Insulation joint for gas pipe

Abstract

The utility model relates to an insulating joint for a gas pipe, which comprises metal joints and a plastic part, the two ends of the plastic part are integrally provided with the metal joints through injection molding, and the two metal joints are insulated by spacing the plastic part; the metal joint comprises an external thread joint and an internal thread joint, the external diameter of the outer section of the external thread joint is provided with external threads, the external diameter of the inner section of the external thread joint is provided with polygonal edges integrated with the plastic part in an injection molding mode, the internal diameter of the external thread joint is a through hole, and a stepped hole with the hole diameter larger than that of the through hole is formed in the inner end of the through hole; the inner diameter of the inner section is provided with a second internal thread, the inner diameter of the second internal thread is smaller than that of the first internal thread and larger than the aperture of the through hole, and the outer diameter of the internal thread connector is provided with a polygonal edge integrated with the plastic part in an injection molding mode. According to the structure, the overall structural strength is high, deformation and damage are not prone to occurring, the metal connector is not prone to disengagement, use is more reliable and safer, the internal thread connector is provided with the second internal threads, and function expansion and use are facilitated.

Description

Technical Field

[0001] The utility model relates to a pipe joint, which is an insulating joint for a gas pipe. Background Art

[0002] A pipe joint is a joint used to connect pipe fittings. Existing pipe joints are divided into metal pipe joints and plastic pipe joints, or composite pipe joints combining metal and plastic according to the material. Composite pipe joints have the durability and reliability of metal pipe joints, while also taking into account the economy and safety of plastics, and are widely used. For example, the authorization announcement number CN219655515U published in the Chinese patent literature, the authorization announcement date is September 8, 2023, and the utility model name is "an insulating joint for gas pipelines", which includes a metal joint with an external thread and a metal nut. A plastic part is injection-molded between the metal joint with an external thread and the metal nut. The plastic part includes a first pipe section, a second pipe section, and a third pipe section that are integrally formed and arranged in sequence. The outer wall of the first pipe section is connected to the metal joint with an external thread, and the inner wall of the third pipe section is connected to the outer wall of the metal nut. The above structure realizes the separation of the metal joint and the metal nut at both ends of the plastic part to avoid the problem of electrostatic conduction. However, the overall structural strength of the above-mentioned insulating joint is poor, and the metal joint, the metal nut and the plastic part are prone to aging and loosening, and the function is relatively single, and there is no indication function for pipeline conduction. For this reason, it remains to be improved the existing insulating joint for gas pipe. Summary of the invention

[0003] In order to overcome the above shortcomings, the purpose of the utility model is to provide an insulating joint for gas pipes in the art, so as to solve the technical problems of the existing similar pipe joints with poor structural strength, relatively single functions, and no conductive indication function. The purpose is achieved through the following technical solutions.

[0004] An insulating joint for a gas pipe, the insulating joint for a gas pipe comprises a metal joint and a plastic part, both ends of the plastic part are integrally provided with metal joints by injection molding, and insulation is formed between the two metal joints by a spacer plastic part; the key points of the structure are that the metal joint comprises an external thread joint and an internal thread joint, the outer diameter of the outer section of the external thread joint is provided with an external thread, the outer diameter of the inner section is provided with a polygonal edge integrally provided with the plastic part by injection molding, the inner diameter of the external thread joint is a through hole, the inner end of the through hole forms a stepped hole with a larger aperture than the through hole, the inner diameter of the outer section of the internal thread joint is provided with a first internal thread, the inner diameter of the inner section is provided with a second internal thread, the inner diameter of the second internal thread is smaller than the inner diameter of the first internal thread and larger than the aperture of the through hole, and the outer diameter of the internal thread joint is provided with a polygonal edge integrally provided with the plastic part. In the above structure, the internal thread joint and the external thread joint are integrally provided with the plastic part by injection molding through the polygonal edge, so that the overall structural strength is high, not easy to deform and damage, the metal joint is not easy to fall out, and it is more reliable and safe to use. At the same time, the internal threaded joint is provided with a second internal thread, which is convenient for installing other functional accessories inside, such as installing throttle valves, one-way valves and other functional accessories, thereby facilitating the expansion of functions.

[0005] A mounting hole for loading the overcurrent isolator is provided between the external thread joint and the internal thread joint, and a thread matching the second internal thread is provided on the outer diameter of the overcurrent isolator, that is, the overcurrent isolator matches the second internal thread of the internal thread joint to form a fixation, and the fixed overcurrent isolator is embedded in the stepped hole of the external thread joint and pressed against to form a seal. With this structure, the pipe joint has the function of overcurrent isolation, and is safer and more reliable to use.

[0006] A sealing ring is tightly arranged between the stepped hole of the external threaded joint and the end surface of the overcurrent isolator. This structure is conducive to improving the sealing effect and further improving the reliability of use.

