CN220134868U - Rectangular tube liner tube connecting structure and refrigeration assembly - Google Patents

Abstract

The utility model provides a rectangular tube liner tube connecting structure and a refrigeration assembly. Circular connecting holes are formed in the wall of the rectangular pipe. The flanging hole lining plate comprises a base and a flanging part connected to the base, the base is bonded and welded on the inner wall of the rectangular pipe, an assembly hole coaxial with the connecting hole is formed in the flanging part, and the aperture D of the assembly hole meets the following requirements:wherein L is the side length of the rectangular pipe where the connecting hole is located; the flanging part penetrates through the connecting hole of the rectangular pipe and extends to the outside of the rectangular pipe, and the external pipe fitting is welded on the flanging part; alternatively, the flange portion momentThe inside extension of pipe, outside pipe fitting weld in connecting hole and turn-ups portion.

Description

Rectangular tube liner tube connecting structure and refrigeration assembly

Technical Field

The utility model relates to the field of accessories of refrigeration systems, in particular to a rectangular pipe liner connecting structure and a refrigeration assembly.

Background

In the pipeline of the refrigeration system, the pipe fitting and the pipe fitting are connected in an intersecting way, one is that intersecting line holes are formed on the pipe fitting body to carry out intersecting line welding with the external pipe fitting; the connection mode has large welding limitation, and only self-fluxing welding can be adopted generally, but brazing cannot be adopted. Another way is to punch and weld on the pipe body; typically, the wall thickness of the pipe is thin, especially the wall of the stainless steel pipe is thinner (typically 0.5 mm-2 mm), and the pipe wall is directly punched and welded, so that the welding depth is obviously difficult to meet the requirement. For this purpose, a connecting hole with a certain assembly length needs to be led out on the pipe body through punching flanging to improve the welding depth. For circular pipe fittings, the curved peripheral wall enables the material to migrate well to the connecting hole to form the flanging part during punching flanging. However, the curved peripheral wall determines that the end face of the turned-up part led out by the curved peripheral wall is also in a curved structure (namely, the end face has a height difference), and the curved turned-up end face can cause the problem of suspension of part of solder and flow welding during brazing. Therefore, the inventor proposes to replace the circular pipe with a rectangular pipe so that the plane of the connecting hole or the end face of the flanging part is approximately a plane, thereby solving the flow soldering problem caused by the suspension of the solder.

For rectangular pipes, when the pipe diameter of the connected external pipe fitting is large, and the edge of the connecting hole is too close to the corner area between the adjacent side walls on the rectangular pipe (for example, when the pipe diameter of the external pipe fitting is close to the side length of the rectangular pipe where the connecting hole is located), no redundant material can be migrated on the pipe wall where the connecting hole is located, and only the material on the adjacent surface can be pulled during flanging. Migration of adjacent surface materials can cause serious deformation of the rectangular pipe shape and the connecting holes; specifically, the connecting hole changes from a circular shape to an elliptical shape, for example, and is difficult to assemble. Furthermore, the corner area between the adjacent side walls also can cause obstruction to the migration of the adjacent surface materials, the migration of the materials is difficult, and the height of the flanging is difficult to meet the assembly depth requirement. For this reason, it has been proposed to line a rectangular tube with a plurality of stacked liners in sequence (limited by the stamping process, the hole depth of the single liner is difficult to meet the requirements), and to use the stacked liner hole depths to increase the welding depth. In the structure, the connecting strength between the adjacent lining plates is low, and the hidden danger of high multi-leakage rate of a welding line path exists; in addition, the superposition of a plurality of lining plates also has the problems of large plate consumption, high cost, heavy whole weight of the pipe fitting and the like.

Disclosure of Invention

The utility model provides a rectangular pipe liner connecting structure for overcoming the defects in the prior art.

