Whistle pipe assembly and heating and ventilation device having the same

Abstract

The utility model discloses a flute shape pipe subassembly and have its warm and ventilate device, flute shape pipe subassembly includes main body pipe and a plurality of branch pipes, is provided with a plurality of connecting holes on main body pipe, a plurality of branch pipes are installed in connecting hole place one by one, wherein, main body pipe is flexible stainless steel integrated stainless steel pipe, and / or, at least one branch pipe is flexible stainless steel integrated stainless steel pipe, and the material composition of flexible stainless steel at least includes copper. According to the flute shape pipe subassembly of the utility model, by setting up main body pipe and / or at least one branch pipe as flexible stainless steel integrated stainless steel pipe, can promote the reliability in the working process of flute shape pipe subassembly, and can reduce the design difficulty and assembly difficulty of warm and ventilate device, improve assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heating, ventilation and air conditioning (HVAC), and in particular to a flute-shaped tube assembly and an HVAC device having the same. Background Technology

[0002] The HVAC system includes a flute assembly used to deliver refrigerant compressed by the compressor to the heat exchanger. In related technologies, as the refrigerant flows within the flute assembly, it impacts the assembly. Additionally, the compressor vibrates during HVAC operation, resulting in low reliability of the flute assembly. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a flute-shaped tube assembly to improve the reliability of the flute-shaped tube assembly during operation.

[0004] This utility model also proposes a heating and ventilation device having the above-mentioned flute-shaped tube assembly.

[0005] According to a first aspect of the present invention, a flute-shaped tube assembly includes: a main tube having a plurality of connecting holes; and multiple branch tubes, each branch tube being installed at one of the connecting holes in a corresponding manner. The main tube is a flexible stainless steel tube integrally formed, and / or at least one of the branch tubes is a flexible stainless steel tube integrally formed.

[0006] According to embodiments of the present invention, by setting the main tube and / or at least one of the branch tubes as stainless steel tubes, the reliability of the flute tube assembly during operation can be improved, and the design and assembly difficulty of HVAC systems can be reduced, thereby increasing assembly efficiency. According to some embodiments of the present invention, the main tube is a one-piece molded flexible stainless steel tube, comprising a first straight tube, a second straight tube, and a bent tube, wherein the bent tube is connected between the first straight tube and the second straight tube, and multiple branch tubes are all connected to the first straight tube.

[0007] According to some embodiments of this utility model, the diameters of the first straight pipe and the second straight pipe are both d, and the bending radius of the bent pipe is r, satisfying 1.2d≤r≤1.5d.

[0008] According to some embodiments of the present invention, an expansion tube is provided at the end of the second straight tube away from the bending tube, and the diameter of the expansion tube is larger than the diameter of the second straight tube; and / or, a retraction tube is provided at the end of the second straight tube away from the bending tube, and the diameter of the retraction tube is smaller than the diameter of the second straight tube.

[0009] According to some embodiments of the present invention, the expansion tube includes at least one sub-expansion tube. When there are multiple sub-expansion tubes, the multiple sub-expansion tubes are connected in sequence, and the diameters of the multiple sub-expansion tubes increase in sequence in the direction from the bend tube to the second straight tube; and / or, the retraction tube includes at least one sub-retraction tube. When there are multiple sub-retraction tubes, the multiple sub-retraction tubes are connected in sequence, and the diameters of the multiple sub-retraction tubes decrease in sequence in the direction from the bend tube to the second straight tube.

[0010] According to some embodiments of the present invention, the main tube is integrally formed with a flange, the flange being annular around the outer periphery of the connecting hole, and the branch tube is inserted into the flange.

[0011] According to some embodiments of the present invention, the main tube is a stainless steel tube integrally formed from flexible stainless steel, and an arc chamfer is formed at the connection between the flange and the main tube. The radius of the arc chamfer is less than 1.5 times the wall thickness of the main tube. In the radial direction of the main tube, the height of the flange is greater than the wall thickness of the main tube.

[0012] According to some embodiments of the present invention, the branch pipe has a limiting part that cooperates with the flange limiting part.

[0013] According to some embodiments of the present invention, the limiting part is a convex bulge or an annular protrusion extending around the axis of the branch pipe.

[0014] According to some embodiments of the present invention, a shrink tube is provided at one end of the branch pipe near the main pipe, the diameter of the shrink tube is smaller than the diameter of the branch pipe, and the shrink tube is engaged with the flange.

[0015] According to some embodiments of the present invention, the yield strength of the flexible stainless steel is 140-180 MPa; and / or, the tensile strength of the flexible stainless steel is reduced to 400-600 MPa; and / or, the elongation of the flexible stainless steel is 50-80%; and / or, the yield strength ratio of the flexible stainless steel is less than 0.4; and / or, the hardness of the flexible stainless steel material is 100-120 Hv.

[0016] According to some embodiments of this utility model, the Md30 of the flexible stainless steel is -50℃ to -80℃.

[0017] According to some embodiments of the present invention, the flexible stainless steel is austenitic stainless steel, and the average grain size of the flexible stainless steel is 20μm to 40μm.

[0018] According to some embodiments of this utility model, the wall thickness of the stainless steel pipe is 1.2mm to 1.5mm.

[0019] According to some embodiments of the present invention, the main pipe and the branch pipe are both integrally formed stainless steel pipes of the flexible stainless steel; and / or, the end of the branch pipe away from the main pipe is connected to an external pipe, and the branch pipe and the external pipe are both integrally formed stainless steel pipes of the flexible stainless steel.

[0020] According to some embodiments of the present invention, one of the main pipe and the branch pipe is a stainless steel pipe integrally formed from flexible stainless steel, and the other is a copper pipe or a copper alloy pipe; and / or, the end of the branch pipe away from the main pipe is connected to an external pipe, and one of the branch pipe and the external pipe is a stainless steel pipe integrally formed from flexible stainless steel, and the other is a copper pipe or a copper alloy pipe.

