Volute casing, centrifugal fan, heating, ventilation and air-conditioning indoor unit and heating, ventilation and air-conditioning system

Abstract

A volute casing (100), a centrifugal fan (1000), a heating, ventilation and air-conditioning indoor unit (2100), and a heating, ventilation and air-conditioning system (2000). The volute casing (100) comprises an enclosing plate (20) and two oppositely arranged side plates (10). The enclosing plate (20) extends circumferentially to form a volute casing profile (3001). The two oppositely arranged side plates (10) are respectively connected to two sides of the enclosing plate (20); at least one side plate (10) is provided with an air inlet (11); at least one side plate (10) is detachably connected to the enclosing plate (20); and at least one side plate (10) is made of a first material, and the enclosing plate (20) is made of a second material, with the density of the first material being less than the density of the second material.

Description

volutes, centrifugal fans, indoor HVAC units and HVAC systems

[0001] Priority information

[0002] This application claims priority to patent application No. 202411848644.6, filed with the China National Intellectual Property Administration on December 15, 2024, the entire contents of which are incorporated herein by reference as if copied herein. Technical Field

[0003] This invention relates to the field of air conditioning technology, and more particularly to a volute casing, a centrifugal fan, an indoor unit for heating and ventilation, and a heating and ventilation system. Background Technology

[0004] Centrifugal fans in HVAC indoor units typically consist of components such as a volute, impeller, and motor. The volute's function is to guide airflow and improve fan efficiency. In related technologies, the volute is relatively heavy, which leads to higher transportation and installation costs. Summary of the Invention

[0005] The present invention provides a volute, a centrifugal fan, an indoor HVAC unit, and an HVAC system to solve at least one of the aforementioned technical problems.

[0006] The volute of this invention includes a surrounding plate and two opposing side plates. The surrounding plate extends circumferentially to form a volute profile, and the two opposing side plates are respectively connected to both sides of the surrounding plate. At least one of the side plates is provided with an air inlet. The at least one side plate is detachably connected to the surrounding plate. The at least one side plate is made of a first material, and the surrounding plate is made of a second material. The density of the first material is less than the density of the second material.

[0007] In the volute of this invention, when both the side plates and the surrounding plates are made of high-density materials, the volute is heavy, resulting in higher transportation and installation costs. Conversely, when both side plates and the surrounding plates are made of low-density materials, the volute is lighter, but manufacturing costs are higher because low-density materials are typically more complex to manufacture. Therefore, by using at least one side plate made of a low-density first material within the same volume, the volute can achieve both lightweight and low cost; that is, lower transportation, installation, and manufacturing costs while maintaining a lighter weight. Furthermore, since the surrounding plates are made of a high-density second material, the overall structural strength of the volute still meets requirements. By providing air inlets on the side plates, airflow into the volute can be more effectively controlled and guided, thereby increasing airflow inside the volute and improving heat dissipation efficiency.

[0008] Furthermore, the detachable design allows the side plates and surround plates of the volute to be manufactured separately and then assembled. This modular production method improves production efficiency and reduces complexity and cost in the production process. At the same time, the detachable design facilitates later maintenance and replacement, improving assembly efficiency. For example, the detachable design of the side plates and surround plates makes it easy to install and remove the impeller.

[0009] In some embodiments, the first material is plastic and the second material is metal.

[0010] In some embodiments, each of the side plates has a base plate configured as the outer side of the volute, and the side plate made of the first material has a connecting portion that extends from the base plate toward the other side plate and is detachably attached to the edge of the enclosure.

[0011] In some embodiments, the connecting portion extends circumferentially along the volute profile, and the connecting portion has a plurality of fastening portions spaced apart along the circumferential extension trajectory, wherein the plurality of fastening portions are detachably connected to the edge portion of the enclosure.

[0012] In some embodiments, the side panel made of the first material has a retaining edge opposite to the connecting portion, a gap is formed between the retaining edge and the connecting portion, and the edge portion of the enclosure is inserted into the gap.

[0013] In some embodiments, the retaining edge is provided with a support protrusion, the support protrusion is located in the gap, and the support protrusion abuts against the edge of the enclosure.

[0014] In some embodiments, the fastening part is configured as a boss that protrudes from the side of the connecting part away from the surrounding plate, and a mounting hole is provided through the top surface of the boss away from the surrounding plate. The mounting hole is opposite to the adapter hole on the edge side of the surrounding plate for fasteners to pass through and fix.

[0015] In some embodiments, the boss is configured as a planar surface away from the top surface of the enclosure, and the top surface abuts against the head surface of the fastener.

[0016] In some embodiments, the volute profile is configured as an air outlet area, an air intake area, and a volute tongue located between the air outlet area and the air intake area. The air outlet area includes a near volute tongue wall and a far volute tongue wall disposed opposite to each other. The near volute tongue wall is connected to the air intake area via the volute tongue. Airflow flows through the air inlet, through the air intake area, to the air outlet area, and out of the volute from the air outlet area.

[0017] The connecting portion includes a first connecting portion, a second connecting portion, and a third connecting portion. The first connecting portion extends along the profile of the distal volute tongue wall and is detachably overlapped and fixed to the distal volute tongue wall. The second connecting portion extends along the profile of the proximal volute tongue wall and is detachably overlapped and fixed to the proximal volute tongue wall. The third connecting portion extends along the profile of the suction zone and is detachably overlapped and fixed to the plate wall of the suction zone.

[0018] In some embodiments, the side panel made of the first material has a retaining edge that extends from the substrate toward the other side panel. The retaining edge is located within the suction area and is disposed opposite to the third connecting portion to form a gap, and the edge portion of the enclosure is inserted into the gap.

[0019] In some embodiments, the surfaces of the first connecting portion and the second connecting portion facing the enclosure are defined as inner surfaces. The inner surface of the first connecting portion is provided with a first overlapping groove, and the distal volute tongue wall overlaps in the first overlapping groove. The inner surface of the second connecting portion is provided with a second overlapping groove, and the proximal volute tongue wall overlaps in the second overlapping groove.

[0020] In some embodiments, the inner surface of the first connecting portion is flush with the proximal cochlear tongue wall, and the inner surface of the second connecting portion is flush with the distal cochlear tongue wall.

[0021] In some embodiments, each of the substrates includes a first substrate and a second substrate, with two first substrates covering both sides of the suction zone and two second substrates covering both sides of the outlet zone. The two first substrates are parallel to each other, and the two second substrates extend obliquely away from each other in a direction from upstream to downstream of the outlet zone.

[0022] The second substrate made of the first material has a first connecting portion and a second connecting portion. The width of the first connecting portion and the second connecting portion gradually increases from the upstream to the downstream direction of the air outlet area. The first overlapping groove, the second overlapping groove, and the third connecting portion are all of equal width.

[0023] In some embodiments, the connecting portion further includes a fourth connecting portion, which connects the second connecting portion and the third connecting portion, extends along the profile of the volute tongue, and supports the volute tongue.

[0024] In some embodiments, each of the side panels has a base plate configured to form the shape of the volute, the at least one of the side panels is made of plastic, the enclosure is made of metal, the space between the two base plates is defined as the inner side, and the side panel made of the first material has a guide ring extending integrally inward from the base plate, the guide ring forming the air inlet.

[0025] In some embodiments, both side panels are integrally molded from plastic, each side panel is detachably connected to the enclosure, each side panel has the air guide ring, the air guide rings of the two side panels extend toward each other, and the two air inlets formed by the two side panels are coaxially arranged.

[0026] In some embodiments, the two side plates are configured to be mirror symmetrical.

[0027] In some embodiments, one of the two side panels is made of plastic, and the other side panel and the enclosure are made of metal, wherein the side panel made of the first material forms the air inlet, and the side panel made of metal is equipped with a drive motor.

[0028] The centrifugal fan of the present invention includes an impeller and a volute as described in any of the above embodiments, wherein the impeller is housed in the volute.

[0029] The indoor unit of the heating and ventilation system includes the centrifugal fan described in the above embodiments.

[0030] In some embodiments, the HVAC indoor unit includes a first machine and a second machine. The first machine includes a first housing and a centrifugal fan disposed within the first housing. The second machine includes a second housing and an indoor heat exchanger disposed within the second housing. The first housing and the second housing are detachably connected.

[0031] The HVAC system of this invention includes the indoor HVAC unit and the outdoor HVAC unit described in the above embodiments, wherein the outdoor HVAC unit and the indoor HVAC unit are connected by pipes.

[0032] Additional aspects and advantages of the 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

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0034] Figure 1 is a schematic diagram of the structure of the indoor unit of the HVAC system according to an embodiment of the present invention;

[0035] Figure 2 is a schematic diagram of the structure of the centrifugal fan according to an embodiment of the present invention;

[0036] Figure 3 is a structural schematic diagram of the enclosure and the third docking portion according to an embodiment of the present invention;

[0037] Figure 4 is a partial structural schematic diagram of the centrifugal fan according to an embodiment of the present invention;

[0038] Figure 5 is a schematic diagram of another part of the structure of the centrifugal fan according to an embodiment of the present invention;

[0039] Figure 6 is an enlarged view of part b of the centrifugal fan in Figure 5;

[0040] Figure 7 is an enlarged view of part d of the centrifugal fan in Figure 4;

[0041] Figure 8 is a cross-sectional view of the centrifugal fan in Figure 5 along the AA direction;

[0042] Figure 9 is an enlarged view of part a of the centrifugal fan in Figure 8;

[0043] Figure 10 is a cross-sectional view of the centrifugal fan in Figure 5 along the BB direction;

[0044] Figure 11 is an enlarged view of part c of the centrifugal fan in Figure 10;

[0045] Figure 12 is a cross-sectional view of the centrifugal fan in Figure 5 along the CC direction;

[0046] Figure 13 is an enlarged view of the h-section of the centrifugal fan in Figure 2;

[0047] Figure 14 is an enlarged view of part j of the centrifugal fan in Figure 2;

[0048] Figure 15 is a schematic diagram of another part of the structure of the centrifugal fan according to an embodiment of the present invention;

[0049] Figure 16 is a schematic diagram of another part of the structure of the centrifugal fan according to an embodiment of the present invention;

[0050] Figure 17 is an enlarged view of part e of the centrifugal fan in Figure 4;

[0051] Figure 18 is a partial structural schematic diagram of the side plate according to an embodiment of the present invention;

[0052] Figure 19 is a schematic diagram of the side plate according to an embodiment of the present invention;

[0053] Figure 20 is an enlarged view of part k of the side plate in Figure 19;

[0054] Figure 21 is an enlarged view of part f of the centrifugal fan in Figure 4;

[0055] Figure 22 is a schematic diagram of another part of the structure of the centrifugal fan according to an embodiment of the present invention;

[0056] Figure 23 is an enlarged view of part g of the centrifugal fan in Figure 22;

[0057] Figure 24 is another structural schematic diagram of the side plate according to an embodiment of the present invention;

[0058] Figure 25 is an enlarged view of part m of the side plate in Figure 24;

[0059] Figure 26 is a schematic diagram of the structure of the second docking part according to an embodiment of the present invention;

[0060] Figure 27 is a structural schematic diagram of the third docking portion according to an embodiment of the present invention;

[0061] Figure 28 is an enlarged view of part n of the side plate in Figure 24;

[0062] Figure 29 is an enlarged view of part p of the centrifugal fan in Figure 16;

[0063] Figure 30 is another structural schematic diagram of the HVAC indoor unit according to an embodiment of the present invention;

[0064] Figure 31 is a schematic diagram of the structure of the HVAC system according to an embodiment of the present invention.

