Movable joint for building gas aluminum-plastic composite pipe

Abstract

The utility model provides a movable joint for a building gas aluminum-plastic composite pipe, which relates to the technical field of gas movable joints and comprises a movable joint body, the outer walls of the two sides of the movable joint body are respectively and fixedly connected with a connecting mechanism, and each connecting mechanism comprises a fixed pipe fixedly connected to the outer walls of the two sides of the movable joint body. A sliding groove is formed in the outer wall of one side of the fixing pipe, a reset spring is connected to one side of the outer wall of the sliding groove, a groove is formed in the sliding groove, a steel ball is movably connected to the inner wall of the sliding groove, a sealing ring is fixedly connected to one side of the inner wall of the fixing pipe, a sleeve is movably connected to the outer wall of one side of the fixing pipe, and a sliding block is fixedly connected to one side of the inner wall of the sleeve. The gas movable joint solves the problems that an existing gas movable joint is complex in connection and prone to falling off, and sealing materials are not resistant to corrosion, so that potential safety hazards are caused.

Description

Technical Field

[0001] This utility model relates to the field of gas fitting technology, and in particular to a fitting for building gas aluminum-plastic composite pipes. Background Technology

[0002] Due to its lightweight, corrosion resistance, and flexible installation characteristics, aluminum-plastic composite pipes for building gas have become a core material for upgrading urban gas pipeline networks. According to statistics from the International Gas Union (IGU), more than 80% of newly built residential buildings worldwide use this type of pipe (annual consumption exceeds 1.2 billion meters). However, the reliability and sealing performance of the union joint of the composite pipe, as a key stress node in the pipeline system, directly affect the risk of gas leakage. Data shows that 25% of indoor gas accidents originate from joint connection failures, with aluminum-plastic pipe joint leaks accounting for as much as 63% (due to the propagation of microcracks caused by the difference in thermal expansion coefficients at the metal / plastic interface). The current ISO 17885 standard requires gas union joints to maintain a dynamic sealing performance of 0.6 MPa pressure (helium leak detection rate < 1 × 10⁻⁶ mbar·L / s) under operating conditions from -20℃ to 60℃, but significant technical bottlenecks exist in practical applications.

[0003] Current mainstream union technology suffers from three major drawbacks: First, mechanical clamp connections require specialized flaring tools (such as AP-type crimping pliers) for installation, and the construction time for a single-point joint can be as long as 15 minutes (ASTM). The F2023 test procedure data is not applicable, and it is difficult to implement in confined spaces such as high-altitude pipe wells; secondly, the elastic clamping structure relies on the radial preload of the stainless steel spring sheet (design load 120N±15%), but when the pipe is thermally expanded (linear expansion coefficient 23.5×10-6 / ℃) or subjected to lateral vibration (frequency 5-20Hz), a creep gap of 0.2-0.5mm will be generated between the claw and the pipe wall, resulting in a sharp drop in tensile strength of 67% (ISO11439 fatigue test results); thirdly, the sealing system mostly uses a single EPDM rubber ring, which meets the short-term sealing requirements, but after long-term exposure to sulfur-containing media in the gas (H2S concentration > 50ppm), it will swell and age (Shore hardness decreases by 40%), causing the annual increase in the permeability of the sealing interface to reach 2.4×10-3μL / min·m. More seriously, traditional snap-fit ​​joints are prone to axial retraction displacement of 0.3-0.7 mm under negative pressure conditions in pipelines (such as when an emergency shut-off valve is activated) due to the material memory effect, becoming a continuous source of micro-leakage (methane escape rate reaches 0.37 m³). 3 / Year·Connector). Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide a flexible joint for aluminum-plastic composite gas pipes in buildings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a union for building gas aluminum-plastic composite pipes, comprising: a union body, wherein a connecting mechanism is fixedly connected to the outer walls on both sides of the union body;

[0006] The connecting mechanism includes a fixed tube fixedly connected to the outer walls of both sides of the union body. A groove is provided on one side of the outer wall of the fixed tube. A return spring is connected to one side of the outer wall of the groove. A slot is provided on the groove, and a steel ball is movably connected to the inner wall. A sealing ring is fixedly connected to one side of the inner wall of the fixed tube. A sleeve is movably connected to one side of the outer wall of the fixed tube, and a slider is fixedly connected to one side of the inner wall of the sleeve.

[0007] In a preferred embodiment, the connecting mechanism is movably connected to an aluminum-plastic composite pipe body on the side away from the union body. A slot is provided on one side of the outer wall of the aluminum-plastic composite pipe body, a sealing groove is provided on one side of the outer wall of the aluminum-plastic composite pipe body, and a pointed groove is provided at the end of the aluminum-plastic composite pipe body near the union body.

