Air pipe type air conditioner

Abstract

The utility model discloses an air pipe type air conditioner which comprises an outer shell, an air pipe, an air inlet pipe, an air outlet pipe, an air inlet pipe and an air outlet pipe. The fan assembly is arranged in the fan cavity and defines an air duct, an inlet of the air duct communicates with the fan cavity, and an outlet of the air duct communicates with the heat exchange cavity; the heat exchanger is arranged in the heat exchange cavity; the shell further defines a noise reduction cavity, the noise reduction cavity and the heat exchange cavity are at least separated through a partition wall, a plurality of noise reduction holes are formed in the partition wall, and each noise reduction hole communicates with the noise reduction cavity and the heat exchange cavity. According to the air pipe type air conditioner, the noise reduction cavity communicated with the heat exchange cavity is formed in the heat exchange cavity, the sound absorption part is arranged in the noise reduction cavity, and the noise in the heat exchange cavity is reduced through the noise reduction cavity and the sound absorption part, so that noise reduction is achieved while the size of the air pipe type air conditioner is not increased, and the use experience of a user is improved conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to a duct type air conditioner. Background Art

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

[0003] The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the present utility model provides a ducted air conditioner that forms a noise reduction chamber in communication with the heat exchange chamber within the heat exchange chamber, and disposes a sound absorbing member within the noise reduction chamber. The noise reduction chamber and the sound absorbing member are utilized to reduce noise within the heat exchange chamber, thereby achieving noise reduction without increasing the size of the ducted air conditioner, thereby improving the user experience.

[0004] According to an embodiment of the utility model, the duct-type air conditioner includes: a shell, which defines a fan cavity and a heat exchange cavity; a fan assembly, which is arranged in the fan cavity and defines an air outlet duct, 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; a heat exchanger, which is arranged in the heat exchange cavity; wherein, the shell also defines a noise reduction cavity, the noise reduction cavity and the heat exchange cavity are separated by at least a partition wall, the partition wall is provided with a plurality of noise reduction holes and each of the noise reduction holes is connected to the noise reduction cavity and the heat exchange cavity, and a sound absorbing component is provided in the noise reduction cavity.

[0005] According to the duct-type air conditioner of the embodiment of the present invention, a noise reduction chamber connected to the heat exchange chamber is formed in the heat exchange chamber, and a sound-absorbing member is arranged in the noise reduction chamber. The noise in the heat exchange chamber is reduced by utilizing the noise reduction chamber and the sound-absorbing member, so as to achieve noise reduction without increasing the size of the duct-type air conditioner, thereby improving the user experience.

[0006] In addition, the duct-type air conditioner according to the above embodiment of the utility model may also have the following additional technical features:

[0007] According to some embodiments of the present invention, the noise reduction cavity has a first cavity wall arranged opposite to the partition wall, and the sound absorbing member is in contact with and cooperates with the first cavity wall and the partition wall.

[0008] According to some embodiments of the present invention, the noise reduction cavity has a first cavity wall arranged opposite to the partition wall, the sound absorbing member is in contact with and cooperates with the first cavity wall, and the side of the sound absorbing member facing away from the first cavity wall is spaced apart from the partition wall.

[0009] According to some embodiments of the present invention, the noise reduction cavity has a first cavity wall arranged opposite to the partition wall, the sound absorbing member is in contact with and cooperates with the partition wall, and the side of the sound absorbing member facing away from the partition wall is spaced apart from the first cavity wall.

[0010] According to some optional embodiments of the present invention, the sound absorbing member is sound absorbing cotton.

[0011] According to some embodiments of the present invention, the fan cavity and the heat exchange cavity are arranged in the horizontal direction, and the outer shell includes: a top plate; a noise reduction component, the noise reduction component is arranged on the inner side of the top plate and is arranged vertically opposite to the heat exchanger, the noise reduction component is suitable for defining the noise reduction cavity, and the noise reduction hole is arranged on the noise reduction component.

[0012] According to some optional embodiments of the present invention, the number of the noise reduction cavity is one; or, the number of the noise reduction cavity is multiple, and the multiple noise reduction cavities are arranged in the length direction and / or width direction of the top plate.

[0013] According to some optional embodiments of the present invention, at least a portion of the heat exchanger extends obliquely from top to bottom in a direction away from the fan assembly, and the noise reduction component is located on the air outlet side of the heat exchanger.

