Fan assembly and air duct type air conditioner with same

Abstract

The utility model discloses a fan assembly and an air duct type air conditioner with the fan assembly, and the fan assembly comprises a volute, an air duct and a fan, the wind wheel is rotatably arranged in the air duct; wherein the shell wall of the volute defines a first noise reduction cavity, the first noise reduction cavity is in a long strip shape, the first noise reduction cavity communicates with the air channel through a first noise reduction hole, and the first noise reduction hole is located in the end, in the length direction, of the first noise reduction cavity. According to the fan assembly, the long-strip-shaped first noise reduction cavity is defined, and the first noise reduction cavity is communicated with the air duct through the first noise reduction hole located in the end portion of the first noise reduction cavity in the length direction, so that sound waves can be emitted at the closed end of the first noise reduction cavity after entering the first noise reduction cavity through the first noise reduction hole; due to the fact that the reflected waves interfere with the incident waves, a part of the reflected waves and a part of the incident waves are counteracted with each other, and the silencing effect is 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 invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a fan assembly that defines an elongated first noise reduction cavity, which is connected to a duct via a first noise reduction hole located at its longitudinal end. This allows sound waves to enter the first noise reduction cavity through the first noise reduction hole and be emitted at the closed end of the cavity. Due to the interference between the reflected and incident waves, a portion of the reflected wave cancels out a portion of the incident wave, achieving a noise reduction effect.

[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 defining an air duct; and a fan impeller rotatably disposed in the air duct. The volute wall defines a first noise reduction cavity, which is elongated and communicates with the air duct via a first noise reduction hole located at one end of the first noise reduction cavity along its length.

[0006] According to the embodiment of the present invention, the fan assembly defines a long strip-shaped first noise reduction cavity, and the first noise reduction cavity is connected to the air duct through a first noise reduction hole located at the end of its length direction. After the sound wave enters the first noise reduction cavity through the first noise reduction hole, it can be emitted at the closed end of the first noise reduction cavity. Since the reflected wave interferes with the incident wave, part of the reflected wave and part of the incident wave cancel each other out, thereby achieving the effect of noise reduction.

[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 noise reduction cavity is connected to the air duct through a first noise reduction hole; or, the first noise reduction cavity is connected to the air duct through multiple first noise reduction holes and the multiple first noise reduction holes are arranged in the width direction of the first noise reduction cavity.

[0009] According to some embodiments of the present invention, the first end of the first noise reduction hole is connected to the first noise reduction cavity and the second end is connected to the air duct. The airflow direction in the air duct near the second end is set at an obtuse angle to the center line of the first noise reduction hole extending from the second end to the first end.

[0010] According to some embodiments of the present invention, the length of the first noise reduction cavity is 0.2-0.3 times the wavelength of the sound wave with a preset frequency.

[0011] According to some optional embodiments of the present invention, the length of the first noise reduction cavity is one-quarter of the wavelength of the sound wave with a preset frequency, and the first noise reduction cavity is constructed as a quarter-wavelength tube structure.

[0012] According to some embodiments of this utility model, the length of the first noise reduction cavity is 3cm-13cm.

[0013] According to some embodiments of the present invention, the width of the first noise reduction cavity is 4mm-12mm; and / or, the dimension of the first noise reduction cavity in the wall thickness direction of the volute is 4mm-12mm.

[0014] According to some embodiments of the present invention, the length direction of the first noise reduction cavity extends along the circumference of the volute, and the width direction extends along the axial direction of the volute.

[0015] According to some optional embodiments of the present invention, the number of the first noise reduction cavities is multiple, and the multiple first noise reduction cavities are arranged in the axial and / or circumferential directions of the volute.

[0016] According to some specific embodiments of the present invention, the plurality of first noise reduction cavities are divided into a plurality of noise reduction groups, the plurality of noise reduction groups are arranged axially on the volute, the plurality of first noise reduction cavities in each noise reduction group are arranged circumferentially on the volute, and the plurality of first noise reduction cavities in two adjacent noise reduction groups are staggered.

[0017] According to some optional embodiments of the present invention, the volute includes a first shell and a second shell formed separately, the first shell and the second shell are disposed opposite to each other and define the air duct between them, and the first noise reduction cavity and the first noise reduction hole are provided on the first shell and / or the second shell.

