Filter assembly and heating and ventilation device having the same

Abstract

This utility model discloses a filter assembly and a heating and ventilation system (HVAC) device having the same. The filter assembly includes a filter and a connecting pipe for connecting to external piping. The connecting pipe is made of flexible stainless steel. According to this utility model, by using a flexible stainless steel connecting pipe, the installation difficulty between the filter and the external piping can be reduced, thereby reducing the assembly time and cost of the HVAC device. Simultaneously, it also reduces the risk of cracking due to vibration at the connection between the filter and the external piping, thus improving the reliability of the HVAC device.

Description

Technical Field

[0001] This utility model relates to the field of HVAC technology, and in particular to a filter assembly and an HVAC device having the same. Background Technology

[0002] In the structural design of air conditioning units, a filter is typically installed on the compressor's return gas line to filter the refrigerant within the line. However, as the refrigerant flows through the return gas line, it impacts the line, and the compressor vibrates during operation. This reduces the reliability of the connection between the filter and the return gas line, ultimately affecting the overall reliability of the HVAC system. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a filter assembly that can reduce the assembly time and cost of HVAC systems and improve the reliability of HVAC systems.

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

[0005] A filter assembly according to a first aspect of the present invention includes: a filter, the filter including a connecting part for connecting to an external piping, the connecting part being a flexible stainless steel component.

[0006] According to the filter assembly of this utility model, by setting the connecting part to be a flexible stainless steel material, the installation difficulty between the filter and the external piping can be reduced, thereby reducing the assembly time and cost of the HVAC system; at the same time, it can also reduce the risk of cracking due to vibration at the connection between the filter and the external piping, thereby improving the reliability of the HVAC system.

[0007] According to some embodiments of the present invention, the filter includes a housing and a filter element, the housing has a receiving cavity, the filter element is fixed in the receiving cavity, and the connecting part is connected to the housing.

[0008] According to some embodiments of this utility model, the shell is made of flexible stainless steel, and a protruding limiting portion is formed on the inner wall of the connecting pipe, wherein the crystal phase of the limiting portion is austenite.

[0009] According to some embodiments of the present invention, the connecting section includes an inlet section and an outlet section, both of which are made of flexible stainless steel.

[0010] According to some embodiments of the present invention, the filter assembly further includes an external piping, one end of which is connected to the connecting pipe.

[0011] According to some embodiments of this utility model, the external piping is a copper pipe, a copper alloy pipe, or a flexible stainless steel pipe.

[0012] 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.

[0013] According to some embodiments of this utility model, the Md30 of the flexible stainless steel is -50℃ to -80℃.

[0014] According to some embodiments of the present invention, the flexible stainless steel is austenitic flexible stainless steel, and the average grain size of the flexible stainless steel is 20μm to 40μm.

[0015] According to some embodiments of this utility model, the wall thickness of the flexible stainless steel pipe is 1.2mm to 1.5mm.

[0016] According to some embodiments of the present invention, the filter assembly further includes: a transfer pipe, the transfer pipe being connected between the connecting pipe and the external piping.

[0017] According to some embodiments of this utility model, the external piping is a copper pipe or a copper alloy pipe, and the adapter pipe is a copper sleeve.

[0018] According to some embodiments of this utility model, the external piping is inserted into the connecting pipe, and the insertion depth of the external piping is 5mm-20mm.

[0019] According to some embodiments of this utility model, the external piping is inserted into the connecting pipe, and the fitting gap between the external piping and the connecting pipe is 0.1mm-0.2mm.

[0020] According to some embodiments of this utility model, the external piping is welded to the connecting pipe.

[0021] The HVAC device according to the second aspect of the present invention includes a filter assembly according to the first aspect of the present invention.

[0022] According to the present invention, the overall performance of the HVAC device is improved by providing the filter assembly described in the first aspect.