[0014] According to some optional embodiments of the present invention, at least a portion of the heat exchanger extends obliquely from top to bottom toward the direction close to the fan assembly, and the noise reduction component is located on the air inlet side of the heat exchanger.

[0015] According to some optional embodiments of the present invention, a partition extending along the vertical direction is provided in the outer shell, and the partition divides the inner cavity of the outer shell into the fan cavity and the heat exchange cavity. The partition has a connecting port, and the connecting port is connected between the outlet of the air duct and the heat exchange cavity. The noise reduction component is located between the partition and the heat exchanger.

[0016] According to some specific embodiments of the present invention, the fan assembly includes a volute and a wind wheel, the volute defines the air duct, and the wind wheel is rotatably disposed in the air duct; wherein, the volute includes a volute tongue and a first air duct wall, the volute tongue and the first air duct wall are both arranged in the transverse direction with the partition, and the volute tongue and the first air duct wall are located on the peripheral side of the connecting port and are arranged opposite to each other in the vertical direction.

[0017] In some embodiments, the volute includes a first shell and a second shell, the first shell and the second shell are formed separately, the first shell is connected above the second shell and the air duct is defined between the two; wherein the first air duct wall is located on the first shell and is integrally formed with the partition, and the volute tongue is located on the second shell and is mechanically connected to the partition.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 This is a structural diagram of a duct-type air conditioner according to an embodiment of the present utility model;

[0021] Figure 2 yes Figure 1 Cross-sectional view at AA in the middle;

[0022] Figure 3 yes Figure 1 Cross-sectional view at the middle BB;

[0023] Figure 4 This is a partial structural diagram of a duct-type air conditioner according to an embodiment of the present utility model;

[0024] Figure 5 This is a cross-sectional view of the structure of the noise reduction component according to an embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram of a structure in which a sound absorbing member is disposed in a noise reduction cavity according to some embodiments of the present invention, wherein the sound absorbing member is in contact with the first cavity wall and the partition wall;

[0026] Figure 7 Schematic diagram of a structure in which a sound absorbing member is disposed in a noise reduction cavity according to other embodiments of the present invention. In this case, the sound absorbing member contacts and cooperates with the first cavity wall, and the side of the sound absorbing member facing away from the first cavity wall is spaced apart from the partition wall.

[0027] Figure 8 Schematic diagram of a structure in which a sound absorbing member is disposed in a noise reduction cavity according to some other embodiments of the present invention, wherein the sound absorbing member contacts and cooperates with the partition wall, and a side of the sound absorbing member facing away from the partition wall is spaced apart from the first cavity wall;

[0028] Figure 9 This is a schematic diagram of the principle of the Helmholtz resonator.

[0029] Reference numerals: 1. duct air conditioner;

[0030] 10. Casing; 101. Top plate; 102. Noise reduction element; 11. Fan chamber; 12. Heat exchange chamber; 121. First heat exchange chamber; 122. Second heat exchange chamber; 151. Noise reduction chamber; 152. Noise reduction hole; 16. Partition wall; 17. First chamber wall;

[0031] 20. Separator; 21. Communication port; 30. Heat exchanger;

[0032] 40. Fan assembly; 41. Volute; 4101. First housing; 4102. Second housing; 411. Air duct; 421. Volute tongue; 422. First air duct wall; 45. Wind wheel;

[0033] 71. Sound-absorbing parts. DETAILED DESCRIPTION

[0034] 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.

[0035] The following describes a duct-type air conditioner 1 according to an embodiment of the present invention with reference to the accompanying drawings.

[0036] like Figure 1-Figure 4 As shown, the duct-type air conditioner 1 according to an embodiment of the present invention includes a housing 10 , a fan assembly 40 and a heat exchanger 30 .

[0037] The outer shell 10 defines a fan cavity 11 and a heat exchange cavity 12. The fan assembly 40 is disposed in the fan cavity 11 and defines an air duct 411. The inlet of the air duct 411 is connected to the fan cavity 11, and the outlet of the air duct 411 is connected to the heat exchange cavity 12. The heat exchanger 30 is disposed in the heat exchange cavity 12.

