CN215410741U

CN215410741U - Pipe fitting

Info

Publication number: CN215410741U
Application number: CN202022559969.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Xinchang County Sitong Electrical Co ltd
Current assignee: Xinchang County Sitong Electrical Co ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2022-01-04
Anticipated expiration: 2030-11-06

Abstract

The utility model discloses a pipe fitting, which is provided with a concave-convex part on the outer wall part, wherein the concave-convex part has a certain distance from one end of the pipe fitting, the concave-convex part has a certain distance from the other end of the pipe fitting, and the concave-convex part comprises a plurality of strip-shaped concave parts extending in the axial direction. Therefore, the pipe fitting is convenient to assemble and weld with pipelines made of other materials.

Description

Pipe fitting

[ technical field ] A method for producing a semiconductor device

The utility model relates to the field of pipeline connection, in particular to a pipe fitting.

[ background of the utility model ]

Some systems need to use a pipe fitting with the middle part matched with other pipelines, and because the matched part is not at the end part, the processing of the matched part which is not at the end part is relatively convenient without the processing of the end part.

[ Utility model ] content

In order to provide a new pipe fitting, which is more convenient to match with other pipelines and is easy to assemble and match for welding, the utility model provides the following technical scheme:

a pipe fitting provided with a concavo-convex portion at an outer wall portion at a certain distance from one end thereof and at a certain distance from the other end thereof, the concavo-convex portion comprising a plurality of strip-shaped concave portions extending in an axial direction, the strip-shaped concave portions being distributed along a circumferential direction of the pipe fitting.

One end of the pipe may include an end cap, a wall portion of the pipe between the concave-convex portion and the end cap is further provided with a hole, the pipe may be made of copper, and the strip-shaped recesses are substantially uniformly distributed along a circumferential direction of the pipe.

The tube may be provided with a recess at a distance of between 5mm and 15mm from one end of the tube.

The maximum part of the concave-convex part is 0.03-0.15mm larger than the straight pipe part beside the concave-convex part of the pipe fitting, and the deepest part of the strip-shaped concave part is 0.04-0.15mm lower than the surface of the pipe fitting; the length of the concave-convex part is between 5mm and 15 mm. The deepest part of the strip-shaped concave part can be recessed 0.05-0.12mm lower than the surface of the pipe fitting.

The pipe member may include two sets of concavo-convex portions that overlap, a maximum outer diameter of an overlapping portion of the two sets of concavo-convex portions being greater than or equal to a maximum outer diameter of a non-overlapping portion of the concavo-convex portions.

Set up concave-convex part at pipe fitting outer wall portion like this, can make things convenient for pipe fitting and other pipeline equipment and cooperation welding, make things convenient for the fixed of both after assembling.

Drawings

FIG. 1 is a schematic view of one embodiment of a pipe fitting connection arrangement provided by the present invention;

FIG. 2 is a schematic cross-sectional view of the tubular connection apparatus of FIG. 1;

FIG. 3 is a schematic view, partly in section, of the tubular connection apparatus of FIG. 1;

FIG. 4 is an enlarged partial schematic view of FIG. 3;

FIG. 5 is a schematic view of the fitting connection in another orientation;

FIG. 6 is a cross-sectional view of a second embodiment of a tubular connection apparatus;

FIG. 7 is a perspective view of a third embodiment of a tubular connection apparatus;

FIG. 8 is a schematic view, partly in section, of the tubular connection apparatus of FIG. 7;

FIG. 9 is an enlarged, fragmentary view of the tubular connection apparatus of FIG. 8;

FIG. 10 is a cross-sectional schematic view of the tubular connection apparatus of FIG. 7;

FIG. 11 is a partial schematic view of one embodiment of a nozzle;

FIG. 12 is a schematic view of an embodiment of a first submersible pipe;

FIG. 13 is a schematic view of an embodiment of a second submersible pipe;

FIG. 14 is a partial schematic view of the second submerged pipe during machining.