[0018] According to some specific embodiments of the present invention, the volute includes a first air duct wall and a volute tongue disposed opposite to each other, the outlet of the air duct is located between the first air duct wall and the volute tongue, the first air duct wall is located in the first housing, and the volute tongue is located in the second housing; wherein, the first noise reduction cavity and the first noise reduction hole are disposed in the first housing, the first noise reduction hole disposed on the first housing is located at the end of the first noise reduction cavity near the first air duct wall, and extends obliquely into the air duct in the circumferential direction of the impeller along the direction near the first air duct wall; and / or, the first noise reduction cavity and the first noise reduction hole are disposed in the second housing, the first noise reduction hole disposed on the second housing is located at the end of the first noise reduction cavity away from the volute tongue, and extends obliquely into the air duct in the circumferential direction of the impeller along the direction near the volute tongue.

[0019] According to some specific embodiments of the present invention, at least one of the first housing and the second housing includes: a housing body; a cover body disposed on the outside of the housing body; and a partition rib disposed between the housing body and the cover body to define a plurality of first noise reduction cavities between the housing body and the cover body, and a plurality of first noise reduction holes disposed on the housing body.

[0020] In some embodiments, one of the shell body and the cover body is integrally formed with the partition rib, and the other is in a stop-fitting relationship with the partition rib.

[0021] 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.

[0022] According to the embodiment of the present invention, the duct-type air conditioner utilizes the fan assembly described in the first aspect of the present invention. By defining a long strip-shaped first noise reduction cavity, and the first noise reduction cavity being connected to the air duct through a first noise reduction hole located at the end of its length direction, sound waves can be emitted at the closed end of the first noise reduction cavity after entering the first noise reduction cavity through the first noise reduction hole. Due to the interference between the reflected wave and the incident wave, a portion of the reflected wave and a portion of the incident wave cancel each other out, thereby achieving the effect of noise reduction.

[0023] In some embodiments of this utility model, the separator is adapted to define a second noise reduction cavity, and the separator is provided with a second noise reduction hole, the second noise reduction hole connecting the second noise reduction cavity and the connecting port.

[0024] In some optional embodiments of this utility model, the volute includes a first air duct wall and a volute tongue disposed opposite to each other, the outlet of the air duct is located between the first air duct wall and the volute tongue, and the second noise reduction cavity and the second noise reduction hole are disposed on the separator near 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 schematic diagram of the fan assembly and separator in one direction according to an embodiment of the present utility model;

[0028] Figure 2 This is a structural schematic diagram of the separator of the fan assembly according to an embodiment of the present utility model in another direction;

[0029] Figure 3 This is a top view of the partition of the fan assembly according to an embodiment of the present utility model;

[0030] Figure 4 yes Figure 3 Sectional view at point AA;

[0031] Figure 5 This is a structural schematic diagram of the separator of the fan assembly according to an embodiment of the present utility model in one direction, in which the cover is not shown in the figure;

[0032] Figure 6 yes Figure 5 Enlarged view of point C in the middle;

[0033] Figure 7 This is a structural schematic diagram of the separator of the fan assembly according to an embodiment of the present utility model in another direction, in which the cover is not shown in the figure;

[0034] Figure 8 This is a top view of the partition of the fan assembly according to an embodiment of the present utility model, in which the cover is not shown;

[0035] Figure 9 yes Figure 8 Sectional view at point BB;

[0036] Figure 10 This is a schematic diagram of the Helmholtz resonator principle;

[0037] Figure 11 This is a structural schematic diagram of a duct-type air conditioner according to an embodiment of the present utility model;

[0038] Figure 12 This is a cross-sectional view of a duct-type air conditioner according to an embodiment of the present utility model.

[0039] Attached label: 1. Ductless air conditioner;

[0040] 10. Outer casing; 11. Fan cavity; 12. Heat exchange cavity;

[0041] 20. Separator; 21. Connecting port; 30. Heat exchanger

[0042] 40. Fan assembly; 41. Volute; 4101. First housing; 4102. Second housing; 411. Air duct; 412. Inlet; 413. Outlet; 421. Volute tongue; 422. First air duct wall; 45. Impeller; 481. Shell body; 482. Cover; 49. Separating rib; 491. First separating rib; 492. Second separating rib;

[0043] 50. Noise reduction group; 51. First noise reduction cavity; 52. First noise reduction hole. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0045] The fan assembly 40 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0046] like Figures 1-9 As shown, the fan assembly 40 according to an embodiment of the present invention includes a volute 41 and a fan wheel 45.

[0047] The volute 41 defines an air duct 411, and the impeller 45 is rotatably disposed in the air duct 411. The shell wall of the volute 41 defines a first noise reduction cavity 51, which is elongated. The first noise reduction cavity 51 and the air duct 411 are connected through a first noise reduction hole 52. The first noise reduction hole 52 is located at one end of the first noise reduction cavity 51 along its length, so that one end of the first noise reduction cavity 51 is open and the other end is closed. After the sound wave enters the first noise reduction cavity 51 through the first noise reduction hole 52, it is emitted at the closed end of the first noise reduction cavity 51. Due to the interference between the reflected wave and the incident wave, part of the reflected wave and part of the incident wave cancel each other out, thus achieving the effect of noise reduction.

