Fan assembly and air duct type air conditioner with same

Abstract

The utility model discloses a fan assembly and an air pipe type air conditioner with the fan assembly, the fan assembly comprises a volute, the volute comprises a first shell and a second shell, an air duct is limited between the first shell and the second shell, and at least part of the first shell forms a volute tongue of the volute; a wind wheel; wherein a cover body is arranged on the outer side of the first shell, a first noise reduction cavity is defined between the cover body and the first shell, a first noise reduction hole is formed in the first shell, at least part of the cover body is opposite to the volute tongue, at least part of the first noise reduction cavity is defined between the cover body and the volute tongue, and at least part of the first noise reduction hole is formed in the volute tongue; the first noise reduction hole communicates with the first noise reduction cavity and the air duct. According to the fan assembly, the first noise reduction cavity communicated with the air channel is formed, so that sound waves in the air channel can enter the first noise reduction cavity through the first noise reduction holes, the sound waves resonate after entering the first noise reduction cavity, sound energy is consumed through the resonance effect, and therefore the purposes of sound absorption and noise reduction are achieved.

Description

Technical Field

[0001] This utility model relates to the field of air conditioner technology, and more specifically, to a fan assembly and a duct-type air conditioner. Background Technology

[0002] Most central air conditioning duct units in related technologies adopt centrifugal duct design. The quality of the centrifugal duct directly determines the air volume and noise index of the duct unit air conditioner, and directly affects the performance parameters of the duct unit air conditioner. At present, the room for improvement in noise reduction by simply relying on duct design is extremely limited. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a fan assembly that forms a first noise reduction cavity communicating with the air duct, allowing sound waves in the air duct to enter the first noise reduction cavity through a first noise reduction hole. After the sound waves enter the first noise reduction cavity, they will resonate, and the sound energy will be consumed through the resonance effect, thereby achieving the purpose of sound absorption and noise reduction, and improving the user experience.

[0004] This utility model also proposes a duct-type air conditioner having the aforementioned fan assembly.

[0005] A fan assembly according to a first aspect of the present invention includes: a volute, the volute comprising a first housing and a second housing, the first housing and the second housing being disposed opposite to each other and defining an air duct between them, the first housing at least partially forming a volute tongue; a fan impeller, the fan impeller being rotatably disposed in the air duct; wherein, a cover is provided on the outer side of the first housing, the cover and the first housing defining a first noise reduction cavity, the first housing being provided with a first noise reduction hole, the first noise reduction hole communicating with the first noise reduction cavity and the air duct, the cover at least partially being disposed opposite to the volute tongue to define at least a portion of the first noise reduction cavity between the cover and the volute tongue, and at least a portion of the first noise reduction hole being disposed on the volute tongue.

[0006] According to the embodiment of the present invention, the fan assembly forms a first noise reduction cavity that communicates with the air duct, allowing sound waves in the air duct to enter the first noise reduction cavity through the first noise reduction hole. After the sound waves enter the first noise reduction cavity, they will resonate, and the sound energy will be consumed through the resonance effect, thereby achieving the purpose of sound absorption and noise reduction, which can improve the user experience.

[0007] In addition, the fan assembly according to the above embodiments of the present invention may also have the following additional technical features:

[0008] According to some embodiments of the present invention, the first housing includes: a housing body extending circumferentially and axially along the impeller; a volute tongue connected to one end of the housing body extending circumferentially along the impeller; wherein, the cover extends circumferentially and axially along the impeller, and the first end of the cover extending circumferentially along the impeller is connected to the volute tongue and the second end is connected to the housing body.

[0009] According to some optional embodiments of the present invention, the volute tongue has a slot on the side opposite to the air duct, and the first end of the cover is provided with a plug-in part, which is plugged into the slot.

[0010] According to some specific embodiments of this utility model, the groove wall surface of the slot and the surface of the insertion part facing the groove wall are both arc surfaces, so that the cover can rotate relative to the shell body when the insertion part is inserted into the slot.

[0011] According to some optional embodiments of the present invention, the second end of the cover is provided with a first snap-fit ​​portion, and the outer side of the shell body is provided with a first mating portion, wherein the first snap-fit ​​portion and the first mating portion snap-fit ​​together.

[0012] According to some specific embodiments of the present invention, the first mating part itself or the first mating part and the shell body define a first slot, the first snap-fit ​​part snaps into the first slot, and the first snap-fit ​​part and / or the first mating part have a first guide surface for guiding the first snap-fit ​​part to be inserted into the first slot.

[0013] According to some optional embodiments of the present invention, the cover body is provided with second snap-fit ​​portions on opposite sides extending along the axial direction of the wind turbine, and the outer side of the shell body is provided with a second mating portion, wherein the second snap-fit ​​portion and the second mating portion snap-fit ​​together.

[0014] According to some specific embodiments of the present invention, the second mating part itself or the second mating part and the shell body define a second slot, the second snap-fit ​​part snaps into the second slot, and the second snap-fit ​​part and / or the second mating part have a second guide surface for guiding the second snap-fit ​​part to be inserted into the second slot.

[0015] According to some embodiments of the present invention, the cover and the first housing are connected together by fasteners.

[0016] According to some optional embodiments of the present invention, a mounting cavity is further defined between the cover and the first housing, the mounting cavity is separated from the first noise reduction cavity, and the mounting cavity is located in the middle region of the cover, and the fastener is at least partially located in the mounting cavity.

[0017] According to some optional embodiments of the present invention, the first housing is provided with a first connecting post on the side facing the cover and the first connecting post has a threaded hole, the cover is provided with a second connecting post on the side facing the first housing and the second connecting post has a through hole, and the fastener passes through the through hole and engages with the threaded hole.