In the figure:

10 connecting pipe, 11 concave-convex part and 12 concave part

2 main tube, 20 main body part, 21 first necking part, 22 first matching part, 221 first step part, 23 flanging part, 24 main tube cavity, 25 second matching part, 251 second step part, 26 second necking part,

30 first immersed tube, 31 concavo-convex part, 32 concave part, 33 holes, 34 first immersed tube cavity, 35 end cover

40 adaptor, 41 limiting part, 42 tubular part,

50. 50a second down tube, hole 51, concavo-convex part 52, concave part 53, 54 connecting tube cavity, 55 end cover.

61 jig, 62 stand, 63 straight hob, 66 workpiece

Detailed Description

Referring to fig. 1 to 5, fig. 1 is a schematic view of an embodiment of a pipe connection device provided in the present invention, fig. 2 is a schematic cross-sectional view of the pipe connection device shown in fig. 1, fig. 3 is a schematic partial cross-sectional view of the pipe connection device shown in fig. 1, fig. 4 is an enlarged partial view of fig. 3, and fig. 5 is a schematic view of the pipe connection device in another direction.

As shown, the tubular connection device includes a main pipe 2, a nipple 10, a first submersible pipe 30, an adaptor 40, and a second submersible pipe 50. The main pipe 2 is made of stainless steel materials, and the connecting pipe 10, the first submerged pipe 30, the adapter 40 and the second submerged pipe 50 are made of copper pipes or copper materials.

The main pipe 2 comprises a main body part 20, a first necking part 21, a first matching part 22, a flanging part 23, a second matching part 25 and a second necking part 26, wherein the flanging part 23 is formed by flanging from the main body part 20 and can be flanged outwards or flanged inwards as shown in the figure; the first matching part 22 and the second matching part 25 are used for being matched and welded with a connecting pipe or an adapter and the like and are formed by necking, a second necking part 26 is arranged between the body part 20 and the first matching part 22, a first necking part 21 is arranged between the body part 20 and the second matching part 25, the first necking part 21 and the second necking part 26 are actually two transition sections formed or needed from the body part to the matching part, the transition sections are gradually reduced from the body part to the matching part, and the matching part can be formed by rolling a stainless steel pipe. The first fitting portion 22 is provided with a first step portion 221, and the second fitting portion 25 is provided with a second step portion 251. The first step portion 221 and the second step portion 251 can be used for positioning during assembly, for example, a welding ring can be placed in before the adapter tube is assembled, and then the adapter tube is placed in, and the welding ring is respectively abutted to the corresponding step portion and the adapter tube, for example, one side of the first matching portion, the inner side of one welding ring is abutted to the first step portion, and the other side is abutted to one end of the adapter tube 10. The first submerged pipe 30 has a structure with one end closed, specifically, one end located in the main pipe body is relatively closed, and one end of the first submerged pipe 30 located in the main pipe body has an end cap 35. The first submerged pipe 30 is provided with a concave part 32 at a position relatively close to the port on the outer side, the concave part 32 has a certain distance with the port part on the outer side of the first submerged pipe, the concave part 32 is used for matching and positioning with an external connecting pipe, the connecting pipe connected with the first submerged pipe 30 is in a structure positioned on the inner side of the concave part, and in addition, if the external connecting pipe connected with the concave part is sleeved on the outer side of the concave part, the convex structure can be changed. The first submerged pipe 30 has a certain length in the main pipe body, at least one hole 33 is provided in the pipe wall in the main pipe body, and the hole 33 communicates the first submerged pipe cavity 34 of the first submerged pipe 30 with the main pipe cavity 24 near the first submerged pipe. The end cap of the first submerged tube is not necessarily integral with the joint pipe body as shown in the figure, and may be integrally fixed to the joint pipe body by welding. The first submerged pipe 30 has a concave-convex portion at the portion corresponding to the flanged portion 23 of the main pipe and welded in a matching manner, so that the first submerged pipe 30 and the flanged portion 23 of the main pipe are partially in interference, and thus the first submerged pipe 30 and the flanged portion 23 of the main pipe can be relatively fixed without falling off after being assembled, and the limit is not required to be limited by other tools. The concave-convex part can be processed into a concave part in an axial direction extrusion mode, for example, a plurality of strip-shaped concave parts are formed at the end part of the concave-convex part through extrusion, an extrusion die can be provided with a convex part, the copper pipe can form the strip-shaped concave parts due to stress during extrusion, the two sides of the concave parts can be slightly in a convex state, if the connecting pipe is 10mm, the deepest part of the strip-shaped concave parts can be recessed by about 0.04-0.15mm (single side) below the surface of the copper pipe, but the concave parts are close to the original copper pipe and slightly protrude above the surface of the copper pipe, for example, the highest part protrudes by 0.02-0.05 mm (single side). Alternatively, the projections may be formed, for example, by extrusion dies having recesses into which the copper tube is forced during extrusion, such that the projections are relatively high

