Air pipe type air conditioner

Abstract

The utility model discloses an air duct type air conditioner which comprises a shell, an air duct, an air duct and a fan. The partition piece is arranged in the shell so as to divide an inner cavity of the shell into a heat exchange cavity and a fan cavity, and a communicating opening is defined by the partition piece; the heat exchanger is arranged in the heat exchange cavity; 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 through the communicating opening; wherein the fan assembly comprises a volute and a cover body, the volute defines an air duct, an outlet of the air duct communicates with the heat exchange cavity through a communicating port, the cover body is arranged on the outer side of the volute, and a first noise reduction cavity is defined between the cover body and the volute. According to the air duct type air conditioner, the first noise reduction cavity communicated with the air duct is formed, so that sound waves in the air duct can enter the first noise reduction cavity through the first noise reduction holes, the sound waves resonate after entering the first noise reduction cavity, and sound energy is consumed through the resonance effect.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, and 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 invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a ducted air conditioner that forms a first noise reduction chamber connected to the air duct, allowing sound waves in the air duct to enter the first noise reduction chamber through a first noise reduction hole. Upon entering the first noise reduction chamber, the sound waves resonate, dissipating sound energy through the resonance effect, thereby achieving the purpose of sound absorption and noise reduction, thereby improving the user experience.

[0004] 18. The duct-type air conditioner of claim 17, wherein the air conditioner further comprises a fan, the fan having a first end connected to the fan housing, the second end connected to the fan housing, and the second end connected to the fan housing. The fan has a first end connected to the fan housing, and a second end connected to the fan housing. The fan has a first end connected to the fan housing, and a second end connected to the fan housing.

[0005] According to the duct-type air conditioner of the embodiment of the present invention, a first noise reduction cavity connected to the air duct is formed, so that the sound waves in the air duct can enter the first noise reduction cavity through the first noise reduction hole. After the sound waves enter the first noise reduction cavity, resonance will occur, and the sound energy will be consumed through the resonance effect, thereby achieving the purpose of sound absorption and noise reduction, which is convenient for 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 volute includes a first shell and a second shell, the air duct is defined between the first shell and the second shell, and the cover is arranged on the outside of the first shell and / or the second shell.

[0008] According to some optional embodiments of the present invention, the first shell includes a first air duct wall, and the second shell includes a volute tongue, and the volute tongue and the first air duct wall are arranged opposite to each other and are located on the peripheral side of the connecting port; wherein, the cover body is arranged on the outside of the first air duct wall and defines the first noise reduction cavity between the cover body and the first air duct wall, and the first noise reduction hole is arranged in the first air duct wall; or, the cover body is arranged on the outside of the second shell and defines the first noise reduction cavity between the cover body and the second shell, and the first noise reduction hole is arranged in the second shell.

[0009] According to some specific embodiments of the present invention, the cover body is arranged on the outside of the second shell and defines the first noise reduction cavity between the cover body and the second shell. The cover body is at least partially arranged opposite to the volute tongue, and at least a part of the first noise reduction hole is arranged on the volute tongue.

[0010] According to some embodiments of the present invention, the air inlet portion includes a first air inlet and a second air inlet, the first air inlet is arranged on the bottom wall of the outer shell, the bottom wall of the outer shell is provided with a wind shield for covering a portion of the first air inlet, and the second air inlet is arranged on the side wall of the outer shell opposite to the partition.

[0011] According to some optional embodiments of the present invention, the volute includes a volute tongue and a first air duct wall, the volute tongue and the first air duct wall are located on the peripheral side of the connecting port and are both connected to the partition, the volute tongue is located below the first air duct wall, and the wind shield is arranged close to the partition and opposite to the volute tongue.

[0012] According to some optional embodiments of the present invention, on the plane where the bottom wall of the shell is located, the projection of the volute tongue is located within the projection of the wind shield.

[0013] According to some optional embodiments of the present invention, the dimension of the wind shield in the transverse direction is 20 mm-45 mm.

[0014] According to some optional embodiments of the present invention, the volute tongue extends in the longitudinal direction, the length direction of the wind shield extends in the longitudinal direction, and the two ends of the wind shield in the longitudinal direction are connected to two side walls of the shell arranged opposite to each other in the longitudinal direction.

[0015] According to some optional embodiments of the present invention, the wind shield is a wind shield plate, and the wind shield plates have consistent vertical dimensions.

[0016] According to some optional embodiments of the present invention, the vertical dimension of the wind shield gradually decreases in a direction approaching the partition.

[0017] According to some embodiments of the present invention, the wind shield defines a second noise reduction cavity, and a second noise reduction hole is provided on a side of the wind shield facing the fan cavity, and the second noise reduction hole connects the second noise reduction cavity and the fan cavity.

[0018] According to some optional embodiments of the present invention, the outer shell includes: a shell body, the partition is arranged in the shell body; an air inlet frame, the air inlet frame is arranged on the side of the shell body and is arranged opposite to the partition in the horizontal direction, the fan chamber is located between the air inlet frame and the partition, and the second air inlet is arranged in the air inlet frame.

[0019] According to some optional embodiments of the present invention, there are multiple second air inlets, and the multiple second air inlets are arranged in the length direction and / or width direction of the air inlet frame.

[0020] According to some optional embodiments of the present invention, the air inlet frame has an air guide flange extending toward the fan cavity, and the air guide flange is an annular flange extending along the circumference of the second air inlet.

[0021] According to some embodiments of the present invention, the partition is suitable for defining a third noise reduction chamber, and a third noise reduction hole is provided on the partition, and the third noise reduction chamber is connected to the connecting port or the fan chamber through the third noise reduction hole.

