Insulation joint with movable joint

Abstract

The utility model discloses an insulation joint with a movable joint, which comprises the movable joint, a metal joint and an insulation head, the insulation head is arranged between the movable joint and the metal joint, the movable joint comprises a connector and a nut, the nut is movably sleeved on the periphery of the connector, and the metal joint is arranged on the metal joint. The limiting plate is provided with a first sealing ring located in the nut, the insulating head is provided with a second sealing ring located in the metal joint, and the end portion of the connector is provided with a sealing assembly located in the nut. The natural gas pipeline union has the advantages that the first sealing ring, the second sealing ring and the sealing assembly are used for improving the sealing performance of the natural gas pipeline in the connecting process, and the nut of the union can rotate around the connector in the circumferential direction and can also slide in the axial direction of the nut. Therefore, when the gas pipe connector is in threaded connection with a gas pipe, connection can be achieved only by adjusting the angle of the nut, installation can be achieved without adjusting the angle of an external pipeline, and installation is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of gas channel joints, in particular to an insulating joint with a flexible joint. Background Art

[0002] Insulating joints are special components used in pipeline systems. They are mainly used to prevent current from flowing between different pipe sections and protect pipelines from electrochemical corrosion. They are widely used in gas, petroleum, chemical and other industries, especially in long-distance transmission pipelines, urban gas pipeline networks, pressure regulating station connections and other locations to ensure the safe and stable operation of the pipeline system. Metal joints are inevitably required in urban gas pipeline connections. When two metal joints and metal nuts in traditional structures are connected, static electricity is easily generated, which affects the safety of pipeline use.

[0003] A prior art Chinese utility model patent (grant publication number: CN219655515U) provides an insulating joint for gas pipelines, comprising an externally threaded metal joint and a metal nut. A plastic component is injection-molded between the externally threaded metal joint and the metal nut. The plastic component comprises a first pipe segment, a second pipe segment, and a third pipe segment integrally formed and arranged in sequence. The outer wall of the first pipe segment is connected to the externally threaded metal joint, and the inner wall of the third pipe segment is connected to the outer wall of the metal nut. This insulating joint for gas pipelines positions the externally threaded metal joint outside the plastic component and the metal nut inside the plastic component. The two metal components are separated by the plastic component, and the second pipe segment separates them by a distance, completely eliminating the problem of static electricity conduction between the metal joint and the metal nut during the connection process, achieving insulation performance and significantly improving the safety of gas pipelines.

[0004] Although the above-mentioned prior art can solve the problem of static electricity conduction by connecting a metal joint to the outer wall of the first pipe section of the plastic part and connecting a metal nut to the inner wall of the third pipe section of the plastic part, a key requirement for the joint of the natural gas pipeline is sealing. The above-mentioned prior art lacks a technical solution to solve the sealing problem. In addition, due to the different thread positions during installation, the above-mentioned prior art also requires adjustment of the angle of the joint or the external pipe during installation so that the joint can be threadedly connected to the gas pipe, which makes the installation more troublesome. Therefore, the above-mentioned shortcomings need to be improved urgently. Utility Model Content

[0005] The purpose of the present invention is to solve the above problems. The present invention provides an insulating joint with a flexible joint, which has the advantages of more convenient and flexible installation and better sealing performance.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: including a flexible joint, a metal joint and an insulating head, the insulating head is installed between the flexible joint and the metal joint, the flexible joint includes a connecting head and a nut, the nut is movably sleeved on the outer periphery of the connecting head, the nut is provided with a limiting ring, one end of the connecting head is provided with a limiting plate that cooperates with the limiting ring, the outer periphery of the connecting head is provided with a threaded head that cooperates with the thread of the insulating head, the limiting plate is provided with a first sealing ring located in the nut, the insulating head is provided with a second sealing ring located in the metal joint, the end of the connecting head is provided with a sealing assembly located in the nut, and the sealing assembly is sealed with the inner wall of the external pipe.

[0007] Preferably, the sealing assembly includes a movable rod, a connecting ring and a third sealing ring, the limiting plate is provided with a connecting hole for the movable rod to slide, the connecting ring is arranged at one end of the movable rod, and the third sealing ring is sleeved on the connecting ring.

[0008] Preferably, the connecting ring is provided with a first protrusion, the third sealing ring is provided with a groove matching with the first protrusion, and the groove of the third sealing ring is mounted in a corresponding matching manner with the first protrusion of the connecting ring.

[0009] Preferably, the outer diameter of the third sealing ring at an end away from the connecting ring is smaller than the outer diameter of the third sealing ring at an end close to the connecting ring.

[0010] Preferably, a bolt that is engaged with the limiting plate is installed at the other end of the movable rod, and the diameter of the bolt head is larger than the aperture of the connecting hole.

[0011] Preferably, a second protrusion is provided on the limiting plate, and the first sealing ring is sleeved on the outer periphery of the second protrusion.

[0012] Preferably, the connector has a first limiting step that cooperates with the insulating head in limiting position.