The adaptor 40 includes a limiting portion 41 and a tubular portion 42, and an outer wall portion of the tubular portion 42 may have a concave-convex portion, so that the outer wall of the tubular portion 42 and the second fitting portion 25 are relatively tightly fitted, and the two portions can be relatively fixed and cannot fall off after being assembled. The limiting portion 41 is formed by flanging from the tubular portion, so that the adaptor 40 and the main pipe can be axially limited, and the second matching portion 25 of the main pipe and the adaptor can be sealed and fixed by welding materials after welding.

In the present embodiment, the end of the second submerged pipe 50 located in the main pipe cavity is a closed structure, and the end of the second submerged pipe 50 located in the main pipe cavity is provided with an end cover 55. The second submerged pipe 50 is provided with a concave part 53 at a port position relatively close to the outer side, the concave part 53 has a certain distance from the outer side end part of the second submerged pipe 50, the concave part 53 is used for matching and positioning with an outer connecting pipe, and the concave part 53 is suitable for the condition that the connecting pipe connected with the second submerged pipe 50 is positioned at the inner side of the connecting pipe, and in addition, if the connecting pipe connected with the second submerged pipe 50 of the system is sleeved at the outer side of the connecting pipe, the convex structure can be changed. The second submersible pipe 50 has a longer length at the portion located in the main lumen and even extends partially to the corresponding axial position of the body portion. The second submerged pipe 50 is provided with a plurality of holes 51 on the pipe wall of the portion located in the main pipe cavity, and the holes 51 communicate the second submerged pipe cavity 54 of the second submerged pipe 50 with the outside of the second submerged pipe 50, or with the portion of the main pipe cavity 24 close to the second submerged pipe. The end cap of the second submerged tube 50 is not necessarily integral with the joint pipe body as shown in the figure, and may be integrally fixed to the joint pipe body by welding. In this embodiment, second submersible pipe 50 is welded to adapter 40.

Defining one side of the main pipe 2, on which the connecting pipe 10 is arranged, as a first end, and defining the other end of the main pipe as a second end; the first submerged pipe 30 is arranged relatively close to the second end of the main pipe than the first end of the main pipe, namely the first submerged pipe 30 is arranged relatively close to one side of the main pipe for arranging the second submerged pipe 50, or is arranged at the center of the main pipe and is deviated from the second end; the second submersible pipe 50 extends into the main pipe cavity 24 to a depth that exceeds the axial position of the main pipe at which the turn-up 23 is located, or the axial position of the end cap of the first submersible pipe 30 is located within the axial length of the second submersible pipe within the body portion. In a specific embodiment, the distance L2 between the middle position of the end cap of the first submersible pipe 30 and the end cap of the second submersible pipe is greater than or equal to the distance L1 between the middle position of the end cap of the first submersible pipe 30 and the second end of the main pipe in the axial direction of the main pipe; the distance L between the end cover of the second submerged pipe and the second end of the main pipe is more than or equal to one third of the length L0 of the main pipe, and the distance L between the end cover of the second submerged pipe and the second end of the main pipe is less than or equal to one half of the length L0 of the main pipe. The end cap of first submersible pipe 30 is not in direct contact with or is spaced from the second submersible pipe. In the axial direction of the main pipe, the second submerged pipe is provided with a hole 51 in the end cap of the first submerged pipe in the direction of the second end of the main pipe, and the second submerged pipe is also provided with a hole 51 in the end cap of the first submerged pipe in the direction of the first end of the main pipe. In one embodiment, the holes are distributed substantially uniformly in groups along the circumference of the second submerged pipe, each group having 3 or 4 holes along the circumference, and there are multiple groups, such as 4 or 5 groups, along the length of the second submerged pipe. The second submerged pipe in this embodiment has a bent portion, and the first submerged pipe also has a bent portion, and may be a straight pipe.