[0022] 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

[0023] 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:

[0024] Figure 1 This is a schematic structural diagram of a duct-type air conditioner in one direction according to an embodiment of the present utility model;

[0025] Figure 2 This is a schematic structural diagram of the duct-type air conditioner according to an embodiment of the present utility model in another direction;

[0026] Figure 3 is a top view of a duct-type air conditioner according to an embodiment of the present utility model;

[0027] Figure 4 yes Figure 3Cross-sectional view at AA in the middle;

[0028] Figure 5 1 is a schematic structural diagram of a fan assembly and a partition according to an embodiment of the present utility model;

[0029] Figure 6 This is an exploded view of the fan assembly and the partition according to an embodiment of the present invention;

[0030] Figure 7 yes Figure 6 Enlarged view of point E in the middle;

[0031] Figure 8 is a structural schematic diagram of an air inlet frame according to some embodiments of the present utility model;

[0032] Figure 9 is a front view of an air inlet frame according to some embodiments of the present utility model;

[0033] Figure 10 yes Figure 9 Cross-sectional view at the middle BB;

[0034] Figure 11 It is a structural schematic diagram of an air inlet frame according to other embodiments of the present utility model;

[0035] Figure 12 2 is a schematic structural diagram of an air inlet frame according to some other embodiments of the present invention;

[0036] Figure 13 This is a schematic diagram of the principle of the Helmholtz resonator.

[0037] Reference numerals: 1. duct air conditioner;

[0038] 10. Housing; 101. Housing body; 102. Air inlet frame; 103. Air guide flange; 104. Fixed flange; 105. Reinforcement rib; 11. Fan chamber; 12. Heat exchange chamber; 13. Air inlet; 131. First air inlet; 132. Second air inlet; 14. Air outlet; 15. Fitting portion;

[0039] 20. Separator; 21. Communication port; 22. Third noise reduction chamber; 23. Third noise reduction hole; 24. Connecting slot; 30. Heat exchanger;

[0040] 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. Wind wheel; 47. Cover; 471. Connecting protrusion; 481. First noise reduction cavity; 482. First noise reduction hole; 51. Separating rib;

[0041] 60. Wind shield; 601. First part; 602. Second part; 61. Second noise reduction chamber. DETAILED DESCRIPTION

[0042] 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.

[0043] The following describes a duct-type air conditioner 1 according to an embodiment of the present invention with reference to the accompanying drawings.

[0044] 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 partition 20 , a heat exchanger 30 and a fan assembly 40 .

[0045] The housing 10 has an air inlet 13 and an air outlet 14. A partition 20 is arranged in the housing 10 to divide the inner cavity of the housing 10 into a heat exchange chamber 12 and a fan chamber 11 arranged in the transverse direction. The partition 20 defines a connecting port 21. The heat exchange chamber 12 is connected to the air outlet 14, and the fan chamber 11 is connected to the air inlet 13. The heat exchanger 30 is arranged in the heat exchange chamber 12. The fan assembly 40 is arranged in the fan chamber 11 and defines an air outlet duct 411. 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 connecting port 21.

[0046] The fan assembly 40 is used to drive the air outside the duct air conditioner 1 into the fan cavity 11 from the air inlet 13, so that the air in the fan cavity 11 enters the air duct 411 from the inlet 412 of the air duct 411, and flows along the air duct 411 from the air outlet of the air duct 411 through the connecting port 21 to the heat exchange cavity 12. After the air is heat exchanged in the heat exchanger 30 in the heat exchange cavity 12, it flows from the air outlet 14 to the room to cool or heat the room.

[0047] The fan assembly 40 includes a volute 41 and a cover 47 . The volute 41 defines an air duct 411 . An outlet 413 of the air duct 411 is connected to the heat exchange chamber 12 via a connecting port 21 .

[0048] The air outside the duct air conditioner 1 is suitable for entering the fan cavity 11 through the air inlet 13. The air in the fan cavity 11 enters the air duct 411 from the inlet 412 of the air duct 411, flows along the air duct 411 from the air outlet and the connecting port 21 of the air duct 411 to the heat exchange cavity 12. After the air is heat exchanged in the heat exchanger 30 in the heat exchange cavity 12, it flows from the air outlet 14 to the room to cool or heat the room.

[0049] The cover body 47 is arranged on the outside of the volute 41 and defines a first noise reduction chamber 481 between the cover body 47 and the volute 41. The volute 41 is provided with a first noise reduction hole 482. The first noise reduction hole 482 connects the first noise reduction chamber 481 and the air duct 411, so that the sound waves in the air duct 411 can enter the first noise reduction chamber 481 through the first noise reduction hole 482. The sound waves will resonate in the first noise reduction chamber 481 to consume the energy of the sound waves, thereby playing a noise reduction role.

[0050] Specifically, the cover body 47 and the volute 41 are used to jointly define the first noise reduction cavity 481, which makes it easier to reduce the difficulty of forming the first noise reduction cavity 481, thereby making it easier to reduce the manufacturing difficulty and the production cost.