[0065] Explanation of reference numerals in the attached drawings: HVAC system 2000; HVAC indoor unit 2100; First machine 300; First enclosure 310; Second machine 400; Second enclosure 410; Indoor heat exchanger 420; HVAC outdoor unit 2200; Piping 2300; Compressor 500; Flow path switching device 600; Outdoor heat exchanger 700; Expansion valve 800; Volute 100; Side plate 10; Enclosure plate 20; Volute profile 3001; Fastening part 3002; Mounting hole 3003; Adapter hole 3004; Air outlet area 3005; Air intake area 3006; Near volute tongue wall 3007; Far volute tongue wall 3008; First connection part 3009; Second connection part 3010; Third connecting part 3011; inner surface of the first connecting part 3012; first overlapping groove 3013; inner surface of the second connecting part 3014; second overlapping groove 3015; first substrate 3016; second substrate 3017; fourth connecting part 3018; top surface of the support leg 3019; protrusion 3020; first guide surface 3021; ​​support plane 3022; first support part 3023; second support part 3024; base 3025; elastic claw 3026; first end of elastic claw 3027; second end of elastic claw 3028; disassembly port 3029; outer peripheral surface of the far volute tongue wall 3030; outer peripheral surface of the suction area 3031; abutment Connecting wall 3032; Connecting wall 3033; First elastic cantilever 3034; Third connecting part 3035; Second slot 3036; Second block 3037; Second elastic cantilever 3038; Third limiting part 3039; Fourth limiting part 3040; Third limiting piece 3041; Fourth limiting piece 3042; First convex 3043; First curved surface 3044; Second convex 3045; Second curved surface 3046; Groove 3047; Temperature sensing bulb 3048; Second guide surface 3049; Air inlet 11; Guide ring 30; Base plate 12; Connecting part 13; Top surface of enclosure 21; Boss 130; Mounting plane 1300; Edge 1 4; Gap 15; Support protrusion 16; Support surface 160; Guide surface 161; Volute tongue 22; Air outlet 24; Recess 25; Slot 26; Support leg 40; Mounting base 50; Installation space 51; Through hole 41; Support strip 42; Cable holder 60; Cable groove 61; Flange 70; First mating part 71; Second mating part 72; Insertion slot 710; First slot 7100; First block 720; Insertion interface 7101; First limiting part 711; Second limiting part 721; First limiting piece 7110; Second limiting piece 7210; Centrifugal fan 1000; Impeller 200; Disc 201; Blade 202; Partition 2001. Detailed Implementation

[0066] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0068] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; 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 invention according to the specific circumstances.

[0069] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0070] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0071] Please refer to Figure 1. The HVAC indoor unit 2100 of this embodiment includes the centrifugal fan 1000 described above. The HVAC indoor unit 2100 is a device for regulating air temperature. One HVAC indoor unit 2100 may include one or more centrifugal fans 1000. As an example, one HVAC indoor unit 2100 may include two centrifugal fans 1000. The two centrifugal fans 1000 may be spaced apart along the length of the HVAC indoor unit 2100.

[0072] Please refer to Figures 1 and 2. The centrifugal fan 1000 of this embodiment includes a volute 100 and an impeller 200. The impeller 200 is housed within the volute 100. Thus, the impeller 200 generates airflow by rotating, drawing air or other gases into the volute 100, accelerating them, and then discharging them from the volute 100.

[0073] Specifically, the impeller 200 is a rotating component in the HVAC indoor unit 2100. The rotation of the impeller 200 can be driven by a drive motor. The volute 100 can be used to guide airflow and improve gas flow efficiency. In the HVAC indoor unit 2100, the volute 100 can be the outer casing of the centrifugal fan 1000.

[0074] Please refer to Figure 2. In some embodiments, the impeller 200 includes a disk 201 and a plurality of blades 202, which are arranged circumferentially on the disk 201. Thus, the impeller 200 consists of a disk 201 and a plurality of blades 202 arranged circumferentially on the disk 201. This design helps to generate and accelerate airflow more effectively, improving the airflow efficiency of the centrifugal fan 1000. The blades 202 and the disk 201 can be integrally formed, or they can be manufactured separately and then assembled by welding, threaded connections, or other methods.

[0075] Please refer to Figures 2, 3, and 4. The volute 100 of this embodiment includes a surrounding plate 20 and two opposing side plates 10. The surrounding plate 20 extends circumferentially to form a volute profile 3001. The two opposing side plates 10 are respectively connected to both sides of the surrounding plate 20, and at least one side plate 10 is provided with an air inlet 11; wherein, at least one side plate 10 is detachably connected to the surrounding plate 20, at least one side plate 10 is made of a first material, and the surrounding plate 20 is made of a second material, the density of the first material being less than the density of the second material.

[0076] In the volute 100 of this embodiment, when both the side plate 10 and the surrounding plate 20 are made of high-density materials, the weight of the volute 100 is relatively large, resulting in higher transportation and installation costs. When both the side plate 10 and the surrounding plate 20 are made of low-density materials, the weight of the volute 100 is smaller, but the manufacturing cost of the volute 100 is higher because low-density materials are generally more complex to manufacture. Therefore, within the same volume, by making at least one side plate 10 of a first material with lower density, the volute 100 can achieve the advantages of light weight and low cost, i.e., lower transportation, installation, and manufacturing costs while maintaining a lower weight. Furthermore, since the surrounding plate 20 is made of a second material with higher density, the overall structural strength of the volute 100 still meets the requirements. By providing an air inlet 11 on the side plate 10, airflow into the volute 100 can be more effectively controlled and guided, thereby increasing airflow inside the volute 100 and improving heat dissipation efficiency.

[0077] Furthermore, the detachable connection design allows the side plates 10 and the surrounding plates 20 of the volute 100 to be produced separately in batches and then assembled. This modular production method can improve production efficiency and reduce the complexity and cost of the production process. At the same time, the detachable design of the side plates 10 and the surrounding plates 20 also facilitates later maintenance and replacement, improves assembly efficiency, and increases the dimensional adaptability of the volute 100. When it is necessary to change the size of the volute 100, only the width of the surrounding plates 20 needs to be changed. That is to say, different widths of the surrounding plates 20 are adapted to the same side plates 10. Therefore, the dimensional adaptability of the volute 100 design of this application is improved, and it is not necessary to re-mold all parts, reducing production costs and production time.

[0078] Specifically, the side plates 10 can be flat plate structures forming both sides of the volute 100. The side plates 10 can be used to provide support and enclosure. The two side plates 10 can be arranged opposite each other along the length and width directions of the volute 100. As an example, the two side plates 10 can be spaced apart from each other, and the two side plates 10 can be arranged opposite each other along the length direction of the volute 100.

[0079] The enclosure 20 can be used to fix and connect the two side panels 10. The connection between the enclosure 20 and the side panels 10 can be a detachable connection such as a threaded connection or a snap-fit ​​connection.

[0080] Density refers to the mass per unit volume of a material. The density of side panel 10 is less than that of enclosure panel 20, meaning that the material used in side panel 10 is lighter than that in enclosure panel 20. The first material can be a low-density material such as ABS (Acrylonitrile Butadiene Styrene) plastic, polypropylene, or carbon fiber reinforced plastic. The second material can be a high-density material such as stainless steel, aluminum plate, or galvanized iron plate.

[0081] An air inlet 11 refers to an opening provided on the side plate 10, which serves as an inlet for airflow into the volute 100. The shape of the air inlet 11 can be a regular shape such as a circle or square, or it can be an irregular shape. One air inlet 11 can be provided on the side plate 10. The air inlet 11 can be located in the middle of the side plate 10. Multiple air inlets 11 can also be provided on the side plate 10. The number of air inlets 11 can be two, three, four, or even more.

[0082] In some implementations, the first material is plastic and the second material is metal.

[0083] Compared to plastic, metal has a higher density. When the side plate 10 and the surrounding plate 20 are made of metal, the volute 100 is heavier, resulting in higher transportation and installation costs. When the side plate 10 and the surrounding plate 20 are made of plastic, the volute 100 is lighter, but its manufacturing cost is higher. Therefore, for the same volume, by using at least one side plate 10 made of a lower-density material, such as plastic, and the surrounding plate 20 made of metal, the volute 100 is lighter and its manufacturing cost is relatively lower, thus reducing transportation and installation costs. Furthermore, since the surrounding plate 20 is a metal plate, the overall structural strength of the volute 100 still meets the requirements.

[0084] Please refer to Figures 2 and 4. In some embodiments, each side plate 10 has a base plate 12 configured to form the outer shape of the volute 100. The side plate 10 made of a first material has a connecting portion 13 extending from the base plate 12 toward the other side plate 10 and detachably overlapping the edge of the surrounding plate 20. Of course, the side plate 10 may not be made of the first material, or both side plates 10 may have the connecting portion 13.

[0085] Thus, the connecting portion 13 is detachably overlapped at the edge of the enclosure panel 20, a design that enhances the connection strength between the side panel 10 and the enclosure panel 20. The connecting portion 13 structure provides additional contact area and support, making the connection more stable. Furthermore, the connecting portion 13 can also serve as an assembly reference, facilitating alignment during the assembly process of the side panel 10 and the enclosure panel 20, thereby reducing the gap between them, which in turn reduces the risk of airflow leakage and noise.

[0086] Specifically, the substrate 12 can be the main part of the side plate 10. The connecting part 13 can be formed on the edge of the substrate 12 by means of folding, injection molding or the like.

[0087] Please refer to Figures 2 and 5. In some embodiments, the two side plates 10 are configured to be mirror-symmetrical. This facilitates the integral machining and forming of the volute 100.