[0013] Preferably, the insulating head includes an external threaded joint and an internal threaded joint, and a second limiting step is formed between the external threaded joint and the internal threaded joint to limit the metal joint. The external threaded joint is threadedly engaged with the metal joint, and the internal threaded joint is threadedly engaged with the threaded head of the connecting head.

[0014] Preferably, the connecting head has a first through hole, the insulating head has a second through hole, and the inner diameters of the first through hole and the second through hole are equal.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The utility model provides an insulating joint with a flexible joint, which improves the sealing performance of the natural gas pipeline during connection through a first sealing ring, a second sealing ring and a sealing assembly, and the nut of the flexible joint can rotate around the circumference of the connector and can also slide along the axial direction of the nut. Therefore, when threadedly connecting with the gas pipe, it is only necessary to adjust the angle of the nut to achieve the connection, and it is not necessary to adjust the angle of the external pipeline for installation, which is more convenient to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of A;

[0019] Figure 3 It is a schematic diagram of the exploded three-dimensional structure of the connector, the connecting ring and the movable rod of the utility model.

[0020] Description of the drawings: 1. Flexible joint; 11. Nut; 111. Limiting ring; 12. Connecting head; 120. First through hole; 121. Threaded head; 122. First limiting step; 13. Limiting plate; 130. Connecting hole; 131. Second protrusion; 2. Insulating head; 21. Externally threaded joint; 210. Second through hole; 211. Second limiting step; 22. Internally threaded joint; 3. Metal joint; 31. First sealing ring; 32. Second sealing ring; 33. Third sealing ring; 331. Groove; 41. Movable rod; 411. Bolt; 42. Connecting ring; 421. First protrusion. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] like Figure 1-Figure 3As shown, an insulating joint with a flexible joint includes a flexible joint 1, a metal joint 3 and an insulating head 2. The insulating head 2 is made of ceramic or plastic. In addition to ceramic and plastic, it can also be made of other insulating materials. The insulating head 2 is installed between the flexible joint 1 and the metal joint 3. The flexible joint 1 includes a connector 12 and a nut 11. The nut 11 is movably sleeved on the outer periphery of the connector 12. The nut 11 can rotate around the circumference of the connector 12 and the nut 11 can also reciprocate along the axial direction of the connector 12. The nut 11 is provided with a limiting ring 1 11, one end of the connector 12 is provided with a limiting plate 13 that is limited by the limiting ring 111, the outer periphery of the connector 12 is provided with a threaded head 121 that is threadedly matched with the insulating head 2, the connector 12 has a first limiting step 122 that is limited by the insulating head 2, the limiting plate 13 is provided with a first sealing ring 31 located in the nut 11, the insulating head 2 is provided with a second sealing ring 32 located in the metal joint 3, the end of the connector 12 is provided with a sealing assembly located in the nut 11, and the sealing assembly is sealed with the inner wall of the external pipe.

[0023] The first sealing ring 31, the second sealing ring 32 and the sealing assembly are used to improve the sealing performance of the natural gas pipeline during connection, and the nut 11 of the flexible joint 1 can rotate around the circumference of the connector 12 and can also slide axially along the nut 11. Therefore, when threadedly connecting with the gas pipe, it is only necessary to adjust the angle of the nut 11 to achieve the connection, and it is not necessary to adjust the angle of the external pipeline for installation, which makes installation more convenient.

[0024] The sealing assembly includes a movable rod 41, a connecting ring 42 and a third sealing ring 33. The limiting plate 13 is provided with a connecting hole 130 for the movable rod 41 to slide. The connecting ring 42 is arranged at one end of the movable rod 41, the third sealing ring 33, and the movable rod 41 is provided with multiple pieces. In this application, the number of movable rods 41 is eight, and the number of connecting holes 130 is also eight. Each of the movable rods 41 corresponds to the connecting hole 130 one by one, and the movable rod 41 is realized by the limiting ring 111 to slide axially in the connecting hole 130.

[0025] The connecting ring 42 is provided with a first protrusion 421, and the third sealing ring 33 is provided with a groove 331 that cooperates with the first protrusion 421. The groove 331 of the third sealing ring 33 is installed in correspondence with the first protrusion 421 of the connecting ring 42. The outer diameter of the end of the third sealing ring 33 away from the connecting ring 42 is smaller than the outer diameter of the end of the third sealing ring 33 close to the connecting ring 42, thereby achieving the function of positioning and installing the third sealing ring 33.

[0026] The other end of the movable rod 41 is installed with a bolt 411 that cooperates with the limit plate 13. The diameter of the head of the bolt 411 is larger than the aperture of the connecting hole 130. The bolt 411 realizes the limiting function, thereby preventing the movable rod 41 from falling off the limit plate 13 when moving axially in the connecting hole 130.

[0027] The limiting plate 13 is provided with a second protrusion 131 , and the first sealing ring 31 is sleeved on the outer periphery of the second protrusion 131 , thereby achieving the function of positioning and installing the first sealing ring 31 .