[0023] 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

[0024] Figure 1 This is a schematic diagram of a filter assembly according to an embodiment of the present utility model;

[0025] Figure 2 It is along Figure 1 The cross-sectional view of line AA shown;

[0026] Figure 3 This is a schematic diagram of a filter assembly according to another embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of a filter assembly according to another embodiment of the present invention;

[0028] Figure 5 This is a system diagram of a heating, ventilation, and air conditioning (HVAC) device according to an embodiment of the present utility model;

[0029] Figure 6 This is a schematic diagram of the welding of the connecting pipe and the external piping according to an embodiment of the present invention;

[0030] Figure 7 yes Figure 6 A magnified view of point C, indicated by the center circle;

[0031] Figure 8 This is a schematic diagram of the welding of the connecting pipe and the external piping according to another embodiment of the present invention;

[0032] Figure 9 yes Figure 8 A magnified view of point D, indicated by the middle circle.

[0033] Figure label:

[0034] 100. Filter assembly;

[0035] 10. Filter; 11. Connecting part; 111. Inlet; 112. Outlet; 113. Limiting part; 12. Housing; 121. Receiving cavity; 13. Filter element;

[0036] 20. External piping;

[0037] 30. Transfer of control; 31. First transfer of control; 32. Second transfer of control;

[0038] 40, First solder; 50, Second solder; 60, Third solder;

[0039] 200, Compressor; 301, Exhaust pipe; 302, Suction pipe; 400, Gas-liquid separator; 501, Low-pressure side outlet pipe; 502, High-pressure side outlet pipe; 600, Four-way valve; 701, First shut-off valve; 702, Second shut-off valve; 801, First expansion valve; 802, Second expansion valve;

[0040] 2000, Indoor heat exchanger; 3000, Outdoor heat exchanger;

[0041] 1. Heating, ventilation and air conditioning system; 1A. Indoor unit; 1B. Outdoor unit. Detailed Implementation

[0042] 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.

[0043] The following is for reference. Figures 1-4 A filter assembly 100 according to a first aspect embodiment of the present invention is described.

[0044] like Figure 1 As shown, the filter assembly 100 according to an embodiment of the present invention includes: a filter 10, the filter 10 including a connecting part 11 for connecting to an external piping 20, the connecting part 11 being a flexible stainless steel material.

[0045] Understandably, flexible stainless steel not only maintains the structural strength of conventional flexible stainless steel, but also has high ductility that conventional flexible stainless steel does not have. This allows the filter 10 to fit well even when space is limited or when a specific angle is required to connect to the external pipe. As a result, the installation difficulty between the filter 10 and the external pipe 20 can be reduced, thereby reducing the assembly time and cost of the HVAC system.

[0046] It should be noted that in HVAC systems, the filter 10 can be installed on the compressor return pipe or at the return port to filter the refrigerant and prevent the compressor from being damaged by impurities mixed in with the refrigerant. When the refrigerant flows in the return pipe, it impacts the pipe, and the compressor vibrates during HVAC operation. Flexible stainless steel can absorb and disperse external forces; therefore, in this application, the connecting part 11 is made of flexible stainless steel, which also reduces the risk of cracking due to vibration at the connection between the filter 10 and the external piping 20, thereby improving the reliability of the HVAC system.

[0047] The flexible stainless steel pipe involved in this utility model has low yield strength and high elongation, thus possessing processing performance close to that of copper pipes. It can be processed using equipment used for processing copper pipes, such as flanging, bending, flaring, and necking. Unlike traditional flexible stainless steel flanging processes that require punching before flanging, flexible stainless steel pipes can be punched and flanged in a single step, just like copper pipes.

[0048] According to the filter assembly 100 of this utility model embodiment, by setting the connecting pipe 11 to be a flexible stainless steel material, the installation difficulty between the filter 10 and the external piping 20 can be reduced, thereby reducing the assembly time and cost of the HVAC system; at the same time, it can also reduce the risk of cracking due to vibration at the connection between the filter 10 and the external piping 20, thereby improving the reliability of the HVAC system.

