Gas-liquid separator and heating and ventilation device having the same

Abstract

The utility model discloses a kind of gas-liquid separator and heating and ventilation device with it, the gas-liquid separator includes: jar body, the jar body has accommodating cavity;Connecting pipe, the connecting pipe is communicated with the accommodating cavity and one end is stretched out the accommodating cavity, at least the part of the connecting pipe that stretches out the accommodating cavity is stainless steel pipe made of flexible stainless steel.According to the gas-liquid separator of the utility model, by at least the part of connecting pipe that stretches out accommodating cavity is set to stainless steel pipe made of flexible stainless steel, can avoid the use of copper connecting pipe in gas-liquid separator, connecting pipe can be directly welded with the pipeline joint of external pipeline using silver solder, so that the processing cost and welding cost of gas-liquid separator are reduced very well, so that gas-liquid separator can be conveniently connected with external pipeline.

Description

Technical Field

[0001] This utility model relates to the field of heating, ventilation and air conditioning (HVAC) technology, and in particular to a gas-liquid separator and an HVAC device having the same. Background Technology

[0002] As one of the core refrigeration components of HVAC systems, the gas-liquid separator's main function is to separate pure gaseous refrigerant before it enters the compressor, protecting it and preventing mechanical damage. In actual production, if the gas-liquid separator uses steel pipes for its piping system, copper connecting pipes are needed for connection to external piping, increasing costs and complicating production. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a gas-liquid separator that can be directly connected to external pipelines, avoiding the use of copper connecting pipes, reducing the cost of the gas-liquid separator, and making its production more convenient.

[0004] This utility model also proposes a heating and ventilation device having the above-mentioned gas-liquid separator.

[0005] According to a first aspect of the present invention, a gas-liquid separator includes: a tank having a receiving cavity; a connecting pipe communicating with the receiving cavity and having one end extending out of the receiving cavity, wherein at least the portion of the connecting pipe extending out of the receiving cavity is a stainless steel pipe made of flexible stainless steel.

[0006] According to the present invention, the gas-liquid separator can avoid the use of copper pipes in the gas-liquid separator by setting the portion of the connecting pipe extending out of the receiving cavity as a stainless steel pipe made of flexible stainless steel. The connecting pipe can be directly welded to the pipe joint of the external pipeline using silver-free solder, thereby greatly reducing the processing cost and welding cost of the gas-liquid separator and making it easy to connect the gas-liquid separator to the external pipeline.

[0007] In some embodiments of this utility model, the connecting pipe is a stainless steel pipe made of the flexible stainless steel.

[0008] In some embodiments of this utility model, the tank body is provided with a perforation, and a connecting flange is formed on the periphery of the end of the perforation opposite to the receiving cavity. The connecting pipe passes through the perforation into the receiving cavity, and the outer peripheral surface of the connecting pipe is sealed to the inner wall surface of the perforation and the inner peripheral surface of the connecting flange.

[0009] In some embodiments of this utility model, there are multiple connecting pipes, at least one of which is formed as an air inlet pipe. The gas-liquid separator also includes a guide pipe, which is disposed in the receiving cavity. One end of the guide pipe is connected to the air inlet pipe, and the other end of the guide pipe communicates with the receiving cavity and extends along an arc.

[0010] In one embodiment of this utility model, the guide tube is a stainless steel tube made of the flexible stainless steel.

[0011] In some embodiments of this utility model, there are multiple connecting pipes, at least one of which is formed as an air outlet pipe. The air outlet pipe extends vertically. The gas-liquid separator also includes a U-shaped pipe. The U-shaped pipe is disposed in the receiving cavity with its opening facing upward. One end of the U-shaped pipe is connected to the air outlet pipe, and the other end of the U-shaped pipe extends to the upper part of the receiving cavity and communicates with the receiving cavity.

[0012] In one embodiment of this utility model, the U-shaped tube is provided with an oil return hole, which is connected to the receiving cavity.

[0013] In one embodiment of this utility model, the U-shaped tube is a stainless steel tube made of the flexible stainless steel.

[0014] In one embodiment of this utility model, the diameter of the U-shaped tube is d, and the bending radius of the U-shaped tube is r, satisfying 1.2d≤r≤1.5d.

[0015] In some embodiments of this utility model, the yield strength of the flexible stainless steel is 140MPa to 180MPa; and / or, the tensile strength of the flexible stainless steel is reduced to 400MPa to 600MPa; and / or, the elongation of the flexible stainless steel is 50% to 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 100Hv to 120Hv.

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

[0017] In some embodiments of this utility model, the flexible stainless steel is austenitic stainless steel, and the average grain size of the flexible stainless steel is 20μm to 40μm.

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

[0019] The HVAC device according to the second aspect of the present invention includes: a pipe joint and a gas-liquid separator according to the first aspect of the present invention, wherein the pipe joint is plugged into the connecting pipe.