[0051] Among them, by setting the first noise reduction cavity 481 and the first noise reduction hole 482, the flow area of ​​the first noise reduction hole 482 is smaller than the flow area of ​​the first noise reduction cavity 481. So that the first noise reduction hole 482 and the first noise reduction cavity 481 can cooperate to form a Helmholtz resonator. In this way, when air flows into the noise reduction cavity from the first noise reduction hole 482, since the flow area of ​​the first noise reduction cavity 481 is larger than the flow area of ​​the first noise reduction hole 482, the flow velocity of the air in the first noise reduction cavity 481 is much smaller than the flow velocity of the local airflow in the center of the first noise reduction cavity 481, thereby forming a more violent shear flow in the first noise reduction cavity 481, accompanied by unstable disturbance waves. At the same time, if the air in the first noise reduction hole 482 The column is disturbed and moves into the first noise reduction chamber 481. The gas in the first noise reduction chamber 481 is compressed and the pressure increases. At this time, the air in the first noise reduction hole 482 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 first noise reduction chamber 481. In turn, the air column in the first noise reduction hole 482 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, resonance is formed, thereby reducing or eliminating noise to achieve the purpose of noise reduction.

[0052] It should be noted that the resonant frequency of a Helmholtz resonator depends on its geometry and volume. Therefore, the flow area of ​​the first noise reduction hole 482 and / or the flow area of ​​the first noise reduction cavity 481 can be adjusted based on the frequency of the noise to be eliminated. In other words, the combination of the first noise reduction hole 482 and the first noise reduction cavity 481 can absorb noise of a specific frequency, achieving the purpose of noise reduction, reducing the noise generated by the rotation of the impeller 45 to a certain extent, and improving the user experience.

[0053] Among them, the noise frequency to be eliminated S is the cross-sectional area of ​​the first noise reduction hole 482, S=πD 2 / 4, V is the volume of the first noise reduction cavity 481, L is the length of the first noise reduction hole 482 (for details, see Figure 13 ).

[0054] Based on this, in a specific example, the first noise reduction hole 482 and the first noise reduction cavity 481 can be used to absorb noise of different frequencies by adjusting the cross-sectional area of ​​the first noise reduction hole 482 , the volume of the first noise reduction cavity 481 or the length of the first noise reduction hole 482 .

[0055] According to the duct-type air conditioner 1 of the embodiment of the present invention, a first noise reduction chamber 481 connected to the air duct 411 is formed, so that the sound waves in the air duct 411 can enter the first noise reduction chamber 481 through the first noise reduction hole 482. After the sound waves enter the first noise reduction chamber 481, resonance will occur, and the sound energy will be consumed through the resonance effect, thereby achieving the purpose of sound absorption and noise reduction, which is convenient for improving the user experience.

[0056] The following describes a duct-type air conditioner 1 according to a specific embodiment of the present invention with reference to the accompanying drawings.

[0057] In some specific embodiments of the present invention, Figure 1-Figure 4 As shown, the ducted air conditioner 1 includes a housing 10 , a partition 20 , a heat exchanger 30 and a fan assembly 40 .

[0058] In some embodiments of the present invention, Figure 4 As shown, the fan assembly 40 also includes a wind wheel 45, which is rotatably arranged in the air duct 411. When the wind wheel 45 rotates, it drives the air outside the duct air conditioner 1 into the fan chamber 11 from the air inlet 13, so that the air in the fan chamber 11 enters the air duct 411 from the inlet 412 of the air duct 411, and flows along the air duct 411 from the air outlet and the connecting port 21 of the air duct 411 to the heat exchange chamber 12. After the air is heat exchanged in the heat exchanger 30 in the heat exchange chamber 12, it flows from the air outlet 14 to the room to cool or heat the room.

[0059] Among them, because the wind wheel 45 draws air into the air duct 411 when it is working, and the wind wheel 45 works to increase the pressure and then sends it out, during this process, the high-speed rotation of the wind wheel 45 causes the air flow to flow through the wind wheel 45. Due to the influence of the viscous friction of air molecules, the air flow with a certain speed interacts with the relatively static air flow behind the wind wheel 45, forming an air flow with vortices in the downstream area of ​​the wind wheel 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 jumps in pressure propagate outward through the surrounding medium and act on the wind wheel 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.

[0060] That is to say, louder noise is easily generated at the outlet area of ​​the air duct 411, so that a first noise reduction chamber 481 is defined between the cover body 47 and the volute 41, so that the sound waves in the air duct 411 can enter the first noise reduction chamber 481 through the first noise reduction hole 482, and then the sound waves can resonate in the first noise reduction chamber 481 to consume the energy of the sound waves and play a noise reduction role.

[0061] In some embodiments of the present invention, Figure 5 、 Figure 6 As shown, the volute 41 includes a first shell 4101 and a second shell 4102, and an air duct 411 is defined between the first shell 4101 and the second shell 4102. The cover body 47 is arranged on the outside of the first shell 4101 and / or the second shell 4102, so that the cover body 47 and the first shell 4101 and / or the second shell 4102 jointly define a first noise reduction chamber 481, and the first noise reduction hole 482 is used to connect the first noise reduction chamber 481 and the air duct 411, so that the noise in the air duct 411 can enter the first noise reduction chamber 481 through the first noise reduction hole 482, so that the sound waves can resonate in the first noise reduction chamber 481 to consume the energy in the sound waves, thereby playing a noise reduction role.

[0062] In some embodiments, as Figure 5 、 Figure 6As shown, a separation rib 51 is provided between the cover body 47 and the first shell 4101 and / or the second shell 4102 , and the separation rib 51 divides the space between the cover body 47 and the first shell 4101 and / or the second shell 4102 into a plurality of first noise reduction chambers 481 .

[0063] In some examples, a portion of the partition rib 51 extends in the transverse direction, and another portion of the partition rib 51 extends in the longitudinal direction to separate the space between the cover body 47 and the first shell 4101 and / or the second shell 4102 into a plurality of first noise reduction chambers 481 .