In order to achieve the above object, the present utility model provides a rectangular tube liner tube connecting structure, which comprises a rectangular tube and a flanging hole liner plate. Circular connecting holes are formed in the wall of the rectangular pipe. The flanging hole lining plate comprises a base and a flanging part connected to the base, the base is bonded and welded on the inner wall of the rectangular pipe, an assembly hole coaxial with the connecting hole is formed in the flanging part, and the aperture D of the assembly hole meets the following requirements:wherein L is the side length of the rectangular pipe where the connecting hole is located; the flanging part penetrates through the connecting hole of the rectangular pipe and extends to the outside of the rectangular pipe, and the external pipe fitting is welded on the flanging part; or the flanging part extends to the inside of the rectangular pipe, and the external pipe fitting is welded to the connecting hole and the flanging part.

According to an embodiment of the present utility model, the base is a planar plate;

or, the base includes the body and is on a parallel with the at least connecting plate that bends in the rectangular pipe of rectangular pipe axial edge on the body approximately, and the mounting hole forms in the body and body laminating welding in the rectangular pipe inner wall at connecting hole place, and the connecting plate laminating welding is in the adjacent inner wall of rectangular pipe.

According to one embodiment of the utility model, the body and the connecting plate are in transitional connection through a corner area, a groove is formed on the outer wall of the corner area, and a base accommodating groove for accommodating solder is formed between the groove and the inner wall of the rectangular pipe.

According to one embodiment of the utility model, the base and the inner wall of the rectangular pipe are integrally welded and formed through brazing in a furnace;

or the connecting hole of the rectangular pipe is connected with the flanging part through self-melting or self-melting type wire adding welding, and the base is connected with the inner wall of the rectangular pipe through brazing welding in a furnace;

or the base and the inner wall of the rectangular pipe are connected by self-fluxing or self-fluxing type wire adding welding.

According to an embodiment of the utility model, the flanging part is in transitional connection with the base through an arc section, and a containing groove for fixing solder is formed between the outer wall of the arc section and the connecting hole of the rectangular pipe or between the outer wall of the arc section and the inner wall of the rectangular pipe.

On the other hand, the utility model also provides a refrigeration component which comprises the rectangular pipe liner connecting structure and is a three-way pipe fitting or a fluid dividing/collecting component.

According to one embodiment of the utility model, the refrigerating component is a fluid dividing/collecting component, the other wall of the rectangular pipe is provided with a plurality of branch pipe holes, the rectangular pipe liner connecting structure further comprises a branch pipe liner plate lined in the other wall of the rectangular pipe, the branch pipe liner plate is provided with a plurality of branch pipe liner holes, and a plurality of branch pipes of the fluid dividing/collecting component are respectively welded and connected with the coaxial branch pipe holes and the branch pipe liner holes; the manifold liner is of a lightweight construction to reduce the solder layer area between the manifold liner and the other wall of the rectangular tube.

According to one embodiment of the utility model, the branch pipe lining plate is provided with a light weight hole; and/or the edge of the branch liner is of a lightweight construction.

In summary, according to the rectangular pipe liner connecting structure provided by the utility model, the flanging part is not directly formed on the connecting hole of the rectangular pipe so as to meet the welding depth, but the flanging hole liner plate with the flanging part is additionally arranged so as to meet the welding requirement of an external pipe. The arrangement ensures that the flanging part for welding and inserting is formed without influencing the rectangular pipe, and the appearance of the rectangular pipe and the connecting hole on the pipe wall are not deformed; meanwhile, the size of the flanging part for welding is not limited by the shape of the rectangular tube and the migration amount of materials, the aperture and the height of the flanging part can be well met according to actual needs, and the flanging end face is neat and the flanging part can be molded in various modes. Further, the base on the flanging hole lining plate provides a foundation for the welded connection between the flanging part and the rectangular pipe, which meets the air tightness and pressure resistance. The setting of flanging hole welt provides long enough welding depth for the welding of outside pipe fitting when guaranteeing that the rectangular pipe is not out of shape, has solved the welding leakage, the poor scheduling welding problem of pressure resistance that the welding depth is short because of the turn-ups portion is difficult to process of connecting hole of rectangular pipe when outside pipe fitting pipe diameter is great effectively. In addition, compared with the structure of the prior lining with a plurality of lining plates, the utility model can realize the connection of external pipe fittings by adopting the single part of the flanging hole lining plate, thereby not only having high connection strength, good welding air tightness, but also saving more material and materials and having lighter weight.