The main pipe 2, the connecting pipe 10, the first submerged pipe 30 and the adapter 40 can be welded in one step, such as protective welding in a tunnel furnace or protective welding in an oven or vacuum welding, and the protective welding can be inert gas protection or reducing gas protection; and then welding the welded assembly with a second submerged pipe. Protective welding via a tunnel furnace or protective welding or vacuum welding via an oven forms the pipe connection shown in fig. 6, with which the second submerged pipe can be welded in the end use. Alternatively, the second submerged pipe may be welded to the adapter 40 first, and then welded to the main pipe 2, the adapter pipe 10, and the first submerged pipe 30 by a tunnel furnace or by an oven. The main pipe 2, the adapter pipe 10, the first submersible pipe 30, the adapter 40, and the second submersible pipe 50 may be welded after being assembled at one time, and may be also welded by a tunnel furnace or an oven or vacuum welded.

Another embodiment is described below, as shown in fig. 7-10. Fig. 7 is a perspective view illustrating a third embodiment of a pipe coupling device, fig. 8 is a partial sectional view illustrating the pipe coupling device shown in fig. 7, fig. 9 is a partial enlarged view illustrating the pipe coupling device shown in fig. 8, and fig. 10 is a sectional view illustrating the pipe coupling device shown in fig. 7. As shown, the pipe connection device includes a main pipe 2, a nipple 10, a first submersible pipe 30, and a second submersible pipe 50 a. The main pipe 2 is made of stainless steel, the connecting pipe 10 is made of a copper pipe, and the first submerged pipe 30 and the second submerged pipe 50a are made of copper pipes or copper materials.

The main pipe 2 comprises a main body part 20, a first necking part 21, a first matching part 22, a flanging part 23, a second matching part 25a and a second necking part 26, wherein the flanging part 23 is formed by flanging from the main body part 20 and can be flanged outwards or flanged inwards as shown in the figure; the first matching part 22 and the second matching part 25a are used for being matched and welded with the connecting pipe and are formed by necking, a second necking part 26 is arranged between the body part 20 and the first matching part 22, a first necking part 21 is arranged between the body part 20 and the second matching part 25a, the first necking part 21 and the second necking part 26 are actually two transition sections from the body part to the matching part, the transition sections are gradually reduced from the body part to the matching part, and the matching part can be formed by rolling and pressing a stainless steel pipe. The first fitting portion 22 may be similarly provided with the first step portion 221. The first step portion 221 is used for positioning during assembly, for example, a welding ring can be placed in before the adapter tube is assembled, and then the adapter tube is placed in, and the welding ring is respectively abutted to the corresponding step portion and the adapter tube or the adapter piece, for example, one side of the first matching portion, the inner side of one welding ring is abutted to the first step portion, and the other side is abutted to one end of the adapter tube 10. The first submerged pipe 30 has a structure in which one end is relatively closed, specifically, one end located in the main pipe body is closed, and the end of the first submerged pipe 30 located in the main pipe body has an end cap 35. The first submerged pipe 30 is provided with a concave part 32 at a position relatively close to the port on the outer side, the concave part 32 has a certain distance with the port part on the outer side of the first submerged pipe, the concave part 32 is used for matching and positioning with an external connecting pipe, the connecting pipe connected with the first submerged pipe 30 is in a structure positioned on the inner side of the concave part, and in addition, if the external connecting pipe connected with the concave part is sleeved on the outer side of the concave part, the convex structure can be changed. The first submerged pipe 30 has a certain length in the main pipe body, at least one hole 33 is provided in the pipe wall in the main pipe body, and the hole 33 communicates the first submerged pipe cavity 34 of the first submerged pipe 30 with the main pipe cavity 24 near the first submerged pipe. The end cap of the first submerged tube is not necessarily integral with the joint pipe body as shown in the figure, and may be integrally fixed to the joint pipe body by welding. The first submerged pipe 30 has a concave-convex portion at the portion corresponding to the flanged portion 23 of the main pipe and welded in a matching manner, so that the first submerged pipe 30 and the flanged portion 23 of the main pipe are partially in interference, and thus the first submerged pipe 30 and the flanged portion 23 of the main pipe can be relatively fixed without falling off after being assembled, and the limit is not required to be limited by other tools.