[0020] According to the HVAC device of this utility model, by setting the gas-liquid separator of the first aspect above, and by setting the part of the connecting pipe extending out of the receiving cavity as a stainless steel pipe made of flexible stainless steel, the use of copper pipe in the gas-liquid separator can be avoided. The connecting pipe can be directly welded to the pipe joint of the external pipeline using silver-free solder, thereby greatly reducing the processing cost and welding cost of the gas-liquid separator, and making it easy to connect the gas-liquid separator to the external pipeline.

[0021] In some embodiments of this utility model, the outer peripheral surface of the pipe joint is provided with a limiting protrusion, which abuts against the end face of the connecting pipe; or, the inner peripheral surface of the connecting pipe is provided with a limiting protrusion, which abuts against the end face of the pipe joint.

[0022] In one embodiment of this utility model, both the pipe joint and the connecting pipe are made of flexible stainless steel, and the pipe joint and the connecting pipe are welded together.

[0023] In one embodiment of this utility model, the pipe joint is a copper pipe or a copper alloy pipe, the connecting pipe is the stainless steel pipe, and the pipe joint is welded to the connecting pipe.

[0024] In one embodiment of this utility model, the pipe joint is welded with a first sleeve, and the connecting pipe is welded with a second sleeve. The first sleeve and the second sleeve are welded together by a third solder or a fourth solder. The first sleeve is a copper sleeve or a copper alloy sleeve; the second sleeve is a copper sleeve or a copper alloy sleeve; the third solder is tin bronze solder; and the fourth solder is silver copper solder.

[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] Figure 1 This is a schematic diagram of a gas-liquid separator according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the gas-liquid separator according to an embodiment of the present invention from another angle;

[0028] Figure 3 This is a cross-sectional view of a gas-liquid separator according to an embodiment of the present invention;

[0029] Figure 4 This is a cross-sectional view of the gas-liquid separator and pipeline connector according to an embodiment of the present utility model;

[0030] Figure 5 This is a schematic diagram of the connection between the connecting pipe and the external pipeline according to the first embodiment of the present utility model;

[0031] Figure 6 yes Figure 5 A magnified schematic diagram of a portion at point A shown in the image;

[0032] Figure 7 This is a schematic diagram of the connection between the connecting pipe and the external pipeline according to the second embodiment of the present utility model;

[0033] Figure 8 yes Figure 7 A magnified schematic diagram of a portion at point B shown in the image;

[0034] Figure 9 This is a schematic diagram of the connection between the connecting pipe and the external pipeline according to the third embodiment of the present utility model;

[0035] Figure 10 yes Figure 9 A magnified schematic diagram of a portion at point C shown in the image;

[0036] Figure 11 This is a schematic diagram of a heating, ventilation and air conditioning device according to an embodiment of the present utility model.

[0037] Figure label:

[0038] 10. Gas-liquid separator;

[0039] 11. Tank body; 111. Perforation; 112. Connecting flange; 113. Receiving cavity;

[0040] 12. Connecting pipe; 121. Inlet pipe; 122. Outlet pipe;

[0041] 13. Guide pipe; 14. U-shaped pipe; 141. Oil return hole;

[0042] 20. Pipe joint; 30. First sleeve; 40. Second sleeve; 51. First solder; 52. Second solder; 53. Third solder; 54. Fourth solder;

[0043] 60. Compressor; 70. Four-way valve;

[0044] 100. Heating, ventilation and air conditioning (HVAC) systems. Detailed Implementation

[0045] 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 intended to explain this utility model, and should not be construed as limiting this utility model.

[0046] First, refer to Figures 1-11 A brief description of the heating and ventilation device 100 according to a second aspect embodiment of the present invention is provided. The heating and ventilation device 100 is provided with a pipe joint 20 and a gas-liquid separator 10, and the pipe joint 20 is connected to the pipe of the gas-liquid separator 10.

[0047] The following is for reference. Figures 1-11 A gas-liquid separator 10 according to a first aspect embodiment of the present invention is described.

[0048] like Figures 1-11 As shown, the gas-liquid separator 10 according to a first aspect embodiment of the present invention includes: a tank 11 and a connecting pipe 12. The tank 11 has a receiving cavity 113; the connecting pipe 12 communicates with the receiving cavity 113 and one end extends out of the receiving cavity 113, and at least the portion of the connecting pipe 12 extending out of the receiving cavity 113 is a stainless steel pipe made of flexible stainless steel.

[0049] In this embodiment, at least the portion of the connecting pipe 12 extending out of the receiving cavity 113 is made of flexible stainless steel. The flexible stainless steel is copper-containing stainless steel, which gives the stainless steel better ductility and flexibility. This is because copper forms a fine dispersed phase in the stainless steel, which hinders the movement of dislocations, thereby increasing the yield strength of the material. In addition, appropriate copper can refine the grains and reduce defects at the 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 the stainless steel. As a result, the connecting pipe can have high ductility and low yield strength, so that the connecting pipe 12 can have processing performance close to that of copper pipes and mechanical properties superior to those of copper pipes. The connecting pipe 12 and the pipe joint 20 can be directly connected by brazing, thereby avoiding the use of copper pipes and greatly reducing the material cost of the gas-liquid separator 10.

