CN218915476U - Pipeline device and air conditioner with same - Google Patents

Abstract

The utility model discloses a pipeline device and an air conditioner with the pipeline device. The pipeline device comprises: a first conduit assembly, the first conduit assembly comprising: the device comprises a first pipeline and a first connecting sleeve arranged at the end part of the first pipeline, wherein the material of the first pipeline comprises a first metal, and the material of the first connecting sleeve comprises a second metal; a second conduit assembly, the second conduit assembly comprising: the second pipeline and the second adapter sleeve that links to each other with the second pipeline, the material of second adapter sleeve includes the second metal, and the inner wall surface of second adapter sleeve includes: the first connecting sleeve at least partially stretches into the second connecting sleeve and is fixed with the welding matching surface, and the anti-dripping extending surface is arranged at one end of the welding matching surface far away from the first connecting sleeve. According to the pipeline device, excessive solder at the welding matching surface can drip onto the anti-dripping extending surface, and the anti-dripping extending surface can absorb the dripped solder to prevent the solder from dripping further onto the lower parts.

Description

Pipeline device and air conditioner with same

Technical Field

The utility model relates to the technical field of air conditioners, in particular to a pipeline device and an air conditioner with the pipeline device.

Background

In the related art, when two steel pipes are welded and fixed, after superfluous solder at a welding position drops on the inner wall of the steel pipe, the superfluous solder slides down like water drops, and the sliding solder enters parts such as a four-way valve and the like, so that the sliding parts in the four-way valve are easy to be blocked or abnormal sounds are easily caused.

Disclosure of Invention

The present utility model aims to solve, at least to some extent, one of the above technical problems in the prior art. Therefore, the utility model provides a pipeline device to prevent solder from sliding along the inner wall of the steel pipe.

The utility model also provides an air conditioner with the pipeline device.

The pipeline device according to the embodiment of the utility model comprises: a first conduit assembly, the first conduit assembly comprising: a first pipeline and a first connecting sleeve arranged at the end part of the first pipeline, wherein the material of the first pipeline comprises a first metal, and the material of the first connecting sleeve comprises a second metal; a second conduit assembly, the second conduit assembly comprising: the second pipeline and with the second adapter sleeve that the second pipeline links to each other, the material of second adapter sleeve includes the second metal, the inner wall surface of second adapter sleeve includes: the first connecting sleeve at least partially stretches into the second connecting sleeve and is fixed with the welding matching surface, and the anti-dripping extending surface is arranged at one end, far away from the first connecting sleeve, of the welding matching surface; wherein the thermal conductivity of the second metal is higher than the thermal conductivity of the first metal.

According to the pipeline device provided by the embodiment of the utility model, the welding matching surface of the second connecting sleeve is fixed with the first connecting sleeve, and the anti-dripping extension surface is arranged at one end of the welding matching surface far away from the first connecting sleeve, so that the excessive solder at the welding matching surface can be ensured to drip onto the anti-dripping extension surface, the anti-dripping extension surface can absorb the dripped solder, and the solder is prevented from dripping onto the lower part, so that the internal sliding part of the lower part is further prevented from being blocked or abnormal sound is further prevented.

According to some embodiments of the utility model, the anti-drip extension surface is equal to an inner diameter of the weld mating surface.

According to some embodiments of the utility model, the material of the second pipe comprises the second metal, and the second connecting sleeve is integrally formed at an end of the second pipe adjacent to the first pipe assembly.

Further, the pipe diameters of the second pipeline and the second connecting sleeve are different, the second pipeline and the second connecting sleeve are connected through a second transition section, and one end, far away from the welding matching surface, of the anti-dripping extension surface extends to the second transition section.

According to some embodiments of the utility model, the material of the second pipe comprises the first metal, and the second connecting sleeve is nested with the second pipe.

Specifically, the second pipeline includes: the second pipeline body and the second pipe diameter change portion that sets up the tip of second pipeline body, the pipe diameter of second pipe diameter change portion with the pipe diameter of second pipeline body is different, the second pipeline body with connect through the third changeover portion between the second pipe diameter change portion, the second adapter sleeve with the nested cooperation of second pipe diameter change portion and welded fastening, and antidrip extension face extends to third changeover portion department.

According to some embodiments of the utility model, the length of the anti-drip extension face is not less than the length of the weld mating face.

According to some embodiments of the utility model, the length of the anti-drip extension face is not less than 10mm.

According to some embodiments of the utility model, a first protrusion is further provided on the inner wall surface or the outer wall surface of the first connecting sleeve, and the first protrusion is positioned on the free end surface of the second connecting sleeve.

Optionally, the first protrusion is configured as a plurality of first protrusions arranged at intervals in the circumferential direction of the first connection sleeve; or the first convex portion is configured as a first annular projection continuous in the circumferential direction of the first coupling sleeve.

According to some embodiments of the utility model, a second protrusion is further provided on the inner wall surface or the outer wall surface of the second connecting sleeve, and the second protrusion is positioned on the free end surface of the first connecting sleeve.

Further, the second protrusion separates the welding mating surface and the drip-preventing extension surface in an axial direction of the line set.

Optionally, the second protruding portion is configured as a plurality of second protrusions arranged at intervals in a circumferential direction of the second connecting sleeve; or the second protruding portion is configured as a second annular protrusion continuous in the circumferential direction of the second connecting sleeve.

According to some embodiments of the utility model, the first conduit comprises: the pipe comprises a first pipeline body and a first pipe diameter changing part arranged at the end part of the first pipeline body, wherein the pipe diameter of the first pipe diameter changing part is different from that of the first pipeline body, and the first connecting sleeve is in nested fit with the first pipe diameter changing part and welded and fixed.

According to some embodiments of the utility model, the first pipe body and the first pipe diameter change are connected by a first transition section, which is offset from the welding interface in the axial direction of the pipe arrangement.

Optionally, the first transition section is at least 18mm from the welding interface.

According to some embodiments of the utility model, the end surface of the first pipe diameter changing portion is flush with the end surface of the first connection sleeve.

According to some embodiments of the utility model, the first connecting sleeve portion extends into the second connecting sleeve.

According to some embodiments of the utility model, the first metal is iron and/or the second metal is copper.

An air conditioner according to another embodiment of the present utility model includes the above-described piping device.

