Volute, centrifugal fan, heating and ventilation indoor unit and heating and ventilation system

Abstract

The utility model discloses a volute, a centrifugal fan, a heating and ventilation indoor unit and a heating and ventilation system. The volute comprises a surrounding plate and two side plates which are oppositely arranged. The surrounding plate extends in the circumferential direction to form a volute molded line. The two opposite side plates are connected to the two sides of the coaming correspondingly, and at least one side plate is provided with an air inlet; wherein at least one side plate is detachably connected with the surrounding plate. According to the volute, at least one side plate is detachably connected with the surrounding plate, so that the volute can be formed by independently forming a plurality of parts and assembling the parts, and compared with an integrally formed volute, the manufacturing cost is lower.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning technical field especially relates to a volute, centrifugal fan, heating ventilation indoor unit and heating ventilation system. BACKGROUND

[0002] The centrifugal fan of the heating ventilation indoor unit usually comprises a volute, an impeller and a motor and the like. The volute functions to guide airflow and improve the efficiency of the fan. In the related art, the manufacturing cost of the volute is high, which is not conducive to the cost of the low-cost heating ventilation indoor unit. SUMMARY

[0003] The utility model provides a volute, centrifugal fan, heating ventilation indoor unit and heating ventilation system to solve at least one technical problem existing above.

[0004] A volute comprises:

[0005] a coaming extending circumferentially to form a volute profile,

[0006] two oppositely arranged side plates connected to the two sides of the coaming respectively, at least one of the side plates being provided with an air inlet;

[0007] wherein at least one of the side plates is detachably connected to the coaming.

[0008] In the above volute, at least one of the side plates is detachably connected to the coaming, so that the volute can be formed by separately molding a plurality of components and assembling them. Compared with the integrally formed volute, the manufacturing cost is lower.

[0009] In some embodiments, each of the side plates has a base plate configured to the outer profile of the volute, and the side plate has a connecting portion extending from the base plate towards the other side plate and detachably lapping the edge portion of the coaming.

[0010] In some embodiments, the connecting portion extends circumferentially along the volute profile, and the connecting portion has a plurality of fastening portions arranged at intervals along the circumferential extension track and detachably connected to the edge portion of the coaming.

[0011] In some embodiments, the side plate is provided with a stop edge opposite to the connecting portion, and a gap is formed between the stop edge and the connecting portion, and the edge portion of the coaming is inserted into the gap.

[0012] In some embodiments, the stop edge is provided with a support protrusion located in the gap, and the support protrusion abuts against the edge portion of the coaming.

[0013] In some embodiments, the fastening portion is configured as a boss protruding from a side of the connecting portion facing away from the enclosure, a mounting hole is formed in a top surface of the boss facing away from the enclosure, the mounting hole is opposite to the fitting hole of the edge side of the enclosure, and the fastener is inserted through the mounting hole and the fitting hole to be fixed.

[0014] In some embodiments, the top surface of the boss facing away from the enclosure is configured as a flat surface, and the flat surface is in surface contact with the head of the fastener.

[0015] In some embodiments, the volute profile is configured as an air outlet area, an air inlet area, and a volute tongue between the air outlet area and the air inlet area, the air outlet area includes oppositely arranged proximal volute tongue walls and distal volute tongue walls, the proximal volute tongue walls are connected to the air inlet area through the volute tongue, and air flows from the air inlet area to the air outlet area through the air inlet area and the air outlet area, and then flows out of the volute.

[0016] In some embodiments, 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 lapped and fixed with the distal volute tongue wall, the second connecting portion extends along the profile of the proximal volute tongue wall and is detachably lapped and fixed with the proximal volute tongue wall, and the third connecting portion extends along the profile of the air inlet area and is detachably lapped and fixed with the plate wall of the air inlet area.

[0017] In some embodiments, at least one of the side plates has a stop edge extending from the base plate toward the other side plate, the stop edge is located in the air inlet area and is oppositely arranged with the second connecting portion to form a gap, and the edge portion of the enclosure is inserted into the gap.

[0018] In some embodiments, the surface of the first connecting portion and the third connecting portion facing the enclosure is an inner surface, the inner surface of the first connecting portion is recessed with a first lapping groove, the distal volute tongue wall is lapped in the lapping groove, and the inner surface of the third connecting portion is recessed with a second lapping groove, and the proximal volute tongue wall is lapped in the second lapping groove.

[0019] In some embodiments, the inner surface of the first connecting portion is flush with the proximal volute tongue wall, and the inner surface of the second connecting portion is flush with the distal volute tongue wall.

[0020] In some embodiments, each of the base plates includes a first base plate and a second base plate, two first base plates cover two sides of the air inlet area, and two second base plates cover two sides of the air outlet area, the two first base plates are parallel to each other, and the two second base plates extend away from each other in a direction from upstream to downstream of the air outlet area.

[0021] The second base plate has the first connecting part and the second connecting part, the width of the first connecting part and the second connecting part gradually increases from the upstream to the downstream of the air outlet area, and the first lap joint groove, the second lap joint groove and the third connecting part are arranged with the same width.

[0022] In some embodiments, the connecting part further comprises a fourth connecting part connected between the second connecting part and the third connecting part, extending along the profile of the volute tongue and supporting the volute tongue.

[0023] In some embodiments, 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 being less than the density of the second material.

[0024] In some embodiments, the first material is plastic, and the second material is metal.

[0025] In some embodiments, each side plate has a base plate configured as the outer profile of the volute, the at least one side plate is made of plastic, the surrounding plate is made of metal, the space between the two base plates is defined as the inner side, the side plate made of the first material has a flow guide ring integrally extending inward from the base plate, and the flow guide ring forms the air inlet.

[0026] In some embodiments, the two side plates are integrally made of plastic, each side plate is detachably connected to the surrounding plate, each side plate has the flow guide ring, the flow guide rings of the two side plates extend towards each other, and the two air inlets formed by the two side plates are coaxially arranged.

[0027] In some embodiments, the two side plates are configured to be mirror-symmetric.

[0028] In some embodiments, one of the two side plates is made of plastic, and the other side plate and the surrounding plate are made of metal, wherein the side plate made of plastic forms the air inlet, and the side plate made of metal is provided with a driving motor.

[0029] The centrifugal fan in the embodiment of the present application comprises an impeller and the volute in any one of the above embodiments, and the impeller is accommodated in the volute.

[0030] The heating and ventilation indoor unit comprises the centrifugal fan in any one of the above embodiments.

[0031] In some embodiments, the heating and ventilation indoor unit comprises a first machine and a second machine, the first machine comprises a first cabinet and the centrifugal fan, the centrifugal fan is arranged in the first cabinet, the second machine comprises a second cabinet and an indoor heat exchanger, the indoor heat exchanger is arranged in the second cabinet, and the first cabinet is detachably connected with the second cabinet.

[0032] The heating and ventilation system of the embodiment comprises the heating and ventilation indoor unit and the heating and ventilation outdoor unit of the above embodiment, and the heating and ventilation outdoor unit is connected with the heating and ventilation indoor unit through a pipeline.

[0033] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

[0035] Figure 1 is a structural schematic view of the heating and ventilation air conditioner indoor unit of the embodiment of the present application;

[0036] Figure 2 is a structural schematic view of the centrifugal fan of the embodiment of the present application;

[0037] Figure 3 is a structural schematic view of the fence and the third butt joint of the embodiment of the present application;

[0038] Figure 4 is a partial structural schematic view of the centrifugal fan of the embodiment of the present application;

[0039] Figure 5 is still another partial structural schematic view of the centrifugal fan of the embodiment of the present application;

[0040] Figure 6 is a partial enlarged view of the centrifugal fan of Figure 5 ;

[0041] Figure 7 is a partial enlarged view of the centrifugal fan of Figure 4 ;

[0042] Figure 8 is a sectional view of the centrifugal fan of Figure 5 in the A-A direction;

[0043] Figure 9 is a partial enlarged view of the centrifugal fan of Figure 8 ;

[0044] Figure 10 yes Figure 5 A cross-sectional view of the centrifugal fan along the BB direction;

[0045] Figure 11 yes Figure 10 Enlarged view of section C of the centrifugal fan;

[0046] Figure 12 yes Figure 5 A cross-sectional view of the centrifugal fan along the CC direction;

[0047] Figure 13 yes Figure 2 Enlarged view of the h-section of the centrifugal fan;

[0048] Figure 14 yes Figure 2 Enlarged view of part j of the centrifugal fan;

[0049] Figure 15 This is another structural schematic diagram of the centrifugal fan according to an embodiment of the present utility model;

[0050] Figure 16 This is a partial structural schematic diagram of the centrifugal fan according to an embodiment of the present utility model;

[0051] Figure 17 yes Figure 4 Enlarged view of part e of the centrifugal fan;

[0052] Figure 18 This is a partial structural schematic diagram of the side plate according to an embodiment of the present utility model;

[0053] Figure 19 This is a schematic diagram of the side plate according to an embodiment of the present utility model;

[0054] Figure 20 yes Figure 19 Enlarged view of section k of the side panel;

[0055] Figure 21 yes Figure 4 Enlarged view of part f of the centrifugal fan;

[0056] Figure 22 This is a partial structural schematic diagram of the centrifugal fan according to an embodiment of the present utility model;

[0057] Figure 23 yes Figure 22 Enlarged view of part g of the centrifugal fan;

[0058] Figure 24 This is another structural schematic diagram of the side plate according to an embodiment of the present utility model;

[0059] Figure 25 yes Figure 24is an enlarged view of the m part of the side plate of

[0060] Figure 26 is a structure schematic view of a second docking portion of the embodiment of the present application;

[0061] Figure 27 is a structure schematic view of a third docking portion of the embodiment of the present application;

[0062] Figure 28 is Figure 24 is an enlarged view of the n part of the side plate of

[0063] Figure 29 is Figure 16 is an enlarged view of the p part of the centrifugal fan of

[0064] Figure 30 is still another structure schematic view of the air conditioning indoor unit of the embodiment of the present application;

[0065] Figure 31 is a structure schematic view of the heating and ventilation system of the embodiment of the present application.

