CN110735974A

CN110735974A - pipe fitting connecting structure, manufacturing method thereof, liquid storage device and refrigerating system

Info

Publication number: CN110735974A
Application number: CN201810803725.2A
Authority: CN
Inventors: 不公告发明人
Original assignee: Xinchang Four Link Electromechanical Co Ltd
Current assignee: Xinchang Four Link Electromechanical Co Ltd
Priority date: 2018-07-20
Filing date: 2018-07-20
Publication date: 2020-01-31
Anticipated expiration: 2038-07-20
Also published as: CN110735974B

Abstract

pipe fitting connection structure, comprising an aluminum pipe fitting, a stainless steel pipe fitting and a copper pipe fitting, wherein the aluminum pipe fitting comprises an aluminum pipe joint part, the stainless steel pipe fitting comprises a stainless steel pipe fitting joint part and a stainless steel pipe fitting second joint part, the copper pipe fitting comprises a copper joint part, the aluminum pipe joint part and the stainless steel pipe fitting joint part are welded, the stainless steel pipe fitting second joint part and the copper joint part are welded, the aluminum pipe joint part and the copper joint part are not in contact, of the stainless steel pipe fitting second joint part and the copper joint part are defined as th pipe fitting joint parts, of the stainless steel pipe fitting second joint part and the copper joint part are defined as second pipe fitting joint parts, and the second pipe fitting joint part is at least partially located in the th pipe fitting joint part.

Description

pipe fitting connecting structure, manufacturing method thereof, liquid storage device and refrigerating system

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of pipeline connection, in particular to the field of refrigeration.

[ background of the invention ]

Products in the refrigeration technology field include air conditioners, refrigerators, freezers and the like, these systems use copper pipes as connecting pipes to connect two parts, in order to connect with the copper pipes conveniently, many parts are also made of copper materials correspondingly, such as basic parts in refrigeration systems like liquid reservoirs, silencers and the like, but these parts are all likely to be changed in materials, such as aluminum materials and the like, and the connection problem between different materials can be used in the systems.

Such a system may involve the problem of how to achieve the fixing of the connection between the aluminum material and the copper material.

[ summary of the invention ]

According to the pipe connecting structure, liquid accumulators with the pipe connecting structure, refrigeration systems with the pipe connecting structure and manufacturing method of the pipe connecting structure, the connection between an aluminum pipe and a stainless steel pipe of the pipe connecting structure is stable.

In order to achieve the purpose, the invention adopts the following technical scheme:

pipe fitting connection structure, comprising an aluminum pipe fitting, a stainless steel pipe fitting and a copper pipe fitting, wherein the aluminum pipe fitting comprises an aluminum pipe joint part, the stainless steel pipe fitting comprises a stainless steel pipe fitting joint part and a stainless steel pipe fitting second joint part, the copper pipe fitting comprises a copper joint part, the stainless steel pipe fitting second joint part is welded with the copper joint part, the assembly of the stainless steel pipe fitting and the copper pipe fitting which are welded is welded with the aluminum pipe fitting, the aluminum pipe joint part is not contacted with the copper joint part, of the stainless steel pipe fitting second joint part and the copper joint part are defined as a pipe fitting joint part, another of the stainless steel pipe fitting second joint part and the copper joint part are defined as a second pipe fitting joint part, and the second pipe fitting joint part is at least partially positioned in the pipe fitting joint part;

the pipe fitting joint portion's inner wall has a plurality of bellying, the bellying at least partly with the outer wall interference fit or the butt of second pipe fitting joint portion, perhaps, the outer wall of second joint portion has a plurality of bellyings, the bellying at least partly with the outer wall interference fit or the butt of second pipe fitting joint portion.

In the technical scheme, at least part of the protruding part is in interference fit or butt joint with the outer wall of the joint part of the second pipe fitting, or the outer wall of the joint part of the second pipe fitting is provided with a plurality of protruding parts, at least part of the protruding part is in interference fit or butt joint with the outer wall of the joint part of the second pipe fitting, when the th pipe fitting and the second pipe fitting are assembled and welded in a furnace, the th pipe fitting and the second pipe fitting do not need to be fixed by other tools, the assembly formed by welding the stainless steel pipe fitting and the copper pipe fitting and the aluminum pipe joint part are welded, the aluminum pipe joint part is not in contact with the copper joint part, the contact potential difference corrosion phenomenon between the aluminum pipe fitting and the copper pipe fitting can be avoided, and the connection of the pipe fitting connection structure is stable.

The technical scheme also provides liquid accumulators, which comprise tank bodies and pipe fitting connecting structures, wherein the pipe fitting connecting structures are the pipe fitting connecting structures, the tank bodies are made of aluminum materials, and the tank bodies and the aluminum pipe are arranged or welded;

or, the pipe connection structure is the above pipe connection structure, the tank body is a copper material, the tank body with the copper pipe body sets up or the welding sets up.

The technical scheme also provides refrigeration systems, which comprise a part, wherein the part comprises the above pipe fitting connection structure, the refrigeration system comprises a copper pipeline connected with the copper pipe fitting, the copper pipe fitting is connected with the copper pipeline in a welding manner, and the melting temperature of the solder used for welding the copper pipe fitting and the copper pipeline is lower than that of the solder of .

The technical scheme also provides a manufacturing method of the pipe fitting connecting structure, the pipeline connecting piece comprises an aluminum pipe fitting, a stainless steel pipe fitting and a copper pipe fitting, and the manufacturing method of the pipeline connecting piece comprises the following steps:

forming convex parts at the joints of of the stainless steel pipe fitting and the copper pipe fitting, wherein the convex parts are in interference fit or abut against the joints of other pipe fittings;

and welding the joint part of the aluminum pipe fitting or the joint part of the aluminum pipe fitting in the part where the joint part of the aluminum pipe fitting is positioned with the th joint part of the stainless steel in the assembly after the stainless steel pipe fitting and the copper pipe fitting are welded.

The technical scheme also provides a manufacturing method of the pipe fitting connecting structure, the pipeline connecting piece comprises an aluminum pipe fitting and a stainless steel pipe fitting, and the manufacturing method of the pipeline connecting piece comprises the following steps:

the joint parts of pipes in the aluminum pipe fitting and the stainless steel pipe fitting are formed with convex parts which are in interference fit with or abut against the joint parts of other pipes, the joint parts of the stainless steel pipe fitting and the joint parts of the aluminum pipe fitting are welded, and the melting temperature of welding materials of the stainless steel pipe fitting and the aluminum pipe fitting during welding is larger than 580 ℃.

According to the pipe fitting connecting structure manufactured by the manufacturing methods, the contact potential corrosion between the aluminum and the stainless steel pipe fitting of the pipe fitting connecting structure is relatively small, and the connection between the aluminum pipe fitting and the stainless steel pipe fitting of the pipe fitting connecting structure is relatively stable.

[ description of the drawings ]

FIG. 1 is a schematic perspective view of kinds of liquid reservoirs according to the present invention;

FIG. 2 is a degree cross-sectional view of the tube assembly and associated parts of the reservoir of FIG. 1;

FIG. 3 is a schematic view of a portion of the copper pipe shown in FIG. 2;

FIG. 4 is an enlarged schematic view of a portion Q of the reservoir of FIG. 2;

fig. 5 is a schematic cross-sectional view in the direction C-C of the relevant portion of the reservoir shown in fig. 4;

FIG. 6 is an enlarged schematic view of portion N of FIG. 5;

FIG. 7 is a cross-sectional views of the relevant portions of another embodiments of stainless steel and copper tubing;

FIG. 8 is a schematic view of a portion of the copper tubing of FIG. 7;

fig. 9 is an enlarged partial schematic view of a relevant portion of a second reservoir;

fig. 10 is an enlarged partial schematic view of a relevant portion of a third reservoir;

fig. 11 is an enlarged partial schematic view of a relevant portion of a fourth reservoir;

fig. 12 is an enlarged schematic view of a portion of the reservoir P shown in fig. 2;

fig. 13 is a schematic cross-sectional view of the relevant portion of the reservoir of fig. 12 taken in the direction D-D;

fig. 14 is an enlarged schematic view of a portion M shown in fig. 13;

fig. 15 is an enlarged partial schematic view of relevant portions of a fifth reservoir;

fig. 16 is a partially enlarged schematic view of a relevant portion of a sixth reservoir;