[0048] Meanwhile, for a specific frequency of sound, after the sound wave enters the first noise reduction cavity 51 through the first noise reduction hole 52, it will resonate in the first noise reduction cavity 51 to consume the energy of the sound wave, thereby achieving the noise reduction effect.

[0049] Specifically, when certain conditions are met, a standing wave will be formed in the first noise reduction cavity 51. At this time, the sound pressure at the opening end of the first noise reduction cavity 51 is the minimum, almost zero. This phenomenon is called resonance.

[0050] According to the embodiment of the present invention, the fan assembly 40 defines an elongated first noise reduction cavity 51, and the first noise reduction cavity 51 is connected to the air duct 411 through a first noise reduction hole 52 located at the end of its length direction. After the sound wave enters the first noise reduction cavity 51 through the first noise reduction hole 52, it can be emitted at the closed end of the first noise reduction cavity 51. Since the reflected wave interferes with the incident wave, part of the reflected wave and part of the incident wave cancel each other out, thus achieving the effect of noise reduction.

[0051] The fan assembly 40 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.

[0052] In some specific embodiments of this utility model, such as Figures 1-9 As shown, the wind turbine assembly 40 includes a volute 41 and a rotor 45.

[0053] In some embodiments of this utility model, the first noise reduction cavity 51 and the air duct 411 are connected through a first noise reduction hole 52, so that sound waves 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 through the first noise reduction hole 52, they are emitted at the closed end of the first noise reduction cavity 51. The reflected wave interferes with the incident wave, so that part of the reflected wave and part of the incident wave cancel each other out, thereby achieving the effect of noise reduction.

[0054] In some embodiments of this utility model, such as Figure 5 , Figure 6As shown, the first noise reduction cavity 51 is connected to the air duct 411 through multiple first noise reduction holes 52. The multiple first noise reduction holes 52 are arranged in the width direction of the first noise reduction cavity 51 so that sound waves can enter the first noise reduction cavity 51 through the multiple first noise reduction holes 52, so that the sound waves can be emitted at the closed end of the first noise reduction cavity 51. The reflected wave interferes with the incident wave, so that part of the reflected wave and part of the incident wave cancel each other out, thereby achieving the effect of noise reduction.

[0055] Specifically, the number of holes through which a first noise reduction cavity 51 is connected to the air duct 411 depends on its application scenario and design requirements, in order to achieve specific electromagnetic wave propagation characteristics or mechanical performance.

[0056] Specifically, the number of first noise reduction holes 52 may affect the propagation efficiency of the wave. Therefore, the size and number of the first noise reduction holes 52 need to be adapted to the length of the sound wave so that the sound wave can pass through the first noise reduction holes 52 into the first noise reduction cavity 51 and form the required resonance or reflection in the first noise reduction cavity 51 to achieve the purpose of noise reduction.

[0057] In some embodiments, as Figure 6 As shown, each first noise reduction cavity 51 is connected to the air duct 411 through two first noise reduction holes 52. These two first noise reduction holes 52 are spaced apart to avoid the aperture of the air duct 411 and the first noise reduction cavity 51 being too large, which would affect the airflow in the air duct 411.

[0058] In some embodiments of this utility model, the first end of the first noise reduction hole 52 is connected to the first noise reduction cavity 51 and the second end is connected to the air duct 411. The airflow direction near the second end in the air duct 411 is set at an obtuse angle to the center line of the first noise reduction hole 52 extending from the second end to the first end, so as to reduce the influence of the first noise reduction hole 52 on the airflow in the air duct 411 and ensure the flow rate and flow volume of the airflow in the air duct 411.

[0059] In some embodiments, as Figure 4 As shown, the angle between the airflow direction near the second end inside the air duct 411 and the center line of the first noise reduction hole 52 extending from the second end to the first end is θ, where 110°≤θ≤150°.

[0060] Specifically, the angle θ between the airflow direction near the second end inside the air duct 411 and the center line extending from the second end to the first end of the first noise reduction hole 52 can be 110°, 115°, 120°, 125°, 130°, 135°, 139°, 140°, 145° or 150°, without much restriction here.

[0061] In some embodiments of this utility model, the length of the first noise reduction cavity 51 is 0.2-0.3 times the wavelength of the sound wave with a preset frequency. That is to say, the length of the first noise reduction cavity 51 is close to one-quarter of the wavelength of the sound wave with a preset frequency, thereby enabling the first noise reduction cavity 51 to define a quarter-wavelength tube structure, and thus using the quarter-wavelength tube structure to play a noise reduction role.

