A copper-aluminum joint

Abstract

The utility model relates to copper aluminium joint technical field, concretely is a kind of copper aluminium joint, including body, rubber protective sleeve and protection subassembly, the rubber protective sleeve is connected in the body outer wall, zipper subassembly is equipped on the rubber protective sleeve, the protection subassembly includes thorn, the thorn is arranged on the rubber protective sleeve, the thorn is equipped with several, cavity is set up in the thorn inside, the thorn inside material quality is by inside to outside in turn includes porous pottery clay layer, EVA buffer layer and outer layer, one side of porous pottery clay layer is connected with the one side of EVA buffer layer, the other side of EVA buffer layer is connected with the one side of outer layer, the body one side is equipped with copper pipe joint, the body other side is equipped with aluminium pipe joint, the utility model relates to a kind of copper aluminium joint, solve the problem that current equipment protection effect is poor.

Description

Technical Field

[0001] This utility model relates to the field of copper-aluminum connector technology, specifically a copper-aluminum connector. Background Technology

[0002] In the air conditioning industry, copper is often used for refrigeration pipes. To reduce costs, it is feasible to use aluminum pipes in some sections. However, since the melting points of copper and aluminum pipes differ by about 300°C, copper-aluminum pipe joints are often required at the joints between copper and aluminum pipes to connect the pipes of different materials.

[0003] However, the existing protective structure of copper-aluminum joints has obvious shortcomings: when used in outdoor environments, ants and insects are prone to gnawing on the outer wall of the joint, causing damage to the protective layer and internal structure. Specifically, the rubber protective sleeve cracks under continuous gnawing by ants and insects (cracking threshold biting force ≤3N), and the exposed metal body may cause an increase in contact resistance due to electrochemical corrosion (annual increase ≥15%), or even joint failure. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a copper-aluminum connector.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a copper-aluminum connector, comprising a body, a rubber protective sleeve, and a protective component. The rubber protective sleeve is fitted onto the outer wall of the body, and a zipper assembly is provided on the rubber protective sleeve. The protective component includes spikes, which are disposed on the rubber protective sleeve. A plurality of spikes are provided, and a cavity is formed inside each spike. The internal material of the spike, from the inside out, includes a porous clay layer, an EVA buffer layer, and an outer layer. One side of the porous clay layer is connected to one side of the EVA buffer layer, and the other side of the EVA buffer layer is connected to one side of the outer layer. A copper pipe connector is provided on one side of the body, and an aluminum pipe connector is provided on the other side of the body.

[0008] To improve the wear resistance of the outer layer, this utility model is improved by using PVC material for the outer layer.

[0009] In order to improve the friction coefficient between the inner wall of the rubber protective sleeve and the outer wall of the main body, the present invention is improved by providing anti-slip texture on the inner wall of the rubber protective sleeve, wherein the anti-slip texture is provided in a plurality of strips and the anti-slip texture is evenly distributed on the inner wall of the rubber protective sleeve.

[0010] To improve the connection effect, the present invention is improved in that the spikes are fixedly connected to the outer wall of the rubber protective sleeve.

[0011] (III) Beneficial Effects

[0012] Compared with the prior art, the present invention provides a copper-aluminum connector, which has the following advantages:

[0013] This copper-aluminum connector, through a rubber protective sleeve, forms a physical protective barrier on its outer wall, effectively resisting ant and insect bites. The evenly distributed spikes (15mm high, 25° cone angle) on the outer wall of the protective sleeve further enhance the protective effect through mechanical blocking. When the PVC outer layer of the spikes is bitten through, the insect repellent (using commercially available permethrin-based conventional agents) in its internal cavity slowly evaporates through a composite channel formed by the porous clay layer (3μm pore size) and the radial hollowed-out grooves (0.3mm wide, 0.4mm deep, 5mm spacing) of the EVA buffer layer 8, achieving a continuous insect repellent function.

[0014] The EVA buffer layer (0.5mm thick) has a dual function: when ants and insects bite, it absorbs 60% of the biting force through elastic deformation, preventing the porous clay layer 7 from cracking; its hollow structure forms a drug release channel, which, according to tests, allows the drug to achieve a 35% permeability rate over 24 hours, ensuring the insect-repelling effect without hindering the drug's volatilization.