[0066] BRIEF DESCRIPTION OF THE DRAWINGS

[0067] HV system 2000; HV indoor unit 2100; first machine 300; first casing 310; second machine 400; second casing 410; indoor heat exchanger 420; HV outdoor unit 2200; pipe 2300; compressor 500; flow path switching device 600; outdoor heat exchanger 700; expansion valve 800; volute 100; side plate 10; surrounding plate 20; volute profile 3001; fastening part 3002; mounting hole 3003; fitting hole 3004; air outlet area 3005; air inlet area 3006; near-volute-tongue wall 3007; far-volute-tongue wall 3008; first connecting part 3009; second connecting part 3010; third connecting part 3011; inner surface of first connecting part 3012; first lapping groove 3013; inner surface of second connecting part 3014; second lapping groove 3015; first base plate 3016; second base plate 3017; fourth connecting part 3018; top surface of leg 3019; convex strip 3020; first guide surface 3021; support surface 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; dismounting opening 3029; outer circumferential surface of far-volute-tongue wall 3030; outer circumferential surface of air inlet area 3031; abutting wall 3032; butting wall 3033; first elastic cantilever 3034; third butting part 3035; second clamping groove 3036; second clamping block 3037; second elastic cantilever 3038; third limiting part 3039; fourth limiting part 3040; third limiting sheet 3041; fourth limiting sheet 3042; first convex bump 3043; first curved surface 3044; second convex bump 3045; second curved surface 3046; profile groove 3047; temperature-sensing bag 3048; second guide surface 3049; air inlet 11; flow guide ring 30; base plate 12; connecting part 13; top surface of surrounding plate 21; boss 130; mounting surface 1300; blocking edge 14; gap 15; support protrusion 16; support surface 160; guide surface 161; volute tongue 22; air outlet 24; recessed part 25; sink 26; leg 40; mounting seat 50; mounting space 51; through hole 41; support strip 42; wire clamping seat 60; wire clamping groove 61; flange 70; first butting part 71; second butting part 72; plug-in groove 710; first clamping groove 7100; first clamping block 720; plug-in opening 7101; first limiting part 711; second limiting part 721; first limiting sheet 7110; second limiting sheet 7210; centrifugal fan 1000; impeller 200; wheel disc 201; blade 202; partition 2001. DETAILED DESCRIPTION

[0068] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are merely intended to explain the present application, and are not to be understood as limiting the present application.

[0069] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0070] In the description of the present application, it should be noted that, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In the present application, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical direction of the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0072] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. For the sake of simplicity, the description below of a particular embodiment or example does not necessarily include all the features that are equivalent to those described. Of course, this is merely an example, and it is not intended to limit the present application. Moreover, the present application can repeatedly refer to reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not indicate a relationship between the various embodiments and / or arrangements being discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials.

[0073] Referring to Figure 1 The heating and ventilation indoor unit 2100 of the present embodiment includes the centrifugal fan 1000 of the above-described embodiment. The heating and ventilation indoor unit 2100 is a device for adjusting the temperature of air. One heating and ventilation indoor unit 2100 can include one or more centrifugal fans 1000. As an example, one heating and ventilation indoor unit 2100 can include two centrifugal fans 1000. The two centrifugal fans 1000 can be spaced apart along the length direction of the heating and ventilation indoor unit 2100.

[0074] Referring to Figure 1 and Figure 2 The centrifugal fan 1000 of the present embodiment includes the volute 100 and the impeller 200. The impeller 200 is housed in the volute 100. In this way, the impeller 200 generates airflow by rotating, sucks air or other gas into the volute 100, and discharges the air or other gas from the volute 100 after being accelerated by the impeller 200.

[0075] Specifically, the impeller 200 is a rotating component in the heating and ventilation indoor unit 2100. The rotation of the impeller 200 can be driven by a driving motor. The volute 100 can be used to guide airflow and improve the efficiency of gas flow. In the heating and ventilation indoor unit 2100, the volute 100 can be a housing part of the centrifugal fan 1000.

[0076] Referring to Figure 2 In some embodiments, the impeller 200 includes a disc 201 and a plurality of blades 202 arranged on the disc 201 in a circumferential direction of the disc 201. In this way, the impeller 200 is composed of the disc 201 and the plurality of blades 202 arranged on the disc 201 in the circumferential direction of the disc 201, which helps to more effectively generate and accelerate airflow, improving the airflow efficiency of the centrifugal fan 1000. The blades 202 and the disc 201 can be integrally formed, or can be separately manufactured and then assembled by welding, threaded connection, etc.

[0077] Referring to Figure 2 , Figure 3 and Figure 4The volute 100 of the embodiment of the present application comprises a baffle 20 and two oppositely arranged side plates 10. The baffle 20 extends circumferentially to form a volute curve 3001. The two oppositely arranged side plates 10 are respectively connected to the two sides of the baffle 20, and at least one side plate 10 is provided with an air inlet 11. At least one side plate 10 is detachably connected with the baffle 20, at least one side plate 10 is made of a first material, and the baffle 20 is made of a second material. The density of the first material is less than the density of the second material.

[0078] In the volute 100 of the embodiment of the present application, when the side plate 10 and the baffle 20 are both made of a material with high density, the weight of the volute 100 is large, which makes the transportation cost and installation cost of the volute 100 high. When the side plate 10 and the baffle 20 are both made of a material with low density, the weight of the volute 100 is small, but since the material with low density usually has a complex manufacturing process, the manufacturing cost of the volute 100 is high. Therefore, under the same volume, by making at least one side plate 10 of a first material with small density, the volute 100 can have the advantages of light weight and low cost, that is, under the condition of small weight, the transportation cost, installation cost and manufacturing cost of the volute 100 are low. In addition, since the baffle 20 is made of a second material with high density, the overall structural strength of the volute 100 can still meet the demand. By providing the air inlet 11 on the side plate 10, the airflow entering the volute 100 can be more effectively controlled and guided, so that the air flow in the volute 100 can be increased, thereby improving the heat dissipation efficiency.

[0079] In addition, the detachable connection design makes the side plate 10 and the baffle 20 of the volute 100 can be produced in batches in a modular way, and then assembled. This modular production method can improve production efficiency and reduce complexity and cost in the production process. At the same time, the detachable design of the side plate 10 and the baffle 20 also facilitates later maintenance and replacement, improves assembly efficiency, and increases the size adaptability of the volute 100. When the size of the volute 100 needs to be changed, only the width of the baffle 20 needs to be changed, that is, the baffle 20 with different widths is adapted to the same side plate 10. Therefore, the size adaptability of the volute 100 of the present application is improved, and all parts do not need to be re-molded, which reduces production cost and production time.

[0080] Specifically, the side plate 10 can be a flat plate structure constituting the two sides of the volute 100. The side plate 10 can be used to provide support and enclosure. The two side plates 10 can be oppositely arranged along the length direction and the width direction 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 are oppositely arranged along the length direction of the volute 100.

[0081] The surrounding plate 20 can be used to fix and connect two side plates 10. The connection between the surrounding plate 20 and the side plate 10 can be screw connection, snap connection, etc.

[0082] The density refers to the mass per unit volume of a material. The density of the side plate 10 is less than that of the surrounding plate 20, which means that the material used by the side plate 10 is lighter than that of the surrounding plate 20. The first material can be ABS (Acrylonitrile Butadiene Styrene) plastic, polypropylene, or carbon fiber reinforced plastic, etc. The second material can be stainless steel, aluminum plate, or galvanized iron plate, etc.

[0083] The air inlet 11 refers to an opening provided on the side plate 10, which can serve as an entrance for air flow into the interior of the volute 100. The shape of the air inlet 11 can be regular, such as circular, square, etc., or irregular. One air inlet 11 can be provided on the side plate 10. The air inlet 11 can be provided at the middle part 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.

[0084] In some embodiments, the first material is plastic, and the second material is metal.

[0085] Compared with plastic, the density of metal material is higher. When the side plate 10 and the surrounding plate 20 are made of metal material, the weight of the volute 100 is larger, which makes the transportation cost and installation cost of the volute 100 higher. When the side plate 10 and the surrounding plate 20 are made of plastic material, the weight of the volute 100 is smaller, but the manufacturing cost of the volute 100 is higher. Therefore, under the same volume, by making at least one side plate 10 from the first material with smaller density, for example, the side plate 10 is made of plastic material, and the surrounding plate 20 is made of metal material, the weight of the volute 100 is smaller, and the manufacturing cost is relatively lower, and the transportation cost and installation cost of the volute 100 can be reduced. In addition, since the surrounding plate 20 is a metal plate, the overall structural strength of the volute 100 can still meet the requirements.

[0086] Please refer to Figure 2 and Figure 4 In some embodiments, each side plate 10 has a base plate 12 configured in the form of the outer side of the volute 100, and the side plate 10 made of the first material has a connecting portion 13 extending from the base plate 12 towards the direction of the other side plate 10 and detachably lapping the edge portion of the surrounding plate 20. Of course, the side plate 10 can also not be made of the first material, or in other words, both side plates 10 can have the connecting portion 13.

[0087] Thus, the connecting portion 13 is detachably lapped on the edge portion of the shroud 20, which can enhance the connection strength between the side plate 10 and the shroud 20. The structure of the connecting portion 13 provides additional contact area and support, so that the connection is more stable. In addition, the connecting portion 13 can also serve as an assembly reference, so as to facilitate the alignment during the assembly of the side plate 10 and the shroud 20, so as to reduce the gap between the side plate 10 and the shroud 20, thereby reducing the risk of air leakage and reducing noise.

[0088] Specifically, the base plate 12 can be the main part of the side plate 10. The connecting portion 13 can be formed on the edge of the base plate 12 by folding, injection molding, etc.

[0089] Please refer to Figure 2 and Figure 5 In some embodiments, the two side plates 10 are configured to be mirror-symmetric. Thus, it is convenient for the overall processing and forming of the volute 100.

[0090] Please refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 12 In some embodiments, the connecting portion 13 extends along the circumferential direction r of the volute profile 3001, and the connecting portion 13 has a plurality of fastening portions 3002, which are arranged at intervals along the circumferential extension track, and the plurality of fastening portions 3002 are detachably connected with the edge portion of the shroud 20.