[0062] In some examples, the length of the first noise reduction cavity 51 is 0.2 to 0.25 times the wavelength of the sound wave with a preset frequency. Specifically, the length of the first noise reduction cavity 51 can be 0.2, 0.21, 0.22, 0.23, 0.24, or 0.25 times the preset wavelength of the sound wave. No further restrictions are imposed here.

[0063] In some embodiments, wavelength λ = v / f, where v is the wave speed, v ≈ 340 m / s. The wavelength is different for different frequencies of sound. For example, the wavelength of a 700 Hz sound is about 48 cm, and the wavelength of a 1700 Hz sound is about 20 cm.

[0064] For a sound at a frequency of 700 Hz, the length of the first noise reduction cavity 51 can be 9.6 cm to 12 cm to achieve noise reduction for the sound at a frequency of 700 Hz.

[0065] For a 1700Hz sound, the length of the first noise reduction cavity 51 can be 4cm-5cm to achieve noise reduction for the 1700Hz sound.

[0066] In some optional embodiments of this utility model, the length of the first noise reduction cavity 51 is one-quarter of the wavelength of the sound wave with a preset frequency, and the first noise reduction cavity 51 is constructed as a quarter-wavelength tube structure to achieve noise reduction by utilizing the quarter-wavelength tube structure.

[0067] Specifically, after the sound wave enters the first noise reduction cavity 51 through the first noise reduction hole 52, it is emitted at the closed end of the first noise reduction cavity 51. Due to the interference between the reflected wave and the incident wave, part of the reflected wave and part of the incident wave cancel each other out, thus achieving the effect of noise reduction.

[0068] Meanwhile, for a specific frequency of sound, after the sound wave enters the first noise reduction cavity 51 through the first noise reduction hole 52, it will resonate in the first noise reduction cavity 51 to consume the energy of the sound wave, thereby achieving the noise reduction effect.

[0069] Specifically, when certain conditions are met, a standing wave will be formed in the first noise reduction cavity 51. At this time, the sound pressure at the opening end of the first noise reduction cavity 51 is the minimum, almost zero. This phenomenon is called resonance.

[0070] In some embodiments of this utility model, the length of the first noise reduction cavity 51 is 3cm-13cm, so as to reduce noise of at least 700hz-1700hz, thereby reducing the noise transmitted from the fan assembly 40 to the user and improving the user experience.

[0071] In some embodiments, the shell wall of the volute 41 defines a plurality of first noise reduction cavities 51. The lengths of the plurality of first noise reduction cavities 51 are partially the same and partially different, so that the plurality of first noise reduction cavities 51 can be used to reduce noise for sounds of different frequencies, thereby enabling noise reduction for sounds in a wider frequency range and improving the noise reduction effect.

[0072] In some embodiments of this utility model, the width of the first noise reduction cavity 51 is 4mm-12mm. Specifically, the width of the first noise reduction cavity 51 can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm or 12mm, and no further restrictions are imposed here.

[0073] In some embodiments of this utility model, the dimension of the first noise reduction cavity 51 in the wall thickness direction of the volute 41 is 4mm-12mm. Specifically, the dimension of the first noise reduction cavity 51 in the wall thickness direction of the volute 41 can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm or 12mm, and no further restrictions are imposed here.

[0074] The size of the first noise reduction cavity 51 on the volute 41 mainly depends on the size of the volute 41. Thus, the first noise reduction cavity 51 is directly formed on the volute 41. The first noise reduction cavity 51 is constructed as a quarter-wavelength tube. The quarter-wavelength tube on the volute 41 plays a noise reduction role. This will not affect the basic size of the volute 41, and thus it is convenient to reduce noise without increasing the size of the fan assembly 40.

[0075] In some embodiments, the noise in the air duct 411 can be reduced by about 2 dB by using the first noise reduction cavity 51 to reduce the noise without affecting the basic structural dimensions of the fan assembly.

[0076] In some embodiments of the present invention, Figure 5 , Figure 6 As shown, the length of the first noise reduction cavity 51 extends along the circumference of the volute 41, and the width extends along the axial direction of the volute 41, so that the extension direction of the length of the first noise reduction cavity 51 matches the airflow direction in the air duct 411, thereby allowing the sound waves in the air duct 411 to smoothly pass through the first noise reduction hole 52 and enter the first noise reduction cavity 51, so as to use the first noise reduction cavity 51 to reduce noise.

[0077] In some optional embodiments of this utility model, such as Figure 5 As shown, there are multiple first noise reduction cavities 51, which are arranged axially and / or circumferentially in the volute 41 to reduce the noise of sound waves in the air duct 411, thereby significantly reducing the noise transmitted from the fan assembly 40 to the user and improving the user experience.