[0018] According to some embodiments of the present invention, a partition rib is provided between the cover and the first housing to form a plurality of first noise reduction cavities between the cover and the first housing, and each first noise reduction cavity is connected to the air duct through at least one first noise reduction hole.

[0019] According to some optional embodiments of the present invention, the number of the partition ribs is multiple, and the multiple partition ribs are arranged at intervals along the circumference of the first housing; or, the number of the partition ribs is multiple, and includes at least one first rib and at least one second rib, the first rib and the second rib being arranged at an angle.

[0020] According to some optional embodiments of the present invention, one of the cover and the first shell is integrally formed with the partition rib, and the other is in a stop-fitting relationship with the partition rib.

[0021] According to some embodiments of the present invention, the number of the cover is one; or, the number of the cover is multiple and the multiple covers are arranged circumferentially on the impeller, and at least one cover is disposed close to the volute tongue.

[0022] According to a second aspect of the present invention, a ducted air conditioner is provided, comprising: a housing; a partition disposed within the housing to divide the inner cavity of the housing into a heat exchange cavity and a fan cavity, the partition defining a communication port; a heat exchanger disposed within the heat exchange cavity; and a fan assembly according to a first aspect of the present invention, the fan assembly being disposed within the fan cavity, the inlet of the air duct communicating with the fan cavity, and the outlet of the air duct communicating with the heat exchange cavity through the communication port.

[0023] According to the embodiment of the present utility model, the duct-type air conditioner utilizes the fan assembly described in the first aspect of the present utility model to form a first noise reduction cavity that communicates with the air duct. This allows sound waves in the air duct to enter the first noise reduction cavity through the first noise reduction hole. After the sound waves enter the first noise reduction cavity, they will resonate and consume sound energy through the resonance effect, thereby achieving the purpose of sound absorption and noise reduction, which helps to improve the user experience.

[0024] According to some embodiments of the present invention, the second housing has a first air duct wall, the first air duct wall is disposed opposite to the volute tongue and both are connected to the partition, and the outlet of the air duct is located between the first air duct wall and the volute tongue; wherein, the first air duct wall is adapted to define a second noise reduction cavity, the first air duct wall is provided with a second noise reduction hole, the second noise reduction hole connects the second noise reduction cavity and the air duct; and / or, the partition is adapted to define a third noise reduction cavity, the partition is provided with a third noise reduction hole, the third noise reduction hole connects the third noise reduction cavity and the connecting port, and the third noise reduction cavity is disposed close to the first air duct wall.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a structural schematic diagram of a fan assembly according to an embodiment of the present utility model;

[0028] Figure 2 This is a front view of a fan assembly according to an embodiment of the present utility model;

[0029] Figure 3 yes Figure 2 Sectional view at point AA;

[0030] Figure 4 This is an exploded view of the shell body and cover body according to an embodiment of the present utility model;

[0031] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0032] Figure 6 This is a structural schematic diagram of the shell body and cover body in one direction according to an embodiment of the present utility model;

[0033] Figure 7 This is a structural schematic diagram of the shell body and cover body according to an embodiment of the present utility model in another direction;

[0034] Figure 8 yes Figure 7 Sectional view at CC;

[0035] Figure 9 yes Figure 8 Enlarged view of point D in the middle;

[0036] Figure 10yes Figure 8 Enlarged view at point E in the middle;

[0037] Figure 11 This is a structural schematic diagram of the cover body in one direction according to an embodiment of the present utility model;

[0038] Figure 12 This is a structural schematic diagram of the cover body according to an embodiment of the present utility model in another direction;

[0039] Figure 13 This is a schematic diagram of the Helmholtz resonator.

[0040] Attached label: 1. Ductless air conditioner;

[0041] 10. Outer casing; 11. Fan cavity; 12. Heat exchange cavity;

[0042] 20. Separator; 21. Connecting port; 30. Heat exchanger;

[0043] 40. Fan assembly; 41. Volute; 4101. First housing; 4102. Second housing; 411. Air duct; 43. Volute tongue; 431. Slot; 432. First arc-shaped surface; 44. Housing body; 441. First mating part; 4411. First guide surface; 4412. First stop protrusion; 442. Second mating part; 4421. Second guide surface; 4422. Second stop protrusion; 45. First slot; 46. Second slot; 47. Fan wheel; 49. First air duct wall;

[0044] 51. First noise reduction cavity; 52. First noise reduction hole; 53. Mounting cavity; 54. First connecting post; 55. Second connecting post;

[0045] 60. Cover body; 61. Insertion part; 611. Second arc-shaped surface; 621. First convex rib; 622. Second convex rib; 65. First snap-fit ​​part; 66. Second snap-fit ​​part. Detailed Implementation

[0046] The following describes embodiments of the present invention in detail. 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0047] The fan assembly 40 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0048] like Figures 1-12 As shown, the fan assembly 40 according to an embodiment of the present invention includes a volute 41 and a fan wheel 47.

[0049] The volute 41 includes a first housing 4101 and a second housing 4102. The first housing 4101 and the second housing 4102 are arranged opposite to each other and define an air duct 411 between them. The first housing 4101 at least partially forms the volute tongue 43 of the volute 41. The impeller 47 is rotatably disposed in the air duct 411. When the impeller 47 rotates, it drives external air into the air duct 411 and flows along the air duct 411 from the outlet of the air duct 411 to a designated area.

[0050] The first housing 4101 has a cover 60 on its outer side, and the cover 60 and the first housing 4101 define a first noise reduction cavity 51. The first housing 4101 has a first noise reduction hole 52, which connects the first noise reduction cavity 51 and the air duct 411, so that the sound waves in the air duct 411 can enter the first noise reduction cavity 51 through the first noise reduction hole 52. The sound waves will resonate in the first noise reduction cavity 51 to consume the energy of the sound waves, thereby playing a noise reduction role.