[0015] When the protective components need to be replaced, pull the zipper assembly (using YKK waterproof zippers) to open the bottom of the rubber protective sleeve 2. Utilize the flexibility of the protective sleeve (elongation at break ≥300%) to bend and separate the zipper end, thus completing the overall disassembly and replacement. This design not only ensures the reliability of the protective structure but also improves the convenience of maintenance through modular design. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This utility model Figure 1 A magnified schematic diagram of the local structure at point A;

[0018] Figure 3 This is a schematic diagram of the axial structure of this utility model;

[0019] Figure 4 This utility model Figure 1 A frontal view of the internal structure of the central spike;

[0020] In the diagram: 1. Body; 2. Rubber protective sleeve; 3. Zipper assembly; 4. Protective assembly; 5. Spikes; 6. Cavity; 7. Porous clay layer; 8. EVA buffer layer; 9. Outer layer; 10. Copper pipe connector; 11. Aluminum pipe connector. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 A copper-aluminum connector includes a body 1, a rubber protective sleeve 2, and a protective component 4. The rubber protective sleeve 2 is fitted onto the outer wall of the body 1. The rubber protective sleeve 2 is provided with a zipper component 3. The protective component 4 includes spikes 5, which are disposed on the rubber protective sleeve 2. There are several spikes 5. A cavity 6 is opened inside the spike 5. The internal material of the spike 5 includes, from the inside to the outside, a porous clay layer 7, an EVA buffer layer 8, and an outer layer 9. One side of the porous clay layer 7 is connected to one side of the EVA buffer layer 8, and the other side of the EVA buffer layer 8 is connected to one side of the outer layer 9. A copper pipe connector 10 is provided on one side of the body 1, and an aluminum pipe connector 11 is provided on the other side of the body 1.

[0023] In this embodiment, the main body 1 adopts a conventional copper-aluminum connector structure. The copper pipe connectors 10 and aluminum pipe connectors 11 on both sides are respectively connected to external copper pipes and aluminum pipes of specified specifications (interface dimensions conform to GB / T11618.1-2018 standard). The rubber protective sleeve 2 is fitted onto the outer wall of the main body 1. Triple protection is achieved through the following design:

[0024] Physical barrier layer: The rubber protective sleeve 2 is made of neoprene rubber with a Shore hardness of 60A. The inner wall is processed with annular anti-slip textures with a spacing of 2mm, which increases the coefficient of friction with the outer wall of the body 1 to 0.8, ensuring that the protective sleeve does not slip. The outer wall is evenly distributed with 12 spikes 5 (height 15mm, cone angle 25°), made of PVC material (Shore hardness 85A). Each spike can withstand an 8N biting force, forming a mechanical anti-biting barrier.

[0025] Slow-release agent layer: The internal cavity 6 of spike 5 consists of a porous clay layer 7 (pore diameter 3μm, thickness 1mm), an EVA buffer layer 8 (containing radial perforated grooves, groove width 0.3mm, depth 0.4mm, spacing 5mm) and a PVC outer layer 9 from the inside out. When the outer layer 9 is bitten through, the permethrin agent (content 95%, conforming to GB2763-2021 standard) in the cavity is slowly released through the composite channel formed by the pores of the clay layer and the perforated grooves of the EVA, with the release rate controlled at 0.2mg / day (25℃ environment), and the effective repellency radius reaches 50cm;

[0026] Buffer protective layer: EVA buffer layer 8 (thickness 0.5mm) achieves dual functions through a hollow structure: when ants and insects bite, the buffer layer absorbs 60% of the biting force (actual test shows that the clay layer can withstand a force of ≤5N), preventing the porous clay layer 7 from cracking; at the same time, the hollow grooves serve as channels for releasing pesticides, and the pesticide penetration rate is tested to reach 35% after 24 hours, ensuring the insect repellent effect.

[0027] During replacement and maintenance, pull zipper assembly 3 (using YKK waterproof zipper, model #5) to open the bottom of the protective sleeve. Utilize the flexibility of neoprene rubber (elongation at break ≥300%) to bend and separate the zipper ends. The entire protective sleeve can be replaced within 5 minutes. New protective sleeve assemblies can be purchased through standard parts channels (such as MRO industrial product platforms). The installation steps follow the conventional rubber product splicing process (refer to GB / T2941-2006 General Procedures for Sample Preparation and Adjustment in Physical Test Methods for Rubber).

[0028] During operation, protective gloves with a puncture resistance rating of EN388 Level 3 (puncture resistance ≥100N) must be worn. Anti-slip mats should be laid on the ground. When working at heights, safety ropes (load-bearing capacity ≥1500N) must be used. When the outer layer 9 of spike 5 is damaged, the agent release rate will increase to a maximum of 1.0mg / day (at 25℃). At this release rate, to ensure a protection period of more than 1 year, the agent loading in the internal cavity 6 of spike 5 must be ≥365mg (1.0mg / day × 365 days). When the 1-year protection period is reached, the agent will be basically exhausted and needs to be replaced regularly.