[0021] According to some embodiments of the present invention, a first sleeve is welded to the connecting hole of the main tube, and a second sleeve is welded to the end of the branch tube. The first sleeve and the second sleeve are welded together, wherein the first sleeve and the second sleeve are both copper tubes or copper alloy tubes.

[0022] According to some embodiments of the present invention, at least one of the branch pipes is a copper pipe or a copper alloy pipe.

[0023] A heating and ventilation device according to a second aspect of the present invention includes: a compressor and a heat exchanger, and a flute-shaped tube assembly according to the first aspect of the present invention, the flute-shaped tube assembly being connected between the compressor and the heat exchanger.

[0024] According to the HVAC device of the present utility model embodiment, by setting the above-mentioned flute-shaped tube assembly, on the one hand, the effect of the HVAC device can be improved and the reliability of the HVAC device during operation can be increased; on the other hand, the difficulty of the HVAC device production and design process can be reduced and the production efficiency can be improved.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a schematic diagram of a flute-shaped tube assembly according to an embodiment of the present utility model;

[0028] Figure 2 yes Figure 1 A partial schematic diagram of the flute-shaped tube assembly;

[0029] Figure 3 This is a schematic diagram of the cooperation between the branch pipe and the flange according to some embodiments of the present utility model;

[0030] Figure 4 This is a schematic diagram of the branch pipe and flange fitting according to other embodiments of the present invention;

[0031] Figure 5 This is a schematic diagram of the branch pipe and flange fitting according to some embodiments of the present utility model;

[0032] Figure 6 This is a schematic diagram of the connection between the main tube and the branch tube according to the first embodiment of the present utility model;

[0033] Figure 7 yes Figure 6 A magnified schematic diagram of a portion at point A shown in the image;

[0034] Figure 8 This is a schematic diagram of the connection between the branch pipe and the external piping according to the first embodiment of the present invention;

[0035] Figure 9 yes Figure 8 A magnified schematic diagram of a portion at point B shown in the image;

[0036] Figure 10 This is a schematic diagram of the connection between the main tube and the branch tube according to the second embodiment of the present utility model;

[0037] Figure 11 yes Figure 10 A magnified schematic diagram of a portion at point C shown in the image;

[0038] Figure 12 This is a schematic diagram of the connection between the branch pipe and the external piping according to the second embodiment of the present utility model;

[0039] Figure 13 yes Figure 12 A magnified schematic diagram of a portion at point D shown in the image;

[0040] Figure 14 This is a schematic diagram of the connection between the main tube and the branch tube according to the third embodiment of the present utility model;

[0041] Figure 15 yes Figure 14 A magnified schematic diagram of a portion at point E shown in the image.

[0042] Figure label:

[0043] 100. Flute tube assembly;

[0044] 10. Main tube; 11. First straight tube; 111. Flanged edge; 112. Connecting hole; 12. Second straight tube; 13. Bent tube;

[0045] 20. Branch pipe; 21. Annular protrusion; 22. Protrusion; 23. Contraction pipe;

[0046] 30. External connections; 31. External piping;

[0047] 41. First sleeve; 42. Second sleeve; 51. First solder; 52. Second solder; 53. Third solder; 54. Fourth solder. Detailed Implementation

[0048] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0049] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] The following is for reference. Figures 1-15 Describes a flute tube assembly 100 according to an embodiment of the present invention.

[0052] According to a first aspect embodiment of the present invention, a flute-shaped tube assembly 100 includes a main tube 10 and a plurality of branch tubes 20. The main tube 10 is provided with a plurality of connecting holes 112, which can be arranged at intervals along the length of the main tube 10. The intervals between the plurality of connecting holes 112 can be equal or unequal, depending on the specific application. The number of the plurality of branch tubes 20 is equal to the number of the plurality of connecting holes 112 and corresponds one-to-one. The plurality of branch tubes 20 are installed one-to-one at the connecting holes 112.

[0053] Wherein, the main pipe 10 is a flexible stainless steel pipe integrally formed; or, at least one branch pipe 20 is a flexible stainless steel pipe integrally formed, where at least one means one or more, that is, one or more branch pipes 20 are stainless steel pipes; or, the main pipe 10 and at least one branch pipe 20 are both flexible stainless steel pipes integrally formed, and one or more branch pipes 20 are flexible stainless steel pipes integrally formed, wherein the flexible stainless steel composition includes at least copper.

[0054] Specifically, the main pipe 10 is connected to the compressor of the HVAC system, and multiple branch pipes 20 are connected to the heat exchanger of the HVAC system. The main pipe 10 and the multiple branch pipes 20 are used to transport the refrigerant in the compressor to the heat exchanger. When the refrigerant flows in the main pipe 10 and the multiple branch pipes 20, the refrigerant impacts the main pipe 10 and the multiple branch pipes 20. At the same time, the compressor will vibrate when the HVAC system is working. In this application, by making the main pipe 10 and / or at least one branch pipe 20 a flexible stainless steel component, the high strength of the stainless steel pipe can withstand the higher intensity impact from the compressor and refrigerant, thereby improving the reliability of the flute tube assembly 100 during operation.

[0055] Flexible stainless steel is a copper-containing stainless steel. The presence of copper gives stainless steel better ductility and flexibility. This is because copper forms a fine, dispersed phase in stainless steel, which hinders the movement of dislocations and thus increases the yield strength of the material. In addition, appropriate amounts of copper can refine the grains and reduce defects at grain boundaries, thereby improving the toughness of the material. Furthermore, the addition of copper can also induce a martensitic phase transformation, thereby increasing the strength of stainless steel.