[0051] Specifically, by configuring a first noise reduction cavity 51 and a first noise reduction hole 52, the flow area of ​​the first noise reduction hole 52 is smaller than that of the first noise reduction cavity 51. This allows the first noise reduction hole 52 and the first noise reduction cavity 51 to cooperate in a manner similar to a Helmholtz resonator. When air flows into the noise reduction cavity from the first noise reduction hole 52, because the flow area of ​​the first noise reduction cavity 51 is larger than that of the first noise reduction hole 52, the airflow velocity within the first noise reduction cavity 51 is much lower than the velocity of the localized airflow in the center of the first noise reduction cavity 51. This results in a relatively intense shear flow within the first noise reduction cavity 51, accompanied by unstable disturbance waves. Simultaneously, if the air column in the first noise reduction hole 52 is subjected to… When the disturbance moves into the first noise reduction cavity 51, the gas inside the first noise reduction cavity 51 is compressed, and the pressure increases. At this time, the air in the first noise reduction hole 52 is blocked from moving inward and instead moves outward. After passing the equilibrium position, it continues to move outward due to inertia, which reduces the pressure inside the first noise reduction cavity 51. This causes the air column in the first noise reduction hole 52 to stop moving outward and then move inward again. This cycle repeats. When the frequency of the disturbance wave matches the frequency of the incoming airflow, a resonance phenomenon will be formed, thereby reducing or eliminating noise and achieving the purpose of noise reduction.

[0052] Specifically, when the sound wave resonates within the first noise reduction cavity 51, the sound energy is consumed in three ways.

[0053] Firstly, when the sound wave resonates, the air column will move violently. The air column rubs against the inner wall of the first noise reduction cavity 51, causing local sound energy to be converted into heat energy, thereby consuming sound energy.

[0054] Secondly, the incident sound wave will diffuse at the first noise reduction hole 52, causing the sound wave energy to be dispersed to a wider area, thereby reducing the concentrated propagation of the sound wave and reducing the impact of noise on a specific area.

[0055] Thirdly, when the air inside the first noise reduction cavity 51 vibrates, it causes a change in the air pressure inside the first noise reduction cavity 51, thereby storing energy. This energy storage allows the Helmholtz resonator to continue vibrating for a period of time after the sound waves stop, thus extending its noise reduction time.

[0056] It should be noted that the resonant frequency of the Helmholtz resonator depends on the geometry and volume of the resonator. Therefore, the flow area of ​​the first noise reduction hole 52 and / or the flow area of ​​the first noise reduction cavity 51 can be adjusted by the noise frequency to be eliminated. In other words, the combination of the first noise reduction hole 52 and the first noise reduction cavity 51 can absorb noise of a specific frequency, thereby achieving noise reduction and reducing the noise generated by the impeller 47 during rotation to a certain extent, thus improving the user experience.

[0057] Among them, the noise frequency to be eliminated S is the cross-sectional area of ​​the first noise reduction aperture 52, S=πD 2 / 4, V is the volume of the first noise reduction cavity 51, and L is the length of the first noise reduction aperture 52 (see diagram for details). Figure 13 ).

[0058] Based on this, in a specific example, the absorption of noise of different frequencies can be achieved by adjusting the cross-sectional area of ​​the first noise reduction hole 52, the volume of the first noise reduction cavity 51, or the length of the first noise reduction hole 52.

[0059] In addition, the cover 60 is at least partially disposed opposite to the volute tongue 43, so as to define at least a portion of the first noise reduction cavity 51 between the cover 60 and the volute tongue 43, and at least a portion of the first noise reduction hole 52 is disposed on the volute tongue 43.

[0060] During operation, the impeller 47 draws air into the duct 411, pressurizes it, and then sends it out. The high-speed rotation of the impeller 47 causes the airflow to interact with the relatively stationary airflow behind it due to the viscous friction of air molecules. This creates vortex-like airflow downstream of the impeller 47. These vortices constantly change and detach. The pressure at the center of each vortex is lower than the surrounding medium pressure. When a vortex detaches, a pressure jump occurs in the turbulent airflow. These pressure jumps propagate outward through the surrounding medium and act on the impeller 47. When the pressure fluctuations in the turbulence contain audible frequency components and are sufficiently strong, noise is radiated, forming turbulent noise. Simultaneously, as the impeller 47 rotates, it sweeps across the air in adjacent locations. Due to the reciprocity of forces, the gas medium is affected by the impeller 47, generating a periodic pressure field and producing noise. When the airflow passes over the impeller 47, the boundary layers of the suction and pressure surfaces merge at its trailing edge to form a wake region. Within the wake region, the pressure and velocity of the airflow are significantly lower than in the mainstream region. When the impeller 47 rotates, the airflow in the outlet region of the duct 411 exhibits significant non-uniformity. This non-uniform potential flow field periodically acts on surrounding obstacles, producing noise similar to that produced by strumming a string on a musical instrument.

[0061] Therefore, it can be seen that when the impeller 47 rotates, a large noise will be generated in the area near the volute tongue 43 at the outlet of the air duct 411, which will define the first noise reduction cavity 51 between the cover 60 and the volute tongue 43, so that the sound waves at the volute tongue 43 can enter the first noise reduction cavity 51 through the first noise reduction hole 52. Then, when the sound waves enter the first noise reduction cavity 51, they will resonate in the first noise reduction cavity 51 to consume the energy of the sound waves, thereby playing a noise reduction role and improving the noise reduction effect.

[0062] According to the embodiment of the present invention, the fan assembly 40 forms a first noise reduction cavity 51 that communicates with the air duct 411, so that the sound waves in the air duct 411 can enter the first noise reduction cavity 51 through the first noise reduction hole 52. After the sound waves enter the first noise reduction cavity 51, they will resonate and consume sound energy through the resonance effect, thereby achieving the purpose of sound absorption and noise reduction, which can improve the user experience.