[0049] According to some embodiments of this utility model, the flexible stainless steel comprises at least copper. The flexible stainless steel is a copper-containing stainless steel, which gives it good ductility and flexibility. This is because copper forms a fine, dispersed phase in the stainless steel, hindering dislocation movement and thus increasing the yield strength of the material. Furthermore, appropriate amounts of copper can refine the grains and reduce defects at grain boundaries, thereby improving the toughness of the material. In addition, the addition of copper can also induce a martensitic phase transformation, further increasing the strength of the stainless steel.

[0050] Therefore, by using flexible stainless steel containing copper, the stainless steel pipe can adapt to complex shape changes and bending requirements without losing its corrosion resistance and mechanical strength. Even after undergoing complex forming processes, such as processing into corrugated pipes or sleeves of specific shapes, it can still maintain good mechanical strength and compressive strength. Flexible stainless steel is easy to bend, weld and connect, so it is convenient to form the connecting pipe 11, and it is also convenient to directly connect the connecting pipe 11 to the external piping 20.

[0051] In addition, valve connectors or bends in related technologies are often made of copper to reduce the welding difficulty of valve connectors and bends. However, copper is expensive. The connector part 11 of this application is made of flexible stainless steel. Therefore, the filter assembly of this application can reduce production costs.

[0052] In some embodiments of this utility model, 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%.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] According to some embodiments of this utility model, such as Figure 2 As shown, the filter 10 includes a housing 12 and a filter element 13. The housing 12 has a receiving cavity 121, and the filter element 13 is fixed inside the receiving cavity 121. A connecting part 11 is connected to the housing 12. The housing 12 is the main structure of the filter 10, primarily used to fix the filter element 13. The filter element 13 is the core component of the filter 10, mainly responsible for capturing and blocking particulate matter, microorganisms, chemical impurities, etc., from the flowing air or liquid. The connecting part 11, as an extension of the housing 12, is mainly used to connect to an external piping system, ensuring that the filter 10 can be smoothly integrated into the overall circulation process.

[0057] It should be noted that the housing 12 typically needs to possess sufficient strength to protect the filter element 13, while also facilitating installation and maintenance. The housing 12 can be made of various materials, such as flexible stainless steel. The filter element 13 is primarily used to filter impurities; different filter media require different materials. Therefore, the material and structure of the filter element 13 can be selected according to application requirements. The material of the filter element 13 can include various materials, such as glass fiber, flexible stainless steel wire mesh, and polypropylene.

[0058] According to some embodiments of this utility model, the housing 12 is made of flexible stainless steel. Specifically, flexible stainless steel has stable structural strength, corrosion resistance, and ductility. Therefore, making the housing 12 a flexible stainless steel component allows the housing 12 to have good corrosion resistance, strength, and flexibility. This improves the ease of installation of the filter 10. At the same time, when the filter 10 needs maintenance or filter element replacement, it can be more easily disassembled and reassembled, thereby reducing the time and difficulty of maintenance work on the filter 10.

[0059] like Figure 2 As shown, a protruding limiting portion 113 is formed on the inner wall of the connecting part 11, and the crystal phase of the limiting portion 113 is austenitic. The limiting portion 113 serves as a positioning device when the connecting part 11 is connected to the external piping 20, ensuring that the external piping 20 reaches the correct position when it extends into the connecting part 11. Austenite is a typical crystal phase in flexible stainless steel, possessing excellent corrosion resistance, mechanical properties, and high-temperature resistance. Therefore, selecting austenitic crystal phase as the material property of the limiting portion 113 allows it to possess high mechanical properties and high-temperature resistance, effectively preventing deformation of the limiting portion 113 during the connection between the connecting part 11 and the external piping 20, thereby ensuring the reliability of the connection between the external piping 20 and the filter 10.