[0091] Thus, the fastening portion 3002 can enhance the connection reliability between the side plate 10 and the shroud 20, and can increase the rigidity of the entire volute 100 structure, and reduce the structural deformation caused by vibration or external impact during operation. By arranging a plurality of fastening portions 3002 on the connecting portion 13 and arranging them at intervals along the circumferential direction, the connection stability between the side plate 10 and the shroud 20 can be enhanced. This multi-point connection mode provides more fixing points, so that the entire volute 100 structure is more stable.

[0092] Specifically, the connecting portion 13 can extend integrally and continuously along the circumferential direction of the volute profile 3001. The connecting portion 13 can also extend discontinuously along the circumferential direction of the volute profile 3001. For example, along the circumferential direction of the volute profile 3001, the connecting portion 13 can be divided into three segments, and the two adjacent segments are arranged at intervals.

[0093] The connecting portion 13 and the shroud 20 can be provided with corresponding threaded holes, riveting holes, etc. The fastening portion 3002 is a portion for fixing the side plate 10 and the shroud 20. The fastening portion 3002 can include threaded holes, riveting holes, etc. to cooperate with mechanical elements such as screws, bolts, or rivets to fix the side plate 10 and the shroud 20. For example, the connecting portion 13 and the shroud 20 can be provided with a plurality of corresponding threaded holes, and the side plate 10 and the shroud 20 can be fastened by using bolts to pass through the threaded holes. The fastening portion 3002 can also be a welding area to fix the side plate 10 and the shroud 20 by welding.

[0094] Please refer to Figure 5 , Figure 8 and Figure 9 . In some embodiments, the side plate 10 made of the first material is provided with a stop edge 14 opposite to the connecting portion 13, and a gap 15 is formed between the stop edge 14 and the connecting portion 13, and the edge portion of the shroud 20 is inserted into the gap 15. Of course, the side plate 10 can also not be made of the first material, or in other words, both side plates 10 can be provided with a stop edge 14 opposite to the connecting portion 13.

[0095] In this way, this design provides additional support and fixation for the shroud 20 through the cooperation of the stop edge 14 and the connecting portion 13, and enhances the stability of the entire volute 100 structure. At the same time, the stop edge 14 can also be used to block the airflow to prevent the internal airflow of the volute 100 from leaking out. In addition, the gap 15 formed by the stop edge 14 and the connecting portion 13 can serve as a guide for the insertion of the shroud 20, improving the precision of the assembly of the shroud 20 and the side plate 10, ensuring that the shroud 20 and the side plate 10 are correctly aligned and fixed, reducing assembly errors, thereby being able to reduce the gap between the side plate 10 and the shroud 20, and further being able to reduce the risk of airflow leakage and noise.

[0096] Specifically, the stop edge 14 and the base plate 12 can be integrally formed. For example, the stop edge 14 and the base plate 12 can be formed by injection molding. The stop edge 14 and the base plate 12 can also be manufactured separately and then assembled. For example, the stop edge 14 and the base plate 12 can be machined separately and then assembled by bonding or welding.

[0097] Please refer to Figure 10 and Figure 11 . In some embodiments, the stop edge 14 is provided with a support protrusion 16, the support protrusion 16 is located in the gap 15, and the support protrusion 16 abuts against the edge portion of the shroud 20.

[0098] In this way, the support protrusion 16 provides an additional support point, enhancing the support strength of the volute 100 structure. The presence of the support protrusion 16 makes the connection between the stop edge 14 and the shroud 20 more stable, reducing displacement caused by external forces or vibrations, thereby improving the stability of the entire volute 100 structure.

[0099] Specifically, the support protrusion 16 can be protruded from one side of the retaining edge 14 in a direction towards the enclosure 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 manufactured separately and then assembled by adhesion.

[0100] Please refer to Figure 5 , Figure 8 and Figure 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 base plate 12, and the distance between the guide surface 161 and the connecting portion 13 decreases in the direction e towards the base plate 12.

[0101] In this way, the distance between the guide surface 161 and the connecting portion 13 decreases in the direction e towards the base plate 12, and this design forms a gradual guide structure, which helps to guide the edge of the enclosure 20 to smoothly enter the gap 15, reduces the resistance and alignment difficulty in the assembly process, and makes the edge of the enclosure 20 more smoothly inserted into the gap 15 in the assembly process.

[0102] Specifically, the support surface 160 is used to support the enclosure 20. The guide surface 161 is used to guide the movement of the enclosure 20 to the support surface 160. In the height direction of the volute 100, the support surface 160 can be located above the side of the guide surface 161. In the direction e towards the base plate 12, the distance between the guide surface 161 and the connecting portion 13 decreases from D3 to D4. Wherein, D3 is the distance between the end of the guide surface 161 away from the base plate 12 and the connecting portion 13, and D4 is the distance between the end of the guide surface 161 close to the base plate 12 and the connecting portion 13.

[0103] Please refer to Figure 8 and Figure 9 . In some embodiments, in the thickness direction d of the base plate 12, the size D1 of the connecting portion 13 is greater than the size D2 of the retaining edge 14.

[0104] In this way, since the size D1 of the connecting portion 13 is greater than the size D2 of the retaining edge 14, the enclosure 20 is easy to be inserted into the gap 15 in the assembly process. In addition, the size D2 of the retaining edge 14 is relatively small, so the required material consumption is small, which is conducive to reducing the manufacturing cost.

[0105] Specifically, the thickness direction d of the base plate 12 refers to the vertical distance from one side of the base plate 12 to the other side.

[0106] Please refer to Figure 8 and Figure 9In some embodiments, the distance between the support surface 160 and the connecting portion 13 is uniform.

[0107] In this way, the distance between the support surface 160 and the connecting portion 13 is uniform, which ensures that the support force of the support protrusion 16 on the surrounding plate 20 is uniformly distributed, reduces local stress concentration, and thus improves the durability and reliability of the structure.

[0108] Specifically, the distance between the support surface 160 and the connecting portion 13 refers to the minimum distance between the areas opposite to each other between the support surface 160 and the connecting portion 13.

[0109] Please refer to Figure 4 and Figure 7 In some embodiments, the number of support protrusions 16 is multiple, and the multiple support protrusions 16 are arranged along the circumferential direction r of the volute profile 3001.

[0110] In this way, the multiple support protrusions 16 are arranged along the circumferential direction r of the volute profile 3001, which makes the support force uniformly distributed around the entire volute 100, improving the overall stability and load-carrying capacity of the structure.

[0111] Specifically, the number of support protrusions 16 can be two, three, four, or even more. The extension direction of the retaining edge 14 can be the same as the circumferential direction r of the volute profile 3001.

[0112] Please refer to Figure 3 and Figure 7 In some embodiments, the fastening portion 3002 is configured as a boss 130 protruding from the side of the connecting portion 13 away from the surrounding plate 20, and a mounting hole 3003 is provided in the top surface 21 of the boss 130 away from the surrounding plate 20, the mounting hole 3003 is opposite to the fitting hole 3004 of the edge side of the surrounding plate 20, and the fastener is provided through the mounting hole 3003 for fixation.

[0113] In this way, the boss 130 can play a reinforcing role, so that the fastener can provide stable fastening force to improve the connection stability of the side plate 10 and the surrounding plate 20.

[0114] Specifically, the boss 130 can protrude from one side of the connecting portion 13 away from the surrounding plate 20. The boss 130 can be integrally formed with the connecting portion 13, or can be manufactured separately from the connecting portion 13 and then assembled.

[0115] The number of the bosses 130 can be multiple, and the multiple bosses 130 can be arranged at intervals. One or more mounting holes 3003 can be arranged on each boss 130. The number of the mounting holes 3003 can correspond to the number of the adapting holes 3004 one by one. The center axis of the mounting hole 3003 can be collinear with the center axis of the adapting hole 3004. The mounting hole 3003 can be a threaded hole, a riveting hole, or the like. The fastener can be a screw, a bolt, or a rivet, or the like.

[0116] In some embodiments, the fastener includes a rivet.

[0117] In this way, the use of the rivet enables the overall structure of the surrounding 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 surrounding plate 20. Moreover, the structure of the rivet connection can reduce the relative movement between the side plate 10 and the surrounding plate 20, reducing the noise caused by vibration.

[0118] Please refer to Figure 6 and Figure 7 In some embodiments, the top surface 21 of the boss 130 away from the surrounding plate 20 is configured as a flat surface, and the top surface 21 of the boss 130 away from the surrounding plate 20 is in surface-to-surface abutment with the head of the fastener. The top surface 21 of the boss 130 away from the surrounding plate 20 can be a mounting flat surface 1300.

[0119] During the abutment of the fastener and the curved surface structure, the top surface can be deformed, resulting in functional failure of the fastener after long-term use. Therefore, configuring the top surface 21 of the boss 130 away from the surrounding plate 20 as a flat surface and arranging the top surface in surface-to-surface abutment with the head of the fastener can reduce the possibility of deformation of the top surface, thereby ensuring the functional stability of the fastener, which helps to reduce the possibility of loosening of the fastener, thereby reducing the noise and structural damage caused by vibration.

[0120] Please refer to Figure 2 , Figure 3 and Figure 12 In some embodiments, the volute profile 3001 is configured as an air outlet area 3005, an air inlet area 3006, and a volute tongue 22 located between the air outlet area 3005 and the air inlet area 3006, the air outlet area 3005 includes oppositely arranged proximal volute tongue walls 3007 and distal volute tongue walls 3008, the proximal volute tongue walls 3007 are connected to the air inlet area 3006 through the volute tongue 22, and the air flow flows from the air inlet area 3006 to the air outlet area 3005 through the air inlet 11, and then flows out of the volute 100 from the air outlet area 3005.

[0121] The connecting portion 13 comprises a first connecting portion 3009, a second connecting portion 3010 and a third connecting portion 3011. The first connecting portion 3009 extends along the profile of the distal volute tongue wall 3008 and is detachably fixed to the distal volute tongue wall 3008. The second connecting portion 3010 extends along the profile of the proximal volute tongue wall 3007 and is detachably fixed to the proximal volute tongue wall 3007. The third connecting portion 3011 extends along the profile of the air suction area 3006 and is detachably fixed to the plate wall of the air suction area 3006.