[0088] Please refer to Figures 4, 5, 6, 7, and 12. In some embodiments, the connecting portion 13 extends circumferentially along the volute profile 3001, and the connecting portion 13 has a plurality of fastening portions 3002, which are spaced apart along the circumferential extension trajectory. The plurality of fastening portions 3002 are detachably connected to the edge portion of the surrounding plate 20.

[0089] Thus, the fastening part 3002 can enhance the connection reliability between the side plate 10 and the surrounding plate 20, increase the rigidity of the entire volute 100 structure, and reduce structural deformation caused by vibration during operation or external impact. By providing multiple fastening parts 3002 on the connecting part 13 and arranging them at circumferential intervals, the connection stability between the side plate 10 and the surrounding plate 20 can be enhanced. This multi-point connection method provides more fixing points, making the entire volute 100 structure more stable.

[0090] Specifically, the connecting portion 13 can extend continuously and integrally along the circumferential profile line 3001. Alternatively, the connecting portion 13 can extend intermittently along the circumferential profile line 3001. For example, along the circumferential profile line 3001, the connecting portion 13 can be divided into three segments, with adjacent segments spaced apart.

[0091] The connecting part 13 and the surrounding plate 20 may be provided with corresponding threaded holes, riveting holes, etc. The fastening part 3002 is used to fix the side plate 10 and the surrounding plate 20. The fastening part 3002 may include threaded holes, riveting holes, etc., which, together with mechanical components such as screws, bolts, or rivets, achieve the fixation of the side plate 10 and the surrounding plate 20. For example, the connecting part 13 and the surrounding plate 20 may be provided with multiple corresponding threaded holes, and the side plate 10 and the surrounding plate 20 are fastened by using bolts passed through these threaded holes. The fastening part 3002 may also be a welding area, where the side plate 10 and the surrounding plate 20 are fixed by welding.

[0092] Please refer to Figures 5, 8, and 9. In some embodiments, the side plate 10 made of the first material has a flange 14 opposite to the connecting portion 13, and a gap 15 is formed between the flange 14 and the connecting portion 13, with the edge portion of the surrounding plate 20 inserted into the gap 15. Of course, the side plate 10 may not be made of the first material, or both side plates 10 may have flanges 14 opposite to the connecting portion 13.

[0093] Thus, this design, through the cooperation of the flange 14 and the connecting part 13, provides additional support and fixation for the enclosure 20, enhancing the stability of the entire volute 100 structure. Simultaneously, the flange 14 can also block airflow, preventing airflow leakage from inside the volute 100. Furthermore, the gap 15 formed by the flange 14 and the connecting part 13 serves as a guide for the insertion of the enclosure 20, improving the accuracy of the assembly of the enclosure 20 and the side plate 10, ensuring proper alignment and fixation of the enclosure 20 and the side plate 10, reducing assembly errors, thereby reducing the gap between the side plate 10 and the enclosure 20, and consequently reducing the risk of airflow leakage and noise.

[0094] Specifically, the flange 14 and the substrate 12 can be integrally formed. For example, the flange 14 and the substrate 12 can be formed by injection molding. Alternatively, the flange 14 and the substrate 12 can be manufactured separately and then assembled. For example, the flange 14 and the substrate 12 can be processed separately and then assembled by bonding or welding.

[0095] Please refer to Figures 10 and 11. In some embodiments, the retaining edge 14 is provided with a support protrusion 16, which is located in the gap 15 and abuts against the edge of the surrounding plate 20.

[0096] Thus, the support protrusion 16 provides additional support points, enhancing the structural strength of the volute 100. The presence of the support protrusion 16 makes the connection between the flange 14 and the surrounding plate 20 more stable, reducing displacement caused by external forces or vibrations, thereby improving the overall stability of the volute 100 structure.

[0097] Specifically, the support protrusion 16 can protrude from one side of the retaining edge 14 toward the surrounding plate 20. The retaining edge 14 and the support protrusion 16 can be integrally formed. For example, the retaining edge 14 and the support protrusion 16 can be formed by injection molding. The retaining edge 14 and the support protrusion 16 can also be manufactured separately and then assembled. For example, the retaining edge 14 and the support protrusion 16 can be processed separately and then assembled by adhesive bonding.

[0098] Please refer to Figures 5, 8, and 9. In some embodiments, the support protrusion 16 includes a support surface 160 and a guide surface 161 connected to the support surface 160. The support surface 160 is connected to the substrate 12, and the distance between the guide surface 161 and the connecting portion 13 decreases along the direction e toward the substrate 12.

[0099] Thus, the distance between the guide surface 161 and the connecting part 13 decreases along the direction e toward the substrate 12. This design forms a progressive guiding structure, which helps guide the edge of the enclosure 20 to smoothly enter the gap 15, reducing resistance and alignment difficulty during assembly, and allowing the edge of the enclosure 20 to be inserted into the gap 15 more smoothly during assembly.

[0100] Specifically, the support surface 160 supports the enclosure 20. The guide surface 161 guides the enclosure 20 to move to the support surface 160. Along the height direction of the volute 100, the support surface 160 can be located above and to the side of the guide surface 161. Along the direction e toward the substrate 12, the distance between the guide surface 161 and the connecting portion 13 decreases from D3 to D4. Here, D3 is the distance between the end of the guide surface 161 away from the substrate 12 and the connecting portion 13, and D4 is the distance between the end of the guide surface 161 near the substrate 12 and the connecting portion 13.

[0101] Please refer to Figures 8 and 9. In some embodiments, along the thickness direction d of the substrate 12, the dimension D1 of the connecting portion 13 is larger than the dimension D2 of the retaining edge 14.

[0102] Thus, since the dimension D1 of the connecting part 13 is larger than the dimension D2 of the flange 14, the enclosure 20 is easily inserted into the gap 15 during assembly. Furthermore, the dimension D2 of the flange 14 is relatively small, thus requiring less material, which helps reduce manufacturing costs.

[0103] Specifically, the thickness direction d of the substrate 12 refers to the vertical distance from one side of the substrate 12 to the other side.

[0104] Please refer to Figures 8 and 9. In some embodiments, the distance between the support surface 160 and the connecting portion 13 is equal everywhere.

[0105] Thus, the distance between the support surface 160 and the connecting part 13 is equal everywhere. This design ensures that the supporting force of the support protrusion 16 on the surrounding plate 20 is evenly distributed, reducing local stress concentration and thus improving the durability and reliability of the structure.

[0106] Specifically, the distance between the support surface 160 and the connecting part 13 refers to the minimum distance between the areas of the support surface 160 and the connecting part 13 that are opposite each other.

[0107] Please refer to Figures 4 and 7. In some embodiments, there are multiple support protrusions 16, which are arranged at intervals along the circumferential direction r of the volute profile 3001.

[0108] Thus, multiple support protrusions 16 are arranged at intervals along the circumferential r of the volute profile 3001. This design ensures that the support force is evenly distributed around the entire volute 100, improving the overall stability and load-bearing capacity of the structure.

[0109] Specifically, the number of support protrusions 16 can be two, three, four, or even more. The extension direction of the flange 14 can be the same as the circumferential direction r of the volute profile 3001.

[0110] Please refer to Figures 3 and 7. In some embodiments, the fastening part 3002 is configured as a boss 130, which protrudes from the side of the connecting part 13 away from the surrounding plate 20. A mounting hole 3003 is provided through the boss 130 away from the top surface 21 of the surrounding plate 20. The mounting hole 3003 is opposite to the adapter hole 3004 on the edge side of the surrounding plate 20 for fasteners to pass through and fix.

[0111] Thus, the protrusion 130 can play a reinforcing role, thereby enabling the fastener to provide a stable fastening force, thereby improving the connection stability of the side plate 10 and the surrounding plate 20.

[0112] Specifically, the boss 130 can protrude from one side of the connecting portion 13 in a direction away from the surrounding plate 20. The boss 130 can be integrally formed with the connecting portion 13, or it can be manufactured separately from the connecting portion 13 and then assembled.

[0113] There can be multiple bosses 130, and these bosses 130 can be spaced apart. Each boss 130 can have one or more mounting holes 3003. The number of mounting holes 3003 can correspond one-to-one with the number of adapter holes 3004. The central axis of the mounting hole 3003 can be collinear with the central axis of the adapter hole 3004. The mounting hole 3003 can be a threaded hole, a riveting hole, etc. The fastener can be a screw, bolt, or rivet, etc.

[0114] In some implementations, the fasteners include rivets.

[0115] Thus, the use of rivets allows the overall structure of the enclosure plate 20 and the side plate 10 to withstand high loads and repeated mechanical stresses, which enhances the connection strength between the side plate 10 and the enclosure plate 20. Furthermore, the rivet connection structure reduces relative movement between the side plate 10 and the enclosure plate 20, lowering noise caused by vibration.

[0116] Please refer to Figures 6 and 7. In some embodiments, the boss 130 is configured as a planar surface away from the top surface 21 of the enclosure 20, and the top surface 21 of the boss 130 away from the enclosure 20 abuts against the head surface of the fastener. The top surface 21 of the boss 130 away from the enclosure 20 can be a mounting plane 1300.

[0117] During the contact process between the fastener and the curved structure, the top surface may deform, leading to functional failure of the fastener after long-term use. Therefore, by constructing the top surface 21 of the boss 130 away from the surrounding plate 20 as a flat surface and setting the top surface and the head of the fastener to be in a face-to-face contact manner, the possibility of deformation of the top surface can be reduced, thereby ensuring the functional stability of the fastener. This helps to reduce the possibility of fastener loosening, thereby reducing noise and structural damage caused by vibration.

[0118] Please refer to Figures 2, 3, and 12. In some embodiments, the volute profile 3001 is configured as an outlet zone 3005, an intake zone 3006, and a volute tongue 22 located between the outlet zone 3005 and the intake zone 3006. The outlet zone 3005 includes a near-volute tongue wall 3007 and a far-volute tongue wall 3008 disposed opposite to each other. The near-volute tongue wall 3007 is connected to the intake zone 3006 via the volute tongue 22. Airflow flows through the air inlet 11, through the intake zone 3006, to the outlet zone 3005, and exits the volute 100 from the outlet zone 3005.

[0119] The connecting part 13 includes a first connecting part 3009, a second connecting part 3010, and a third connecting part 3011. The first connecting part 3009 extends along the profile of the distal volute tongue wall 3008 and is detachably overlapped and fixed to the distal volute tongue wall 3008. The second connecting part 3010 extends along the profile of the proximal volute tongue wall 3007 and is detachably overlapped and fixed to the proximal volute tongue wall 3007. The third connecting part 3011 extends along the profile of the suction zone 3006 and is detachably overlapped and fixed to the plate wall of the suction zone 3006.