[0063] The fan assembly 40 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.

[0064] In some specific embodiments of this utility model, such as Figures 1-12 As shown, the wind turbine assembly 40 includes a volute 41 and a rotor 47.

[0065] In some embodiments of this utility model, the first housing 4101 includes a housing body 44 and a volute tongue 43. The housing body 44 extends along the circumference and axial direction of the impeller 47, and the volute tongue 43 is connected to one end of the housing body 44 that extends along the circumference of the impeller 47.

[0066] The cover 60 extends along the circumference and axial direction of the impeller 47. The first end of the cover 60 extending along the circumference of the impeller 47 is connected to the volute tongue 43, and the second end of the cover 60 is connected to the shell body 44. The position of the cover 60 is fixed from the first end and the second end of the cover 60, thereby fixing the cover 60 to the first shell 4101. This allows the cover 60 and the first shell 4101 to define a first noise reduction cavity 51, so that the sound waves in the air duct 411 can enter the first noise reduction cavity 51 through the first noise reduction hole 52, and the sound waves can resonate in the first noise reduction cavity 51, thereby consuming the energy of the sound waves and playing a noise reduction role.

[0067] In some optional embodiments of this utility model, such as Figure 4 , Figure 9 and Figure 11 As shown, the volute tongue 43 has a slot 431 on the side away from the air duct 411, and the first end of the cover 60 is provided with a plug-in part 61. The plug-in part 61 is plugged into the slot 431 to facilitate the initial placement of the cover 60 on the volute tongue 43 by using the cooperation of the plug-in part 61 and the slot 431, to position the relative position of the cover 60 and the volute tongue 43, and then to position the relative position of the cover 60 and the first housing 4101.

[0068] In some specific embodiments of this utility model, the groove wall surface of the slot 431 and the surface of the insertion part 61 facing the groove wall are both arc surfaces, so that the cover 60 can rotate relative to the shell body 44 when the insertion part 61 is inserted into the slot 431. After the insertion part 61 is inserted into the slot 431 and the position of the cover 60 is initially determined, the relative position of the cover 60 and the first shell 4101 can be adjusted by rotating the cover 60, so that the cover 60 fits against the outer wall of the first shell 4101 and the cover 60 is fixed on the first shell 4101.

[0069] Specifically, since the outer wall of the first housing 4101 is curved, and the shape of the cover 60 is adapted to the outer wall of the first housing 4101, after the insertion part 61 and the slot 431 are engaged, the cover 60 needs to be rotated toward the direction of the first housing 4101 so that the cover 60 and the outer wall of the first housing 4101 fit together.

[0070] In some embodiments, as Figure 4 , Figure 11As shown, the volute tongue 43 has a slot 431 on the side away from the air duct 411. The slot 431 has a first arc-shaped surface 432. The plug part 61 has a second arc-shaped surface 611 on the side facing the first arc-shaped surface 432. The shape of the first arc-shaped surface 432 is adapted to the shape of the second arc-shaped surface 611 so that the second arc-shaped surface 611 can rotate relative to the first arc-shaped surface 432, thereby allowing the cover 60 to rotate relative to the first housing 4101.

[0071] In some examples, such as Figure 11 As shown, the second end of the cover 60 is provided with a plurality of plug-in portions 61, which are arranged at intervals along the axial direction of the impeller. Each plug-in portion 61 has a second arc-shaped surface 611 on the side facing the first arc-shaped surface 432. Compared with forming a long strip structure on the cover 60, the second end of the cover 60 is provided with a plurality of smaller plug-in portions 61, which saves resources and reduces costs.

[0072] In some optional embodiments of this utility model, such as Figure 4 , Figure 11 As shown, the second end of the cover 60 is provided with a first snap-fit ​​portion 65, and the outer side of the shell body 44 is provided with a first mating portion 441. The first snap-fit ​​portion 65 and the first mating portion 441 snap-fit ​​together to connect the second end of the cover 60 and the shell body 44 by utilizing the cooperation of the first snap-fit ​​portion 65 and the first mating portion 441, thereby limiting the position of the cover 60 relative to the shell body 44.

[0073] In some embodiments, the volute tongue 43 has a slot 431 on the side away from the air duct 411, the outer side of the shell body 44 is provided with a first mating part 441, the first end of the cover 60 is provided with a plug-in part 61, and the second end of the cover 60 is provided with a first snap-fit ​​part 65. When the cover 60 is installed on the first shell 4101, the plug-in part 61 is first inserted into the slot 431, and then the cover 60 is rotated toward the shell body 44 so that the second end of the cover 60 is rotated toward the shell body 44 so that the first snap-fit ​​part 65 and the first mating part 441 are engaged to limit the second end of the cover 60, thereby initially fixing the cover 60 on the first shell 4101.

[0074] In some embodiments, as Figure 4 , Figure 5 As shown, the shell body 44 is provided with a plurality of first mating parts 441, which are arranged at intervals along the axial direction of the impeller 47. The second end of the cover 60 is provided with a plurality of first snap-fit ​​parts 65, which are arranged at intervals along the axial direction of the impeller 47. The plurality of first snap-fit ​​parts 65 engage with the plurality of first mating parts 441 one by one to fix the second end of the cover 60 onto the shell body 44.

[0075] In some specific embodiments of this utility model, such as Figure 4 , Figure 5 As shown, the first mating part 441 itself or the first mating part 441 and the shell body 44 define a first slot 45, and the first snap-fit ​​part 65 snaps into the first slot 45 to fix the second end of the cover 60, thereby initially fixing the cover 60 onto the first shell 4101.

[0076] The first snap-fit ​​portion 65 and / or the first mating portion 441 have a first guide surface 4411, which is used to guide the first snap-fit ​​portion 65 into the first slot 45 so that the first snap-fit ​​portion 65 and the first slot 45 can be smoothly snapped together, thereby fixing the second end of the cover 60.