The air conditioner has the same advantages as the above-mentioned pipeline device compared with the prior art, and will not be described herein.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

FIG. 1 is a schematic cross-sectional view of a line set according to a first embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of a line set according to a second embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of a line set according to a third embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view of a line set according to a fourth embodiment of the present utility model;

FIG. 5 is a schematic cross-sectional view of a plumbing device in accordance with a fifth embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of a plumbing device in accordance with a sixth embodiment of the present utility model;

FIG. 7 is a schematic cross-sectional view of a line set according to a seventh embodiment of the present utility model;

FIG. 8 is a schematic cross-sectional view of a first conduit assembly according to one embodiment of the utility model;

FIG. 9 is a schematic cross-sectional view of a first conduit assembly according to another embodiment of the utility model;

FIG. 10 is a schematic cross-sectional view of a first coupling sleeve according to one embodiment of the present utility model;

FIG. 11 is a schematic cross-sectional view of a first coupling sleeve according to another embodiment of the present utility model;

FIG. 12 is a schematic cross-sectional view of a first coupling sleeve according to yet another embodiment of the present utility model;

fig. 13 is a front view of a first protrusion according to one embodiment of the present utility model;

fig. 14 is a front view of a first protrusion according to another embodiment of the present utility model;

FIG. 15 is a schematic cross-sectional view of a second conduit assembly according to a first embodiment of the utility model;

FIG. 16 is a schematic cross-sectional view of a second conduit assembly according to a second embodiment of the utility model;

FIG. 17 is a schematic cross-sectional view of a second conduit assembly according to a third embodiment of the utility model;

FIG. 18 is a schematic cross-sectional view of a second conduit assembly according to a fourth embodiment of the utility model;

FIG. 19 is a schematic cross-sectional view of a second conduit assembly according to a fifth embodiment of the utility model;

fig. 20 is a schematic cross-sectional view of a second conduit assembly according to a sixth embodiment of the utility model.

Reference numerals:

the first pipe assembly 10, the first pipe 1, the first pipe body 11, the first pipe diameter changing portion 12, the first transition piece 13, the first connection sleeve 2, the first convex portion 21, the fitting portion 22, the connection portion 23, the second pipe assembly 20, the second pipe 3, the second transition piece 31, the second pipe body 32, the second pipe diameter changing portion 33, the third transition piece 34, the second connection sleeve 4, the welding mating surface 41, the anti-drip extension surface 42, and the second convex portion 43.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "plurality" is at least two unless explicitly defined otherwise.

A line set in accordance with an embodiment of the present utility model is described in detail below in conjunction with fig. 1-20.

Referring to fig. 1-7, a line set according to an embodiment of the present utility model may include a first line assembly 10 and a second line assembly 20.

1-9, the first conduit assembly 10 may include: the first pipeline 1 and the first connecting sleeve 2 are connected, and optionally, the first connecting sleeve 2 and the first pipeline 1 can be fixedly connected in a welding mode. The first connection sleeve 2 is arranged at the end of the first pipeline 1, as in the embodiment shown in fig. 1-9, the first connection sleeve 2 being located at the lower end of the first pipeline 1.

In some embodiments, the material of the first conduit 1 comprises a first metal. In some embodiments, the first metal is iron. The present utility model is described taking the example that the first metal is iron, so that the main material of the first pipe 1 comprises iron, but may also comprise other materials, such as carbon, so that the first pipe 1 is a steel pipe, alternatively the first pipe 1 is a stainless steel pipe. Of course, in some embodiments, the first pipe 1 may also be a pure iron pipe.

Similarly, the material of the first coupling sleeve 2 comprises a second metal. In some embodiments, the second metal is copper. The present utility model is described using the second metal as copper, so that the main material of the first connecting sleeve 2 includes copper, and may also include other materials, and of course, the first connecting sleeve 2 may also be a pure copper sleeve, and for convenience of description, the first connecting sleeve 2 is collectively referred to as a copper sleeve.

In some alternative embodiments, the second metal may also be aluminum, which is not described herein.

Referring to fig. 1-7, and 15-20, the second conduit assembly 20 may include: the second pipeline 3 and the second connecting sleeve 4, the second connecting sleeve 4 is connected with the second pipeline 3. Alternatively, the second connecting sleeve 4 and the second pipeline 3 can be fixedly connected by welding. In alternative embodiments, the second connecting sleeve 4 and the second line 3 may also be formed integrally.

The second connection sleeve 4 is located at the end of the second pipe 3, for example in the embodiments shown in fig. 1-7 and 15-20, the second connection sleeve 4 is located at the upper end of the second pipe 3, i.e. the second connection sleeve 4 is located at the end of the second pipe 3 near the first connection sleeve 2, so that the second connection sleeve 4 is connected to the first connection sleeve 2.

The material of the second connection sleeve 4 comprises a second metal. When the second metal is copper, similarly, the main material of the second connecting sleeve 4 includes copper, but may also include other materials, and of course, the second connecting sleeve 4 may also be pure copper, and for convenience of description, the second connecting sleeve 4 is collectively referred to as a copper sleeve.

The thermal conductivity of the second metal is higher than the thermal conductivity of the first metal, such that the thermal conductivity of the second metal is higher than the thermal conductivity of the first metal. Taking iron as the first metal and copper as the second metal as examples, according to the material characteristics, the heat conductivity of copper is higher than that of steel, the heat conductivity of copper is good, the heat conductivity of steel is poor, after heating, the copper material is in a red-passing state (namely a high-temperature state) in the vicinity of a heating point, and the steel material is in a red-passing state only at the heating point, and the surrounding of the heating point still keeps the natural color. That is, the heat at the heating point of the copper material is easily diffused to the surroundings so that the surroundings are in a high temperature state, whereas the heat at the heating point of the steel material is difficult to be diffused to the surroundings, and the high temperature state is maintained only at the heating point.

Referring to fig. 1 to 7 and 15 to 20, the inner wall surface of the second connecting sleeve 4 includes: the anti-drip extension surface 42 and the welding surface 41, the first connecting sleeve 2 extends at least partially into the second connecting sleeve 4, and the first connecting sleeve 2 is fixed with the welding surface 41.