[0078] In some embodiments, the lengths of the plurality of first noise reduction cavities 51 are partially the same and partially different, so that the plurality of first noise reduction cavities 51 can be used to reduce noise for sounds of different frequencies, thereby enabling noise reduction for sounds over a wider frequency range and improving the noise reduction effect.

[0079] In some specific embodiments of this utility model, such as Figure 8 As shown, the multiple first noise reduction cavities 51 are divided into multiple noise reduction groups 50. The multiple noise reduction groups 50 are arranged axially in the volute 41. The multiple first noise reduction cavities 51 in each noise reduction group 50 are arranged circumferentially in the volute 41, and the multiple first noise reduction cavities 51 in two adjacent noise reduction groups 50 are staggered to facilitate flexible setting of the length of the first noise reduction cavity 51, thereby enabling noise reduction of different frequencies of sound and improving the noise reduction effect.

[0080] In addition, the multiple first noise reduction holes 52 of two adjacent first noise reduction groups 50 are staggered so that sound waves from different areas in the air duct 411 can enter the first noise reduction cavity 51 through the corresponding first noise reduction hole 52, thereby using multiple first noise reduction cavities 51 to fully reduce the noise in the air duct 411 and improve the noise reduction effect.

[0081] In some optional embodiments of this utility model, such as Figure 1 As shown, the volute 41 includes a first shell 4101 and a second shell 4102 formed separately. The first shell 4101 and the second shell 4102 are arranged opposite to each other and define an air duct 411 between them, so as to facilitate the placement of the impeller 45 in the air duct 411 and reduce the assembly difficulty.

[0082] The first housing 4101 and / or the second housing 4102 are provided with a first noise reduction cavity 51 and a first noise reduction hole 52, so as to make full use of the space on the volute 41 to set up more first noise reduction cavities 51, and then use multiple first noise reduction cavities 51 to play a noise reduction role for different frequencies of sound, so as to achieve a better noise reduction effect.

[0083] In some specific embodiments of this utility model, such as Figure 4As shown, the volute 41 includes a first air duct wall 422 and a volute tongue 421 disposed opposite to each other. The outlet 413 of the air duct 411 is located between the first air duct wall 422 and the volute tongue 421. The first air duct wall 422 is located in the first housing 4101, and the volute tongue 421 is located in the second housing 4102. Driven by the impeller 45, the gas in the air duct 411 flows along the circumference of the volute 41 towards the outlet 413 to guide the air to a designated area.

[0084] In some embodiments, the first noise reduction cavity 51 and the first noise reduction hole 52 are disposed on the first housing 4101. The first noise reduction hole 52 disposed on the first housing 4101 is located at one end of the first noise reduction cavity 51 near the first air duct wall 422, and extends obliquely into the air duct 411 in the circumferential direction of the impeller 45 along the direction near the first air duct wall 422, so that the first noise reduction hole 52 on the first housing 4101 is a leeward hole, thereby reducing the airflow entering the first noise reduction cavity 51 from the first noise reduction hole 52, and avoiding excessive impact on the flow rate and flow volume of the airflow in the air duct 411.

[0085] In some embodiments, the first noise reduction cavity 51 and the first noise reduction hole 52 are disposed on the second housing 4102. The first noise reduction hole 52 disposed on the second housing 4102 is located at the end of the first noise reduction cavity 51 away from the volute tongue 421, and extends obliquely into the air duct 411 in the circumferential direction of the impeller 45 along the direction close to the volute tongue 421, so that the first noise reduction hole 52 on the second housing 4102 is a leeward hole, thereby reducing the airflow entering the first noise reduction cavity 51 from the first noise reduction hole 52, and avoiding excessive impact on the flow rate and flow volume of the airflow in the air duct 411.

[0086] In some specific embodiments of this utility model, such as Figure 5 , Figure 6 As shown, at least one of the first housing 4101 and the second housing 4102 includes a housing body 481, a cover 482 and a partition rib 49. The cover 482 is located on the outside of the housing body 481 to close the opening of the housing body 481, which makes it easier to reduce the difficulty of forming the first noise reduction cavity 51.

[0087] Specifically, it is difficult to integrally form a cavity with a small through hole. Therefore, the shell body 481 and the cover body 482 are formed separately, which makes it easier to reduce the difficulty of generating the first noise reduction cavity 51 and reduce production costs.

[0088] Among them, the partition rib 49 is provided between the shell body 481 and the cover 482 to define a plurality of first noise reduction cavities 51 between the shell body 481 and the cover 482, and a plurality of first noise reduction holes 52 are provided on the shell body 481 so that the sound in the air duct 411 can enter the first noise reduction cavity 51 through the first noise reduction holes 52, thereby playing the role of noise reduction in the air duct 411.