[0007] The overcurrent isolator includes a shell, a movable shaft, a sealing plate, and a spring. The sealing plate is fixed to the movable shaft and placed in the shell. Both ends of the shell are provided with shaft brackets for flow. Both ends of the movable shaft are axially slidably matched with the shaft bracket. The spring is sleeved on the movable shaft and abuts against the sealing plate and one end of the shaft bracket. The shell is provided with a through hole with a diameter smaller than the sealing plate. When the sealing plate compresses the spring and abuts against the through hole, the overcurrent isolator forms an isolation state, that is, a flow cutoff state is formed between the external threaded joint and the internal threaded joint. The above is a specific structural embodiment of the overcurrent isolator, which has a relatively simple structure and is easy to manufacture and use.

[0008] The outer diameter of the plastic part is provided with a lamp slot, in which a light emitting diode is installed, and the two poles of the light emitting diode are respectively connected with the external thread joint and the internal thread joint through a conductive sheet. With this structure, when static electricity or leakage occurs in the pipeline, the light emitting diode can realize conductive indication, and the leakage forms a safe voltage after passing through the light emitting diode, which will not cause safety accidents.

[0009] The inner end of the internal thread joint and / or the inner end of the external thread joint both form an annular groove, and the plastic part is fixed with the groove during injection molding. Through this structure, the structural connection strength of the metal joint and the plastic part is further improved.

[0010] The outer diameter of the plastic part is a polygonal structure. This structure facilitates the plastic part to cooperate with the tool to realize the rotation operation.

[0011] The overall structure of the utility model is relatively simple, and the injection molding connection between the metal joint and the plastic part is relatively reliable and has high strength. The problem of the metal joint and the plastic part falling off is not easy to occur. At the same time, functional accessories are conveniently connected inside the joint to achieve functional expansion. In addition, it has a conductive indication function and is safer to use. It is suitable for use as an insulating joint for gas pipes, or a structural improvement of similar pipe joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model, in which AA section is made.

[0013] Figure 2 yes Figure 1 AA cross-sectional structure schematic diagram.

[0014] Figure 3 yes Figure 2 Schematic diagram of the structure in which an overcurrent isolator is added.

[0015] Figure 4 yes Figure 3 Schematic diagram of the structure of the medium current isolator, in which the dotted line represents the interior.

[0016] Figure 5 yes Figure 2 Schematic diagram of the structure in which a light emitting diode is added.

[0017] Figure 6 yes Figure 2 Schematic diagram of the improved scheme structure.

[0018] The serial numbers and names in the figure are: 1. Plastic part, 2. External thread connector, 201. External thread, 202. Through hole, 203. Step hole, 3. Internal thread connector, 301. First internal thread, 302. Second internal thread, 4. Overcurrent isolator, 401. Housing, 4011. Shaft bracket, 4012. Through port, 402. Movable shaft, 403. Sealing plate, 404. Spring, 5. Light-emitting diode, 6. Conductive sheet. Implementation

[0019] The utility model is now further described with reference to the accompanying drawings.

[0020] like Figure 1 , Figure 2 As shown, the insulating joint for gas pipe includes a metal joint and a plastic part 1, the metal joint includes an external thread joint 2 and an internal thread joint 3, the outer diameter of the outer section of the external thread joint is provided with an external thread 201, the outer diameter of the inner section is provided with a polygonal ridge that is integrally molded with the plastic part, the inner diameter of the external thread joint is a through hole 202, and the inner end of the through hole forms a stepped hole 203 with a larger aperture than the through hole; the inner diameter of the outer section of the internal thread joint is provided with a first internal thread 301, the inner diameter of the inner section is provided with a second internal thread 302, the inner diameter of the second internal thread is smaller than the inner diameter of the first internal thread and larger than the aperture of the through hole, and the outer diameter of the inner section of the internal thread joint is provided with a polygonal ridge that is integrally molded with the plastic part. The external thread joint and the internal thread joint are both formed by the polygonal ridge of the outer diameter of the inner section and the plastic part through injection molding, so that the plastic part is separated between the internal thread joint and the external thread joint to form insulation, and the outer diameter of the plastic part is a polygonal structure, such as a nut shape, which is convenient for screwing with a wrench tool.

[0021] like Figure 3 As shown, a mounting hole for loading the overcurrent interrupter 4 is provided between the external threaded joint 2 and the internal threaded joint 3, and a thread matching the second internal thread 302 is provided on the outer diameter of the overcurrent interrupter, that is, the overcurrent interrupter matches the second internal thread of the internal threaded joint to form a fixation, and the fixed overcurrent interrupter is embedded in the stepped hole of the external threaded joint and pressed against to form a seal. A sealing ring is pressed against the stepped hole of the external threaded joint and the end face of the overcurrent interrupter, which is conducive to further improving the sealing effect.

