Oil return elbow with welding ring

Abstract

The utility model relates to the field of pipeline component, the utility model discloses a purpose at providing a kind of oil return elbow with welding ring, including first straight pipe, lower elbow pipe, upper elbow pipe and second straight pipe sequentially communicated;The upper elbow pipe and lower elbow pipe are U-shaped structure, and the opening direction of upper elbow pipe and lower elbow pipe is relatively arranged;Welding ring is equipped on the inner wall surface of first straight pipe and / or second straight pipe, for welding connection with external pipeline component.The utility model is simple in structure, convenient for welding, welding interface is uniform, and need not open fire welding operation, only need to utilize high frequency or ultrahigh frequency welding machine welding, can realize the welding of oil return elbow and other pipe fittings.

Description

Technical Field

[0001] This utility model relates to the field of pipeline components, specifically a return oil bend with a welding ring. Background Technology

[0002] In central air conditioning refrigerant piping systems, an oil return bend is typically installed. Its core function is to ensure that the refrigerant oil can smoothly return to the compressor along with the refrigerant, thereby guaranteeing proper lubrication and heat dissipation of the compressor and maintaining long-term stable system operation. If the oil return bend is not properly installed in the system, a large amount of refrigerant oil will remain in the pipes, easily leading to insufficient oil in the compressor, resulting in poor lubrication, accelerated wear, and overheating and burnout. This reduces the operating efficiency of the refrigeration system and causes instability.

[0003] In traditional air conditioning piping installation, open flame welding is typically used to connect the return oil bend to other pipe sections. During installation, installers must carry welding rods, which are melted by a high-temperature open flame to complete the weld. However, this welding method has several drawbacks: First, uneven welding joints are prone to incomplete welds or pinholes, affecting the welding effect and leading to refrigerant leaks. Second, carrying welding rods is inconvenient; forgetting to bring them will delay the project. Furthermore, the use of open flames not only increases the risk of safety accidents, but the high-temperature flame welding can also cause physical deformation of the return oil bend, creating a risk of pipe rupture due to long-term high refrigerant pressure during use. Therefore, it is necessary to develop a simple, easy-to-weld return oil bend with a weld ring and uniform weld joints. Utility Model Content

[0004] The purpose of this utility model is to provide an oil return bend with a welding ring, which has a simple structure, is easy to weld, has a uniform welding interface, and does not require open flame welding. It can be welded to other pipe fittings using only a high-frequency or ultra-high-frequency welding machine.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A return oil bend with a welded ring includes a first straight pipe, a lower bend, an upper bend, and a second straight pipe connected in sequence.

[0007] Both the upper and lower bends are U-shaped structures, and their opening directions are opposite to each other; the inner wall of the first straight pipe and / or the second straight pipe is provided with a welding ring for welding connection with external pipeline components.

[0008] Compared with the prior art, the advantages of this utility model are:

[0009] 1. When using the oil return bend with a welding ring of this utility model for pipe-to-pipe welding, not only is there no need to carry welding rods, but the weld joints are also uniform and the welding effect is good. This pipe fitting can effectively solve the problem of inconvenient oxygen filling for open flame welding in major cities, and also eliminates the risk of explosion during the use of pressure vessels.

[0010] 2. By utilizing the oil return bend with a welding ring of this utility model, technical problems such as poor welding and overheating of copper pipes during manual open flame welding are avoided, as well as the quality risks of refrigerant leakage are also avoided.

[0011] 3. The oil return bend with welding ring of this utility model is easy to install, has low technical requirements, saves costs, has no open flame hazard, requires no welding rod, and does not require oxygen or gas.

[0012] 4. The present invention provides an oil return bend with welding rings, wherein the first and second straight pipes are processed into a stepped shape, and each stepped pipe has a welding ring on its inner wall surface, so that the oil return bend can be assembled and welded with pipes of various types. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention, namely an oil return bend with a welding ring.

[0014] Figure 2 This is a simplified structural diagram of the welding ring of this utility model;

[0015] Figure 3 yes Figure 1 A partial structural cross-sectional view.