[0064] In some examples, such as Figure 5 As shown, the separation rib 51 is integrally formed with the first shell 4101 or the second shell 4102 , and the first noise reduction hole 482 is provided in the first shell 4101 and / or the second shell 4102 .

[0065] In other examples, such as Figure 6 As shown, the separating rib 51 is integrally formed with the cover body 47, and the first noise reduction hole 482 is provided in the first shell 4101 and / or the second shell 4102, wherein the cover body 47 has a small volume and a simple structure, so that the separating rib 51 and the cover body 47 are integrally formed, which facilitates reducing the difficulty of processing.

[0066] In some optional embodiments of the present invention, such as Figure 6 、 Figure 7 As shown, the cover 47 is arranged on the outside of the first shell 4101 . The first shell 4101 extends along the axial direction and the circumferential direction of the wind wheel 45 . The first shell 4101 defines a first air duct wall 422 .

[0067] The partition 20 is arranged on the axial side of the connecting port 21 of the first shell 4101, and the partition 20 extends beyond the end of the first shell 4101. The first end of the cover body 47 is provided with a plug-in protrusion 471, and the part of the partition 20 that exceeds the first shell 4101 is provided with a plug-in groove 24, and the plug-in protrusion 471 is plugged into the plug-in groove 24.

[0068] The outer surface of the first shell 4101 is provided with a mating portion 15, and the mating portion 15 itself or the mating portion 15 and the outer surface of the first shell 4101 together define a snap-fit ​​groove, and at least a portion of the second end of the cover body 47 is suitable for extending into the snap-fit ​​groove to confine the cover body 47 to the outside of the first shell 4101.

[0069] Specifically, when the cover body 47 is fixed on the outer surface of the first shell 4101, the plug-in protrusion 471 at the first end of the cover body 47 is first plugged into the plug-in groove 24, and then the second end of the cover body 47 is pressed toward the direction close to the first air duct wall 422 to deform the matching portion 15 so that the second end of the cover body 47 can smoothly extend into the snap-in groove. After the second end of the cover body 47 extends into the snap-in groove, the matching portion 15 restores its deformation and stops against the second end of the cover body 47 to limit the position of the cover body 47.

[0070] In some embodiments, the partition 20 is integrally formed with the first shell 4101 .

[0071] In some optional embodiments of the present invention, such as Figure 4 As shown, the first shell 4101 includes a first air duct wall 422 , and the second shell 4102 includes a volute tongue 421 . The volute tongue 421 and the first air duct wall 422 are arranged opposite to each other and are located on the peripheral side of the communication port 21 .

[0072] The first air duct wall 422 guides the flow of air, so that the air can flow along the first air duct wall 422 toward the communication port 21 and then smoothly enter the heat exchange chamber 12 through the communication port 21 .

[0073] In some embodiments, as Figure 5 、 Figure 6 As shown, the cover body 47 is disposed on the outside of the first air duct wall 422 and defines a first noise reduction cavity 481 between the cover body 47 and the first air duct wall 422 . The first noise reduction hole 482 is disposed in the first air duct wall 422 .

[0074] Among them, when the air flows along the first air duct wall 422 to the connecting port 21, the noise can easily enter the first noise reduction cavity 481 through the first noise reduction hole 482 on the first air duct wall 422, thereby allowing the sound waves to resonate in the first noise reduction cavity 481 to consume the energy in the sound waves, thereby playing a noise reduction role.

[0075] Specifically, loud noise is easily generated in the outlet area of ​​the air duct 411. The cover body 47 is set on the outside of the first air duct wall 422 to set the first noise reduction cavity 481 close to the outlet of the air duct, thereby facilitating the entry of sound waves into the first noise reduction cavity 481 and improving the noise reduction effect.

[0076] In other embodiments, the cover body 47 is arranged on the outside of the second shell 4102 and defines a first noise reduction cavity 481 between the cover body 47 and the second shell 4102. The first noise reduction hole 482 is arranged in the second shell 4102. The noise in the air duct can enter the first noise reduction cavity 481 through the first noise reduction hole 482 on the second shell 4102, thereby allowing the sound waves to resonate in the first noise reduction cavity 481 to consume the energy in the sound waves, thereby playing a noise reduction role.

[0077] Specifically, when the sound wave resonates in the first noise reduction chamber 481 , the sound energy is consumed in three aspects.

[0078] First, when the sound wave resonates, the air column moves violently, and the air column rubs against the inner wall of the first noise reduction cavity 481, causing local sound energy to be converted into heat energy, thereby consuming sound energy.

[0079] Second aspect: the incident sound wave will diffuse at the first noise reduction hole 481, causing the sound wave energy to be dispersed to a wider area, thereby reducing the concentrated propagation of the sound wave and reducing the impact of noise on a specific area.

[0080] Third, when the air inside the first noise reduction chamber 481 vibrates, the pressure inside the chamber changes, storing energy. This energy storage allows the Helmholtz resonator to continue vibrating for a period of time after the sound waves stop, extending its noise reduction time.

[0081] In some specific embodiments of the present invention, the cover body 47 is arranged on the outside of the second shell 4102 and defines a first noise reduction cavity 481 between the cover body 47 and the second shell 4102. The cover body 47 is at least partially arranged opposite to the volute tongue 421 to define at least a portion of the first noise reduction cavity 481 between the cover body 47 and the volute tongue 421, and at least a portion of the first noise reduction hole 482 is arranged on the volute tongue 421.