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.

Drawings

Fig. 1 is a schematic view of a rectangular tube liner connecting structure according to an embodiment of the present utility model.

Fig. 2 shows an enlarged schematic view at a in fig. 1.

Fig. 3 is a schematic view of the rectangular tube of fig. 1.

Fig. 4 is a schematic structural view of the burring liner of fig. 1.

Fig. 5 is a schematic view of the structure of fig. 4 at another view angle.

Fig. 6 is a schematic cross-sectional view of fig. 4.

Fig. 7 is a schematic structural diagram of a burring liner according to another embodiment of the present utility model.

Fig. 8 is a schematic structural diagram of a refrigeration unit according to a first embodiment of the present utility model.

Fig. 8A is a schematic view showing a structure of the burring liner plate and the rectangular tube in fig. 8 in a separated state.

Fig. 9 is an enlarged schematic view of fig. 8 at B.

Fig. 10 is a schematic view showing the structure of the hole of the manifold substrate in fig. 8.

Fig. 11 is a schematic view showing the structure of a manifold liner according to another embodiment of the present utility model.

Fig. 12 is a schematic structural diagram of a refrigeration assembly according to another embodiment of the present utility model.

Fig. 13 is a schematic view of a rectangular tube liner connecting structure according to a second embodiment of the present utility model.

Fig. 14 is an enlarged schematic view of fig. 13 at C.

Fig. 15 is a schematic view showing the structure of the burring liner of fig. 13.

Detailed Description

Example 1

For the external pipe fitting with the pipe diameter exceeding half of the side length of the rectangular pipe, the rectangular pipe is difficult to directly form a flanging part with the welding depth meeting the requirement under the condition that the pipe body and the connecting hole are not deformed. In view of this, the present embodiment provides a rectangular tube liner tube connection structure that is excellent in welding performance without depending on the rectangular tube itself in the burring formation.

As shown in fig. 1 to 6, the rectangular tube liner tube connecting structure provided in the present embodiment includes a rectangular tube 1 and a burring liner plate 2. The wall of the rectangular tube 1 is provided with a circular connecting hole 101. The flanging hole liner plate 2 comprises a base 21 and a flanging part 22 connected to the base 21, wherein the base 21 is bonded and welded to the inner wall of the rectangular pipe 1, an assembly hole 220 coaxial with the connecting hole is formed in the flanging part 22, and the aperture D of the assembly hole 220 meets the following conditions: where L is the rectangular tube side length where the connection hole 101 is located. In this embodiment, the flange portion 22 is inserted through the rectangular tube connecting hole 101 and extends to the outside of the rectangular tube 1, and the external tube member can be welded to the flange portion 22 by an inner sleeve or an outer sleeve. However, the present utility model is not limited in any way thereto.

The rectangular tube 1 according to the present utility model is a rectangular tube in a broad sense, and includes a tube having a substantially rectangular cross section and a substantially square cross section (the tube is also a square tube). Although the present embodiment is described by taking an example in which the cross section is rectangular. However, the present utility model is not limited thereto, and in other embodiments, the rectangular tube may be a tube with a cross section close to square.

For a tube having a rectangular cross section, the sides of the rectangular tube include a long side and a short side. In the present embodiment, as shown in fig. 1, the connection hole 101 is formed on the long side of the rectangular tube, so that the length L refers to the long side length of the rectangular tube, and preferably,wherein R is the radius of the outer arc of the rectangular tube. However, the present utility model is not limited in any way thereto. In other embodiments, the connecting holes may be formed on the short sides of the rectangular tube, as desired.

