CN216203827U

CN216203827U - Tee pipe fitting and air conditioner for refrigeration

Info

Publication number: CN216203827U
Application number: CN202122117069.0U
Authority: CN
Inventors: 斯壮伟; 章杜波
Original assignee: Zhuji Sibeida Machinery Co ltd
Current assignee: Zhuji Sibeida Machinery Co ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-04-05
Anticipated expiration: 2031-09-02
Also published as: WO2023029887A1; JP2023553759A

Abstract

The utility model provides a three-way pipe fitting for refrigeration and an air conditioner. The stainless steel end cover is formed by integrally stretching a stainless steel plate, and is provided with a small-aperture end and a large-aperture end. The at least two lining plates are fixed after being overlapped and are welded at the large-aperture end of the stainless steel end cover in a sealing mode, two welding holes are formed in each lining plate, the corresponding welding holes of the at least two lining plates after being overlapped are overlapped to form two overlapping holes, and the hole depth of each overlapping hole is larger than or equal to 2.5 mm. The two branch pipes respectively extend into and are welded to the two overlapping holes in a sealing mode. The main pipe is welded to the small-aperture end of the stainless steel end cover in a sealing mode.

Description

Tee pipe fitting and air conditioner for refrigeration

Technical Field

The utility model relates to a refrigeration fitting, in particular to a tee pipe fitting for refrigeration and an air conditioner.

Background

In the refrigeration field, in particular to the refrigeration field of air conditioners, a three-way pipe fitting or a three-way pipe assembly is required when the pipelines are connected, and the function of the three-way pipe fitting or the three-way pipe assembly is mainly to divide liquid or gas into two paths from one path; or two paths are merged into one path. The universal three-way pipe fitting for refrigeration in the current market is made of copper or copper alloy materials and generally has the following structures; one is that a copper pipe is radially compressed and deformed to form an 8-shaped port, which is commonly called as a trouser tee or a stamping tee; one is formed by extruding and processing a copper pipe, and the shape and structure of the copper pipe are Y-shaped tee joints, T-shaped tee joints and claw-shaped tee joints; and thirdly, drilling and turning are carried out after brass forging to form a three-way pipe fitting structure, and a Y-shaped tee joint is mainly used in shape.

At present, all the refrigeration fittings are made of copper materials, but because copper is used as a noble metal, the shortage of resources in China needs to be greatly depended on import, and with the increasingly wide application and the increasingly high copper price of copper, the refrigeration industry faces huge rising pressure of the copper materials, so the research on copper substitute materials and product structures is the direction of effort of vast engineering technicians.

SUMMERY OF THE UTILITY MODEL

The utility model provides a three-way pipe fitting for refrigeration and an air conditioner, aiming at overcoming the defects of the prior art.

In order to achieve the purpose, the utility model provides a three-way pipe fitting for refrigeration, which comprises a stainless steel end cover, at least two lining plates, two branch flow pipes and a main pipe. The stainless steel end cover is formed by integrally stretching a stainless steel plate, and is provided with a small-aperture end and a large-aperture end. The at least two lining plates are fixed after being overlapped and are welded at the large-aperture end of the stainless steel end cover in a sealing mode, two welding holes are formed in each lining plate, the corresponding welding holes of the at least two lining plates after being overlapped are overlapped to form two overlapping holes, and the hole depth of each overlapping hole is larger than or equal to 2.5 mm. The two branch pipes respectively extend into and are welded to the two overlapping holes in a sealing mode. The main pipe is welded to the small-aperture end of the stainless steel end cover in a sealing mode.

According to an embodiment of the present invention, the outermost lining plate of the at least two lining plates is made of stainless steel, and the inner lining plate is made of stainless steel, copper or copper alloy.

According to an embodiment of the utility model, the tee pipe fitting for refrigeration further comprises a diversion guide plate, the diversion guide plate is arranged in the end cover cavity, the diversion guide plate is over against the main pipe and divides the end cover cavity into two diversion cavities corresponding to the two diversion branch pipes, and the diversion guide plate diverts fluid input by the main pipe and guides the fluid into the two diversion cavities.

According to one embodiment of the utility model, the shunting guide plate comprises a connecting part and a shunting guide part, the connecting part is fixedly connected with the innermost lining plate, and the free end of the shunting guide part is opposite to and extends towards the main pipe; alternatively, the diverter baffle is integrally formed with the innermost liner plate.

According to one embodiment of the utility model, at least two lining plates and the stainless steel end cover are connected by adopting circumferential seam sealing welding.

According to an embodiment of the utility model, the small-aperture end of the stainless steel end cover is provided with a flanging straight section facing to the inner side or the outer side of the stainless steel end cover, the height of the flanging straight section is more than or equal to 2.5 mm, and the main pipe is sleeved with the inner sleeve or the outer sleeve in the flanging straight section.