[0050] Understandably, external pipelines are usually made of copper fittings. When the connecting pipe 12 of the gas-liquid separator 10 is made of conventional flexible stainless steel, it is difficult to directly weld the connecting pipe 12 to the external pipeline. It is necessary to add a copper connecting pipe. The copper connecting pipe and the connecting pipe 12 need to be welded with silver-containing solder, which makes the welding cost higher.

[0051] In this embodiment, at least the portion of the connecting pipe 12 extending out of the receiving cavity 113 is made of flexible stainless steel, which can be easily and directly welded to the pipe joint 20. Specifically, when the pipe joint 20 is a copper fitting, the connecting pipe 12 can be welded to the pipe joint 20 using silver-free solder, making it easier and more convenient to assemble the gas-liquid separator 10 in the HVAC system 100 and reducing welding costs.

[0052] In this embodiment, at least the portion of the connecting pipe 12 extending out of the receiving cavity 113 is made of flexible stainless steel. Some sections of the connecting pipe 12 can be made of flexible stainless steel while other sections can be made of other materials. The entire section of the connecting pipe 12 can also be made of flexible stainless steel.

[0053] According to the embodiment of the present invention, the gas-liquid separator 10, by setting at least the portion of the connecting pipe 12 extending out of the receiving cavity 113 as a stainless steel pipe made of flexible stainless steel, can avoid the use of copper pipe in the gas-liquid separator 10. The connecting pipe 12 can be directly welded to the pipe joint 20 of the external pipeline using silver-free solder, thereby greatly reducing the processing cost and welding cost of the gas-liquid separator 10, and making it easy to connect the gas-liquid separator 10 to the external pipeline.

[0054] In some embodiments of this utility model, the flexible stainless steel may include at least copper and nickel, and the mass percentages of copper and nickel are as follows: Ni: 9-11% and Cu: 2-4%.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] In some embodiments of this utility model, the connecting pipe 12 can be a stainless steel pipe made of flexible stainless steel.

[0059] In this embodiment, the entire connecting pipe 12 is made of flexible stainless steel, which has a simple structure, making it easy to process and shape, and giving it excellent material mechanical properties. The connecting pipe 12 has good structural strength and toughness, and can effectively withstand high-frequency vibrations caused by fluid impact in the pipeline system, thus enabling the gas-liquid separator 10 to operate more stably. Making the connecting pipe 12 of flexible stainless steel also improves its corrosion resistance and reduces scale buildup, allowing for more stable and efficient airflow delivery.

[0060] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the tank body 11 may be provided with a perforation 111. A connecting flange 112 is formed on the periphery of the end of the perforation 111 that is away from the receiving cavity 113. The connecting pipe 12 passes through the perforation 111 into the receiving cavity 113. The outer peripheral surface of the connecting pipe 12 is sealed to the inner wall surface of the perforation 111 and the inner peripheral surface of the connecting flange 112.

[0061] In this embodiment, a connecting flange 112 is formed around the periphery of the end of the perforation 111 facing away from the receiving cavity 113. This flange can cooperate with the inner wall surface of the perforation 111 to form a longer connecting mating surface in the penetrating direction of the perforation 111. This allows the connecting pipe 12 passing through the perforation 111 to be connected to the tank 11 more stably and reliably. The outer peripheral surface of the connecting pipe 12 is sealed to the inner wall surface of the perforation 111, and the outer peripheral surface of the connecting pipe 12 is sealed to the inner peripheral surface of the connecting flange 112. This allows the connecting pipe 12 to form a good sealing connection structure with the tank 11 at the perforation 111, thereby ensuring the sealing performance of the receiving cavity 113 and enabling the gas-liquid separator 10 to operate stably.

[0062] In some embodiments of this utility model, such as Figure 3 As shown, there can be multiple connecting pipes 12, and at least one of the multiple connecting pipes 12 is formed as an air inlet pipe 121. The gas-liquid separator 10 may also include a guide pipe 13, which is disposed in the receiving cavity 113. One end of the guide pipe 13 is connected to the air inlet pipe 121, and the other end of the guide pipe 13 is connected to the receiving cavity 113 and extends along an arc.

[0063] In this embodiment, multiple connecting pipes 12 are provided, at least one of which is formed as an air inlet pipe 121, which can meet the air intake requirements of the gas-liquid separator 10. The gas-liquid separator 10 is provided with a guide pipe 13, which is set in the receiving cavity 113 and one end is connected to the air inlet pipe 121. The structure is simple and easy to assemble. The other end of the guide pipe 13 is connected to the receiving cavity 113 and extends along an arc, which can slow down the flow and reduce the flow velocity of the airflow flowing in from the air inlet pipe 121. When the airflow flows into the receiving cavity 113 from the guide pipe 13, the flow velocity decreases, so that the liquid refrigerant and oil in the airflow can fall more fully and converge to the bottom of the receiving cavity 113 under the action of gravity, so that the gas-liquid separator 10 can obtain a good separation effect.