[0120] Thus, the connecting portion 13 is divided into a first connecting portion 3009, a second connecting portion 3010, and a third connecting portion 3011, extending along the profiles of the far volute tongue wall 3008, the near volute tongue wall 3007, and the suction zone 3006, respectively. This design allows the connecting portion 13 to fit more closely with the profile of the volute 100, enhancing the stability and integrity of the structure. Furthermore, each connecting portion 13 is detachably overlapped and fixed to its corresponding part of the volute 100, making the assembly and maintenance of the volute 100 more convenient. Any part can be disassembled and replaced individually without disassembling the entire volute 100. The volute tongue 22 can be used to guide and stabilize airflow. The volute tongue 22 can serve as a transition section from the suction zone 3006 to the outlet zone 3005, thereby stabilizing the airflow transition, reducing turbulence and eddies, and improving the overall air outlet efficiency of the volute 100.

[0121] Specifically, the suction zone 3006 can be formed by connecting at least two curved segments and at least one straight segment. For example, the bottom of the suction zone 3006 can be set as a straight segment, which can reduce the overall height of the volute 100, thus making it suitable for some installation scenarios with height restrictions.

[0122] The air outlet zone 3005 can be set as a downward-sloping straight line segment. The inclination rate of the near-volute tongue wall 3007 can be greater than that of the far-volute tongue wall 3008. This is because the airflow volume near the near-volute tongue wall 3007 is greater than that near the far-volute tongue wall 3008; therefore, having a greater inclination rate near the near-volute tongue wall 3007 is beneficial for increasing the overall airflow volume of the volute 100.

[0123] The near volute tongue wall 3007, the far volute tongue wall 3008, the first substrate 3016, and the second substrate 3017 together form an air outlet 24. The shape of the air outlet 24 can be a regular shape such as a circle or a square, or it can be an irregular shape. During the operation of the centrifugal fan 1000, the airflow can enter the interior of the volute 100 through the air inlet 11, and then, under the action of the impeller 200, flow along the suction zone 3006 towards the air outlet zone 3005, and flow out of the volute 100 from the air outlet 24.

[0124] Please refer to Figure 2. In some embodiments, the middle portion of the volute tongue 22 along the axial direction z of the air inlet 11 is provided with a recess 25 that is recessed away from the far volute tongue wall 3008.

[0125] During use, the airflow distribution from the volute 100 is uneven. Specifically, along the axial direction z of the air inlet 11, the airflow is greater closer to the center of the volute tongue 22, and the airflow velocity is correspondingly faster where the airflow volume is greater. Therefore, due to the relatively low position of the recess 25, the flow area at the location of the recess 25 can be effectively increased, thereby reducing the airflow velocity at the recess 25. This makes the airflow velocity at the location of the recess 25 consistent with the airflow velocity on both sides of the recess 25 on the volute tongue 22, achieving uniform airflow in the air outlet 24 area.

[0126] Thus, with the same operating noise level, more airflow can pass through the air outlet 24, allowing the volute 100 to meet the air conditioning needs of larger spaces. Correspondingly, with the same air volume, the centrifugal fan 1000 equipped with the volute 100 of this embodiment has lower operating noise, improving the user comfort of the centrifugal fan 1000. Correspondingly, with the same air volume and the same operating noise level, the volute 100 has a smaller volume, meeting the requirements of lower cost or adapting to more diverse installation spaces 51.

[0127] Specifically, the recess 25 may be a groove formed on the volute tongue 22 by a process such as stamping. The recess 25 may include one or more grooves.

[0128] In some embodiments, at least one side plate 10 has a retaining edge 14 extending from the base plate 12 toward the other side plate 10. The retaining edge 14 is located within the suction zone 3006 and is disposed opposite to the third connecting portion 3011 to form a gap 15. The edge portion of the surrounding plate 20 is inserted into the gap 15. Inside the volute 100, gas turbulence typically forms within the suction zone 3006. Therefore, many gases with different flow directions attack the edges of the suction zone 3006 inside the volute 100, especially the area of ​​the suction zone 3006 near the third connecting portion 3011. Therefore, there is a risk of leakage at the edge of the suction zone 3006 near the third connecting portion 3011. Therefore, providing the retaining edge 14 opposite to the third connecting portion 3011 within the suction zone 3006 can reduce the risk of gas leakage from the edge of the suction zone 3006.

[0129] During assembly, additional support components can be installed on the air outlet zone 3005 to facilitate the fixing of the enclosure 20 of the air outlet zone 3005. For example, fasteners can be used to connect the enclosure 20 and the side panel 10. However, the location of the air inlet zone is not easily visible, which may lead to improper assembly when using fasteners to connect the enclosure 20 and the side panel 10. Therefore, a baffle is provided in the air intake zone 3006 to provide support and limit the movement, thereby facilitating the fixing of the enclosure 20.

[0130] In some embodiments, the side panel 10 made of the first material has a retaining edge 14. The side panel 10 made of the relatively lightweight first material is prone to forming gaps under the impact of airflow, so by providing a retaining edge 14 to the side panel 10 made of the first material, the risk of airflow leakage can be effectively reduced.

[0131] Please refer to Figures 2, 13, and 14. In some embodiments, the surfaces of the first connecting portion 3009 and the second connecting portion 3010 facing the enclosure 20 are defined as inner surfaces. The inner surface 3012 of the first connecting portion 3009 is recessed with a first overlapping groove 3013, and the distal volute tongue wall 3008 overlaps within the first overlapping groove 3013. The inner surface 3014 of the second connecting portion 3010 is recessed with a second overlapping groove 3015, and the proximal volute tongue wall 3007 overlaps within the second overlapping groove 3015.

[0132] Thus, during assembly, the first overlapping groove 3013 can serve as a positioning reference between the first connecting part 3009 and the distal volute tongue wall 3008; the second overlapping groove 3015 can serve as a positioning reference between the second connecting part 3010 and the proximal volute tongue wall 3007. The overlapping grooves help reduce the height difference between the top surface 21 of the enclosure 20 and the inner surface 3014 of the first connecting part 3009 or the second connecting part 3010, thereby facilitating airflow through the air outlet area 3005 and improving the overall air outlet efficiency of the volute 100.

[0133] Specifically, the first overlap groove 3013 can be formed by injection molding. The second overlap groove 3015 can be formed by injection molding.

[0134] Please refer to Figures 2, 13, and 14. In some embodiments, the inner surface 3012 of the first connecting portion 3009 is flush with the proximal volute tongue wall 3007, and the inner surface 3014 of the second connecting portion 3010 is flush with the distal volute tongue wall 3008.

[0135] Thus, by aligning the inner surface 3012 of the first connecting part 3009 with the near volute tongue wall 3007 and the inner surface of the second connecting part 3010 with the far volute tongue wall 3008, airflow is facilitated through the air outlet area 3005, thereby improving the overall air outlet efficiency of the volute 100.

[0136] Please refer to Figures 4 and 15. In some embodiments, each substrate 12 includes a first substrate 3016 and a second substrate 3017. The two first substrates 3016 cover both sides of the suction area 3006, and the two second substrates 3017 cover both sides of the exhaust area 3005. The two first substrates 3016 are parallel to each other. In the direction f from upstream to downstream of the exhaust area 3005, the two second substrates 3017 extend at an angle away from each other. The second substrate 3017, made of a first material, has a first connecting portion 3009 and a second connecting portion 3010. The widths of the first connecting portion 3009 and the second connecting portion 3010 gradually increase in the direction f from upstream to downstream of the exhaust area 3005. The first overlapping groove 3013, the second overlapping groove 3015, and the third connecting portion 3011 are of equal width.

[0137] Thus, when the centrifugal fan 1000 is working, the impeller 200 draws outside air into the volute 100 through the air inlet 11 and blows it towards the indoor heat exchanger 420 through the air outlet 3005. Since the two second base plates 3017 extend away from each other, the air passing through the area between the two second base plates 3017 can be diffused during the process of blowing towards the indoor heat exchanger 420, converting the dynamic pressure of the air outlet 3005 into static pressure as much as possible, and at the same time reducing the wind speed at the air outlet 3005, which is beneficial to reducing the operating noise of the HVAC system 2000.

[0138] Furthermore, the gradual increase in width f of the first connecting portion 3009 and the second connecting portion 3010 from upstream to downstream of the air outlet zone 3005 increases the area of ​​the airflow directly blowing onto the indoor heat exchanger 420, improving the heat exchange effect of the indoor heat exchanger 420. It also prevents concentrated airflow from impacting the indoor heat exchanger 420, further reducing the operating noise of the HVAC system 2000. Therefore, the centrifugal fan 1000 using the volute 100 of this embodiment of the invention is beneficial for improving the heat exchange effect of the HVAC system 2000 while effectively reducing its operating noise.

[0139] Because the first overlapping groove 3013, the second overlapping groove 3015, and the third connecting part 3011 are all of equal width, it is beneficial to save material during manufacturing, thereby reducing manufacturing costs. Since the overlapping grooves are manufactured based on the largest possible size, unequal widths would lead to material waste.

[0140] Specifically, in the direction f from upstream to downstream of the air outlet area 3005, the distance between the two second substrates 3017 increases from D5 to D6. Here, D5 is the distance between the two ends of the two second substrates 3017 away from the air outlet area 3005, and D6 is the distance between the two ends of the two second substrates 3017 close to the air outlet area 3005.

[0141] Please refer to Figure 16. In some embodiments, the connecting portion 13 further includes a fourth connecting portion 3018, which is connected between the second connecting portion 3010 and the third connecting portion 3011, extends along the profile of the volute tongue 22 and supports the volute tongue 22.

[0142] Thus, the fourth connecting part 3018 can make the position of the volute tongue 22 more stable, thereby reducing noise.

[0143] Specifically, one end of the fourth connecting part 3018 can be connected to the second connecting part 3010. The other end of the fourth connecting part 3018 can be connected to the third connecting part 3011. The second connecting part 3010, the third connecting part 3011, and the fourth connecting part 3018 can be integrally formed by injection molding, which can reduce the number of seams and thus further reduce noise.

[0144] Please refer to Figures 2 and 4. In some embodiments, each side plate 10 has a base plate 12 configured to form the shape of a volute 100, at least one side plate 10 is made of plastic, the surrounding plate 20 is made of metal, the space between the two base plates 12 is defined as the inner side, and the side plate 10 made of the first material has a guide ring 30 integrally extended inward from the base plate 12, the guide ring 30 forming an air inlet 11.

[0145] Thus, the guide ring 30 can smooth and guide the airflow, reducing turbulence and noise when the airflow enters the volute 100. The guide ring 30 is located at the edge of the air inlet 11, which helps to guide the airflow through the air inlet 11 more effectively, reducing airflow turbulence and the generation of eddies.