[0060] According to some embodiments of this utility model, such as Figure 2 As shown, the connecting section 11 includes an inlet section 111 and an outlet section 112, both made of flexible stainless steel. Specifically, the inlet section 111 is mainly used to guide the filter medium into the filter 10, and the outlet section 112 is mainly used to discharge the filtered medium from the filter 10. Therefore, since both the inlet section 111 and the outlet section 112 are made of flexible stainless steel, it can be understood that the air or fluid inlet and outlet channels have good bending and adaptability, allowing both the inlet and outlet ends of the filter 10 to adapt to environments with limited installation space or complex piping layouts. This further reduces the installation difficulty of the filter 10 and reduces the assembly time and cost of the HVAC system.

[0061] Optionally, the diameters of the inlet 111 and the outlet 112 may be the same or different, so that the filter 10 can be adapted to different pipelines, thereby improving the applicability of the filter 10.

[0062] According to some embodiments of this utility model, such as Figures 1-4 As shown, the filter assembly 100 further includes an external piping 20, one end of which is connected to the connecting section 11. The external piping 20, connected to the connecting section 11, is used to supply filter media to the filter 10 or to transport the filtered media to a designated location.

[0063] Optionally, there may be multiple external pipes 20, which can be straight pipes or bends, and their specific shapes and dimensions can be designed according to actual conditions. For example, refer to... Figure 1 There are two external pipes 20, both of which are straight pipes, connected to the inlet 111 and outlet 112 of the connecting section 11, respectively. (Refer to...) Figure 3 The external piping 20 includes two pipes, which are respectively connected to the inlet 111 and outlet 112 of the connecting section 11, and one of the external piping 20 is a straight pipe and the other external piping 20 is a bent pipe.

[0064] Optionally, multiple filters 10 may be used, and these multiple filters 10 are connected via external piping 20. Having multiple filters 10 can increase the filtration effect on the filter media, thereby improving the cleanliness of the filter media. For example... Figure 4 As shown, there are two filters 10, which are arranged in parallel and connected by an external piping 20.

[0065] Optionally, an mounting hole is formed on the external piping 20, and a flange is formed on the peripheral wall of the mounting hole. The mounting hole is used to connect with other pipes, and the flange can increase the contact area between the external piping 20 and other pipes, thereby improving the connection stability between the external piping 20 and other pipes.

[0066] According to some embodiments of this utility model, the external piping 20 is a copper pipe, a copper alloy pipe, or a flexible stainless steel pipe. It is understood that the external piping 20 can be a copper pipe, a copper alloy pipe, or a flexible stainless steel pipe.

[0067] Copper pipes and copper alloy pipes have better heat conduction performance. Therefore, using copper pipes or copper alloy pipes for external piping 20 is beneficial for refrigerant transmission in the air conditioning system.

[0068] Flexible stainless steel pipes have better strength and higher toughness. Therefore, using flexible stainless steel pipes for external piping 20 can give external piping 20 a higher bending limit. As a result, when the layout space changes during the design of HVAC systems, it is easier to arrange the filter assembly 100 in the layout space, thereby reducing the design difficulty of HVAC systems.

[0069] In some embodiments of this utility model, 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.

[0070] According to some embodiments of this utility model, the flexible stainless steel pipe is 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, thereby achieving stronger resistance to pitting corrosion and stress corrosion.

[0071] It should be further explained that the stainless steel pipe 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.

[0072] The stainless steel pipe involved in this utility model has low yield strength and high elongation, thus possessing processing performance close to that of copper pipes. It can be processed using equipment for processing copper pipes, such as flanging, bending, flaring, and necking. Unlike traditional stainless steel flanging processes that require punching before flanging, stainless steel pipes can be punched and flanged in a single step, just like copper pipes.

[0073] According to some embodiments of this utility model, the Md30 of the flexible stainless steel is -50℃ to -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 generated when the deformation is 30%. This parameter is very important for predicting the behavior of flexible stainless steel during processing because the formation of martensite affects the hardness and magnetism of the material. Generally speaking, the lower the "Md30" value, the more difficult it is for the material to form martensite under the same deformation conditions. Therefore, the material has a stronger resistance to aging cracking, i.e., it is less prone to cracking. Conversely, if the "Md30" value is high, the material is more likely to generate 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 filter assembly 100 can operate well in low-temperature environments with good stability.