[0056] It is understandable that stainless steel pipes are easier to bend than conventional stainless steel pipes. In the design of HVAC systems, in order to make the structure of the HVAC system more compact and to ensure that the arrangement space of the flute-shaped pipe assembly 100 is not too large, in this application, by setting the main pipe 10 and / or at least one branch pipe 20 as a flexible stainless steel integrally formed stainless steel pipe, the bending limit of the stainless steel pipe is greater when it is bent. In this way, when the arrangement space changes during the design of the HVAC system, it is easier to arrange the stainless steel pipe in the arrangement space, thereby reducing the design difficulty of the HVAC system.

[0057] During the assembly of the flute tube assembly 100 onto the HVAC system, the operating space around the flute tube assembly 100 is often small. The stainless steel tube is easier to adjust during the assembly process, which reduces the operator's operating difficulty, thereby reducing assembly difficulty and improving assembly efficiency.

[0058] In addition, flexible stainless steel has strong chemical stability, and stainless steel pipes can better resist corrosion from the external environment during use, thus improving the service life of the flute tube assembly 100. Stainless steel pipes also have lower manufacturing costs, which can reduce the cost of the flute tube assembly 100.

[0059] Stainless steel pipes can be composed of the following components and their mass percentages: C: 0%–0.02%, Si: 0%–1%, Mn: 1%–2%, Cr: 16%–18%, Ni: 9%–11%, Cu: 2%–4%, Mo: 0%–0.03%, P: 0%–0.03%, and S: 0%–0.03%. The addition of Cu reduces the yield strength of the stainless steel pipe to 140 MPa–180 MPa, the tensile strength to 400 MPa–600 MPa, increases the elongation to 50%–80%, the yield strength ratio to less than 0.4, and the hardness to 100 Hv–120 Hv. The addition of Cr and Ni gives the stainless steel pipe a lower pitting corrosion potential, lower pitting corrosion weight loss, and a lower martensitic transformation temperature, making it more difficult for the stainless steel pipe to undergo martensitic phase transformation during processing, thus achieving stronger resistance to pitting corrosion and stress corrosion.

[0060] According to the embodiment of the present utility model, the flute tube assembly 100 can improve the reliability of the flute tube assembly 100 during operation by setting the main tube 10 and / or at least one branch tube 20 as a flexible stainless steel integrally formed stainless steel tube, and can reduce the design and assembly difficulty of the HVAC device and improve the assembly efficiency.

[0061] According to some embodiments of the present invention, the flexible stainless steel comprises at least copper and nickel, and the mass percentages of copper and nickel are as follows: Ni: 9-11% and Cu: 2-4%.

[0062] Nickel is a crucial element for stabilizing the austenitic structure, aiding in the formation and stabilization of the austenitic phase, which is fundamental to the excellent overall properties of stainless steel. The addition of nickel allows stainless steel to maintain good ductility and toughness at low temperatures. The presence of nickel helps improve the corrosion resistance of stainless steel, especially in chloride environments. Nickel can improve the cold working properties of stainless steel, making it easier to form. Nickel can enhance the high-temperature oxidation resistance and sulfidation resistance of stainless steel.

[0063] Copper can improve the corrosion resistance of stainless steel in certain environments, especially against acidic media such as sulfuric acid. The addition of copper can increase the mechanical strength of stainless steel and improve its wear resistance. Copper can form a stable protective film on the surface of stainless steel, which helps to improve its corrosion resistance. Copper has good electrical and thermal conductivity, which enhances the performance of stainless steel in these aspects. Copper also has certain antibacterial properties, which can inhibit bacterial growth to some extent.

[0064] In summary, when stainless steel contains both copper and nickel, the synergistic effect of these two elements can further improve the overall performance of stainless steel, including better corrosion resistance, higher mechanical strength, and better processing performance.

[0065] According to some embodiments of this utility model, refer to Figures 1-2 The main tube 10 is a flexible stainless steel tube integrally formed. The main tube 10 includes a first straight tube 11, a second straight tube 12 and a bent tube 13. The first straight tube 11, the second straight tube 12 and the bent tube 13 are integrally formed by the main tube 10. The bent tube 13 is connected between the first straight tube 11 and the second straight tube 12. Multiple branch tubes 20 are all connected to the first straight tube 11. The other end of the second straight tube 12 is connected to the compressor.

[0066] The main tube 10 is a one-piece molded component, which eliminates the need for the bending tube 13 to be installed between the first straight tube 11 and the second straight tube 12. It also simplifies the manufacturing process of the first straight tube 11, the second straight tube 12, and the bending tube 13, ensuring the connection strength between them. The main tube 10 is a one-piece molded flexible stainless steel tube. Stainless steel has lower yield strength and higher ductility, making the main tube 10 easier to bend. This also allows for a smaller bending radius for the bending tube 13 and reduces the likelihood of cracking on the outside and wrinkling on the inside of the bending tube 13.

[0067] According to some embodiments of this utility model, refer to Figures 1-2 The diameters of the first straight pipe 11 and the second straight pipe 12 are both d, and the bending radius of the bent pipe 13 is r, satisfying 1.2d≤r≤1.5d. The main pipe 10 is a flexible stainless steel pipe integrally formed, which allows the bent pipe 13 to obtain a lower bending radius. Moreover, the stainless steel pipe is stronger, has stronger resistance to vibration stress, and is not easy to crack due to vibration. This can reduce the number of bent pipes 13 set in the flute pipe assembly 100 to reduce vibration stress, thereby saving pipeline space and reducing the overall size of the machine.

[0068] For example, the diameter of the first straight pipe 11 and the second straight pipe 12 can be 15mm, and the bending radius of the bent pipe 13 can be in the range of 18mm-22.5mm, such as 18mm, 19mm, 20mm, 22mm or 22.5mm.