[0122] In this way, the connecting portion 13 is divided into the first connecting portion 3009, the second connecting portion 3010 and the third connecting portion 3011, which respectively extend along the profiles of the distal volute tongue wall 3008, the proximal volute tongue wall 3007 and the air suction area 3006. Such a design makes the connecting portion 13 more conform to the profile of the volute 100, thereby enhancing the stability and integrity of the structure. In addition, each connecting portion 13 is detachably fixed to the corresponding part of the volute 100, which makes the assembly and maintenance of the volute 100 more convenient. Any part can be individually disassembled and replaced without the need to disassemble the entire volute 100. The volute tongue 22 can be used for flow guiding and stabilizing. The volute tongue 22 can serve as a transition section from the air suction area 3006 to the air outlet area 3005, thereby stably transitioning the airflow and reducing turbulence and vortex to improve the overall air outlet efficiency of the volute 100.

[0123] Specifically, the air suction area 3006 can be formed by at least two arc segments and at least one straight line segment. For example, the bottom of the air suction area 3006 can be provided as a straight line segment, which can reduce the overall height of the volute 100, thereby being suitable for some installation scenarios with height restrictions.

[0124] The air outlet area 3005 can be provided as an inclined downward straight line segment. The inclination rate of the proximal volute tongue wall 3007 can be greater than that of the distal volute tongue wall 3008. Because the air outlet volume near the proximal volute tongue wall 3007 is greater than that near the distal volute tongue wall 3008, the inclination rate of the proximal volute tongue wall 3007 being greater than that of the distal volute tongue wall 3008 is conducive to improving the overall air outlet volume of the volute 100.

[0125] The proximal volute tongue wall 3007, the distal volute tongue wall 3008, the first base plate 3016 and the second base plate 3017 together enclose the air outlet 24. The shape of the air outlet 24 can be a regular shape such as a circle or a square, or an irregular shape. During the operation of the centrifugal fan 1000, the airflow can enter the volute 100 through the air inlet 11, then flow in the direction from the air suction area 3006 to the air outlet area 3005 under the action of the impeller 200, and flow out of the volute 100 from the air outlet 24.

[0126] Please refer to Figure 2In some embodiments, the middle part of the volute tongue 22 is provided with a recess 25 recessed away from the distal volute tongue wall 3008 along the axial direction z of the air inlet 11.

[0127] During use, the distribution of the air flow out of the volute 100 is uneven, specifically, the air volume is greater along the axial direction z of the air inlet 11 closer to the middle part of the volute tongue 22, and the air flow speed is faster where the air volume is greater. Therefore, due to the relatively low position of the recess 25, the flow area at the position of the recess 25 can be effectively expanded, thereby reducing the flow speed of the air flow at the recess 25, and making the air flow speed at the position of the recess 25 consistent with the air flow speed at the positions on both sides of the recess 25 on the volute tongue 22, thereby achieving uniform air supply in the outlet 24 area.

[0128] In this way, under the same working sound, more air flow can pass through the outlet 24, so that the volute 100 can meet the air conditioning of a larger space. Correspondingly, under the same air volume, the centrifugal fan 1000 provided with the volute 100 of the embodiment has a lower working sound, thereby improving the use comfort of the centrifugal fan 1000. Correspondingly, under the same air volume and the same working sound, the volute 100 has a smaller volume, thereby meeting lower cost or adapting to more diversified installation space 51 requirements.

[0129] Specifically, the recess 25 can be a groove formed on the volute tongue 22 by stamping or other processes. The recess 25 can include one or more grooves.

[0130] 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 in the air suction area 3006 and is arranged opposite to the third connecting part 3011 to form a gap 15, and the edge portion of the surrounding plate 20 is inserted into the gap 15. Inside the volute 100, turbulent flow of gas is usually formed in the air suction area 3006. Therefore, there are many different directions of gas attack on the edge of the air suction area 3006 inside the volute 100, especially the area close to the third connecting part 3011 of the air suction area 3006. Therefore, there is a risk of leakage at the edge of the air suction area 3006 close to the third connecting part 3011. Therefore, the retaining edge 14 arranged opposite to the third connecting part 3011 in the air suction area 3006 can reduce the risk of gas leakage from the edge of the air suction area 3006.

[0131] During the assembly process, additional support components can be provided on the air outlet area 3005 to facilitate the fixing of the enclosure 20 of the air outlet area 3005. For example, fasteners are used to connect the enclosure 20 and the side plate 10. However, the position of the air inlet area is difficult to be directly observed, which leads to the possibility of improper assembly when fasteners are used to connect the enclosure 20 and the side plate 10. Therefore, the baffle provided on the air suction area 3006 can also provide the functions of support and limiting, thereby facilitating the fixing of the enclosure 20.

[0132] In some embodiments, the side plate 10 made of the first material has the flange 14. The side plate 10 made of the first material with a relatively low density is prone to form gaps under the impact of air flow. Therefore, by providing the flange 14 on the side plate 10 made of the first material, the risk of air flow leakage can be effectively reduced.

[0133] Please refer to Figure 2 , Figure 13 and Figure 14 . In some embodiments, the surface of the first connecting portion 3009 and the second connecting portion 3010 towards the enclosure 20 is defined as an inner surface. The inner surface 3012 of the first connecting portion 3009 is concavely provided with a first lapping groove 3013, and the distal volute tongue wall 3008 is lapped in the first lapping groove 3013. The inner surface 3014 of the second connecting portion 3010 is concavely provided with a second lapping groove 3015, and the proximal volute tongue wall 3007 is lapped in the second lapping groove 3015.

[0134] In this way, during the assembly process, the first lapping groove 3013 can serve as a positioning reference between the first connecting portion 3009 and the distal volute tongue wall 3008, and the second lapping groove 3015 can serve as a positioning reference between the second connecting portion 3010 and the proximal volute tongue wall 3007. The lapping groove is beneficial to reduce the height difference between the top surface 21 of the enclosure 20 and the inner surface 3014 of the first connecting portion 3009 or the second connecting portion 3010, thereby facilitating the air flow through the air outlet area 3005, and thus improving the overall air outlet efficiency of the volute 100.

[0135] Specifically, the first lapping groove 3013 can be formed by injection molding. The second lapping groove 3015 can be formed by injection molding.

[0136] Please refer to Figure 2 , Figure 13 and Figure 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.

[0137] Therefore, by leveling the inner surface 3012 of the first connecting portion 3009 with the proximal volute tongue wall 3007 and leveling the inner surface of the second connecting portion 3010 with the distal volute tongue wall 3008, the air flow through the air outlet area 3005 is facilitated, thereby improving the overall air outlet efficiency of the volute 100.

[0138] Please refer to Figure 4 and Figure 15 In some embodiments, each substrate 12 includes a first substrate 3016 and a second substrate 3017, two first substrates 3016 cover two sides of the air suction area 3006, and two second substrates 3017 cover two sides of the air outlet area 3005, the two first substrates 3016 are parallel to each other, and the two second substrates 3017 extend away from each other in the direction f from upstream to downstream of the air outlet area 3005; the second substrate 3017 made of the 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 air outlet area 3005, and the first lap joint groove 3013, the second lap joint groove 3015, and the third connecting portion 3011 are arranged with the same width. Of course, the second substrate 3017 can also not be made of the first material, or both of the second substrates 3017 can have the first connecting portion 3009 and the second connecting portion 3010.

[0139] Therefore, when the centrifugal fan 1000 is working, the impeller 200 sucks the air from the air inlet 11 into the volute 100 and blows it to the indoor heat exchanger 420 through the air outlet area 3005. Since the two second substrates 3017 extend away from each other, the air passing through the area between the two second substrates 3017 can be diffused during the process of blowing to the indoor heat exchanger 420, thereby converting the dynamic pressure of the air outlet area 3005 into static pressure as much as possible and reducing the air speed at the air outlet area 3005, which is conducive to reducing the operation noise of the heating and ventilation system 2000.

[0140] Moreover, the gradual increase in the widths of the first connecting portion 3009 and the second connecting portion 3010 in the direction f from upstream to downstream of the air outlet area 3005 can increase the area of the air flow directly blowing to the indoor heat exchanger 420, improve the heat exchange effect of the indoor heat exchanger 420, and avoid the concentrated impact of the air flow on the indoor heat exchanger 420, thereby further reducing the operation noise of the heating and ventilation system 2000. Therefore, the centrifugal fan 1000 with the volute 100 according to the embodiments of the present application is conducive to improving the heat exchange effect of the heating and ventilation system 2000 while effectively reducing the operation noise of the heating and ventilation system 2000.

[0141] Because the first lap joint groove 3013, the second lap joint groove 3015, the third connecting part 3011 are provided with different widths, it is beneficial to save material during manufacturing, thereby reducing manufacturing cost. Because the lap joint groove is manufactured according to the maximum size, if not provided with different widths, it may cause waste of material.

[0142] Specifically, in the direction f from upstream to downstream of the air outlet area 3005, the distance between the two second base plates 3017 changes from D5 to D6. Wherein, D5 is the distance between the two ends of the two second base plates 3017 away from the air outlet area 3005, and D6 is the distance between the two ends of the two second base plates 3017 close to the air outlet area 3005.

[0143] Please refer to Figure 16 In some embodiments, the connecting part 13 further comprises a fourth connecting part 3018, which is connected between the second connecting part 3010 and the third connecting part 3011, extends along the contour of the volute tongue 22 and supports the volute tongue 22.

[0144] In this way, the fourth connecting part 3018 can make the position of the volute tongue 22 more stable, thereby being able to reduce noise.

[0145] Specifically, one end of the fourth connecting part 3018 can be connected with the second connecting part 3010. The other end of the fourth connecting part 3018 can be connected with 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 joint points, thereby further reducing noise.

[0146] Please refer to Figure 2 and Figure 4 In some embodiments, each side plate 10 has a base plate 12 configured to the outer shape of the 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 flow guide ring 30 integrally extending inward from the base plate 12, and the flow guide ring 30 forms the air inlet 11.

[0147] In this way, the flow guide ring 30 can smooth and guide the airflow, reduce the turbulence and noise of the airflow when entering the volute 100. The flow guide ring 30 is arranged at the edge of the air inlet 11, which helps to more effectively guide the airflow through the air inlet 11 and reduce the generation of airflow turbulence and vortex.