[0038] The fan assembly 40 is used to drive the air outside the duct air conditioner 1 into the fan chamber 11, so that the air in the fan chamber 11 enters the air duct 411 from the inlet of the air duct 411, flows along the air duct 411 from the outlet of the air duct 411 to the heat exchange chamber 12, and the air exchanges heat in the heat exchanger 30 in the heat exchange chamber 12 and flows into the room to cool or heat the room.

[0039] Among them, the shell 10 also defines a noise reduction chamber 151, and the noise reduction chamber 151 and the heat exchange chamber 12 are separated by at least a partition wall 16. The partition wall 16 is provided with a plurality of noise reduction holes 152, each noise reduction hole 152 connects the noise reduction chamber 151 and the heat exchange chamber 12, and a sound absorbing member 71 is provided in the noise reduction chamber 151. Sound waves can enter the noise reduction chamber 151 through the noise reduction holes 152, and the noise reduction chamber 151 and the sound absorbing member 71 work together to reduce noise.

[0040] Specifically, the heat exchanger 30 and the fan assembly 40 will generate noise when working. The sound waves transmitted to the heat exchange cavity 12 enter the noise reduction cavity 151 through the noise reduction hole 152. The sound waves will resonate in the noise reduction cavity 151 to consume the energy of the sound waves, thereby playing a noise reduction role.

[0041] Specifically, the flow area of ​​the noise reduction hole 152 is smaller than the flow area of ​​the noise reduction cavity 151. This allows the noise reduction hole 152 and the noise reduction cavity 151 to cooperate to form a Helmholtz resonator. In this way, when air flows from the noise reduction hole 152 into the noise reduction cavity 151, since the flow area of ​​the noise reduction cavity 151 is larger than the flow area of ​​the noise reduction hole 152, the flow velocity of the air in the noise reduction cavity 151 is much lower than the flow velocity of the local airflow in the center of the noise reduction cavity 151, thereby forming a more intense shear flow in the noise reduction cavity 151, accompanied by unstable disturbance waves. At the same time, if the air column in the noise reduction hole 152 is affected The disturbance moves into the noise reduction chamber 151, and the gas in the noise reduction chamber 151 is compressed, and the pressure increases. At this time, the air in the noise reduction hole 152 is blocked from moving inward and moves outward. After passing the equilibrium position, it continues to move outward due to inertia, which reduces the pressure in the noise reduction chamber 151. In turn, the air column in the noise reduction hole 152 stops moving outward and moves inward again, over and over again. When the frequency of the disturbance wave matches the frequency of the incoming air flow, a resonance phenomenon is formed, thereby reducing or eliminating noise to achieve the purpose of noise reduction.

[0042] It should be noted that the resonant frequency of a Helmholtz resonator depends on its geometry and volume. Therefore, the flow area of ​​noise reduction holes 152 and / or the flow area of ​​noise reduction chamber 151 can be adjusted based on the frequency of the noise to be eliminated. In other words, the combination of noise reduction holes 152 and noise reduction chamber 151 can absorb noise of a specific frequency, achieving the purpose of noise reduction, reducing the noise generated by the ducted air conditioner 1 during operation to a certain extent, and improving the user experience.

[0043] Specifically, the noise frequency to be eliminated S is the cross-sectional area of ​​the noise reduction hole 152, S=πD 2 / 4, V is the volume of the noise reduction cavity 151, L is the length of the noise reduction hole 152 (for details, see Figure 9 ).

[0044] Based on this, in a specific example, the cross-sectional area of ​​the noise reduction hole 152 , the volume of the noise reduction cavity 151 or the length of the noise reduction hole 152 can be adjusted to achieve the absorption of noises of different frequencies by using the noise reduction hole 152 and the noise reduction cavity 151 .

[0045] In addition, when the sound waves enter the noise reduction cavity 151 through the noise reduction hole 152, since the cross-sectional area of ​​the noise reduction hole 152, the volume of the noise reduction cavity 151 and the length of the noise reduction hole 152 are certain, the noise reduction cavity 151 is able to reduce noise within a certain frequency range. For noise above or below the frequency range, the sound-absorbing member 71 in the noise reduction cavity 151 can be used to absorb the noise, thereby improving the noise reduction effect.