Specifically, the first coupling sleeve 2 is welded to the welding mating surface 41, and the drip-preventing extension surface 42 is provided at an end of the welding mating surface 41, which is remote from the first coupling sleeve 2. In the embodiments shown in fig. 1-7 and 15-20, the anti-dripping extension surface 42 is disposed at the lower end of the welding mating surface 41, and since the second connecting sleeve 4 is a copper sleeve, that is, the main materials of the welding mating surface 41 and the anti-dripping extension surface 42 both include copper (that is, the second metal), when the welding gun welds at the welding mating surface 41, the second connecting sleeve 4 is in a red-through state in the vicinity of the heating point, in other words, when the welding mating surface 41 of the first connecting sleeve 2 and the second connecting sleeve 4 welds, the welding heat generated not only causes the welding mating surface 41 to be in a red-through state, but also causes the anti-dripping extension surface 42 to be in a red-through state, and the excessive solder at the welding mating surface 41 can slide down to the anti-dripping extension surface 42, so that the high-temperature anti-dripping extension surface 42 can well absorb the dripped solder, and prevent the solder from further dripping onto the parts such as the four-way valve below, thereby further preventing the internal sliding parts such as the four-way valve from being blocked or producing abnormal sounds.

Compared with the technical scheme that the second connecting sleeve 4 of the pipeline device comprises two working areas of the anti-dripping extending surface 42 and the welding matching surface 41, the anti-dripping extending surface 42 can be guaranteed to absorb solder well by the arrangement of the anti-dripping extending surface 42, and therefore the solder is prevented from sliding onto the second pipeline 3.

Alternatively, the first connecting sleeve 2 and the welding mating surface 41 may be welded together by flame brazing.

According to the pipeline device provided by the embodiment of the utility model, the welding matching surface 41 of the second connecting sleeve 4 is welded and fixed with the first connecting sleeve 2, and the anti-dripping extension surface 42 is arranged at the lower end of the welding matching surface 41, so that the anti-dripping extension surface 42 is far away from the first connecting sleeve 2, the situation that excessive solder at the welding matching surface 41 can drip onto the anti-dripping extension surface 42 can be ensured, and the main material comprises the anti-dripping extension surface 42 of the second metal can absorb the dripped solder, so that the solder is prevented from dripping onto the lower part, and the internal sliding part of the lower part is further prevented from being blocked or abnormal sound is further prevented.

In some embodiments of the present utility model, the inner diameters of the anti-drip extension face 42 and the weld engagement face 41 are equal. This reduces the resistance to solder flow between the solder mating surface 41 and the anti-drip extension surface 42, facilitating the flow of excess solder onto the anti-drip extension surface 42 along the junction of the solder mating surface 41 and the anti-drip extension surface 42.

If the inner diameters of the anti-dripping extension surface 42 and the welding mating surface 41 are not equal, the anti-dripping extension surface 42 and the welding mating surface 41 are inevitably connected in a transitional manner through a transitional section, and the transitional section is generally formed through machining or other forming methods, so that the stress at the transitional section is concentrated, and the transitional section is easy to crack after being heated (such as being directly heated or subjected to heat radiation), and the inner diameters of the anti-dripping extension surface 42 and the welding mating surface 41 are designed to be equal, so that the anti-dripping extension surface 42 and the welding mating surface 41 are located on the same annular surface, and the stress concentration phenomenon at the joint of the anti-dripping extension surface 42 and the welding mating surface 41 is reduced, so that the strength and the rigidity of the second connecting sleeve 4 are better.

In the present utility model, the expressions "inner diameter is equal", "inner diameter is the same", and the like include the case of being completely equal or approximately equal, which is clearly different from the case of a change in inner diameter having a mutation. That is, it is within the scope of the present utility model that the inner diameters be exactly or approximately equal.

In some embodiments of the utility model, the mating diameter of the first conduit 1 is d1 and the mating diameter of the first coupling sleeve 2 is d2, d1=d2. When the first connecting sleeve 2 is sleeved outside the first pipeline 1, referring to fig. 8, d1 is the outer diameter of the matching part of the first pipeline 1, and d2 is the inner diameter of the matching part of the first connecting sleeve 2; when the first connection sleeve 2 is sleeved inside the first pipeline 1, as shown in fig. 9, d1 is an inner diameter of a matching portion of the first pipeline 1, and d2 is an outer diameter of the matching portion of the first connection sleeve 2.

As shown in connection with fig. 8-14, the first connecting sleeve 2 may comprise a mating part 22 for mating with the first pipe 1 and a connecting part 23 for connecting with the second connecting sleeve 4. In this way, the matching part 22 is positioned at the upper end, so that the matching part 22 is convenient to connect with the first pipeline 1, and alternatively, the matching part 22 and the first pipeline 1 can be welded and fixed by adopting tunnel furnace brazing; the connecting portion 23 is located at the lower end so as to be connected with the second connecting sleeve 4, and alternatively, the connecting portion 23 is welded with the second connecting sleeve 4.

In some embodiments, the pipe diameters of the mating portion 22 and the connecting portion 23 are the same, and as shown in fig. 1-10, the first connecting sleeve 2 is a straight sleeve, the outer diameter d2 of the mating portion 22 and the outer diameter d3 of the connecting portion 23 are equal, that is, d2=d3, and the inner diameter of the mating portion 22 and the inner diameter of the connecting portion 23 are also equal, so that the processing procedure of the second connecting sleeve 4 can be simplified. In other embodiments, where the diameters of the mating portion 22 and the connecting portion 23 are different, as in the embodiments shown in fig. 11, 13-14, the outer diameter d2 of the mating portion 22 is smaller than the outer diameter d3 of the connecting portion 23, i.e., d2 < d3, and the inner diameter of the mating portion 22 is smaller than the inner diameter of the connecting portion 23; as in the embodiment shown in fig. 12, the outer diameter d2 of the mating portion 22 is larger than the outer diameter d3 of the connecting portion 23, that is, d2 > d3, and the inner diameter of the mating portion 22 is larger than the inner diameter of the connecting portion 23, so that diameter variation is achieved to meet the user's demand for diameter variation.

In the present utility model, the pipe diameters have an inner diameter and an outer diameter, and "pipe diameter different" may include that only the outer diameters are different and the inner diameters are equal, or that only the inner diameters are different and the outer diameters are equal, or that both the outer diameters and the inner diameters are not equal. The same pipe diameter includes equal outer diameter and inner diameter. Similarly, the terms "equal" and "identical" as used herein include the case of completely equal or approximately equal dimensions, and "unequal" is the case of abrupt diameter changes.

Referring to FIGS. 8 to 14, the length of the fitting portion 22 is L4, and the fitting length of the first coupling sleeve 2 and the first pipe 1 is L3, L3. Ltoreq.L 4.

The length of the first connection sleeve 2 extending out of the end of the first pipeline 1 is L1, in other words, L1 is the length of the first connection sleeve 2 extending downward out of the lower end of the first pipeline 1, and in some embodiments, as shown in fig. 1-6 and 8-9, L1 > 0, for example, L1 may be 20mm, 22mm, 25mm, 30mm, etc.; in some embodiments, as shown with reference to fig. 7, l1=0.