[0008] In a preferred embodiment, the annular array of steel balls consists of eight balls, which are evenly distributed on one side of the outer wall of the chute.

[0009] In a preferred embodiment, the sleeve is disposed on one side of the outer wall of the return spring, and a slider disposed on one side of the inner wall of the sleeve is correspondingly connected to one side of the return spring.

[0010] In a preferred embodiment, the slider on one side of the inner wall of the sleeve is connected to eight steel balls on the outer wall of the slide groove.

[0011] In a preferred embodiment, the inner wall of the steel ball on one side of the outer wall of the chute is engaged with the slot on the outer wall of the aluminum-plastic composite pipe body.

[0012] In a preferred embodiment, the aluminum-plastic composite pipe body is movably connected to one side of the inner wall of the fixed pipe, and the outer wall of one side of the aluminum-plastic composite pipe body is provided with three sealing grooves, all of which are connected to the sealing rings provided on the inner wall of the fixed pipe.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. In use, this utility model provides a quick connection and disassembly function through the cooperation of components such as the union body, fixed pipe, sliding groove, steel ball, and sleeve. Users can connect or disconnect the steel ball from the aluminum-plastic composite pipe body by sliding the sleeve. This mechanism simplifies installation and maintenance, reduces operation time, and ensures the fixation of the aluminum-plastic composite pipe body and prevents it from falling off through the cooperation of the slider and steel ball. When the slider pushes the steel ball, the steel ball is pushed into the groove on the aluminum-plastic composite pipe body, thereby limiting the pipe and preventing it from slipping due to external force. This limiting design makes the pipe more stable during connection, improving the overall safety and reliability of the device.

[0015] 2. In use, the design of the sealing ring and sealing groove ensures a good seal at the connection between the aluminum-plastic composite pipe body and the fixed pipe. The sealing ring is made of corrosion-resistant rubber, which enhances the sealing effect and prevents leakage of gas or other fluids.

[0016] 3. In use, both the fixed pipe and the aluminum-plastic composite pipe body in this device are treated with an anti-corrosion coating (such as nickel plating, zinc plating, or ceramic coating) to improve their corrosion resistance, moisture resistance, and oxidation resistance. This treatment can effectively prevent corrosion or aging of the pipeline due to environmental changes. Especially in the use of gas pipelines, long-term contact with oxygen, moisture, and other environmental factors may accelerate corrosion, causing leaks or damage. Attached Figure Description

[0017] Figure 1 This utility model provides a schematic diagram of the external structure of a union joint for building gas aluminum-plastic composite pipes.

[0018] Figure 2 This is a partial disassembly diagram of a union joint for aluminum-plastic composite gas pipes in buildings, provided by this utility model.

[0019] Figure 3 This is a cross-sectional disassembly diagram of a union for aluminum-plastic composite gas pipes in buildings, provided by this utility model.

[0020] Figure 4 This utility model provides a cross-sectional disassembly diagram of the connection mechanism of a union for aluminum-plastic composite gas pipes in buildings.

[0021] Legend:

[0022] 1. Union connector body; 2. Connecting mechanism; 3. Aluminum-plastic composite pipe body; 4. Slot; 5. Sealing groove; 6. Pointed nozzle groove;

[0023] 21. Fixed tube; 22. Slide groove; 23. Return spring; 24. Steel ball; 25. Sealing ring; 26. Sleeve; 27. Slider. Detailed Implementation

[0024] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0025] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0026] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected through a transitional structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] Example 1

[0030] like Figure 1-4 As shown, this utility model provides a technical solution: a union for building gas aluminum-plastic composite pipes, including: a union body 1, and a connecting mechanism 2 fixedly connected to the outer walls on both sides of the union body 1;

[0031] The connecting mechanism 2 includes a fixed tube 21 fixedly connected to the outer walls of both sides of the union body 1. A groove 22 is provided on one side of the outer wall of the fixed tube 21. A return spring 23 is connected to one side of the outer wall of the groove 22. A slot is provided on the groove 22, and steel balls 24 are movably connected to the inner wall. Eight steel balls 24 are arranged in a ring array and are evenly distributed on one side of the outer wall of the groove 22. A sealing ring 25 is fixedly connected to one side of the inner wall of the fixed tube 21. A sleeve 26 is movably connected to one side of the outer wall of the fixed tube 21. A slider 27 is fixedly connected to one side of the inner wall of the sleeve 26. The sleeve 26 is located on one side of the outer wall of the return spring 23, and the slider 27 on one side of the inner wall of the sleeve 26 is correspondingly connected to one side of the return spring 23. The slider 27 on one side of the inner wall of the sleeve 26 is correspondingly connected to the eight steel balls 24 on one side of the outer wall of the groove 22.

