Ducted air conditioner and centrifugal fan

Abstract

The utility model discloses a ducted air conditioner and a centrifugal fan, which comprise a casing, a fan cover, a fan cover and a fan cover, wherein the casing is provided with an air inlet and an air outlet; a heat exchanger; an air duct member; the centrifugal fan comprises a first impeller and a second impeller, the first impeller comprises a plurality of first blades, the first blades are arranged at intervals in the circumferential direction of the first impeller, the sides, close to the central axis of the first impeller, of the first blades are air inlet sides, and the sides, away from the central axis of the first impeller, of the first blades are air outlet sides; the second impeller comprises a plurality of second blades, the second blades are arranged at intervals in the circumferential direction of the second impeller, and the first blades and the second blades are alternately arranged in the circumferential direction of the centrifugal fan; in the radial direction of the first impeller, the second blades are adjacent to the air inlet side, and the width of the second blades is smaller than that of the first blades. According to the ducted air conditioner, the air inlet vortex of the centrifugal fan can be improved, and the ducted air conditioner has the advantages of being high in air guide efficiency, low in noise and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air duct machine and a centrifugal fan. Background Art

[0002] The duct machine in the related technology is usually equipped with a centrifugal fan and a heat exchanger. The centrifugal fan is arranged in the duct member, and the duct member and the heat exchanger are arranged in the casing. The centrifugal fan can drive air into the casing from the air inlet, and the air flows to the heat exchanger through the duct member, and then enters the room through the air outlet after exchanging heat with the heat exchanger to form a heat exchange airflow.

[0003] Among them, a centrifugal fan is usually provided with a plurality of blades, and the plurality of blades are arranged at intervals along the circumference of the centrifugal fan. The end of the blade facing the central axis of the centrifugal fan is the air inlet side, and the end of the blade away from the central axis of the centrifugal fan is the air outlet side. When the centrifugal fan is running, the centrifugal fan can take in air axially and discharge air radially.

[0004] However, when the centrifugal fan in the related art is in operation, after the air enters the impeller of the centrifugal fan, a separation vortex exists near the suction surface of the blade, which affects the air guiding efficiency of the centrifugal fan and increases the noise. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a ducted air conditioner, which can improve the air inlet vortex of the centrifugal fan and has the advantages of high air guiding efficiency and low noise.

[0006] The utility model also provides a centrifugal fan.

[0007] In order to achieve the above-mentioned purpose, according to the first aspect of the utility model, an air duct machine is proposed, comprising: a casing, the casing having an air inlet and an air outlet formed on two opposite sides; a heat exchanger, the heat exchanger is arranged in the casing and adjacent to the air outlet; an air duct member, the air duct member is arranged in the casing and located on one side of the heat exchanger; a centrifugal fan, the centrifugal fan is arranged in the air duct member, the centrifugal fan drives air to enter the casing from the air inlet, and the air flows to the heat exchanger through the air duct member, and enters the room through the air outlet after exchanging heat with the heat exchanger to form a heat exchange airflow; the centrifugal fan comprises: a first impeller, The first impeller includes a plurality of first blades, which are arranged at intervals along the circumference of the first impeller, and the side of the first blade close to the central axis of the first impeller is the air inlet side, and the side of the first blade away from the central axis of the first impeller is the air outlet side; the second impeller includes a plurality of second blades, which are arranged at intervals along the circumference of the second impeller, and the plurality of first blades and the plurality of second blades are alternately arranged along the circumference of the centrifugal fan; wherein, along the radial direction of the first impeller, the second blade is adjacent to the air inlet side, and the width of the second blade is smaller than the width of the first blade.

[0008] The duct machine according to the embodiment of the utility model can improve the air intake vortex of the centrifugal fan, and has the advantages of high air guiding efficiency and low noise.

[0009] According to some embodiments of the present invention, the first impeller and the second impeller are coaxially arranged, and along the radial direction of the centrifugal fan, the inner diameter of the first impeller is equal to the inner diameter of the second impeller.