[0046] According to the duct-type air conditioner 1 of the embodiment of the present invention, a noise reduction chamber 151 connected to the heat exchange chamber 12 is formed in the heat exchange chamber 12, and a sound absorbing member 71 is arranged in the noise reduction chamber 151. The noise in the heat exchange chamber 12 is reduced by utilizing the noise reduction chamber 151 and the sound absorbing member 71, so as to achieve noise reduction without increasing the size of the duct-type air conditioner 1, thereby improving the user experience.

[0047] The following describes a duct-type air conditioner 1 according to a specific embodiment of the present invention with reference to the accompanying drawings.

[0048] In some specific embodiments of the present invention, Figure 1-Figure 4 As shown, the ducted air conditioner 1 includes a housing 10 , a fan assembly 40 and a heat exchanger 30 .

[0049] In some embodiments of the present invention, Figure 6 As shown, the noise reduction cavity 151 has a first cavity wall 17 arranged opposite to the partition wall 16, and the sound absorbing member 71 contacts and cooperates with the first cavity wall 17 and the partition wall 16 to have a better noise reduction effect on noise in a specific frequency range.

[0050] In some embodiments, the sound absorbing member 71 fills the noise reduction cavity 151 to achieve a better noise reduction effect on noise of a specific frequency.

[0051] In other embodiments of the present invention, Figure 7 As shown, the noise reduction cavity 151 has a first cavity wall 17 arranged opposite to the partition wall 16, and the sound absorbing member 71 is in contact with the first cavity wall 17. The side of the sound absorbing member 71 facing away from the first cavity wall 17 is spaced apart from the partition wall 16 to form an air layer between the sound absorbing member 71 and the partition wall 16, thereby having a better noise reduction effect on noise in a specific frequency range.

[0052] In some other embodiments of the present invention, Figure 8As shown, the noise reduction cavity 151 has a first cavity wall 17 arranged opposite to the partition wall 16, and the sound absorbing member 71 is in contact with the partition wall 16. The side of the sound absorbing member 71 facing away from the partition wall 16 is spaced apart from the first cavity wall 17 to form an air layer between the sound absorbing member 71 and the first cavity wall 17, thereby having a better noise reduction effect on noise in a specific frequency range.

[0053] It needs to be explained here that the noise reduction cavity 151 and the sound absorbing member 71 have a good effect on noise in a specific frequency range, wherein the noise reduction effect of the noise reduction cavity 151 and the sound absorbing member 71 is related to the size of the noise reduction hole 152, the size of the noise reduction cavity 151, the size of the sound absorbing member 71, and the distance between the sound absorbing member 71 and the first cavity wall 17, and the distance between the sound absorbing member 71 and the partition wall 16.

[0054] In some optional embodiments of the present invention, the sound absorbing member 71 is sound absorbing cotton, and the sound can enter the sound absorbing cotton and be absorbed by the sound absorbing cotton, thereby achieving a noise reduction effect.

[0055] In some examples, the sound-absorbing member 71 is a melamine sponge. Melamine sponge has a high porosity, allowing sound waves to quickly enter the sponge and be consumed and absorbed. Its internal three-dimensional network effectively attenuates and eliminates sound wave energy, demonstrating excellent sound absorption. Furthermore, the melamine sponge's fine pores and semi-open structure absorb incoming sound waves, reducing interference and echoes from reflected sound within the room, maintaining sound purity, and achieving excellent sound absorption.

[0056] In some embodiments of the present invention, Figure 2 、 Figure 4 As shown, the fan chamber 11 and the heat exchange chamber 12 are arranged in the horizontal direction, and the shell 10 includes a top plate 101 and a noise reduction member 102. The noise reduction member 102 is arranged on the inner side of the top plate 101 and is arranged vertically opposite to the heat exchanger 30. The noise reduction member 102 is suitable for defining a noise reduction chamber 151. The noise reduction hole 152 is provided in the noise reduction member 102, so that the sound waves in the heat exchange chamber 12 can enter the noise reduction chamber 151 from the noise reduction hole 152, so that the sound waves resonate in the noise reduction chamber 151 to consume the energy of the sound waves, thereby playing a noise reduction role.

[0057] In some embodiments, the fan cavity 11 extends laterally in the front-to-back direction, is located at the rear side of the heat exchange cavity 12 , and the noise reduction component 102 is disposed at the top of the heat exchange cavity 12 .