One end of the second submerged pipe 50a in the main pipe cavity is of a closed structure, and one end of the second submerged pipe 50a in the main pipe cavity is provided with an end cover 55. The second submerged pipe 50a is provided with a concave part 53 at the port part relatively close to the outer side, the concave part 53 has a certain distance, such as 5-15mm, with the port part at the outer side of the second submerged pipe, the concave part 53 is used for the matching and positioning of the external connecting pipe, which is suitable for the condition that the connecting pipe connected with the second submerged pipe 50a is positioned at the inner side, and in addition, if the connecting pipe connected with the second submerged pipe 50a is sleeved at the outer side, the convex structure can be changed. The portion of the second submerged pipe 50a located in the main pipe cavity has a long length, and a plurality of holes 51 are provided in the pipe wall of the portion located in the main pipe cavity, and the holes 51 communicate the second submerged pipe cavity 54 of the second submerged pipe 50a with the outside of the second submerged pipe 50a, or with a portion of the main pipe cavity 24 close to the second submerged pipe. The end cap of the second submerged tube 50a is not necessarily integral with the joint pipe body as shown in the figure, and may be integrally fixed by welding to the joint pipe body. The second submerged pipe 50a is provided with a concave-convex part 52, the position of the concave-convex part 52 corresponds to the position of the second matching part 25 of the main pipe, and the concave-convex part 52 enables the second submerged pipe 50a and the second matching part 25 to be partially interfered, so that the assembly is convenient, the welding is suitable for being carried out after the assembly, and the limitation by other tools is not needed. The concave-convex part can be processed by adopting a concave part processing mode, a plurality of strip concave parts are formed on the outer wall part of the concave-convex part through extrusion, for example, a straight hob extrusion mode is adopted, or an extrusion tool is respectively extruded from two sides, the extruded tool is provided with a convex part, because of the stress during extrusion, the surface of the copper pipe can form the strip concave parts, and the two sides of the strip concave parts can be slightly in a convex state, so that the maximum part of the formed concave-convex part is 0.03-0.15mm (diameter) larger than the straight pipe part of the pipe fitting before processing, the deepest part of the strip concave part is recessed 0.04-0.15mm (single side) below the surface of the pipe fitting, and further, the deepest part of the strip concave part can be controlled to be recessed 0.05-0.12mm below the surface of the pipe fitting; in addition, the extruded tool can also be provided with a concave part, and the concave-convex part formed in such a way can be slightly different.