[0069] According to some embodiments of this utility model, an expansion tube is provided at the end of the second straight pipe 12 away from the bending pipe 13. The diameter of the expansion tube is larger than the diameter of the second straight pipe 12. An external connecting pipe 30 can extend into the expansion tube, and one end of the external connecting pipe 30 can abut against the bottom wall of the expansion tube to limit the installation position of the external connecting pipe 30 and the second straight pipe 12, facilitating the connection between the external connecting pipe 30 and one end of the second straight pipe 12. The external connecting pipe 30 can extend into the expansion tube, and the external connecting pipe 30 and the expansion tube can be fixed by welding. Stainless steel pipes have lower yield strength, lower hardness, and higher ductility, therefore the processing of the expansion tube is easier and allows for a higher flaring ratio.

[0070] According to some embodiments of this utility model, a retractable tube is provided at the end of the second straight tube 12 away from the bent tube 13. The diameter of the retractable tube is smaller than the diameter of the second straight tube 12. The retractable tube can extend into the outer connecting pipe 30, and one end of the outer connecting pipe 30 can abut against the bottom wall of the retractable tube to limit the installation position of the outer connecting pipe 30 and the second straight tube 12, facilitating the connection between the outer connecting pipe 30 and one end of the second straight tube 12. The retractable tube extends into the outer connecting pipe 30, and the outer connecting pipe 30 and the retractable tube can be fixed by welding. Stainless steel pipes have lower yield strength, lower hardness, and higher ductility, therefore the processing of the expansion tube is easier and allows for a lower necking rate.

[0071] According to some embodiments of this utility model, the expansion tube includes at least one sub-expansion tube. The expansion tube may include one sub-expansion tube or multiple sub-expansion tubes. When there are multiple sub-expansion tubes, they are connected sequentially. In the direction from the bent tube 13 to the second straight tube 12, the diameters of the multiple sub-expansion tubes increase sequentially. The diameter of the sub-expansion tube closer to the bent tube 13 is smaller than the diameter of the sub-expansion tube farther from the bent tube 13, causing the sub-expansion tubes to expand outwards sequentially. The external connector 30 can also retract correspondingly to the multiple sub-expansion tubes, allowing for better positioning of the external connector 30 and the second straight tube 12.

[0072] According to some embodiments of this utility model, the retraction tube includes at least one sub-retraction tube, which can be an expansion tube including one sub-retraction tube or an expansion tube including multiple sub-retraction tubes. When there are multiple sub-retraction tubes, the multiple sub-retraction tubes are connected sequentially, and the diameters of the multiple sub-retraction tubes decrease sequentially in the direction from the bend tube 13 to the second straight tube 12. The diameter of the sub-retraction tube closer to the bend tube 13 is larger than the diameter of the sub-retraction tube farther from the bend tube 13, so that the sub-retraction tubes retract inward sequentially. The external connector 30 can also expand correspondingly to the multiple sub-retraction tubes, which can better position the external connector 30 and the second straight tube 12.

[0073] According to some embodiments of this utility model, refer to Figures 1-5 The main tube 10 has an integrally formed flange 111, which eliminates the need for the flange 111 to be installed on the main tube 10, simplifies the process of manufacturing the flange 111, and ensures the connection strength between the flange 111 and the main tube 10. For example, if the main tube 10 is made of stainless steel, the flange 111 can be manufactured in one step. Stainless steel has lower yield strength and higher ductility, making it easier to manufacture the flange 111 on the main tube 10 and less prone to cracking on the outside and wrinkling on the inside of the flange 111.

[0074] The flange 111 is an annular ring surrounding the outer periphery of the connecting hole 112. The branch pipe 20 is inserted into the flange 111, which facilitates the welding and fixing of the branch pipe 20 and the flange 111.

[0075] According to some embodiments of this utility model, refer to Figures 1-5 The main tube 10 is made of stainless steel. A rounded chamfer is formed at the connection between the flange 111 and the main tube 10 to avoid stress concentration at this point. The radius of the rounded chamfer is less than 1.5 times the wall thickness of the main tube 10. In the radial direction of the main tube 10, the height of the flange 111 is greater than the wall thickness of the main tube 10. The main tube 10 is made of stainless steel, which has lower yield strength and higher ductility, allowing for the fabrication of higher flanges 111 and smaller rounded chamfers.

[0076] For example, the wall thickness of the main tube 10 is 1.2mm, and the radius of the rounded chamfer can be less than 1.8mm, such as 1.7mm, 1.6mm or 1.5mm; the height of the flange 111 is greater than 1.2mm, such as 1.3mm, 1.4mm or 1.5mm.

[0077] According to some embodiments of this utility model, refer to Figures 3-4The branch pipe 20 has a limiting part that cooperates with the flange 111 to limit the depth of insertion of the branch pipe 20 into the flange 111 and to position the installation position between the branch pipe 20 and the main pipe 10. For example, the limiting part can be a protrusion on the outer wall of the branch pipe 20, which can abut against the axial end face of the flange 111 when the branch pipe 20 is inserted into the flange 111.

[0078] According to some embodiments of this utility model, refer to Figures 3-4 The limiting part is a protrusion 22, which can be set on the outer wall of the branch pipe 20 or integrally formed on the branch pipe 20, simplifying the processing of the protrusion 22. When the branch pipe 20 is inserted into the flange 111, the protrusion 22 can abut against the axial end face of the flange 111 to limit the installation position between the branch pipe 20 and the main pipe 10. Multiple protrusions 22 can be provided, and multiple protrusions 22 can be spaced apart along the circumference of the branch pipe 20.