[0064] In one embodiment of this utility model, the guide tube 13 can be a stainless steel tube made of flexible stainless steel.

[0065] In this embodiment, the guide tube 13 is made of flexible stainless steel, which has a simple structure and is easy to process and shape. The guide tube 13 has good structural strength and toughness, and can effectively withstand the high-frequency vibration caused by fluid impact in the guide tube 13, thereby enabling the gas-liquid separator 10 to operate more stably. Making the guide tube 13 of flexible stainless steel also improves its corrosion resistance and reduces scale buildup, allowing for more stable and efficient airflow delivery.

[0066] In some embodiments of this utility model, such as Figure 3 As shown, there can be multiple connecting pipes 12, and at least one of the multiple connecting pipes 12 is formed as an air outlet pipe 122. The air outlet pipe 122 is vertical (e.g., Figure 3 Extending in the vertical direction shown, the gas-liquid separator 10 also includes a U-shaped tube 14, which is located in the receiving cavity 113 with its opening facing upward. One end of the U-shaped tube 14 is connected to the gas outlet pipe 122, and the other end of the U-shaped tube 14 extends to the upper part of the receiving cavity 113 and communicates with the receiving cavity 113.

[0067] In this embodiment, multiple connecting pipes 12 are provided, at least one of which is formed as an outlet pipe 122, which can meet the gas outlet requirements of the gas-liquid separator 10. The outlet pipe 122 extends vertically, which is convenient to arrange and allows the airflow to flow out of the receiving cavity 113 more efficiently. In this embodiment, the gas-liquid separator 10 is provided with a U-shaped pipe 14 in the receiving cavity 113. The U-shaped opening of the U-shaped pipe 14 faces upward. One end of the U-shaped pipe 14 is connected to the outlet pipe 122 and the other end extends to the upper part of the receiving cavity 113. The other end of the U-shaped pipe 14 is connected to the receiving cavity 113.

[0068] When the gas-liquid separator 10 is in operation, the gas in the gas flow from the guide pipe 13 is separated from the liquid refrigerant and oil by gravity and can flow into the U-shaped pipe 14 from the other end of the U-shaped pipe 14. The gas flows along the U-shaped pipe 14 to the outlet pipe 122 and then flows out from the receiving cavity 113.

[0069] As the gas flows through the U-shaped tube, it first descends and then rises, which can further separate the remaining liquid refrigerant and oil in the gas, so that pure gas can flow out of the outlet pipe 122, enabling the gas-liquid separator 10 to achieve a good separation effect, thus allowing the gas-liquid separator 10 to well meet the usage requirements.

[0070] In this embodiment, the other end of the U-shaped tube 14 is extended to the upper part of the receiving cavity 113, which facilitates the efficient flow of gas into the U-shaped tube 14 and avoids the situation where liquid refrigerant and oil accumulate and flow into the U-shaped tube 14 when the other end of the U-shaped tube 14 is lower, so that the U-shaped tube 14 can stably play the role of guiding flow during operation.

[0071] In one embodiment of this utility model, such as Figure 3 and Figure 4 As shown, the U-shaped tube 14 may be provided with an oil return hole 141, which is connected to the receiving cavity 113.

[0072] In this embodiment, an oil return hole 141 is provided on the U-shaped tube 14 and the oil return hole 141 is connected to the receiving cavity 113, which can play a role in recovering the accumulated oil and enable the compressor in the HVAC system 100 to obtain a stable and good lubrication effect.

[0073] In one embodiment of this utility model, the U-shaped tube 14 can be a stainless steel tube made of flexible stainless steel.

[0074] In this embodiment, the U-shaped tube 14 is made of flexible stainless steel, which has a simple structure and is easy to process and form. The U-shaped tube 14 has good structural strength and toughness, and can effectively withstand the high-frequency vibrations caused by the airflow impact in the U-shaped tube 14 and the liquid impact in the receiving cavity 113, thereby enabling the gas-liquid separator 10 to operate more stably. The U-shaped tube 14 is made of flexible stainless steel, which makes the guide tube 13 more corrosion resistant and less prone to scale buildup, allowing the U-shaped tube 14 to deliver airflow more stably and effectively.

[0075] In some embodiments of this utility model, such as Figure 1 and Figure 4 As shown, a base may also be provided on the tank 11, and the base is connected to the outer wall of the tank 11. This facilitates the placement of the gas-liquid separator 10 and its installation in the HVAC system 100.