[0058] In some embodiments, the noise reduction component 102 has a partition wall 16 and a first cavity wall 17 arranged vertically opposite each other. The first cavity wall 17 is located on the side of the top plate 101 facing the heat exchanger 30, and the partition wall 16 is located on the side of the noise reduction component 102 facing the heat exchanger 30. A plurality of noise reduction holes 152 are provided on the partition wall 16 so that the sound waves in the heat exchange cavity 12 can enter the noise reduction cavity 151 through the noise reduction holes 152, and then resonate in the noise reduction cavity 151 to consume the energy of the sound waves, thereby playing a noise reduction role.

[0059] In some examples, the partition wall 16 and the first cavity wall 17 are made of different materials, wherein the partition 20 is a micro-perforated plate having a plurality of micro-holes arranged at intervals, thereby defining the noise reduction hole 152 .

[0060] In some optional embodiments of the present invention, the number of the noise reduction cavity 151 is one.

[0061] In some embodiments, by providing a noise reduction cavity 151 and arranging a sound absorbing member 71 in the noise reduction cavity 151 , the noise can be reduced by about 2 dB without changing the original basic structure of the duct-type air conditioner 1 .

[0062] In some examples, the noise reduction chamber 151 is connected to the heat exchange chamber 12 through a plurality of noise reduction holes 152 , wherein the cross-sectional area and length of each noise reduction hole 152 are the same.

[0063] In other optional embodiments of the present invention, there are multiple noise reduction cavities 151, and the multiple noise reduction cavities 151 are arranged in the length direction and / or width direction of the top plate 101, so as to utilize the multiple noise reduction cavities 151 to consume the energy of sound waves and thereby play a noise reduction role.

[0064] Among them, the volumes of some noise reduction cavities 151 are the same, the volumes of some noise reduction cavities 151 are different, the hole cross-sectional areas and lengths of some noise reduction holes 152 are the same, and the hole cross-sectional areas and lengths of some noise reduction holes 152 are different, so that noises of different frequencies can resonate in different noise reduction cavities 151, so as to have a better noise reduction effect on noises with a wider frequency.

[0065] In some embodiments, as Figure 4 As shown, the length direction of the top plate 101 extends longitudinally, and the width direction of the top plate 101 extends transversely. Multiple noise reduction cavities 151 are arranged in the transverse and longitudinal directions to utilize limited space to define multiple noise reduction cavities 151, and then utilize multiple noise reduction cavities 151 to reduce noise within a wider frequency range.

[0066] In some embodiments, the noise reduction component 102 has a partition wall 16 and a first cavity wall 17 arranged vertically opposite each other, and a partition rib is provided between the partition wall 16 and the first cavity wall 17 to divide the space between the partition wall 16 and the first cavity wall 17 into multiple noise reduction cavities 151.

[0067] In some examples, the partition ribs include transverse partition ribs and longitudinal partition ribs, multiple transverse partition ribs are arranged along the longitudinal direction, and multiple longitudinal partition ribs are arranged along the transverse direction to divide the space between the partition wall 16 and the first cavity wall 17 into multiple noise reduction cavities 151.

[0068] In some optional embodiments of the present invention, such as Figure 2 、 Figure 3 As shown, at least a portion of the heat exchanger 30 extends obliquely from top to bottom in a direction away from the fan assembly 40 , and the noise reduction member 102 is located on the air outlet side of the heat exchanger 30 .

[0069] In some embodiments, the heat exchanger 30 divides the heat exchange chamber 12 into a first heat exchange chamber 121 and a second heat exchange chamber 122. The first heat exchange chamber 121 is connected to the outlet of the air duct 411, and the second heat exchange chamber 122 is connected to the air outlet of the outer shell 10. The noise reduction component 102 is arranged at the bottom of the second heat exchange chamber 122, that is, located at the bottom of the heat exchange chamber 12. The sound waves in the heat exchange chamber 12 can enter the noise reduction chamber 151 through the noise reduction hole 152 at the bottom thereof. The sound waves resonate in the noise reduction chamber 151 to consume the energy of the sound waves, thereby playing a noise reduction role.

