti-loosening structure is protruded circumferentially from the inner wall of the second externally threaded insert.

[0010] Furthermore, the third anti-loosening structure is a plurality of second protrusions spaced apart on the inner wall of the second externally threaded insert, and the second protrusions are parallel to the axis of the internal joint.

[0011] Furthermore, the third anti-loosening structure is also provided with an anti-loosening groove, and the anti-loosening groove is continuously arranged in the second protrusion.

[0012] Furthermore, the heads of the first externally threaded insert and the second externally threaded insert are both provided with sealing ring installation grooves.

[0013] Furthermore, the pipe joint is made of plastic, the first externally threaded insert and the second externally threaded insert are made of metal, and the pipe joint is connected and formed with the first externally threaded insert and the second externally threaded insert by injection molding.

[0014] The utility model has the following beneficial effects: the first externally threaded insert embedded in the external joint of the pipe joint is provided with a first anti-loosening structure and a second loosening structure, and the second externally threaded insert embedded in the internal joint is provided with a third anti-loosening structure. The multiple anti-loosening structures increase the joining area between the insert and the pipe joint during injection molding. The claws and the anti-loosening grooves also improve the axial bonding force between the insert and the pipe joint, improve the connection sealing between the pipe joint and the water pipe, and maintain the integrity of the water channel structure inside the pipe joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a schematic diagram of the overall structure of a metal insert for a threaded pipe joint.

[0016] Figure 2 The utility model is an exploded schematic diagram of a metal insert structure of a threaded pipe joint.

[0017] Figure 3 It is an axial cross-sectional view of a metal insert structure of a threaded pipe joint described in the utility model.

[0018] in, Figures 1 to 3 The corresponding relationship between the reference numerals and component names in the figure is:

[0019] 1 pipe joint, 2 external joint, 3 internal joint, 4 channel, 5 first external thread insert, 6 second external thread insert, 7 first protrusion, 8 claw, 9 second protrusion, 10 anti-loosening groove, 11 sealing ring installation groove. DETAILED DESCRIPTION

[0020] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0021] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0022] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0023] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] Refer to the following Figure 1-3 A metal insert structure for a threaded pipe joint according to some embodiments of the present application is described.

[0026] The utility model provides a threaded pipe joint metal insert structure through the following technical scheme, which is particularly used in the anti-electric wall of an electric water heater; wherein, it includes a pipe joint 1, a channel 4 is arranged inside the pipe joint, one end of the pipe joint 1 is an external joint 2, and the other end is an internal joint 3, the internal joint 3 is connected to the water pipe on the electric water heater, the external joint 2 is connected to the external water pipe, the external joint 2 and the internal joint 3 are connected with the channel 4, so that the water inside and outside the electric water heater can flow.

[0027] The external joint 2 is embedded with a first external thread insert 5, and the internal joint 3 is embedded with a second external thread insert 6; the pipe joint 1 is made of plastic, and the first external thread insert 5 and the second external thread insert 6 are made of metal. The pipe joint 1 is connected with the first external thread insert 5 and the second external thread insert 6 by injection molding.

[0028] In order to improve the firmness of the injection molding connection between the pipe joint 1 and the first externally threaded insert 5 and the second externally threaded insert 6, a first anti-loosening structure is convexly provided on the circumferential direction of the inner wall of the first externally threaded insert 5. The first anti-loosening structure is a plurality of first protrusions 7 arranged at intervals on the inner wall of the first externally threaded insert 5, and the first protrusions 7 are parallel to the axis of the external joint 2; a second anti-loosening structure is circumferentially extended at the bottom end of the first externally threaded insert 5, and the second anti-loosening structure is a plurality of claws 8 extending circumferentially along the bottom of the first externally threaded insert 5, and the claws 8 are arranged at intervals and parallel to the axis of the external joint 2.

[0029] Similarly, a third anti-loosening structure is circumferentially protruded on the inner wall of the second externally threaded insert 6. The third anti-loosening structure is a plurality of second protrusions 9 arranged at intervals on the inner wall of the second externally threaded insert 6. The second protrusions 9 are parallel to the axis of the internal joint 3. At the same time, the third anti-loosening structure is also provided with an anti-loosening groove 10, which is continuously arranged in the second protrusions 9.

[0030] When the pipe joint 1 is connected with the first externally threaded insert 5 and the second externally threaded insert 6 by injection molding, the plastic part of the pipe joint 1 is staggeredly engaged with the first protrusion 7, the claw 8 and the second protrusion 9, thereby increasing the contact area between each other and limiting the rotation of the pipe joint 1 relative to the first externally threaded insert 5 and the second externally threaded insert 6, thereby improving the firmness of the connection.

[0031] In addition, the release groove 10 and the claw 8 also limit the axial movement of the pipe joint 1 relative to the first external thread insert 5 and the second external thread insert 6, further improving the firmness of the connection.

[0032] A sealing ring installation groove 11 is provided at the head of the first external thread insert 5 and the second external thread insert 6, so as to improve the sealing effect of the connection between the external joint 2 and the internal joint 3 and the corresponding pipeline.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal insert structure for a threaded pipe joint, characterized in that: It comprises a pipe joint, wherein a channel is arranged inside the pipe joint, one end of the pipe joint is an external joint, and the other end is an internal joint, the external joint and the internal joint are connected with the channel, the external joint is embedded with a first external thread insert, and the internal joint is embedded with a second external thread insert.

2. A metal insert structure for a threaded pipe joint according to claim 1, characterized in that: A first anti-loosening structure is convexly provided on the inner wall of the first external thread insert in the circumferential direction, and a second anti-loosening structure is circumferentially extended on the bottom end of the first external thread insert.

3. A metal insert structure for a threaded pipe joint according to claim 2, characterized in that: The first anti-loosening structure is a plurality of first protrusions spaced apart on the inner wall of the first external thread insert, and the first protrusions are parallel to the axis of the external joint.

4. A metal insert structure for a threaded pipe joint according to claim 2, characterized in that: The second anti-loosening structure is a plurality of claws extending circumferentially along the bottom of the first external thread insert, the claws are arranged at intervals, and the claws are parallel to the axis of the external joint.

5. A metal insert structure for a threaded pipe joint according to claim 1, characterized in that: A third anti-loosening structure is protruded circumferentially from the inner wall of the second external thread insert.

6. A metal insert structure for a threaded pipe joint according to claim 5, characterized in that: The third anti-loosening structure is a plurality of second protrusions spaced apart on the inner wall of the second external thread insert, and the second protrusions are parallel to the axis of the internal joint.

7. A metal insert structure for a threaded pipe joint according to claim 6, characterized in that: The third anti-loosening structure is further provided with an anti-loosening groove, and the anti-loosening groove is continuously arranged in the second protrusion.

8. The metal insert structure of a threaded pipe joint according to claim 1, characterized in that: The heads of the first externally threaded insert and the second externally threaded insert are both provided with sealing ring mounting grooves.

9. A metal insert structure for a threaded pipe joint according to any one of claims 1 to 8, characterized in that: The pipe joint is made of plastic, the first externally threaded insert and the second externally threaded insert are made of metal, and the pipe joint is connected and formed with the first externally threaded insert and the second externally threaded insert by injection molding.

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