[0032] In this embodiment, a union body 1 is designed, and a connecting mechanism 2 is fixedly connected to the outer walls of both sides of the union body 1. The connecting mechanism 2 includes a fixed tube 21. A groove 22 is formed on the outer wall of the fixed tube 21 away from the union body 1. Therefore, the fixed tube 21 is high at both ends and concave in the middle. A return spring 23 is connected to the outer wall of the groove 22 near the union body 1. Eight grooves are arranged in a ring on the outer wall of the groove 22 away from the return spring 23, and a steel ball 24 is movably connected to the inner wall of each of the eight grooves. Three sealing rings 25 are fixedly connected to one side of the inner wall of the fixed tube 21. The sealing rings 25 are made of corrosion-resistant rubber. A sleeve 26 is provided on one side of the outer wall of the fixed tube 21. A sleeve 26 is fixedly connected to one side of the inner wall of the sleeve 26. A slider 27 is connected to a groove 22 on the outer wall of the fixed tube 21. One end of the slider 27 is movably connected to one end of a return spring 23. Therefore, the return spring 23 is located between one side of the slider 27 and one side of the inner wall of the groove 22, away from the steel ball 24. Under normal circumstances, the slider 27 is subjected to the force of the return spring 23, which causes the slider 27 to squeeze the steel ball 24 on the outer wall of the groove 22. When the sleeve 26 is placed on the outer wall of the fixed tube 21 and slid towards one end of the union body 1, the sleeve 26 will squeeze the return spring 23. At this time, the sleeve 26 will leave the steel ball 24. The steel ball 24 will lack the squeezing force of the sleeve 26 and will shift outward, thus connecting with the external pipe. Conversely, it can be fixedly installed.

[0033] Example 2

[0034] like Figure 1-2As shown, the connecting mechanism 2 is movably connected to the aluminum-plastic composite pipe body 3 on the side away from the union body 1. A groove 4 is provided on the outer wall of one side of the aluminum-plastic composite pipe body 3. The inner wall of the steel ball 24 provided on the outer wall of one side of the sliding groove 22 engages with the groove 4 provided on the outer wall of one side of the aluminum-plastic composite pipe body 3. A sealing groove 5 is provided on the outer wall of one side of the aluminum-plastic composite pipe body 3. The aluminum-plastic composite pipe body 3 is movably connected to the inner wall of the fixed pipe 21. Three sealing grooves 5 are provided on the outer wall of one side of the aluminum-plastic composite pipe body 3, which are all connected to the sealing rings 25 provided on the inner wall of the fixed pipe 21. A pointed groove 6 is provided at the end of the aluminum-plastic composite pipe body 3 near the union body 1.

[0035] In this embodiment, an aluminum-plastic composite pipe body 3 is connected to one side of the inner wall of the fixed pipe 21, extending to the inner wall of the fixed pipe 21. The groove 4 on its outer wall corresponds to the steel ball 24 on the outer wall of the slide groove 22. When the slider 27 acts on the steel ball 24, it pushes the steel ball 24 inward. At this time, the steel ball 24 acts on the groove 4 on the outer wall of the aluminum-plastic composite pipe body 3, thereby limiting the aluminum-plastic composite pipe body 3 and preventing it from falling off during installation and use. This method allows for quick and convenient disassembly and installation of the aluminum-plastic composite pipe body 3, facilitating replacement and maintenance. A pointed groove 6 is provided at the end of the aluminum-plastic composite pipe body 3 near the union body 1. The pointed groove 6 has... The chamfering facilitates the insertion of the aluminum-plastic composite pipe body 3 into the inner wall of the fixed pipe 21. Three sealing grooves 5 are provided on the outer wall of one side of the aluminum-plastic composite pipe body 3. These three sealing grooves 5 can be connected to three sealing rings 25 opened on one side of the inner wall of the fixed pipe 21 to achieve a sealing effect. This prevents gas from leaking from the connection between the fixed pipe 21 and the aluminum-plastic composite pipe body 3 during use, thus avoiding safety hazards. Both the fixed pipe 21 and the aluminum-plastic composite pipe body 3 can be treated with anti-corrosion coatings (such as nickel plating, zinc plating, ceramic coating, etc.) on the joint surface to improve their resistance to environmental factors such as gas, moisture, and oxidation. This method improves the long-term stability and reliability of the device and reduces maintenance and replacement costs.