In the rectangular pipe connecting structure provided in the present embodiment, the burring 22 satisfying the welding depth of the external pipe fitting is not directly formed in the rectangular pipe 1, but is formed in the burring liner 2. The split type structure of the flanging hole liner plate 2 and the rectangular pipe 1 enables the flanging hole liner plate 2 to be independently processed and molded and then assembled and welded on the inner wall of the rectangular pipe 1. In other words, the shaping of the burring part 22 on the burring liner 2 is no longer limited to the rectangular tube 1, nor does it affect the shape of the rectangular tube 1 and the connecting hole 101. The flanging part 22 on the flanging hole liner plate 2 can be formed by adopting any one of a plurality of modes such as punching flanging, stretching or extrusion of the plate, so that the processing modes are various, different flanging hole apertures and flanging heights can be realized by selecting the size (such as wall thickness or area) of the plate, and the rectangular pipe requirements of different specifications can be well matched to form series products. In addition, the arrangement of the flanging part 22 also makes the embodiment only adopt a single flanging hole liner plate 2 to meet the requirement of welding depth, so that the welding depth is high, the welding seam path is less (only a welding seam path is formed between the base and the inner wall of the rectangular pipe), and the welding seam welding device has the advantages of less material consumption, low cost, light weight and the like.

The arrangement of the base 21 realizes the connection between the flanging hole liner plate 2 and the rectangular pipe 1; specifically, the base 21 attached to the inner wall of the rectangular tube 1 greatly increases the welding area between the two, so that the two have excellent air tightness and pressure resistance after welding. In addition, the base 22 can also support the wall of the rectangular tube 1 near the connection hole 101 to increase the strength of the tube body.

In this embodiment, the rectangular tube 1 and the flanging hole liner 2 are made of stainless steel materials, and the base 21 and the inner wall of the rectangular tube 1 are integrally welded and formed by brazing in a furnace. However, the utility model is not limited in any way to the materials of the rectangular tube and the flanging hole liner plate and the welding mode. In other embodiments, the rectangular tube and the flanging hole liner plate can also be made of copper materials; alternatively, the rectangular tube is made of stainless steel, and the flanging hole lining plate is made of copper. For the welding mode, in other embodiments, the connection hole of the rectangular tube and the flanging part are connected through self-melting or self-melting type wire adding welding, and the base and the inner wall of the rectangular tube are connected through brazing welding in a furnace. Or the base and the inner wall of the rectangular pipe are connected by self-fluxing or self-fluxing type wire adding welding. The equipment used for the braze welding in the furnace can be any one of a mesh belt type tunnel furnace, a vacuum braze welding furnace or a gas protection braze welding furnace. The self-fluxing welding can be any one of argon arc welding, laser welding, plasma welding and other modes; self-welding refers to the addition of welding wire at the same time as the self-welding described above.

In order to further improve the connection strength and the welding tightness between the flanging hole liner plate 2 and the rectangular tube 1, in the present embodiment, the base 21 includes a body 211 and at least one connecting plate 212 bent from an edge of the body 211 approximately parallel to the axial direction of the rectangular tube 1 into the rectangular tube 1, the assembly hole 220 is formed in the body 211 and the body 211 is welded to the inner wall 11 of the rectangular tube where the connecting hole 101 is located, and the connecting plate 212 is welded to the adjacent inner wall 12 of the rectangular tube 1. As shown in fig. 1, 2 and 4 to 6, the base 21 includes two connecting plates 212 symmetrically distributed on two sides of the main body 211, and the two connecting plates 212 are respectively bonded and welded to two adjacent inner walls 12 of the inner wall 11 where the connecting hole 101 is located. After welding, a longitudinal weld seam is formed between the connecting plate 212 and the corresponding adjacent inner wall 12, which is substantially perpendicular to the body 211, and a transverse weld seam is formed between the body 211 and the rectangular tube inner wall 11 where the connecting hole 101 is located. From the inside of rectangular pipe 1 to turn-ups portion 22, the joint strength between turn-ups hole welt 2 and rectangular pipe 1 has not only been greatly improved to the distribution in proper order of vertical welding seam and horizontal welding seam and just has one to seal in two welding seams can guarantee the gas tightness, has effectively reduced the welding leakage rate. However, the present utility model is not limited in any way thereto. In other embodiments, as shown in fig. 7, the base 21 may be a planar plate; i.e. without a connection plate. Alternatively, in other embodiments, a connection plate may be disposed on only one side of the body.