FIG. 17 is a schematic cross-sectional views of the relevant portion shown in FIG. 16;

fig. 18 is a schematic cross-sectional view of relevant portions of a seventh reservoir;

fig. 19 is a schematic drawing of cross-sections of relevant portions of an eighth reservoir, the symbolic illustration

[ detailed description ] embodiments

The invention is further described with reference to the following figures and embodiments:

1-6, as shown in FIGS. 1-6, the reservoir 100 includes a tank 1 and a pipe connection structure including an aluminum pipe 21, 21 ', a stainless steel pipe 22, 22' and a copper pipe 23, 23 ', the aluminum pipe 21, 21' is welded to the tank 1 or is formed, the aluminum pipe 21 includes an aluminum pipe joint 211, the stainless steel pipe 22 includes a stainless steel pipe and a stainless steel pipe second joint 222, the copper pipe 23 includes a copper joint 231, the aluminum pipe 211 is welded to a stainless steel pipe 221, the stainless steel pipe second joint 222 is welded to the copper joint 231, wherein the aluminum pipe related to the above and all the above includes aluminum or aluminum alloy containing aluminum as a main component, the stainless steel pipe includes stainless steel and carbon steel, the copper pipe 22 when the stainless steel pipe 21 and the copper pipe 21 and the stainless steel pipe 21 or the stainless steel pipe 21 and the copper pipe 21 are welded to the stainless steel pipe 21 or the stainless steel pipe 21 and the stainless steel pipe 21 or the stainless steel pipe 21 when the stainless steel pipe 21 and the stainless steel pipe 21 or the stainless steel pipe 21 and the stainless steel pipe 2 or the stainless steel pipe 2 or the stainless steel pipe 2 pipe or the stainless steel pipe 2 or the stainless steel pipe 21 or the stainless steel pipe 21 or the stainless steel pipe 2 or the stainless steel pipe 21 or the stainless steel pipe 2 or the stainless steel pipe 21 or the stainless steel pipe 2 or the stainless steel pipe 2 or the stainless steel pipe 21 or the stainless steel pipe 2 or the stainless steel pipe 21 or the stainless steel pipe 2 or the stainless steel pipe 21 or the stainless steel pipe or the.

As shown in fig. 1, the accumulator 100 further includes th tube assembly 2 and a second tube assembly 2 ', wherein the th tube assembly 2 includes an aluminum tube 21, a stainless steel tube 22 and a copper tube 23, the second tube assembly 2 ' includes an aluminum tube 21 ', a stainless steel tube 22 ' and a copper tube 23 ', the th tube assembly 2 can be regarded as an outlet pipeline of the accumulator, and the second tube assembly 2 ' can be regarded as an inlet pipeline of the accumulator, it should be noted that, in the illustration, the aluminum tube 21 is separately provided with the tank body, such as by welding, the aluminum tube 21 ' is formed with the tank body , and the tank body 1 is made of aluminum.

In the embodiment shown in fig. 2, the stainless steel pipe 22 is located between the aluminum pipe 21 and the copper pipe 23 or the stainless steel pipe 22 is disposed, so that the galvanic corrosion of the aluminum pipe 21 and the copper pipe 23 can be relatively reduced. The difference between the potential difference of the aluminum pipe 21 and the stainless steel pipe 22 is smaller than that of the aluminum pipe 21 and the copper pipe 23, so that the potential difference corrosion of the aluminum pipe 21 is smaller than that of the aluminum pipe 21 when the aluminum pipe 21 and the stainless steel pipe 22 are welded under the same conditions, such as in an acidic or alkaline environment, or in an environment capable of causing the potential difference corrosion, such as in a sea wind environment; the difference in potential difference between the stainless steel pipe fitting 22 and the copper pipe fitting 23 is smaller than the difference in potential difference between the aluminum pipe fitting 21 and the copper pipe fitting 23, so that in an acidic or alkaline environment, or an environment that can cause potential difference corrosion, such as a sea wind environment, when the copper pipe fitting 23 is welded to the stainless steel pipe fitting 22, the potential difference corrosion of the copper pipe fitting 23 is smaller than that when the copper pipe fitting 23 is welded to the aluminum pipe fitting 21; the welding of the aluminum pipe 21 and the stainless steel pipe 22 and the welding of the copper pipe 23 and the stainless steel pipe 22 relatively reduce the potential difference corrosion of the aluminum pipe 21 and the potential difference corrosion of the copper pipe 23.

The equivalent inner diameter of the second stainless steel pipe fitting 222 is larger than the equivalent inner diameter of the copper fitting 231, or at least a portion of the copper fitting 231 extends into the second stainless steel pipe fitting 222, i.e., the stainless steel pipe fitting 22 is a fifth stainless steel pipe fitting , the copper fitting 23 includes the outer wall 2311 of the copper fitting 231, the outer wall of the copper fitting 2311 has a plurality of grooves 234 and a plurality of protrusions 235, i.e., the outer wall of the second stainless steel pipe fitting has a plurality of grooves 234, the grooves 234 are recessed toward the center of the copper fitting 23 relative to the protrusions 235 when the copper fitting is welded to the inner wall of the stainless steel pipe fitting 231, or the inner wall of the stainless steel pipe fitting 22 is a fifth stainless steel pipe fitting 1, or the inner wall of the stainless steel pipe fitting 235 is a fifth stainless steel pipe fitting 23, or the inner wall of the stainless steel pipe fitting 235 is welded to the inner wall of the stainless steel pipe fitting 1, or the inner wall of the stainless steel pipe fitting 22, or the stainless steel pipe fitting 235 is a fifth stainless steel pipe fitting 235, or a sixth stainless steel pipe fitting 23, or a fifth stainless steel pipe fitting 235 is a sixth stainless steel pipe fitting 23, or a fifth stainless steel pipe fitting 2, or a sixth stainless steel pipe fitting 23, or a sixth steel pipe fitting 7, or a sixth steel pipe fitting 23, wherein the inner wall of a fifth steel pipe fitting is formed by a sixth steel pipe fitting 21 is formed by a fifth steel pipe fitting 2, a sixth steel pipe fitting or a sixth steel pipe fitting 2, or a sixth steel pipe fitting 2, a sixth steel pipe fitting or a stainless steel pipe fitting or a sixth steel pipe fitting or a stainless steel or a sixth steel or a stainless steel pipe fitting or a stainless steel pipe fitting or a stainless steel pipe fitting or a stainless steel pipe fitting or a stainless steel or a stainless steel or a stainless steel pipe fitting or stainless steel or a stainless steel or stainless steel pipe fitting or a stainless steel or stainless steel pipe fitting or stainless steel or a stainless steel or a stainless steel or a stainless steel or stainless steel pipe fitting or stainless steel pipe fitting or stainless steel fitting or stainless steel pipe fitting or stainless steel fitting or stainless steel pipe fitting or stainless steel fitting.

Referring to fig. 3, the stainless steel pipe 22 includes a stainless steel main body 226 and a stainless steel inner step 225, the stainless steel inner step 225 is disposed in a flaring manner with respect to the stainless steel main body 226, or the equivalent diameter of the stainless steel inner step 225 is larger than the equivalent diameter of the stainless steel main body 226, the stainless steel inner step forms an annular space 223 along the axial direction of the stainless steel pipe 22, and the annular space 223 is used for disposing a welding ring for welding, so that after the stainless steel pipe 22 and the copper pipe 23 are welded by furnace welding, such as passing through a tunnel furnace, the welding ring is melted to fill the space between the groove 234 and the inner wall 2221 of the stainless steel pipe second joint portion, thereby forming a partial or full th welding seam 233.

Referring to fig. 7-8, when the stainless steel pipe 22 "is welded to the copper pipe 23", an external weld ring may be used for welding, in which case, the groove 234 "has a length L1 along the axial direction of the copper joint 231" for the welding strength between the stainless steel pipe 22 "and the copper pipe 23" or for facilitating the welding between the copper pipe 23 "and the stainless steel pipe 22", the copper joint 231 "and the stainless steel pipe second joint 222" have a matching length L2 (ignoring the guiding length of the copper joint only or ignoring the guiding length of the copper joint without a groove near the copper port), and the length L1 of the groove 234 "is greater than the matching length L2 of the copper joint 231" and the stainless steel pipe second joint 222 ", so that the groove 234" is provided at a position corresponding to the weld ring during the assembly before the stainless steel pipe 22 "is welded to the copper pipe 23", which facilitates the welding of the weld ring when the stainless steel pipe 22 "is welded to the copper pipe 23" and the copper pipe 23 "are welded.