In some embodiments of the present utility model, referring to fig. 1 to 7, the first pipeline 1 may include: the first pipe diameter changing part 12 and the first pipeline body 11, the first pipe diameter changing part 12 is arranged at the end part of the first pipeline body 11, specifically, the first pipe diameter changing part 12 is arranged at the lower end of the first pipeline body 11, and the first pipe diameter changing part 12 is convenient to be connected with the first connecting sleeve 2. The pipe diameter of the first pipe body 11 is different from the pipe diameter of the first pipe diameter changing portion 12.

The first pipe diameter changing part 12 is in nested fit with the first connecting sleeve 2, namely, in the axial direction of the pipeline device, the first pipe diameter changing part 12 at least partially overlaps with the first connecting sleeve 2, and the first pipe diameter changing part 12 is welded and fixed with the first connecting sleeve 2, so that the welded and fixed connection of the first pipeline 1 and the first connecting sleeve 2 is realized. Alternatively, the first pipe diameter changing portion 12 and the first connecting sleeve 2 may be welded by tunnel furnace brazing.

The length of the first pipe diameter changing part 12 matched with the first connecting sleeve 2 is L3, and the length of a welding seam between the first pipe diameter changing part 12 and the first connecting sleeve 2 can also be L3, so that the connection firmness degree of the first pipe diameter changing part 12 and the first connecting sleeve 2 can be improved. Optionally, the length of the first pipe diameter variation 12 is 15mm or more and the length of the L3 is 8mm or more. Alternatively, the first pipe diameter changing portion 12 has a length of 18mm, 20mm, 25mm, 28mm, 30mm, or the like, and the L3 is 10mm, 12mm, 15mm, 18mm, 22mm, or the like.

In some embodiments of the present utility model, referring to fig. 1 to 6, the welding position of the first coupling sleeve 2 and the first pipe diameter changing portion 12 is adapted to be offset from the welding mating surface 41 in the axial direction of the pipe device. That is, the welding position of the first pipe joint 2 and the first pipe diameter changing portion 12 does not overlap the welding surface 41 in the axial direction of the pipe joint, and the lower end portion of the first pipe diameter changing portion 12 and the upper end portion of the second connecting sleeve 4 are separated by a distance L1 to L7, so that the first pipe body 11 is also offset from the welding surface 41.

In some embodiments of the present utility model, as shown with reference to fig. 1 to 6, the minimum axial distance between the welding position of the first connecting sleeve 2 and the first pipe diameter changing portion 12 and the welding mating surface 41 is greater than or equal to 10mm. In other words, the distance between the lower end of the first pipe diameter changing portion 12 and the upper end of the second connecting sleeve 4 is greater than or equal to 10mm, i.e., L1-L7. Gtoreq.10 mm, alternatively L1-L7 may be 12mm, 13mm, 14mm, 16mm, 19mm, 23mm, etc.

In some embodiments of the present utility model, referring to fig. 1 to 7, the first pipe diameter changing portion 12 and the first pipe body 11 may be connected by the first transition portion 13, that is, the first transition portion 13 is a reducing portion of the first pipe diameter changing portion 12 and the first pipe body 11. The first transition piece 13 is offset from the welding surface 41 in the axial direction of the line arrangement.

In a specific embodiment, the first transition section 13 is generally formed by machining or other forming methods, compared with the first pipe diameter changing portion 12 and the first pipe body 11, the stress at the first transition section 13 is concentrated, and after being heated, the first transition section 13 is easy to crack, so that the first transition section 13 is staggered with the welding mating surface 41, so that the influence of the welding heat at the welding mating surface 41 on the first transition section 13 is less, and the thermal cracking at the first transition section 13 can be effectively prevented.

Alternatively, the minimum axial distance between the first transition section 13 and the welding mating surface 41 is greater than or equal to 18mm, in other words, the minimum axial distance between the lower end of the first transition section 13 and the upper end of the second connecting sleeve 4 is not less than 18mm, for example, the minimum axial distance may be 20mm, 25mm, 27mm, 31mm, 33mm, 42mm, or the like.

In some embodiments of the present utility model, referring to fig. 7, the end surface of the first pipe diameter changing portion 12 is flush with the end surface of the first connection sleeve 2, that is, l1=0. In some embodiments of the present utility model, referring to fig. 1 to 6 and 8 to 9, the first pipe diameter changing portion 12 is partially nested with the first connecting sleeve 2, that is, L1 > 0. The first pipe diameter changing portion 12 partially extends into the first connecting sleeve 2, and when the first connecting sleeve 2 is sleeved outside the first pipe diameter changing portion 12, the first pipe diameter changing portion is shown with reference to fig. 1 to 6 and 8; when the first connecting sleeve 2 is fitted inside the first pipe diameter changing portion 12, it is shown with reference to fig. 9.

In some embodiments of the present utility model, referring to fig. 1 to 7, a portion of the first coupling sleeve 2 protrudes into the second coupling sleeve 4 such that the welding engagement surface 41 overlaps a portion of the lower end of the first coupling sleeve 2, and the first pipe 1 is fixedly coupled to the first coupling sleeve 2 from above the first coupling sleeve 2, when the first pipe 1 includes the first transition section 13, the first transition section 13 may be further away from the welding engagement surface 41, heat radiation of welding heat at the welding engagement surface 41 to the first transition section 13 is small, and heat transferred to the first transition section 13 by heat transfer at the welding engagement surface 41 is also greatly reduced, so that cracking of the first transition section 13 may be prevented.

In some embodiments of the present utility model, the material of the second pipe 3 includes a second metal, taking the second metal as copper as an example, the main material of the second pipe 3 includes copper, and may also include other materials, and of course, the second pipe 3 may also be pure copper, and for convenience of description, the second pipe 3 is referred to as a copper pipe.

Referring to fig. 1 to 3 and 15 to 18, the second connecting sleeve 4 is located at one end of the second pipeline 3 near the first pipeline assembly 10, that is, the second connecting sleeve 4 is located at the upper end of the second pipeline 3, and the second connecting sleeve 4 is integrally formed with the second pipeline 3. The second connecting sleeve 4 and the second pipeline 3 are made of second metal, so that the second connecting sleeve 4 and the second pipeline 3 are formed integrally.