[0010] According to some embodiments of the present invention, along the radial direction of the centrifugal fan, the inner diameter of the first impeller is D 1 , the outer diameter of the first impeller is D 2 ; Wherein, the outer diameter D of the second impeller satisfies: 2D 1 / 3+D 2 / 3≤D≤D 1 / 2+D 2 / 2.

[0011] According to some embodiments of the present invention, the distance between each of the second blades and the adjacent first blade is the same.

[0012] According to some embodiments of the utility model, the centrifugal fan also includes: a fixed disk, a plurality of first impellers disposed on opposite sides of the fixed disk in a thickness direction, and a plurality of second impellers disposed on opposite sides of the fixed disk in a thickness direction, one end of the first blade and one end of the second blade being connected to the fixed disk.

[0013] According to some embodiments of the present invention, along the circumferential direction of the fixed disk, a plurality of first blades of the first impellers are arranged in a staggered manner, and a plurality of second blades of the second impellers are arranged in a staggered manner.

[0014] According to some embodiments of the utility model, the first impeller also includes: a first skirt, which is connected to the other end of the plurality of first blades; the second impeller also includes: a second skirt, which is connected to the other end of the plurality of second blades; wherein the side of the first skirt facing away from the fixed disk is flush with the side of the second skirt facing away from the fixed disk.

[0015] According to some embodiments of the present utility model, the other end of the first blade is provided with a notch, the notches of a plurality of the first blades define an escape portion, and the second skirt is located in the escape portion.

[0016] According to some embodiments of the present invention, along the radial direction of the second impeller, a side of the plurality of second blades away from the central axis of the second impeller defines an outer circle, and a portion of the first impeller located within the outer circle has the same bending direction as the second blades.

[0017] According to the second aspect of the utility model, an embodiment of the present invention provides a centrifugal fan, comprising: a first impeller, the first impeller comprising a plurality of first blades, the plurality of first blades being arranged at intervals along the circumference of the first impeller, the side of the first blade close to the central axis of the first impeller being the air inlet side, and the side of the first blade away from the central axis of the first impeller being the air outlet side; a second impeller, the second impeller comprising a plurality of second blades, the plurality of second blades being arranged at intervals along the circumference of the second impeller, and at least one second blade being provided between two adjacent first blades; wherein, along the radial direction of the first impeller, the second blade is adjacent to the air inlet side or the air outlet side, and the width of the second blade is smaller than the width of the first blade.

[0018] The centrifugal fan according to the embodiment of the second aspect of the utility model can improve the air intake vortex, and has the advantages of high air guiding efficiency and low noise.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a structural schematic diagram of a centrifugal fan according to an embodiment of the utility model;

[0022] Figure 2 yes Figure 1 Detailed view of A;

[0023] Figure 3 is a structural schematic diagram of a centrifugal fan according to an embodiment of the utility model from another perspective;

[0024] Figure 4 yes Figure 3 Detailed view of B;

[0025] Figure 5 is a schematic structural diagram of a first blade and a second blade of a centrifugal fan according to an embodiment of the utility model;

[0026] Figure 6 yes Figure 5 Detailed view of C;

[0027] Figure 7 is a structural schematic diagram of a first impeller of a centrifugal fan according to an embodiment of the utility model;

[0028] Figure 8 yes Figure 7 Detailed view of D;

[0029] Fig. 9 is a schematic structural diagram of a second impeller of a centrifugal fan according to an embodiment of the utility model;

[0030] Fig.10 yes Fig. 9 Detailed view of E.

[0031] Reference numerals:

[0032] 1. Centrifugal fan;

[0033] 100, first impeller; 110, first blade; 111, notch; 120, air inlet side; 130, air outlet side; 140, first skirt;

[0034] 200, second impeller; 210, second blade; 220, second skirt;

[0035] 300. Fixed disk. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0039] In the description of the present invention, "multiple" means two or more, and "several" means one or more.

[0040] A centrifugal fan 1 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0041] like Figure 1-Figure 10 As shown, the duct machine according to the embodiment of the utility model includes a casing, a heat exchanger, an air duct component and a centrifugal fan 1.