Referring to fig. 9, the equivalent inner diameter of the stainless steel pipe second joint part 222b is larger than that of the copper joint part 231, or at least a portion of the copper joint part 231 extends into the stainless steel pipe second joint part 222b, i.e., the stainless steel pipe 22b is the -th pipe, the copper pipe 23b is the second pipe, the inner wall of the stainless steel pipe second joint part 222b includes a plurality of grooves 234b and protrusions 227b, i.e., the inner wall of the -th pipe has a plurality of grooves 234b, the outer wall 2311b of the copper joint part is at least partially in interference or abutting contact with the inner wall of the stainless steel pipe second joint part 222b, the outer wall of the copper joint part 231b and the inner wall of the stainless steel pipe second joint part 222b have a -th gap 233b, the -th gap 233b becomes a filling part when the copper joint part 231b and the stainless steel pipe second joint part 222b are welded, the pipe joint part 357 b becomes a fifth pipe filling part when the copper joint part 231b and the stainless steel pipe part 231b is welded with the stainless steel pipe second joint part 222b, the stainless steel joint part b is arranged along the axial direction of the stainless steel joint groove 234b, or the stainless steel joint part 36 b is arranged along the axial direction of the stainless steel joint groove 234b, so that the stainless steel joint part runs along the axial direction of the stainless steel joint part 234b, the stainless steel joint part of the stainless steel joint part 23b, the stainless steel joint part may be arranged along the axial direction of the axial direction after the stainless steel joint part b, the stainless steel joint 234b is arranged along the axial direction of the stainless steel joint part, the stainless steel joint part may be arranged.

Referring to fig. 10, the equivalent inner diameter of the copper joint 231c is larger than that of the stainless steel pipe fitting second joint part 222c, or at least a portion of the stainless steel pipe fitting second joint part 222c extends into the copper joint 231c, i.e., the copper pipe fitting 23c is a pipe fitting, the stainless steel pipe fitting 22c is a second pipe fitting, the outer wall of the stainless steel second joint part 222c includes a plurality of grooves 234c and protrusions 227c, i.e., the outer wall of the second pipe fitting has a plurality of grooves 234c, the grooves 234c are recessed from the protrusions 227c in a direction toward the center of the stainless steel pipe fitting second joint part along the radial direction of the stainless steel pipe fitting second joint part, at least a portion of the grooves 234c extends along the axial direction of the stainless steel second joint part 222c, the grooves 234c are spaced apart from the stainless steel pipe fitting 227c along the axial direction of the stainless steel second joint part 222c, or the grooves 234c extend along the axial direction of the stainless steel pipe fitting second joint part 222c along the axial direction of the stainless steel second joint part 222c, or the grooves 234c are arranged along the axial direction of the stainless steel pipe fitting 233c along the stainless steel joint part 222c, or the inner wall of the stainless steel joint part 231c is welded with the inner wall 26 c, the inner wall of the stainless steel joint part 26 c, or the inner wall of the stainless steel fitting 24 c is welded joint 26 c, so that the inner wall 26 c is welded joint 26 c, the inner wall 26 c, the gap 26 c, the capillary gap is increased when the inner wall 26 c is welded joint 26 c, the inner wall 26 c, or the inner wall 26 c, the capillary gap is welded stainless steel joint 26 c, the capillary gap is welded joint 26 c, the capillary gap, or the capillary gap is welded joint 26 c, the capillary gap is formed when the inner wall 26 c, the inner wall of the inner wall 26 c, or the inner wall of the stainless steel pipe.

Referring to fig. 11, the equivalent inner diameter of the copper joint 231d is larger than that of the stainless steel pipe fitting second joint part 222d, or at least a portion of the stainless steel pipe fitting second joint part 222d extends into the copper joint part 231d, i.e., the copper pipe fitting 23d is the th pipe fitting, the stainless steel pipe fitting 22d is the second pipe fitting, the inner wall of the copper joint part 231d includes a plurality of grooves 234d and protrusions 235d, i.e., the inner wall of the th pipe fitting has a plurality of grooves 234d, the grooves 234d are recessed from the protrusions 235d in the radial direction of the copper joint part, at least a portion of the grooves 234d extend in the axial direction of the copper joint part 231d, the grooves 234d are spaced apart in the axial direction of the copper joint part 231d, or the grooves 234d extend in the axial direction of the copper joint part 231d, or the grooves 3578 d extend in the axial direction of the copper joint part 231d, the pipe fitting connection structure includes the stainless steel pipe fitting 22d, the stainless steel pipe fitting second joint part 222d has a stainless steel pipe fitting second joint part 2221d, the inner wall of the stainless steel pipe fitting 231d and the inner wall d is welded with a gap, or a gap 27 d, so that the inner wall of the stainless steel pipe fitting 231d is welded with a capillary gap 27 d, or a capillary gap 27 d, so that when the inner wall of the stainless steel pipe fitting 231d is welded between the stainless steel pipe fitting 231d, or a capillary gap 35233 d, a capillary gap 27 d, or a capillary gap, a capillary gap 27 d, a capillary gap, or a capillary gap, a.

The term "tube joint structure" as used herein means that the tube joint structure includes a first tube head portion and a second tube head portion, wherein at least a portion of the second tube head portion is located inside the second tube head portion, or the term "0" refers to a tube head portion having an equivalent inner diameter greater than the equivalent inner diameter of the second tube head portion, or the term "0" refers to a tube joint structure "2" refers to a tube joint structure "3" refers to a tube joint structure "2" refers to a tube structure "2" refers to a tube joint structure "2" or a tube joint structure "2" refers to a tube joint structure "may be formed by a tube joint structure" 2 "or a tube structure" may be welded with a tube joint structure "or a tube structure" 2 "may be welded with a tube joint tube structure" or a tube joint structure "may be welded with a tube joint structure" or a tube joint tube structure "or a tube structure" 2 "may be welded with a tube joint tube structure" or a tube joint tube structure "such as a tube joint tube structure" may be welded with a tube joint tube structure "may be welded with a tube joint tube structure" 2 "or a tube structure" may be welded with a tube structure "or a tube joint tube structure" may be welded with a tube joint tube structure "or tube joint tube structure" may be welded with a tube joint tube structure "or tube joint tube structure" or a tube joint tube structure "a tube joint tube structure" may be welded with a tube structure "a tube joint tube structure" or a tube structure "or tube structure" a tube joint tube structure "may be welded with a tube structure" or a tube joint tube structure "or tube structure" may be welded with a tube structure "or a stainless steel tube structure" 2 "a tube joint tube structure" or tube structure "may be welded with a stainless steel tube structure" or a stainless steel tube structure "may be welded with a stainless steel tube structure" or tube structure "may be welded with a stainless steel tube structure" or a stainless steel tube structure "may be welded with a stainless steel tube 2" or a stainless steel tube 2 "may be welded with a stainless steel tube or a stainless" may be welded with a stainless "may be welded with a stainless" or a stainless "or a stainless" 2 "or a stainless" may be welded with a stainless "2" or a stainless "may be welded with a stainless" or a stainless "may be welded with a stainless" or a stainless "or a stainless" may be welded with a stainless "or a stainless" or a stainless "or a stainless" may be welded with a stainless "or a stainless" or a stainless "may be welded with a stainless" the inner wall "a stainless" a "or a stainless" may be welded with a stainless "or a stainless" the inner wall "a welded with a stainless" the inner wall "or a stainless" a stainless "or a stainless" may be welded with a stainless "the inner wall 2" or a stainless "may be welded with a stainless" or a stainless "the inner wall 2" may be welded with a stainless "or a stainless" may be a stainless "the inner wall 2" may be a stainless "the inner wall 2" may be a stainless "the inner wall 2" or a stainless "or a stainless" may be welded with a stainless "the inner wall 2" may be a stainless "the inner wall 2" or a stainless "the inner wall 2" may be a stainless "or a stainless" may be a stainless "or a stainless" the inner wall 2 "a stainless" may be a welded with a stainless "may be a welded with a" or a welded with a stainless "may be a" the inner wall 2 "may be a stainless" the inner wall 2 "may be a stainless" or a welded with a stainless "or a" a stainless "or a welded with a" a stainless "a welded with a stainless" the inner wall 2 "a stainless" or a stainless "the inner wall 2" or a stainless "the inner wall 2 or a stainless" a welded with a stainless "the inner wall 2 or a welded with a stainless" a welded with a stainless "a welded with a tube or a stainless" a welded with a tube or a welded with a stainless "a welded with a tube or a stainless" or a stainless "a tube or a welded with.