[0082] Among them, when the duct air conditioner 1 is cooling or heating, a large noise will be generated in the area near the snail tongue 421 at the outlet of the air duct 411, so that a first noise reduction cavity 481 is defined between the cover body 47 and the snail tongue 421, so that the sound waves at the snail tongue 421 can enter the first noise reduction cavity 481 through the first noise reduction hole 482, and then the sound waves can resonate in the first noise reduction cavity 481 to consume the energy of the sound waves, thereby playing a noise reduction role and improving the noise reduction effect.

[0083] In some embodiments of the present invention, Figure 2 As shown, the air inlet 13 includes a first air inlet 131 and a second air inlet 132. The first air inlet 131 is arranged on the bottom wall of the outer shell 10, and the second air inlet 132 is arranged on the side wall of the outer shell 10 opposite to the partition 20. Driven by the fan assembly 40, air enters the fan cavity 11 from the lower side and rear side of the duct air conditioner 1.

[0084] Specifically, air is allowed to enter the fan cavity 11 from different directions of the housing 10 , thereby increasing the air intake volume of the duct air conditioner 1 and further improving the cooling or heating efficiency of the duct air conditioner 1 .

[0085] The bottom wall of the housing 10 is provided with a wind shield 60, which is used to block a portion of the first air inlet 131 to hinder the propagation of noise, thereby reducing the noise transmitted into the room during use of the duct air conditioner 1.

[0086] Specifically, during the cooling or heating process of the duct air conditioner 1, noise will be generated, and the noise can easily be transmitted directly from the first air inlet 131 to the indoor room. A wind shield 60 is provided at the first air inlet 131, so that the wind shield 60 blocks a part of the first air inlet 131. When noise is transmitted to the wind shield 60, the wind shield 60 can at least block the transmission of part of the noise, thereby reducing the noise transmitted to the indoor room. After being blocked by the wind shield 60, the noise returns to the air duct 411, so as to make full use of the first noise reduction chamber 481 to reduce the noise in the air duct 411.

[0087] In addition, since the wind shield 60 blocks a portion of the first air inlet 131, it is easy to affect the air intake at the first air inlet 131. Therefore, the utility model adds a second air inlet 132 on the outer shell 10 to compensate for the influence of the wind shield 60 on the air intake at the first air inlet 131, thereby ensuring the air intake of the duct air conditioner 1 and ensuring the cooling or heating efficiency of the duct air conditioner 1.

[0088] In some embodiments of the present invention, Figure 4 As shown, 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 located on the peripheral side of the connecting port 21 and are both connected to the partition 20. The volute tongue 421 is located below the first air duct wall 422. The wind shield 60 is arranged close to the partition 20 and opposite to the volute tongue 421, so that the wind shield 60 is arranged in an area with higher noise, and then the wind shield 60 is used to block the spread of more noise as much as possible.

[0089] 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 this 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 in the area of ​​the outlet 413 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.

[0090] That is to say, when the wind wheel 45 rotates, the noise generated at the outlet 413 of the air duct 411 is relatively large, and the volute tongue 421 is arranged close to the bottom wall of the outer shell 10. The larger noise near the volute tongue 421 can be easily transmitted into the room through the first air inlet 131. Therefore, the wind shield 60 and the volute tongue 421 are arranged opposite to each other to use the wind shield 60 to block the propagation of noise near the volute tongue 421, thereby reducing the noise transmitted into the room, thereby improving the user experience.

[0091] like Figure 4 As shown, in this embodiment, the first air duct wall 422 and the volute tongue 421 are relatively arranged in the up and down directions (it should be understood here that the above 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), and the wind shield 60 is located directly below the volute tongue 421 to prevent the noise near the volute tongue 421 from being transmitted downward through the first air inlet 131 into the room, thereby facilitating the reduction of the noise transmitted into the room by the duct air conditioner 1 when working, thereby improving the user experience.

[0092] In some optional embodiments of the present invention, on the plane where the bottom wall of the outer shell 10 is located, the projection of the snail tongue 421 is located within the projection of the wind shield 60, so as to improve the noise blocking effect of the wind shield 60, thereby enabling the wind shield 60 to block as much noise as possible from being transmitted from the first air inlet 131 to the room.

[0093] In some embodiments, a sound-absorbing or noise-reducing component is provided in the fan cavity 11. When the noise at the volute tongue 421 propagates downward, the wind shield 60 can prevent the noise from propagating downward and allow the noise to propagate into the fan cavity 11, so as to utilize the sound-absorbing or noise-reducing component to reduce the sound energy, thereby achieving a noise reduction effect.

[0094] In some optional embodiments of the present invention, the wind shield 60 has a transverse dimension of 20 mm to 45 mm.

[0095] Among them, the horizontal dimension of the wind shield 60 is greater than or equal to 20 mm, so that the wind shield 60 has a certain horizontal dimension to ensure that the wind shield 60 blocks noise and avoids excessive noise at the outlet 413 of the air duct 411 from being directly transmitted to the room from the first air inlet 131.

[0096] The lateral dimension of the wind shield 60 is made less than or equal to 45 mm to avoid the lateral dimension of the wind shield 60 being too large and to avoid the wind shield 60 excessively obstructing the air from entering the fan cavity 11 from the first air inlet 131, so as to ensure the air intake volume of the duct air conditioner 1 and ensure the cooling or heating effect of the duct air conditioner 1.

[0097] Specifically, the lateral dimension of the wind shield 60 may be 20 mm, 25 mm, 30 mm, 40 mm or 45 mm, without further limitation.