As shown in fig. 2, the flanging part 22 is in transitional connection with the main body 211 of the base through a circular arc section 23, and a containing groove 230 for fixing solder is formed between the outer wall of the circular arc section 23 and the connecting hole 101 of the rectangular pipe. During the furnace brazing, the solder in the receiving groove 230 melts and gradually infiltrates into the gap between the body 211 and the rectangular pipe inner wall 11 where the connection hole 101 is located and the gap between the connection plate 212 and the adjacent inner wall 12, respectively forming a transverse weld and a longitudinal weld. In order to make enough solder in the longitudinal welding seam, the body 211 and the connecting plate 212 are in transitional connection through the corner area 213, a groove is formed on the outer wall of the corner area 213, and a base accommodating groove 210 for accommodating the solder is formed between the groove and the inner wall of the rectangular tube 1. The solder is placed in the base receiving groove 210 during soldering so that a soldering gap between the connection plate 212 and the adjacent inner wall 12 is infiltrated with enough solder to improve soldering performance. In addition to providing a solder receiving space, the grooves in the corner areas 213 limit and secure the annular solder during assembly to reduce assembly difficulty.

On the other hand, the embodiment also provides application of the rectangular pipe liner pipe connecting structure. Specifically, as shown in fig. 8, 8A and 9, the present embodiment provides a refrigeration assembly including the rectangular tube liner connection structure described above. The refrigeration assembly is a fluid dividing/collecting assembly for dividing one fluid into multiple paths or collecting multiple paths of fluids into one path, and comprises a main pipe 100, a collecting pipe 200 and a plurality of branch pipes 300. The main pipe 100 adopts the rectangular pipe liner pipe connecting structure provided by the embodiment, namely, the rectangular pipe liner pipe connecting structure comprises a rectangular pipe 1, flanging hole liner plates 2 and two end covers 3 for plugging two ends of the rectangular pipe 1. One of the walls 11 of the rectangular tube 1 has a connection hole 101 and the other wall 13 opposite to the wall 11 has a branch hole 102 for connecting a plurality of branch tubes 300.

In this embodiment, the pipe diameter of the header 200 is close to the side length of the rectangular pipe where the connecting hole 101 is located, the aperture D of the assembling hole 220 connected with the header 200 on the flanging hole liner 2 is approximately equal to L-2R, and the flanging portion 22 provides a sufficient welding depth for the connection of the header 200 on the premise of keeping the rectangular pipe 1 and the connecting hole 101 undeformed, so that the air tightness and pressure resistance of the header 200 and the main pipe 100 after welding can meet the system pipeline requirements of the fluid separation/collection assembly.

In this embodiment, as shown in fig. 8 and 8A, the rectangular tube liner connection structure further includes a manifold liner 4 lining another wall 13 of the rectangular tube, the manifold liner 4 has a plurality of manifold liner holes 401, and the plurality of manifold tubes 300 of the fluid dividing/collecting assembly are respectively welded to the coaxial manifold holes 102 and the manifold liner holes 401. The provision of the main pipe lining plate 4 increases the welding depth of the branch pipe 300 to improve the welding performance. However, the present utility model is not limited in any way thereto. When the aperture of the branch pipe hole is far smaller than the side length of the rectangular pipe where the branch pipe hole is positioned, a flanging part of the branch pipe hole can be formed on the branch pipe hole in a flanging mode to meet the welding depth of the branch pipe; in this case, the fluid dividing/collecting assembly does not need to be provided with a branch lining board.