According to one embodiment of the utility model, the large bore end of the stainless steel end cap has an assembly straight section and the length of the assembly straight section is greater than the sum of the thicknesses of the at least two liner plates.

According to an embodiment of the present invention, the cross-sectional shape of the fitting straight section is any one of a circular shape, a square shape, an oval shape, a kidney shape, or a racetrack shape, and the shape of the liner plate matches the cross-sectional shape of the fitting straight section.

According to an embodiment of the utility model, the inner wall of the large-aperture end of the stainless steel end cover is provided with a positioning fixing part which protrudes inwards, the positioning fixing part is used for positioning and fixing at least two lining plates, and the positioning fixing part is a positioning step, a plurality of point-shaped positioning fixing parts, a multi-section arc positioning fixing part or a circular ring positioning fixing part.

In accordance with an embodiment of the present invention,

the shunt branch pipe is any one of a copper pipe, a stainless steel pipe, a carbon steel pipe or a welded combination of the copper pipe and the stainless steel pipe; the main pipe is any one of a copper pipe, a stainless steel pipe, a carbon steel pipe or a welding combination of the copper pipe and the stainless steel pipe.

According to an embodiment of the utility model, when the main pipe is a stainless steel pipe or a carbon steel pipe, the three-way pipe for refrigeration further comprises a copper sleeve connecting pipe sleeved at the end part of the main pipe, the copper sleeve connecting pipe is sleeved in the pipeline copper pipe, the length of a sleeved overlapping area formed by the pipeline copper pipe, the copper sleeve connecting pipe and the main pipe is L11, the sleeved length of the pipeline copper pipe and the copper sleeve connecting pipe is L01, the sleeved length of the copper sleeve connecting pipe and the main pipe is L21, L11 is more than or equal to 0.2L01 is less than or equal to 0.8L01, and L11 is more than or equal to 0.2L21 is less than or equal to 0.8L 21.

According to an embodiment of the present invention, when the branch pipes are stainless steel pipes or carbon steel pipes, the three-way pipe for refrigeration further includes two copper sheathing connection pipes which are internally sheathed at the ends of the two branch pipes, the two pipeline copper pipes are respectively internally sheathed in the two copper sheathing connection pipes, the length of the sheathing overlapping region formed by each pipeline copper pipe, each copper sheathing connection pipe and each branch pipe is L12, the sheathing length of the pipeline copper pipe and the corresponding copper sheathing connection pipe is L02, the sheathing length of the copper sheathing connection pipe and the corresponding branch pipe is L22, L12 which is 0.2L02 or more is less than or equal to 0.8L02, and L12 which is 0.2L22 or more is less than or equal to 0.8L 22.

On the other hand, the utility model also provides an air conditioner which comprises the three-way pipe fitting for refrigeration.

In conclusion, in the refrigeration tee pipe fitting and the air conditioner provided by the utility model, the stainless steel end cover and the plurality of lining plates are of a combined structure, and the stainless steel end cover can be integrally formed by drawing a plate, so that the forming process and the processing difficulty of the tee main body part are greatly simplified. On one hand, due to the superposition of the lining plates, the formed superposed holes provide enough depth for the insertion of the branch flow dividing pipes, and the welding strength of the branch flow dividing pipes is ensured; on the other hand, each lining plate can independently adopt a simple stamping process to form a welding hole, so that the manufacturing cost is greatly reduced while the machining precision of the welding hole is ensured, and the contradiction relation between the machining of the welding hole and the welding depth on the lining plate is well solved. The stainless steel end cover and the at least two lining plates are arranged, so that the whole product can be manufactured only by adopting a simple stamping and stretching forming process, conditions are provided for the main body part of the three-way piece with larger consumable material to adopt stainless steel materials to replace copper materials, and the material cost of the product is greatly reduced.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic structural diagram of a conventional tee fitting; wherein, fig. 1(a) is a Y-shaped three-way pipe structure; FIG. 1(b) shows a T-shaped three-way tube structure; FIG. 1(c) is a claw-type three-way tube structure; FIG. 1(d) shows a stamped tee structure; and (e) in the figure 1, drilling and turning are carried out after brass forging to form the three-way pipe fitting structure.

Fig. 2 is a schematic structural diagram of a three-way component for refrigeration according to an embodiment of the present invention.

Fig. 3 is an enlarged schematic view of a portion a of fig. 2.

Fig. 4A is a schematic structural view of the stainless steel end cap of fig. 1.

Fig. 4B is a schematic structural diagram of fig. 4A from another viewing angle.

