A stainless steel pipe welding connection structure

Abstract

The utility model discloses a kind of stainless steel pipe welding connection structure, it is related to welding connection technical field, including stainless steel pipe body, copper pipe body is fixed with copper expansion pipe in one end close to stainless steel pipe body, aluminium pipe body is fixed with aluminium expansion pipe in one end close to stainless steel pipe body, multiple through pull grooves are opened in the inside array of copper expansion pipe far from one end of copper pipe body, stainless steel pipe body is fixed with the outside of one end close to copper pipe body with outside ring, the outside of one end close to copper pipe body with convex edge welding ring material is fixed in outside ring of stainless steel pipe body, stainless steel pipe body is fixed with conical seal ring in one end close to aluminium pipe body, multiple solder columns are inserted in the inside array of conical seal ring.The utility model provides a kind of stainless steel pipe welding connection structure, through convex edge welding ring material, welding ring spare material is evenly fused and welded in copper expansion pipe and multiple through pull grooves inside, and multiple solder columns fused and welded between stainless steel pipe body and aluminium expansion pipe between stainless steel pipe body and aluminium expansion pipe improve bonding area.

Description

Technical Field

[0001] This utility model relates to the field of welding connection technology, and in particular to a welding connection structure for stainless steel pipes. Background Technology

[0002] Currently, in aluminum-to-copper projects, it is not possible to completely replace copper pipes with aluminum pipes. A small section of copper pipe must be retained, so copper and aluminum must be welded together. However, copper and aluminum have different metal reactivity, which can easily create a potential difference. When moisture seeps in, the aluminum pipe will be corroded by the copper pipe, leading to leakage.

[0003] Existing technologies use stainless steel pipes to separate aluminum and copper pipes, thereby effectively avoiding corrosion due to the potential difference between copper and aluminum. However, when the two ends of the stainless steel pipe are directly welded to the welding end faces of the aluminum and copper pipes, the small bonding area between the two leads to low welding strength. Therefore, this application proposes a stainless steel pipe welding connection structure. Utility Model Content

[0004] Based on this, it is necessary to provide a stainless steel pipe welding connection structure to address the aforementioned technical problems. The flared design of the copper and aluminum expansion tubes facilitates the insertion of both ends of the stainless steel pipe into the inner sides of the copper and aluminum expansion tubes, respectively. Furthermore, the sliding guidance of the convex edge welding ring and the through-grooves facilitates the positioning of the stainless steel pipe and the copper expansion tube during insertion. The thick ring with a material catcher effectively covers and blocks the outer sides of the multiple through-grooves. Therefore, when the stainless steel pipe and the copper expansion tube are heated and welded, the convex edge welding ring and welding ring material are evenly fused into the copper expansion tube and the inner sides of the multiple through-grooves. When the stainless steel pipe and the aluminum expansion tube are heated and welded, the conical sealing ring and the load-bearing blocking ring facilitate the fusion of multiple weld columns between the stainless steel pipe and the aluminum expansion tube, increasing the bonding area and effectively improving the overall welding strength and quality.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A stainless steel pipe welding connection structure is used for welding stainless steel pipes to aluminum or copper pipes.

[0007] The device includes a stainless steel tube body, with copper and aluminum tube bodies respectively located at both ends. A copper expansion tube is fixed to the end of the copper tube body near the stainless steel tube body, and an aluminum expansion tube is fixed to the end of the aluminum tube body near the stainless steel tube body. Multiple through-grooves are arrayed inside the end of the copper expansion tube away from the copper tube body. An outer ring is fixed to the outer side of the stainless steel tube body near the copper tube body. A convex edge welding ring is fixed to the outer side of the outer ring near the copper tube body and located outside the stainless steel tube body. The outer side of the convex edge welding ring is slidably connected to the multiple through-grooves. A conical sealing ring is fixed to the outer side of the stainless steel tube body near the aluminum tube body. Multiple solder columns are arrayed inside the conical sealing ring.

[0008] As a preferred embodiment of the stainless steel pipe welding connection structure provided by this utility model, a material-holding thick ring is fixed on the outer side of the mounting outer ring, and the end of the material-holding thick ring away from the mounting outer ring extends to the outer side of multiple through grooves.

[0009] As a preferred embodiment of the stainless steel pipe welding connection structure provided by this utility model, a welding ring preparation is provided at the end of the convex edge welding ring material away from the outer ring and located on the outside of the stainless steel pipe body. The welding ring preparation is fixed to the stainless steel pipe body, the outer side of the welding ring preparation is in contact with the inner side of the copper expansion tube, and the inner side of the thick ring of the material pocket is in contact with the outer side of the copper expansion tube.

