Insulating joint for fuel gas

Abstract

The utility model discloses an insulating joint for fuel gas, which comprises a first connecting piece, and the first connecting piece comprises an external thread joint and a first connecting part extending outwards from one end of the external thread joint; the second connecting piece comprises an internal thread joint and a second connecting part which extends from one end of the internal thread joint to the first connecting part; the insulating part is provided with a first limiting groove for accommodating the first connecting part and a second limiting groove for accommodating the second connecting part; wherein the insulating part comprises a convex ring arranged between the first limiting groove and the second limiting groove and an isolating ring extending outwards from the inner wall of the convex ring in the radial direction, and the isolating ring surrounds the inner wall of the first connecting part and / or the inner wall of the second connecting part in the circumferential direction. The connecting strength of the insulating part and the first connecting part and the connecting strength of the first connecting part and the second connecting part are improved through clamping of the isolating ring, meanwhile, the axial distance between the first connecting part and the second connecting part in the air passing channel is increased, and the insulating effect is improved.

Description

Technical Field

[0001] This application relates to the technical field of gas pipe fittings, and in particular to an insulating fitting for gas. Background Technology

[0002] As the use of natural gas gradually expands, gas leak accidents from gas appliances are also increasing, especially in gas-fired wall-mounted boilers and water heaters. One cause of these gas leaks is that aging or dampness in gas appliances carrying high voltage can cause electrical leakage. The current flows through the stainless steel corrugated pipe connected to the appliance to the buried galvanized steel pipe, which then connects to the ground. Because the walls of the stainless steel corrugated pipe are too thin, a resistance heating effect occurs, causing the pipe to turn red or break down, leading to a gas explosion.

[0003] To avoid the aforementioned problems, the original metal connectors used to connect to gas appliances are replaced with insulated connectors to conduct high-voltage electricity to the galvanized steel pipe. Existing insulated connector structures, such as the "Insulated Connector for Gas Pipelines" disclosed in patent application CN222122542U, include an insulating plastic component and a first metal connector and a second metal connector connected to both ends of the insulating plastic component. The connection is generally achieved through injection molding, where the first and second metal connectors are placed in an injection mold and connected to the insulating plastic component via injection molding. This insulated connector structure uses a plastic component to separate the two metal connectors, thus blocking electrical conduction and reducing safety hazards caused by leakage.

[0004] The aforementioned insulating joint has a hollow air passage inside, and the two metal joints are separated by a raised ring of plastic parts. Due to the limited thickness of the raised ring, the distance between the two metal joints and the air passage is also limited. After long-term use, the plastic parts will also age, which may cause current to flow between the two metal joints during gas transmission, posing a certain safety hazard and lacking insulation effect. Utility Model Content

[0005] To improve insulation performance, this application provides an insulating connector for gas applications.

[0006] The technical solution for a gas-insulating joint provided in this application is as follows:

[0007] An insulating connector for gas applications, comprising:

[0008] A first connector, the first connector including an external threaded joint and a first connecting portion extending outward from one end of the external threaded joint;

[0009] A second connector, the second connector including an internally threaded connector and a second connecting portion extending from one end of the internally threaded connector toward the first connecting portion; and

[0010] An insulating component has a first limiting groove for receiving a first connecting portion and a second limiting groove for receiving a second connecting component.

[0011] The insulating component includes a convex ring placed between the first limiting groove and the second limiting groove, and an isolation ring extending radially outward from the inner wall of the convex ring, wherein the isolation ring circumferentially surrounds the inner wall of the first connecting portion and / or the second connecting portion.

[0012] By adopting the above technical solution, the first connector and the second connector achieve initial isolation through the separation of the insulating component. Specifically, while the convex ring separates the first limiting ring groove and the second limiting groove, the insulating ring connected to its inner wall covers the inner wall of the first and / or second connecting portions, thereby increasing the distance between the first and second connectors within the air passage, similar to increasing the creepage distance and effectively improving the insulation effect. Simultaneously, the insulating ring also helps to improve the connection strength between the insulating component and the first and second connectors.

[0013] Preferably, the first connecting portion has a first clearance groove, and one end of the isolation ring is engaged in the first clearance groove.