[0074] According to some embodiments of this utility model, the flexible stainless steel is austenitic flexible stainless steel with an average grain size of 20μm to 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 flexible stainless steel, but also achieves superior mechanical properties and a potentially longer service life due to grain refinement.

[0075] According to some embodiments of this utility model, the wall thickness of the flexible stainless steel tube is 1.2mm to 1.5mm. This ensures that the wall thickness is not too small, which helps to guarantee the mechanical strength and compressive strength of the flexible stainless steel tube. At the same time, it also ensures the ductility of the flexible stainless steel tube, enabling it to adapt to complex shape changes and bending requirements. Furthermore, it also ensures that the wall thickness is not too large, thereby reducing the cost of the flexible stainless steel tube and thus reducing the production cost of the entire filter assembly 100.

[0076] According to some embodiments of this utility model, the filter assembly 100 further includes an adapter pipe 30, which is connected between the connecting pipe 11 and the external piping 20. On one hand, the adapter pipe 30 can be used to accommodate the diameter difference between the connecting pipe 11 and the external piping 20. If the connecting pipe 11 of the filter 10 is not directly compatible with the existing external piping 20 (e.g., different diameters), the adapter pipe 30 can serve as a transitional connection, thereby enabling smooth connection between pipes of different sizes. On the other hand, when the materials of the filter 10 and the external piping 20 are inconsistent, the adapter pipe 30 can be made of a material with good compatibility with these materials, thus ensuring the reliability of the connection between the filter 10 and the external piping 20.

[0077] According to some embodiments of this utility model, the external piping 20 is a copper pipe or a copper alloy pipe, and the adapter pipe 30 is a copper sleeve. It should be noted that, typically, the connecting part 11 is welded to the external piping 20 via the adapter pipe 30. When the connecting part 11 is a flexible stainless steel component and the external piping 20 is a copper pipe or a copper alloy pipe, the adapter pipe 30 connecting the connecting part 11 and the external piping 20 is a copper sleeve. The copper sleeve can be welded to both the flexible stainless steel component and the external piping 20. Therefore, by using a copper sleeve for the adapter pipe 30, the welding of the filter 10 to the external piping 20 can be achieved, and the welding stability of the filter 10 to the external piping 20 can be guaranteed.

[0078] In some examples, the external piping 20 and the connecting pipe 11 can be indirectly welded together by one adapter pipe 30 or by multiple adapter pipes 30.

[0079] For example Figure 6 and Figure 7As shown, the external piping 20 and the connecting pipe section 11 can be welded together by two adapter pipes 30, namely the first adapter pipe 31 and the second adapter pipe 32.

[0080] The external piping 20 has a first adapter pipe 31 welded to its port. The first adapter pipe 31 is a copper sleeve or a copper alloy sleeve. That is to say, the external piping 20 can be indirectly welded to the connecting pipe 11 through the first adapter pipe 31.

[0081] A second connecting pipe 32, which is a copper pipe or a copper alloy pipe, is welded to the pipe opening of the connecting section 11. That is, the second connecting pipe 32 is welded to the pipe opening of the connecting section 11, allowing indirect welding between the external piping 20 and the connecting section 11 via the second connecting pipe 32. Thus, the second connecting pipe 32 can be pre-welded to the pipe opening of the connecting section 11, and the first connecting pipe 31 can be welded to the pipe opening of the external piping 20. The welding of the first connecting pipe 31 and the second connecting pipe 32 then achieves the welded connection between the external piping 20 and the connecting section 11.

[0082] Furthermore, such as Figure 6 and Figure 7 As shown, the connecting part 11 is made of flexible stainless steel, the external piping 20 is made of flexible stainless steel, the first adapter pipe 31 and the second adapter pipe 32 are made of copper pipe or copper alloy. The connecting part 11 and the second adapter pipe 32 are welded together by the second solder 50, and the external piping 20 and the first adapter pipe 31 are welded together by the second solder 50.