Referring to fig. 12, the stainless steel pipe joint 221 includes a stainless steel pipe joint end 2214 and a stainless steel pipe 0 joint fitting tail 2215, wherein along the axial direction of the stainless steel pipe 1 joint, the fitting segment 2213 is located between the stainless steel pipe 4629 2 joint fitting tail 2215 and the stainless steel pipe 3 joint end 2214, the stainless steel pipe joint fitting tail 2215 is the portion farthest from the stainless steel pipe 6 joint end 2214 in the fitting between the stainless steel pipe and the aluminum pipe 211, along the axial direction of the stainless steel pipe 7 joint 221 or along the axial direction of the second type joint, the stainless steel pipe joint 221 is continuously extended from the stainless steel pipe 589 joint end 2214 to the stainless steel pipe joint tail 2215, and is more specifically set to a temperature equal to or higher than the normal welding temperature of the stainless steel pipe 849 when the stainless steel pipe 221 and the stainless steel pipe 2 joint is welded to the stainless steel pipe 8621, or the inner wall of the stainless steel pipe 2 is welded to the inner wall of the stainless steel pipe 8621, the stainless steel pipe or the inner wall of the stainless steel pipe connector may be welded to the inner wall of the stainless steel pipe 8421, the stainless steel pipe or to the inner wall of the stainless steel pipe connector 2 of the stainless steel pipe connector, the stainless steel pipe connector may be welded to the inner wall of the stainless steel pipe connector or to be welded to the inner wall of the stainless steel pipe connector or to be welded to be the inner wall of the stainless steel pipe connector of the stainless steel pipe 8421.

Of course, when at least part of the aluminum pipe joint is located in the joint of the stainless steel pipe fitting, the joint of the aluminum pipe includes the joint end of the aluminum pipe and the joint mating tail of the aluminum pipe, along the axial direction of the 2 joint of the aluminum pipe, the 3 joint 221 of the aluminum pipe is continuously extended from the joint end of the aluminum pipe to the joint mating tail of the aluminum pipe, the 856 joint of the aluminum pipe has a joint lumen of the aluminum pipe, the inner wall of the joint of the aluminum pipe forms the lumen of the joint of the aluminum pipe, the lumen of the joint of the aluminum pipe is a cavity, or it can be said that the inner wall of the joint of the aluminum pipe is exposed in the lumen of the joint of the aluminum pipe, or it can be said that the inner wall of the joint of the aluminum pipe is not directly contacted with other member or pipe fitting in the direction toward the center of the aluminum pipe, or it can be said that the inner wall of the joint of the aluminum pipe fitting is directly contacted with the working medium, so that the stainless pipe fitting can be welded with the stainless steel pipe fitting only by welding, it can be easily sealed with the ring-shaped aluminum pipe fitting along the ring-shaped liner of the ring-shaped aluminum pipe fitting, or ring-shaped liner, more specifically, it can be easily sealed by welding, it can be easily sealed along the ring-shaped liner of the ring-shaped aluminum pipe fitting, or ring-shaped aluminum pipe fitting, it can be easily, it can be.

Referring to FIG. 15, the stainless steel pipe fitting fitting 221a is a head portion of a type stainless steel pipe fitting, the aluminum pipe fitting is a head portion of a second type stainless steel pipe fitting, the stainless steel pipe fitting th 0 fitting 221a has an equivalent outer diameter greater than that of the aluminum pipe fitting 211a, or the aluminum pipe fitting 211a extends into the stainless steel pipe fitting 22 a. the aluminum pipe fitting 21a includes an aluminum pipe fitting body 212a, at least a portion of the aluminum pipe fitting 211a is set in a necking manner with respect to the aluminum pipe fitting body 212a, the aluminum pipe fitting 211a includes a necking portion 26a, the outer wall of the necking portion 26a has a plurality of protrusions 261a and a body portion 262a, the necking portion 26a further includes a necking guide portion 263a, wherein the stainless steel pipe fitting th 1 th 221a has a, the stainless steel pipe fitting th 2 fitting inner wall 261a, the protrusions 261a is in a position or interference fit with the inner wall 261a of the stainless steel pipe fitting 26a 24 a, the stainless steel pipe fitting 221a further, the stainless steel pipe fitting 221a is set with the stainless steel pipe fitting 221a, or the stainless steel pipe fitting 221a 2a, the stainless steel pipe fitting 221a further, the stainless steel pipe fitting 221a is set in a, the stainless steel pipe fitting 26a, the stainless steel pipe fitting 211a, the stainless steel pipe fitting 26a, the stainless steel pipe fitting 211a is set in a, the stainless steel pipe fitting 26a, or the stainless steel pipe fitting 26a, the stainless steel pipe fitting 26a is set with the stainless steel pipe fitting 26a, or the stainless steel pipe fitting 26a, the stainless steel pipe fitting 26a is set in the stainless steel pipe fitting 26a, the stainless steel pipe fitting 26;

referring to fig. 18, the protrusion 261f is a strip-shaped protrusion, the inner wall of the th joint part 221f of the stainless steel pipe fitting has a protrusion 261f and a body part 262f, the protrusion 261f is disposed to protrude inward relative to the body part 262f, at least a part of the protrusion 261f is in interference fit or abutting contact with the outer wall of the aluminum pipe joint part 211f, a second gap 25f is provided between the body part 262f and the outer wall of the aluminum pipe joint part 211f, and the second gap 25f is referred to as the second gap 25.

Referring to fig. 19, th joint part 221g of the stainless steel pipe fitting has an outer wall portion which is in interference fit with or abuts against an inner wall of the aluminum pipe joint part 211g, the end and a portion near the end of the aluminum pipe joint part 211g are in a bell mouth shape, a second gap 25g is formed between the th joint part 221g portion of the stainless steel pipe fitting and the inner wall of the aluminum pipe joint part 211g, in this embodiment, when the th joint part 221g of the stainless steel pipe fitting is welded to the joint part 211g, the th joint part 221g portion of the stainless steel pipe fitting has an outer wall portion which is in interference fit with or abuts against the inner wall of the aluminum pipe joint part 211g, no other jig is required, the th joint part 221g of the stainless steel pipe fitting and/or the aluminum pipe joint part 211g may not be provided with a projection, a second gap 25g is formed between the outer wall portion of the th joint part 221g of the stainless steel pipe fitting and the inner wall of the aluminum pipe joint part 211g, and the second gap 25g contributes to escape of steam during.

In order to secure the welding strength of the pipe connection structure, the aluminum pipe joints 211 and 211a or the th joint 221 and 221a, the stainless pipe joint

second joints

222, 222b, 222c and 222d or the

copper joint

231, 231b, 231c and 231d have an extension length, and when the extension length is too short, a phenomenon of weak welding is easily caused, and when the extension length is too long, waste of materials is easily caused.