[0028] The insulating head 2 includes an external threaded joint 21 and an internal threaded joint 22, and a second limiting step 211 is formed between the external threaded joint 21 and the internal threaded joint 22 to limit the metal joint 3. The external threaded joint 21 is threadedly engaged with the metal joint 3, and the internal threaded joint 22 is threadedly engaged with the threaded head 121 of the connecting head 12.

[0029] The connector 12 has a first through hole 120, and the insulating head 2 has a second through hole 210. The inner diameters of the first through hole 120 and the second through hole 210 are equal, so that the natural gas flow rate inside the connector does not change during use, making the natural gas flow rate stable and the pressure inside the connector unchanged.

[0030] During specific use: a joint with a gas pipe (not shown in the figure) is inserted into the nut 11, the joint (not shown in the figure) is threadedly matched with the inner wall of the nut 11, and the end of the joint with the gas pipe is sealed and matched with the first sealing ring 31, and the nut 11 is rotated to make the nut 11 and the joint move relative to each other in the axial direction, so that the limiting ring 111 is abutted and matched with the movable rod 41, and the abutting ring pushes the movable rod 41 to move to the side away from the abutting ring, thereby driving the connecting ring 42 and the third sealing ring 33 to move synchronously, so that the third sealing ring 33 is sealed and matched with the inner wall of the joint, thereby further improving the sealing of the overall connection, preventing natural gas leakage, and improving safety. In addition, through the movable cooperation between the nut 11 and the connector 12 of the flexible joint 1, it is only necessary to adjust the angle of the nut 11 when connecting the external gas pipe, without adjusting the angle of the gas pipe as a whole, making installation more convenient and flexible.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An insulating joint with a flexible joint, characterized in that: The present invention comprises a flexible joint (1), a metal joint (3) and an insulating head (2), wherein the insulating head (2) is installed between the flexible joint (1) and the metal joint (3), the flexible joint (1) comprises a connector (12) and a nut (11), the nut (11) is movably sleeved on the outer periphery of the connector (12), the nut (11) is provided with a limiting ring (111), one end of the connector (12) is provided with a limiting plate (13) which is limitedly matched with the limiting ring (111), the outer periphery of the connector (12) is provided with a threaded head (121) which is threadedly matched with the insulating head (2), the limiting plate (13) is provided with a first sealing ring (31) located in the nut (11), the insulating head (2) is provided with a second sealing ring (32) located in the metal joint (3), the end of the connector (12) is provided with a sealing component located in the nut (11), and the sealing component is sealed with the inner wall of the external pipe.

2. The insulating joint with a flexible joint according to claim 1, characterized in that: The sealing assembly comprises a movable rod (41), a connecting ring (42) and a third sealing ring (33); the limiting plate (13) is provided with a connecting hole (130) for the movable rod (41) to slide; the connecting ring (42) is arranged at one end of the movable rod (41); and the third sealing ring (33) is sleeved on the connecting ring (42).

3. The insulating joint with a flexible joint according to claim 2, characterized in that: The connecting ring (42) is provided with a first protrusion (421), the third sealing ring (33) is provided with a groove (331) that matches the first protrusion (421), and the groove (331) of the third sealing ring (33) is correspondingly matched and installed with the first protrusion (421) of the connecting ring (42).

4. An insulating joint with a flexible joint according to claim 2 or 3, characterized in that: The outer diameter of the end of the third sealing ring (33) away from the connecting ring (42) is smaller than the outer diameter of the end of the third sealing ring (33) close to the connecting ring (42).

5. The insulating joint with a flexible joint according to claim 2, characterized in that: The other end of the movable rod (41) is provided with a bolt (411) that is engaged with the limiting plate (13) in a limiting manner, and the diameter of the head of the bolt (411) is larger than the diameter of the connecting hole (130).

6. The insulating joint with a flexible joint according to claim 1, characterized in that: A second protrusion (131) is provided on the limiting plate (13), and the first sealing ring (31) is sleeved on the outer periphery of the second protrusion (131).

7. The insulating joint with a flexible joint according to claim 1, characterized in that: The connector (12) is provided with a first limiting step (122) that is matched with the insulating head (2) in a limiting manner.

8. The insulating joint with a flexible joint according to claim 1, characterized in that: The insulating head (2) comprises an external threaded joint (21) and an internal threaded joint (22), wherein a second limiting step (211) is formed between the external threaded joint (21) and the internal threaded joint (22) and is limitedly matched with the metal joint (3); the external threaded joint (21) is threadedly matched with the metal joint (3), and the internal threaded joint (22) is threadedly matched with the threaded head (121) of the connecting head (12).

9. The insulating joint with a flexible joint according to claim 1, characterized in that: The connecting head (12) has a first through hole (120), and the insulating head (2) has a second through hole (210), and the inner diameters of the first through hole (120) and the second through hole (210) are equal.

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