[0014] By adopting the above technical solution, the setting of the first clearance groove can improve the strength of the connection between the isolation rings, and at the same time, combined with the first limiting groove, the first connection part is effectively covered in the insulating part, thereby improving the insulation effect.

[0015] Preferably, the second connecting portion has a second clearance groove, and one end of the isolation ring is engaged in the second clearance groove.

[0016] By adopting the above technical solution, the setting of the second clearance groove can improve the strength of the connection between the isolation rings, and at the same time, combined with the second limiting groove, the second connection part is effectively covered in the insulating part, thereby improving the insulation effect.

[0017] Preferably, the first connecting portion has at least one first groove spaced along the axial direction on its outer peripheral wall, and the insulating member has a first protruding ring that is engaged in the first groove.

[0018] By adopting the above technical solution, the engagement of the first convex ring and the first groove limits the axial movement of the first connector relative to the insulating component, thereby improving the connection strength between the two.

[0019] Preferably, the first connecting portion has at least one first slot evenly distributed circumferentially at its end face, and the insulating member has a first protrusion that is engaged in the first slot.

[0020] Preferably, the first connecting portion forms a first connecting block and a second connecting block between two adjacent first slots, and a plurality of first connecting blocks and second connecting blocks are spaced apart; wherein, the end of the second connecting block extends inclined inward.

[0021] By adopting the above technical solution, the second connecting block is tilted inward, which can improve the axial pull-out force after injection molding connection with the insulating part. Combined with the connection between the first connecting block and the insulating part, the connection strength between the first connecting part and the insulating part is further improved.

[0022] By adopting the above technical solution, the engagement of the first protrusion and the first slot limits the circumferential rotation of the first connector relative to the insulating component, thereby further improving the connection strength between the two.

[0023] Preferably, the second connector has at least one second groove spaced along the axial direction on its outer peripheral wall, and the insulating member has a second protruding ring that is engaged in the second groove.

[0024] By adopting the above technical solution, the engagement of the second convex ring and the second groove limits the axial movement of the second connector relative to the insulating component, thereby improving the connection strength between the two.

[0025] Preferably, the second connecting portion has at least one second slot evenly distributed circumferentially at its end face, and the insulating member has a second protrusion engaged in the second slot.

[0026] By adopting the above technical solution, the engagement of the second protrusion and the second slot limits the circumferential rotation of the second connector relative to the insulating component, thereby further improving the connection strength between the two.

[0027] Preferably, the second connecting portion forms a third connecting block and a fourth connecting block between two adjacent second slots, and a plurality of third connecting blocks and fourth connecting blocks are spaced apart; wherein, the end of the fourth connecting block extends inclined inward.

[0028] By adopting the above technical solution, the fourth connecting block is tilted inward, which can improve the axial pull-out force after injection molding connection with the insulating part. Combined with the connection between the third connecting block and the insulating part, the connection strength between the second connecting part and the insulating part is further improved.

[0029] Preferably, the internal threaded connector includes an extension ring disposed at one end of the outer peripheral wall, the diameter of the extension ring being larger than the diameter of the second connecting portion.

[0030] By adopting the above technical solution, the extension ring increases the contact area with the insulating component, thereby further improving the connection strength between the extension ring and the insulating component.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. By correspondingly opening a first clearance groove and a second clearance groove on the first connection part and / or the second connection part for the isolation ring on the insulating component to be engaged, the connection strength between the insulating component and the first connecting component and the first connecting component is improved, while the axial distance between the first connecting component and the second connecting component in the air passage is increased, thereby improving the insulation effect;

[0033] 2. By setting the first groove, the second groove, the first slot, and the second slot, the axial and circumferential rotation of the first connector and the second connector relative to the insulating component is limited, thereby further improving the connection strength of the three components. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a gas-insulating connector in Embodiment 1;

[0035] Figure 2 This is a schematic diagram of the insulating component in Example 1;

[0036] Figure 3 This is a schematic diagram of the structure of the first connector in Embodiment 1 from one perspective;

[0037] Figure 4 This is a schematic diagram of the structure of the first connector in Embodiment 1 from another perspective;

[0038] Figure 5 This is a schematic diagram of the structure of the second connector in Embodiment 1.