[0016] Labeling explanation: 1 First straight pipe, 2 Lower bend pipe, 3 Connecting pipe, 4 Upper bend pipe, 5 Second straight pipe, 6 Weld ring, 61 Chamfer A, 7 Annular expansion part, 71 Chamfer B. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0018] like Figure 1-3 The diagram shown is a schematic representation of an embodiment of the oil return bend with a welding ring provided by this utility model:

[0019] A return oil bend with a welded ring includes a first straight pipe 1, a lower bend 2, an upper bend 4, and a second straight pipe 5 connected in sequence.

[0020] Both the upper bend 4 and the lower bend 2 are U-shaped structures, and the opening directions of the upper bend 4 and the lower bend 2 are arranged opposite to each other; the inner wall surface of the first straight pipe 1 and / or the second straight pipe 5 is provided with a welding ring 6 for welding connection with external pipeline components.

[0021] The solder of the welding ring 6 preferably comprises the following components by weight percentage: 2.0% silver, 7.2% phosphorus, 0.018% cerium, 0.002% indium, 0.48% strontium, and 90.3% No. 1 electrolytic copper.

[0022] The method for fabricating the weld ring 6 using the aforementioned solder includes the following process steps:

[0023] S1. Ingredients: Weigh out each component according to the specified proportions;

[0024] S2. Smelting and casting: First, melt silver, indium, cerium, and strontium into a low-melting-point alloy for later use; put phosphorus and copper into an induction furnace for smelting, heat to 1100-1200℃ to completely melt the copper, stir evenly, cool down, and when the temperature drops to 1000℃, add the prepared low-melting-point alloy, stir evenly until the metal is completely melted, and then cast to form a billet;

[0025] S3. Peeling: Cutting and peeling off impurities and oxide layers from the surface of the cast blank;

[0026] S4. Extrusion molding: Cold extruding the peeled preform into a tube preform;

[0027] S5. Tube drawing: The tube blank is then subjected to multiple cold extrusion drawing processes to form a welded tube of the corresponding specifications;

[0028] S6. Cutting: Use an automatic cutting machine to cut the welding tube into welding ring blanks of the required width;

[0029] S7. Beveling: The weld ring blank is cut and beveled by an automatic beveling machine to form the bevels A61 on the upper and lower edges of the outer wall of the weld ring.

[0030] S8. Cleaning: Clean the oil and impurities from the processing to obtain the welding ring.

[0031] When cleaning, alkaline solution can be used to remove oil stains.

[0032] The solder of the welding ring 6 may also be selected to include the following components by weight percentage:

[0033] (1) Silver 1.9%, Phosphorus 7.1%, Cerium 0.02%, Indium 0.01%, Strontium 0.47%, No. 1 electrolytic copper 90.5%;

[0034] (2) Silver 1.8%, Phosphorus 6.8%, Cerium 0.005%, Indium 0.01%, Strontium 0.485%, No. 1 electrolytic copper 90.9%;

[0035] (3) Silver 2.2%, Phosphorus 7.184%, Cerium 0.015%, Indium 0.001%, Strontium 0.5%, No. 1 electrolytic copper 90.1%;

[0036] (4) Silver 2.2%, phosphorus 7.2%, cerium 0.02%, indium 0.01%, strontium 0.1%, No. 1 electrolytic copper 90.47%.

[0037] Tests showed that the solidus temperature (645±10℃) and liquidus temperature (685±10℃) of the solders at different weight percentages were both determined with regard to measurement error. The solder exhibited good fluidity and excellent wetting properties with the base material during brazing. Wetting performance testing was conducted according to GB / T11364-2008, "Test Method for Wetting Properties of Solder Filler Metals".

[0038] The welding ring 6 can be a welding ring made of solder of different weight percentages as described above, or it can be other welding rings available on the market.

[0039] The first straight pipe 1 and / or the second straight pipe 5 are provided with coaxially distributed annular expansion portions 7, and the welding ring 6 is disposed within the annular expansion portion 7.