[0076] In one embodiment of this utility model, the diameter of the U-shaped tube 14 is d, and the bending radius of the U-shaped tube 14 is r, satisfying 1.2d≤r≤1.5d. This makes the U-shaped tube 14 compact in structure and occupies less space, thereby saving space in the receiving cavity 113 of the gas-liquid separator 10. To a certain extent, this makes the overall structure of the gas-liquid separator 10 more compact and smaller, facilitating its arrangement in the HVAC system 100.

[0077] In some embodiments of this utility model, the yield strength of the flexible stainless steel is 140MPa to 180MPa; and / or, the tensile strength of the flexible stainless steel is reduced to 400MPa to 600MPa; and / or, the elongation of the flexible stainless steel is 50% to 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 100Hv to 120Hv.

[0078] In this embodiment, the yield strength and / or tensile strength and / or elongation and / or yield strength ratio and / or hardness of the flexible stainless steel are limited, so that the stainless steel pipe structure made of flexible stainless steel in this embodiment can have physical structural characteristics such as lower yield strength, lower tensile strength, higher elongation and good hardness. Among them, the yield strength ratio is the ratio of yield strength to tensile strength. In this embodiment, the yield strength ratio is set to less than 0.4, so that the flexible stainless steel can still have good plastic deformation ability after reaching the yield point. Thus, the stainless steel pipe structure made of flexible stainless steel in this embodiment can have good processing performance and structural performance, so that the connecting pipe 12, guide pipe 13 and U-shaped pipe 14 in this embodiment can carry out fluid transportation more stably.

[0079] In one embodiment of this utility model, the flexible stainless steel may be composed of the following components by weight percentage: C: less than 0.02%, Si: 0.5% to 1%, Mn: 1 to 2%, Cr: 16 to 18%, Ni: 9 to 11%, Cu: 2 to 4%, Mo: 0 to 0.02%, P: less than 0.03%, S: less than 0.03%, with the remainder consisting of Fe and unavoidable impurities.

[0080] In this embodiment, the various components in the flexible stainless steel are defined to enable the flexible stainless steel to form excellent material properties. Specifically, chromium and nickel are added to the flexible stainless steel in this embodiment. The addition of chromium and nickel can make the flexible stainless steel have a lower electro-corrosion potential, a lower electro-corrosion weight loss, and a lower martensitic transformation temperature, thereby giving the flexible stainless steel excellent electro-corrosion resistance and stress resistance, allowing it to be directly flame welded without annealing. The lower martensitic transformation temperature makes it difficult for martensite to form in the flexible stainless steel during the production process, thereby giving the flexible stainless steel excellent resistance to failure cracking, enabling the flexible stainless steel structure such as the connecting pipe 12 in this embodiment to operate more stably and reliably.

[0081] The lower carbon content makes it more difficult for the material to pass through the sensitization zone during hot working and welding, effectively controlling the formation of M23C6 and thus achieving stronger resistance to intergranular corrosion, effectively reducing welding defects. In this embodiment, the specific proportions of each component can be reasonably set according to actual needs.

[0082] In some embodiments of this utility model, the Md30 of the flexible stainless steel can be -50℃ to -80℃.

[0083] Md30 refers to the temperature at which 50% martensite is formed during the production of flexible stainless steel with a deformation of 30%. 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, a lower Md30 value indicates that the material is less likely to form martensite under the same deformation conditions, thus exhibiting stronger resistance to aging cracking and being less prone to cracking. Conversely, a higher Md30 value makes the material more susceptible to martensite formation during processing, potentially leading to cracking. Therefore, by ensuring that the critical temperature for the martensitic transformation of flexible stainless steel meets the above conditions, the connecting pipe 12, the guide pipe 13, and the U-shaped pipe 14 can operate more stably in low-temperature environments. For example, the Md30 of flexible stainless steel can be -50℃, -48℃, -40℃, -10℃, 0℃, 30℃, 35℃, 40℃, 50℃, 80℃, etc.

[0084] In some embodiments of this utility model, the flexible stainless steel can be austenitic stainless steel, and the average grain size of the flexible stainless steel is 20μm to 40μm.

[0085] In this embodiment, the flexible stainless steel is set as austenitic stainless steel with a grain size of 20μm to 40μm. This not only maintains the good corrosion resistance and processability inherent in austenitic stainless steel, but also obtains better mechanical properties and potentially longer service life due to grain refinement.

[0086] In some embodiments of this invention, the wall thickness of the stainless steel pipe can be 1.2mm to 1.5mm. This prevents the wall thickness from being too small, which helps ensure the mechanical strength and compressive strength of the stainless steel pipe, while also ensuring its ductility, allowing it to adapt to complex shape changes and bending requirements. Simultaneously, it prevents the wall thickness from being too large, thereby reducing the cost of the stainless steel pipe and consequently lowering the overall production cost of the gas-liquid separator. For example, the wall thickness of the stainless steel pipe can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.

[0087] The following is for reference. Figures 1-11 Description of a heating, ventilation and air conditioning device 100 according to a second aspect embodiment of the present invention.