[0098] In some optional embodiments of the present invention, such as Figure 2 、 Figure 3 As shown, the volute tongue 421 extends longitudinally, the length direction of the wind shield 60 extends longitudinally, and the two ends of the wind shield 60 in the longitudinal direction are connected to the two side walls of the shell 10 that are arranged opposite to each other in the longitudinal direction, so as to avoid noise from leaking into the room from the gap between the wind shield 60 and the two side walls of the shell 10 in the longitudinal direction, thereby ensuring the noise blocking effect of the wind shield 60, so that the wind shield 60 can reduce the noise transmitted to the room through the first air inlet 131 as much as possible, thereby reducing the noise transmitted to the room by the duct air conditioner 1 when working, so as to improve the user experience.

[0099] In some optional embodiments of the present invention, the wind shield 60 is a wind shield, and the vertical dimensions of the wind shield are consistent. That is to say, the wind shield is a plate-mounted structure with a simple structure. By using a wind shield with a simple structure, the noise transmitted to the room by the duct air conditioner 1 can be reduced, thereby improving the user experience.

[0100] In other optional embodiments of the present invention, Figure 4As shown, the vertical dimension of the wind shield 60 gradually decreases in the direction approaching the partition 20, so that it is convenient to set a noise reduction part or a silencer in the area with a larger vertical dimension of the wind shield 60, so that the wind shield 60 can not only prevent the noise from propagating into the room, but also play a role in noise reduction.

[0101] In addition, the vertical dimension of the wind shield 60 is gradually reduced in the direction approaching the partition 20 , which is convenient for reducing consumables on the one hand and for reducing the space occupied by the wind shield 60 in the fan chamber 11 on the other hand.

[0102] In some embodiments, as Figure 4 As shown, the windshield 60 extends laterally in the front-to-back direction. The windshield 60 includes a first part 601 and a second part 602. The first part 601 and the second part 602 are arranged in the front-to-back direction. The front end of the first part 601 is connected to the outer shell 10, and the rear end is connected to the second part 602.

[0103] The vertical dimension of the second part 602 is larger than the vertical dimension of the first part 601. The second part 602 is provided with a noise reduction part or a sound absorbing part. The wall surface of the second part 602 facing the fan assembly 40 is connected to the wall surface of the first part 601 facing the fan assembly 40 by an arc transition to avoid forming an angle at the wall of the wind shield 60 facing the fan assembly 40, so as to avoid air gathering at the angle between the first part 601 and the second part 602.

[0104] In some embodiments of the present invention, Figure 4 As shown, the wind shield 60 defines a second noise reduction cavity 61. A second noise reduction hole is provided on the side of the wind shield 60 facing the fan cavity 11. The second noise reduction hole connects the second noise reduction cavity 61 and the fan cavity 11. The noise in the fan cavity 11 can enter the second noise reduction cavity 61 through the second noise reduction hole, causing the noise to resonate in the second noise reduction cavity 61, thereby consuming sound energy and playing a role in noise reduction.

[0105] like Figure 4 As shown, in this embodiment, the wind shield 60 extends laterally along the front-to-back direction, and includes a first part 601 and a second part 602. The first part 601 and the second part 602 are arranged along the front-to-back direction. The front end of the first part 601 is connected to the outer shell 10, and the rear end is connected to the second part 602.

[0106] The second portion 602 has a larger vertical dimension than the first portion 601. The second portion 602 defines a second noise reduction cavity 61 and a second noise reduction hole. The second noise reduction cavity 61 is connected to the fan cavity 11 through at least one second noise reduction hole.

[0107] The flow area of ​​the second noise reduction hole is smaller than the flow area of ​​the second noise reduction cavity 61. The second noise reduction hole and the second noise reduction cavity 61 can cooperate to form a Helmholtz resonator. When the air in the fan cavity 11 flows from the second noise reduction hole into the second noise reduction cavity 61, since the flow area of ​​the second noise reduction cavity 61 is larger than the flow area of ​​the second noise reduction hole, the flow velocity of the air in the second noise reduction cavity 61 is much smaller than the flow velocity of the local airflow in the center of the second noise reduction cavity 61, thereby forming a more violent shear flow in the second noise reduction cavity 61, accompanied by unstable disturbance waves. At the same time, if the air column in the second noise reduction hole is affected When the disturbance moves into the second noise reduction chamber 61, the gas in the second noise reduction chamber 61 is compressed and the pressure increases. At this time, the air in the second noise reduction hole 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 second noise reduction chamber 61. In turn, the air column in the second noise reduction hole stops moving outward and moves inward again, over and over again. When the frequency of the disturbance wave matches the incoming frequency of the air, a resonance phenomenon is formed, which consumes sound energy, thereby reducing or eliminating noise to achieve the purpose of noise reduction.

[0108] It should be noted that the resonant frequency of a Helmholtz resonator depends on its geometry and volume. Therefore, the flow area of ​​the noise reduction hole and / or the flow area of ​​the noise reduction cavity can be adjusted based on the frequency of the noise to be eliminated. In other words, the combination of the second noise reduction hole and the second noise reduction cavity 61 can absorb noise of a specific frequency, achieving the purpose of noise reduction, reducing the noise generated by the fan assembly 40 during operation to a certain extent, and improving the user experience.

[0109] Specifically, the noise frequency to be eliminated S is the cross-sectional area of ​​the second noise reduction hole, S = πD 2 / 4, V is the volume of the second noise reduction cavity 61, L is the length of the second noise reduction hole (for details, see Figure 13 ).

[0110] Based on this, in a specific example, 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 61 or the length of the second noise reduction hole.