When at least part of the -th joint part 221 of the stainless steel pipe fitting is positioned in the aluminum pipe joint part 211, the extending length of the -th joint part 221 of the stainless steel pipe fitting refers to the length of the -th joint part 221 of the stainless steel pipe fitting extending into the aluminum pipe joint part 211 along the axial direction of the -th joint part 211 of the stainless steel pipe fitting, the extending length of the -th joint part 221 of the stainless steel pipe fitting is more than or equal to three times the wall thickness of the -th joint part 221 or the aluminum pipe joint part 211, and/or the extending length of the -th joint part 221 of the stainless steel pipe fitting is more than or equal to sixty percent of the equivalent outer diameter of the -th joint part 221 of the aluminum pipe joint part 211 or the stainless steel pipe fitting;

when at least a part of the aluminum pipe joint 211a is located in the th joint 221a of the stainless steel pipe fitting, the protruding length of the aluminum pipe joint 211a refers to the length of the aluminum pipe joint 211a protruding into the th joint 221a of the stainless steel pipe fitting along the axial direction of the aluminum pipe joint 211a, the protruding length of the aluminum pipe joint 211a is equal to or greater than three times the wall thickness of the aluminum pipe joint 211a or the th joint 221a of the stainless steel pipe fitting, and/or the protruding length of the aluminum pipe joint 211a is equal to or greater than sixty percent of the equivalent outer diameter of the aluminum pipe joint 211a or the th joint 221a of the stainless steel pipe fitting;

when at least a portion of the

copper joint parts

231 and 231b is located in the stainless steel pipe fitting second joint parts 221 and 221b, the protruding length of the

copper joint parts

231 and 231b refers to the length of the

copper joint parts

231 and 231b protruding into the stainless steel pipe fitting second joint parts 221 and 221b along the axial direction of the

copper joint parts

231 and 231b, the protruding length of the

copper joint parts

231 and 231b is equal to or greater than three times the wall thickness of the stainless steel pipe fitting second joint parts 221 and 221b or the

copper joint parts

231 and 231b, and/or the protruding length of the copper

joint parts

231 and 231b is equal to or greater than sixty percent of the equivalent diameter of the stainless steel pipe fitting second joint parts 221 and 221b or the copper

joint parts

231 and 231 b.

When at least a part of the stainless steel pipe fitting second joint parts 221c and 221d or the

copper joint parts

231c and 231d, the extending length of the stainless steel pipe fitting second joint parts 221c and 221d refers to the length of the stainless steel pipe fitting second joint parts 221c and 221d extending into the copper

joint parts

231c and 231d along the axial direction of the stainless steel pipe fitting second joint parts, the extending length of the stainless steel pipe fitting second joint parts 221c and 221d is greater than or equal to three times of the wall thickness of the stainless steel pipe fitting second joint parts 221c and 221d or the

copper joint parts

231c and 231d, and/or the extending length of the stainless steel pipe fitting second joint parts 221c and 221d is greater than or equal to sixty percent of the equivalent diameter of the stainless steel pipe fitting second joint parts 221c and 221d or the

copper joint parts

231c and 231 d;

A refrigeration system comprises a part, wherein the part comprises the above pipe fitting connection structure, the refrigeration system comprises a copper pipeline connected with the copper pipe fitting, the copper pipe fitting is connected with the copper pipeline in a welding way, and the melting temperature of the solder used for welding the copper pipe fitting and the copper pipeline is lower than that of the solder used for welding the copper pipe fitting and the stainless steel pipe fitting.

refrigerating system, including above-mentioned accumulator, refrigerating system includes evaporimeter and compressor, the accumulator includes tubular component 2 and second tubular component 2 ', the outlet pipeline of accumulator is tubular component 2, the inlet pipeline of accumulator is second tubular component 2', refrigerating system includes compressor and evaporimeter, tubular component with the import intercommunication setting of compressor, the second tubular component with the evaporimeter intercommunication sets up.

The manufacturing method of the pipe fitting connecting structure comprises an aluminum pipe fitting, a stainless steel pipe fitting and a copper pipe fitting, and comprises the following steps:

forming convex parts at the joint parts of stainless steel pipes and copper pipes, wherein the convex parts are in interference fit or abut against the joint parts of other pipes;

The manufacturing method of the pipe connecting structure further comprises the following steps, wherein steps in the steps S1, S2, S3 and S4 can be selected to be performed:

s1, machining the outer walls of joint parts of the stainless steel pipe fitting to form convex parts, assembling the stainless steel pipe fitting and the copper pipe fitting to enable at least part of the convex parts to be in interference fit with or abut against the inner wall of the copper joint part, placing the assembled steel pipe fitting, the copper pipe fitting and a th welding flux before melting into furnace welding equipment, wherein the melting temperature of a th welding flux during welding is higher than 980 ℃;

s2, machining the outer wall of the joint part of the copper pipe fitting to form a convex part, assembling the stainless steel pipe fitting and the copper pipe fitting to enable at least part of the convex part to be in interference fit with or abut against the inner walls of joint parts of the stainless steel pipe fitting, placing the assembled steel pipe fitting, the copper pipe fitting and a th welding flux before melting into furnace welding equipment, wherein the melting temperature of a th welding flux during welding is higher than 980 ℃;

s3, machining and forming convex parts on the inner walls of joint parts of the stainless steel pipe fitting, assembling the stainless steel pipe fitting and the copper pipe fitting to enable at least part of the convex parts to be in interference fit with or abut against the outer wall of the copper joint part, placing the assembled steel pipe fitting, the copper pipe fitting and a th welding flux before melting into furnace welding equipment, wherein the melting temperature of a th welding flux during welding is higher than 980 ℃;

s4, machining and forming a convex part on the inner wall of the joint part of the copper pipe fitting, assembling the stainless steel pipe fitting and the copper pipe fitting to enable at least part of the convex part to be in interference fit with or abut against the outer walls of joint parts of the stainless steel pipe fitting, placing the assembled steel pipe fitting, the copper pipe fitting and the th welding flux before melting into furnace welding equipment, wherein the melting temperature of the th welding flux during welding is higher than 980 ℃, and after welding through the furnace welding equipment, melting the th welding flux to form a th welding flux, wherein the th welding flux is at least located between the outer wall of the joint part of the stainless steel pipe fitting and the inner wall of the joint part of the copper pipe fitting.

The manufacturing method of the pipe fitting connection structure further comprises the following steps, wherein of the steps T1, T2, T3 and T4 can be selected for carrying out

T1, machining convex parts on the outer walls of the other joint parts of the stainless steel pipe, assembling the joint part of an aluminum pipe and the other joint part of the stainless steel pipe in the assembly formed by welding the stainless steel pipe and the copper pipe so that at least part of the convex parts is in interference fit with or abutted against the inner wall of the aluminum pipe, placing the assembled aluminum pipe, the assembly formed by welding the stainless steel pipe and the copper pipe and a second welding flux before melting into furnace welding equipment, wherein the welding temperature during welding is higher than 580 ℃;

t2, machining a convex part on the outer wall of the joint part of the aluminum pipe fitting, and assembling the joint part of the aluminum pipe fitting and the other joint part of the stainless steel pipe fitting in the assembly formed by welding the stainless steel pipe fitting and the copper pipe fitting so that at least part of the convex part is in interference fit with or abutted against the inner wall of the other joint part of the stainless steel pipe fitting;

t3, machining and forming convex parts on the inner walls of the other joint parts of the stainless steel pipe, and assembling the joint part of an aluminum pipe and the other joint part of the stainless steel pipe in the assembly formed by welding the stainless steel pipe and the copper pipe so that at least part of the convex parts are in interference fit with or abut against the outer wall of the aluminum pipe;

t4, machining a convex part on the inner wall of the joint part of the aluminum pipe fitting, assembling the joint part of the aluminum pipe fitting and the other joint part of the stainless steel pipe fitting in the assembly after the stainless steel pipe fitting and the copper pipe fitting are welded so that at least part of the convex part is in interference fit with or abutted against the outer wall of the other joint part of the stainless steel pipe fitting, placing the assembled aluminum pipe fitting, the assembly after the stainless steel pipe fitting and the copper pipe fitting are welded and a second welding flux before melting in furnace welding equipment, wherein the melting temperature of the second welding flux during welding is higher than 580 ℃, and after the assembly is welded by the furnace welding equipment, the second welding flux is melted to form a second welding seam which is at least positioned between the inner walls of the joint parts of the aluminum pipe fitting and between the outer walls of the other joint parts of the stainless steel pipe fitting.

A method for manufacturing a pipe connection structure, wherein the pipe connection comprises an aluminum pipe and a stainless steel pipe, and the method for manufacturing the pipe connection comprises the following steps:

the joint parts of pipes in the aluminum pipe fitting and the stainless steel pipe fitting are formed with convex parts which are in interference fit or abut against the joint parts of other pipes, the joint parts of the stainless steel pipe fitting and the joint parts of the copper pipe fitting are welded, and the melting temperature of the second welding flux during welding is greater than 580 ℃.