Fig. 5A is a schematic structural view of the liner plate of fig. 1.

Fig. 5B is a schematic cross-sectional view of fig. 5A.

Fig. 6A to 6C are schematic structural views of a stainless steel end cap and a corresponding liner plate according to another embodiment of the present invention.

Fig. 6D and 6E are schematic structural views of a stainless steel end cap according to another embodiment of the utility model.

Fig. 7 is a schematic structural view of a three-way pipe for refrigeration according to another embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a refrigerating tee pipe applied to a multi-split mounting system of a central air conditioner according to a second embodiment of the present invention.

Fig. 9A to 9D are schematic structural views of a refrigeration tee pipe applied to a multi-split installation system of a central air conditioner according to another embodiment of the present invention.

Fig. 10 is a schematic structural view of a three-way pipe fitting for refrigeration according to a third embodiment of the present invention.

Fig. 11A is a schematic structural view of the flow diversion plate in fig. 10.

Fig. 11B is a cross-sectional view of the flow directing plate of fig. 11A.

Fig. 12 and 13 are schematic structural views of a diverter baffle according to another embodiment of the present invention.

Fig. 14 is a schematic structural view of a three-way pipe for refrigeration according to another embodiment of the present invention.

Fig. 15 is a schematic structural view of a three-way pipe fitting for refrigeration according to a fourth embodiment of the present invention.

Fig. 15A is an enlarged schematic view of fig. 15 at B.

Fig. 15B is an enlarged schematic view of C in fig. 15.

Fig. 16 is a schematic structural view of a three-way pipe for refrigeration according to another embodiment of the present invention.

Detailed Description

Example one

FIG. 1 is a schematic structural diagram of a conventional tee pipe fitting made of copper or copper alloy, and FIG. 1(a) is a Y-shaped tee pipe structure; FIG. 1(b) shows a T-shaped three-way tube structure; FIG. 1(c) is a claw-type three-way tube structure; FIG. 1(d) shows a stamped tee structure; and (e) in the figure 1, drilling and turning are carried out after brass forging to form the three-way pipe fitting structure.

Compared with the expensive copper or copper alloy material, the low-cost stainless steel material is very ideal for preparing the tee pipe fitting. However, the stainless steel material and the copper material have very large differences in material properties, which is particularly shown in that the two plastic indexes of elongation and reduction of area of the stainless steel material are poorer than those of the copper or copper alloy material, so that the turning force required for processing the stainless steel material under the same condition is very large, and the stainless steel material also has the problems of difficult breakage in turning, easy adhesion and the like. Therefore, for the low-cost stainless steel material, the existing structures of the tee pipe fittings shown in fig. 1 are difficult to form by adopting the processes of radial compression, extrusion or turning after forging and pressing.

In view of this, as shown in fig. 2 to 5B, the present embodiment provides a three-way pipe for refrigeration, which is different from the existing three-way pipe structure, and includes a stainless steel end cover 1, at least two lining plates 2, two branch pipes 3, and a main pipe 4. The stainless steel end cover 1 is integrally formed by stretching a stainless steel plate, and the stainless steel end cover 1 is provided with a small-bore end 11 and a large-bore end 12. The at least two lining plates 2 are fixedly welded to the large-aperture end 12 of the stainless steel end cover in a sealing mode after being stacked, each lining plate 2 is provided with two welding holes 21, the corresponding welding holes 21 of the at least two lining plates 2 after being stacked are overlapped to form two overlapping holes, and the hole depth H1 of each overlapping hole is larger than or equal to 2.5 mm. The two branch pipes 3 respectively extend into and are welded to the two overlapped holes in a sealing mode. The main tube 4 is hermetically welded to the small bore end 11 of the stainless steel end cap.

In this embodiment, the three-way pipe fitting for refrigeration includes two lining plates 2, and the depth H1 of the overlapping hole formed by overlapping the corresponding welding holes 21 after the two lining plates 2 are overlapped is 5 mm. However, the present invention is not limited thereto. In other embodiments, the number and thickness of the lining plates can be adjusted to make the hole depth of the overlapping holes meet the insertion requirement of the branch flow pipe, the number of the lining plates can be more than three, and the hole depth H1 of the overlapping holes can be other values larger than 2.5 mm.

In the tee bend pipe fitting for refrigeration that this embodiment provided, be split type integrated configuration between stainless steel end cover 1 and two welts 2, this setting makes both can independently process to reduce the processing degree of difficulty. Further, in this embodiment, the stainless steel end cover 1 is formed by stretching a plate, and the plate with a small thickness is used as a raw material for stretching, so that the forming difficulty of the stainless steel end cover 1 is greatly reduced. On the other hand, for the two lining plates 2, on the one hand, the two lining plates are hermetically welded on the large-aperture end 12 of the stainless steel end cover, and an end cover cavity is formed in the stainless steel end cover 1, so that the distribution of the fluid input by the main pipe 4 to the two branch pipes 3 is realized. On the other hand, the arrangement of the two lining plates 2 greatly improves the processing precision of the welding hole 21 while ensuring the welding depth of the branch pipe 3.