[0088] like Figures 1-11 As shown, the HVAC device 100 according to an embodiment of the present invention includes: a pipe connector 20 and a gas-liquid separator 10 according to a first aspect embodiment of the present invention, wherein the pipe connector 20 is plugged into and connected to a connecting pipe 12.

[0089] In this embodiment, the pipe connector 20 and the connecting pipe 12 are connected by insertion, resulting in a simple structure and convenient assembly. For example, the pipe connector 20 and the connecting pipe 12 can be connected by flaring or reducing the opening. Specifically, when the pipe connector 20 is flared, the connecting pipe 12 remains unchanged or is correspondingly reduced; when the pipe connector 20 remains unchanged, the connecting pipe 12 is either flared or reduced; when the pipe connector 20 is reduced, the connecting pipe 12 remains unchanged or is correspondingly flared. The specific insertion method of the pipe connector 20 and the connecting pipe 12 can be reasonably set according to actual assembly needs, and will not be described in detail here.

[0090] According to the HVAC device 100 of the present utility model embodiment, by setting the gas-liquid separator 10 of the first aspect embodiment above, and by setting the portion of the connecting pipe 12 that extends at least out of the receiving cavity 113 as a stainless steel pipe made of flexible stainless steel, the use of copper pipe in the gas-liquid separator 10 can be avoided. The connecting pipe 12 can be directly welded to the pipe joint 20 of the external pipeline using silver-free solder, thereby greatly reducing the processing cost and welding cost of the gas-liquid separator 10, and making it easy to connect the gas-liquid separator 10 to the external pipeline.

[0091] In some embodiments of this utility model, the outer peripheral surface of the pipe joint 20 is provided with a limiting protrusion, which abuts against the end face of the connecting pipe 12; or, the inner peripheral surface of the connecting pipe 12 is provided with a limiting protrusion, which abuts against the end face of the pipe joint 20.

[0092] In this embodiment, a limiting protrusion is provided on the outer peripheral surface of the pipe joint 20. The limiting protrusion abuts against the end face of the connecting pipe 12. When the connecting pipe 12 is connected to the pipe joint 20, the pipe joint 20 is inserted into the connecting pipe 12. The limiting protrusion can play a good role in limiting and fixing, making it easier to position the pipe joint 20 and the connecting pipe 12 during assembly.

[0093] In this embodiment, a limiting protrusion is provided on the inner circumferential surface of the connecting pipe 12. The pipe joint 20 is still inserted into the connecting pipe 12. The limiting protrusion abuts against the end face of the pipe joint 20. This can reduce the outward protrusion structure of the pipe joint 20 and the connecting pipe 12, making the overall structure of the pipe joint 20 and the connecting pipe 12 more stable.

[0094] In one embodiment of this utility model, reference is made to Figure 5 and Figure 6 As shown, both the pipe joint 20 and the connecting pipe 12 can be made of flexible stainless steel, and the pipe joint 20 and the connecting pipe 12 are welded together. Specifically, the pipe joint 20 and the connecting pipe 12 can be welded using a first solder 51, which 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℃.

[0095] In one embodiment of this utility model, reference is made to Figure 7 and Figure 8 As shown, the pipe fitting 20 can be a copper pipe or a copper alloy pipe, and the connecting pipe 12 is a stainless steel pipe. The pipe fitting and the connecting pipe are welded together. Specifically, the pipe fitting 20 and the connecting pipe 12 can be welded using a second solder 52. The second solder 52 contains, by weight, 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, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate. The melting temperature t1 when using the second solder 52 satisfies: 880℃≤t1≤890℃. The brazing temperature t2 when using the second solder 52 satisfies: 920℃≤t2≤930℃.

[0096] In one embodiment of this utility model, reference is made to Figure 9 and Figure 10As shown, the pipe joint 20 has a first sleeve 30 welded to its opening, and the connecting pipe 12 has a second sleeve 40 welded to its opening. The first sleeve 30 and the second sleeve 40 are welded together by a third solder 53 or a fourth solder 54. The first sleeve 30 is a copper sleeve or a copper alloy sleeve; the second sleeve 40 is a copper sleeve or a copper alloy sleeve; the third solder 53 is a tin bronze solder; and the fourth solder 54 is a silver copper solder.

[0097] In some embodiments of this utility model, such as Figure 11 As shown, the HVAC system 100 may also include a four-way valve 70 and a compressor 60, and the two connecting pipes 12 of the gas-liquid separator 10 are respectively connected to the four-way valve 70 and the compressor 60 through the pipe joints 20 of the external pipeline.

[0098] In this embodiment, a four-way valve 70 and a compressor 60 are provided, and the two connecting pipes 12 of the gas-liquid separator 10 are respectively connected to the four-way valve 70 and the compressor 60. The structure is simple and can well meet the operating needs of the HVAC system 100.

[0099] The following will refer to Figures 1-11 The present invention describes a heating, ventilation and air conditioning device 100 according to three specific embodiments.