[0039] Explanation of reference numerals in the attached drawings: 1. First connector; 11. External threaded joint; 12. First connecting part; 13. First clearance groove; 14. First slot; 15. First groove; 2. Second connector; 21. Internal threaded joint; 211. Extension ring; 22. Second connecting part; 23. Second clearance groove; 24. Second slot; 25. Second groove; 3. Insulating component; 31. First limiting groove; 32. Second limiting groove; 33. Protruding ring; 34. Isolating ring; 35. First protruding ring; 36. Second protruding ring; 4. Air passage. Detailed Implementation

[0040] The present application will be further described in detail below with reference to the accompanying drawings.

[0041] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Example 1

[0043] Figure 1 The structure of a gas-insulating connector is shown, including a first connector 1, a second connector 2, and an insulating component 3 for connecting the first connector 1 and the second connector 2. In this embodiment, the first connector 1 and the second connector 2 are both metal connectors, and the insulating component 3 is a plastic insulating component 3. The three are connected by an injection molding process. The first connector 1 includes an external threaded connector 11 and a first connecting portion 12 extending outward from one end of the external threaded connector 11; the second connector 2 includes an internal threaded connector 21 and a second connecting portion 22 extending towards the first connecting portion 12 from one end of the internal threaded connector 21. The external threaded connector 11 is used to connect to a gas bellows, and the internal threaded connector 21 is used to connect to a connector on a gas appliance. The entire insulating connector also has a hollow gas passage 4 for conveying gas.

[0044] Combination Figure 2 The insulating component 3 has a first limiting groove 31 and a second limiting groove 32 with an opening on one side in two sections. A convex ring 33 is provided between the first limiting groove 31 and the second limiting groove 32 to separate them. The convex ring 33 extends radially inward along the air passage 4, and an isolation ring 34 is connected to the inner wall of the convex ring 33. The isolation ring 34 extends radially on both sides of the convex ring 33.

[0045] The first connecting part 12 is engaged within the first limiting groove 31, and one end of the isolation ring 34 circumferentially surrounds the inner wall of the first connecting part 12. The second connecting member 2 is entirely engaged within the second limiting groove 32, and one end of the isolation ring 34 circumferentially surrounds the inner wall of the second connecting part 22. The isolation ring 34 covers the first connecting part 12 and part of the second connecting part 22. The height L of the isolation ring 34 is equal to the axial distance between the first connecting member 1 and the second connecting member 2 within the air passage 4. The larger this axial distance, the greater the current creepage distance and the better the insulation effect. At the same time, due to the setting of the isolation ring 34, insulation can be guaranteed without increasing the thickness of the convex ring 33, the overall height of the insulating member 3 can be controlled, and the connection strength between the insulating member 3 and the first connecting member 1 and the second connecting member 2 can also be improved.

[0046] Combination Figures 3 to 5The first connecting part 12 has a first clearance groove 13 at its end, and one end of the isolation ring 34 is engaged in the first clearance groove 13; the second connecting part 22 has a second clearance groove 23 at its end, and the other end of the isolation ring 34 is engaged in the second clearance groove 23.

[0047] Meanwhile, the first connecting part 12 is provided with a plurality of circumferentially distributed first slots 14 at its end position, and the convex ring 33 is provided with a first protrusion at its end face that engages with the first slots 14; the second connecting part 22 is provided with a plurality of circumferentially distributed second slots 24 at its end position, and the convex ring 33 is provided with a second protrusion at its other end face that engages with the second slots 24.

[0048] The first connecting portion 12 has at least one first groove 15 spaced apart along the axial direction on its outer peripheral wall, and the second connecting member 2 has at least one second groove 25 spaced apart along the axial direction on its outer peripheral wall. In this embodiment, both the first groove 15 and the second groove 25 are annular grooves and there are more than two of them. The first limiting groove 31 has a first protruding ring 35 on its inner wall that engages with the first groove 15, and the second limiting groove 32 has a second protruding ring 36 on its inner wall that engages with the second groove 25. Thus, the first connecting member 1 and the second connecting member 2 are limited in axial and circumferential rotation relative to the insulating member 3, and the connection strength is improved.