[0111] In some embodiments, the wind shield defines a plurality of second noise reduction cavities 61, each second noise reduction cavity 61 is connected to the fan cavity 11 through at least one second noise reduction hole, some of the second noise reduction cavities 61 have the same volume, some of the second noise reduction cavities 61 have different volumes, some of the second noise reduction holes have the same cross-sectional area, and some of the second noise reduction holes have different cross-sectional areas, so that the plurality of second noise reduction cavities 61 can play a noise reduction role within a wider frequency range.

[0112] In the embodiment where the second noise reduction cavity 61 is connected to the fan cavity 11 through multiple second noise reduction holes, the cross-sectional area S and the length L of the multiple second noise reduction holes connected to the same second noise reduction cavity 61 are the same.

[0113] In some embodiments of the present invention, Figure 2 As shown, the outer shell 10 includes a shell body 101 and an air inlet frame 102, the partition 20 is arranged in the shell body 101, the air inlet frame 102 is arranged on the side of the shell body 101 and is arranged opposite to the partition 20 in the horizontal direction, the fan cavity 11 is located between the air inlet frame 102 and the partition 20, and the second air inlet 132 is arranged on the air inlet frame 102, so that air can enter the fan cavity 11 from the second air inlet 132 on the air inlet frame 102, thereby facilitating the increase of the air intake volume of the duct air conditioner 1, thereby improving the cooling or heating efficiency of the duct air conditioner 1.

[0114] In some embodiments, as Figure 2 As shown, it extends laterally in the front-to-back direction, the air inlet frame 102 is arranged at the rear of the shell body 101, the second air inlet 132 defines the rear air inlet of the duct air conditioner 1, and the first air inlet 131 defines the lower air inlet of the duct air conditioner 1. Driven by the fan assembly 40, the duct air conditioner 1 drives external air into the fan cavity 11 from the lower air inlet and the rear air inlet.

[0115] The air outlet 14 is located at the front side of the heat exchange chamber 12 , and the duct-type air conditioner 1 blows the heat-exchanged air from the front side into the room to cool or heat the room.

[0116] In some optional embodiments of the present invention, such as Figure 8 As shown, there are multiple second air inlets 132, and the multiple second air inlets 132 are arranged in the length direction and / or width direction of the air inlet frame 102, which makes it easy to increase the air inlet area, thereby increasing the air intake volume of the duct air conditioner 1 and improving the cooling or heating effect of the duct air conditioner 1.

[0117] In some embodiments, as Figure 9 As shown, the plurality of second air inlets 132 are separated by reinforcing ribs 105 , which facilitates increasing the structural strength of the air inlet frame 102 .

[0118] In some embodiments, as Figure 11 、 Figure 12 As shown, the diameters of the multiple first air inlets 131 can be the same or different, and there are no excessive restrictions here.

[0119] In some embodiments, as Figure 9 、 Figure 11 and Figure 12As shown, the number of the second air inlets 132 can be two, three, four or more, and there is no excessive restriction here.

[0120] In some optional embodiments of the present invention, such as Figure 10 As shown, the air inlet frame 102 has an air guide flange 103 extending toward the fan cavity 11. The air guide flange 103 is an annular flange extending circumferentially along the second air inlet 132. The air guide flange 103 guides the air entering the fan cavity 11 from the second air inlet 132, thereby facilitating the improvement of the efficiency of air entering from the second air inlet 132 and increasing the air intake volume of the duct air conditioner 1.

[0121] In some implementations, the air guiding flange 103 extends obliquely toward the direction close to the partition 20 and the central axis of the second air inlet 132 to guide the air entering the fan cavity 11 from the second air inlet 132 .

[0122] In some embodiments, as Figure 10 As shown, the air inlet frame 102 also includes a fixed flange 104, which is located on one side of the air inlet frame 102 in the horizontal direction. The fixed flange 104 extends longitudinally. The fixed flange 104 is suitable for cooperating with the shell body 101 to increase the matching area between the air inlet frame 102 and the shell body 101, thereby facilitating the use of fasteners to fix the air inlet frame 102 on the shell body 101.

[0123] In some optional embodiments of the present invention, such as Figure 4 、 Figure 6 As shown, the partition 20 is suitable for defining a third noise reduction chamber 22, and a third noise reduction hole 23 is provided on the partition 20. The third noise reduction chamber 22 is connected with the connecting port 21 or the fan chamber 11 through the third noise reduction hole 23. The noise at the connecting port 21 or in the fan chamber 11 can enter the third noise reduction chamber 22 through the third noise reduction hole 23, causing the noise to resonate in the third noise reduction chamber 22, thereby consuming sound energy and playing a role in noise reduction.

[0124] Among them, the noise reduction principle of the third noise reduction cavity 22 is the same as that of the first noise reduction cavity 481 and the second noise reduction cavity, and will not be repeated here.

[0125] In a specific example, noise reduction of different frequencies can be achieved by adjusting the cross-sectional area of ​​the third noise reduction hole 23 , the volume of the third noise reduction cavity 22 , or the length of the third noise reduction hole 23 .

[0126] In some specific embodiments of the present invention, the third noise reduction hole is arranged on the wall of the partition 20 close to the first air duct wall 422, and the third noise reduction hole is located on the inner wall of the connecting port 21, so that the third noise reduction hole connects the third noise reduction cavity and the connecting port 21, and thus the noise at the connecting port 21 can enter the third noise reduction cavity through the third noise reduction hole.

[0127] In some embodiments, the at least one third noise reduction chamber is located on a side of the partition 20 facing away from the communication port 21 .