[0146] Specifically, the guide ring 30 can be connected to the side plate 10. The guide ring 30 can protrude from one side of the side plate 10 in the direction toward the impeller 200. The guide ring 30 can surround the periphery of the air inlet 11. The shape of the guide ring 30 can match the shape of the air inlet 11. For example, for a circular air inlet 11, the shape of the guide ring 30 can be annular.

[0147] Please refer to Figure 4. In some embodiments, each side plate 10 has a guide ring 30, the guide rings 30 of the two side plates 10 extend toward each other, and the two air inlets 11 formed by the two side plates 10 are coaxially arranged.

[0148] Thus, the two coaxially arranged air inlets 11 allow air to enter evenly from both sides, reducing airflow deflection and eddies.

[0149] Specifically, coaxial arrangement means that the centers of the two air inlets 11 are located on the same axis.

[0150] In some embodiments, both side plates 10 are made of a single piece of plastic. This reduces the overall weight of the two side plates 10, thereby reducing the overall weight of the volute 100.

[0151] Please refer to Figures 2 and 4. In some embodiments, the side plate 10 and the guide ring 30 are integrally formed.

[0152] Thus, the one-piece molded structure eliminates potential seams between the side plate 10 and the air deflector 30, thereby reducing the possibility of air leakage and noise and vibration caused by airflow impact. Furthermore, since there are no seams or connection points between the side plate 10 and the air deflector 30, structural weaknesses caused by improper connections or prolonged use are reduced. Additionally, the one-piece molded side plate 10 and air deflector 30 reduce additional assembly steps, simplifying the manufacturing process.

[0153] Specifically, the side plate 10 and the guide ring 30 can be integrally formed by injection molding, 3D printing, or other methods.

[0154] In some embodiments, one of the two side panels 10 is made of plastic, while the other side panel 10 and the surrounding panel 20 are made of metal. The plastic side panel 10 forms an air inlet 11, and the metal side panel 10 mounts a drive motor. Thus, both the plastic and metal side panels 10 can achieve the advantages of lightweight construction and drive motor mounting. The plastic side panel 10 can be used to form the air inlet 11 while reducing weight, while the metal side panel 10 can improve the mounting stability of the drive motor.

[0155] Please refer to Figure 2. In some embodiments, a groove 26 is provided at the edge of the volute tongue 22 along the axial direction z of the air inlet 11, and the groove 26 is recessed in a direction away from the far volute tongue wall 3008.

[0156] Thus, during the operation of the centrifugal fan 1000 equipped with the volute 100 of this embodiment, the minimum clearance between the volute tongue 22 and the outer edge of the impeller 200 can be ensured by setting the groove 26. At the same time, the impact of airflow on the volute tongue 22 can be reduced, the flow field inside the volute 100 can be optimized, and the generation of vortices in the airflow at the volute tongue 22 can be effectively suppressed. While ensuring the performance of the centrifugal fan 1000, the vortex noise of the centrifugal fan 1000 can be effectively reduced, thereby improving the user comfort of the centrifugal fan 1000 and ensuring the air delivery efficiency of the centrifugal fan 1000.

[0157] Specifically, the groove 26 can be formed by processes such as stamping. The groove 26 can be located on opposite sides of the volute tongue 22. There can be one or more grooves 26. For example, a groove 26 can be provided on each opposite side of the volute tongue 22.

[0158] Please refer to Figures 2, 4, and 17. In some embodiments, the volute 100 further includes legs 40, and both the legs 40 and the side plates 10 are integrally formed from a first material.

[0159] Thus, since both the support leg 40 and the side plate 10 are integrally formed from the same material, this not only reduces the overall weight of the support leg 40 and the side plate 10, but also simplifies the manufacturing and assembly process of the entire volute 100, reducing the manufacturing cost of the volute 100. The integrally formed side plate 10 and support leg 40 reduce potential positional deviations during assembly, ensuring structural accuracy and consistency. By eliminating positional deviations caused by improper assembly, the noise generated by the volute 100 during operation is reduced. Furthermore, since there are no seams or connection points between the support leg 40 and the side plate 10, structural weaknesses caused by improper connections or prolonged use are reduced.

[0160] In addition, the support legs 40 provide additional support points for the entire volute 100 structure, enhancing its stability during installation or operation and reducing displacement or tilting caused by vibration or external forces. Furthermore, the addition of the support legs 40 allows the volute 100 to adapt to uneven mounting surfaces, providing more installation options and making it easier to install the volute 100 on various different surfaces.

[0161] Specifically, there can be multiple support legs 40. For example, one support leg 40 can be provided at each end of the volute 100 along its length. The support legs 40 can be detachably connected to the side plate 10 using mechanical components such as bolts and screws, or they can be non-detachably connected by welding, riveting, or other methods. The support legs 40 can be installed on the bottom, side, or other positions of the volute 100 to provide support for the side plate 10 or other components in different directions. The support and the side plate 10 can be integrally formed by injection molding, 3D printing, or other methods.

[0162] Please refer to Figures 17 and 18. In some embodiments, the support leg 40 is provided with a mounting base 50 for mounting the temperature sensor 3048.

[0163] In this way, the temperature sensor 3048 can directly measure the temperature of the installation area, which can be used as the air intake temperature of the HVAC system 2000, providing accurate temperature data for the HVAC system 2000. This data can then serve as a direct basis for adjusting the functional parameters of the HVAC system 2000, enabling the HVAC system 2000 to adjust more accurately according to the actual ambient temperature.

[0164] In addition, since the mounting base 50 is located on the support leg 40, space can be saved, avoiding the need to install an additional temperature sensor 3048 in the limited space, thus improving space utilization efficiency.

[0165] Specifically, the temperature sensing element 3048 may include one or more temperature sensors. The temperature sensors can be used to detect the ambient temperature in the area of ​​the mounting base 50. The mounting base 50 may include fixing and limiting structures to define the position of the temperature sensing element 3048. One mounting base 50 may mount one or more temperature sensing elements 3048. The number of mounting bases 50 may be one or more. A support leg 40 may include one or more mounting bases 50. For example, the number of support legs 40 and mounting bases 50 may be two, with the two support legs 40 respectively disposed on two mounting bases 50.

[0166] Please refer to Figures 18, 19, and 20. In some embodiments, the mounting base 50 has a mounting space 51 for accommodating the temperature sensing bulb 3048.

[0167] In this way, the temperature sensor 3048 is installed in the installation space 51, maintaining the neatness and aesthetics of the volute 100 and avoiding the clutter caused by additional accessories.

[0168] Please refer to Figures 18, 19, and 20. In some embodiments, the mounting base 50 has a plurality of through holes 41, and a support strip 42 is provided between two adjacent through holes 41. The support strip 42 protrudes from one side of the top surface 3019 of the support leg 40 and is located at the bottom of the mounting space 51.

[0169] Thus, the multiple through holes 41 on the support leg 40 are designed for ventilation, enhancing the heat dissipation performance of the area and effectively preventing heat accumulation. This helps ensure that the temperature data measured by the temperature sensor 3048 is not interfered with by the surrounding heat accumulation, improving the reliability of temperature measurement. The support bar 42 reduces the contact area between the mounting base 50 and the temperature sensor 3048, increasing the ventilation space around the temperature sensor 3048, which is beneficial for heat dissipation of the temperature sensor 3048 and further improves the accuracy of temperature measurement.

[0170] Furthermore, the through-hole 41 design reduces the amount of material used in the support 40, achieving weight reduction and helping to lower material costs, thereby directly reducing manufacturing costs. The through-hole 41 design facilitates liquid flow during injection molding, reduces shrinkage during the injection molding process, and improves the molding quality and production efficiency of the support 40.

[0171] Specifically, the number of through holes 41 can be two, three, four, or even more. The through holes 41 are spaced apart from each other. A support strip 42 can be provided in the space between two adjacent through holes 41. The support strip 42 can protrude from one side of the support leg 40 in a direction opposite to the support leg 40. The support strip 42 can be integrally formed with the support leg 40. Alternatively, the support strip 42 can be manufactured separately from the support leg 40 and then assembled.

[0172] Please refer to Figure 20. There are multiple support bars 42, which are arranged at intervals. Along the arrangement direction of the multiple support bars 42, the support bar 42 located in the middle of the multiple support bars 42 is provided with a protrusion 3020, which extends to the side away from the installation space 51.

[0173] Thus, the rib 3020 can support the strength of the support bar 42. The center of gravity of the support is generally concentrated in the middle position, so setting the rib 3020 on the support bar 42 in the middle of the multiple support bars 42 can increase the stability of the support bar 42 when it is supported.

[0174] Please refer to Figure 20. In some embodiments, the support bar 42 includes a first guide surface 3021 and a support plane 3022, the support plane 3022 facing the mounting space 51 and for mounting the temperature sensor 3048, and the first guide surface 3021 extending from the support plane 3022 toward the top surface 3019 near the support leg 40 in the direction toward the side plate 10.

[0175] Thus, the support plane 3022 can be used to install the temperature sensor 3048, allowing the temperature sensor 3048 to be stably housed within the installation space 51. The support plane 3022 is located above the top surface 3019 of the support leg 40, and the first guide surface 3021 extends from the support plane 3022 towards the top surface 3019 of the support leg 40, meaning that the first guide surface 3021 is inclined downward relative to the top surface 3019 of the support leg 40. Therefore, the first guide surface 3021 can guide the temperature sensor 3048, thereby facilitating the installation and removal of the temperature sensor 3048 and improving the efficiency of its installation and removal.

[0176] Please refer to Figure 20. In some embodiments, the size of the support plane 3022 along the thickness direction of the side plate 10 is configured to be larger than the size of the temperature sensor 3048. This prevents the temperature sensor 3048 from slipping when mounted on the support plane 3022, thereby improving the stability of the temperature sensor 3048 during use.

[0177] Please refer to Figure 20. In some embodiments, the support bar 42 includes a first support portion 3023 and a second support portion 3024 connected to the first support portion 3023. The second support portion 3024 is close to the mounting space 51. Along the arrangement direction of the plurality of support bars 42, the size of the second support portion 3024 is smaller than the size of the first support portion 3023. The second support portion 3024 is used to support the temperature sensing bulb 3048.

[0178] Thus, the smaller size of the second support portion 3024 can further reduce the contact area between the mounting base 50 and the temperature sensing bulb 3048, increase the ventilation space around the temperature sensing bulb 3048, which is conducive to the heat dissipation of the temperature sensing bulb 3048 and further improves the accuracy of temperature measurement.