Specifically, in order to ensure the welding strength during welding, the insertion of the welding portion is required to meet the necessary insertion depth; in the air conditioning and refrigeration industry, the insertion depth is generally more than 2.5 mm. In the processing technology, in order to realize the assembly of the shunt branch pipe 3, a punching mode is needed to form the welding hole. For a thick material, such as a plate with a thickness of more than 3 mm, since the plate is thick and has high tensile strength, when a blanking force counteracts, the plate at the periphery of a punched hole contacted with the punch will collapse downwards, the plate deforms, and a welded hole formed after machining has poor dimensional accuracy. Therefore, there is a conflict between the requirement for the machining accuracy of the welded hole and the requirement for the insertion depth of the welded portion during welding. In this embodiment, two separate liner plates 2 are stacked and assembled into the large bore end 12 of the stainless steel end cap. In the processing stage, the two lining plates 2 are independently processed, and two high-precision welding holes 21 are processed in the corresponding positions on the lining plates 2 respectively by adopting a stamping process. Thereafter, in the assembly phase, the two lining plates 2 are superposed, and the corresponding welding holes 21 are superposed to form two superposed holes. The depth H1 of each overlapping hole is the sum of the thicknesses of the two liner plates 2, and this arrangement provides sufficient depth for insertion of the branch pipes 3 so that the welding strength of the branch pipes 3 after welding can be ensured.

In the three-way pipe fitting for refrigeration provided by the embodiment, the structural arrangement of the stainless steel end cover 1 and the two lining plates 2 ensures that the product performance requirements and the process requirements are not mutually restricted, so that the stainless steel end cover 1 and the lining plates 2 with the largest consumable material specific gravity in the three-way pipe fitting for refrigeration provided by the embodiment can be prepared by adopting a low-cost stainless steel material, and the material cost and the production cost of the product are greatly reduced.

In this embodiment, two welts 2 are stainless steel, and two welts 2 superpose the back and fix and seal weld connect in the big aperture end 12 of stainless steel end cover 1. However, the present invention is not limited thereto. In other embodiments, the outermost liner plate may be made of stainless steel, and one or more inner liner plates may be made of copper or copper alloy. Alternatively, in other embodiments, when the inner liner plates are multiple, the multiple inner liner plates may be different, such as one portion being made of copper and the other portion being made of stainless steel. The outermost liner refers to: the lining plate which is closest to the end part of the large-aperture end is welded after the lining plates are overlapped and welded at the large-aperture end; the inner liner refers to: the lining plate is positioned on the side, close to the small-aperture end, of the lining plate on the outermost side. In fig. 3, the lining panel 2_1 is the outermost lining panel, and the lining panel 2_2 is the inner lining panel.

In the embodiment, the two lining plates 2 are welded together by resistance welding after being respectively and independently punched to form welding holes 21; and then nested together within the large bore end 12 of the stainless steel end cap. However, the present invention is not limited thereto. In other embodiments, the two may be connected by other methods, such as argon arc welding or laser welding. Alternatively, in other embodiments, the two may be fixedly connected mechanically.

In order to facilitate the fixation of the two lining plates 2, the inner wall of the large-aperture end 12 of the stainless steel end cover is provided with a positioning and fixing part 121 which protrudes inwards. Specifically, as shown in fig. 2, in the present embodiment, although the inner wall of the large-aperture end 12 of the stainless end cap has a step, since the height of the straight assembly section 13 is relatively high, the two lining plates 2 are not fixed by the step, but two lining plates 2 are fixed by forming a circular positioning fixing part on the inner wall of the large-aperture end 12 of the stainless end cap by notching. However, the present invention is not limited thereto. In other embodiments, as shown in fig. 7, the step may be directly used as the positioning fixing portion, or a plurality of point-like positioning fixing portions or a plurality of arc-shaped positioning fixing portions may be formed by dotting or partially grooving.

In order to further facilitate the assembly of the lining plates 2 and improve the strength after welding, in this embodiment, the large-bore end 12 of the stainless end cover further has an assembly straight section 13, and the length of the assembly straight section 13 is greater than the sum of the thicknesses of the two lining plates 2.