[0042] The casing is formed with an air inlet and an air outlet on two opposite sides. The heat exchanger is arranged in the casing and adjacent to the air outlet. The air duct member is arranged in the casing and located on one side of the heat exchanger. The centrifugal fan 1 is arranged in the air duct member. The centrifugal fan 1 drives air to enter the casing from the air inlet, and the air flows to the heat exchanger through the air duct member. After exchanging heat with the heat exchanger to form a heat exchange airflow, the air enters the room through the air outlet.

[0043] The centrifugal fan 1 includes a first impeller 100 and a second impeller 200 .

[0044] The first impeller 100 includes a plurality of first blades 110, which are arranged at intervals along the circumference of the first impeller 100, and the side of the first blade 110 close to the central axis of the first impeller 100 is the air inlet side 120, and the side of the first blade 110 away from the central axis of the first impeller 100 is the air outlet side 130. The second impeller 200 includes a plurality of second blades 210, which are arranged at intervals along the circumference of the second impeller 200, and the plurality of first blades 110 and the plurality of second blades 210 are alternately arranged along the circumference of the centrifugal fan 1. In the radial direction of the first impeller 100, the second blade 210 is adjacent to the air inlet side 120, and the width of the second blade 210 is smaller than the width of the first blade 110.

[0045] The casing can be installed on the roof, that is, the duct machine can be fixed on the roof.

[0046] For example, a plurality of air duct members and a plurality of centrifugal fans 1 may be provided in the casing, the plurality of centrifugal fans 1 are installed in the casing in a one-to-one correspondence, and the plurality of air duct members may be arranged at intervals along the length direction of the air inlet.

[0047] In addition, the casing may have multiple air inlets, for example, one for outdoor fresh air and another for indoor air, so that the duct machine of the embodiment of the utility model can selectively introduce outdoor fresh air to purify indoor air.

[0048] According to the duct machine of the embodiment of the utility model, the casing is provided with an air inlet and an air outlet on two sides opposite to each other, the heat exchanger is arranged in the casing and adjacent to the air outlet, the air duct member is arranged in the casing and located on one side of the heat exchanger, the centrifugal fan 1 is arranged in the air duct member, the centrifugal fan 1 drives the air to enter the casing from the air inlet, and the air flows to the heat exchanger through the air duct member, and enters the room through the air outlet after heat exchange with the heat exchanger to form a heat exchange airflow. Thus, the centrifugal fan 1 can guide the air to enter the casing, and the air exchanges heat with the heat exchanger in the casing, thereby forming a heat exchange airflow, and the heat exchange airflow flows back to the room through the air outlet, thereby cooling or heating the room.

[0049] In addition, the first impeller 100 includes a plurality of first blades 110, which are arranged at intervals along the circumference of the first impeller 100, and the side of the first blade 110 close to the central axis of the first impeller 100 is the air inlet side 120, and the side of the first blade 110 away from the central axis of the first impeller 100 is the air outlet side 130. The second impeller 200 includes a plurality of second blades 210, which are arranged at intervals along the circumference of the second impeller 200, and the plurality of first blades 110 and the plurality of second blades 210 are alternately arranged along the circumference of the centrifugal fan 1. In this way, there may be a gap between the first blade 110 and the second blade 210, and when the centrifugal fan 1 is running, the airflow may flow through the gap between the first blade 110 and the second blade 210, so that the airflow may flow from the side of the first blade 110 and the second blade 210 facing the central axis of the centrifugal fan 1 to the side away from the central axis of the centrifugal fan 1, thereby realizing the axial air intake and radial air outlet of the centrifugal fan 1.

[0050] In addition, along the radial direction of the first impeller 100 , the second blade 210 is adjacent to the wind inlet side 120 , and the width of the second blade 210 is smaller than the width of the first blade 110 .

[0051] It can be understood that along the radial direction of the centrifugal fan 1, the first blade 110 and the second blade 210 can be curved or straight, the width of the first blade 110 refers to the size of the first blade 110 along the flow direction of the airflow, and the width of the second blade 210 refers to the size of the second blade 210 along the flow direction of the airflow.