[0100] Example 1,

[0101] like Figures 1-6 as well as Figure 11 As shown, the HVAC system 100 includes a pipe joint 20, a gas-liquid separator 10, a four-way valve 70, and a compressor 60. The gas-liquid separator 10 is connected to the four-way valve 70 and the compressor 60 through an external pipe. The external pipe forms the pipe joint 20, which is connected to two connecting pipes 12 of the gas-liquid separator 10.

[0102] The gas-liquid separator 10 includes a tank 11, a connecting pipe 12, a guide pipe 13, and a U-shaped pipe 14. The connecting pipe 12 has two sections, an inlet pipe 121 and an outlet pipe 122. The tank 11 has a receiving cavity 113 with two perforations 111 at its upper end. A connecting flange 112 is formed along the circumferential edge of each of the two perforations 111. The inlet pipe 121 and the outlet pipe 122 pass through the two perforations 111 and extend into the receiving cavity 113. Both the inlet pipe 121 and the outlet pipe 122 are sealed to the tank 11 at the perforations 111. The guide pipe 13 is disposed within the receiving cavity 113. One end of the guide pipe 13 is connected to the inlet pipe 121, and the other end extends along an arc. The other end of the guide pipe 13 communicates with the upper part of the receiving cavity 113. The U-shaped tube 14 has its opening facing upwards and one end is connected to the upper part of the receiving cavity 113. The other end of the U-shaped tube 14 is connected to the air outlet 122. The U-shaped tube 14 has an oil return hole 141 at the bottom and middle positions, and the oil return hole 141 is connected to the receiving cavity 113.

[0103] The connecting pipe 12, the guide pipe 13, and the U-shaped pipe 14 of the gas-liquid separator 10 are all stainless steel pipes made of flexible stainless steel. The flexible stainless steel is austenitic stainless steel and can be composed of the following components by weight percentage: C: less than 0.02%, Si: 0.5% to 1%, Mn: 1 to 2%, Cr: 16 to 18%, Ni: 9 to 11%, Cu: 2 to 4%, Mo: 0 to 0.02%, P: less than 0.03%, S: less than 0.03%, with the remainder consisting of Fe and unavoidable impurities.

[0104] The yield strength of flexible stainless steel is 140MPa~180MPa; the tensile strength is reduced to 400MPa~600MPa; the elongation is 50%~80%; the yield strength ratio is less than 0.4; and the hardness is 100Hv~120Hv.

[0105] In this embodiment, the pipe joint 20 is a stainless steel pipe. When the connecting pipe 12 of the gas-liquid separator 10 is connected to the pipe joint 20, the first solder 51 is used for welding. The connecting pipe 12 and the pipe joint 20 can be brazed using flame welding or high-frequency welding. The first solder 51 contains, by weight, 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, 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℃.

[0106] In this embodiment, by setting the gas-liquid separator 10 of the first aspect embodiment above, and by setting at least the portion of the connecting pipe 12 extending out of the receiving cavity 113 as a stainless steel pipe made of flexible stainless steel, the use of copper pipes in the gas-liquid separator 10 can be avoided. The connecting pipe 12 can be directly welded to the pipe joint 20 of the external pipeline using silver-free solder, thereby greatly reducing the processing cost and welding cost of the gas-liquid separator 10, and making it easy to connect the gas-liquid separator 10 to the external pipeline.

[0107] Example 2,

[0108] refer to Figure 7 and Figure 8As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same reference numerals used for the same components. The only difference is that the pipe joint 20 in Embodiment 1 is a stainless steel pipe, while the pipe joint 20 in this embodiment is a copper pipe or a copper alloy pipe. When the connecting pipe 12 of the gas-liquid separator 10 is connected to the pipe joint 20, the second solder 52 is used for welding. The second solder 52 contains, by weight, 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, 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate. The melting temperature t1 when using the second solder 52 satisfies: 880℃≤t1≤890℃. The brazing temperature t2 when using the second solder 52 satisfies: 920℃≤t2≤930℃.

[0109] Example 3,

[0110] refer to Figure 9 and Figure 10 As shown, the results of this embodiment are largely the same as those of Embodiment 1, with the same reference numerals used for the same components. The only difference is that in Embodiment 1, the connecting pipe 12 of the gas-liquid separator 10 is directly brazed to the external pipe joint 20, while in this embodiment, a second sleeve 40 is welded to the opening of the connecting pipe 12, and a first sleeve 30 is welded to the opening of the pipe joint 20. The connecting pipe 12 and the pipe joint 20 are connected and assembled through the second sleeve 40 and the first sleeve 30. The first sleeve 30 and the second sleeve 40 are both copper sleeves or copper alloy sleeves. The first sleeve 30 and the second sleeve 40 are welded together using a third solder 53 or a fourth solder 54. The third solder 53 is tin bronze solder, and the fourth solder 54 is silver copper solder.

[0111] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0112] 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 technical features indicated. 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.