[0010] In a preferred embodiment of the stainless steel pipe welding connection structure provided by this utility model, a heat insulation ring is fixed on the outer side of the aluminum expansion tube near the stainless steel pipe body, the outer side of the conical sealing ring is in contact with the inner side of the heat insulation ring, a load-bearing plugging ring is fixed on the outer side of the stainless steel pipe body near the aluminum pipe body, and the ends of the plurality of weld columns away from the conical sealing ring are all in contact with the load-bearing plugging ring.

[0011] In a preferred embodiment of the stainless steel pipe welding connection structure provided by this utility model, the outer side of the bearing plug ring is in contact with the inner side of the aluminum expansion pipe.

[0012] In a preferred embodiment of the stainless steel pipe welding connection structure provided by this utility model, the end of the outer ring near the copper pipe body is fitted with the end of the copper expansion tube away from the copper pipe body, and the end of the conical sealing ring away from the stainless steel pipe body is fitted with the end of the aluminum expansion tube away from the aluminum pipe body.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The stainless steel pipe welding connection structure provided by this utility model, through the flaring design of the copper and aluminum expansion tubes, makes it easy for both ends of the stainless steel pipe to be inserted into the inner sides of the copper and aluminum expansion tubes respectively. In addition, the sliding guidance of the convex edge welding ring material and the through groove facilitates the positioning of the stainless steel pipe and the copper expansion tube. The thick ring of the material pocket is used to cover and block the outside of the multiple through grooves. Thus, when the stainless steel pipe and the copper expansion tube are heated and welded, the convex edge welding ring material and the welding ring material are evenly fused into the copper expansion tube and the inside of the multiple through grooves. When the stainless steel pipe and the aluminum expansion tube are heated and welded, the sealing of the conical sealing ring and the bearing blocking ring facilitates the fusion of multiple welding columns between the stainless steel pipe and the aluminum expansion tube, increasing the bonding area, thereby effectively improving the overall welding strength and quality. Attached Figure Description

[0015] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the overall structure of the stainless steel pipe welding connection structure provided by this utility model;

[0017] Figure 2 A schematic diagram of the stainless steel pipe body at both ends of the stainless steel pipe welded connection structure provided by this utility model;

[0018] Figure 3 A schematic diagram of the stainless steel pipe body and the copper expansion tube in the stainless steel pipe welding connection structure provided by this utility model.

[0019] Figure 4 A schematic diagram of the stainless steel pipe body and the aluminum expansion tube in the stainless steel pipe welding connection structure provided by this utility model.

[0020] The markings in the diagram are explained as follows:

[0021] 1. Stainless steel tube body; 2. Copper tube body; 3. Aluminum tube body; 4. Copper expanded tube; 5. Aluminum expanded tube; 6. Through groove; 7. Supporting outer ring; 8. Material-holding thick ring; 9. Convex edge welding ring material; 10. Welding ring material preparation; 11. Thermal insulation ring; 12. Conical sealing ring; 13. Load-bearing plugging ring; 14. Welding column. Detailed Implementation

[0022] As described in the background section, when stainless steel pipes are directly welded to aluminum or copper pipes at both ends, the small joint area between the two leads to low welding strength.

[0023] To solve this technical problem, this utility model provides a stainless steel pipe welding connection structure, which is applied to the welding connection of stainless steel pipes with aluminum and copper pipes.

[0024] The system includes a stainless steel tube 1, with a copper tube 2 and an aluminum tube 3 at each end. A copper expansion tube 4 is fixed to the end of the copper tube 2 closest to the stainless steel tube 1, and an aluminum expansion tube 5 is fixed to the end of the aluminum tube 3 closest to the stainless steel tube 1. Multiple through grooves 6 are arranged in an array inside the end of the copper expansion tube 4 away from the copper tube 2. An outer ring 7 is fixed to the outer side of the stainless steel tube 1 closest to the copper tube 2. A convex edge welding ring 9 is fixed to the outer side of the outer ring 7 closest to the copper tube 2 and located outside the stainless steel tube 1. The outer side of the convex edge welding ring 9 is slidably connected to the multiple through grooves 6. A conical sealing ring 12 is fixed to the outer side of the stainless steel tube 1 closest to the aluminum tube 3. Multiple solder columns 14 are inserted in an array inside the conical sealing ring 12.