In some embodiments, referring to fig. 1-3 and 15-17, the second connecting sleeve 4 and the second pipe 3 have different pipe diameters. In particular, in the embodiments shown in fig. 1-3 and 15-16, the outer diameter of the second connection sleeve 4 is larger than the outer diameter of the second pipe 3, and the inner diameter of the second connection sleeve 4 is larger than the inner diameter of the second pipe 3. In the embodiment of fig. 17, the outer diameter of the second connection sleeve 4 is smaller than the outer diameter of the second pipe 3, and the inner diameter of the second connection sleeve 4 is smaller than the inner diameter of the second pipe 3.

In some embodiments, referring to fig. 1-3 and 15-17, the second pipe 3 and the second connecting sleeve 4 are connected by the second transition section 31, and an end of the anti-drip extension surface 42 remote from the welding surface 41 extends to the second transition section 31, i.e. a lower end of the anti-drip extension surface 42 extends to the second transition section 31, such that the welding surface 41 is remote from the second transition section 31, in other words, the welding surface 41 is offset from the second transition section 31 in an axial direction of the pipe arrangement.

Specifically, when the pipe diameters of the second pipe 3 and the second connecting sleeve 4 are different, the second transition section 31 is generally formed by machining or other forming methods, compared with the second pipe 3 and the second connecting sleeve 4, the stress at the second transition section 31 is concentrated, and after being heated, the second transition section 31 is easy to crack, so that the second transition section 31 is staggered with the welding matching surface 41, and therefore, the influence of the welding heat at the welding matching surface 41 on the second transition section 31 is small, and the thermal cracking at the second transition section 31 can be effectively prevented. And, the second transition section 31 is located below the anti-drip extension surface 42, and also can function to block the solder on the anti-drip extension surface 42 from continuing to drip downward. In other words, the provision of the drip-preventing extension surface 42 can reduce cracking of the second transition section 31, compared to the technical solution in which the welding mating surface 41 is immediately adjacent to the second transition section 31.

In some embodiments, referring to fig. 18, the second connecting sleeve 4 and the second pipe 3 are integrally formed, and the pipe diameters of the second connecting sleeve 4 and the second pipe 3 are the same, so that the forming process of the second connecting sleeve 4 and the second pipe 3 can be simplified.

In some embodiments of the utility model, as shown with reference to fig. 4-7 and 19-20, the material of the second conduit 3 comprises a first metal. When the first metal is iron, the main material of the second pipe 3 comprises iron, but may also comprise other materials, such as carbon, so that the second pipe 3 is a steel pipe, optionally the second pipe 3 is a stainless steel pipe. Of course, the second pipe 3 may also be a pure iron pipe. Referring to fig. 4-7 and fig. 19-20, the second pipeline 3 is nested with the second connecting sleeve 4, and the second pipeline 3 and the second connecting sleeve 4 can be fixedly connected in a welding manner.

Specifically, referring to fig. 4 to 7 and 19 to 20, the second pipe 3 may include: the second pipe body 32 and the second pipe diameter changing portion 33, the second pipe diameter changing portion 33 is disposed at an end portion of the second pipe body 32 near the first pipe assembly 10, that is, the second pipe diameter changing portion 33 is disposed at an upper end portion of the second pipe body 32.

Further, the pipe diameter of the second pipe diameter changing part 33 is different from the pipe diameter of the second pipe body 32, the second pipe body 32 and the second pipe diameter changing part 33 are connected through a third transition section 34, the second connecting sleeve 4 is in nested fit with the second pipe diameter changing part 33, and the second connecting sleeve 4 is welded and fixed with the second pipe diameter changing part 33, alternatively, the second connecting sleeve 4 and the second pipe diameter changing part 33 can be welded and fixed by adopting tunnel furnace brazing.

The drip-preventing extension surface 42 extends downwardly to the third transition piece 34, so that the welding engagement surface 41 is farther from the third transition piece 34, in other words, the welding engagement surface 41 is offset from the third transition piece 34 in the axial direction of the line device.

In a specific embodiment, the third transition section 34 is generally formed by machining or other forming methods, compared to the second pipe body 32 and the second pipe diameter changing portion 33, the stress at the third transition section 34 is concentrated, and after being heated, the third transition section 34 is easy to crack, so that the third transition section 34 is staggered with the welding mating surface 41, so that the welding heat at the welding mating surface 41 has less influence on the third transition section 34, and the thermal cracking at the third transition section 34 can be effectively prevented. In other words, providing the drip resistant extension surface 42 may reduce cracking of the third transition section 34 as compared to the solution where the weld engagement surface 41 is immediately adjacent to the third transition section 34.

In some embodiments, referring to fig. 4-7 and 20, the pipe diameter of the second pipe diameter changing portion 33 is larger than the pipe diameter of the second pipe body 32, the second pipe diameter changing portion 33 is sleeved outside the second connecting sleeve 4, and when the second pipe diameter changing portion 33 is welded with the second connecting sleeve 4, the third transition section 34 can play a role of blocking solder from sliding downwards. In other embodiments, referring to fig. 19, the pipe diameter of the second pipe diameter changing portion 33 is smaller than the pipe diameter of the second pipe body 32, the second pipe diameter changing portion 33 is sleeved inside the second connecting sleeve 4, and the third transition section 34 can play a role in preventing solder from sliding downwards when the second pipe diameter changing portion 33 is welded with the second connecting sleeve 4.

In some embodiments of the utility model, the length L6 of the anti-drip extension face 42 is not less than the length L7 of the weld engagement face 41, i.e., L6 is no less than L7. Thus, the anti-drip extension surface 42 is long, and the excessive solder at the soldering mating surface 41 can adhere to the anti-drip extension surface 42 as much as possible, preventing the excessive solder from slipping off the anti-drip extension surface 42.

In some embodiments of the utility model, the length L6 of the anti-drip extension face 42 is greater than or equal to 10mm, i.e., L6 is. Alternatively, the length L6 of the anti-drip extension face 42 may be 12cm, 15cm, 18mm, 20mm, 24mm, etc. The total length of the anti-drip extension face 42 and the welding mating face 41 (i.e., l6+l7) may be 25mm, 30mm, 32mm, 35mm, etc.