[0070] In other optional embodiments of the present invention, Figure 3 、 Figure 4 As shown, at least a portion of the heat exchanger 30 extends obliquely from top to bottom toward the direction close to the fan assembly 40 , and the noise reduction member 102 is located on the air inlet side of the heat exchanger 30 .

[0071] In some embodiments, as Figure 3 As described, the heat exchanger 30 divides the heat exchange chamber 12 into a first heat exchange chamber 121 and a second heat exchange chamber 122. The first heat exchange chamber 121 is connected to the outlet of the air duct 411, and the second heat exchange chamber 122 is connected to the air outlet of the shell 10. The noise reduction component 102 is arranged at the top of the first heat exchange chamber 121, that is, located at the top of the heat exchange chamber 12. The sound waves in the heat exchange chamber 12 can enter the noise reduction chamber 151 through the noise reduction hole 152 at its top. The sound waves resonate in the noise reduction chamber 151 to consume the energy of the sound waves, thereby playing a noise reduction role.

[0072] In some optional embodiments of the present invention, such as Figure 3As shown, a partition 20 extending vertically is provided in the outer shell 10, and the partition 20 divides the inner cavity of the outer shell 10 into a fan cavity 11 and a heat exchange cavity 12. The partition 20 has a connecting port 21, which connects the outlet of the air duct 411 and the heat exchange cavity 12. The noise reduction component 102 is located between the partition 20 and the heat exchanger 30.

[0073] In some specific embodiments of the present invention, Figure 2 、 Figure 3 As shown, the fan assembly 40 includes a volute 41 and a wind wheel 45, the volute 41 defines an air duct 411, and the wind wheel 45 is rotatably arranged in the air duct 411, wherein the volute 41 includes a volute tongue 421 and a first air duct wall 422, the volute tongue 421 and the first air duct wall 422 are both arranged horizontally with the partition 20, and the volute tongue 421 and the first air duct wall 422 are located on the peripheral side of the connecting port 21 and are arranged vertically opposite to each other.

[0074] Among them, driven by the wind wheel 45, the air in the air duct 411 enters the heat exchange chamber 12 from the outlet through the connecting port 21, and the first air duct wall 422 has a guiding effect on the flow of air, so as to guide the air to the noise reduction component 102, so that the sound waves can smoothly enter the noise reduction chamber 151 from the noise reduction hole 152, so that the sound waves can resonate in the noise reduction chamber 151 to consume the energy of the sound waves, thereby achieving a better noise reduction effect.

[0075] Specifically, when the impeller 45 is in operation, it draws air from outside the duct air conditioner 1 into the housing 10. After the impeller 45 works to increase the pressure, the air is sent from the air outlet to the room to form a cycle. During this process, the high-speed rotation of the impeller 45 causes the airflow to flow through the impeller 45. Due to the influence of the viscous friction of air molecules, the airflow with a certain speed interacts with the relatively static airflow behind the impeller 45, forming an airflow with vortices in the downstream area of ​​the impeller 45. These vortices are constantly changing and falling off. The pressure at the center of each vortex is lower than the pressure of the surrounding medium. When a vortex falls off, a pressure jump occurs in the turbulent airflow. These pressure jumps propagate outward through the surrounding medium and act on the impeller 45. When the pressure pulsation in the turbulent flow contains audible frequency components and the intensity is large enough, noise is radiated, forming turbulent noise. As the impeller 45 rotates, it sweeps through the air in the vicinity. Due to the interaction of forces, the gas medium is affected by the impeller 45, generating a periodic pressure field and emitting noise. As the air flows over the impeller 45, 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 those in the mainstream region. As the impeller 45 rotates, the airflow at the outlet of the air duct 411 becomes highly non-uniform. This non-uniform potential flow field periodically acts on surrounding obstacles, generating noise similar to the sound produced by stroking a string.

[0076] In some embodiments, the noise reduction component 102 is arranged on one side of the first air duct wall 422 in the horizontal direction, so that the first air duct wall 422 is used to guide the air to the noise reduction component 102, so that the noise generated at the wind wheel 45 can smoothly pass through the noise reduction hole 152 into the noise reduction cavity 151, and then the sound waves can resonate in the noise reduction cavity 151 to consume the energy of the sound waves, thereby achieving a better noise reduction effect.