[0089] In some embodiments, a plurality of first partition ribs 491 and a plurality of second partition ribs 492 are included. The first partition ribs 491 extend circumferentially along the volute 41, and the plurality of first partition ribs 491 are arranged axially along the volute 41. The second partition ribs 492 extend axially along the volute 41, and the plurality of second partition ribs 492 are arranged circumferentially along the volute 41, so as to divide the shell body 481 and the cover body 482 into a plurality of first noise reduction cavities 51, thereby using the plurality of first noise reduction cavities 51 to reduce noise in a wider frequency range and improve the noise reduction effect.

[0090] Among them, two adjacent first partition ribs 491 define two opposite sidewalls of the first noise reduction cavity 51 in the axial direction of the volute 41, and two adjacent second partition ribs 492 define two opposite sidewalls of the first noise reduction cavity 51 in the circumferential direction.

[0091] In some embodiments, the shell body 481 and the partition rib 49 are integrally formed, and the cover body 482 and the partition rib 49 are mutually abutting. This eliminates the need for a connecting structure between the shell body 481 and the partition rib 49, thereby reducing the complexity of the structure and lowering production costs.

[0092] In other embodiments, the cover 482 and the partition rib 49 are integrally formed, and the shell body 481 and the partition rib 49 are mutually abutting. This eliminates the need for a connecting structure between the cover 482 and the partition rib 49, thereby reducing the complexity of the structure and lowering production costs.

[0093] 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.

[0094] 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, and the fan assembly 40 is disposed inside the fan chamber 11. The inlet 412 of the air duct 411 is connected to the fan chamber 11, and the outlet 413 of the air duct 411 is connected to the heat exchange chamber 12 through the communication port 21.

[0095] Driven by the impeller 45, the air outside the duct air conditioner 1 enters the fan cavity 11. The air in the fan cavity 11 enters the air duct 411 through the inlet 412 and flows from the air outlet of the air duct 411 to the heat exchange cavity 12. After the air is heated by the heat exchanger 30 in the heat exchange cavity 12, it flows from the air outlet to the room to cool or heat the room.

[0096] In some embodiments, as Figure 1 As shown, the impeller 45 is a centrifugal impeller 45, and the inlet 412 of the air duct 411 is located on one side of the volute 41 in the axial direction.

[0097] 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 define an elongated first noise reduction cavity 51. The first noise reduction cavity 51 is connected to the air duct 411 through a first noise reduction hole 52 located at its length end. After the sound wave enters the first noise reduction cavity 51 through the first noise reduction hole 52, it can be emitted at the closed end of the first noise reduction cavity 51. Since the reflected wave interferes with the incident wave, part of the reflected wave cancels out part of the incident wave, thus achieving the effect of noise reduction.

[0098] In some embodiments of this utility model, the separator 20 is adapted to define a second noise reduction cavity. The separator 20 is provided with a second noise reduction hole, which connects the second noise reduction cavity and the connecting port 21. Noise at the connecting port 21 can enter the second noise reduction cavity through the second noise reduction hole, causing the noise to resonate in the second noise reduction cavity, thereby consuming sound energy and playing a noise reduction role.

[0099] The flow area of ​​the second noise reduction hole is smaller than that of the second noise reduction cavity. The second noise reduction hole and the second noise reduction cavity are designed to work together to form a Helmholtz resonator-like structure. When air flows from the second noise reduction hole into the second noise reduction cavity through the connecting port 21, the flow area of ​​the second noise reduction cavity is larger than that of the second noise reduction hole. This results in the airflow velocity within the second noise reduction cavity being much lower than the velocity of the local airflow in the center of the second noise reduction cavity. Consequently, a relatively intense shear flow is formed within the second noise reduction cavity, accompanied by unstable disturbance waves. Simultaneously, if the air column in the second noise reduction hole is disturbed and moves into the second noise reduction cavity, the gas inside the second noise reduction cavity is compressed, increasing the pressure. At this point, the inward movement of the air in the second noise reduction hole is obstructed, and it moves outward instead. After passing the equilibrium position, it continues to move outward due to inertia, causing the pressure inside the second noise reduction cavity to decrease. This causes the air column in the second noise reduction hole to stop moving outward and then move inward again. This cycle repeats until the frequency of the disturbance wave matches the frequency of the incoming airflow, which creates a resonance phenomenon. This dissipates sound energy, thereby reducing or eliminating noise and achieving the purpose of noise reduction.