In this embodiment, the cross-sectional shape of the straight fitting section 13 is an ellipse, and the shapes of the two corresponding lining plates are also ellipses. However, the present invention is not limited thereto. In other embodiments, as shown in fig. 6A to 6C, the cross-sectional shape of the straight assembly section 13 may be any one of a square shape, an oval shape, a kidney shape, or a racetrack shape, and the shape of the liner plate 2 matches the cross-sectional shape of the straight assembly section. Fig. 6A to 6C (a) are schematic structural views of the stainless steel end cap, and (b) is a shape corresponding to the shape of the backing plate 2. The present invention is not limited in this regard to the shape of the transition section 14 between the straight section 13 and the small bore end 11 of the stainless steel end cap. The shape thereof may be the same as the cross-sectional shape of the fitting straight section 13; and can be adjusted according to the machining or rear end assembly requirements. As shown in fig. 6D and 6E, the cross-sectional shape of the straight section 13 is circular in fig. 6D, while the cross-sectional shape of the transition section 14 is square; in fig. 6E, the cross-sectional shape of the straight fitting section 13 is racetrack shaped, while the cross-sectional shape of the transition section 14 is circular.

In this embodiment, the small-bore end 11 of the stainless steel end cap has a flanged straight section 15 facing the outside of the stainless steel end cap 1, the height H2 of the flanged straight section 15 is equal to 3 mm, and the main tube 4 is sleeved in the flanged straight section 15. However, the present invention is not limited thereto. In other embodiments, the height H2 of the flanged straight section may be other values greater than 2.5 mm, and the main tube may be sleeved on the flanged straight section. Alternatively, in other embodiments, the straight flanging section may face the inside of the stainless steel end cover, and the main pipe is sleeved in the straight flanging section.

In this embodiment, the two branch pipes 3 are stainless steel pipes which are hermetically connected to the two overlapping holes of the two lining plates 2 by self-welding or self-fluxing wire-bonding. Likewise, the main tube 4 is also a stainless steel tube which is sealingly connected to the small bore end 11 of the stainless steel end cap by autogenous welding or autogenous wire welding. However, the present invention is not limited thereto. In other embodiments, the two branch pipes and the main pipe can also be copper pipes; or a combination of copper and stainless steel tubes.

In this embodiment, the two branch pipes 3 are both straight pipes. However, the present invention is not limited thereto. In other embodiments, as shown in fig. 7, the two branch pipes 3 may be elbows.

On the other hand, this embodiment still provides an air conditioner, and this air conditioner contains the tee bend pipe fitting for refrigeration that this embodiment provided.

Example two

This embodiment is substantially the same as the first embodiment and its variations, except that: as shown in fig. 8, the first branch pipe 31 is a straight pipe; the second branch pipe 32 is a bent pipe, the middle of the second branch pipe 32 is bent away from the first branch pipe 31, and the output end axis of the second branch pipe is parallel to the output end axis of the first branch pipe 31. The tee pipe fitting for refrigeration with the structure can be used for distributing refrigerants from a cold heat source system to a plurality of indoor units in a central air-conditioning multi-split mounting system, and replaces the existing copper branch pipe with high price, so that the cost of the central air-conditioning multi-split mounting system is greatly reduced.

However, the present invention does not set any limit to the direction of the output of the second branch flow path. In other embodiments, the output direction of the second branch pipes can be adjusted according to the distribution position of the indoor units, as shown in fig. 9A.

In fig. 8, the first branch flow pipe 31, the second branch flow pipe 32, and the main pipe 4 are each a combined structure of a copper pipe and a stainless steel pipe. The connecting sections 311,321 of the two branch pipes welded with the overlapped holes are stainless steel pipes, and the subsequent extending sections 312,322 are copper pipes. Similarly, the connecting section 41 of the main pipe 4 connected with the small-bore end 11 of the stainless end cover is a stainless steel pipe, and the extending section 42 of the main pipe is a copper pipe. However, in fig. 9A, the first branch flow pipe 31 and the second branch flow pipe 32 are each a combined structure of a copper pipe and a stainless steel pipe; and the main pipe 4 is a copper pipe.

Although the present embodiment provides the second branch flow pipe 32 as a bent pipe in the tee pipe for refrigeration used in the multiple air conditioner installation system; however, the present invention is not limited thereto. In other embodiments, the second branch pipes 32 of the tee pipe for cooling used in the multi-split central air conditioning installation system may also be straight pipes according to installation requirements, as shown in fig. 9B and 9C. In fig. 9B, all of the first branch pipe 31, the second branch pipe 32, and the main pipe 4 are copper pipes. In fig. 9C, the first branch flow pipe 31 and the second branch flow pipe 32 are copper pipes, the main pipe 4 is a combined structure of a copper pipe and a stainless steel pipe, the connecting section 41 of the main pipe 4 connected to the small-bore end 11 of the stainless steel end cap is a stainless steel pipe, and the extending section 42 of the main pipe is a copper pipe. Alternatively, as shown in fig. 9D, the first branch flow pipe 31 and the second branch flow pipe 32 are a combination structure of a copper pipe and a stainless steel pipe, the connecting

sections

311 and 321 where the two branch flow pipes are welded to the overlapped hole are stainless steel pipes, the subsequent extending

sections

312 and 322 are copper pipes, and the main pipe 4 is a copper pipe.