[0077] In some embodiments, as Figure 5 As shown, the first mating part 441 defines a first stop protrusion 4412 on the side facing away from the shell body 44. A first slot 45 is defined between the first mating part 441 and the shell body 44. The first stop protrusion 4412 is spaced apart from the shell body 44. The first stop protrusion 4412 has a first guide surface 4411 on the side facing the cover 60. The first guide surface 4411 extends obliquely in the direction close to the shell body 44 and the cover 60. When the cover 60 is rotated, the first engaging part 65 moves towards the direction close to the first stop protrusion 4412. When rotating, the first engaging portion 65 first contacts the first guide surface 4411. Under the guidance of the first guide surface 4411, the first stop protrusion 4412 and / or the first engaging portion 65 undergo elastic deformation. After the first engaging portion 65 smoothly enters the first slot 45, the first stop protrusion 4412 and / or the first engaging portion 65 restores its deformation, and the first stop protrusion 4412 abuts against the first engaging portion 65 to limit the first engaging portion 65 within the first slot 45, thereby limiting the position of the cover 60.

[0078] In some optional embodiments of this utility model, such as Figure 4 , Figure 5 As shown, the cover 60 is provided with second snap-fit ​​portions 66 on opposite sides extending along the axial direction of the impeller 47, and the outer side of the shell body 44 is provided with a second mating portion 442. The second snap-fit ​​portions 66 and the second mating portions 442 are snap-fitted together, so that the position of the cover 60 is defined in the axial direction of the impeller 47 by utilizing the cooperation of the second snap-fit ​​portions 66 and the second mating portions 442.

[0079] In some embodiments, the volute tongue 43 has a slot 431 on the side away from the air duct 411, the outer side of the shell body 44 is provided with a second mating part 442, the first end of the cover 60 is provided with a plug-in part 61, and the cover 60 is provided with second snap-fit ​​parts 66 on opposite sides extending axially from the impeller 47. When the cover 60 is installed on the first shell 4101, the plug-in part 61 is first inserted into the slot 431, and then the cover 60 is rotated toward the shell body 44 so that the second end of the cover 60 rotates toward the shell body 44, so that the second snap-fit ​​part 66 and the second mating part 442 engage to limit the position of the cover 60 in the axial direction of the impeller 47, thereby initially fixing the cover 60 on the first shell 4101.

[0080] In some embodiments, as Figure 4 , Figure 5 As shown, the shell body 44 is provided with a plurality of second mating parts 442, which are arranged at intervals along the axial direction of the impeller 47. The second end of the cover 60 is provided with a plurality of second snap-fit ​​parts 66, which are arranged at intervals along the axial direction of the impeller 47. The plurality of second snap-fit ​​parts 66 and the plurality of second mating parts 442 engage one by one to fix the second end of the cover 60 onto the shell body 44.

[0081] In some specific embodiments of this utility model, such as Figure 5 As shown, the second mating part 442 itself or the second mating part 442 and the shell body 44 define a second slot 46, and the second snap-fit ​​part 66 snaps into the second slot 46 to limit the direction of the cover 60 in the axial direction of the impeller 47, thereby initially fixing the cover 60 on the first shell 4101.

[0082] The second snap-fit ​​portion 66 and / or the second mating portion 442 have a second guide surface 4421, which is used to guide the second snap-fit ​​portion 66 into the second slot 46 so that the second snap-fit ​​portion 66 and the second slot 46 can be smoothly snapped together, thereby limiting the direction of the cover 60 in the axial direction of the impeller 47.

[0083] In some embodiments, as Figure 5As shown, the second mating part 442 defines a second stop protrusion 4422 on the side facing away from the shell body 44. A second slot 46 is defined between the second mating part 442 and the shell body 44. The second stop protrusion 4422 is spaced apart from the shell body 44. The side of the second stop protrusion 4422 facing the cover 60 has a second guide surface 4421. The second guide surface 4421 extends obliquely in the direction close to the shell body 44 and the cover 60. When the cover 60 is rotated, the second engaging part 66 moves towards the direction close to the second stop protrusion 4422. When rotating, the second locking part 66 first contacts the second guide surface 4421. Under the guidance of the second guide surface 4421, the second stop protrusion 4422 and / or the second locking part 66 undergo elastic deformation. After the second locking part 66 smoothly enters the second slot 46, the second stop protrusion 4422 and / or the second locking part 66 restores its deformation, and the second stop protrusion 4422 abuts against the second locking part 66 to limit the second locking part 66 within the second slot 46, thereby limiting the position of the cover 60.

[0084] In some embodiments of this utility model, the cover 60 and the first housing 4101 are connected together by fasteners to fix the cover 60 on the first housing 4101, so that the cover 60 and the first housing 4101 define the first noise reduction cavity 51.

[0085] In some optional embodiments of this utility model, such as Figure 12 As shown, a mounting cavity 53 is defined between the cover 60 and the first housing 4101. The mounting cavity 53 is separated from the first noise reduction cavity 51 and is located in the middle region of the cover 60. The fasteners are at least partially located in the mounting cavity 53 to reserve space for the installation position of the fasteners, so as to facilitate the use of multiple fasteners to fix the position of the cover 60 from different positions of the cover 60, so as to firmly fix the cover 60 to the first housing 4101.

[0086] In some specific embodiments of this utility model, such as Figure 4 , Figure 12 As shown, the first housing 4101 has a first connecting post 54 on the side facing the cover 60 and the first connecting post 54 has a threaded hole. The cover 60 has a second connecting post 55 on the side facing the first housing 4101 and the second connecting post 55 has a through hole. Fasteners pass through the through hole and cooperate with the threaded hole to fix the cover 60 and the first housing 4101 together using fasteners.