[0113] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication 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.

[0114] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0115] 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 gas-liquid separator (10), characterized in that, include: The tank (11) has a receiving cavity (113); A connecting pipe (12) is connected to the receiving cavity (113) and one end extends out of the receiving cavity (113). At least the portion of the connecting pipe (12) extending out of the receiving cavity (113) is a stainless steel pipe made of flexible stainless steel. The number of the connecting pipes (12) is multiple, and at least one of the multiple connecting pipes (12) is formed as an air inlet pipe (121). The gas-liquid separator (10) also includes a guide pipe (13). The guide pipe (13) is disposed in the receiving cavity (113). One end of the guide pipe (13) is connected to the air inlet pipe (121), and the other end of the guide pipe (13) is connected to the receiving cavity (113) and extends along an arc. The yield strength of the flexible stainless steel is 140MPa~180MPa; and / or, the tensile strength of the flexible stainless steel is reduced to 400MPa~600MPa; 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 100Hv~120Hv.

2. The gas-liquid separator (10) according to claim 1, characterized in that, The connecting pipe (12) is a stainless steel pipe made of the flexible stainless steel.

3. The gas-liquid separator (10) according to claim 1, characterized in that, The tank body (11) is provided with a perforation (111). A connecting flange (112) is formed around the end of the perforation (111) that is away from the receiving cavity (113). The connecting pipe (12) passes through the perforation (111) into the receiving cavity (113). The outer peripheral surface of the connecting pipe (12) is sealed to the inner wall surface of the perforation (111) and the inner peripheral surface of the connecting flange (112).

4. The gas-liquid separator (10) according to claim 1, characterized in that, The guide tube (13) is a stainless steel tube made of the flexible stainless steel.

5. The gas-liquid separator (10) according to claim 1, characterized in that, The number of connecting pipes (12) is multiple, and at least one of the multiple connecting pipes (12) is formed as an air outlet pipe (122). The air outlet pipe (122) extends vertically. The gas-liquid separator (10) also includes a U-shaped pipe (14). The U-shaped pipe (14) is disposed in the receiving cavity (113) with its opening facing upward. One end of the U-shaped pipe (14) is connected to the air outlet pipe (122), and the other end of the U-shaped pipe (14) extends to the upper part of the receiving cavity (113) and communicates with the receiving cavity (113).

6. The gas-liquid separator (10) according to claim 5, characterized in that, The U-shaped tube (14) is provided with an oil return hole (141), which is connected to the receiving cavity (113).

7. The gas-liquid separator (10) according to claim 5, characterized in that, The U-shaped tube (14) is a stainless steel tube made of the flexible stainless steel.

8. The gas-liquid separator (10) according to claim 5, characterized in that, The diameter of the U-shaped tube (14) is d, and the bending radius of the U-shaped tube (14) is r, satisfying 1.2d≤r≤1.5d.

9. The gas-liquid separator (10) according to any one of claims 1-8, characterized in that, The Md30 of the flexible stainless steel is -50℃ to -80℃.

10. The gas-liquid separator (10) according to any one of claims 1-8, characterized in that, The flexible stainless steel is austenitic stainless steel, and the average grain size of the flexible stainless steel is 20μm~40μm.

11. The gas-liquid separator (10) according to any one of claims 1-8, characterized in that, The wall thickness of the stainless steel pipe is 1.2mm to 1.5mm.

12. A heating, ventilation, and air conditioning (HVAC) device (100), characterized in that, include: Pipe joint (20) and gas-liquid separator (10) according to any one of claims 1-11, wherein the pipe joint (20) is plugged into the connecting pipe (12).

13. The HVAC system (100) according to claim 12, characterized in that, The outer circumferential surface of the pipe joint (20) is provided with a limiting protrusion, which abuts against the end face of the connecting pipe (12), or the inner circumferential surface of the connecting pipe (12) is provided with a limiting protrusion, which abuts against the end face of the pipe joint (20).

14. The HVAC system (100) according to claim 12, characterized in that, Both the pipe joint (20) and the connecting pipe (12) are made of flexible stainless steel, and the pipe joint (20) and the connecting pipe (12) are welded together.

15. The HVAC system (100) according to claim 12, characterized in that, The pipe joint (20) is a copper pipe or a copper alloy pipe, the connecting pipe (12) is a stainless steel pipe, and the pipe joint (20) is welded to the connecting pipe (12).

16. The HVAC system (100) according to claim 12, characterized in that, The pipe joint (20) has a first sleeve (30) welded to its opening, and the connecting pipe (12) has a second sleeve (40) welded to its opening. The first sleeve (30) and the second sleeve (40) are welded together by a third solder (53) or a fourth solder (54). The first sleeve (30) is a copper sleeve or a copper alloy sleeve; The second sleeve (40) is a copper sleeve or a copper alloy sleeve; The third solder (53) is a tin bronze solder; The fourth solder (54) is a silver-copper solder.

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