[0148] Specifically, the flow guide ring 30 can be connected with the side plate 10. The flow guide ring 30 can be protruded from one side of the side plate 10 in a direction towards the impeller 200. The flow guide ring 30 can be arranged around the periphery of the air inlet 11. The shape of the flow guide ring 30 can match the shape of the air inlet 11. For example, for a circular air inlet 11, the shape of the flow guide ring 30 can be a circular ring shape.

[0149] Please refer to Figure 4 In some embodiments, each side plate 10 has a flow guide ring 30, and the flow guide rings 30 of the two side plates 10 extend towards each other, and the two air inlets 11 formed by the two side plates 10 are coaxially arranged.

[0150] In this way, the coaxial arrangement of the two air inlets 11 can allow air to enter uniformly from both sides, reducing air flow deflection and vortex.

[0151] Specifically, the coaxial arrangement means that the centers of the two air inlets 11 are located on the same axis.

[0152] In some embodiments, the two side plates 10 are integrally formed by plastic. In this way, the total weight of the two side plates 10 is relatively light, which can reduce the total weight of the volute 100.

[0153] Please refer to Figure 2 and Figure 4 In some embodiments, the side plate 10 and the flow guide ring 30 are integrally formed.

[0154] In this way, the integrally formed structure eliminates potential seams between the side plate 10 and the flow guide ring 30, thereby reducing the possibility of air leakage and reducing noise and vibration caused by air flow impact. In addition, since there is no seam or connection point between the side plate 10 and the flow guide ring 30, the structural weakness caused by improper connection or long-term use is reduced. In addition, the integrally formed side plate 10 and flow guide ring 30 reduce the additional assembly steps and simplify the manufacturing process.

[0155] Specifically, the side plate 10 and the flow guide ring 30 can be integrally formed by injection molding, 3D printing, etc.

[0156] In some embodiments, one of the two side plates 10 is made of plastic, and the other side plate 10 and the surrounding plate 20 are made of metal. The side plate 10 made of plastic forms the air inlet 11, and the side plate 10 made of metal is installed with the driving motor. In this way, the side plate 10 made of plastic and the side plate 10 made of metal can take into account the advantages of light weight and driving motor installation. The side plate 10 made of plastic can be used to form the air inlet 11 while reducing weight, and the side plate 10 made of metal can improve the installation stability of the driving motor.

[0157] Please refer to Figure 2In some embodiments, along the axial direction z of the air inlet 11, the edge portion of the volute tongue 22 is provided with a recessed groove 26 recessed away from the distal volute tongue wall 3008.

[0158] Thus, during the operation of the centrifugal fan 1000 provided with the volute 100 of the embodiments of the present application, the recessed groove 26 can ensure the minimum gap between the volute tongue 22 and the outer edge of the impeller 200, while reducing the impact of the airflow on the volute tongue 22, optimizing the flow field inside the volute 100, effectively suppressing the vortex flow at the volute tongue 22, while ensuring the performance of the centrifugal fan 1000, effectively reducing the vortex noise of the centrifugal fan 1000, thereby improving the use comfort of the centrifugal fan 1000 and ensuring the air supply efficiency of the centrifugal fan 1000.

[0159] Specifically, the recessed groove 26 can be formed by stamping or other processes. The recessed groove 26 can be located on opposite sides of the volute tongue 22. The number of recessed grooves 26 can be one or more. For example, one recessed groove 26 can be provided on each of the opposite sides of the volute tongue 22.

[0160] Please refer to Figure 2 , Figure 4 and Figure 17 . In some embodiments, the volute 100 further comprises a foot 40, and the foot 40 and the side plate 10 are integrally formed by the first material.

[0161] Thus, since the foot 40 and the side plate 10 are integrally formed by the first material, not only the overall weight of the foot 40 and the side plate 10 is reduced, but also the manufacturing and assembly process of the entire volute 100 is simplified, and the manufacturing cost of the volute 100 is reduced. The integrally formed side plate 10 and foot 40 reduce the positional deviation that may occur during assembly, ensuring the accuracy and consistency of the structure. Since the positional deviation caused by improper assembly is eliminated, the noise generated by the volute 100 during operation is reduced. In addition, since there is no joint or connection point between the foot 40 and the side plate 10, the structural weakness caused by improper connection or long-term use is reduced.

[0162] In addition, the foot 40 can 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 force. In addition, the addition of the foot 40 allows the volute 100 to adapt to uneven installation surfaces, providing more installation options, so that the volute 100 can be more easily installed on various different surfaces.

[0163] 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.

[0164] Please refer to Figure 17 and Figure 18 In some embodiments, the support leg 40 is provided with a mounting base 50 for mounting the temperature sensor 3048.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] Please refer to Figure 18 , Figure 19 and Figure 20 In some embodiments, the mounting base 50 is formed with a mounting space 51 for accommodating the temperature sensing bulb 3048.

[0169] 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.

[0170] Please refer to Figure 18 , Figure 19 and Figure 20In some embodiments, the mounting base 50 is formed with a plurality of through holes 41, and between any two adjacent through holes 41, a support strip 42 is provided on one side of the top surface 3019 of the leg 40, and the support strip 42 is located at the bottom of the mounting space 51.

[0171] In this way, the plurality of through holes 41 on the leg 40 are designed for ventilation, which enhances the heat dissipation performance of the region and effectively avoids heat accumulation, which helps to ensure that the temperature data measured by the temperature sensing bag 3048 is not disturbed by the heat accumulation of the surrounding environment, and improves the reliability of temperature measurement. The provision of the support strip 42 can reduce the area of the mounting base 50 in contact with the temperature sensing bag 3048, increase the ventilation space around the temperature sensing bag 3048, and facilitate heat dissipation of the temperature sensing bag 3048, thereby further improving the accuracy of temperature measurement.

[0172] In addition, the design of the through hole 41 reduces the amount of material used in the leg 40, achieves weight reduction, and helps to reduce material costs, thereby directly reducing manufacturing costs. The design of the through hole 41 facilitates the flow of liquid during injection molding, reduces shrinkage during injection molding, and improves the molding quality and production efficiency of the leg 40.

[0173] 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. The support strip 42 can be arranged in the spacing region between the two adjacent through holes 41. The support strip 42 can be provided on one side of the leg 40 in a direction away from the leg 40. The support strip 42 can be integrally formed with the leg 40. The support strip 42 can also be manufactured separately from the leg 40 and then assembled.

[0174] Please refer to Figure 20 . The number of support strips 42 is multiple, and the multiple support strips 42 are arranged at intervals. Along the arrangement direction of the multiple support strips 42, the support strip 42 located in the middle of the multiple support strips 42 is provided with a protruding strip 3020 extending away from the mounting space 51.

[0175] In this way, the protruding strip 3020 can support the strength of the support strip 42. The center of gravity of the support is generally concentrated in the middle position, so the way of arranging the protruding strip 3020 on the support strip 42 in the middle of the multiple support strips 42 can increase the stability of the support strip 42 when supporting.

[0176] Please refer to Figure 20 . In some embodiments, the support strip 42 includes a first guide surface 3021 and a support surface 3022, the support surface 3022 faces the mounting space 51 and is used for mounting the temperature sensing bag 3048, and the first guide surface 3021 extends from the support surface 3022 to the direction of the top surface 3019 of the leg 40 in a direction toward the side plate 10.

[0177] Therefore, the support plane 3022 can be used to mount the temperature sensing bag 3048, so that the temperature sensing bag 3048 can be stably accommodated in the mounting space 51. The support plane 3022 is located above the top surface 3019 of the leg 40, and the first guide surface 3021 extends from the support plane 3022 to the top surface 3019 of the leg 40, which means that the first guide surface 3021 is inclined downward relative to the top surface 3019 of the leg 40. Therefore, the first guide surface 3021 can guide the temperature sensing bag 3048, thereby facilitating the installation and removal of the temperature sensing bag 3048, thereby improving the disassembly efficiency of the temperature sensing bag 3048.

[0178] Please refer to Figure 20 In some embodiments, the size of the support plane 3022 is greater than the size of the temperature sensing bag 3048 along the thickness direction of the side plate 10. In this way, the temperature sensing bag 3048 is not easy to slip when mounted on the support plane 3022, thereby improving the stability of the temperature sensing bag 3048 during use.

[0179] Please refer to Figure 20 In some embodiments, the support strip 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, and the size of the second support portion 3024 is smaller than the size of the first support portion 3023 along the arrangement direction of the plurality of support strips 42, and the second support portion 3024 is used to support the temperature sensing bag 3048.

[0180] In this way, the smaller size of the second support portion 3024 can further reduce the area of the mounting seat 50 in contact with the temperature sensing bag 3048, increase the ventilation space around the temperature sensing bag 3048, and facilitate heat dissipation of the temperature sensing bag 3048, thereby further improving the accuracy of temperature measurement.

[0181] Please refer to Figure 18 and Figure 20 In some embodiments, the mounting seat 50 includes a base 3025 and an elastic claw 3026, the base 3025 is connected to the side plate 10, the elastic claw 3026 is protruded from a side of the base 3025 away from the side plate 10, and the elastic claw 3026 and the support strip 42 enclose the mounting space 51.

[0182] In this way, the elastic claw 3026 can cooperate with the support strip 42 to limit the position of the temperature sensing bag 3048, so that the temperature sensing bag 3048 is not easy to move, thereby reducing the probability of the temperature sensing bag 3048 falling off during use, transportation and installation. In addition, the elastic claw 3026 can be elastically deformed, thereby facilitating the removal of the temperature sensing bag 3048 from the mounting space 51.

[0183] Specifically, the elastic claw 3026 can be a claw-shaped structure made of an elastic material. The number of the elastic claw 3026 can be multiple. The multiple elastic claws 3026 can be arranged at intervals along the length direction or the width direction of the mounting seat 50.

[0184] Please refer to Figure 17 , Figure 18 and Figure 20 . In some embodiments, the first end 3027 of the elastic claw 3026 is a free end, the second end 3028 of the elastic claw 3026 is fixedly connected to the base 3025, and the free end can elastically move relative to the leg 40.

[0185] Thus, since the free end of the elastic claw 3026 can elastically move relative to the leg 40, the installation flexibility of the temperature sensing bag 3048 is improved, so that the temperature sensing bag 3048 can be adjusted within a certain range, and the installation and disassembly process of the temperature sensing bag 3048 is more convenient.