The manufacturing method of the pipe fitting connecting structure further comprises the following steps, wherein of the steps Q1, Q2, Q3 and Q4 can be selected for carrying out

Q1, machining the outer walls of joints of the stainless steel pipe to form convex parts, assembling the stainless steel pipe and the aluminum pipe so that at least part of the convex parts are in interference fit with or abut against the inner wall of the joint of the aluminum pipe, placing the assembled stainless steel pipe, the aluminum pipe and a second welding flux before melting into furnace welding equipment, welding the stainless steel pipe, the aluminum pipe and the second welding flux through the furnace welding equipment, melting the second welding flux to form a second welding flux, forming at least part of the second welding flux between the outer wall of the street head part of the steel pipe and the inner wall of the aluminum pipe joint, and enabling the second welding flux after melting not to enter the lumens of the joints of the stainless steel pipe through joints of the stainless steel pipe;

placing the assembled stainless steel pipe fitting, the aluminum pipe fitting and a second welding flux before melting into furnace welding equipment, melting the second welding flux to form a second welding flux after welding through the furnace welding equipment, forming at least part of second welding flux between the inner wall of the joint part of the steel pipe fitting and the outer wall of the joint part, and enabling the melted second welding flux not to enter tube cavities of joint parts of the aluminum pipe fitting through the joint part of the aluminum pipe fitting;

q3 machining convex parts on the inner walls of joints of the stainless steel pipe, assembling the stainless steel pipe and the aluminum pipe so that at least part of the convex parts are in interference fit with or abut against the outer wall of the joints of the aluminum pipe, placing the assembled stainless steel pipe, the aluminum pipe and a second welding flux before melting in furnace welding equipment, melting the second welding flux to form a second welding flux after welding by the furnace welding equipment, forming at least part of the second welding flux between the inner wall of the joints of the steel pipe and the outer wall of the aluminum pipe joints, and enabling the second welding flux after melting not to enter the tube cavities of joints of the aluminum pipe through the joints of the aluminum pipe;

q4, machining a convex part on the inner wall of the joint part of the aluminum pipe fitting, assembling the stainless steel pipe fitting and the aluminum pipe fitting, and placing the assembled stainless steel pipe fitting, the aluminum pipe fitting and a second welding flux before melting into a furnace welding device, wherein after the stainless steel pipe fitting, the aluminum pipe fitting and the second welding flux are welded by the furnace welding device, the second welding flux is melted to form a second welding flux, at least part of the second welding flux is formed between the outer wall of the joint part of the steel pipe fitting and the inner wall of the joint part, and the second welding flux after melting can not enter the tube cavities of the joint parts of the stainless steel pipe fitting through joint parts of the stainless steel pipe fitting.

It should be noted that the above-mentioned embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail by referring to the above-mentioned embodiments, it should be understood by those skilled in the art that the modifications or equivalent substitutions can be made by those skilled in the art, and should be covered by the technical solutions and modifications without departing from the spirit and scope of the present invention.

Claims

1, pipe fitting connection structures, which comprise an aluminum pipe fitting, a stainless steel pipe fitting and a copper pipe fitting, wherein the aluminum pipe fitting comprises an aluminum pipe joint part, the stainless steel pipe fitting comprises a stainless steel pipe fitting joint part and a stainless steel pipe fitting second joint part, the copper pipe fitting comprises a copper joint part, the stainless steel pipe fitting second joint part is welded with the copper joint part, a welded assembly of the stainless steel pipe fitting and the copper pipe fitting and the aluminum pipe joint part are welded, the aluminum pipe joint part is not in contact with the copper joint part, of the stainless steel pipe fitting second joint part and the copper joint part are defined as an pipe fitting joint part, of the stainless steel pipe fitting second joint part and the copper joint part are defined as a second pipe fitting joint part, and the second pipe fitting joint part is at least partially located in the pipe fitting joint part;

2. The pipe connection structure according to claim 1, wherein a th gap is formed between an inner wall of the th pipe joint portion and an outer wall of the second pipe joint portion before welding, the pipe connection structure has th solder, the th gap becomes a th solder filling portion when the th pipe joint portion and the second pipe joint portion are welded, the pipe connection structure includes a second solder, the second solder is defined as a solder for welding the stainless steel pipe and the aluminum pipe, and a melting temperature of the th solder is higher than a melting temperature of the second solder.

3. The pipe coupling according to claim 1 or 2, wherein the stainless steel pipe fitting is located within the aluminum pipe fitting, the stainless steel pipe fitting outer wall has a plurality of protrusions, at least a portion of the protrusions interfering with or abutting the inner wall of the aluminum pipe fitting;

or the joint part of the stainless steel pipe fitting is positioned in the aluminum pipe joint part, the inner wall of the aluminum pipe joint part is provided with a plurality of convex parts, and at least part of the convex parts is interfered with or abutted against the outer wall of the joint part of the stainless steel pipe fitting;

or the aluminum pipe joint part is positioned in the th joint part of the stainless steel pipe fitting, the outer wall of the aluminum pipe joint part is provided with a plurality of convex parts, and at least part of the convex parts is interfered with or abutted against the inner wall of the th joint part of the stainless steel pipe fitting;

or the aluminum pipe joint part is positioned in the th joint part of the stainless steel pipe fitting, the inner wall of the th joint part of the stainless steel pipe fitting is provided with a plurality of convex parts, and at least part of the convex parts are in interference fit with or abut against the outer wall of the aluminum pipe joint part;

or the aluminum pipe joint part is partially positioned in the th joint part of the steel pipe fitting, the inner wall of the th joint part of the steel pipe fitting is provided with a plurality of convex parts, at least part of the convex parts is in interference fit with or abutted against the outer wall of the aluminum pipe joint part, the pipe fitting connecting structure is provided with a solder layer, the solder layer is positioned on the inner side of the th joint part of the steel pipe fitting and is positioned on the outer side of the aluminum pipe joint part, the inner wall of the steel pipe fitting joint part and the outer wall of the aluminum pipe joint part are fixed through the solder layer, and the inner wall of the aluminum pipe joint part is used as the inner wall of the channel of the pipe fitting connecting structure;

or, the aluminum pipe joint part is partially positioned in the th joint part of the steel pipe fitting, the outer wall of the aluminum pipe joint part has a plurality of convex parts, at least part of the convex parts is in interference fit with or abutted against the outer wall of the th joint part of the steel pipe fitting, the pipe fitting connecting structure has a solder layer positioned on the inner side of the th joint part of the steel pipe fitting, the solder layer is positioned on the outer side of the aluminum pipe joint part, the inner wall of the th joint part of the steel pipe fitting and the outer wall of the aluminum pipe joint part are fixed through the solder layer, and the inner wall of the th joint part of the steel pipe fitting is used as the inner wall of the passage of the pipe fitting connecting structure;

or the th joint part of the steel pipe fitting is partially positioned in an aluminum pipe joint, the outer wall of the steel pipe fitting joint has a plurality of convex parts, at least part of the convex parts is in interference fit with or abutted against the inner wall of the aluminum pipe joint, the pipe fitting connection structure has a solder layer, the solder layer is positioned on the inner side of the aluminum pipe joint and is positioned on the outer side of the th joint part of the steel pipe fitting, the outer wall of the steel pipe fitting joint and the inner wall of the aluminum pipe joint part are fixed through the solder layer, and the inner wall of the steel pipe fitting joint part is used as the inner wall of the channel of the pipe fitting connection structure;

or, the steel pipe fitting joint part is located in an aluminum pipe joint part, the inner wall of the aluminum pipe joint part has a plurality of convex parts, at least part of the convex parts is in interference fit with or abuts against the inner wall of the th joint part of the steel pipe fitting, the pipe fitting connection structure has a solder layer located on the inner side of the aluminum pipe joint part, the solder layer is located on the outer side of the th joint part of the steel pipe fitting, the outer wall of the th joint part of the steel pipe fitting and the inner wall of the aluminum pipe joint part are fixed by the solder layer, and the inner wall of the th joint part of the steel pipe fitting serves as the inner wall of the passage of the pipe fitting connection structure.