[0025] The stainless steel pipe welding connection structure provided by this utility model, through the flaring design of the copper expansion tube 4 and the aluminum expansion tube 5, makes it easy for both ends of the stainless steel pipe body 1 to be inserted into the inner side of the copper expansion tube 4 and the aluminum expansion tube 5 respectively. In addition, with the sliding guidance of the convex edge welding ring material 9 and the through groove 6, it is easy to position the insertion of the stainless steel pipe body 1 and the copper expansion tube 4. Thus, when the stainless steel pipe body 1 and the copper expansion tube 4 are heated and welded, the convex edge welding ring material 9 is easily fused and welded into the inner side of the copper expansion tube 4 and the inner side of the multiple through grooves 6. When the stainless steel pipe body 1 and the aluminum expansion tube 5 are heated and welded, multiple welding columns 14 are easily fused and welded between the stainless steel pipe body 1 and the aluminum expansion tube 5 to increase the bonding area, thereby effectively improving the overall welding strength and quality.

[0026] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] Example 1:

[0029] Please refer to Figure 1-4 A stainless steel pipe welding connection structure includes a stainless steel pipe body 1, with a copper pipe body 2 and an aluminum pipe body 3 respectively provided at both ends of the stainless steel pipe body 1. In order to facilitate the insertion and sleeve connection of both ends of the stainless steel pipe body 1 with the copper pipe body 2 and the aluminum pipe body 3 respectively, thereby facilitating subsequent welding, a copper expansion tube 4 is fixed at one end of the copper pipe body 2 near the stainless steel pipe body 1, and an aluminum expansion tube 5 is fixed at one end of the aluminum pipe body 3 near the stainless steel pipe body 1. The flared design of the copper expansion tube 4 and the aluminum expansion tube 5 makes it easy for both ends of the stainless steel pipe body 1 to be inserted into the inside of the copper expansion tube 4 and the aluminum expansion tube 5 respectively.

[0030] When the stainless steel tube 1 is inserted into the inside of the copper expansion tube 4, in order to facilitate the positioning and overlapping of the stainless steel tube 1, the copper expansion tube 4 has multiple through grooves 6 arranged in an array at the end away from the copper tube 2. The outer side of the stainless steel tube 1 near the copper tube 2 is fixed with an outer ring 7. The outer ring 7 near the copper tube 2 and located on the outer side of the stainless steel tube 1 is fixed with a convex edge welding ring 9. The outer side of the convex edge welding ring 9 is slidably connected to the multiple through grooves 6. The sliding guidance of the convex edge welding ring 9 and the through grooves 6 facilitates the positioning of the insertion of the stainless steel tube 1 and the copper expansion tube 4. The end of the outer ring 7 near the copper tube 2 is attached to the end of the copper expansion tube 4 away from the copper tube 2, which facilitates the sealing of the end of the multiple through grooves 6 near the stainless steel tube 1.

[0031] In order to further cover and block the outside of the multiple through grooves 6, a material-holding thick ring 8 is fixed on the outside of the outer ring 7. The end of the material-holding thick ring 8 away from the outer ring 7 extends to the outside of the multiple through grooves 6. The inner side of the material-holding thick ring 8 is in contact with the outside of the copper expansion tube 4. Thus, when the stainless steel tube 1 and the copper expansion tube 4 are heated and welded, the convex edge welding ring material 9 can be uniformly melted and filled between the stainless steel tube 1 and the copper expansion tube 4. Since the depth of the through groove 6 is greater than the thickness of the convex edge welding ring material 9, in order to ensure that the stainless steel tube 1 and the copper expansion tube 4 and the inner side of the multiple through grooves 6 can be uniformly filled with welding material during the heating and welding process, thereby increasing the welding bonding area, a welding ring preparation material 10 is set at the end of the convex edge welding ring material 9 away from the outer ring 7 and located on the outside of the stainless steel tube 1. The welding ring preparation material 10 is fixed to the stainless steel tube 1, and the outer side of the welding ring preparation material 10 is in contact with the inner side of the copper expansion tube 4.