[0186] Specifically, the free end is a part of the elastic claw 3026 that can be moved by applying an external force. The fixed end can be fixedly connected to other parts of the mounting seat 50. The fixed connection can be one-piece, welding, riveting, etc.

[0187] Please refer to Figure 17 . In some embodiments, the first end 3027 of the elastic claw 3026 and the support strip 42 form a disassembly opening 3029, and the disassembly opening 3029 is in communication with the installation space 51.

[0188] During assembly, the temperature sensing bag 3048 can be taken out of the installation space 51 through the disassembly opening 3029. And since the first end 3027 of the elastic claw 3026 is a free end, the disassembly process of the temperature sensing bag 3048 is more convenient.

[0189] 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, and the second guide surface 3049 extends away from the top surface 3019 of the leg 40 in the direction of the disassembly opening 3029 along the side plate 10.

[0190] Thus, the second guide surface 3049 can facilitate the operation of the operator. For example, it is convenient for the operator to directly lift the elastic claw 3026 with his hand.

[0191] Please refer to Figure 18 and Figure 20 . In some embodiments, the mounting seat 50 and the leg 40 are integrally formed by a first material.

[0192] Thus, since the mounting seat 50 and the leg 40 are integrally formed by the first material, not only the weight of the mounting seat 50 and the leg 40 as a whole is reduced, but also the manufacturing and assembling process of the whole volute 100 is simplified. The mounting seat 50 and the leg 40 are integrally formed, which improves the integrity of the whole structure and reduces the risk of failure due to the loosening or damage of the connecting part 13. The integrally formed mounting seat 50 and leg 40 reduce the additional assembly steps, simplify the production process, improve the manufacturing efficiency, and reduce the production cost. The integrally formed mounting seat 50 and leg 40 reduce the positional deviation that may occur during the assembly process, ensuring the accuracy and consistency of the structure. Since the positional deviation caused by improper assembly is eliminated, the noise generated by the volute 100 during operation is reduced.

[0193] Specifically, the mounting seat 50 and the leg 40 can be integrally formed by injection molding, 3D printing, etc.

[0194] Please refer to Figure 4 and Figure 21 In some embodiments, the volute 100 is provided with an air outlet 24, and the leg 40 is provided with a wire holder 60, which is located on the side of the leg 40 away from the air outlet 24, and the wire holder 60 is provided with a wire slot 61.

[0195] Thus, by providing the wire holder 60 on the leg 40, the pipelines related to the heating and ventilation system 2000, such as power lines, signal lines, etc., can be conveniently managed and fixed, so that the pipelines can be clamped in the wire slot 61, keeping the whole neat and orderly. At the same time, since it is located on the side of the leg 40 away from the air outlet 24, the influence of airflow on the wire holder 60 and the pipelines is small, which can improve the service life of the wire holder 60 and the pipelines.

[0196] Specifically, the wire holder 60 can be detachably connected with the leg 40 by mechanical elements such as bolts and screws, or can be non-detachably connected by welding, riveting, etc. The number of wire holders 60 can be one or more. For example, the wire holders 60 can be provided on both sides of the length direction of the volute 100. One wire holder 60 can be provided with one or more wire slots 61.

[0197] Please refer to Figure 21 In some embodiments, the wire holder 60 and the leg 40 are integrally formed by the first material.

[0198] In this way, the card line seat 60 and the supporting leg 40 are integrally formed, which improves the integrity of the overall structure and reduces the risk of failure due to loosening or damage of the connecting portion 13. The integrally formed card line seat 60 and supporting leg 40 reduce additional assembly steps, simplify the production process, improve manufacturing efficiency, and reduce production costs. The integrally formed card line seat 60 and supporting leg 40 reduce positional deviations that can occur during assembly, ensuring the accuracy and consistency of the structure. As a result of eliminating positional deviations caused by improper assembly, the noise generated by the volute 100 during operation is reduced. In addition, the card line seat 60 and the supporting leg 40 are both made of the first material, which can reduce the overall weight of the card line seat 60 and the supporting leg 40.

[0199] Specifically, the card line seat 60 and the supporting leg 40 can be integrally formed by injection molding, 3D printing, or the like.

[0200] Please refer to Figure 2 In some embodiments, the volute 100 includes a flange 70 that surrounds the two side plates 10 and the surrounding plate 20.

[0201] The volute 100 is bounded by the flange 70, one side of the flange 70 being the air outlet area 3005 and the other side of the flange 70 being the air inlet area 3006. In the heating and ventilation system 2000, the centrifugal fan 1000 and the indoor heat exchanger 420 can be installed in the first cabinet 310 and the second cabinet 410 of the heating and ventilation indoor unit 2100, the first cabinet 310 and the second cabinet 410 being separated by a partition 2001, the partition 2001 being provided with an opening through which the air outlet area 3005 passes, the flange 70 abutting against the partition 2001, the air inlet area 3006 being located in the first cabinet 310, and the air outlet area 3005 being located in the second cabinet 410, the air blown out by the air outlet area 3005 flowing to the indoor heat exchanger 420 and then to the indoor space through the heat exchange action of the indoor heat exchanger 420, thereby regulating the temperature in the indoor space. The provision of the partition 2001 can ensure the flow path of the air flow and reduce the probability of the air flow flowing out of the centrifugal fan 1000 and then returning from the second cabinet 410 to the first cabinet 310. Therefore, by providing the flange 70 that surrounds the two side plates 10 and the surrounding plate 20, the flange 70 can abut against the partition 2001, thereby increasing the contact area between the volute 100 and the partition 2001, making the connection between the volute 100 and the partition 2001 more stable and reliable, and reducing the gap between the volute 100 and the partition 2001, thereby improving the sealing effect of the centrifugal fan 1000.

[0202] Specifically, the flange 70 can be arranged on one side of the side plate 10 in a direction away from the side plate 10, or arranged on one side of the surrounding plate 20 in a direction away from the surrounding plate 20. The flange 70 can be detachably connected with the side plate 10 by mechanical elements such as screws, bolts, etc., or can be non-detachably connected by welding, riveting, etc. The flange 70 can be detachably connected with the surrounding plate 20 by mechanical elements such as screws, bolts, etc., or can be non-detachably connected by welding, riveting, etc.

[0203] The baffle 14 of the air suction area 3006 does not exceed the flange 70, and the near-volute tongue wall 3007 and the far-volute tongue wall 3008 of the air outlet area 3005 are arranged in smooth planes, which increases the performance of the centrifugal fan 1000.

[0204] Please refer to Figure 2 In some embodiments, the flange 70 includes a first connecting portion 71 and a second connecting portion 72, the first connecting portion 71 is fixedly connected with the side plate 10, and the second connecting portion 72 is detachably connected with the first connecting portion 71.

[0205] In this way, part of the structure of the flange 70 can be disassembled, which can facilitate the installation and disassembly of components such as the side plate 10 and the surrounding plate 20.

[0206] Specifically, the number of the first connecting portion 71 and the second connecting portion 72 can both be two. The two first connecting portions 71 can be arranged on the two side plates 10 respectively. The first connecting portion 71 can be fixedly connected with the side plate 10 by welding, one-piece molding, etc. The second connecting portion 72 can be detachably connected with the two first connecting portions 71 by threaded connection, clamping, etc.

[0207] Please refer to Figure 2 In some embodiments, the first connecting portion 71 and the side plate 10 are a one-piece molding structure.

[0208] In this way, the first connecting portion 71 and the side plate 10 are a one-piece molding structure, which improves the integrity between the flange 70 and the side plate 10, and reduces structural weaknesses caused by improper connection. The one-piece molding of the first connecting portion 71 and the side plate 10 provides a more secure connection, enhances the connection strength of the flange 70 and the side plate 10 of the volute 100, and ensures the stability of the structure. The one-piece molding design simplifies the manufacturing process, avoids additional welding or assembly steps, and reduces production costs and time.

[0209] Specifically, the first connecting portion 71 and the side plate 10 can be one-piece molded by injection molding, 3D printing, etc.

[0210] Please refer to Figure 22 and Figure 23In some embodiments, the second abutting portion 72 abuts against the plane formed by the distal volute tongue wall 3008 and the suction area 3006. In this way, the second abutting 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 baffle 20.

[0211] For reference Figure 23 In some embodiments, the outer circumferential surface 3030 of the distal volute tongue wall 3008 and the outer circumferential surface 3031 of the suction area 3006 are planarly transitioned, the second abutting portion 72 includes an abutting wall 3032 and an abutting wall 3033 connected to the abutting wall 3032, and the abutting wall 3032 abuts against the plane formed by the outer circumferential surface 3030 of the distal volute tongue wall 3008 and the outer circumferential surface 3031 of the suction area 3006.

[0212] In this way, the abutting wall 3032 abuts against the plane formed by the outer circumferential surface 3030 of the distal volute tongue wall 3008 and the outer circumferential surface 3031 of the suction area 3006, which can limit the plane formed by the outer circumferential surface 3030 of the distal volute tongue wall 3008 and the outer circumferential 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 baffle 20.

[0213] Specifically, the abutting wall 3033 can be used to abut against the first abutting portion 71.

[0214] For reference Figure 23 In some embodiments, the first abutting portion 71 is provided with a plug-in slot 710, and the end of the second abutting portion 72 is plugged into the plug-in slot 710.

[0215] In this way, this design simplifies the assembly process, so that the second abutting portion 72 can be quickly and accurately connected with the first abutting portion 71.

[0216] Specifically, the two first abutting portions 71 can be respectively provided with one plug-in slot 710. The two ends of the second abutting portion 72 in the length direction can be respectively plugged into the two plug-in slots 710.

[0217] For reference Figure 24 , Figure 25 and Figure 26 In some embodiments, one of the slot wall of the plug-in slot 710 and the end of the second abutting portion 72 is provided with a first clamping groove 7100, and the other is provided with a first clamping block 720, and the first clamping block 720 is clamped in the first clamping groove 7100 to limit the movement of the second abutting portion 72 away from the baffle 20.