[0087] In some embodiments of this utility model, such as Figure 12As shown, a partition rib is provided between the cover 60 and the first housing 4101 to form a plurality of first noise reduction cavities 51 between the cover 60 and the first housing 4101. Each first noise reduction cavity 51 is connected to the air duct 411 through at least one first noise reduction hole 52 so that the sound waves in the air duct 411 can enter the first noise reduction cavity 51 through the first noise reduction hole 52, thereby using the plurality of first noise reduction cavities 51 to achieve the effect of noise reduction.

[0088] In some embodiments, a plurality of first noise reduction cavities 51 are formed between the cover 60 and the first housing 4101. Each first noise reduction cavity 51 is connected to the air duct 411 through at least one first noise reduction hole 52. Some of the first noise reduction cavities 51 have the same volume, while some have different volumes. Some of the first noise reduction holes 52 have the same cross-sectional area, while some have different cross-sectional areas, so that the plurality of first noise reduction cavities 51 can play a noise reduction role in a wider frequency range.

[0089] In one embodiment where the first noise reduction cavity 51 is connected to the air duct 411 through multiple first noise reduction holes 52, the cross-sectional area and length of the multiple first noise reduction holes 52 connected to the same first noise reduction cavity 51 are the same.

[0090] In some optional embodiments of this utility model, there are multiple partition ribs, which are arranged at intervals along the circumference of the first housing 4101 to form multiple first noise reduction cavities 51 between the first housing 4101 and the cover 60.

[0091] In some alternative embodiments of this utility model, the number of dividing ribs is multiple, including at least one first rib 621 and at least one second rib 622. The first rib 621 and the second rib 622 are arranged at an angle to divide the space between the first housing 4101 and the cover 60 into multiple first noise reduction holes 52.

[0092] In some embodiments, as Figure 12 As shown, a plurality of first ribs 621 and a plurality of second ribs 622 are provided between the cover 60 and the first housing 4101. The first ribs 621 extend circumferentially along the volute 41, and the plurality of first ribs 621 are arranged axially along the volute 41. The second ribs 622 extend axially along the volute 41, and the plurality of second ribs 622 are arranged circumferentially along the volute 41. The first ribs 621 and the second ribs 622 divide the area between the cover 60 and the first housing 4101 into a plurality of first noise reduction cavities 51.

[0093] In some optional embodiments of this utility model, one of the cover 60 and the first shell 4101 is integrally formed with the partition rib, and the other is in a stop-fitting relationship with the partition rib, which facilitates the reduction of the number of parts and reduces costs.

[0094] In addition, by integrally molding the partition ribs with the cover 60, the structural strength of the cover 60 can be increased.

[0095] In some embodiments, as Figure 12 As shown, the cover 60 and the partition rib are integrally formed, and the first shell 4101 and the partition rib are fitted together to ensure that the first shell 4101 and the partition rib fit together and guarantee the airtightness of each first noise reduction cavity 51. Among them, the cover 60 has a smaller structure and a simpler structure than the first shell 4101, which makes it easier to form the partition rib and the cover 60 integrally, reducing the molding difficulty and production cost.

[0096] In some embodiments, the cover 60 is integrally formed with the partition rib, and the cover 60 is also provided with a second connecting post 55, wherein the end of the second connecting post 55 facing the first housing 4101 does not exceed the end of the partition rib facing the first housing 4101, so as to avoid the second connecting post 55 interfering with the stop-fitting of the partition rib and the first housing 4101, thereby ensuring the airtightness of each first noise reduction cavity 51.

[0097] In some embodiments, the first housing 4101 is provided with a first connecting post 54. When the cover 60 is fixed to the first housing 4101, the end of the first connecting post 54 facing the cover 60 is spaced apart from the cover 60 to avoid the first connecting post 54 interfering with the stop fit between the partition rib and the first housing 4101, thereby ensuring the airtightness of each first noise reduction cavity 51.

[0098] In some specific embodiments of this utility model, the first noise reduction hole 52 is provided on the first housing 4101, and the direction of the central axis of the first noise reduction hole 52 is the same as the demolding direction of the first housing 4101, so as to facilitate the forming of the first noise reduction hole 52 on the first housing 4101.

[0099] In some specific embodiments of this utility model, the first noise reduction hole 52 is parallel to the extension direction of the partition rib.

[0100] In some embodiments of this utility model, the number of cover 60 is one.

[0101] In some other embodiments of this utility model, there are multiple covers 60 arranged circumferentially around the impeller 47, and at least one cover 60 is positioned close to the volute tongue 43 to form a first noise reduction cavity 51 in at least the area close to the volute tongue 43, thereby facilitating the entry of noise at the volute tongue 43 into the first noise reduction cavity 51 through the first noise reduction hole 52.

[0102] The following describes a ducted air conditioner 1 according to an embodiment of the present invention. The ducted air conditioner 1 according to an embodiment of the present invention includes a housing 10, a partition 20, a heat exchanger 30, and a fan assembly 40 according to the above embodiment of the present invention.

[0103] A partition 20 is disposed inside the outer shell 10 to divide the inner cavity of the outer shell 10 into a heat exchange chamber 12 and a fan chamber 11. The partition 20 defines a communication port 21. The heat exchanger 30 is disposed inside the heat exchange chamber 12. The fan assembly 40 is disposed inside the fan chamber 11. The inlet of the air duct 411 is connected to the fan chamber 11, and the outlet of the air duct 411 is connected to the heat exchange chamber 12 through the communication port 21.

[0104] Driven by the impeller 47, air from outside the duct air conditioner 1 enters the fan chamber 11. The air in the fan chamber 11 enters the duct 411 through the inlet and flows along the duct 411 from the outlet to the heat exchange chamber 12. After heat exchange in the heat exchange chamber 12, the air flows into the room through the heat exchanger 30 to cool or heat the room.