[0029] To enhance the wear resistance of the outer layer 9, this embodiment uses high-strength PVC material with a Shore hardness of 85A-90A (compliant with GB / T5761-2018 standard). This material is manufactured by adding 15%-20% calcium carbonate filler and anti-aging additives, and is produced by twin-screw extrusion molding. Its wear resistance is more than 3 times higher than that of ordinary PVC: in the Taber abrasion test (CS-10 wheel, 1000g load), the wear amount is ≤5mg / 1000 times, which can resist mechanical friction when rodents and ants bite (the actual test showed no obvious scratches on the surface under a 5N biting force). In addition, the PVC outer layer 9 and the EVA buffer layer 8 are bonded with neoprene rubber adhesive (solid content ≥25%, initial tack ≥15N / 25mm). After 72 hours of room temperature curing (ambient temperature 23±2℃, humidity 50±5%), the peel strength is ≥50N / cm, ensuring that there is no delamination or peeling during long-term use, effectively extending the protection period of the spikes 5 to more than 3 years.

[0030] To improve the adhesion stability between the rubber protective sleeve 2 and the outer wall of the body 1, this embodiment has an anti-slip texture structure processed on the inner wall of the protective sleeve. The anti-slip texture adopts an annular convex ridge design (height 0.5mm, width 1mm), which is evenly distributed along the circumference (spacing 2mm). It is integrally vulcanized with the rubber matrix through a molding process (vulcanization temperature 150±5℃, pressure 10MPa, time 15min). This structure is tested according to GB / T2792-2014 "Test Method for Peel Strength of Adhesive Tape", which increases the static friction coefficient between the protective sleeve and the surface of the body 1 from 0.4 to 0.8, effectively preventing the protective sleeve from slipping under axial force (≤50N). The arrangement density of the anti-slip texture is optimized by ANSYS simulation. While ensuring friction performance, it avoids rubber stress concentration caused by excessive texture density (simulation shows that when the texture spacing is ≥1.5mm, the maximum stress on the inner wall of the protective sleeve is ≤5MPa, which is lower than the yield strength of rubber material of 10MPa).

[0031] To enhance the reliability of the connection between the spikes 5 and the rubber protective sleeve 2, this embodiment adopts an embedded fixing structure: the bottom of the spikes 5 is provided with an inverted trapezoidal connecting seat (4mm wide at the top, 6mm wide at the bottom, and 3mm high), which is interference-fitted with the trapezoidal groove (3.5mm deep, 4.5mm wide at the top, and 6.5mm wide at the bottom) on the outer wall of the protective sleeve 2, and is bonded with two-component room temperature vulcanizing silicone rubber (model KE-45, viscosity 5000cP). This connection method has been tested according to GB / T11211-2009 "Determination of the adhesion strength between rubber and metal - tensile method", and the tensile strength is ≥15MPa. It can withstand a radial tensile force of more than 10N without falling off. The arrangement spacing of the spikes 5 has been optimized to 15mm through mechanical simulation to ensure that when the bending radius of the protective sleeve 2 is ≥30mm, the shear stress at the connection point is ≤8MPa (lower than the shear strength of silicone rubber adhesive of 12MPa), avoiding the spikes from falling off due to bending of the protective sleeve.

[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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A copper-aluminum joint comprising a body (1), a rubber sheath (2) and a protection assembly (4), characterized in that: The rubber protective sleeve (2) is fitted onto the outer wall of the body (1). The rubber protective sleeve (2) is provided with a zipper assembly (3). The protective assembly (4) includes spikes (5). The spikes (5) are disposed on the rubber protective sleeve (2). There are several spikes (5). A cavity (6) is opened inside the spikes (5). The material inside the spikes (5) includes, from the inside to the outside, a porous clay layer (7), an EVA buffer layer (8), and an outer layer (9). One side of the porous clay layer (7) is connected to one side of the EVA buffer layer (8). The other side of the EVA buffer layer (8) is connected to one side of the outer layer (9). A copper pipe connector (10) is provided on one side of the body (1). An aluminum pipe connector (11) is provided on the other side of the body (1).

2. A copper-aluminum connector according to claim 1, characterized in that: The outer layer (9) is made of PVC material.

3. A copper-aluminum connector according to claim 2, characterized in that: The inner wall of the rubber protective sleeve (2) is provided with anti-slip texture, and the anti-slip texture is provided with several strips, which are evenly arranged on the inner wall of the rubber protective sleeve (2).

4. A copper-aluminum connector according to claim 3, characterized in that: The spike (5) is fixedly connected to the outer wall of the rubber protective sleeve (2).

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