[0032] When the stainless steel tube 1 is inserted into the inner side of the aluminum expansion tube 5, in order to facilitate the increase of the welding joint area between the stainless steel tube 1 and the aluminum expansion tube 5, a conical sealing ring 12 is fixed on the outer side of the stainless steel tube 1 near the aluminum tube 3. The end of the conical sealing ring 12 away from the stainless steel tube 1 is in contact with the end of the aluminum expansion tube 5 away from the aluminum tube 3. Multiple solder columns 14 are arranged in an array inside the conical sealing ring 12. A bearing plug ring 13 is fixed on the outer side of the stainless steel tube 1 near the aluminum tube 3. The ends of the multiple solder columns 14 away from the conical sealing ring 12 are all in contact with the bearing plug ring 13. The outer side of the bearing plug ring 13 is in contact with the inner side of the aluminum expansion tube 5. This allows the multiple solder columns 14 to be fused together between the stainless steel tube 1 and the aluminum expansion tube 5 when the stainless steel tube 1 and the aluminum expansion tube 5 are heated and welded, effectively increasing the welding joint area and thus improving the welding strength.

[0033] Example 2:

[0034] The stainless steel pipe welded connection structure provided in Example 1 is further optimized, specifically, as follows: Figure 4As shown, during the fusion welding process of multiple solder columns 14, the portion of the multiple solder columns 14 that is away from the bearing blocking ring 13 and extends to the outside of the conical sealing ring 12 will flow outward through the guide of the conical sealing ring 12. In order to further seal the outside of the conical sealing ring 12, a heat insulation baffle ring 11 is fixed on the outside of the aluminum expansion tube 5 near the stainless steel tube body 1. The outside of the conical sealing ring 12 is in contact with the inside of the heat insulation baffle ring 11, so that the extended portion of the multiple solder columns 14 accumulates between the heat insulation baffle ring 11 and the outside of the conical sealing ring 12 during fusion welding, and the heat insulation baffle ring 11 and the conical sealing ring 12 are fixed after cooling, thereby further improving the welding strength between the stainless steel tube body 1 and the aluminum expansion tube 5.

Claims

1. A stainless steel pipe welded connection structure, comprising a stainless steel pipe body (1), wherein a copper pipe body (2) and an aluminum pipe body (3) are respectively provided at both ends of the stainless steel pipe body (1), characterized in that, The copper tube (2) is fixed with a copper expansion tube (4) at one end near the stainless steel tube (1), and the aluminum tube (3) is fixed with an aluminum expansion tube (5) at one end near the stainless steel tube (1). The copper expansion tube (4) has multiple through grooves (6) arranged in an array at the end away from the copper tube (2). The stainless steel tube (1) is fixed with an outer ring (7) at the outer side near the copper tube (2). The outer ring (7) is fixed with a convex edge welding ring material (9) at the end near the copper tube (2) and located on the outer side of the stainless steel tube (1). The outer side of the convex edge welding ring material (9) is slidably connected to the multiple through grooves (6). The stainless steel tube (1) is fixed with a conical sealing ring (12) at the outer side near the aluminum tube (3). Multiple solder columns (14) are inserted in an array inside the conical sealing ring (12).

2. The stainless steel pipe welded connection structure according to claim 1, characterized in that, A material-holding thick ring (8) is fixed to the outside of the mounting outer ring (7), and the end of the material-holding thick ring (8) away from the mounting outer ring (7) extends to the outside of multiple through grooves (6).

3. The stainless steel pipe welded connection structure according to claim 2, characterized in that, The convex edge welding ring material (9) is located at the end away from the outer ring (7) and on the outside of the stainless steel tube body (1), where the welding ring material (10) is fixed to the stainless steel tube body (1). The outside of the welding ring material (10) is in contact with the inside of the copper expansion tube (4), and the inside of the material-filled thick ring (8) is in contact with the outside of the copper expansion tube (4).

4. The stainless steel pipe welded connection structure according to claim 1, characterized in that, A heat insulation ring (11) is fixed on the outer side of the aluminum expansion tube (5) near the stainless steel tube body (1). The outer side of the conical sealing ring (12) is in contact with the inner side of the heat insulation ring (11). A load-bearing plug ring (13) is fixed on the outer side of the stainless steel tube body (1) near the aluminum tube body (3). The ends of the multiple solder columns (14) away from the conical sealing ring (12) are all in contact with the load-bearing plug ring (13).

5. The stainless steel pipe welded connection structure according to claim 4, characterized in that, The outer side of the bearing plug ring (13) is in contact with the inner side of the aluminum expansion tube (5).

6. The stainless steel pipe welded connection structure according to claim 1, characterized in that, The end of the outer ring (7) near the copper tube body (2) is attached to the end of the copper expansion tube (4) away from the copper tube body (2), and the end of the conical sealing ring (12) away from the stainless steel tube body (1) is attached to the end of the aluminum expansion tube (5) away from the aluminum tube body (3).

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