[0077] In some embodiments, a plurality of fan assemblies 40 are provided in the fan cavity 11 , and the plurality of fan assemblies 40 are arranged in a transverse direction. The partition 20 defines a plurality of communication openings 21 , and the plurality of communication openings 21 are connected to the outlet of the air duct 411 one by one.

[0078] The duct air conditioner 1 includes a plurality of noise reduction components 102, which are arranged horizontally and provided at the top of the heat exchange chamber 12 (it should be understood here that the above-mentioned direction limitation is only for the convenience of describing the accompanying drawings and will not limit the actual setting position and direction of the duct air conditioner 1), so that the air flowing out of the air duct 411 can pass through the corresponding noise reduction holes 152, and then into the corresponding noise reduction chamber 151, and then respectively reduce the noise near the multiple fan components 40, thereby improving the noise reduction efficiency and achieving a better noise reduction effect.

[0079] In some embodiments, as Figure 2 、 Figure 3 As shown, the volute 41 includes a first shell 4101 and a second shell 4102. The first shell 4101 and the second shell 4102 are formed separately. The first shell 4101 is connected to the top of the second shell 4102 and an air duct 411 is defined between the two to facilitate the placement of the wind wheel 45 in the air duct 411, thereby reducing the difficulty of assembly.

[0080] Among them, the first air duct wall 422 is located on the first shell 4101 and is integrally formed with the partition 20, which makes it easy to reduce the number of parts and components, thereby reducing the difficulty of assembly. The volute tongue 421 is located on the second shell 4102 and is mechanically connected to the partition 20 to connect the first shell 4101 and the second shell 4102, thereby defining the air duct 411.

[0081] In some specific embodiments of the present invention, a better noise reduction effect can be achieved by designing the hole cross-sectional area S of a single noise reduction hole 152, the depth L of the noise reduction hole 152 and the number x of noise reduction holes 152 connected to a single noise reduction cavity 151.

[0082] Specifically, it is said here that the multiple noise reduction cavities 151 form a complete sound absorption structure, and the acoustic impedance Z of the sound absorption structure satisfies:

[0083] where Z HHThe acoustic impedance Z of the single noise reduction cavity 151 is represented by n, and the ordinal number of the noise reduction cavity 151 is represented by n. HH satisfy:

[0084]

[0085] The volume of the noise reduction cavity 151 is V, the cross-sectional area of ​​a single noise reduction hole 152 is S, and the surface area of ​​the inner side of the opening of the noise reduction cavity 151 is S. ca The depth of the noise reduction hole 152 is L, the number of noise reduction holes 152 connected to a single noise reduction cavity 151 is x, and the wall thickness of the volute 41 is l u .

[0086] 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 circular frequency, η is the air dynamic viscosity, and A is the surface area of ​​the side of the noise reduction member 102 where the noise reduction cavity 151 is provided.

[0087] ρ ca 、c ca and k ca represent the density, sound speed and wave number of the air in the noise reduction chamber 152, respectively, k ap , ψ va and ψ ha They represent the wave number, viscosity term and thermal term of the annular constriction under narrow acoustics, γ represents the specific heat of air, δ represents the sound mass correction coefficient, and τ represents the sound volume correction coefficient.

[0088] The vertical incident sound absorption coefficient α of the sound absorbing structure can be calculated by the following formula:

[0089]

[0090] Among them, through data simulation, it can be concluded that for sounds of a certain frequency, by adjusting the cross-sectional area S of a single noise reduction hole 152, the depth L of the noise reduction hole 152, and the number x of noise reduction holes 152 connected to a single noise reduction cavity 151, a larger incident sound absorption coefficient α can be obtained, thereby making the noise reduction efficiency of the sound-absorbing structure higher.

[0091] In addition, the volume V of the noise reduction cavity 151, the cross-sectional area S of a single noise reduction hole 152, and the surface area S of the inner side of the opening of the noise reduction cavity 151 are calculated. ca The number x of noise reduction holes 152 connected to a single noise reduction cavity 151 can be set within the following range to effectively reduce noise of 400 Hz-2000 Hz.

[0092] 500mm 3 ≤V≤64000mm 3

[0093] 1.44mm 2 ≤S≤100mm 2

[0094] 100mm 2 ≤S ca ≤1600mm 2

[0095] 1≤x≤9

[0096] For the wall thickness of the volute 41, u The values ​​of the depth L of the noise reduction hole 152, the volume V of the noise reduction cavity 151, and the cross-sectional area S of a single noise reduction hole 152 can follow the following formula to effectively reduce the noise of 400hz-2000hz.