Defining one side of the main pipe 2, on which the connecting pipe 10 is arranged, as a first end, and defining the other end of the main pipe as a second end; the first submerged pipe 30 is relatively close to the second end of the main pipe than the first end of the main pipe, that is, the first submerged pipe 30 is relatively close to the side of the main pipe where the second submerged pipe 50a is arranged, or is arranged at the center of the main pipe and is offset to the second end; the second submerged tube 50a extends into the main tube cavity 24 to a depth exceeding the axial position of the main tube at which the burring 23 is provided, or the axial position of the end cap of the first submerged tube 30 is located within the axial length of the second submerged tube in the main tube cavity. In a specific embodiment, the distance L2 between the middle position of the end cap of the first submersible pipe 30 and the end cap of the second submersible pipe is greater than or equal to the distance L1 between the middle position of the end cap of the first submersible pipe 30 and the second end of the main pipe in the axial direction of the main pipe; the distance L between the end cover of the second submerged pipe and the second end of the main pipe is more than or equal to one third of the length L0 of the main pipe, and the distance L between the end cover of the second submerged pipe and the second end of the main pipe is less than or equal to one half of the length L0 of the main pipe. The end cap of first submersible pipe 30 is not in direct contact with or is spaced from the second submersible pipe. In the axial direction of the main pipe, the second submerged pipe is provided with a hole 51 in the end cap of the first submerged pipe in the direction of the second end of the main pipe, and the second submerged pipe is also provided with a hole 51 in the end cap of the first submerged pipe in the direction of the first end of the main pipe. In one embodiment, the holes are distributed substantially uniformly in groups along the circumference of the second submerged pipe, each group having 3 or 4 holes along the circumference, and there are multiple groups, such as 4 or 5 groups, along the length of the second submerged pipe. The second submerged pipe in this embodiment has a bent portion, and the first submerged pipe also has a bent portion.

The pipe connection device can be welded at one time, such as assembling the main pipe 2, the adapter pipe 10, the first submerged pipe 30 and the second submerged pipe 50a, and performing protective welding through a tunnel furnace or performing protective welding through an oven or performing vacuum welding. Specifically, the manufacturing process is described by taking this embodiment as an example, and the manufacturing process may include the following steps:

processing parts: comprises a processing main pipe, a connecting pipe and two submerged pipes;

the main pipe can roll one end firstly and then roll the other end to form two matching parts on two sides respectively, and a step part for positioning is formed by lathing. Forming a concave-convex portion at a fitting portion of one of the main pipe and the adapter pipe by means of pressing, hobbing, or the like, and forming a concave-convex portion at a fitting portion of one of the main pipe and the submerged pipe; the first connecting pipe can be formed into the concave-convex part 11 of the end part by extruding and the like at one end needing to be matched as shown in fig. 11, and other structures such as the positioning concave part 12 are processed at the same time, the concave-convex part 11 has a certain length to meet the requirement of welding and matching, such as 5-15mm, but the length can be lengthened, such as 20mm when the system has special requirements. The length of the first submerged pipe 30 extending into the main pipe cavity is not long, and the concave-convex portion 31 can be processed by adopting an extrusion method, as shown in fig. 12, the extrusion method is mainly relatively convenient to process and is suitable for the condition that the concave-convex portion is positioned at one end, and then a hole 33 or other structures required to extend into the wall of the main pipe cavity are processed, and a positioning concave portion 32 is processed. Alternatively, as shown in fig. 14, it is possible to adopt a method in which the concave-convex portion to be processed is not located at both ends of the pipe, that is, the concave-convex portion is located at a predetermined distance from the first end of the pipe, and the concave-convex portion is located at a predetermined distance from the second end of the pipe, so that the processing by the axial movement such as pressing cannot be performed. As shown, a workpiece to be machined, such as a pipe, is clamped in a rotatable apparatus or tool 61 so that the workpiece can rotate, a straight hob 63 can be mounted on a carriage 62 which can move back and forth, when the equipment or the tool 61 rotates, the workpiece is driven to rotate together, the straight-line hob 63 is abutted to the workpiece by the movable rack 62 for a set time, which is generally short and basically corresponds to the time for rotating the workpiece for one circle, thereby forming irregularities on the surface of the workpiece 66, which makes it possible to form the irregularities 52 of the second submersible pipe as shown in fig. 13, the irregularities 52 thus formed being mainly recessed from the surface of the copper pipe to form strip-like recesses, the two sides of the strip-shaped concave part form a slightly convex structure, the middle part of the strip-shaped concave part is relatively deep, the deepest part of the strip-shaped concave part is recessed 0.04-0.15mm below the surface of the pipe fitting, and further, the deepest part of the strip-shaped concave part can be controlled to be recessed 0.05-0.12mm below the surface of the pipe fitting; the depth can vary with the thickness of the pipe, etc.; other steps such as bending can be performed after the concave-convex part is processed; during assembly, the concave-convex part 52 and the matching part can form a local interference structure or transition fit, so that the concave-convex part and the matching part are easily fixed relatively after assembly, and the strip-shaped concave part structure is favorable for flowing of solder during welding, so that the welding quality is relatively reliable and stable.