In this embodiment, the manifold liner 4 is a unitary liner having a large contact area with the other inner wall 13 of the rectangular tube. During brazing in the furnace, a large amount of solder permeates into the welding gap between the two under capillary penetration to weaken the solder between the outer wall of the branch pipe 300 and the branch pipe hole 102 and between the outer wall of the branch pipe 300 and the branch pipe substrate hole 401, thereby affecting the welding strength. For this purpose, the manifold liner 4 is provided in a lightweight structure to reduce the solder layer area between the manifold liner 4 and the other wall 13 of the rectangular pipe; in addition, the lightweight process can reduce the weight of the manifold liner and its material usage. However, the present utility model is not limited in any way thereto. In other embodiments, the manifold liner may also be configured in a segmented configuration to reduce the solder area between the manifold liner and the other wall of the rectangular tube.

As shown in fig. 10, the manifold liner 4 has a plurality of lightweight holes 402. However, the present utility model is not limited in any way thereto. In other embodiments, the edge of the manifold liner may be light-weighted to make it a light-weighted structure; as shown in fig. 11, the edge of the manifold liner 4 is provided in an uneven shape to reduce the area of the solder layer between it and the other wall of the rectangular pipe. In other embodiments, the edge relief lightening process may be combined with the lightening holes.

Although the present embodiment uses a refrigeration assembly as a fluid dividing/collecting assembly as an example, application of the rectangular tube liner connection structure will be described. However, the present utility model is not limited in any way thereto. In other embodiments, the refrigeration assembly formed by the rectangular tube liner connection structure may also be a three-way tube, especially a large three-way tube. As shown in fig. 12, the refrigeration assembly includes the rectangular tube liner connection structure provided in the present embodiment and the vertical nipple 500, and the vertical nipple 500 is welded to the burring part 22 on the burring liner 2. The two ends of the rectangular tube 1 and the ports of the vertical connection tube 500 form three ports of the three-way pipe fitting.

Example two

This embodiment is substantially the same as the first embodiment and its variations, except that: as shown in fig. 13, 14 and 15, the burring 22 'of the burring liner 2 extends into the rectangular tube, and the external pipe fitting is socket-welded to the connection hole 101 and the burring 22'. Similarly, in the present embodiment, the flanging portion 22 'is in transitional connection with the base 21 via the arc segment 23'; however, since the flange portion 22' extends toward the inside of the rectangular tube 1, a receiving groove 230' for fixing solder is formed between the outer wall of the circular arc segment 23' and the inner wall 11 of the rectangular tube where the connection hole 101 is located.

As for the possible structure of the flanging hole liner 2, the possible welding manner between the flanging hole liner and the rectangular tube, and the refrigeration assembly formed based on the rectangular tube liner connecting structure, the embodiment is the same as the first embodiment, and the description thereof is omitted.

In summary, according to the rectangular pipe liner connecting structure provided by the utility model, the flanging part is not directly formed on the connecting hole of the rectangular pipe so as to meet the welding depth, but the flanging hole liner plate with the flanging part is additionally arranged so as to meet the welding requirement of an external pipe. The arrangement ensures that the flanging part for welding and inserting is formed without influencing the rectangular pipe, and the appearance of the rectangular pipe and the connecting hole on the pipe wall are not deformed; meanwhile, the size of the flanging part for welding is not limited by the shape of the rectangular tube and the migration amount of materials, the aperture and the height of the flanging part can be well met according to actual needs, and the flanging end face is neat and the flanging part can be molded in various modes. Further, the base on the flanging hole lining plate provides a foundation for the welded connection between the flanging part and the rectangular pipe, which meets the air tightness and pressure resistance. The setting of flanging hole welt provides long enough welding depth for the welding of outside pipe fitting when guaranteeing that the rectangular pipe is not out of shape, has solved the welding leakage, the poor scheduling welding problem of pressure resistance that the welding depth is short because of the turn-ups portion is difficult to process of connecting hole of rectangular pipe when outside pipe fitting pipe diameter is great effectively. In addition, compared with the structure of the prior lining with a plurality of lining plates, the utility model can realize the connection of external pipe fittings by adopting the single part of the flanging hole lining plate, thereby not only having high connection strength, good welding air tightness, but also saving more material and materials and having lighter weight.