EXAMPLE III

This embodiment is substantially the same as the first embodiment and its variations, except that: as shown in fig. 10 and 11, the three-way pipe for refrigeration provided in this embodiment further includes a diversion plate 5. The diversion guide plate 5 is arranged in the end cover cavity, the diversion guide plate 5 is right opposite to the main pipe 4 and divides the end cover cavity into two

diversion cavities

101 and 102 corresponding to the two diversion branch pipes. The diversion baffle 5 diverts the fluid input from the main pipe 4 and guides the fluid into the two

diversion cavities

101 and 102. The end cover cavity refers to a cavity formed in the stainless steel end cover 1 after the two lining plates 2 are welded to the large-aperture end 12 of the stainless steel end cover in a sealing mode.

The diversion guide plate 5 which is opposite to the main pipe 4 actively diverts the fluid input by the main pipe 4, thereby improving the diversion effect.

In this embodiment, as shown in fig. 11, the diversion baffle 5 includes a connection portion 51 and a diversion flow portion 52, the connection portion 51 is fixedly connected to the innermost lining plate 2, and a free end of the diversion flow portion 52 extends toward the main pipe 4. Specifically, the connection portion 51 and the diversion flow guide portion 52 are formed by welding two sheet-shaped plate bodies, and then the connection portion 51 is welded and fixed to the innermost lining plate 2. However, the present invention is not limited thereto. In other embodiments, as shown in fig. 12, the diversion baffle 5 may also be a sheet-shaped plate body that is bent and integrally formed. The flow diversion part 52 is a bent part protruding in the middle, and the horizontal shoulders on both sides of the flow diversion part 52 form a connecting part 51. Alternatively, in other embodiments, the splitter baffle 5 may be integrally formed with the innermost liner as shown in fig. 13.

Fig. 14 is a schematic structural view of a tee for refrigeration in another embodiment.

Example four

Because most of the existing air-conditioning pipelines are copper pipes, the main pipe or the shunt branch pipe can adopt a composite structure of a stainless steel pipe and a copper pipe (or a carbon steel pipe and a copper pipe) in order to facilitate the connection of the tee pipe fitting and an external copper pipe for refrigeration. During assembly welding: firstly, a stainless steel pipe and a copper pipe are brazed in a furnace to form a composite part; and secondly, performing flame brazing connection on the copper pipe end of the composite part and the pipeline copper pipe. Two problems are encountered in the case of such welded connections: the stainless steel pipe and the copper pipe are brazed in a furnace, and the tensile strength is reduced because metallographic structure crystal grains of the copper pipe are enlarged after long-time furnace welding, so that the compressive strength of the whole pipeline can be directly reduced when the subsequent copper pipe is welded and connected with the pipeline copper pipe again. Secondly, when the composite part and the pipeline copper pipe are welded by flame brazing and heating, the brazing layer formed between the stainless steel pipe and the copper pipe can be heated by the welding heat for the second time, and the leakage of the product is easy to cause.

In view of the above, the present embodiment provides another three-way pipe for refrigeration. This embodiment is substantially the same as the first embodiment and its variations, except that: as shown in fig. 15, 15A, and 15B, in the present embodiment, the main pipe 4, the two branch pipes 3, and the two lining plates 2 are all made of stainless steel. The tee pipe fitting for refrigeration further comprises a first copper sleeve connecting pipe 61 and two second copper sleeve connecting pipes 62, the first copper sleeve connecting pipe 61 is connected to the main pipe 4 in an inner sleeved mode, and the two second copper sleeve connecting pipes 62 are respectively sleeved in the two branch flow distributing pipes 3 in an inner sleeved mode. The first pipeline copper pipe 101 in the external system pipeline is sleeved in the first copper sleeve connecting pipe 61, and the two second pipeline copper pipes 102 are respectively sleeved in the second copper sleeve connecting pipes 62.

For the first copper sheathing connection pipe 61, as shown in fig. 15A, the length of the overlapping region of the three sheathing formed by the first pipeline copper pipe 101, the first copper sheathing connection pipe 61 and the main pipe 4 is L11, the sheathing length of the first pipeline copper pipe 101 and the first copper sheathing connection pipe 61 is L01, the sheathing length of the first copper sheathing connection pipe 61 and the main pipe 4 is L21, L11 is greater than or equal to 0.2L01 and less than or equal to 0.8L01, and L11 is greater than or equal to 0.2L21 and less than or equal to 0.8L 21.