4. A pipe fitting connection structure as claimed in claim 3, wherein said aluminum pipe fitting portion has a throat portion whose outer wall has a plurality of said protrusions and a body portion, at least a part of said body portion being disposed in a gap with an inner wall of an th fitting portion of said stainless steel pipe fitting, a second gap being provided between the outer wall of said throat portion and the inner wall of an th fitting portion of said stainless steel pipe fitting, said pipe fitting connection structure comprising a second welding material which forms at least a part of a second weld at said second gap;

alternatively, the th joint part of the stainless steel pipe fitting has a throat part, an outer wall of the throat part has a plurality of the protrusions and a body part, at least part of the body part and at least part of the body part are arranged with a gap to an inner wall of the aluminum pipe joint part, a second gap is provided between the outer wall of the throat part and the inner wall of the aluminum pipe joint part, and the pipe fitting connecting structure includes a second solder which forms at least part of a second weld at the second gap.

5. A pipe connecting structure as claimed in claim 4, wherein said aluminum pipe joint portion has a throat portion, said aluminum pipe joint portion includes an aluminum pipe joint portion end portion and an aluminum pipe joint portion fitting tail portion, said aluminum pipe joint portion end portion is provided extending continuously to said aluminum pipe joint portion fitting tail portion in an axial direction of said aluminum pipe joint portion, an inner wall of said aluminum pipe joint portion forms a tube cavity of said aluminum pipe joint portion, said tube cavity of said aluminum pipe joint portion is a cavity;

or the stainless steel pipe joint part is provided with a necking part, the stainless steel pipe joint part comprises a stainless steel pipe joint part end part and a stainless steel pipe joint part matching tail part, the stainless steel pipe joint part end part and the stainless steel pipe joint part matching tail part are continuously arranged in an extending mode along the axial direction of the stainless steel pipe joint part, the inner wall of the stainless steel pipe joint part forms a tube cavity of the stainless steel pipe joint part, and the tube cavity of the stainless steel pipe joint part is a cavity.

6. The tubular connection of any one of claims 2-5 and , wherein the tubular component is a stainless steel tubular component, at least a portion of the copper joint portion is located within the stainless steel tubular second joint portion, the copper joint portion outer wall has a plurality of grooves and a plurality of protrusions, the grooves are recessed toward a center of the copper joint portion relative to the protrusions in a radial direction of the copper joint portion, the protrusions are at least partially in interference or abutment with an inner wall of the stainless steel tubular second joint portion, a th clearance is provided between the outer wall of the copper joint portion and the inner wall of the stainless steel tubular second joint portion, at least a portion of the grooves of the stainless steel tubular component extend axially along the copper joint portion, the copper joint portion is necked-down, the copper joint portion angle is 5 ℃ or less, the stainless steel tubular component includes a stainless steel inner stepped portion and a stainless steel main portion, and the stainless steel inner stepped portion is disposed opposite to the stainless steel stepped portion;

or the th pipe fitting is a stainless steel pipe fitting, at least part of the copper joint part extends into the second joint part of the stainless steel pipe fitting, the outer wall of the copper joint part is provided with a plurality of grooves and a plurality of protrusions, the grooves are recessed towards the center of the copper joint part relative to the protrusions along the radial direction of the copper joint part, at least part of the positions of the protrusions and the inner wall of the second joint part of the stainless steel pipe fitting are in interference or abutting joint, a th gap is formed between the outer wall of the copper joint part and the inner wall of the second joint part of the stainless steel pipe fitting, at least part of the grooves extends along the axial direction of the copper joint part, the necking of the copper joint part is arranged, the necking angle of the copper joint part is less than or equal to 5 ℃, the matching length of the copper joint part and the second joint part of the stainless steel pipe fitting is along the axial direction of the copper joint part, and the length of the grooves is greater than the matching length of the copper joint part and the second joint part of the stainless steel pipe fitting.

7. The tubular connection of any one of claims 2-5 and , wherein the tubular component is the stainless steel tubular component, at least a portion of the copper joint is located within the stainless steel tubular second joint, the inner wall of the stainless steel tubular second joint has a plurality of grooves and a plurality of protrusions, the grooves are recessed relative to the protrusions away from the center of the stainless steel tubular second joint in a radial direction of the stainless steel tubular second joint, a partial positional interference or abutment exists between an outer wall of the copper joint and the inner wall of the stainless steel tubular second joint, a gap exists between the outer wall of the copper joint and the inner wall of the stainless steel tubular second joint, and at least a portion of the grooves extends in an axial direction of the stainless steel tubular second joint;

or the th pipe fitting is the copper pipe fitting, the inner wall of the copper joint part is provided with a plurality of grooves and a plurality of bulges, the grooves are sunken relative to the bulges away from the center of the copper joint part along the radial direction of the copper joint part, partial position interference or abutting is formed between the inner wall of the copper joint part and the outer wall of the second joint part of the stainless steel pipe fitting, a th gap is formed between the inner wall of the copper joint part and the outer wall of the second joint part of the stainless steel pipe fitting, and at least part of the grooves of the stainless steel pipe fitting is arranged along the axial direction of the copper joint part in an extending manner;

or, the th pipe fitting is the copper pipe fitting, the outer wall of the stainless steel pipe fitting second joint part has a plurality of grooves and a plurality of the protrusions, the grooves are recessed toward the center of the stainless steel pipe fitting second joint part relative to the protrusions along the radial direction of the stainless steel pipe fitting second joint part, a partial position interference or abutment is formed between the inner wall of the copper joint part and the outer wall of the stainless steel pipe fitting second joint part, a th gap is formed between the inner wall of the copper joint part and the outer wall of the stainless steel pipe fitting second joint part, and the grooves extend along the axial direction of the stainless steel pipe fitting second joint part.

8. A tubular connecting structure according to claim 6 or 7, characterized in that the projections or grooves are formed by machining, and the depth of the grooves is between 0.05 and 0.15mm, or the height of the projections is between 0.05 and 0.15 mm; the peripheral surface where the grooves/bulges are located is divided by the grooves/bulges, the intervals between the adjacent bulges are equal, or at least part of the intervals between the adjacent grooves/bulges are equal;

the convex part is formed by machining, the circumferential direction of the convex part is equally divided into the circumferential surface where the convex part is located, and the height of the convex part is 0.05-0.2mm, or the distance of the second gap is 0.05-0.2 mm.

9. The tubular connecting structure according to any one of claims 4 to 8 and , wherein the throat portion comprises a throat guide portion having an equivalent diameter equal to or smaller than that of the body portion, at least a part of the throat guide portion being provided at a gap from the th joint portion of the stainless steel tubular member or the aluminum pipe joint portion.

10. A tubular connection according to any one of wherein the stainless steel joint portion has a mating tubular section and the throat portion, the mating tubular section being further from the end of the stainless steel joint portion than the throat portion, at least a portion of the mating tubular section being disposed in clearance fit with the aluminum tubular joint portion;

alternatively, the aluminum pipe joint portion has a fitting pipe section and the throat portion, the fitting pipe section being farther from an end of the aluminum pipe joint portion than the throat portion, at least a portion of the fitting pipe section being disposed in clearance fit with the th joint portion of stainless steel.

11. The pipe connection structure according to , wherein the aluminum pipe joint or the stainless steel pipe joint, the stainless steel pipe second joint or the copper joint has a protrusion length in an axial direction of the aluminum pipe joint or the stainless steel pipe joint, the aluminum pipe joint has a length of protrusion into the stainless steel pipe joint or the stainless steel pipe joint has a length of protrusion into the aluminum pipe joint, and the stainless steel pipe second joint has a length of protrusion into the copper joint or the copper joint has a length of protrusion into the stainless steel pipe second joint in an axial direction of the stainless steel pipe second joint or the copper joint;

the extending length of the aluminum pipe joint part or the stainless steel pipe fitting is more than or equal to three times of the wall thickness of the th joint part of the aluminum pipe joint part or the stainless steel pipe fitting, and the extending length of the second joint part or the copper joint part of the stainless steel pipe fitting is more than or equal to three times of the wall thickness of the second joint part or the copper joint part of the stainless steel pipe fitting;

and/or the extending length of the aluminum pipe joint part or the stainless steel pipe fitting is more than or equal to sixty percent of the equivalent outer diameter of the th joint part of the aluminum pipe joint part or the stainless steel pipe fitting, and the extending length of the second joint part or the copper joint part of the stainless steel pipe fitting is more than or equal to sixty percent of the equivalent diameter of the second joint part or the copper joint part of the stainless steel pipe fitting.