[0218] Thus, by arranging the first clamping groove 7100 and the first clamping block 720 between the groove wall of the insertion groove 710 and the end of the second connecting part 72, the connection firmness between the second connecting part 72 and the first connecting part 71 can be significantly enhanced, the accidental falling or displacement of the second connecting part 72 can be prevented, and the stability of the connection under various working environments can be ensured.

[0219] Specifically, the number of the first clamping groove 7100 and the first clamping block 720 can be one or more. The first clamping groove 7100 and the first clamping block 720 can be arranged one by one.

[0220] Please refer to Figure 23 and Figure 26 In some embodiments, one of the groove wall of the insertion groove 710 and the end of the second connecting part 72 is provided with a first elastic cantilever 3034, and the first clamping block 720 is configured to be located at the free end of the first elastic cantilever 3034.

[0221] Thus, the first elastic cantilever 3034 has the ability of elastic deformation, which makes it easier to disassemble between the first elastic cantilever 3034 and the first clamping block 720. When disassembly is needed, only a certain external force is needed to deform the first elastic cantilever 3034, and the first clamping block 720 can be removed from the first elastic cantilever 3034, thereby achieving quick disassembly.

[0222] Specifically, the first elastic cantilever 3034 can deform when subjected to an external force, and can restore to the original shape after the external force is removed.

[0223] Please refer to Figure 23 In some embodiments, the insertion groove 710 has an insertion opening 7101 arranged away from the side plate 10, and the second connecting part 72 is used to be inserted into the insertion groove 710 through the insertion opening 7101.

[0224] Thus, the arrangement of the insertion opening 7101 away from the side plate 10 makes the second connecting part 72 can use the area between the two side plates 10, thereby helping to improve the space utilization of the whole volute 100.

[0225] Specifically, the two first connecting parts 71 can be respectively provided with one insertion groove 710. The insertion openings 7101 of the two insertion grooves 710 can be oppositely arranged. The directions of the insertion openings 7101 of the two insertion grooves 710 can be opposite.

[0226] Please refer to Figure 23 In some embodiments, the first connecting part 71 is provided with a first limiting part 711, and the two ends of the second connecting part 72 are provided with a second limiting part 721, and the first limiting part 711 and the second limiting part 721 are connected in cooperation to limit the mutual moving away of the two side plates 10.

[0227] Thus, by the cooperation of the limiting portions of the first and second abutting portions 71 and 72, the movement of the two side plates 10 away from each other can be limited, thereby enhancing the stability of the side plates 10 and the rigidity of the overall structure.

[0228] Specifically, the first and second limiting portions 711 and 721 can be provided with threaded holes, clamping holes, protrusions, or the like, so that the limiting can be achieved by threaded connection, clamping, or the like.

[0229] In some embodiments, the second limiting portion 721 and the first clamping groove 7100 are arranged along a direction f from upstream to downstream of the air outlet area 3005. Thus, the second limiting portion 721 and the first clamping groove 7100 have a compact structure, which can improve the overall space utilization of the volute 100.

[0230] 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.

[0231] Thus, the cooperation of the limiting pieces provides an additional locking mechanism, ensuring that the connection between the first and second abutting portions 71 and 72 is more reliable, and reducing the loosening of the connection caused by vibration or external force. Moreover, the first limiting piece 7110 can utilize the area between the two second limiting pieces 7210, thereby helping to improve the overall space utilization of the volute 100. In addition, the limiting by the limiting pieces is relatively simple and easy to manufacture.

[0232] Please refer to Figure 16 In some embodiments, the flange 70 further includes a third abutting portion 3035, the third abutting portion 3035 is arranged corresponding to the volute tongue 22, and the third abutting portion 3035 is detachably connected with the first abutting portion 71.

[0233] Thus, part of the structure of the flange 70 can be detached, which can facilitate the installation and detachment of components such as the side plates 10 and the surrounding plates 20.

[0234] Specifically, the third abutting portion 3035 and the first abutting portion 71 can be detachably connected by threaded connection, clamping, or the like.

[0235] Please refer to Figure 16 , Figure 27 and Figure 28In some embodiments, one of the ends of the first docking portion 71 and the third docking portion 3035 is provided with a second clamping groove 3036, and the other is provided with a second clamping block 3037, the second clamping block 3037 is clamped in the second clamping groove 3036 to limit the movement of the third docking portion 3035 away from the eustachian valve 22.

[0236] In this way, by providing the second clamping groove 3036 and the second clamping block 3037 in the ends of the first docking portion 71 and the third docking portion 3035, the connection firmness between the first docking portion 71 and the third docking portion 3035 can be significantly enhanced, preventing the third docking portion 3035 from accidentally falling off or shifting, and ensuring the stability of the connection under various working environments.

[0237] Specifically, the number of the second clamping groove 3036 and the second clamping block 3037 can be one or more. The second clamping groove 3036 and the second clamping block 3037 can be provided one by one.

[0238] 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 clamping block 3037 is configured to be located at the free end of the second elastic cantilever 3038.

[0239] In this way, the second elastic cantilever 3038 has the ability to elastically deform, which makes it easier to disassemble between the second elastic cantilever 3038 and the second clamping block 3037. When disassembly is needed, only a certain external force is needed to deform the second elastic cantilever 3038, and the second clamping block 3037 can be removed from the second elastic cantilever 3038, thereby achieving quick disassembly.

[0240] Specifically, the second elastic cantilever 3038 can deform when subjected to an external force, and can return to its original shape after the external force is removed.

[0241] Please refer to Figure 16 and Figure 29 In some embodiments, the first docking portion 71 is provided with a third limiting portion 3039, both ends of the third docking portion 3035 are provided with a fourth limiting portion 3040, the third limiting portion 3039 and the fourth limiting portion 3040 are connected in cooperation to limit the movement of the two side plates 10 away from each other, and the fourth limiting portion 3040 and the second clamping groove 3036 are arranged along the direction f from upstream to downstream of the air outlet area 3005.

[0242] Thus, by the cooperation of the third limiting portion 3039 and the fourth limiting portion 3040, the mutual movement of the two side plates 10 away from each other can be limited, thereby enhancing the stability of the side plates 10 and the rigidity of the overall structure. Since the fourth limiting portion 3040 and the second clamping groove 3036 are arranged along the direction f from the upstream to the downstream of the air outlet area 3005, the structure of the fourth limiting portion 3040 and the second clamping groove 3036 is compact, and the space utilization of the whole volute 100 can be improved.

[0243] Specifically, the third limiting portion 3039 and the fourth limiting portion 3040 can be provided with threaded holes, clamping holes, protrusions, etc., so that the limiting can be achieved by threaded connection, clamping, etc.

[0244] 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.

[0245] Thus, the cooperation of the limiting pieces provides an additional locking mechanism, ensuring that the connection between the first abutting portion 71 and the third abutting portion 3035 is more reliable, and reducing the loosening of the connection caused by vibration or external force. Moreover, the third limiting piece 3041 can utilize the area between the two fourth limiting pieces 3042, thereby helping to improve the space utilization of the whole volute 100. In addition, the limiting by the limiting pieces is relatively simple and easy to manufacture.

[0246] Please refer to Figure 16 and Figure 27 In some embodiments, the volute tongue 22 is provided with a first protrusion 3043 protruding away from the far volute tongue wall 3008, and the third abutting portion 3035 is provided with a first curved surface 3044 abutting against the first protrusion 3043.

[0247] Thus, by providing the first protrusion 3043 and the first curved surface 3044, the connection between the volute tongue 22 and the third abutting portion 3035 is more tight, thereby reducing the noise generated by the relative movement between the volute tongue 22 and the third abutting portion 3035 during operation.

[0248] Please refer to Figure 16 and Figure 27 In some embodiments, the volute tongue 22 is provided with a second protrusion 3045 protruding away from the far volute tongue wall 3008, the second protrusion 3045 is located between the side plate 10 and the first protrusion 3043, and the third abutting portion 3035 is provided with a second curved surface 3046 abutting against the second protrusion 3045.

[0249] Thus, by setting the second convex 3045 and the second curved surface 3046, the connection between the distal cochlear wall 3008 and the third connecting portion 3035 is more closely, so as to reduce the noise generated by the relative movement between the distal cochlear wall 3008 and the third connecting portion 3035 during operation.

[0250] Please refer to Figure 27 In some embodiments, the third connecting portion 3035 is provided with a type groove 3047 close to the second curved surface 3046. Thus, the setting of the type groove 3047 can reduce the shrinkage of the third connecting portion 3035 during injection molding, so as to improve the accuracy of the second curved surface 3046, thereby reducing the gap between the second curved surface 3046 and the second convex 3045, so that the connection between the distal cochlear wall 3008 and the third connecting portion 3035 is more closely, so as to reduce the noise generated by the relative movement between the distal cochlear wall 3008 and the third connecting portion 3035 during operation.

[0251] In the third aspect, please refer to Figure 1 The utility model embodiment provides a kind of heating and ventilation indoor unit 2100, and heating and ventilation indoor unit 2100 includes centrifugal fan 1000 of any embodiment described above.

[0252] Thus, by centrifugal fan 1000 accelerates airflow, so as to facilitate the circulation of air, improve heat exchange effect.

[0253] Specifically, by the thickness of the blade 202 in the impeller 200 changes with a certain trend, the profile of the blade 202 is optimized, so as to reduce the vortex and the pressure difference, improve the efficiency of the fan, and improve the noise problem. The end of the blade 202 away from the disc 201 is provided with a reinforcing frame, and the reinforcing frame forms a groove with the convex part and the base ring, so as to improve the structural strength and avoid the risk of shrinkage. It can also block the reverse airflow, reduce noise and improve wind pressure performance.

[0254] Please refer to Figure 1 and Figure 30 In some embodiments, the heating and ventilation indoor unit 2100 includes a first machine 300 and a second machine 400, the first machine 300 includes a first box 310 and a centrifugal fan 1000, the centrifugal fan 1000 is arranged in the first box 310, the second machine 400 includes a second box 410 and an indoor heat exchanger 420, the indoor heat exchanger 420 is arranged in the second box 410, and the first box 310 and the second box 410 are detachably connected.

[0255] Thus, by centrifugal fan 1000 and indoor heat exchanger 420 cooperate in the detachably connected first machine 300 and second machine 400, so as to accelerate the circulation and heat exchange of air, and improve the efficiency of the heating and ventilation indoor unit 2100.