For each second copper sheathing connection pipe 62, as shown in fig. 15B, the length of the overlapping region formed by the second copper sheathing connection pipe 102, the second copper sheathing connection pipe 62 and the branch flow pipe 3 is L12, the length of the overlapping region formed by the second copper sheathing connection pipe 102 and the branch flow pipe 3 is L02, the length of the overlapping region formed by the second copper sheathing connection pipe 62 and the branch flow pipe 62 is L22, L12 is 0.2L02 and 0.8L02, and L12 is 0.2L22 and 0.8L 22.

The structure of the first copper bush connection pipe 61 will be described below as an example, in which the copper bush connection pipes are added to the present embodiment, and the plurality of second copper bush connection pipes 62 are the same principle.

Although the first copper bush connecting pipe 61 and the main pipe 4 still have the problem that the metallurgical structure crystal grains of the first copper bush connecting pipe 61 are coarse after the furnace brazing, so that the compressive strength is reduced during the pipe connection, the main pipe 4, the first copper bush connecting pipe 61 and the first pipeline copper pipe 101 are sequentially sleeved to form a sleeved overlapping area with the length of L11, and the sleeved overlapping area L11 meets the following conditions: l11 is more than or equal to 0.2L01 and less than or equal to 0.8L01, and L11 is more than or equal to 0.2L21 and less than or equal to 0.8L 21. The test proves that: in the sleeved overlapping area of the three pipes with the length L11 satisfying the above size condition, the first copper sleeve connecting pipe 61 and the two outer walls of the main pipe 4 are welded, overlapped and reinforced outside the first pipeline copper pipe 101, so that the reduction of the compressive strength at the position can not be caused. Furthermore, the above size conditions also ensure that the first pipeline copper pipe 101 only partially extends into the sleeving area between the first copper sleeve connecting pipe 61 and the main pipe 4, so that when the first pipeline copper pipe 101 and the first copper sleeve connecting pipe 61 are subjected to flame brazing, the brazing layer formed between the first copper sleeve connecting pipe 61 and the main pipe 4 is only partially affected, and the leakage problem caused by secondary fusion welding of the brazing layer is effectively avoided.

In the tee pipe fitting for refrigeration that this embodiment provided, the problem of the low compressive strength that exists and the leakage that secondary fusion welding caused has been solved well in the setting of first copper sheathing connecting pipe 61 and second copper sheathing connecting pipe 62 when stainless steel is responsible for 4 and stainless steel shunt branch 3 and outside pipeline copper pipe welding, has improved tee pipe fitting for refrigeration and outside copper pipe's compressive strength and security greatly. Although the present embodiment is described by taking a stainless main pipe and a branch pipe as an example, the present invention is not limited to this. In other embodiments, when the main pipe and the branch pipes are carbon steel pipes, the welding structure provided by the embodiment is also applicable.

During the assembly, for the convenient control first pipeline copper pipe 101 and the length L01 that cup joints of first copper sheathing connecting pipe 61, in other embodiments, can set up the spacing portion of cup jointing of inside bellied on the inner wall of first copper sheathing connecting pipe 61, cup joint the insertion depth of spacing portion injectting first pipeline copper pipe 101 to realize cup jointing the accurate control of length L01. Similarly, an inward protruding socket limiting portion may be disposed on the inner wall of the second copper socket connecting tube 62, and the socket limiting portion limits the insertion depth of the second pipeline copper tube 102, so as to achieve accurate control of the socket length L02. The sleeve joint limiting part can be any one of a plurality of point-shaped sleeve joint limiting parts, a multi-section arc sleeve joint limiting part or a circular ring sleeve joint limiting part.

The first and second

pipeline copper pipes

101 and 102 may be part of a tee for refrigeration, that is, the tee for refrigeration includes the first and second

pipeline copper pipes

101 and 102. Or the three-way pipe fitting for refrigeration does not comprise two pipeline copper pipes, and the first pipeline copper pipe 101 and the second pipeline copper pipe 102 are both pipe fittings on external air-conditioning parts.