[0079] Alternatively, the limiting part is an annular protrusion 21 extending around the axis of the branch pipe 20. The annular protrusion 21 can be provided on the outer wall of the branch pipe 20; or the annular protrusion 21 can be integrally formed on the branch pipe 20, which simplifies the processing technology of the annular protrusion 21. When the branch pipe 20 is inserted into the flange 111, the annular protrusion 21 can abut against the axial end face of the flange 111 to limit the installation position between the branch pipe 20 and the main pipe 10.

[0080] According to some embodiments of this utility model, refer to Figure 5 A shrink tube 23 is provided at one end of the branch pipe 20 near the main pipe 10. The diameter of the shrink tube 23 is smaller than the diameter of the branch pipe 20. The shrink tube 23 is inserted into the flange 111. The shrink tube 23 can be inserted into the flange 111. The axial side wall of the shrink tube 23 can abut against the axial end face of the flange 111 to limit the depth of the branch pipe 20 inserted into the flange 111.

[0081] According to some embodiments of this utility model, refer to Figure 1 The yield strength of flexible stainless steel is 140–180 MPa; the tensile strength of flexible stainless steel is reduced to 400–600 MPa; and / or, the elongation of flexible stainless steel is 50–80%; the yield strength ratio of flexible stainless steel is less than 0.4; and / or, the hardness of flexible stainless steel material is 100–120 Hv.

[0082] For example, the yield strength of flexible stainless steel can be 140MPa, 150MPa, 160MPa, 170MPa or 180MPa, etc.; the tensile strength of flexible stainless steel can be 400MPa, 450MPa, 500MPa, 550MPa or 600MPa, etc.; the elongation of flexible stainless steel can be 50%, 60%, 70% or 80%, etc.; the hardness of flexible stainless steel can be 100Hv, 110Hv, 115Hv or 120Hv, etc.

[0083] According to some embodiments of this utility model, refer to Figure 1 Flexible stainless steel is composed of the following components by weight percentage: C: less than 0.02%, Si: 0.5%–1%, Mn: 1–2%, Cr: 16–18%, Ni: 9–11%, Cu: 2–4%, Mo: 0–0.02%, P: less than 0.03%, S: less than 0.03%, with the remainder consisting of Fe and unavoidable impurities. The addition of Cu reduces the yield strength of the flexible stainless steel to 140–180 MPa, the tensile strength to 400–600 MPa, increases the elongation to 50%–80%, the yield strength ratio to less than 0.4, and the hardness to 100 Hv–120 Hv. The addition of Cr and Ni gives the flexible stainless steel a lower pitting corrosion potential, lower pitting corrosion weight loss, and lower martensitic transformation temperature, making it more difficult for the flexible stainless steel to undergo martensitic phase transformation during processing, thus achieving stronger resistance to pitting corrosion and stress corrosion.

[0084] It should be further explained that the flexible stainless steel material involved in this utility model has a lower C element content, which makes it more difficult for it to pass through the material sensitization range during hot working and welding, effectively controlling the formation of M23C6, thereby achieving stronger resistance to intergranular corrosion and effectively reducing welding defects.

[0085] According to some embodiments of this utility model, refer to Figure 1The Md30 of flexible stainless steel ranges from -50℃ to -80℃. For example, the Md30 of flexible stainless steel can be -50℃, 60℃, 70℃, or 80℃. In the field of flexible stainless steel materials, "Md30" refers to the critical temperature for martensitic transformation. Specifically, "Md30" is the temperature at which 50% martensite is formed when 30% deformation occurs. This parameter is crucial for predicting the behavior of flexible stainless steel during processing because martensite formation affects the material's hardness and magnetism. Generally, the lower the "Md30" value, the less likely the material is to form martensite under the same deformation conditions. Therefore, the material has stronger resistance to aging cracking, meaning it is less prone to cracking. Conversely, if the "Md30" value is high, the material is more likely to form martensite during processing, which may lead to cracking. Therefore, by ensuring that the critical temperature for martensitic transformation of the flexible stainless steel meets the above conditions, the refrigerant transport module 100 can operate well in low-temperature environments with good stability.

[0086] According to some embodiments of this utility model, refer to Figure 1 Flexible stainless steel is an austenitic stainless steel with an average grain size of 20μm to 40μm. For example, the specific average grain size of flexible stainless steel can be 20μm, 25μm, 30μm, 35μm, or 40μm. Therefore, austenitic flexible stainless steel with a grain size of 20μm to 40μm not only maintains the inherent good corrosion resistance and processability of austenitic stainless steel, but also achieves superior mechanical properties and a potentially longer service life due to its refined grain size.

[0087] According to some embodiments of this utility model, refer to Figure 1 The wall thickness of stainless steel pipes ranges from 1.2mm to 1.5mm. Stainless steel has high strength, strong chemical stability, and a low yield strength, allowing for thinner pipe walls. For example, the wall thickness can be 1.2mm, 1.3mm, 1.4mm, or 1.5mm, etc.

[0088] According to some embodiments of this utility model, refer to Figures 1-15Both the main pipe 10 and the branch pipe 20 are integrally formed flexible stainless steel pipes, and are welded together by a first solder 51. An external pipe 31 is connected to the end of the branch pipe furthest from the main pipe 10. Both the branch pipe 20 and the external pipe 31 are integrally formed flexible stainless steel pipes, and are welded together by a first solder 51. The first solder 51 contains, by weight (wt%), Cu: 46%–50%, Ni: 9%–11%, Si: 0.04%–0.25%, with the remainder consisting of Zn and unavoidable impurities. The flux used when using the first solder 51 contains, by weight (wt%), 60%–80% boric acid, 5%–15% fluoride, and 10%–20% potassium borate. The melting temperature t1 when using the first solder 51 satisfies: 910℃ ≤ t1 ≤ 935℃. The brazing temperature t2 when using the first solder 51 satisfies: 950℃ ≤ t2 ≤ 975℃.