In some embodiments of the present utility model, referring to fig. 1-2, 4-5 and 7, a first protrusion 21 is further provided on the first connecting sleeve 2, and the first protrusion 21 is positioned on the free end surface of the second connecting sleeve 4. Specifically, when the first pipeline assembly 10 and the second pipeline assembly 20 are fixedly connected, the first connecting sleeve 2 is in plug-in fit with the second connecting sleeve 4, so that the upper end of the second connecting sleeve 4 is abutted against the first convex part 21 of the first connecting sleeve 2, the relative positions of the first connecting sleeve 2 and the second connecting sleeve 4 are accurate, then the connecting positions of the first connecting sleeve 2 and the second connecting sleeve 4 are subjected to welding operation, and the welding positions are accurate due to the positioning effect of the first convex part 21.

Referring to fig. 10 to 14, the first protruding portion 21 divides the first coupling sleeve 2 into a fitting portion 22 and a coupling portion 23, the fitting portion 22 is located above the first protruding portion 21, the coupling portion 23 is located below the first protruding portion 21, and the length of the coupling portion 23 is L2.

Referring to fig. 8 to 14, when the first connecting sleeve 2 is nested inside the second connecting sleeve 4, the first protrusion 21 may be provided on the outer wall surface of the first connecting sleeve 2 such that the first protrusion 21 positions the second connecting sleeve 4 from the outside of the first connecting sleeve 2.

In embodiments not shown in the figures, the first protrusion 21 may also be provided on the inner wall surface of the first connection sleeve 2 when the second connection sleeve 4 is nested inside the first connection sleeve 2, so that the first protrusion 21 positions the second connection sleeve 4 from inside the first connection sleeve 2.

Alternatively, in some embodiments, referring to fig. 13, the first protrusions 21 are configured as a plurality of first protrusions arranged at intervals in the circumferential direction of the first coupling sleeve 2. Optionally, the first protrusions are uniformly arranged along the circumferential direction of the first connecting sleeve 2, so that when the end part of the second connecting sleeve 4 is positioned, positioning points are uniformly distributed, and the positioning effect is better.

In some embodiments, referring to fig. 14, the first protrusion 21 is configured as a first annular protrusion arranged in a full circle, and the first annular protrusion continuously protrudes in the circumferential direction of the first connecting sleeve 2, so that the end portion of the second connecting sleeve 4 can be positioned in the full circle direction, and the positioning effect is better.

In some embodiments of the present utility model, referring to fig. 1, 3, 5-6 and 16, a second protrusion 43 is further provided on the second connecting sleeve 4, and the second protrusion 43 is positioned on the free end face of the first connecting sleeve 2. Specifically, when the first pipeline assembly 10 and the second pipeline assembly 20 are fixedly connected, the first connecting sleeve 2 is in plug-in fit with the second connecting sleeve 4, so that the lower end of the first connecting sleeve 2 is abutted against the second convex part 43, the relative positions of the first connecting sleeve 2 and the second connecting sleeve 4 are accurate, then the connecting positions of the first connecting sleeve 2 and the second connecting sleeve 4 are subjected to welding operation, and the welding positions are accurate due to the positioning effect of the second convex part 43.

Referring to fig. 1, 3, 5 to 6, 16, when the first connecting sleeve 2 is nested inside the second connecting sleeve 4, the second protruding portion 43 may be provided on the inner wall surface of the second connecting sleeve 4, so that the second protruding portion 43 positions the first connecting sleeve 2 from inside the second connecting sleeve 4.

In embodiments not shown in some figures, the second protrusion 43 may also be provided on the outer wall surface of the second connection sleeve 4 when the second connection sleeve 4 is nested inside the first connection sleeve 2, such that the second protrusion 43 positions the first connection sleeve 2 from outside the second connection sleeve 4.

Further, referring to fig. 1, 3, 5-6, 16, the second protrusion 43 is adapted to separate the anti-drip extension surface 42 from the welding mating surface 41 in the axial direction of the line set. In other words, the weld-engaging surface 41 is located on the side of the second boss 43 that is closer to the first conduit assembly 10, and the drip-preventing extension surface 42 is located on the side of the second boss 43 that is farther from the first conduit assembly 10. That is, the welding mating surface 41 is located on the upper side of the second convex portion 43, and the anti-drip extension surface 42 is located on the lower side of the second convex portion 43.

Alternatively, in some embodiments, the second protrusions 43 are configured as a plurality of second protrusions that are arranged at intervals in the circumferential direction of the second connecting sleeve 4. Optionally, the second protrusions are uniformly arranged along the circumferential direction of the second connecting sleeve 4, so that when the end part of the first connecting sleeve 2 is positioned, positioning points are uniformly distributed, and the positioning effect is better. In addition, the second protruding portion 43 can also block excessive solder at the welding matching surface 41, so that the solder is solidified at the welding matching surface 41 more, and excessive waste of the solder is avoided.

In other embodiments, the second protruding portion 43 is configured as a second annular protrusion arranged in a complete circle, and the second annular protrusion is continuously protruded in the circumferential direction of the second connecting sleeve 4, so that the end portion of the first connecting sleeve 2 can be positioned in the complete circle direction, and the positioning effect is better. And the second annular bulge is arranged in a whole circle, so that redundant solder at the welding matching surface 41 can be blocked, more solder is solidified at the welding matching surface 41, and excessive waste of the solder is avoided.

A line set according to an embodiment of the present utility model is described below with reference to fig. 2.

The line set includes a first line assembly 10 and a second line assembly 20.

The first pipeline assembly 10 comprises a first pipeline 1 and a first connecting sleeve 2, the first pipeline 1 is a stainless steel pipe, the first connecting sleeve 2 is a copper sleeve, and the first connecting sleeve 2 is located at the lower end of the first pipeline 1. The first pipeline 1 comprises a first pipeline body 11 and a first pipe diameter changing part 12, the first pipe diameter changing part 12 is positioned at the lower end of the first pipeline body 11, the pipe diameter of the first pipe diameter changing part 12 is smaller than that of the first pipeline body 11, and the first pipe diameter changing part 12 is connected with the first pipeline body 11 through a first transition section 13. The length of the first pipe diameter changing part 12 is 16mm, the first pipe diameter changing part 12 is partially embedded in the first connecting sleeve 2, the first pipe diameter changing part 12 and the first connecting sleeve 2 are welded and fixed by adopting tunnel furnace brazing, the welding length L3 is 10mm, and the length L1 of the first connecting sleeve 2 extending out of the end part of the first pipe diameter changing part 12 is 22mm. The first coupling sleeve 2 is provided on its outer peripheral surface with a first projection 21, the first projection 21 being configured as a first annular projection.