[0036] Working principle:

[0037] like Figure 1-4As shown, the working principle of this device mainly relies on the precise cooperation of the union body 1, the connecting mechanism 2, the sealing device, and the aluminum-plastic composite pipe body 3. Through the design of sliding, spring return, and steel ball 24 limiting, it ensures reliable connection, sealing, and convenient disassembly and assembly of the pipeline. First, the core part of the device is the union body 1. The connecting mechanism 2 is fixedly connected to both sides of the union body 1 through the fixed pipe 21. The inner wall of the fixed pipe 21 is provided with multiple sealing rings 25 to ensure that no leakage occurs during the connection process. The outer wall of the fixed pipe 21 is provided with a groove 22, which is concave. The groove 22 cooperates with the slider 27 on the sleeve 26. A return spring 23 is installed on one side of the groove 22 near the union body 1. The return spring 23 usually keeps the slider 27 in position, so that it is in contact with the steel ball 24 on the outer wall of the groove 22, thereby maintaining the stability of the connection. When the sleeve 26 slides along the fixed pipe 21, it will squeeze the return spring 23, causing the slider 27 to lose contact with the steel ball 24, and the steel ball 24 will shift outward. At this point, the offset of the steel ball 24 allows the device to connect with the external pipeline and provides a secure interface; conversely, it allows for fixed installation. Through this sliding operation, the slot 4 of the aluminum-plastic composite pipe body 3 and the steel ball 24 can achieve rapid connection and positioning, preventing the pipe from falling off. Furthermore, one end of the aluminum-plastic composite pipe body 3 is designed with a pointed groove 6, facilitating precise alignment with the inner wall of the fixed pipe 21. Its outer wall is provided with three sealing grooves 5, which correspond to the sealing ring 25 inside the fixed pipe 21, effectively preventing gas leakage and ensuring system safety. The sealing ring 25 is made of corrosion-resistant rubber to enhance its durability in harsh environments. The entire device can be treated with an anti-corrosion coating (such as nickel plating, zinc plating, ceramic coating, etc.) on the surface of the connection parts to improve its stability and oxidation resistance during long-term use, ensuring efficient operation even in humid, gas-filled, and other harsh environments. Through these designs, the device enables rapid pipe connection and disassembly, facilitating maintenance and replacement, while improving safety and reliability during use. In summary, through ingenious mechanical design and material selection, this device ensures the sealing, robustness, and ease of operation of pipe connections, while significantly extending the service life of the equipment and reducing maintenance costs.

[0038] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0039] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A union fitting for aluminum-plastic composite gas pipes in buildings, comprising a union fitting body (1), characterized in that: A connecting mechanism (2) is fixedly connected to both outer walls of the live connector body (1); The connecting mechanism (2) includes a fixed tube (21) fixedly connected to the outer walls of both sides of the live joint body (1). A groove (22) is provided on one side of the outer wall of the fixed tube (21). A return spring (23) is connected to one side of the outer wall of the groove (22). A slot is provided on the groove (22), and a steel ball (24) is movably connected to the inner wall. A sealing ring (25) is fixedly connected to one side of the inner wall of the fixed tube (21). A sleeve (26) is movably connected to one side of the outer wall of the fixed tube (21). A slider (27) is fixedly connected to one side of the inner wall of the sleeve (26).

2. The union for aluminum-plastic composite gas pipes in buildings according to claim 1, characterized in that: The connecting mechanism (2) is movably connected to the aluminum-plastic composite pipe body (3) on the side away from the union body (1). A slot (4) is provided on the outer wall of one side of the aluminum-plastic composite pipe body (3). A sealing groove (5) is provided on the outer wall of one side of the aluminum-plastic composite pipe body (3). A pointed groove (6) is provided at the end of the aluminum-plastic composite pipe body (3) close to the union body (1).

3. The union for building gas aluminum-plastic composite pipes according to claim 1, characterized in that: The steel balls (24) are arranged in a ring array of eight, and are evenly distributed on one side of the outer wall of the groove (22).

4. A union for building gas aluminum-plastic composite pipes according to claim 1, characterized in that: The sleeve (26) is located on one side of the outer wall of the return spring (23), and the slider (27) located on one side of the inner wall of the sleeve (26) is connected to the return spring (23) on the corresponding side.

5. A union for building gas aluminum-plastic composite pipes according to claim 1, characterized in that: The slider (27) provided on one side of the inner wall of the sleeve (26) is connected to the eight steel balls (24) provided on the outer wall of one side of the groove (22).

6. A union for building gas aluminum-plastic composite pipes according to claim 2, characterized in that: The inner wall of the steel ball (24) on one side of the outer wall of the chute (22) engages with the slot (4) on one side of the outer wall of the aluminum-plastic composite pipe body (3).

7. A union for building gas aluminum-plastic composite pipes according to claim 2, characterized in that: The aluminum-plastic composite pipe body (3) is movably connected to one side of the inner wall of the fixed pipe (21), and three sealing grooves (5) are provided on one side of the outer wall of the aluminum-plastic composite pipe body (3), which are all connected to the sealing rings (25) provided on the inner wall of the fixed pipe (21).

Images