[0179] Please refer to Figures 18 and 20. In some embodiments, the mounting base 50 includes a base 3025 and an elastic claw 3026. The base 3025 is connected to the side plate 10, and the elastic claw 3026 protrudes from the side of the base 3025 away from the side plate 10. The elastic claw 3026 and the support bar 42 form a mounting space 51.

[0180] Thus, the elastic claw 3026, in conjunction with the support bar 42, restricts the position of the temperature sensor 3048, making it less prone to movement and reducing the probability of the temperature sensor 3048 falling off during use, transportation, and installation. Furthermore, the elastic claw 3026 can undergo elastic deformation, facilitating the removal of the temperature sensor 3048 from the installation space 51.

[0181] Specifically, the resilient claw 3026 can be a claw-shaped structure made of an elastic material. There can be multiple resilient claws 3026. These multiple resilient claws 3026 can be spaced apart along the length or width of the mounting base 50.

[0182] Please refer to Figures 17, 18, and 20. In some embodiments, the first end 3027 of the elastic claw 3026 is a free end, and the second end 3028 of the elastic claw 3026 is fixedly connected to the base 3025. The free end can move elastically relative to the support leg 40.

[0183] Thus, since the free end of the elastic claw 3026 can move elastically relative to the support leg 40, the installation flexibility of the temperature sensor 3048 is improved, allowing the temperature sensor 3048 to be adjusted within a certain range, and making the installation and disassembly process of the temperature sensor 3048 more convenient.

[0184] Specifically, the free end is the part of the elastic claw 3026 that can be moved by applying external force. The fixed end can be fixedly connected to other parts of the mounting base 50. The fixed connection can be achieved by integral molding, welding, riveting, etc.

[0185] Please refer to Figure 17. In some embodiments, a disassembly opening 3029 is formed between the first end 3027 of the elastic claw 3026 and the support bar 42, and the disassembly opening 3029 communicates with the mounting space 51.

[0186] During assembly, the temperature sensor 3048 can be removed from the installation space 51 through the disassembly port 3029. Furthermore, since the first end 3027 of the elastic claw 3026 is a free end, the disassembly process of the temperature sensor 3048 is relatively convenient.

[0187] Please refer to Figure 18. In some embodiments, the first end 3027 of the elastic claw 3026 is provided with a second guide surface 3049, which extends along the side plate 10 toward the disassembly port 3029 and away from the top surface 3019 of the support leg 40.

[0188] Thus, the second guide surface 3049 facilitates operation by the operator. For example, it allows the operator to directly lift the elastic claw 3026 by hand.

[0189] Please refer to Figures 18 and 20. In some embodiments, the mounting base 50 and the support leg 40 are integrally formed from a first material.

[0190] Thus, since both the mounting base 50 and the support leg 40 are integrally molded from the same material, this not only reduces the overall weight of the mounting base 50 and the support leg 40 but also simplifies the manufacturing and assembly process of the entire volute 100. The integrally molded structure of the mounting base 50 and the support leg 40 improves the integrity of the overall structure and reduces the risk of failure due to loosening or damage to the connection parts. The integrally molded mounting base 50 and support leg 40 reduce additional assembly steps, simplify the production process, improve manufacturing efficiency, and reduce production costs. The integrally molded mounting base 50 and support leg 40 reduce potential positional deviations during assembly, ensuring structural accuracy and consistency. By eliminating positional deviations caused by improper assembly, the noise generated by the volute 100 during operation is reduced.

[0191] Specifically, the mounting base 50 and the support leg 40 can be integrally formed by injection molding, 3D printing, or other methods.

[0192] Please refer to Figures 4 and 21. In some embodiments, the volute 100 is provided with an air outlet 24, and the support leg 40 is provided with a cable holder 60. The cable holder 60 is located on the side of the support leg 40 away from the air outlet 24, and the cable holder 60 is provided with a cable slot 61.

[0193] Thus, by installing the cable holder 60 on the support leg 40, it is possible to conveniently manage and secure pipelines related to the HVAC system 2000, such as power cables and signal cables, allowing the pipelines to be secured in the cable holder groove 61, maintaining overall neatness and order. At the same time, because it is located on the side of the support leg 40 away from the air outlet 24, the airflow has less impact on the cable holder 60 and the pipelines, thereby extending the service life of both.

[0194] Specifically, the cable holder 60 can be detachably connected to the support leg 40 via mechanical components such as bolts and screws, or it can be non-detachably connected via welding, riveting, or other methods. There can be one or more cable holders 60. For example, the cable holders 60 can be located on both sides of the volute 100 along its length. Each cable holder 60 can have one or more cable slots 61.

[0195] Please refer to Figure 21. In some embodiments, the cable holder 60 and the support leg 40 are integrally formed from a first material.

[0196] Thus, the cable holder 60 and the support leg 40 are integrally molded, which improves the integrity of the overall structure and reduces the risk of failure due to loosening or damage of the connection part 13. The integrally molded cable holder 60 and support leg 40 reduce additional assembly steps, simplify the production process, improve manufacturing efficiency, and reduce production costs. The integrally molded cable holder 60 and support leg 40 reduce potential positional deviations during assembly, ensuring structural accuracy and consistency. By eliminating positional deviations caused by improper assembly, the noise generated by the volute 100 during operation is reduced. Furthermore, both the cable holder 60 and support leg 40 are made of the same material, which reduces the overall weight of the cable holder 60 and support leg 40.

[0197] Specifically, the cable holder 60 and the support leg 40 can be integrally formed by injection molding, 3D printing, or other methods.

[0198] Please refer to Figure 2. In some embodiments, the volute 100 includes a flange 70 disposed around the two side plates 10 and the surrounding plate 20.

[0199] The volute 100 is divided by flange 70, with one side of flange 70 being the air outlet zone 3005 and the other side being the air intake zone 3006. In the HVAC system 2000, the centrifugal fan 1000 and the indoor heat exchanger 420 can be installed in the first housing 310 and the second housing 410 of the HVAC indoor unit 2100. The first housing 310 and the second housing 410 are separated by a partition 2001, which has an opening for the air outlet zone 3005 to pass through. The flange 70 abuts against the partition 2001. The air intake zone 3006 is located in the first housing 310, and the air outlet zone 3005 is located in the second housing 410. The air blown out of the air outlet zone 3005 flows to the indoor heat exchanger 420 and is blown into the indoor space after heat exchange by the indoor heat exchanger 420, thereby regulating the indoor temperature. The partition 2001 ensures the airflow path and reduces the probability of airflow returning to the first housing 310 from the second housing 410 after exiting the centrifugal fan 1000. Therefore, by providing flanges 70 surrounding the two side plates 10 and the enclosure 20, the flanges 70 can abut against the partition 2001, thereby increasing the contact area between the volute 100 and the partition 2001. This makes the connection between the volute 100 and the partition 2001 more stable and reliable, reduces the gap between the volute 100 and the partition 2001, and thus improves the sealing effect of the centrifugal fan 1000.

[0200] Specifically, flange 70 can be disposed on one side of side plate 10 in a direction away from side plate 10, or on one side of enclosure 20 in a direction away from enclosure 20. Flange 70 can be detachably connected to side plate 10 via mechanical components such as screws and bolts, or can be non-detachably connected via welding, riveting, or other methods. Flange 70 can be detachably connected to enclosure 20 via mechanical components such as screws and bolts, or can be non-detachably connected via welding, riveting, or other methods.

[0201] The baffle 14 of the suction zone 3006 does not extend beyond the flange 70, and the near volute tongue wall 3007 and far volute tongue wall 3008 of the outlet zone 3005 are arranged in a smooth plane, which increases the performance of the centrifugal fan 1000.

[0202] Please refer to Figure 2. In some embodiments, the flange 70 includes a first mating portion 71 and a second mating portion 72, the first mating portion 71 being fixedly connected to the side plate 10, and the second mating portion 72 being detachably connected to the first mating portion 71.

[0203] Thus, part of the structure of flange 70 can be disassembled, which facilitates the installation and disassembly of components such as side plate 10 and enclosure plate 20.

[0204] Specifically, there can be two first mating parts 71 and two second mating parts 72. The two first mating parts 71 can be respectively disposed on the two side plates 10. The first mating parts 71 can be fixedly connected to the side plates 10 by welding, integral molding or other methods. The second mating parts 72 can be detachably connected to the two first mating parts 71 by threaded connection, snap-fit ​​or other methods.

[0205] Please refer to Figure 2. In some embodiments, the first mating part 71 and the side plate 10 are integrally formed.

[0206] Thus, the first mating part 71 and the side plate 10 are integrally formed, which improves the overall integrity between the flange 70 and the side plate 10 and reduces structural weaknesses caused by improper connection. The integrally formed first mating part 71 and the side plate 10 provide a stronger connection, enhance the connection strength between the flange 70 and the volute 100 and the side plate 10, and ensure the stability of the structure. The integrally formed design simplifies the manufacturing process, avoids additional welding or assembly steps, and reduces production costs and time.

[0207] Specifically, the first docking part 71 and the side plate 10 can be integrally formed by injection molding, 3D printing or other methods.

[0208] Please refer to Figures 22 and 23. In some embodiments, the second mating portion 72 abuts against the plane formed by the distal volute tongue wall 3008 and the suction area 3006. Thus, the second mating portion 72 abuts against the plane formed by the distal volute tongue wall 3008 and the suction area 3006, which can limit the plane formed by the distal volute tongue wall 3008 and the suction area 3006, thereby increasing the strength of the plane formed by the distal volute tongue wall 3008 and the suction area 3006 in the width direction of the enclosure 20.

[0209] Please refer to Figure 23. In some embodiments, the outer peripheral surface 3030 of the distal volute tongue wall 3008 transitions with the outer peripheral surface 3031 of the suction area 3006. The second docking portion 72 includes an abutment wall 3032 and a docking wall 3033 connected to the abutment wall 3032. The abutment wall 3032 abuts against the plane formed by the outer peripheral surface 3030 of the distal volute tongue wall 3008 and the outer peripheral surface 3031 of the suction area 3006.

[0210] Thus, the abutting wall 3032 abuts against the plane formed by the outer peripheral surface 3030 of the distal volute tongue wall 3008 and the outer peripheral surface 3031 of the suction area 3006. This can limit the plane formed by the outer peripheral surface 3030 of the distal volute tongue wall 3008 and the outer peripheral surface 3031 of the suction area 3006, thereby increasing the strength of the plane formed by the distal volute tongue wall 3008 and the suction area 3006 in the width direction of the enclosure plate 20.

[0211] Specifically, the docking wall 3033 can be used to dock with the first docking part 71.