12. A pipe connecting structure as claimed in wherein the stainless steel joint is furnace welded to the aluminum pipe joint and the stainless steel second joint is furnace welded to the copper joint, and the melting temperature of the solder for welding the stainless steel pipe to the aluminum pipe is lower than the melting temperature of the solder for furnace welding the stainless steel pipe to the copper pipe;

or, the th joint of stainless steel with the welding setting is welded to aluminum pipe joint portion stove, stainless steel second joint with the welding setting is welded to copper joint portion stove, the th solder is the bronze solder, the second solder is the aluminium solder, the melting temperature of th solder is greater than 980 ℃, the melting temperature of second solder is greater than 580 ℃, the melting temperature of second solder is less than the melting temperature of aluminium pipe fitting, the th welding seam is the copper welding seam, the second welding seam is the aluminium welding seam.

13, reservoir comprising a can and a tube connection, the tube connection being the tube connection of any of claims 1-12 through , the can being aluminum, the can being disposed integrally or welded to the aluminum tube ;

alternatively, the tube connection structure is the tube connection structure of any of claims 1-12, the can is copper, and the can is disposed integrally or welded with the copper tube .

14, a refrigeration system comprising a component, said component comprising a tube connection structure as claimed in any of claims 1-12 and , said refrigeration system comprising a copper tube connected to said copper tube, said copper tube being soldered to said copper tube using a solder having a melting temperature lower than that of said th solder.

15, A manufacturing method of a pipe connection structure including an aluminum pipe, a stainless steel pipe and a copper pipe, the manufacturing method of the pipe connection comprising the steps of:

16. The method of manufacturing a pipe fitting connection structure according to claim 15, wherein projections are machined on outer walls of joint portions of the stainless steel pipe fitting, the stainless steel pipe fitting and the copper pipe fitting are assembled such that at least a part of the projections is in interference fit with or abuts against an inner wall of the copper joint portion, the assembled steel pipe fitting, the copper pipe fitting and solder before melting are placed in a furnace welding device, a melting temperature of solder during welding is higher than 980 degrees centigrade, the solder after welding by the furnace welding device is melted to form a th weld, and the th weld is located at least between the outer wall of the joint portion of the stainless steel pipe fitting and the inner wall of the joint portion of the copper pipe fitting;

or machining a bulge on the outer wall of the joint part of the copper pipe fitting, assembling the stainless steel pipe fitting and the copper pipe fitting, so that at least part of the bulge is in interference fit or abutted with the inner walls of joint parts of the stainless steel pipe fitting, placing the assembled steel pipe fitting, the copper pipe fitting and the th welding flux before melting into furnace welding equipment, wherein the melting temperature of the th welding flux is 980 ℃;

placing the assembled steel pipe and copper pipe and the th welding flux before melting into furnace welding equipment, wherein the melting temperature of the th welding flux is 980 ℃ during welding;

or machining a bulge on the inner wall of the joint part of the copper pipe fitting, assembling the stainless steel pipe fitting and the copper pipe fitting so that at least part of the bulge is in interference fit with or abuts against the outer walls of joint parts of the stainless steel pipe fitting, placing the assembled steel pipe fitting, the copper pipe fitting and th welding flux before melting into furnace welding equipment, wherein the melting temperature of the th welding flux during welding is 980 ℃, and after welding through the furnace welding equipment, melting the th welding flux to form a th welding flux, wherein the th welding flux is at least positioned between the outer wall of the joint part of the stainless steel pipe fitting and the inner wall of the joint part of the copper pipe fitting.

17. The manufacturing method of the pipe fitting connecting structure according to claim 16, wherein the outer walls of joint parts of the stainless steel pipe fitting are machined to form convex parts, and the joint part of the aluminum pipe fitting and joint parts of the stainless steel pipe fitting in the assembly of the stainless steel pipe fitting and the copper pipe fitting after welding are assembled, so that at least part of the convex parts are in interference fit with or abut against the inner wall of the aluminum pipe fitting;

the assembled aluminum pipe fitting, the assembly formed by welding the stainless steel pipe fitting and the copper pipe fitting and a second welding flux before melting are placed in furnace welding equipment, the melting temperature of the second welding flux during welding is higher than 580 ℃, and the melting temperature of the second welding flux is lower than the melting temperature of the aluminum pipe fitting;

the method comprises the steps of welding a stainless steel pipe fitting and a copper pipe fitting, wherein the inner walls of joint parts of the stainless steel pipe fitting are machined to form convex parts, assembling the joint part of an aluminum pipe fitting and the other joint part of the stainless steel pipe fitting in an assembly formed by welding the stainless steel pipe fitting and the copper pipe fitting so that at least part of the convex parts is in interference fit with or abutted against the outer wall of the aluminum pipe fitting, placing the assembled aluminum pipe fitting, the assembly formed by welding the stainless steel pipe fitting and the copper pipe fitting and a second welding flux before melting in furnace welding equipment, wherein the melting temperature of the second welding flux is 580 ℃ and is lower than that of the aluminum pipe fitting;

or machining a convex part on the inner wall of the joint part of the aluminum pipe fitting, assembling the joint part of the aluminum pipe fitting and another joint part of the stainless steel pipe fitting in the assembly formed by welding the stainless steel pipe fitting and the copper pipe fitting so that at least part of the convex part is in interference fit with or abutted against the outer wall of another joint part of the stainless steel pipe fitting, placing the assembled aluminum pipe fitting, the assembly formed by welding the stainless steel pipe fitting and the copper pipe fitting and a second welding flux before melting in furnace welding equipment, wherein the melting temperature of the second welding flux during welding is 580 ℃ and is less than that of the aluminum pipe fitting, and after welding through the furnace welding equipment, the second welding flux is melted to form a second welding seam which is at least positioned between the inner walls of the joint parts of the aluminum pipe fitting and the outer walls of the other joint parts of the stainless steel pipe fitting.

18, method for manufacturing pipe connection structure, the pipe connection comprises aluminum pipe and stainless steel pipe, the method for manufacturing the pipe connection comprises the following steps:

19. The method of manufacturing a pipe fitting connection structure according to claim 18, wherein the outer walls of joint portions of the stainless steel pipe fitting are machined to form convex portions, the stainless steel pipe fitting is assembled with the aluminum pipe fitting such that at least a part of the convex portions are in interference fit with or abut against the inner walls of the joint portions of the aluminum pipe fitting, the assembled stainless steel pipe fitting, aluminum pipe fitting and second solder before melting are placed in a furnace welding device, and after welding by the furnace welding device, the second solder is melted to form a second weld, at least a part of the second weld is formed between the outer wall of the street head portion of the steel pipe fitting and the inner wall of the aluminum pipe joint portion, and the melted second solder cannot penetrate through the wall portions of joint portions of the stainless steel pipe fitting into the lumens of joint portions of the stainless steel pipe fitting;

placing the assembled stainless steel pipe fitting, the aluminum pipe fitting and a second welding flux before melting into furnace welding equipment, welding by the furnace welding equipment, melting the second welding flux to form a second welding flux, forming at least part of second welding flux between the inner wall of the joint part of the steel pipe fitting and the outer wall of the aluminum pipe joint part, wherein the melted second welding flux cannot penetrate through the wall part of the joint part of the aluminum pipe fitting to enter the lumens of joint parts of the aluminum pipe fitting;

placing the assembled stainless steel pipe, the aluminum pipe and a second welding flux before melting into furnace welding equipment, melting the second welding flux to form a second welding flux after welding through the furnace welding equipment, forming at least part of second welding flux between the inner wall of the joint part of the steel pipe and the outer wall of the aluminum pipe joint part, wherein the melted second welding flux cannot penetrate through the wall part of the joint part of the aluminum pipe to enter the tube cavities of joint parts of the aluminum pipe;

and placing the assembled stainless steel pipe fitting, the aluminum pipe fitting and second welding flux before melting into furnace welding equipment, welding by the furnace welding equipment, melting the second welding flux to form a second welding flux, forming at least part of second welding flux between the outer wall of the joint part of the steel pipe fitting and the inner wall of the aluminum pipe joint part, wherein the melted second welding flux cannot penetrate through the wall parts of joint parts of the stainless steel pipe fitting and enter the tube cavities of joint parts of the stainless steel pipe fitting.