[0256] Specifically, the first cabinet 310 can be detachably connected with the second cabinet 410 by at least one of a fixing connection, a clamping and connecting, a screwing, a riveting, a gluing connection, etc. The first cabinet 310 and the second cabinet 410 can be arranged side by side along a width direction or a length direction of the air conditioning indoor unit 2100. For example, the first cabinet 310 and the second cabinet 410 are both square cabinets, and the first cabinet 310 and the second cabinet 410 are arranged side by side along the width direction. The side walls of the first cabinet 310 and the second cabinet 410 in the width direction are opposite to each other and can be attached to each other or spaced apart by a small gap 15. The centrifugal fan 1000 and the indoor heat exchanger 420 can be arranged separately by the opposite walls of the first cabinet 310 and the second cabinet 410.

[0257] In a fourth aspect, referring to Figure 31 The application provides an air conditioning system 2000, which comprises the air conditioning indoor unit 2100 and the air conditioning outdoor unit 2200 of any of the above embodiments, and the air conditioning outdoor unit 2200 is connected with the air conditioning indoor unit 2100 through the pipeline 2300.

[0258] In this way, the air flow in the air conditioning indoor unit 2100 is accelerated by the centrifugal fan 1000, thereby improving the heat exchange effect of the air conditioning system 2000 on indoor and outdoor.

[0259] Specifically, the air conditioning outdoor unit 2200 has a compressor 500, a flow path switching device 600, an outdoor heat exchanger 700, and an expansion valve 800. The compressor 500 compresses and discharges the sucked refrigerant. The flow path switching device 600, for example, is a four-way valve, and is a device that switches the direction of the refrigerant flow path.

[0260] The outdoor heat exchanger 700 performs heat exchange between the refrigerant and the outdoor air. The outdoor heat exchanger 700 functions as an evaporator during heating operation, and performs heat exchange between the low-pressure refrigerant flowing from the refrigerant pipe and the outdoor air, so that the refrigerant evaporates and vaporizes.

[0261] The outdoor heat exchanger 700 functions as a condenser during cooling operation, and performs heat exchange between the refrigerant compressed by the compressor 500 and flowing from the flow path switching device 600 side and the outdoor air, so that the refrigerant condenses and liquefies.

[0262] A centrifugal fan 1000 can also be provided 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 800 by adjusting the flow rate of the refrigerant flowing in the expansion valve 800, and adjusts the pressure of the refrigerant by changing the opening degree.

[0263] In one example, when the heating and cooling system 2000 is cooling, the high-temperature and high-pressure gas refrigerant compressed and ejected by the compressor 500 flows into the outdoor heat exchanger 700 via the flow path switching device 600. The gas refrigerant that has flowed into the outdoor heat exchanger 700 is condensed by heat exchange with outside air that is blown out by the outdoor blower, and becomes low-temperature refrigerant, and flows out from the outdoor heat exchanger 700.

[0264] The refrigerant that has flowed out from the outdoor heat exchanger 700 is expanded and depressurized by the expansion valve 800, and becomes low-temperature and low-pressure gas-liquid two-phase refrigerant. This gas-liquid two-phase refrigerant flows into the indoor heat exchanger 420 of the heating and cooling indoor unit 2100, is evaporated by heat exchange with indoor air that is blown out by the indoor blower, and becomes low-temperature and low-pressure gas refrigerant, and flows out from the indoor heat exchanger 420.

[0265] At this time, the indoor air that has been cooled by the refrigerant becomes air-conditioned air, and is blown out to the air-conditioned space from the blowout port of the heating and cooling indoor unit 2100. The gas refrigerant that has flowed out from the indoor heat exchanger 420 is sucked into the compressor 500 via the flow path switching device 600, and is compressed again. The above operation is repeated.

[0266] In summary, in one embodiment, the volute 100 includes a surrounding plate 20 and two oppositely arranged side plates 10. The surrounding plate 20 extends circumferentially to form a volute profile 3001. The two oppositely arranged side plates 10 are respectively connected to the two sides of the surrounding plate 20, and at least one side plate 10 is provided with an air inlet 11; wherein the at least one side plate 10 is detachably connected to the surrounding plate 20

[0267] In the volute 100 described above, the at least one side plate 10 is detachably connected to the surrounding plate 20, so that the volute 100 can be formed by separately molding a plurality of components and assembling, and the manufacturing cost is lower than that of an integrally molded volute 100.

[0268] In the description of this specification, the description referring to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the described embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0269] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A volute, characterized in that, The application relates to a volute casing, comprising: a surrounding plate extending circumferentially to form a volute line, two oppositely arranged side plates connected to the two sides of the surrounding plate, at least one of the side plates being provided with an air inlet; wherein at least one of the side plates is detachably connected to the surrounding plate; each of the side plates has a base plate configured as an outer side of the volute, and the side plate has a connecting portion extending from the base plate towards the other side plate and detachably lapping the edge portion of the surrounding plate.

2. The volute of claim 1, wherein The connecting portion extends along the volute line, and the connecting portion has a plurality of fastening portions arranged at intervals along the circumferential extension track, and the plurality of fastening portions are detachably connected to the edge portion of the surrounding plate.

3. The volute of claim 2, wherein, The side plate is provided with a stop edge opposite to the connecting portion, and a gap is formed between the stop edge and the connecting portion, and the edge portion of the surrounding plate is inserted into the gap.

4. The volute of claim 3, wherein The stop edge is provided with a supporting protrusion located in the gap, and the supporting protrusion is in abutment with the edge portion of the surrounding plate.

5. A volute according to any one of claims 2 to 4, wherein, The fastening portion is configured as a boss protruding from one side of the connecting portion away from the surrounding plate, and a mounting hole is formed in the top surface of the boss away from the surrounding plate, and the mounting hole is opposite to an adapting hole of the edge side of the surrounding plate, and a fastener is arranged to pass through and fix the mounting hole.

6. The volute of claim 5, wherein, The top surface of the boss away from the surrounding plate is configured as a plane, and the top surface is in surface abutment with the head portion of the fastener.

7. The volute of claim 1, wherein The volute line is configured as an air outlet area, an air inlet area and a volute tongue between the air outlet area and the air inlet area, the air outlet area comprises oppositely arranged near-tongue walls and far-tongue walls, the near-tongue walls are connected to the air inlet area through the volute tongue, and air flows from the air inlet area to the air outlet area through the air inlet area and the air inlet area, and then flows out of the volute casing; wherein the connecting portion comprises a first connecting portion, a second connecting portion and a third connecting portion, the first connecting portion extends along the line of the far-tongue wall and is detachably lapped and fixed to the far-tongue wall, the second connecting portion extends along the line of the near-tongue wall and is detachably lapped and fixed to the near-tongue wall, and the third connecting portion extends along the line of the air inlet area and is detachably lapped and fixed to the plate wall of the air inlet area.

8. The volute of claim 7, wherein, At least one of the side plates has a stop edge extending from the base plate towards the other side plate, the stop edge is located in the air inlet area and oppositely arranged with the second connecting portion to form a gap, and the edge portion of the surrounding plate is inserted into the gap.

9. The volute of claim 8, wherein, The inner surface of the first connecting portion and the second connecting portion towards the surrounding plate is defined as an inner surface, the inner surface of the first connecting portion is recessed with a first lapping groove, and the far-tongue wall is lapped in the first lapping groove, and the inner surface of the second connecting portion is recessed with a second lapping groove, and the near-tongue wall is lapped in the second lapping groove.

10. The volute of claim 9, wherein, The inner surface of the first connecting portion is flush with the near-tongue wall, and the inner surface of the second connecting portion is flush with the far-tongue wall.

11. The volute of claim 10, wherein, Each of the base plates comprises a first base plate and a second base plate, two first base plates cover two sides of the air suction area, two second base plates cover two sides of the air outlet area, two first base plates are parallel to each other, from the upstream to the downstream of the air outlet area, two second base plates extend away from each other at an angle, the second base plate has the first connecting part and the second connecting part, the width of the first connecting part and the second connecting part gradually increases from the upstream to the downstream of the air outlet area, the first lap joint groove, the second lap joint groove, and the third connecting part are arranged with the same width.

12. The volute of claim 7, wherein, The connecting part further comprises a fourth connecting part connected between the second connecting part and the third connecting part, extending along the profile of the volute tongue and supporting the volute tongue.

13. The volute of claim 1, wherein, 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.

14. The volute of claim 13, wherein, The first material is plastic, and the second material is metal.

15. The volute of claim 13, wherein, Each of the side plates has a base plate configured as the outer profile of the volute, the at least one side plate is made of plastic, and the surrounding plate is made of metal, the space between the two base plates is defined as the inner side, the side plate made of the first material has a flow guide ring integrally extending inward from the base plate, and the flow guide ring forms the air inlet.

16. The volute of claim 15, wherein, Both of the side plates are integrally made of plastic, each of the side plates is detachably connected to the surrounding plate, each of the side plates has the flow guide ring, the flow guide rings of the two side plates extend towards each other, and the two air inlets formed by the two side plates are coaxially arranged.

17. The volute of claim 16, wherein, Both of the side plates are configured to be mirror-symmetric.

18. The volute of any of claims 1-4, 6-15, wherein, One of the two side plates is made of plastic, and the other side plate and the surrounding plate are made of metal, the side plate made of plastic forms the air inlet, and the side plate made of metal is provided with a driving motor.

19. A centrifugal fan, characterized by Comprising: The volute according to any one of claims 1-18; And The impeller is accommodated in the volute.

20. A heating and ventilating indoor unit, characterized by comprising: Comprising: The centrifugal fan according to claim 19.

21. The air heating and ventilating indoor unit according to claim 20, wherein The heating and ventilation indoor unit comprises a first machine and a second machine, the first machine comprises a first box body and the centrifugal fan, the centrifugal fan is arranged in the first box body, the second machine comprises a second box body and an indoor heat exchanger, the indoor heat exchanger is arranged in the second box body, and the first box body and the second box body are detachably connected.

22. A heating and ventilation system, characterised in that, Comprising: The heating and ventilation indoor unit according to claim 20 or 21; And a heating and ventilation outdoor unit, the heating and ventilation outdoor unit is connected with the heating and ventilation indoor unit through a pipeline.

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