The second pipeline assembly 20 comprises a second pipeline 3 and a second connecting sleeve 4, the second pipeline 3 is a copper pipe, the second connecting sleeve 4 is a copper sleeve, the second connecting sleeve 4 and the second pipeline 3 are integrally formed, the second connecting sleeve 4 is positioned at the upper end of the second pipeline 3, the pipe diameter of the second connecting sleeve 4 is larger than that of the second pipeline 3, and the second connecting sleeve 4 and the second pipeline 3 are connected through a second transition section 31. The inner wall surface of the second connecting sleeve 4 comprises an anti-dripping extension surface 42 and a welding matching surface 41, the inner diameters of the anti-dripping extension surface 42 and the welding matching surface 41 are equal, the first connecting sleeve 2 partially stretches into the second connecting sleeve 4, the upper end of the second connecting sleeve 4 is abutted with the first convex part 21 of the first connecting sleeve 2, the first connecting sleeve 2 is fixed with the welding matching surface 41 in a welding mode, and the welding length L7 is 10mm. The anti-drip extension surface 42 is located below the welding mating surface 41, the lower end of the anti-drip extension surface 42 extends to the second transition section 31, excessive solder at the welding mating surface 41 can drip onto the anti-drip extension surface 42, the anti-drip extension surface 42 can absorb the dripped solder, the solder is prevented from further dripping onto the lower part, and therefore the inner sliding part of the lower part is further prevented from being blocked or abnormal sound is further prevented.

The minimum axial distance between the first transition section 13 and the welding mating surface 41 is 28mm and the length L6 of the drip-preventing extension surface 42 is 15cm.

A line set according to another embodiment of the present utility model is described below with reference to fig. 6.

The line set includes a first line assembly 10 and a second line assembly 20.

The first pipeline assembly 10 comprises a first pipeline 1 and a first connecting sleeve 2, the first pipeline 1 is a stainless steel pipe, the first connecting sleeve 2 is a copper sleeve, and the first connecting sleeve 2 is located at the lower end of the first pipeline 1. The first pipeline 1 comprises a first pipeline body 11 and a first pipe diameter changing part 12, the first pipe diameter changing part 12 is positioned at the lower end of the first pipeline body 11, the pipe diameter of the first pipe diameter changing part 12 is smaller than that of the first pipeline body 11, and the first pipe diameter changing part 12 is connected with the first pipeline body 11 through a first transition section 13. The length of the first pipe diameter changing part 12 is 16mm, the first pipe diameter changing part 12 is partially embedded in the first connecting sleeve 2, the first pipe diameter changing part 12 and the first connecting sleeve 2 are welded and fixed by adopting tunnel furnace brazing, the welding length L3 is 10mm, and the length L1 of the first connecting sleeve 2 extending out of the end part of the first pipe diameter changing part 12 is 22mm.

The second pipeline assembly 20 comprises a second pipeline 3 and a second connecting sleeve 4, the second pipeline 3 is a stainless steel pipe, the second connecting sleeve 4 is a copper sleeve, the second connecting sleeve 4 is located at the upper end of the second pipeline 3, the second pipeline 3 comprises a second pipeline body 32 and a second pipe diameter changing part 33, the second pipe diameter changing part 33 is arranged at the upper end part of the second pipeline body 32, the pipe diameter of the second pipe diameter changing part 33 is larger than that of the second pipeline body 32, the second pipeline body 32 and the second pipe diameter changing part 33 are connected through a third transition section 34, the lower end of the second connecting sleeve 4 is nested and arranged in the second pipe diameter changing part 33, and the second connecting sleeve 4 and the second pipe diameter changing part 33 are welded and fixed by adopting tunnel furnace brazing. The inner wall surface of the second connecting sleeve 4 comprises an anti-dripping extension surface 42 and a welding matching surface 41, the inner diameters of the anti-dripping extension surface 42 and the welding matching surface 41 are equal, a second convex part 43 is further arranged on the inner peripheral surface of the second connecting sleeve 4, and the second convex part 43 is configured as a second annular bulge. The welding mating surface 41 is located above the second protruding portion 43, and the anti-drip extension surface 42 is located below the second protruding portion 43. The first connecting sleeve 2 partly stretches into the second connecting sleeve 4, the lower end of the first connecting sleeve 2 is abutted against the second convex part 43 of the second connecting sleeve 4, the first connecting sleeve 2 is fixedly welded with the welding matching surface 41, and the welding length L7 is 10mm. The anti-dripping extension surface 42 is located below the welding matching surface 41, the anti-dripping extension surface 42 extends downwards to the third transition section 34, excessive solder at the welding matching surface 41 can drip onto the anti-dripping extension surface 42, the anti-dripping extension surface 42 can absorb the dripped solder, the solder is prevented from dripping onto the lower part further, and therefore the inner sliding part of the lower part is further prevented from being blocked or abnormal sound is further prevented.

The minimum axial distance between the first transition section 13 and the welding mating surface 41 is 28mm and the length L6 of the drip-preventing extension surface 42 is 15cm.

A line set according to yet another embodiment of the present utility model is described below with reference to fig. 7.

The line set includes a first line assembly 10 and a second line assembly 20.

The first pipeline assembly 10 comprises a first pipeline 1 and a first connecting sleeve 2, the first pipeline 1 is a stainless steel pipe, the first connecting sleeve 2 is a copper sleeve, and the first connecting sleeve 2 is located at the lower end of the first pipeline 1. The first pipeline 1 comprises a first pipeline body 11 and a first pipe diameter changing part 12, the first pipe diameter changing part 12 is positioned at the lower end of the first pipeline body 11, the pipe diameter of the first pipe diameter changing part 12 is smaller than that of the first pipeline body 11, and the first pipe diameter changing part 12 is connected with the first pipeline body 11 through a first transition section 13. The length of the first pipe diameter changing part 12 is 38mm, the first pipe diameter changing part 12 is partially embedded in the first connecting sleeve 2, the first pipe diameter changing part 12 and the first connecting sleeve 2 are welded and fixed by adopting tunnel furnace brazing, the welding length L3 is 32mm, the length L1 of the first connecting sleeve 2 extending out of the end part of the first pipe diameter changing part 12 is 0mm, namely the end face of the first pipe diameter changing part 12 is flush with the end face of the first connecting sleeve 2. The first coupling sleeve 2 is provided on its outer peripheral surface with a first projection 21, the first projection 21 being configured as a first annular projection.