Assembling: assembling the main pipe, the connecting pipe, the first submerged pipe and the second submerged pipe. The inner diameter of the first matching part of the main pipe can be slightly larger than the original outer diameter of the connecting pipe, for example, the inner diameter is larger than 0.03mm, and the main pipe and the connecting pipe are locally and tightly matched through the concave-convex parts at the matching parts of the main pipe and the connecting pipe; the corresponding matching parts of the submerged pipe and the main pipe are similar, and the main pipe and the first submerged pipe are partially tightly matched through the concave-convex parts of the main pipe and the first submerged pipe at the matching parts; the main pipe and the second submerged pipe are partially tightly matched through the concave-convex parts of the second submerged pipe by the concave-convex parts of the main pipe and the second submerged pipe at the matching part; in addition, the concave-convex part can be arranged at the corresponding part of the main pipe. In the assembling step, a bronze weld ring may be first placed on the first fitting portion of the main pipe, and the joint pipe may be assembled such that the bronze weld ring is positioned between the stepped portion of the first fitting portion and the joint pipe.

Welding: and performing protective welding on the assembled pipe fitting connecting device semi-finished product through furnace welding or a high-temperature oven, or performing welding fixation through a vacuum oven.

The main pipe, the connecting pipe and the two submerged pipes of the pipe fitting connecting device can be welded and fixed in a protective way at one time, so that the processing steps are relatively few; the welding material adopted when the main pipe and the connecting pipe are welded can adopt bronze welding material, and the bronze welding material also can be adopted when the main pipe and the submerged pipe are welded; the main pipe, the connecting pipe and the two submerged pipes are welded by a tunnel furnace or an oven, and inert gas protection or reducing gas protection is adopted in the tunnel furnace or the oven during welding; in addition, the welding can also be realized through a vacuum oven.

In addition, like the first embodiment, the main pipe, the connecting pipe, the adaptor and the first submersible pipe of the pipe connecting device can be fixed by welding at one time, and the above description can be referred to, and the description is omitted.

The second submerged pipe may be a pipe member as shown in fig. 13, the pipe member is provided with a concave-convex portion 52 on an outer wall portion thereof, the concave-convex portion 52 has a certain distance from one end of the pipe member, the concave-convex portion has a certain distance from the other end of the pipe member, and the distance is generally greater than 10mm, the concave-convex portion includes a plurality of strip-shaped concave portions extending in the axial direction, and the strip-shaped concave portions are approximately uniformly distributed along the circumferential direction of the pipe member, or the strip-shaped concave portions are uniformly distributed around the circumferential direction of the pipe member at positions of the concave-convex portion of the pipe member. If the required concave-convex parts are relatively long, two groups of concave-convex parts can be arranged at corresponding positions on the surface of the pipe fitting, each group of concave-convex parts is respectively provided with a plurality of strip-shaped concave parts, and the two groups of concave-convex parts are partially overlapped, for example, one end of the strip-shaped concave part of one group of concave-convex parts is positioned in the axial length range of the other group of concave-convex parts.