[0083] The second solder 50 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 the second solder 50 is used contains, by weight (wt%), 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate; the melting temperature t1 when the second solder 50 is used satisfies: 880℃≤t1≤890℃; the brazing temperature t2 when the second solder 50 is used satisfies: 920℃≤t2≤930℃.

[0084] The first transfer pipe 31 and the second transfer pipe 32 are connected by a third solder 60, which is either tin bronze solder or silver copper solder.

[0085] According to some embodiments of this utility model, such as Figure 2 and Figure 8As shown, the external piping 20 is inserted into the connecting part 11, and the insertion depth H of the external piping 20 is 5mm-20mm. This ensures that the insertion depth of the external piping 20 and the connecting part 11 is not too small, which helps to increase the contact area between the external piping 20 and the connecting part 11, thereby increasing the sealing effect between the external piping 20 and the connecting pipe 30. At the same time, it also ensures that the insertion depth of the external piping 20 and the connecting part 11 is not too large, thereby reducing the use of materials and unnecessary stress concentration, and thus increasing the service life of the filter assembly 100.

[0086] For example, the insertion depth of the external piping 20 can be 5mm, 10mm, 15mm or 20mm.

[0087] According to some embodiments of this utility model, such as Figure 2 As shown, the external piping 20 is plugged into the connecting part 11, and the fitting clearance L between the external piping 20 and the connecting part 11 is 0.1mm-0.2mm. This ensures that the fitting clearance between the external piping 20 and the connecting part 11 is not too small, thus guaranteeing a smooth and efficient assembly process; at the same time, it also ensures that the fitting clearance between the external piping 20 and the connecting part 11 is not too large, which helps to reduce the material required for sealing the external piping 20 and the connecting part 11.

[0088] For example, the fitting clearance between the external piping 20 and the connecting part 11 can be 0.1mm, 0.15mm or 0.2mm.

[0089] According to some embodiments of this utility model, the external piping 20 is welded to the connecting pipe 11. The welded connection has high strength and good sealing performance. Therefore, by using a welded connection between the external piping 20 and the connecting pipe 11, the connection stability and sealing performance of the external piping 20 and the connecting pipe 11 can be improved, thereby ensuring the overall sealing performance of the filter assembly 100.

[0090] Optionally, the solder required for welding the filter 10 to the external piping 20 varies depending on the material of the external piping 20. For example, when the external piping 20 is a copper pipe or a copper alloy pipe, a second solder 50 is used for welding the filter 10 to the external piping 20. The composition and mass percentage of the second solder are: Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder being Zn; the melting temperature range is 880℃-890℃, and the recommended brazing temperature is 920℃-930℃. The composition and percentage of the flux are: boric acid: 60%-80%, fluoride: 5%-15%, and potassium borate: 10%-20%.

[0091] For example, when the external piping 20 is a flexible stainless steel pipe, the filter 10 is welded to the external piping 20 using a first solder 40. The composition and mass percentage of the first solder 40 are: Cu: 46%-50%, Ni: 9%-11%, Si: 0.04%-0.25%, with the remainder being Zn and unavoidable impurities; the melting temperature range is 910℃-935℃, and the recommended brazing temperature is 950℃-975℃. The composition and mass percentage of the flux are: boric acid: 60%-80%, fluoride: 5%-15%, potassium borate: 10%-20%.

[0092] like Figure 8 and Figure 9 As shown, the external piping 20 is made of flexible stainless steel, and the connecting part 11 is inserted into the external piping 20 and directly welded together by the first solder 40.

[0093] The HVAC device 1 according to a second aspect of the present invention includes a filter assembly 100 according to a first aspect of the present invention.