[0105] According to the embodiment of the present invention, the duct-type air conditioner 1 utilizes the fan assembly 40 according to the above embodiment of the present invention to form a first noise reduction cavity 51 connected to the air duct 411. This allows sound waves in the air duct 411 to enter the first noise reduction cavity 51 through the first noise reduction hole 52. After the sound waves enter the first noise reduction cavity 51, they will resonate and consume sound energy through the resonance effect, thereby achieving the purpose of sound absorption and noise reduction, which helps to improve the user experience.

[0106] In some embodiments of this utility model, the second housing 4102 has a first air duct wall 49, which is disposed opposite to the volute tongue 43 and is connected to the partition 20. The outlet of the air duct 411 is located between the first air duct wall 49 and the volute tongue 43. The first air duct wall 49 has a guiding effect on the airflow direction so that the air in the air duct 411 can flow smoothly from the outlet to the heat exchange chamber 12 along the first air duct wall 49.

[0107] In some embodiments, the first air duct wall 49 is adapted to define a second noise reduction cavity. The first air duct wall 49 is provided with a second noise reduction hole, which connects the second noise reduction cavity and the air duct 411. The first air duct wall 49 guides the air in the air duct 411 so that sound waves can enter the second noise reduction cavity through the second noise reduction hole on the first air duct wall 49, so that the sound waves can resonate in the second noise reduction cavity, thereby consuming the energy of the sound waves and playing the role of sound absorption and noise reduction.

[0108] The principle by which the second noise reduction cavity can perform noise reduction is the same as that of the first noise reduction cavity 51 mentioned above, and will not be elaborated further here.

[0109] In some embodiments, the partition 20 is adapted to define a third noise reduction cavity. The partition 20 is provided with a third noise reduction hole, which connects the third noise reduction cavity and the connecting port 21. The third noise reduction cavity is located close to the first air duct wall 49. Noise at the connecting port 21 can enter the third noise reduction cavity through the third noise reduction hole, causing the noise to resonate in the third noise reduction cavity, thereby consuming sound energy and playing a noise reduction role.

[0110] The principle by which the third noise reduction cavity can perform noise reduction is the same as that of the first noise reduction cavity 51 mentioned above, and will not be elaborated further here.

[0111] In some specific embodiments of this utility model, the first noise reduction cavity 51, the second noise reduction cavity, and the third noise reduction cavity have the same noise reduction principle. Here, the first noise reduction cavity 51, the second noise reduction cavity, and the third noise reduction cavity are collectively referred to as noise reduction cavities, and the first noise reduction hole 52, the second noise reduction hole, and the third noise reduction hole are referred to as noise reduction holes. By designing the cross-sectional area S of a single noise reduction hole, the depth L of the noise reduction hole, and the number x of noise reduction holes connected to a single noise reduction cavity, a better noise reduction effect can be achieved.

[0112] Specifically, it is said that multiple noise reduction cavities form a complete sound absorption structure, that is, multiple first noise reduction cavities 51 form a sound absorption structure, multiple second noise reduction cavities form a sound absorption structure, and multiple third noise reduction cavities form a sound absorption structure. The acoustic impedance Z of the sound absorption structure satisfies:

[0113] Z HH The acoustic impedance Z represents the acoustic impedance of a single noise-reducing cavity, where n represents the ordinal number of the noise-reducing cavity. HH satisfy:

[0114]

[0115] The volume of the noise reduction cavity is V, the cross-sectional area of ​​a single noise reduction hole is S, and the surface area of ​​the inner side of the opening of the noise reduction cavity is S. ca The depth of the noise reduction hole is L, the number of noise reduction holes connected to a single noise reduction cavity is x, and the thickness of the volute wall is l. u .

[0116] j represents the imaginary part of the complex number, j = sqrt(-1), ρ0 is the air density, c0 is the speed of sound in the air, ω is the angular frequency of the noise, and η is the aerodynamic viscosity.

[0117] A represents the surface area of ​​the noise reduction cavity. For example, for the first noise reduction cavity 51, A is the surface area of ​​the surface of the first housing 4101 where the first noise reduction hole is located. For the second noise reduction cavity, A is the surface area of ​​the surface of the first air duct wall 49 where the second noise reduction cavity is located; for the third noise reduction cavity, A is the surface area of ​​the surface of the partition 20 where the third noise reduction cavity is located.

[0118] ρ ca c ca and k ca k represents the air density, sound velocity, and wavenumber inside the noise reduction cavity, respectively. ap Ψ va and Ψ ha denoted by , respectively, the wavenumber, viscosity term, and thermal term of the annular slit under narrow acoustic conditions; γ represents the specific heat of air; δ represents the acoustic quality correction factor; and τ represents the acoustic volume correction factor.

[0119] The vertical incident sound absorption rate α of this sound-absorbing structure can be calculated using the following formula:

[0120]

[0121] Through data simulation, it can be concluded that for a certain frequency of sound, by taking values ​​for the cross-sectional area S of a single noise reduction hole in the noise reduction cavity, the depth L of the noise reduction hole, and the number x of noise reduction holes connected to a single noise reduction cavity, a larger incident sound absorption rate α can be obtained, thereby making the noise reduction efficiency of the sound absorption structure higher.

[0122] In addition, the volume V of the noise reduction cavity, the cross-sectional area S of a single noise reduction hole, and the surface area S inside the opening of the noise reduction cavity are also considered. ca The number of noise reduction holes x connected to a single noise reduction cavity can be selected from the following range to effectively reduce noise in the 400Hz-2000Hz range.