[0052] By setting the width of the second blade 210 to be smaller, the centrifugal fan 1 can be a structural setting in which long blades and short blades are arranged alternately, and the short blades are adjacent to the air inlet side 120 of the first impeller 100. In this way, the second blade 210 can be used to avoid the generation of eddy currents on the air inlet side 120 of the first impeller 100, thereby improving the air guiding efficiency of the centrifugal fan 1, so that the air guiding effect is better, and it is beneficial to reduce the operating noise of the centrifugal fan 1, and the user experience is better.

[0053] In this way, the air duct machine according to the embodiment of the utility model can improve the air intake vortex of the centrifugal fan 1, and has the advantages of high air guiding efficiency and low noise.

[0054] In some specific embodiments of the present invention, Figure 3 and Figure 4 As shown, the first impeller 100 and the second impeller 200 are coaxially arranged, and along the radial direction of the centrifugal fan 1, the inner diameter of the first impeller 100 is equal to the inner diameter of the second impeller 200.

[0055] Among them, the inner diameter of the first impeller 100 refers to the diameter of the circumference formed by the multiple first blades 110 on the side facing the central axis of the centrifugal fan 1, and the inner diameter of the second impeller 200 refers to the diameter of the circumference formed by the multiple second blades 210 on the side facing the central axis of the centrifugal fan 1.

[0056] That is, along the radial direction of the centrifugal fan 1, the side of the first blade 110 facing the central axis of the centrifugal fan 1 and the side of the second blade 210 facing the central axis of the centrifugal fan 1 are on the same circumference. This arrangement can ensure the smoothness of the air intake of the centrifugal fan 1, so that the air intake efficiency of the centrifugal fan 1 can be higher, and then the air guide efficiency of the centrifugal fan 1 can be improved, the air guide volume of the centrifugal fan 1 can be higher, and the air guide effect is better.

[0057] Furthermore, along the radial direction of the centrifugal fan 1, the inner diameter of the first impeller 100 is D 1 , the outer diameter of the first impeller 100 is D 2 , the outer diameter D of the second impeller 200 satisfies: 2D 1 / 3+D 2 / 3≤D≤D 1 / 2+D 2 / 2.

[0058] Such arrangement, on the one hand, can prevent the outer diameter of the second impeller 200 from being too small, that is, prevent the width of the second blade 210 from being too small, and the second blade 210 can effectively guide the airflow, thereby more effectively preventing the generation of vortex on the air inlet side 120 of the first impeller 100, so that the centrifugal fan 1 has a better air guiding effect. On the other hand, it can prevent the outer diameter of the second impeller 200 from being too small, that is, prevent the width of the second blade 210 from being too large, so that there can be a significant difference between the width of the second blade 210 and the width of the first blade 110, and the second blade 210 can better improve the air inlet vortex of the centrifugal fan 1 and improve the air guiding efficiency of the centrifugal fan 1.

[0059] In some specific embodiments of the present invention, Figure 3 and Figure 4 As shown, the distance between each second blade 210 and the adjacent first blade 110 is the same.

[0060] That is, along the radial direction of the centrifugal fan 1, the distance between the first blade 110 and the second blade 210 on opposite sides of the second blade 210 in the thickness direction is the same. In other words, the plurality of first blades 110 and the plurality of second blades 210 are alternately and evenly distributed.

[0061] It can be understood that air flow channels will be formed with different first blades 110 on the opposite sides of the second blade 210 in the thickness direction, and the air flow can flow through the air flow channel between the second blade 210 and the first blade 110. By setting the distance between the second blade 210 and the adjacent first blade 110 to be the same, the sizes of the air flow channels between different first blades 110 and second blades 210 can be the same, thereby ensuring that the wind guiding effects between different first blades 110 and second blades 210 are consistent, so that the wind guiding effects at different circumferential positions of the centrifugal fan 1 are the same, and the wind guiding is more uniform.

[0062] In some specific embodiments of the present invention, Figure 1-Figure 4 As shown, the centrifugal fan 1 may include a fixing plate 300 .