[0094] Specifically, refer to Figure 5 The HVAC system 1 includes an indoor unit 1A and an outdoor unit 1B. Indoor unit 1A includes an indoor heat exchanger 2000 and a second expansion valve 802. Outdoor unit 1B includes an outdoor heat exchanger 3000, a compressor 200, an exhaust pipe 301, an intake pipe 302, a gas-liquid separator 400, a low-pressure side outlet pipe 501, a high-pressure side outlet pipe 502, a four-way valve 600, a first shut-off valve 701, a second shut-off valve 702, and a first expansion valve 801. The first shut-off valve 701 is located on the low-pressure side outlet pipe 501, and the second shut-off valve 702 is located on the high-pressure side outlet pipe 502. The first expansion valve 801 is located on the high-pressure side outlet pipe 502 and is positioned between the indoor heat exchanger 2000 and the second shut-off valve 702. The second expansion valve 802 is positioned between the second shut-off valve 702 and the outdoor heat exchanger 3000.

[0095] There are two filter assemblies 100, one of which is connected in series on the low-pressure side outlet pipe 601 and arranged between the four-way valve 600 and the first shut-off valve 701; the other is connected in series on the high-pressure side outlet pipe 602 and arranged between the indoor heat exchanger 2000 and the first expansion valve 801.

[0096] According to the present invention, the overall performance of the HVAC device 1 is improved by providing the filter assembly 100 of the first aspect embodiment described above.

[0097] The following will refer to Figures 1-4 The present invention describes a filter assembly 100 according to four specific embodiments.

[0098] Example 1,

[0099] Reference Figure 2 The filter assembly 100 includes a filter 10 and an external piping 20.

[0100] Specifically, the filter 10 includes a connector 11 for connecting an external piping 20, one end of which is connected to the connector 11.

[0101] The connecting section 11 includes an inlet section 111 and an outlet section 112. Both the connecting section 11 and the external piping 20 are made of flexible stainless steel. There are two external piping 20s, both of which are straight pipes, connected to the inlet section 111 and the outlet section 112 of the connecting section 11, respectively. The external piping 20 is inserted into the connecting section 11, with a fitting clearance of 0.1mm-0.2mm; the insertion depth of the external piping 20 is 5mm-20mm.

[0102] The filter 10 also includes a housing 12 and a filter element 13. The housing 12 has a receiving cavity 121, and the filter element 13 is fixed in the receiving cavity 121. The connecting part 11 is connected to the housing 12. The housing 12 is made of flexible stainless steel, and a protruding limiting part 113 is formed on the inner wall of the connecting part 11. The crystal phase of the limiting part 113 is austenitic.

[0103] Furthermore, the flexible stainless steel is austenitic flexible stainless steel, and the average grain size of the flexible stainless steel is 20μm to 40μm.

[0104] Flexible stainless steel is 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. The Md30 grade of flexible stainless steel has a temperature range of -50℃ to -80℃.

[0105] The yield strength of flexible stainless steel is 140-180 MPa; the tensile strength is 400-600 MPa; the elongation is 50-80%; the yield strength ratio is less than 0.4; and the hardness is 100-120 Hv.

[0106] The wall thickness of flexible stainless steel pipes is 1.2mm to 1.5mm.

[0107] In addition, the external piping 20 and the connecting pipe 11 are welded together using a first solder, wherein,

[0108] The first solder contains, by weight, Cu: 46%–50%, Ni: 9%–11%, Si: 0.04%–0.25%, with the remainder consisting of Zn and unavoidable impurities;

[0109] The flux used when applying the first solder consists of 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate, calculated by weight.

[0110] The melting temperature t1 when using the first solder satisfies: 910℃≤t1≤935℃;

[0111] The brazing temperature t2 when using the first solder satisfies: 950℃≤t2≤975℃;

[0112] According to the filter assembly 100 of this utility model embodiment, by setting the connecting pipe 11 to be a flexible stainless steel material, the installation difficulty between the filter 10 and the external piping 20 can be reduced, thereby reducing the assembly time and cost of the HVAC system; at the same time, it can also reduce the risk of cracking due to vibration at the connection between the filter 10 and the external piping 20, thereby improving the reliability of the HVAC system.

[0113] Example 2,

[0114] Reference Figure 3 The structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that the two external pipes 20 described in Embodiment 1 are both straight pipes, while one of the two external pipes 20 in this Embodiment 2 is a straight pipe and the other is a bent pipe.