Although the utility model has been described with reference to the preferred embodiments, it should be understood that the utility model is not limited thereto, but rather may be modified and varied by those skilled in the art without departing from the spirit and scope of the utility model.

Claims (8)

1. A rectangular tube liner connection structure, comprising:

the pipe wall of the rectangular pipe is provided with a circular connecting hole;

the flanging hole lining plate comprises a base and a flanging part connected to the base, wherein the base is bonded and welded to the inner wall of a rectangular pipe, an assembly hole coaxial with a connecting hole is formed in the flanging part, and the aperture D of the assembly hole meets the following requirements: wherein L is the side length of the rectangular pipe where the connecting hole is located; the flanging part penetrates through the connecting hole of the rectangular pipe and extends to the outside of the rectangular pipe, and the external pipe fitting is welded on the flanging part; or the flanging part extends to the inside of the rectangular pipe, and the external pipe fitting is welded to the connecting hole and the flanging part.

2. The rectangular tube liner connection structure of claim 1, wherein the base is a planar plate;

or, the base includes the body and is on a parallel with the at least connecting plate that bends in the rectangular pipe of the axial edge of rectangular pipe on the body approximately, and the mounting hole forms in the body and body laminating welding in the rectangular pipe inner wall at connecting hole place, and the connecting plate laminating welding is in the adjacent inner wall of rectangular pipe.

3. The rectangular tube liner connection structure according to claim 2, wherein the body and the connection plate are in transitional connection through a corner area, a groove is formed on the outer wall of the corner area, and a base accommodating groove for accommodating solder is formed between the groove and the inner wall of the rectangular tube.

4. The rectangular tube liner connection structure according to claim 1, wherein the base and the inner wall of the rectangular tube are integrally welded and formed by brazing in a furnace;

or the connecting hole of the rectangular pipe is connected with the flanging part through self-melting or self-melting type wire adding welding, and the base is connected with the inner wall of the rectangular pipe through brazing welding in a furnace;

or the base and the inner wall of the rectangular pipe are connected by self-fluxing or self-fluxing type wire adding welding.

5. The rectangular tube liner connecting structure according to claim 1, wherein the flange portion is connected with the base through a circular arc section in a transitional manner, and a containing groove for fixing solder is formed between the outer wall of the circular arc section and the connecting hole of the rectangular tube or between the outer wall of the circular arc section and the inner wall of the rectangular tube.

6. A refrigeration assembly comprising the rectangular tube liner connection structure of any one of claims 1 to 5, wherein the refrigeration assembly is a three-way tube or a fluid dividing/collecting assembly.

7. The refrigeration assembly of claim 6, wherein the refrigeration assembly is a fluid dividing/collecting assembly, a plurality of branch pipe holes are formed in the other pipe wall of the rectangular pipe, the rectangular pipe liner connecting structure further comprises a branch pipe liner plate lined in the other pipe wall of the rectangular pipe, the branch pipe liner plate is provided with a plurality of branch pipe liner holes, and a plurality of branch pipes of the fluid dividing/collecting assembly are respectively welded and connected with the coaxial branch pipe holes and the branch pipe liner holes; the manifold liner is of a lightweight construction to reduce the solder layer area between the manifold liner and the other wall of the rectangular tube.

8. The refrigeration assembly of claim 7 wherein said manifold liner has a lightweight aperture therein; and/or the edge of the branch pipe lining plate is of a lightweight structure.