[0123] 500mm 3 ≤V≤64000mm 3

[0124] 1.44mm 2 ≤S≤100mm 2

[0125] 100mm 2 ≤S ca ≤1600mm 2

[0126] 1≤x≤9

[0127] For the thickness of the volute wall l u The values ​​of the noise reduction hole depth L, the noise reduction cavity volume V, and the cross-sectional area S of a single noise reduction hole can follow the following formula to effectively reduce noise in the range of 400 Hz to 2000 Hz.

[0128] l u ≤L≤V / S ca *0.5

[0129] Other components and operations of the duct-type air conditioner according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0130] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0131] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0132] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0133] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0134] 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 purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A fan assembly, characterized in that, include: A volute, comprising a first housing and a second housing, the first housing and the second housing being disposed opposite to each other and defining an air outlet duct between them, the first housing at least partially forming the volute tongue of the volute; A wind turbine, which is rotatably disposed in the air duct; The first housing has a cover on its outer side, which defines a first noise reduction cavity between the cover and the first housing. The first housing has a first noise reduction hole, which connects the first noise reduction cavity and the air duct. The cover is at least partially disposed opposite to the volute tongue, thereby defining at least a portion of the first noise reduction cavity between the cover and the volute tongue. At least a portion of the first noise reduction hole is disposed on the volute tongue. The volute tongue has a slot on the side away from the air duct. The first end of the cover is provided with a plug-in portion, which is plugged into the slot.

2. The wind turbine assembly according to claim 1, characterized in that, The first housing includes: The shell body extends along the circumference and axial direction of the wind turbine; The volute tongue is connected to one end of the shell body that extends circumferentially along the impeller; The cover extends along the circumference and axial direction of the impeller, with the first end of the cover extending along the circumference of the impeller connected to the volute tongue and the second end connected to the shell body.

3. The wind turbine assembly according to claim 2, characterized in that, The slot wall surface and the insertion part facing the slot wall are both arc surfaces, so that the cover can rotate relative to the shell body when the insertion part is inserted into the slot.

4. The wind turbine assembly according to claim 2, characterized in that, The second end of the cover is provided with a first snap-fit ​​portion, and the outer side of the shell body is provided with a first mating portion, wherein the first snap-fit ​​portion and the first mating portion snap-fit ​​together.

5. The wind turbine assembly according to claim 4, characterized in that, The first mating part itself or the first mating part and the shell body define a first slot, the first snap-fit ​​part snaps into the first slot, and the first snap-fit ​​part and / or the first mating part have a first guide surface for guiding the first snap-fit ​​part to be inserted into the first slot.

6. The wind turbine assembly according to claim 2, characterized in that, The cover has a second snap-fit ​​portion on each of its opposite sides extending along the axial direction of the wind turbine, and a second mating portion is provided on the outer side of the shell body. The second snap-fit ​​portion and the second mating portion snap-fit ​​together.

7. The wind turbine assembly according to claim 6, characterized in that, The second mating part itself or the second mating part and the shell body define a second slot, the second snap-fit ​​part snaps into the second slot, and the second snap-fit ​​part and / or the second mating part have a second guide surface for guiding the second snap-fit ​​part into the second slot.

8. The wind turbine assembly according to claim 1, characterized in that, The cover and the first housing are connected together by fasteners.

9. The wind turbine assembly according to claim 8, characterized in that, A mounting cavity is further defined between the cover and the first housing. The mounting cavity is separated from the first noise reduction cavity and is located in the middle region of the cover. The fastener is at least partially located in the mounting cavity.

10. The wind turbine assembly according to claim 8, characterized in that, The first housing has a first connecting post on the side facing the cover and the first connecting post has a threaded hole. The cover has a second connecting post on the side facing the first housing and the second connecting post has a through hole. The fastener passes through the through hole and engages with the threaded hole.

11. The wind turbine assembly according to claim 1, characterized in that, A partition rib is provided between the cover and the first housing to form a plurality of first noise reduction cavities between the cover and the first housing, and each first noise reduction cavity is connected to the air duct through at least one first noise reduction hole.

12. The wind turbine assembly according to claim 11, characterized in that, The number of the partition ribs is multiple, and the multiple partition ribs are arranged at intervals along the circumference of the first shell; Alternatively, the number of the dividing ribs may be multiple, including at least one first rib and at least one second rib, wherein the first rib and the second rib are arranged at an angle.

13. The wind turbine assembly according to claim 11, characterized in that, One of the cover and the first shell is integrally formed with the partition rib, and the other is in a stop-fitting relationship with the partition rib.

14. The wind turbine assembly according to any one of claims 1-13, characterized in that, The number of the cover is one; or, the number of the cover is multiple and the multiple covers are arranged circumferentially on the wind turbine, with at least one cover positioned close to the volute tongue.

15. A ducted air conditioner, characterized in that, include: shell; A partition, disposed within the housing, divides the inner cavity of the housing into a heat exchange chamber and a fan chamber, the partition defining a communication opening; A heat exchanger, wherein the heat exchanger is disposed within the heat exchange chamber; A fan assembly, wherein the fan assembly is the fan assembly according to any one of claims 1-14, the fan assembly is disposed in the fan cavity, the inlet of the air duct is connected to the fan cavity, and the outlet of the air duct is connected to the heat exchange cavity through the connecting port.

16. The ducted air conditioner according to claim 15, characterized in that, The second housing has a first air duct wall, which is disposed opposite to the volute tongue and is connected to the partition. The outlet of the air duct is located between the first air duct wall and the volute tongue. Wherein, the first air duct wall is adapted to define the second noise reduction cavity, and the first air duct wall is provided with a second noise reduction hole, the second noise reduction hole connecting the second noise reduction cavity and the air duct; And / or, the partition is adapted to define a third noise reduction cavity, the partition is provided with a third noise reduction hole, the third noise reduction hole connects the third noise reduction cavity and the connecting port, and the third noise reduction cavity is disposed close to the first air duct wall.

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