[0212] Please refer to Figure 23. In some embodiments, the first mating part 71 is provided with a insertion groove 710, and the end of the second mating part 72 is inserted into the insertion groove 710.

[0213] This design simplifies the assembly process, allowing the second docking part 72 to connect quickly and accurately with the first docking part 71.

[0214] Specifically, each of the two first mating portions 71 may be provided with an insertion slot 710. The two ends of the second mating portion 72 along its length may be inserted into the two insertion slots 710 respectively.

[0215] Please refer to Figures 24, 25, and 26. In some embodiments, one of the groove wall of the insertion slot 710 and the end of the second mating portion 72 is provided with a first locking groove 7100, and the other is provided with a first locking block 720. The first locking block 720 is engaged in the first locking groove 7100 to restrict the movement of the second mating portion 72 away from the enclosure 20.

[0216] Thus, by providing a first slot 7100 and a first locking block 720 between the groove wall of the insertion slot 710 and the end of the second docking part 72, the connection between the second docking part 72 and the first docking part 71 can be significantly strengthened, preventing the second docking part 72 from accidentally falling off or shifting, and ensuring the stability of the connection in various working environments.

[0217] Specifically, there can be one or more first card slots 7100 and first card blocks 720. The first card slots 7100 and first card blocks 720 can be configured in a one-to-one correspondence.

[0218] Please refer to Figures 23 and 26. In some embodiments, one of the groove wall of the insertion slot 710 and the end of the second mating portion 72 is provided with a first elastic cantilever 3034, and the first locking block 720 is configured to be located at the free end of the first elastic cantilever 3034.

[0219] Thus, the first elastic cantilever 3034 has elastic deformation capability, which makes it easier to disassemble the first elastic cantilever 3034 and the first locking block 720. When disassembly is required, only a certain external force needs to be applied to deform the first elastic cantilever 3034, and the first locking block 720 can be removed from the first elastic cantilever 3034, thereby achieving quick disassembly.

[0220] Specifically, the first elastic cantilever 3034 can deform when subjected to external force and can return to its original shape after the external force is removed.

[0221] Please refer to Figure 23. In some embodiments, the insertion slot 710 has an insertion interface 7101 disposed away from the side plate 10, and the second mating part 72 is used to be inserted into the insertion slot 710 through the insertion interface 7101.

[0222] Thus, the arrangement of the insertion interface 7101 away from the side plate 10 allows the second docking part 72 to utilize the area between the two side plates 10, thereby helping to improve the overall space utilization of the volute 100.

[0223] Specifically, each of the two first mating portions 71 may be provided with a plug-in slot 710. The plug-in interfaces 7101 of the two plug-in slots 710 may be arranged opposite to each other. The orientation of the plug-in interfaces 7101 of the two plug-in slots 710 may be opposite.

[0224] Please refer to Figure 23. In some embodiments, the first docking portion 71 is provided with a first limiting portion 711, and the two ends of the second docking portion 72 are provided with second limiting portions 721. The first limiting portion 711 and the second limiting portion 721 are connected to each other to restrict the two side plates 10 from moving away from each other.

[0225] Thus, by cooperating with the limiting parts of the first docking part 71 and the second docking part 72, the movement of the two side plates 10 away from each other can be restricted, thereby enhancing the stability of the side plates 10 and the rigidity of the overall structure.

[0226] Specifically, the first limiting part 711 and the second limiting part 721 may be provided with structures such as threaded holes, snap-fit ​​holes, and protrusions, so that the limiting can be achieved by means of threaded connection, snap-fit, etc.

[0227] In some embodiments, the second limiting part 721 and the first slot 7100 are arranged along the direction f from upstream to downstream of the air outlet area 3005. In this way, the structure of the second limiting part 721 and the first slot 7100 is compact, which can improve the overall space utilization of the volute 100.

[0228] Please refer to Figure 23. In some embodiments, the first limiting portion 711 includes a first limiting piece 7110, and the second limiting portion 721 includes a second limiting piece 7210. The first limiting piece 7110 abuts against the second limiting piece 7210, and the two first limiting pieces 7110 are located between the two second limiting pieces 7210.

[0229] Thus, the use of the limiting plates provides an additional locking mechanism, ensuring a more reliable connection between the first mating part 71 and the second mating part 72, and reducing loosening caused by vibration or external force. Furthermore, the first limiting plate 7110 can utilize the area between the two second limiting plates 7210, thereby helping to improve the overall space utilization of the volute 100. In addition, achieving limiting through limiting plates is relatively simple and easy to manufacture.

[0230] Please refer to Figure 16. In some embodiments, the flange 70 further includes a third mating portion 3035, which is disposed corresponding to the volute tongue 22, and the third mating portion 3035 is detachably connected to the first mating portion 71.

[0231] Thus, part of the structure of flange 70 can be disassembled, which facilitates the installation and disassembly of components such as side plate 10 and enclosure plate 20.

[0232] Specifically, the third docking part 3035 and the first docking part 71 can be detachably connected by means of threaded connection, snap-fit, etc.

[0233] Please refer to Figures 16, 27, and 28. In some embodiments, one of the ends of the first docking portion 71 and the third docking portion 3035 is provided with a second slot 3036, and the other is provided with a second locking block 3037. The second locking block 3037 is engaged in the second slot 3036 to restrict the third docking portion 3035 from moving away from the volute tongue 22.

[0234] Thus, by providing a second slot 3036 and a second block 3037 in the ends of the first docking part 71 and the third docking part 3035, the connection between the first docking part 71 and the third docking part 3035 can be significantly strengthened, preventing the third docking part 3035 from accidentally falling off or shifting, and ensuring the stability of the connection in various working environments.

[0235] Specifically, there can be one or more second card slots 3036 and second card blocks 3037. The second card slots 3036 and second card blocks 3037 can be configured in a one-to-one correspondence.

[0236] Please refer to Figure 27. In some embodiments, one of the ends of the first docking portion 71 and the third docking portion 3035 is provided with a second elastic cantilever 3038, and the second locking block 3037 is configured to be located at the free end of the second elastic cantilever 3038.

[0237] Thus, the second elastic cantilever 3038 has elastic deformation capability, which makes it easier to disassemble the second elastic cantilever 3038 and the second locking block 3037. When disassembly is required, only a certain external force needs to be applied to deform the second elastic cantilever 3038, and the second locking block 3037 can be removed from the second elastic cantilever 3038, thereby achieving quick disassembly.

[0238] Specifically, the second elastic cantilever 3038 can deform when subjected to external force and can return to its original shape after the external force is removed.

[0239] Please refer to Figures 16 and 29. In some embodiments, the first docking portion 71 is provided with a third limiting portion 3039, and both ends of the third docking portion 3035 are provided with fourth limiting portions 3040. The third limiting portion 3039 and the fourth limiting portion 3040 are connected to restrict the two side plates 10 from moving away from each other. The fourth limiting portion 3040 and the second slot 3036 are arranged in the direction f from upstream to downstream of the air outlet area 3005.

[0240] Thus, through the cooperation of the third limiting part 3039 and the fourth limiting part 3040, the movement of the two side plates 10 away from each other can be restricted, thereby enhancing the stability of the side plates 10 and the rigidity of the overall structure. Since the fourth limiting part 3040 and the second slot 3036 are arranged along the direction f from upstream to downstream of the air outlet area 3005, the structure of the fourth limiting part 3040 and the second slot 3036 is compact, which can improve the overall space utilization of the volute 100.

[0241] Specifically, the third limiting part 3039 and the fourth limiting part 3040 may be provided with structures such as threaded holes, snap-fit ​​holes, and protrusions, so that the limiting can be achieved through threaded connection, snap-fit, or other means.

[0242] Please refer to Figure 29. In some embodiments, the third limiting portion 3039 includes a third limiting piece 3041, and the fourth limiting portion 3040 includes a fourth limiting piece 3042. The third limiting piece 3041 abuts against the fourth limiting piece 3042, and the two third limiting pieces 3041 are located between the two fourth limiting pieces 3042.

[0243] Thus, the use of the limiting plates provides an additional locking mechanism, ensuring a more reliable connection between the first mating part 71 and the third mating part 3035, and reducing loosening caused by vibration or external force. Furthermore, the third limiting plate 3041 can utilize the area between the two fourth limiting plates 3042, thereby helping to improve the overall space utilization of the volute 100. In addition, achieving limiting via limiting plates is relatively simple and easy to manufacture.

[0244] Please refer to Figures 16 and 27. In some embodiments, the volute tongue 22 is provided with a first convex 3043 protruding away from the volute tongue wall 3008, and the third mating portion 3035 is provided with a first curved surface 3044 abutting against the first convex 3043.

[0245] Thus, by setting the first convex hull 3043 and the first curved surface 3044, the connection between the volute tongue 22 and the third docking part 3035 is closer, thereby reducing the noise generated during operation due to the relative movement between the volute tongue 22 and the third docking part 3035.

[0246] Please refer to Figures 16 and 27. In some embodiments, the volute tongue 22 is provided with a second protrusion 3045 protruding away from the volute tongue wall 3008. The second protrusion 3045 is located between the side plate 10 and the first protrusion 3043. The third mating portion 3035 is provided with a second curved surface 3046 that abuts against the second protrusion 3045.

[0247] Thus, by setting the second convex hull 3045 and the second curved surface 3046, the connection between the distal volute tongue wall 3008 and the third docking part 3035 is closer, thereby reducing the noise generated during operation due to the relative movement between the distal volute tongue wall 3008 and the third docking part 3035.

[0248] Please refer to Figure 27. In some embodiments, the third mating portion 3035 is provided with a groove 3047 located near the second curved surface 3046. Thus, the groove 3047 reduces shrinkage of the third mating portion 3035 during injection molding, thereby improving the accuracy of the second curved surface 3046. This reduces the gap between the second curved surface 3046 and the second convex bulge 3045, resulting in a tighter connection between the distal volute tongue wall 3008 and the third mating portion 3035. Consequently, noise generated during operation due to the relative movement of the distal volute tongue wall 3008 and the third mating portion 3035 is reduced.

[0249] Thirdly, please refer to Figure 1. An embodiment of the present invention provides a heating and ventilation indoor unit 2100, which includes the centrifugal fan 1000 of any of the above embodiments.

[0250] In this way, the centrifugal fan 1000 accelerates the airflow, which helps the air to circulate and improves the heat exchange effect.

[0251] Specifically, by varying the thickness of the blades 202 in the impeller 200 according to a specific trend, the profile of the blades 202 is optimized, thereby reducing eddies and high-low pressure differences, improving fan efficiency, and mitigating noise issues. A reinforcing frame is provided at the end of the blade 202 furthest from the impeller 201. This reinforcing frame, through its protrusions, forms a groove with the base ring, thereby increasing structural strength, preventing shrinkage risks, blocking reverse airflow, reducing noise, and improving wind pressure performance.