[0063] There are multiple first impellers 100 and disposed on opposite sides of the fixed plate 300 in the thickness direction, and there are multiple second impellers 200 and disposed on opposite sides of the fixed plate 300 in the thickness direction, and one end of the first blade 110 and one end of the second blade 210 are connected to the fixed plate 300.

[0064] The first blade 110 and the second blade 210 may be welded to the fixing plate 300 by laser.

[0065] For example, a first impeller 100 and a second impeller 200 are provided on one side in the thickness direction of the fixed plate 300, and a first impeller 100 and a second impeller 200 are provided on the other side in the thickness direction of the fixed plate 300. In this way, the fixed plate 300 can fix a plurality of first impellers 100 and a plurality of second impellers 200, so that the plurality of first impellers 100 and the plurality of second impellers 200 can be connected into a whole.

[0066] Moreover, with such an arrangement, the fixed disk 300 is the middle disk of the centrifugal fan 1, and the centrifugal fan 1 can take in air along both sides of its axial direction, and the air intake on both sides is respectively guided by different first impellers 100 and second impellers 200, thereby realizing radial air supply of the centrifugal fan 1, and the airflows between different first impellers 100 will not interfere with each other, which is beneficial to improving the wind guiding effect of the centrifugal fan 1.

[0067] Furthermore, if Figure 3 and Figure 4 As shown, along the circumferential direction of the fixed disk 300 , the first blades 110 of the plurality of first impellers 100 are arranged in a staggered manner, and the second blades 210 of the plurality of second impellers 200 are arranged in a staggered manner.

[0068] Specifically, along the circumferential direction of the fixed disk 300, the first blade 110 on one side of the thickness direction of the fixed disk 300 can be located between the two first blades 110 in the thickness direction of the fixed disk 300, thereby realizing the staggered arrangement of the first blades 110 on both sides of the fixed disk 300; and, along the circumferential direction of the fixed disk 300, the second blade 210 on one side of the thickness direction of the fixed disk 300 can be located between the two second blades 210 in the thickness direction of the fixed disk 300, thereby realizing the staggered arrangement of the second blades 210 on both sides of the fixed disk 300.

[0069] Thus, the air outlets of the multiple first impellers 100 on both sides of the fixed disk 300 can be staggered to avoid interference between the air outlets of the multiple first impellers 100 , further improving the air outlet efficiency of the centrifugal fan 1 , achieving better air outlet effects and lower air outlet noise.

[0070] In some specific embodiments of the present invention, Figure 1-Figure 4 , Figure 7-Figure 10 As shown, the first impeller 100 may include a first skirt 140 , and the second impeller 200 may include a second skirt 220 .

[0071] The first skirt 140 is connected to the other end of the plurality of first blades 110 , and the second skirt 220 is connected to the other end of the plurality of second blades 210 , wherein a side of the first skirt 140 facing away from the fixing plate 300 is flush with a side of the second skirt 220 facing away from the fixing plate 300 .

[0072] Among them, the first skirt 140 can be connected to the radial outer side of the first blade 110, and the side of the first skirt 140 facing away from the fixed disk 300 can be flush with the end of the first blade 110 away from the fixed disk 300; the second skirt 220 can be connected to the radial outer side of the second blade 210, and the side of the second skirt 220 facing away from the fixed disk 300 can be flush with the end of the second blade 210 away from the fixed disk 300.

[0073] It can be understood that one end of the multiple first blades 110 can be fixed to the fixed plate 300, and the first skirt 140 can fix the other end of the multiple first blades 110 to prevent the multiple first blades 110 from shaking; and one end of the multiple second blades 210 can be fixed to the fixed plate 300, and the second skirt 220 can fix the other end of the multiple second blades 210 to prevent the multiple second blades 210 from shaking, which is beneficial to improving the structural stability of the centrifugal fan 1, and the wind guiding effect of the first blades 110 and the second blades 210 is better.