[0097] l u ≤L≤V / S ca *0.5

[0098] Other structures and operations of the duct air conditioner according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0099] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0100] In the description of the present invention, a first feature “above”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0101] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0102] 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.

[0103] 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 duct type air conditioner, characterized in that: include: a housing defining a blower cavity and a heat exchange cavity; a fan assembly, the fan assembly being disposed in the fan cavity and defining an air duct, the inlet of the air duct being in communication with the fan cavity, and the outlet of the air duct being in communication with the heat exchange cavity; a heat exchanger, the heat exchanger being arranged in the heat exchange cavity; In which, the shell also defines a noise reduction chamber, the noise reduction chamber and the heat exchange chamber are separated by at least a partition wall, a plurality of noise reduction holes are provided on the partition wall and each noise reduction hole connects the noise reduction chamber and the heat exchange chamber, and a sound absorbing component is provided in the noise reduction chamber.

2. The duct type air conditioner according to claim 1, characterized in that: The noise reduction cavity has a first cavity wall arranged opposite to the partition wall, and the sound absorbing member is in contact with and cooperates with the first cavity wall and the partition wall.

3. The duct type air conditioner according to claim 1, characterized in that: The noise reduction cavity has a first cavity wall arranged opposite to the partition wall. The sound absorbing member contacts and cooperates with the first cavity wall. The side of the sound absorbing member facing away from the first cavity wall is spaced apart from the partition wall.

4. The duct type air conditioner according to claim 1, characterized in that: The noise reduction cavity has a first cavity wall arranged opposite to the partition wall. The sound absorbing member contacts and cooperates with the partition wall. The side of the sound absorbing member facing away from the partition wall is spaced apart from the first cavity wall.

5. The duct type air conditioner according to claim 1, characterized in that: The sound absorbing component is sound absorbing cotton.

6. The duct-type air conditioner according to any one of claims 1 to 5, characterized in that: The fan cavity and the heat exchange cavity are arranged in the transverse direction, and the housing includes: roof; A noise reduction member is provided on the inner side of the top plate and is arranged vertically opposite to the heat exchanger. The noise reduction member is suitable for defining the noise reduction cavity. The noise reduction hole is provided on the noise reduction member.

7. The duct type air conditioner according to claim 6, characterized in that: The number of the noise reduction cavity is one; or, the number of the noise reduction cavity is multiple, and the multiple noise reduction cavities are arranged in the length direction and / or width direction of the top plate.

8. The duct type air conditioner according to claim 6, characterized in that: At least a portion of the heat exchanger extends obliquely from top to bottom in a direction away from the fan assembly, and the noise reduction component is located on the air outlet side of the heat exchanger.

9. The duct type air conditioner according to claim 6, characterized in that: At least a portion of the heat exchanger extends obliquely from top to bottom toward the direction close to the fan assembly, and the noise reduction component is located on the air inlet side of the heat exchanger.

10. The duct type air conditioner according to claim 6, characterized in that: A partition extending along the vertical direction is provided in the shell, and the partition divides the inner cavity of the shell into the fan cavity and the heat exchange cavity. The partition has a connecting port, and the connecting port connects between the outlet of the air duct and the heat exchange cavity. The noise reduction component is located between the partition and the heat exchanger.

11. The duct type air conditioner according to claim 10, characterized in that: The fan assembly includes a volute and a wind wheel, the volute defines the air duct, and the wind wheel is rotatably disposed in the air duct; The volute includes a volute tongue and a first air duct wall, the volute tongue and the first air duct wall are arranged in the transverse direction with the partition, and the volute tongue and the first air duct wall are located on the peripheral side of the connecting port and are arranged opposite to each other in the vertical direction.

12. The duct type air conditioner according to claim 11, characterized in that: The volute includes a first shell and a second shell, the first shell and the second shell are formed separately, the first shell is connected to the upper part of the second shell and the air duct is defined between the first shell and the second shell; The first air duct wall is located on the first shell and is integrally formed with the partition, and the volute tongue is located on the second shell and is mechanically connected to the partition.

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