One of the ends of the tube may comprise an end cap 55, the wall of the tube between said relief 52 and the end cap 55 being further provided with a plurality of holes 51. The tube may be provided with a recess 53, the recess 53 being at a distance of between 5mm and 15mm from the closer end of the tube. The maximum part of the concave-convex part is 0.03-0.15mm larger than the straight pipe part beside the concave-convex part of the pipe fitting, and the length of the concave-convex part is 5-15 mm. When the length of the concave-convex part is about 5mm, one concave-convex part can be arranged, and when the length is about 10mm, two concave-convex parts can be arranged, and the maximum outer diameter of the overlapped part of the two concave-convex parts is larger than or equal to the maximum outer diameter of the non-overlapped part of the concave-convex parts, such as 0.03-0.05 mm.

While the pipe and pipe applications as a submersible have been described above with reference to specific embodiments, the pipe connection may be of different configurations, such as for different systems. And will not be described one by one here.

It should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A pipe fitting provided with a concavo-convex portion at an outer wall portion at a certain distance from one end thereof and at a certain distance from the other end thereof, the concavo-convex portion comprising a plurality of strip-shaped concave portions extending in an axial direction, the strip-shaped concave portions being distributed along a circumferential direction of the pipe fitting.

2. A pipe member according to claim 1, wherein the pipe member includes an end cap at one end thereof, a wall portion of the pipe member between the concavo-convex portion and the end cap is further provided with a hole, and the pipe member is made of copper; the strip-shaped concave parts are approximately uniformly distributed along the circumferential direction of the pipe fitting.

3. A tube according to claim 1 or 2, characterized in that the tube is provided with a recess at a distance of between 5mm and 15mm from one end of the tube.

4. A pipe member as claimed in claim 1 or 2, wherein the maximum portion of said concavo-convex portion is larger than the straight pipe portion of said pipe member where said concavo-convex portion is not provided by 0.03 to 0.15mm, and the deepest portion of said strip-like concave portion is recessed from the surface of said pipe member by 0.04 to 0.15 mm; the length of the concave-convex part is between 5mm and 15 mm.

5. A pipe member as claimed in claim 3, wherein the maximum portion of said concavo-convex portion is larger than the straight pipe portion of said pipe member where said concavo-convex portion is not provided by 0.03 to 0.15mm, and the deepest portion of said strip-like concave portion is recessed from the surface of said pipe member by 0.04 to 0.15 mm; the length of the concave-convex part is between 5mm and 15 mm.

6. A pipe member as claimed in any one of claims 1 to 2, wherein the maximum portion of said concavo-convex portion is larger than the straight pipe portion of said pipe member where said concavo-convex portion is not provided by 0.03 to 0.15mm, and the deepest portion of said strip-like concave portion is recessed from the surface of said pipe member by 0.05 to 0.12 mm; the length of the concave-convex part is between 5mm and 15 mm.

7. A pipe member as claimed in claim 3, wherein the maximum portion of said concavo-convex portion is larger than the straight pipe portion of said pipe member where said concavo-convex portion is not provided by 0.03 to 0.15mm, and the deepest portion of said strip-like concave portion is recessed from the surface of said pipe member by 0.05 to 0.12 mm; the length of the concave-convex part is between 5mm and 15 mm.

8. A pipe member according to any one of claims 1-2, wherein said pipe member comprises two sets of reliefs, said sets of reliefs overlapping, said set of reliefs overlapping having a maximum outer diameter greater than or equal to the maximum outer diameter of said reliefs non-overlapping.

9. A pipe member as claimed in claim 3, comprising two sets of reliefs which partially overlap, the maximum external diameter of the overlapping portion of the two sets being greater than or equal to the maximum external diameter of the non-overlapping portion of the reliefs.