In this embodiment, the welding structure of the stainless steel branch pipe 3, the copper sleeve connecting pipe 62 and the second pipeline copper pipe 102 is described by taking the two branch pipes 3 as straight pipes. However, the present invention is not limited thereto. As shown in fig. 16, the refrigeration tee pipe provided in the second embodiment, in which one of the branch pipes is an elbow pipe, is also suitable for welding of such a structure.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A tee fitting for refrigeration, comprising:

the stainless steel end cover is integrally formed by stretching a stainless steel plate, and is provided with a small-aperture end and a large-aperture end;

the stainless steel end cover comprises at least two lining plates, a sealing ring and a sealing ring, wherein the lining plates are fixed and welded to the large-aperture end of the stainless steel end cover after being overlapped, each lining plate is provided with two welding holes, the corresponding welding holes of the at least two lining plates after being overlapped are overlapped to form two overlapping holes, and the hole depth of each overlapping hole is larger than or equal to 2.5 mm;

the two branch flow pipes respectively extend into and are welded to the two overlapping holes in a sealing manner;

the main pipe is welded to the small-bore end of the stainless steel end cover in a sealing mode.

2. The tee fitting for refrigeration of claim 1, wherein an outermost liner plate of the at least two liner plates is made of stainless steel, and an inner liner plate of the at least two liner plates is made of stainless steel, copper or copper alloy.

3. The tee pipe fitting for refrigeration of claim 1, further comprising a diversion flow guide plate disposed in the end cap cavity, the diversion flow guide plate facing the main pipe and dividing the end cap cavity into two diversion cavities corresponding to the two diversion branch pipes, the diversion flow guide plate diverting and guiding fluid input from the main pipe into the two diversion cavities.

4. The tee pipe fitting for refrigeration of claim 3, wherein the flow dividing and guiding plate comprises a connecting part and a flow dividing and guiding part, the connecting part is fixedly connected to the innermost lining plate, and the free end of the flow dividing and guiding part is oppositely extended towards the main pipe; or the diversion guide plate and the innermost lining plate are integrally formed.

5. The tee fitting of claim 1, wherein at least two liner plates are sealingly welded to the stainless steel end cap at circumferential seams.

6. The tee pipe fitting for refrigeration of claim 1, wherein the small-bore end of the stainless steel end cap has a flanged straight section facing the inside or outside of the stainless steel end cap, the flanged straight section has a height of 2.5 mm or more, and the main pipe is sleeved with the flanged straight section.

7. The tee fitting of claim 1, wherein the large bore end of the stainless steel end cap has an assembly straight section and the length of the assembly straight section is greater than the sum of the thicknesses of the at least two liner plates.

8. The tee fitting for refrigeration of claim 7, wherein the cross-sectional shape of the fitting straight section is any one of circular, square, oval, kidney or racetrack shaped, and the shape of the liner plate matches the cross-sectional shape of the fitting straight section.

9. The tee pipe fitting for refrigeration of claim 1, wherein an inner wall of the large-bore end of the stainless end cover has an inwardly projecting positioning fixing portion for positioning and fixing at least two lining plates, the positioning fixing portion being a positioning step, a plurality of point-like positioning fixing portions, a multi-stage circular arc positioning fixing portion or a circular ring positioning fixing portion.

10. The tee pipe fitting for refrigeration of claim 1, wherein the branch pipe is any one of a copper pipe, a stainless steel pipe, a carbon steel pipe or a welded combination of a copper pipe and a stainless steel pipe; the main pipe is any one of a copper pipe, a stainless steel pipe, a carbon steel pipe or a welding combination of the copper pipe and the stainless steel pipe.

11. The tee pipe fitting for cooling as claimed in claim 10, wherein when the main pipe is a stainless steel pipe or a carbon steel pipe, the tee pipe fitting for cooling further comprises a copper sheathing connection pipe sheathing the end of the main pipe, the copper sheathing connection pipe sheathing the copper sheathing connection pipe, the length of the sheathing overlapping region formed by the copper sheathing connection pipe, the copper sheathing connection pipe and the main pipe is L11, the sheathing length of the copper sheathing connection pipe and the copper sheathing connection pipe is L01, the sheathing length of the copper sheathing connection pipe and the main pipe is L21, 0.2L01 is L11 is 0.8L01, and 0.2L21 is L11 is 0.8L 21.

12. The tee fitting for refrigeration of claim 10, further comprising two copper sheathing connection pipes internally fitted to ends of the two branch pipes, wherein the two copper sheathing connection pipes are respectively internally fitted to the two copper sheathing connection pipes, a sheathing overlapping region formed by each of the copper sheathing connection pipes, the copper sheathing connection pipes and the branch pipes has a length of L12, a sheathing length of L02 between the copper sheathing connection pipe and the corresponding copper sheathing connection pipe, a sheathing length of L22 between the copper sheathing connection pipe and the corresponding branch pipe is 0.2L02 ≤ L12 ≤ 0.8L02, and a sheathing length of 0.2L22 ≤ L12 ≤ 0.8L 22.

13. An air conditioner characterized by comprising the three-way pipe for refrigeration as claimed in any one of claims 1 to 12.