[0115] Example 3,

[0116] Reference Figure 4 The structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that in Embodiment 1, there is one filter 10 and two external pipes 20, and both external pipes 20 are straight pipes, while in this Embodiment 3, there are two filters 10 and three external pipes 20.

[0117] Specifically, the filter 10 includes a first filter 10 and a second filter 10, and the external piping 20 includes a first piping, a second piping and a third piping. The first piping is formed as a U-shaped pipe connected between the first filter 10 and the second filter 10. The second piping is formed as a straight pipe connected to the end of the first filter 10 away from the first piping. The third piping is formed as a bent pipe connected to the end of the second filter 10 away from the first piping.

[0118] Example 4,

[0119] This embodiment has a structure that is largely the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that the external piping 20 in Embodiment 1 is a flexible stainless steel pipe, while the external piping 20 in this embodiment 4 is a copper pipe or a copper alloy pipe.

[0120] Specifically, the external piping 20 and the connecting pipe 11 are welded together using a second solder, wherein...

[0121] The second solder 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;

[0122] The flux used when using the second solder consists of 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate, calculated by weight.

[0123] When using the second solder, the melting temperature t1 must satisfy: 880℃≤t1≤890℃;

[0124] When using the second solder, the brazing temperature t2 must satisfy: 920℃≤t2≤930℃.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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 filter assembly (100), characterized in that, include: The filter (10) includes a connector (11) for connecting to an external piping (20), the connector (11) being made of flexible stainless steel.

2. The filter assembly (100) according to claim 1, characterized in that, The filter (10) includes a housing (12) and a filter element (13). The housing (12) has a receiving cavity (121). The filter element (13) is fixed in the receiving cavity (121). The connecting part (11) is connected to the housing (12).

3. The filter assembly (100) according to claim 2, characterized in that, The housing (12) is made of flexible stainless steel, and a protruding limiting part (113) is formed on the inner wall of the connecting part (11), the crystal phase of the limiting part (113) being austenitic.

4. The filter assembly (100) according to claim 3, characterized in that, The receiving part (11) includes an inlet (111) and an outlet (112), both of which are made of flexible stainless steel.

5. The filter assembly (100) according to claim 1, characterized in that, Also includes: An external piping (20) is provided, one end of which is connected to the connecting pipe (11).

6. The filter assembly (100) according to claim 5, characterized in that, The external piping (20) is a copper pipe, a copper alloy pipe, or a flexible stainless steel pipe.

7. The filter assembly (100) according to any one of claims 1-6, 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 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.

8. The filter assembly (100) according to any one of claims 1-6, characterized in that, The Md30 of the flexible stainless steel is -50℃ to -80℃.

9. The filter assembly (100) according to any one of claims 1-6, characterized in that, The flexible stainless steel is austenitic flexible stainless steel, and the average grain size of the flexible stainless steel is 20μm to 40μm.

10. The filter assembly (100) according to any one of claims 1-6, characterized in that, The wall thickness of flexible stainless steel pipes is 1.2mm to 1.5mm.

11. The filter assembly (100) according to claim 5, characterized in that, Also includes: A transfer pipe is connected between the connecting section (11) and the external piping (20).

12. The filter assembly (100) according to claim 11, characterized in that, The external piping (20) is a copper pipe or a copper alloy pipe, and the adapter pipe is a copper sleeve.

13. The filter assembly (100) according to claim 5, characterized in that, The external piping (20) is inserted into the connecting pipe (11), and the insertion depth of the external piping (20) is 5mm-20mm.

14. The filter assembly (100) according to claim 5, characterized in that, The external piping (20) is plugged into the connecting part (11), and the fitting gap between the external piping (20) and the connecting part (11) is 0.1mm-0.2mm.

15. The filter assembly (100) according to claim 5, characterized in that, The external piping (20) is welded to the connecting pipe (11).

16. A heating, ventilation, and air conditioning (HVAC) device, characterized in that, Includes the filter assembly (100) according to any one of claims 1-15.

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