[0100] It should be noted that the resonant frequency of a Helmholtz resonator depends on its geometry and volume. Therefore, the flow area of ​​the second noise reduction aperture and / or the flow area of ​​the second noise reduction cavity can be adjusted by the noise frequency to be eliminated. In other words, the combination of the second noise reduction aperture and the second noise reduction cavity can absorb noise of a specific frequency, achieving noise reduction and reducing the noise generated by the impeller 45 during rotation to a certain extent, thus improving the user experience.

[0101] Specifically, the noise frequency to be eliminated S is the cross-sectional area of ​​the second noise reduction aperture, S = πD 2 / 4, V is the volume of the second noise reduction cavity, and L is the length of the second noise reduction aperture (see diagram for details). Figure 10 ).

[0102] Based on this, in specific examples, noise reduction of different frequencies can be achieved by adjusting the cross-sectional area of ​​the second noise reduction hole, the volume of the second noise reduction cavity, or the length of the second noise reduction hole.

[0103] In some optional embodiments of this utility model, such as Figure 4 As shown, the volute 41 includes a first air duct wall 422 and a volute tongue 421 disposed opposite to each other. The outlet 413 of the air duct 411 is located between the first air duct wall 422 and the volute tongue 421. The second noise reduction cavity and the second noise reduction hole are disposed on the separator 20 near the first air duct wall 422, so that the second noise reduction hole connects the second noise reduction cavity and the connecting port 21, thereby allowing noise at the connecting port 21 to enter the second noise reduction cavity through the second noise reduction hole.

[0104] The first air duct wall 422 guides the airflow direction. The second noise reduction cavity and the second noise reduction hole are located near the first air duct wall 422 on the separator 20 so that the second noise reduction hole and the second noise reduction cavity are in the direction of airflow, thereby allowing noise to enter the second noise reduction cavity through the second noise reduction hole and improving the noise reduction efficiency.

[0105] In some embodiments, at least one second noise reduction cavity is located on the side of the separator 20 opposite to the communication port 21.

[0106] In some embodiments, at least one part of the second noise reduction cavity is located on the side of the separator 20 away from the communication port 21 and another part is located on the side of the first air duct wall 422 away from the air duct 411, so as to define a larger volume of the second noise reduction cavity using a limited space, so as to use multiple second noise reduction cavities to reduce noise in a wider frequency range, thereby achieving a better noise reduction effect.

[0107] In some specific embodiments of this utility model, multiple second noise reduction cavities form a complete sound absorption structure, and the acoustic impedance Z of the sound absorption structure satisfies:

[0108] where Z HH Let Z represent the acoustic impedance of a single second noise reduction cavity, and n represent the ordinal number of the second noise reduction cavity. HH satisfy:

[0109]

[0110] The volume of the second noise reduction cavity is V, the cross-sectional area of ​​a single second noise reduction hole is S, and the surface area of ​​the inner side of the opening of the second noise reduction cavity is S. caThe depth of the second noise reduction hole is L, the number of second noise reduction holes connected to a single second noise reduction cavity is x, and the thickness of the volute wall is l. u .

[0111] 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 noise angular frequency, η is the aerodynamic viscosity, and A is the surface area of ​​the second noise reduction cavity surface of the separator 20.

[0112] 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.

[0113] The vertical incident sound absorption rate α of this sound-absorbing structure can be calculated using the following formula:

[0114]

[0115] Through data simulation, it can be concluded that for a certain frequency of sound, by taking values ​​for the cross-sectional area S of the second noise reduction hole, the depth L of the second noise reduction hole, and the number x of the second noise reduction holes connected to a single second 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.

[0116] Furthermore, regarding the volume V of the second noise reduction cavity, the cross-sectional area S of the second noise reduction aperture, and the surface area S of the inner side of the opening of the second noise reduction cavity... ca The number of second noise reduction holes x connected to a single second noise reduction cavity can be taken from the following range to effectively reduce noise in the range of 400 Hz to 2000 Hz.

[0117] 500mm 3 ≤V≤64000mm 3

[0118] 1.44mm 2 ≤S≤100mm 2

[0119] 100mm 2 ≤S ca ≤1600mm 2

[0120] 1≤x≤9

[0121] For the wall thickness of the volute 41 l uThe values ​​of the depth L of the second noise reduction hole, the volume V of the second noise reduction cavity, and the cross-sectional area S of the second noise reduction hole can follow the following formula to effectively reduce noise in the range of 400 Hz to 2000 Hz.

[0122] l u ≤L≤V / S ca *0.5

[0123] In some optional embodiments of this utility model, such as Figures 2-4 As shown, the ducted air conditioner 1 includes multiple fan assemblies 40, which are arranged along the axial direction of the volute 41. The separator 20 is provided with multiple connecting ports 21, which are connected to the outlets 413 of the air duct 411. The shell wall of the volute 41 of each fan assembly 40 defines multiple first noise reduction cavities 51, which can reduce the noise in the air duct 411 in each volute 41, thereby improving the noise reduction effect, reducing the noise transmitted from the ducted air conditioner 1 to the room, and improving the user experience.