[0089] Specifically, for brazing, flame welding or high-frequency welding technology can be selected, which results in a wider welding activity range, less post-weld residue, stronger corrosion resistance and better reliability at the weld, and a significant reduction in welding costs; the welding temperature requirement is low, making it less likely to burn the base material; the solder has good fluidity and filling properties, allowing for more relaxed requirements on pipe diameter and fitting clearance, high stability and strong reliability; and it does not require an ammonia decomposition furnace, thus requiring lower processing precision.

[0090] The main pipe 10 and the branch pipe 20 can be directly welded, as can the branch pipe and the external piping 31. The welding of the main pipe 10 and the branch pipe 20, and the welding of the branch pipe and the external piping 31, can be performed using brazing or fusion welding techniques with the first solder 51 and flux. For brazing, flame welding or high-frequency welding techniques can be selected, using flux, which has a wider activity range and less residue after welding. For fusion welding, argon arc welding techniques can be selected, with the weld position 0cm to 2cm from the interface, a weld width of 2mm to 10mm, and a weld strength not less than 80% of the base material. This technique has more lenient requirements regarding weld position and weld area size.

[0091] According to some embodiments of this utility model, refer to Figures 1-15 One of the main pipe 10 and the branch pipe 20 is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe. The main pipe 10 and the branch pipe 20 are welded together by a second solder 52. The end of the branch pipe 20 away from the main pipe 10 is connected to an external pipe 31. One of the branch pipe 20 and the external pipe 31 is a flexible stainless steel pipe integrally formed, and the other is a copper pipe or a copper alloy pipe. The branch pipe 20 and the external pipe 31 are welded together by a second solder 52.

[0092] The second solder 52 contains, by weight (wt%), Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder consisting of Zn and unavoidable impurities; the flux used when using the second solder 52 contains, by weight (wt%), 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate; the melting temperature t3 when using the second solder 52 satisfies: 880℃≤t1≤890℃; the brazing temperature t4 when using the second solder 52 satisfies: 920℃≤t2≤930℃.

[0093] It is understandable that when the main pipe 10, branch pipe 20 and external piping 31 are made of different materials, the solder required for welding the main pipe 10 and branch pipe 20, and for welding the branch pipe 20 and external piping 31 will also be different.

[0094] Flexible stainless steel is a type of flexible stainless steel material with high ductility and flexibility. It can adapt to complex shape changes and bending requirements without losing its corrosion resistance and mechanical strength. Even after a complex forming process, it can still maintain good mechanical strength and compressive strength. Flexible stainless steel is easy to process by bending, welding and connecting.

[0095] According to some embodiments of this utility model, refer to Figures 1-15 The main pipe 10 is welded to the connection hole with a first sleeve 41 and the branch pipe 20 is welded to the end with a second sleeve 42. The first sleeve 41 and the second sleeve 42 are welded together and welded to each other by a third solder 53 or a fourth solder 54. The first sleeve 41 and the second sleeve 42 are both copper pipes or copper alloy pipes; the third solder 53 is tin bronze solder; and the fourth solder 54 is silver copper solder.

[0096] According to some embodiments of this utility model, refer to Figure 1 Figure 15 The branch pipe 20, at the end furthest from the main pipe 10, is welded with an external sleeve. This external sleeve is made of copper or a copper alloy. Through the bridging effect of the external sleeve and by adjusting its model, it can be adapted to the external piping 31, enabling the connection between the branch pipe 20 and different models of external sleeves, thus reducing product design complexity. When the flute-shaped pipe assembly 100 is assembled onto equipment, the external piping 31 connects to components on the equipment. During product design, the size or shape of the external piping 31 can be adjusted, allowing the flute-shaped pipe assembly 100 to adapt to more equipment models. For example, when the flute-shaped pipe assembly 100 is applied to a heating, ventilation, and air conditioning (HVAC) system, the external piping 31 can be connected between the branch pipe 20 and the heat exchanger.

[0097] One branch pipe 20 is made of stainless steel, while the other branch pipes 20 are made of copper or copper alloy. An external sleeve is welded to the end of the branch pipe 20 away from the main pipe 10 to solve the problem of difficult welding and connection between the branch pipe 20 and the external piping 31.

[0098] Multiple branch pipes 20 are made of stainless steel, while the remaining branch pipes 20 are made of copper or copper alloy. An external sleeve is welded to the end of the branch pipe 20 away from the main pipe 10 to solve the problem of difficult welding and connection between the branch pipe 20 and the external piping 31.

[0099] All branch pipes 20 are made of stainless steel. An external sleeve is welded to the end of the branch pipe 20 away from the main pipe 10 to solve the problem of difficult welding and connection between the branch pipe 20 and the external piping 31.

[0100] The branch pipe 20 is welded to the external piping 31 using brazing technology with solder and flux. For brazing technology, flame welding or high-frequency welding can be selected, which has a wider active range and less residue after welding. The welding temperature is 30℃~90℃ lower than the solder in related technologies, which is less likely to burn the base material; the solder has good fluidity and better filling, and the requirements for the pipe diameter of the branch pipe 20 and the fitting clearance between the branch pipe 20 and the connecting hole 112 are more relaxed; the gap machining accuracy requirement for furnace welding in related technologies is 40μm~50μm, while the gap machining accuracy requirement for flame welding in this application is 150μm.

[0101] According to some embodiments of this utility model, refer to Figure 1 A first sleeve 41 is welded to the connection hole 112 of the main pipe 10, and a second sleeve 42 is welded to the end of the branch pipe 20. The first sleeve 41 and the second sleeve 42 are welded together. The first sleeve is a copper pipe or a copper alloy pipe, and the second sleeve 42 is a copper pipe or a copper alloy pipe.