[0252] Please refer to Figures 1 and 30. In some embodiments, the HVAC indoor unit 2100 includes a first unit 300 and a second unit 400. The first unit 300 includes a first housing 310 and a centrifugal fan 1000 disposed within the first housing 310. The second unit 400 includes a second housing 410 and an indoor heat exchanger 420 disposed within the second housing 410. The first housing 310 and the second housing 410 are detachably connected.

[0253] In this way, by cooperating with the centrifugal fan 1000 and the indoor heat exchanger 420 in the detachably connected first machine 300 and second machine 400, the air circulation and heat exchange are accelerated, thereby improving the efficiency of the HVAC indoor unit 2100.

[0254] Specifically, the first housing 310 can be detachably connected to the second housing 410 via at least one of the following methods: fastener connection, snap-fit ​​connection, screw connection, riveting, adhesive connection, etc. The first housing 310 and the second housing 410 can be arranged side-by-side along the width or length direction of the HVAC indoor unit 2100. For example, both the first housing 310 and the second housing 410 are square housings, arranged side-by-side along the width direction. One side wall of the first housing 310 and the second housing 410 faces each other in the width direction, and can be fitted together or separated by a small gap 15. The centrifugal fan 1000 and the indoor heat exchanger 420 can be separated by the opposing walls of the first housing 310 and the second housing 410.

[0255] Fourthly, please refer to Figure 31. This application provides a heating and ventilation system 2000, which includes an indoor unit 2100 and an outdoor unit 2200 of any of the above embodiments. The outdoor unit 2200 and the indoor unit 2100 are connected by a pipe 2300.

[0256] In this way, the centrifugal fan 1000 accelerates air circulation in the HVAC indoor unit 2100, thereby improving the heat exchange effect of the HVAC system 2000 on the indoor and outdoor environments.

[0257] Specifically, the HVAC outdoor unit 2200 includes a compressor 500, a flow path switching device 600, an outdoor heat exchanger 700, and an expansion valve 800. The compressor 500 compresses and ejects the drawn-in refrigerant. The flow path switching device 600, for example a four-way valve, is a device for switching the direction of the refrigerant flow path.

[0258] The outdoor heat exchanger 700 facilitates heat exchange between the refrigerant and the outdoor air. During heating operation, the outdoor heat exchanger 700 functions as an evaporator, exchanging heat between the low-pressure refrigerant flowing in from the refrigerant piping and the outdoor air, causing the refrigerant to evaporate and vaporize.

[0259] The outdoor heat exchanger 700 acts as a condenser during cooling operation, exchanging heat between the refrigerant, which has been compressed by the compressor 500 and flows in from the flow path switching device 600 side, and the outdoor air, causing the refrigerant to condense and liquefy.

[0260] A centrifugal fan 1000 may also be installed in the outdoor heat exchanger 700 to improve the efficiency of heat exchange between the refrigerant and the outdoor air. The expansion valve 800 is a throttling device that functions as an expansion valve by regulating the flow rate of the refrigerant flowing in the expansion valve 800, and adjusts the refrigerant pressure by changing its opening degree.

[0261] In one example, when the HVAC system 2000 is cooling, the high-temperature, high-pressure gaseous refrigerant compressed and ejected by the compressor 500 flows into the outdoor heat exchanger 700 via the flow path switching device 600. After flowing into the outdoor heat exchanger 700, the gaseous refrigerant condenses into a low-temperature refrigerant through heat exchange with the outside air supplied by the outdoor fan, and flows out of the outdoor heat exchanger 700.

[0262] The refrigerant flowing out of the outdoor heat exchanger 700 expands and depressurizes through the expansion valve 800, becoming a low-temperature, low-pressure gas-liquid two-phase refrigerant. This gas-liquid two-phase refrigerant flows into the indoor heat exchanger 420 of the HVAC indoor unit 2100, where it evaporates through heat exchange with the indoor air supplied by the indoor fan, becoming a low-temperature, low-pressure gaseous refrigerant that flows out of the indoor heat exchanger 420.

[0263] At this point, the indoor air, cooled by the refrigerant absorbing heat, becomes conditioned air and is blown out from the nozzle of the HVAC indoor unit 2100 into the conditioned space. The gaseous refrigerant flowing out of the indoor heat exchanger 420 is drawn into the compressor 500 via the flow path switching device 600 and compressed again. The above actions are repeated.

[0264] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the 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.

[0265] Although embodiments of the 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 invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A volute, characterized in that, include: The surrounding panel extends circumferentially to form a volute-shaped profile. Two side panels are arranged opposite each other and are respectively connected to both sides of the enclosure panel, and at least one of the side panels is provided with an air inlet; In this embodiment, at least one of the side panels is detachably connected to the enclosure panel, the at least one of the side panels is made of a first material, the enclosure panel is made of a second material, and the density of the first material is less than the density of the second material.

2. The volute according to claim 1, characterized in that, The first material is plastic, and the second material is metal.

3. The volute according to claim 2, characterized in that, Each of the side plates has a base plate configured as the outer side of the volute, and the side plate made of the first material has a connecting portion that extends from the base plate toward the other side plate and is detachably attached to the edge of the enclosure.

4. The volute according to claim 3, characterized in that, The connecting part extends circumferentially along the volute-shaped line, and the connecting part has a plurality of fastening parts, which are spaced apart along the circumferential extension trajectory. The plurality of fastening parts are detachably connected to the edge of the enclosure.

5. The volute according to claim 4, characterized in that, The side panel made of the first material has a retaining edge opposite to the connecting part, and a gap is formed between the retaining edge and the connecting part, with the edge of the panel inserted into the gap.

6. The volute according to claim 5, characterized in that, The edge is provided with a support protrusion, which is located in the gap and abuts against the edge of the enclosure.

7. The volute according to any one of claims 4 to 6, characterized in that, The fastening part is constructed as a boss, which protrudes from the side of the connecting part away from the surrounding plate. A mounting hole is provided through the top surface of the boss away from the surrounding plate. The mounting hole is opposite to the adapter hole on the edge side of the surrounding plate for fasteners to pass through and fix.

8. The volute according to claim 7, characterized in that, The boss is configured as a plane away from the top surface of the enclosure, and the top surface abuts against the head surface of the fastener.

9. The volute according to claim 3, characterized in that, The volute profile is configured as an air outlet area, an air intake area, and a volute tongue located between the air outlet area and the air intake area. The air outlet area includes a near volute tongue wall and a far volute tongue wall arranged opposite to each other. The near volute tongue wall is connected to the air intake area via the volute tongue. The airflow flows through the air inlet, through the air intake area, to the air outlet area, and out of the volute from the air outlet area. The connecting portion includes a first connecting portion, a second connecting portion, and a third connecting portion. The first connecting portion extends along the profile of the distal volute tongue wall and is detachably overlapped and fixed to the distal volute tongue wall. The second connecting portion extends along the profile of the proximal volute tongue wall and is detachably overlapped and fixed to the proximal volute tongue wall. The third connecting portion extends along the profile of the suction zone and is detachably overlapped and fixed to the plate wall of the suction zone.

10. The volute according to claim 9, characterized in that, The side panel made of the first material has a retaining edge that extends from the substrate toward the other side panel. The retaining edge is located within the air intake area and is disposed opposite to the third connecting portion to form a gap. The edge portion of the enclosure is inserted into the gap.

11. The volute according to claim 10, characterized in that, The surfaces of the first connecting part and the second connecting part facing the enclosure are defined as inner surfaces. The inner surface of the first connecting part is provided with a first overlapping groove, and the distal volute tongue wall overlaps in the first overlapping groove. The inner surface of the second connecting part is provided with a second overlapping groove, and the proximal volute tongue wall overlaps in the second overlapping groove.

12. The volute according to claim 11, characterized in that, The inner surface of the first connecting part is flush with the proximal cochlear tongue wall, and the inner surface of the second connecting part is flush with the distal cochlear tongue wall.

13. The volute according to claim 12, characterized in that, Each of the substrates includes a first substrate and a second substrate. The two first substrates cover both sides of the air intake area, and the two second substrates cover both sides of the air outlet area. The two first substrates are parallel to each other, and the two second substrates extend obliquely away from each other in a direction from upstream to downstream of the air outlet area. The second substrate made of the first material has a first connecting portion and a second connecting portion. The width of the first connecting portion and the second connecting portion gradually increases from the upstream to the downstream direction of the air outlet area. The first overlapping groove, the second overlapping groove, and the third connecting portion are all of equal width.

14. The volute according to claim 9, characterized in that, The connecting portion further includes a fourth connecting portion, which connects the second connecting portion and the third connecting portion, extends along the profile of the volute tongue, and supports the volute tongue.

15. The volute according to claim 1, characterized in that, Each of the side panels has a base plate configured to form the shape of the volute, the at least one of the side panels is made of plastic, the enclosure is made of metal, the space between the two base plates is defined as the inner side, and the side panel made of the first material has a guide ring extending integrally inward from the base plate, the guide ring forming the air inlet.

16. The volute according to claim 15, characterized in that, Both side panels are made of one-piece plastic molding. Each side panel is detachably connected to the enclosure. Each side panel has the air guide ring. The air guide rings of the two side panels extend toward each other. The two air inlets formed by the two side panels are coaxially arranged.

17. The volute according to claim 16, characterized in that, The two side plates are constructed to be mirror symmetrical.

18. The volute according to any one of claims 1 to 15, characterized in that, One of the two side panels is made of plastic, and the other side panel and the enclosure are made of metal, wherein the side panel made of the first material forms the air inlet, and the side panel made of metal is equipped with a drive motor.

19. A centrifugal fan, characterized in that, include: impeller; and The volute according to any one of claims 1-18, wherein the impeller is housed within the volute.

20. A heating, ventilation, and air conditioning indoor unit, characterized in that, include: The centrifugal fan as described in claim 19.

21. The HVAC indoor unit according to claim 20, characterized in that, The HVAC indoor unit includes a first machine and a second machine. The first machine includes a first housing and a centrifugal fan, with the centrifugal fan disposed within the first housing. The second machine includes a second housing and an indoor heat exchanger, with the indoor heat exchanger disposed within the second housing. The first housing and the second housing are detachably connected.

22. A heating, ventilation, and air conditioning system, characterized in that, include: The HVAC indoor unit as described in claim 20 or 21; and The outdoor unit of the heating and ventilation system is connected to the indoor unit of the heating and ventilation system via pipes.

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