[0124] Other components and operations of the duct-type air conditioner 1 according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0125] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," 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.

[0126] 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.

[0127] 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.

[0128] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0129] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A fan assembly, characterized in that, include: A volute, which defines an air outlet duct; A wind turbine, which is rotatably disposed in the air duct; The shell wall of the volute defines a first noise reduction cavity, which is elongated. The first noise reduction cavity and the air duct are connected through a first noise reduction hole, which is located at one end of the first noise reduction cavity along its length, while the other end of the first noise reduction cavity along its length is closed.

2. The wind turbine assembly according to claim 1, characterized in that, The first noise reduction cavity is connected to the air duct through a first noise reduction hole; or, the first noise reduction cavity is connected to the air duct through multiple first noise reduction holes and the multiple first noise reduction holes are arranged in the width direction of the first noise reduction cavity.

3. The wind turbine assembly according to claim 1, characterized in that, The first end of the first noise reduction hole is connected to the first noise reduction cavity and the second end is connected to the air duct. The airflow direction in the air duct near the second end is set at an obtuse angle to the center line of the first noise reduction hole extending from the second end to the first end.

4. The wind turbine assembly according to claim 1, characterized in that, The length of the first noise reduction cavity is 0.2-0.3 times the wavelength of the sound wave at a preset frequency.

5. The wind turbine assembly according to claim 4, characterized in that, The length of the first noise reduction cavity is one-quarter of the wavelength of the sound wave at a preset frequency, and the first noise reduction cavity is constructed as a quarter-wavelength tube structure.

6. The wind turbine assembly according to claim 1, characterized in that, The length of the first noise reduction cavity is 3cm-13cm.

7. The wind turbine assembly according to claim 1, characterized in that, The width of the first noise reduction cavity is 4mm-12mm; and / or, the dimension of the first noise reduction cavity in the wall thickness direction of the volute is 4mm-12mm.

8. The wind turbine assembly according to claim 1, characterized in that, The length of the first noise reduction cavity extends along the circumference of the volute, and the width extends along the axial direction of the volute.

9. The wind turbine assembly according to claim 8, characterized in that, The number of the first noise reduction cavities is multiple, and the multiple first noise reduction cavities are arranged in the axial and / or circumferential directions of the volute.

10. The wind turbine assembly according to claim 9, characterized in that, The plurality of first noise reduction cavities are divided into a plurality of noise reduction groups, and the plurality of noise reduction groups are arranged axially on the volute. The plurality of first noise reduction cavities in each noise reduction group are arranged circumferentially on the volute, and the plurality of first noise reduction cavities in two adjacent noise reduction groups are staggered.

11. The wind turbine assembly according to claim 8, characterized in that, The volute includes a first shell and a second shell formed separately. The first shell and the second shell are arranged opposite to each other and define the air duct between them. The first shell and / or the second shell are provided with the first noise reduction cavity and the first noise reduction hole.

12. The wind turbine assembly according to claim 11, characterized in that, The volute includes a first air duct wall and a volute tongue disposed opposite to each other, the outlet of the air duct is located between the first air duct wall and the volute tongue, the first air duct wall is located in the first housing, and the volute tongue is located in the second housing; The first noise reduction cavity and the first noise reduction hole are disposed in the first housing. The first noise reduction hole disposed on the first housing is located at one end of the first noise reduction cavity near the first air duct wall, and extends obliquely into the air duct in the circumferential direction of the impeller along the direction near the first air duct wall. And / or, the first noise reduction cavity and the first noise reduction hole are disposed in the second housing, the first noise reduction hole disposed on the second housing is located at the end of the first noise reduction cavity away from the volute tongue, and extends obliquely into the air duct in the circumferential direction of the impeller along the direction close to the volute tongue.

13. The wind turbine assembly according to claim 11, characterized in that, At least one of the first housing and the second housing includes: Shell body; A cover, which is located on the outside of the shell body; A partition rib is provided between the shell body and the cover body to define a plurality of first noise reduction cavities between the shell body and the cover body, and a plurality of first noise reduction holes are provided on the shell body.

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

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 separator is adapted to define a second noise reduction cavity, and the separator is provided with a second noise reduction hole, which connects the second noise reduction cavity and the connecting port.

17. The ducted air conditioner according to claim 16, characterized in that, The volute includes a first air duct wall and a volute tongue disposed opposite to each other, the outlet of the air duct is located between the first air duct wall and the volute tongue, and the second noise reduction cavity and the second noise reduction hole are disposed on the separator near the first air duct wall.

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