The second pipeline assembly 20 comprises a second pipeline 3 and a second connecting sleeve 4, the second pipeline 3 is a stainless steel pipe, the second connecting sleeve 4 is a copper sleeve, the second connecting sleeve 4 is located at the upper end of the second pipeline 3, the second pipeline 3 comprises a second pipeline body 32 and a second pipe diameter changing part 33, the second pipe diameter changing part 33 is arranged at the upper end part of the second pipeline body 32, the pipe diameter of the second pipe diameter changing part 33 is larger than that of the second pipeline body 32, the second pipeline body 32 and the second pipe diameter changing part 33 are connected through a third transition section 34, the lower end of the second connecting sleeve 4 is nested and arranged in the second pipe diameter changing part 33, and the second connecting sleeve 4 and the second pipe diameter changing part 33 are welded and fixed by adopting tunnel furnace brazing. The inner wall surface of the second connecting sleeve 4 comprises an anti-dripping extension surface 42 and a welding matching surface 41, and the inner diameters of the anti-dripping extension surface 42 and the welding matching surface 41 are equal. The first connecting sleeve 2 partly stretches into the second connecting sleeve 4, the upper end of the second connecting sleeve 4 is abutted against the first convex part 21 of the first connecting sleeve 2, the first connecting sleeve 2 is fixedly welded with the welding matching surface 41, and the welding length L7 is 10mm. The anti-dripping extension surface 42 is located below the welding matching surface 41, the anti-dripping extension surface 42 extends downwards to the third transition section 34, excessive solder at the welding matching surface 41 can drip onto the anti-dripping extension surface 42, the anti-dripping extension surface 42 can absorb the dripped solder, the solder is prevented from dripping onto the lower part further, and therefore the inner sliding part of the lower part is further prevented from being blocked or abnormal sound is further prevented.

The minimum axial distance between the first transition section 13 and the welding mating surface 41 is 28mm and the length L6 of the drip-preventing extension surface 42 is 15cm.

According to another embodiment of the present utility model, the air conditioner includes the pipe device of the above embodiment, and the excessive solder at the welding positions of the first pipe assembly 10 and the second pipe assembly 20 of the pipe device can be adhered to the anti-dripping extension surface 42, so as to prevent the solder from dripping further onto the parts below the pipe device, and further prevent the internal sliding parts of the parts below from being blocked or producing abnormal noise, which is beneficial to improving the service life of the air conditioner.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (20)

1. A line set, comprising:

a first conduit assembly, the first conduit assembly comprising: a first pipeline and a first connecting sleeve arranged at the end part of the first pipeline, wherein the material of the first pipeline comprises a first metal, and the material of the first connecting sleeve comprises a second metal;

a second conduit assembly, the second conduit assembly comprising: the second pipeline and with the second adapter sleeve that the second pipeline links to each other, the material of second adapter sleeve includes the second metal, the inner wall surface of second adapter sleeve includes: the welding joint comprises a welding joint surface and an anti-dripping extension surface, wherein the first connecting sleeve at least partially stretches into the second connecting sleeve and is fixed with the welding joint surface, the anti-dripping extension surface is configured at one end of the welding joint surface far away from the first connecting sleeve, at least one connecting sleeve of the first connecting sleeve and the second connecting sleeve is also provided with a convex part, and the convex part of the connecting sleeve provided with the convex part is positioned at the end face of the free end of the other connecting sleeve;

Wherein the thermal conductivity of the second metal is higher than the thermal conductivity of the first metal.

2. The line set of claim 1 wherein the drip resistant extension surface is of equal inner diameter as the weld mating surface.

3. The line set of claim 1 wherein the material of the second line includes the second metal and the second connection sleeve is integrally formed at an end of the second line proximate the first line assembly.

4. A line set according to claim 3, wherein the second line and the second connection sleeve have different pipe diameters, the second line and the second connection sleeve being connected by a second transition section, the end of the anti-drip extension surface remote from the welding mating surface extending to the second transition section.

5. The line set of claim 1 wherein the material of the second line comprises the first metal and the second connection sleeve is nested with the second line.

6. The line set of claim 5, wherein the second line comprises: the second pipeline body and the second pipe diameter change portion that sets up the tip of second pipeline body, the pipe diameter of second pipe diameter change portion with the pipe diameter of second pipeline body is different, the second pipeline body with connect through the third changeover portion between the second pipe diameter change portion, the second adapter sleeve with the nested cooperation of second pipe diameter change portion and welded fastening, and antidrip extension face extends to third changeover portion department.

7. The line set of claim 1 wherein the length of the anti-drip extension surface is not less than the length of the weld mating surface.

8. A line set as set forth in claim 1 wherein said drip resistant extension surface is no less than 10mm in length.

9. The line set of claim 1, wherein the first coupling sleeve further has a first protrusion disposed on an inner or outer wall surface thereof, the first protrusion being positioned on a free end surface of the second coupling sleeve.

10. The line set of claim 9, wherein the first boss is configured as a plurality of first bosses spaced apart in a circumferential direction of the first coupling sleeve; or the first convex portion is configured as a first annular projection continuous in the circumferential direction of the first coupling sleeve.

11. The line set of claim 1, wherein a second protrusion is further provided on an inner wall surface or an outer wall surface of the second connection sleeve, the second protrusion being positioned at a free end surface of the first connection sleeve.

12. The line set of claim 11 wherein the second boss separates the weld mating face and the drip resistant extension face in an axial direction of the line set.

13. The line set according to claim 12, wherein the second protrusion is configured as a plurality of second protrusions arranged at intervals in a circumferential direction of the second connection sleeve; or the second protruding portion is configured as a second annular protrusion continuous in the circumferential direction of the second connecting sleeve.

14. The line set of claim 1, wherein the first line comprises: the pipe comprises a first pipeline body and a first pipe diameter changing part arranged at the end part of the first pipeline body, wherein the pipe diameter of the first pipe diameter changing part is different from that of the first pipeline body, and the first connecting sleeve is in nested fit with the first pipe diameter changing part and welded and fixed.

15. The line set of claim 14 wherein the first line body and the first pipe diameter change are connected by a first transition section that is offset from the weld interface in an axial direction of the line set.

16. The line set of claim 15 wherein the minimum axial distance of the first transition section from the weld interface is not less than 18mm.

17. The line set of claim 14 or 15, wherein an end surface of the first pipe diameter changing portion is flush with an end surface of the first connection sleeve.

18. A line set according to any one of claims 1-16, wherein the first connection sleeve portion extends into the second connection sleeve.

19. A line set according to any one of claims 1-16, wherein the first metal is iron and/or the second metal is copper.

20. An air conditioner comprising a pipe device according to any one of claims 1 to 19.

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