[0074] Moreover, by setting the side of the first skirt 140 facing away from the fixed plate 300 to be flush with the side of the second skirt 220 facing away from the fixed plate 300, the first skirt 140 will not exceed the second skirt 220, and the second skirt 220 will not exceed the first skirt 140 along the axial direction of the centrifugal fan 1, so that the structural setting of the centrifugal fan 1 is more regular and convenient for layout.

[0075] In addition, with such an arrangement, along the axial direction of the centrifugal fan 1, the length of the first blade 110 and the length of the second blade 210 can be the same, the air intake of the first impeller 100 and the air intake of the second impeller 200 can completely overlap, and the second blade 210 can more effectively avoid the generation of vortices in the air intake of the first impeller 100.

[0076] In some specific embodiments of the present invention, Figure 2 As shown, a notch 111 is provided at the other end of the first blade 110 , and the notches 111 of the plurality of first blades 110 define an escape portion, and the second skirt 220 is located in the escape portion.

[0077] For example, the other end of the first blade 110 can be beveled on the side close to the central axis of the centrifugal fan 1 so that a notch 111 can be formed on the other end of the first blade 110 on the side close to the central axis of the centrifugal fan 1, and the notches 111 of multiple first blades 110 can form an avoidance portion, so that the avoidance portion can be used to accommodate the second skirt 220 so that in the axial direction of the centrifugal fan 1, the second skirt 220 and the first skirt 140 can remain flush.

[0078] In some specific embodiments of the present invention, Figure 4 and Figure 6 As shown, along the radial direction of the second impeller 200 , the second blades 210 on one side away from the central axis of the second impeller 200 define an outer circle, and the portion of the first impeller 100 located within the outer circle has the same bending direction as the second blades 210 .

[0079] The centrifugal fan 1 may be a forward centrifugal fan 1 or a backward centrifugal fan 1 .

[0080] That is to say, the shape of the second blade 210 is the same as the shape of the portion of the first blade 110 adjacent to the central axis of the centrifugal fan 1, so that the spacing between different parts of the second blade 210 and the first blade 110 can be the same, and the air flow area between the first blade 110 and the second blade 210 can be the same, thereby making the air flow between the first blade 110 and the second blade 210 more uniform, which is beneficial to improving the wind guiding effect of the centrifugal fan 1 and making the air output more uniform.

[0081] A centrifugal fan 1 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0082] like Figure 1-Figure 10 As shown, the centrifugal fan 1 includes a first impeller 100 and a second impeller 200 .

[0083] The first impeller 100 includes a plurality of first blades 110, which are arranged at intervals along the circumference of the first impeller 100, a side of the first blade 110 close to the central axis of the first impeller 100 is an air inlet side 120, and a side of the first blade 110 away from the central axis of the first impeller 100 is an air outlet side 130, and the second impeller 200 includes a plurality of second blades 210, which are arranged at intervals along the circumference of the second impeller 200, and at least one second blade 210 is provided between two adjacent first blades 110.

[0084] In which, along the radial direction of the first impeller 100 , the second blade 210 is adjacent to the air inlet side 120 or the air outlet side 130 , and the width of the second blade 210 is smaller than the width of the first blade 110 .

[0085] It should be noted that one second blade 210 or a plurality of second blades 210 may be provided between adjacent first blades 110 , and the second blade 210 may be adjacent to the air inlet side 120 or the air outlet side 130 .

[0086] Therefore, by arranging the second blade 210 with a smaller width between the adjacent first blades 110, the second blade 210 can be used to avoid the generation of vortexes in the incoming air of the centrifugal fan 1, thereby improving the air guiding efficiency of the centrifugal fan 1, achieving a better air guiding effect, and helping to reduce the operating noise of the centrifugal fan 1, thereby providing a better user experience.

[0087] The centrifugal fan 1 according to the embodiment of the utility model can improve the air intake vortex, and has the advantages of high air guiding efficiency and low noise.

[0088] Other structures and operations of the duct machine and the centrifugal fan 1 according to the embodiment of the utility model are known to ordinary technicians in this field and will not be described in detail here.

[0089] The duct air conditioner in the utility model performs the refrigeration cycle of the duct air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat exchanged.