[0102] When the main pipe 10 is manufactured, a first sleeve is welded at the connection hole 112 of the main pipe 10, and a second sleeve 42 is welded at the end of the branch pipe 20. When transported to the downstream production site, the branch pipe 20 can be welded to the main pipe 10 by welding the first sleeve 41 and the second sleeve 42, which can improve the compatibility between the branch pipe 20 and the main pipe 10.

[0103] The main pipe 10 is made of stainless steel, and the multiple branch pipes 20 are made of copper or copper alloy. A first sleeve 41 is welded to the connection hole 112 of the main pipe 10, and a second sleeve 42 is welded to the end of the branch pipe 20. By welding the first sleeve 41 and the second sleeve 42 together, the branch pipe 20 can be welded to the connection hole 112 of the main pipe 10, thus solving the problem of difficult welding and connection between steel pipes and copper pipes.

[0104] The main pipe 10 is made of stainless steel, one branch pipe 20 is made of stainless steel, and the remaining branch pipes 20 are made of copper or copper alloy. A first sleeve 41 is welded to the connection hole 112 of the main pipe 10, and a second sleeve 42 is welded to the end of the branch pipe 20. By welding the first sleeve 41 and the second sleeve 42 together, the branch pipe 20 can be connected to the main pipe 10, thus solving the problem of difficult welding and connection between steel pipes and copper pipes.

[0105] According to some embodiments of this utility model, refer to Figure 1 At least one branch pipe 20 is made of copper or copper alloy. It can be one or more branch pipes 20 made of copper, which can reduce the weight of the branch pipe 20. In addition, copper or copper alloy pipes have high chemical stability, which can improve the service life of the branch pipe 20. During the product design process, the appropriate material of the branch pipe 20 can be selected according to the connection requirements, thereby meeting more product design needs.

[0106] A heating and ventilation device according to a second aspect of the present invention includes a compressor and a heat exchanger, and a flute tube assembly 100 according to the first aspect of the present invention, wherein the flute tube assembly 100 is connected between the compressor and the heat exchanger.

[0107] During the operation of the HVAC system, refrigerant enters the compressor, which compresses the refrigerant. The compressed refrigerant then enters the main pipe 10 and is transported to the heat exchanger via the branch pipe 20 connected to the main pipe 10. The heat exchanger then exchanges heat with the refrigerant.

[0108] According to the HVAC device of the present utility model embodiment, by setting the above-mentioned flute tube assembly 100, on the one hand, the effect of the HVAC device can be improved and the reliability of the HVAC device during operation can be increased; on the other hand, the difficulty of the HVAC device production and design process can be reduced and the production efficiency can be improved.

[0109] The following reference Figures 1-8 This invention describes a flute tube assembly 100 and a heating and ventilation device having the same according to one embodiment of the present invention.

[0110] The HVAC system includes a compressor and a heat exchanger, with a flute tube assembly 100 connecting the compressor and the heat exchanger.

[0111] The flute-shaped tube assembly 100 includes a main tube 10 and multiple branch tubes 20. The main tube 10 includes an integrally formed first straight tube 11, a second straight tube 12, and a bent tube 13, with the bent tube 13 connecting the first straight tube 11 and the second straight tube 12. The diameter of both the first straight tube 11 and the second straight tube 12 is 15 mm, and the bending radius of the bent tube 13 can be in the range of 18 mm to 22.5 mm.

[0112] The first straight pipe 11 has multiple connecting holes 112, and multiple branch pipes 20 are installed at the connecting holes 112 one by one. A flange 111 is integrally formed on the first straight pipe 11. The flange 111 is annular around the outer periphery of the connecting holes 112, and the branch pipes 20 are inserted into the flange 111. A rounded chamfer is formed at the connection between the flange 111 and the first straight pipe 11. The wall thickness of the main pipe 10 is 1.2mm, and the radius of the rounded chamfer can be less than 1.8mm, such as 1.7mm, 1.6mm, or 1.5mm; the height of the flange 111 is greater than 1.2mm, such as 1.3mm, 1.4mm, or 1.5mm.

[0113] The branch pipe 20 has a limiting part, which is either a protrusion 22 or an annular protrusion 21 extending around the axis of the branch pipe 20. When the branch pipe 20 is inserted into the flange 111, the protrusion 22 or the annular protrusion 21 is used to limit the depth of insertion of the branch pipe 20 into the flange 111, and to position the installation position between the branch pipe 20 and the main pipe 10. A shrink tube 23 is provided at one end of the branch pipe 20 near the main pipe 10. The diameter of the shrink tube 23 is smaller than the diameter of the branch pipe 20. The shrink tube 23 is inserted into the flange 111. The axial sidewall of the shrink tube 23 can abut against the axial end face of the flange 111, which is used to limit the depth of insertion of the branch pipe 20 into the flange 111.

[0114] An expansion tube or a retraction tube is provided at the end of the second straight pipe 12 away from the bend pipe 13. The diameter of the expansion tube is larger than the diameter of the second straight pipe 12, and the diameter of the retraction tube is smaller than the diameter of the second straight pipe 12. The expansion tube includes multiple sub-expansion tubes, which are connected in sequence. In the direction from the bend pipe 13 to the second straight pipe 12, the diameters of the multiple sub-expansion tubes increase sequentially. The retraction tube includes multiple sub-retraction tubes, which are connected in sequence. In the direction from the bend pipe 13 to the second straight pipe 12, the diameters of the multiple sub-retraction tubes decrease sequentially.

[0115] The main pipe 10 is made of stainless steel, and the multiple branch pipes 20 are also made of stainless steel. The main pipe 10 can be directly welded to the multiple branch pipes 20.