[0040] The upper and lower edges of the outer wall of the welding ring 6 are provided with chamfers A61, and the annular enlarged part 7 is provided with chamfers B71 that match the chamfers A61.

[0041] A connecting pipe 3 connects the lower bend 2 and the upper bend 4 (the first straight pipe 1, the lower bend 2, the connecting pipe 3, the upper bend 4, and the second straight pipe 5 are connected as one unit).

[0042] The upper bend 4 is deflected relative to the lower bend 2 with the central axis of the connecting pipe 3 as the axis of rotation, so that the plane formed by the first straight pipe 1, the lower bend 2 and the connecting pipe 3 is not coplanar with the plane formed by the connecting pipe 3, the upper bend 4 and the second straight pipe 5.

[0043] Furthermore, the first straight pipe 1, the lower bend pipe 2, the connecting pipe 3, the upper bend pipe 4, and the second straight pipe 5 can be made of the same material, such as copper or copper alloy. Alternatively, the lower bend pipe 2, the connecting pipe 3, and the upper bend pipe 4 can be made of stainless steel, while the first straight pipe 1 and the second straight pipe 5 can be made of copper or copper alloy.

[0044] The first straight pipe 1 and / or the second straight pipe 5 are stepped pipes with gradually decreasing diameters at the opening, and each step of the pipe has a welding ring 6 on its inner wall surface.

[0045] Each tube step is provided with an annular expansion portion 7 coaxially distributed therewith, and the welding ring 6 is located inside the annular expansion portion 7.

[0046] The general principle of this utility model is as follows:

[0047] Because the first straight pipe 1 and / or the second straight pipe 5 are both stepped and each step has a welding ring 6 on its inner wall, the oil return bend with welding rings of this invention can be welded to pipes of various types. To match the first straight pipe 1 and / or the second straight pipe 5 with the pipe to be connected, simply cut the first straight pipe 1 and / or the second straight pipe 5 to expose the step whose inner diameter matches that of the pipe to be connected, since each step has a welding ring 6. Then, the first straight pipe 1 and / or the second straight pipe 5 can be welded to the pipe to be connected using a high-frequency or ultra-high-frequency welding machine.

[0048] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An oil return elbow with a solder ring, characterized by: It includes a first straight pipe (1), a lower bend pipe (2), an upper bend pipe (4), and a second straight pipe (5) connected in sequence. The upper bend (4) and the lower bend (2) are both U-shaped structures, and the opening directions of the upper bend (4) and the lower bend (2) are arranged opposite to each other; the inner wall surface of the first straight pipe (1) and / or the second straight pipe (5) is provided with a welding ring (6) for welding connection with external pipeline components.

2. The oil return bend with a welded ring according to claim 1, characterized in that: The first straight pipe (1) and / or the second straight pipe (5) are provided with annular expansion portions (7) distributed coaxially, and the welding ring (6) is provided inside the annular expansion portion (7).

3. The oil return bend with a welded ring according to claim 2, characterized in that: The upper and lower edges of the outer wall of the welding ring (6) are provided with chamfers A (61), and the annular enlarged part (7) is provided with chamfers B (71) that match chamfers A (61).

4. The oil return bend with a welded ring according to claim 1, characterized in that: A connecting pipe (3) connects the lower bend (2) and the upper bend (4). The upper bend (4) rotates relative to the lower bend (2) with the central axis of the connecting pipe (3) as the axis of rotation, so that the plane formed by the first straight pipe (1), the lower bend (2) and the connecting pipe (3) is not coplanar with the plane formed by the connecting pipe (3), the upper bend (4) and the second straight pipe (5).

5. The return oil bend with a welded ring according to any one of claims 1 to 4, characterized in that: The first straight pipe (1) and / or the second straight pipe (5) are stepped pipes with gradually decreasing diameters at the openings, and each step of the pipe has a weld ring (6) on its inner wall surface.

6. The oil return bend with a welded ring according to claim 5, characterized in that: Each tube has an annular expansion portion (7) coaxially distributed therewith, and the welding ring (6) is located inside the annular expansion portion (7).

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