[0022] like Figure 4 As shown, the above-mentioned over-current isolator 4 includes a shell 401, a movable shaft 402, a sealing plate 403, and a spring 404. The sealing plate is fixed to the movable shaft and placed in the shell. Both ends of the shell are provided with shaft brackets 4011 for flow. Both ends of the movable shaft are axially slidably matched with the shaft bracket. The spring is sleeved on the movable shaft and abuts against the sealing plate and one end of the shaft bracket. A through hole 4012 with a smaller diameter than the sealing plate is provided in the shell. When the sealing plate compresses the spring and presses against the through hole, the over-current isolator forms an isolation state, that is, a flow cut-off state is formed between the external threaded joint and the internal threaded joint.

[0023] like Figure 5 As shown, the outer diameter of the plastic part 1 may also be provided with a lamp groove, in which a light-emitting diode 5 is installed. The two poles of the light-emitting diode are respectively connected with the external thread joint and the internal thread joint through a conductive sheet 6, so that when static electricity or leakage occurs in the pipeline, the light-emitting diode can be relied on to provide a conductive indication, and the leakage forms a safe voltage after passing through the light-emitting diode, which will not cause a safety accident.

[0024] like Figure 6 As shown, in order to make the injection connection between the metal joint and the plastic part 1 more reliable, the inner end of the internal thread joint 3 and / or the inner end of the external thread joint 2 are both formed with an annular groove, and the plastic part is fixed with the groove during injection molding to improve the connection strength.

[0025] The above contents are intended to illustrate the technical means of the utility model, but not to limit the technical scope of the utility model. Those skilled in the art can make obvious improvements or substitutions to the utility model in combination with existing common knowledge, which also fall within the protection scope of the claims of the utility model.

Claims

1. An insulating joint for a gas pipe, comprising a metal joint and a plastic part (1), wherein both ends of the plastic part are integrally provided with metal joints by injection molding, and insulation is formed between the two metal joints by a spacing plastic part; characterized in that The metal joint comprises an external thread joint (2) and an internal thread joint (3); the external thread joint has an external thread (201) on its outer diameter, and an internal thread joint has a polygonal edge that is integrally molded with the plastic part (1) on its outer diameter; the internal diameter of the external thread joint is a through hole (202); a stepped hole (203) having a larger diameter than the through hole is formed at the inner end of the through hole; the internal diameter of the external thread joint (3) has a first internal thread (301) on its inner diameter, and a second internal thread (302) on its inner diameter; the second internal thread has an inner diameter smaller than the first internal thread and larger than the diameter of the through hole; and the external diameter of the internal thread joint has a polygonal edge that is integrally molded with the plastic part.

2. The insulating joint for gas pipe according to claim 1, characterized in that A mounting hole for loading an overcurrent interrupter (4) is provided between the external thread joint (2) and the internal thread joint (3); a thread that cooperates with the second internal thread (302) is provided on the outer diameter of the overcurrent interrupter, i.e., the overcurrent interrupter cooperates with the second internal thread of the internal thread joint to form a fixed connection; the fixed overcurrent interrupter is embedded in the stepped hole (203) of the external thread joint and pressed against to form a seal.

3. The insulating joint for gas pipe according to claim 2, characterized in that A sealing ring is tightly provided between the stepped hole (203) of the external threaded joint (2) and the end surface of the overcurrent isolator (4).

4. The insulating joint for gas pipe according to claim 2, characterized in that The overcurrent isolator (4) comprises an outer shell (401), a movable shaft (402), a sealing plate (403), and a spring (404); the sealing plate is fixed to the movable shaft and placed in the outer shell; shaft brackets (4011) for flow are provided at both ends of the outer shell; the two ends of the movable shaft are axially slidably matched with the shaft bracket; the spring is sleeved on the movable shaft and abuts against the sealing plate and one end of the shaft bracket; a through hole (4012) having a smaller diameter than the sealing plate is provided in the outer shell; when the sealing plate compresses the spring and abuts against the through hole, the overcurrent isolator forms an isolating state, that is, a flow cutoff state is formed between the external threaded joint (2) and the internal threaded joint (3).

5. The insulating joint for gas pipe according to claim 1, characterized in that The outer diameter of the plastic part (1) is provided with a lamp groove, in which a light emitting diode (5) is installed, and the two poles of the light emitting diode are respectively connected to the external thread joint (2) and the internal thread joint (3) through a conductive sheet (6).

6. The insulating joint for gas pipe according to claim 1, characterized in that The inner end of the internal thread joint (3) and / or the inner end of the external thread joint (2) both form an annular groove, and the plastic part is fixed in cooperation with the groove during injection molding.

7. The insulating joint for gas pipe according to claim 1, characterized in that The outer diameter of the plastic part (1) is in a polygonal structure.

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