[0116] The main pipe 10 is made of stainless steel, while the multiple branch pipes 20 are all made of copper or copper alloy. A first sleeve 41 is welded to the connection hole 112 of the main pipe 10, and a second sleeve 42 is welded to the end of each branch pipe 20. The first sleeve 41 and the second sleeve 42 are welded together. The first sleeve 41 and the second sleeve 42 are both made of copper or copper alloy. By welding the first sleeve 41 and the second sleeve 42, the main pipe 10 and the multiple branch pipes 20 are fixedly connected, thus solving the problem of difficult welding and connection between steel pipes and copper pipes.

[0117] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0118] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A flute-shaped tube assembly, characterized in that, include: The main tube has multiple connection holes. Branch pipes are provided in multiple ways, and the multiple branch pipes are installed one-to-one at the connection holes. The main pipe is a flexible stainless steel pipe integrally formed, and / or at least one of the branch pipes is the flexible stainless steel pipe integrally formed.

2. The flute-shaped tube assembly according to claim 1, characterized in that, The main tube is a stainless steel tube integrally formed from flexible stainless steel. The main tube includes an integrally formed first straight tube, a second straight tube, and a bent tube. The bent tube is connected between the first straight tube and the second straight tube, and multiple branch tubes are all connected to the first straight tube.

3. The flute-shaped tube assembly according to claim 2, characterized in that, The diameters of the first straight pipe and the second straight pipe are both d, and the bending radius of the bent pipe is r, satisfying 1.2d≤r≤1.5d.

4. The flute-shaped tube assembly according to claim 2, characterized in that, An expansion tube is provided at the end of the second straight tube away from the bend tube, the diameter of the expansion tube being larger than the diameter of the second straight tube; and / or, a retraction tube is provided at the end of the second straight tube away from the bend tube, the diameter of the retraction tube being smaller than the diameter of the second straight tube.

5. The flute-shaped tube assembly according to claim 4, characterized in that, The expansion tube includes at least one sub-expansion tube. When there are multiple sub-expansion tubes, the multiple sub-expansion tubes are connected in sequence, and the diameters of the multiple sub-expansion tubes increase in sequence in the direction from the bend tube to the second straight tube; and / or, the retraction tube includes at least one sub-retraction tube. When there are multiple sub-retraction tubes, the multiple sub-retraction tubes are connected in sequence, and the diameters of the multiple sub-retraction tubes decrease in sequence in the direction from the bend tube to the second straight tube.

6. The flute-shaped tube assembly according to claim 1, characterized in that, The main tube has an integrally formed flange, which is an annular ring surrounding the outer periphery of the connecting hole, and the branch tube is inserted into the flange.

7. The flute-shaped tube assembly according to claim 6, characterized in that, The main tube is a one-piece stainless steel tube. A rounded chamfer is formed at the connection between the flange and the main tube. The radius of the rounded chamfer is less than 1.5 times the wall thickness of the main tube. In the radial direction of the main tube, the height of the flange is greater than the wall thickness of the main tube.

8. The flute-shaped tube assembly according to claim 6, characterized in that, The branch pipe has a limiting part that cooperates with the flange limiting part.

9. The flute-shaped tube assembly according to claim 8, characterized in that, The limiting part is a convex hull or an annular protrusion extending around the axis of the branch pipe.

10. The flute-shaped tube assembly according to claim 6, characterized in that, The branch pipe has a shrink tube at one end near the main pipe. The diameter of the shrink tube is smaller than that of the branch pipe, and the shrink tube is inserted into the flange.

11. The flute assembly according to any one of claims 1-10, characterized in that, The yield strength of the flexible stainless steel is 140-180 MPa; and / or, the tensile strength of the flexible stainless steel is reduced to 400-600 MPa; and / or, the elongation of the stainless steel is 50-80%; and / or, the yield strength ratio of the flexible stainless steel is less than 0.4; and / or, the hardness of the flexible stainless steel material is 100-120 Hv.

12. The flute assembly according to any one of claims 1-10, characterized in that, The Md30 of the flexible stainless steel is -50℃ to -80℃.

13. The flute assembly according to any one of claims 1-10, characterized in that, The flexible stainless steel is austenitic stainless steel, and the average grain size of the stainless steel is 20μm to 40μm.

14. The flute assembly according to any one of claims 1-10, characterized in that, The wall thickness of the stainless steel pipe is 1.2mm to 1.5mm.

15. The flute assembly according to any one of claims 1-10, characterized in that, Both the main pipe and the branch pipe are integrally formed stainless steel pipes of the flexible stainless steel; and / or, The branch pipe is connected to an external piping at the end furthest from the main pipe, and both the branch pipe and the external piping are integrally formed stainless steel pipes made of flexible stainless steel.

16. The flute assembly according to any one of claims 1-10, characterized in that, One of the main pipe and the branch pipe is a stainless steel pipe integrally formed from the flexible stainless steel, and the other is a copper pipe or a copper alloy pipe; and / or, The branch pipe is connected to an external pipe at the end away from the main pipe. One of the branch pipe and the external pipe is a stainless steel pipe integrally formed from flexible stainless steel, and the other is a copper pipe or a copper alloy pipe.

17. The flute assembly according to any one of claims 1-10, characterized in that, A first sleeve is welded to the connecting hole of the main pipe, and a second sleeve is welded to the end of the branch pipe. Both the first sleeve and the second sleeve are copper tubes or copper alloy tubes.

18. The flute-shaped tube assembly according to claim 1, characterized in that, At least one of the branch pipes is a copper pipe or a copper alloy pipe.

19. A heating, ventilation, and air conditioning (HVAC) device, characterized in that, include: A compressor and a heat exchanger, a flute tube assembly according to any one of claims 1-18, the flute tube assembly being connected between the compressor and the heat exchanger.

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