[0090] The compressor compresses the refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0091] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the duct air conditioner can adjust the temperature and humidity of the indoor space.

[0092] In the description of this specification, the description with reference to the terms "specific embodiment", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0093] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A duct machine, comprising: A casing, wherein the casing is formed with an air inlet and an air outlet on two sides opposite to each other; a heat exchanger, the heat exchanger being disposed in the housing and adjacent to the air outlet; An air duct member, the air duct member is arranged in the housing and located on one side of the heat exchanger; a centrifugal fan, the centrifugal fan being arranged in the air duct member, the centrifugal fan driving air to enter the housing from the air inlet, and the air flows to the heat exchanger through the air duct member, and after exchanging heat with the heat exchanger to form a heat exchange airflow, enters the room through the air outlet; It is characterized in that The centrifugal fan comprises: a first impeller, the first impeller comprising a plurality of first blades, the plurality of first blades being arranged at intervals along the circumference of the first impeller, a side of the first blade close to the central axis of the first impeller being an air inlet side, and a side of the first blade far from the central axis of the first impeller being an air outlet side; a second impeller, wherein the second impeller comprises a plurality of second blades, the plurality of second blades are arranged at intervals along the circumference of the second impeller, and the plurality of first blades and the plurality of second blades are alternately arranged along the circumference of the centrifugal fan; Wherein, along the radial direction of the first impeller, the second blade is adjacent to the air inlet side, and the width of the second blade is smaller than the width of the first blade.

2. The air duct machine according to claim 1, characterized in that: The first impeller and the second impeller are coaxially arranged, and along the radial direction of the centrifugal fan, the inner diameter of the first impeller is equal to the inner diameter of the second impeller.

3. The air duct machine according to claim 2, characterized in that: Along the radial direction of the centrifugal fan, the inner diameter of the first impeller is D1, and the outer diameter of the first impeller is D2; Wherein, the outer diameter D of the second impeller satisfies: 2D1 / 3+D2 / 3≤D≤D1 / 2+D2 / 2.

4. The air duct machine according to claim 1, characterized in that: The distance between each of the second blades and the adjacent first blade is the same.

5. The air duct machine according to claim 1, characterized in that: The centrifugal fan also includes: A fixed plate, the first impellers are multiple and arranged on opposite sides of the thickness direction of the fixed plate, and the second impellers are multiple and arranged on opposite sides of the thickness direction of the fixed plate, one end of the first blade and one end of the second blade are connected to the fixed plate.

6. The air duct machine according to claim 5, characterized in that: Along the circumferential direction of the fixed disk, the first blades of the plurality of first impellers are arranged in a staggered manner, and the second blades of the plurality of second impellers are arranged in a staggered manner.

7. The air duct machine according to claim 5, characterized in that: The first impeller further comprises: a first skirt connected to the other ends of the first blades; The second impeller further comprises: a second skirt connected to the other ends of the plurality of second blades; The side of the first skirt facing away from the fixing plate is flush with the side of the second skirt facing away from the fixing plate.

8. The air duct machine according to claim 7, characterized in that: The other end of the first blade is provided with a notch, and the notches of a plurality of the first blades define an escape portion, and the second skirt is located in the escape portion.

9. The air duct machine according to claim 1, characterized in that: Along the radial direction of the second impeller, a side of the plurality of second blades away from the central axis of the second impeller defines an outer circle, and a portion of the first impeller located within the outer circle has the same bending direction as that of the second blades.

10. A centrifugal fan, characterized in that: include: a first impeller, the first impeller comprising a plurality of first blades, the plurality of first blades being arranged at intervals along the circumference of the first impeller, a side of the first blade close to the central axis of the first impeller being an air inlet side, and a side of the first blade far from the central axis of the first impeller being an air outlet side; a second impeller, wherein the second impeller comprises a plurality of second blades, the plurality of second blades are arranged at intervals along the circumference of the second impeller, and at least one second blade is disposed between two adjacent first blades; Wherein, along the radial direction of the first impeller, the second blade is adjacent to the air inlet side or the air outlet side, and the width of the second blade is smaller than the width of the first blade.

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