[0049] In this embodiment, the internal threaded connector 21 also includes an extension ring 211 disposed at one end of the outer peripheral wall. The diameter of the extension ring 211 is larger than the diameter of the second connecting part 22. Since the second connecting part 2 is fixed in the second limiting groove 32, the extension ring 211 can better increase the contact area with the insulating part 3, and further improve the connection strength between the two. Example 2

[0050] A gas-insulating connector differs from Embodiment 1 in that a first connecting block and a second connecting block are formed on the first connecting part 12 between two adjacent first slots 14. A plurality of first connecting blocks and second connecting blocks are arranged at intervals. The end of the second connecting block extends inclinedly toward the first relief groove 13, i.e., inward. Therefore, when the first connecting part 12 is connected to the insulating member 3, the inclined arrangement of the second connecting block increases the axial pull-out force between it and the insulating member, further improving the connection strength between the first connecting member 1 and the insulating member 3.

[0051] Similarly, a third connecting block and a fourth connecting block are formed on the second connecting part 22 between two adjacent second slots 24, wherein the end of the fourth connecting block extends inclinedly toward the second relief slot 23 side, i.e., inward, thereby increasing the pull-out force between the second connecting member 2 and the insulating member 3 and improving the connection strength.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An insulating connector for gas applications, characterized in that, include: The first connector (1) includes an external threaded connector (11) and a first connecting portion (12) extending outward from one end of the external threaded connector (11). The second connector (2) includes an internal threaded connector (21) and a second connector (22) extending from one end of the internal threaded connector (21) toward the first connector (12); and The insulating member (3) has a first limiting groove (31) for receiving the first connecting part (12) and a second limiting groove (32) for receiving the second connecting member (2); The insulating member (3) includes a convex ring (33) placed between the first limiting groove (31) and the second limiting groove (32) and an isolation ring (34) extending radially outward from the inner wall of the convex ring (33), the isolation ring (34) circumferentially surrounding the inner wall of the first connecting portion (12) and / or the second connecting portion (22).

2. The gas-insulating connector according to claim 1, characterized in that, The first connecting part (12) has a first clearance groove (13), and one end of the isolation ring (34) is engaged in the first clearance groove (13).

3. A gas-insulating connector according to claim 1 or 2, characterized in that, The second connecting part (22) has a second clearance groove (23), and one end of the isolation ring (34) is engaged in the second clearance groove (23).

4. A gas-insulating connector according to claim 1, characterized in that, The first connecting part (12) has at least one first groove (15) spaced along the axial direction on its outer peripheral wall, and the insulating member (3) has a first protruding ring (35) that is engaged in the first groove (15).

5. A gas-insulating connector according to claim 1 or 4, characterized in that, The first connecting part (12) has at least one first slot (14) evenly distributed around its end face, and the insulating member (3) has a first protrusion that is engaged in the first slot (14).

6. A gas-insulating connector according to claim 5, characterized in that, The first connecting part (12) forms a first connecting block and a second connecting block between two adjacent first slots (14), and a plurality of first connecting blocks and second connecting blocks are spaced apart; wherein the end of the second connecting block extends inclined inward.

7. A gas-insulating connector according to claim 1 or 4, characterized in that, The second connector (2) has at least one second groove (25) spaced along the axial direction on its outer peripheral wall, and the insulating member (3) has a second protruding ring (36) that is engaged in the second groove (25).

8. A gas-insulating connector according to claim 6, characterized in that, The second connecting part (22) has at least one second slot (24) evenly distributed around its end face, and the insulating member (3) has a second protrusion that is engaged in the second slot (24).

9. A gas-insulating connector according to claim 8, characterized in that, The second connecting part (22) forms a third connecting block and a fourth connecting block between two adjacent second slots (24), and a plurality of third connecting blocks and fourth connecting blocks are spaced apart; wherein the end of the fourth connecting block extends inward at an angle.

10. A gas-insulating connector according to claim 1, characterized in that, The internal threaded connector (21) includes an extension ring (211) located at one end of the outer peripheral wall, the diameter of which is larger than the diameter of the second connecting part (22).

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