[0128] For example, the volute 41 is located at the rear side of the partition 20 , the communication port 21 is located near the middle of the partition 20 , and the third noise reduction chamber is located at the upper part or the lower part of the partition 20 .

[0129] In some embodiments, a portion of at least one third noise reduction chamber is located on the side of the partition 20 away from the connecting port 21 and another portion is located on the side of the first air duct wall 422 away from the air duct 411, so as to utilize limited space to define a larger third noise reduction chamber, so as to utilize multiple third noise reduction chambers to reduce noise in a wider frequency range, thereby achieving a better noise reduction effect.

[0130] In some other specific embodiments of the present invention, Figure 5 、 Figure 6 As shown, the third noise reduction hole 23 is arranged on the side of the partition 20 facing the fan cavity 11, that is, the third noise reduction hole 23 is arranged on the inner wall of the fan cavity 11, so that the third noise reduction hole 23 is used to connect the third noise reduction cavity 22 and the fan cavity 11, so that the noise in the fan cavity 11 can enter the third noise reduction cavity 22 through the third noise reduction hole 23.

[0131] In addition, when the noise at the volute tongue 421 propagates downward, the wind shield 60 can prevent the noise from propagating downward and make the noise propagate into the fan cavity 11. The noise in the fan cavity 11 can enter the third noise reduction cavity 22 through the third noise reduction hole 23, so as to consume the energy in the noise and achieve the effect of noise reduction.

[0132] In some embodiments of the present invention, there are multiple third noise reduction chambers 22 and third noise reduction holes 23, a part of the third noise reduction chambers are connected to the connecting port 21 through the third noise reduction holes, and another part of the third noise reduction chambers 22 are connected to the fan chamber 11 through the third noise reduction holes 23.

[0133] In some specific embodiments of the present invention, there are multiple third noise reduction chambers 22, and at least a portion of the third noise reduction chambers 22 are arranged in the longitudinal direction, so as to utilize multiple third noise reduction chambers 22 to reduce the sound energy of the noise at the connecting port 21 or the fan chamber 11, thereby playing a noise reduction role.

[0134] At least one third noise reduction cavity 22 extends in the transverse direction, so as to utilize limited space to define a third noise reduction cavity 22 of appropriate volume, thereby improving the noise reduction effect of the plurality of third noise reduction cavities 22 .

[0135] In some optional embodiments of the present invention, such as Figure 4As 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.

[0136] 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.

[0137] In some specific embodiments of the present invention, the noise reduction principles of the first noise reduction chamber 481, the second noise reduction chamber 61 and the third noise reduction chamber 22 are the same. Here, the first noise reduction chamber 481, the second noise reduction chamber 61 and the third noise reduction chamber 22 are collectively referred to as noise reduction chambers, and the first noise reduction hole 482, the second noise reduction hole and the third noise reduction hole 23 are referred to as noise reduction holes. By designing the hole cross-sectional area S of a single noise reduction hole of the noise reduction chamber, the depth L of the noise reduction hole and the number x of noise reduction holes of the noise reduction chamber, a better noise reduction effect can be achieved.

[0138] Specifically, it is said here that multiple noise reduction cavities form a complete sound absorption structure, that is, multiple first noise reduction cavities 482 form a sound absorption structure, multiple second noise reduction cavities 61 form a sound absorption structure, and multiple third noise reduction cavities 22 form a sound absorption structure. The acoustic impedance Z of the sound absorption structure satisfies:

[0139] where Z HH The acoustic impedance of a single noise reduction cavity is Z, and n is the number of the noise reduction cavity. HH satisfy:

[0140]

[0141] The volume of the noise reduction cavity is V, the cross-sectional area of ​​a single noise reduction hole in the noise reduction cavity is S, and the surface area of ​​the inner side of the opening of the noise reduction cavity is S. ca The depth of the noise reduction cavity is L, the number of noise reduction holes connected to a single noise reduction cavity is x, and the thickness of the volute wall is l u .

[0142] j represents the imaginary part of the complex number, j = sqrt(-1), ρ0 is the air density, c0 is the speed of sound in air, ω is the circular frequency of noise, and η is the air dynamic viscosity.

[0143] A is the surface area of ​​the surface on which the noise reduction chamber is provided. For example, for the first noise reduction chamber 482, A is the surface area of ​​the first shell 4101, the second shell 4102, or the cover 47 provided with the first noise reduction chamber 482. For the second noise reduction chamber 61, A is the surface area of ​​the surface of the wind shield 60 provided with the second noise reduction chamber 61. For the third noise reduction chamber 22, A is the surface area of ​​the surface of the partition 20 provided with the third noise reduction chamber 23. Exceptionally, in an embodiment in which a portion of the third noise reduction chamber 22 is located on the side of the partition 20 away from the connecting port 21 and the other portion is located on the side of the first air duct wall 422 away from the air duct 411, A is the sum of the surface areas of the third noise reduction chamber 22 of the partition 20 and the first air duct wall 422.

[0144] ρ ca 、c ca and k ca Represent the density, sound speed and wave number of the air in the noise reduction chamber, k ap , Ψ va and Ψ ha are the wave number, viscosity term and thermal term of the annular constriction under narrow acoustics, γ is the specific heat of air, δ is the sound mass correction coefficient, and τ is the sound volume correction coefficient.

[0145] The vertical incident sound absorption coefficient α of the sound absorbing structure can be calculated by the following formula:

[0146]

[0147] 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 of the noise reduction cavity, the depth L of the noise reduction hole, and the number x of noise reduction holes connected to the single noise reduction cavity, a larger incident sound absorption coefficient α can be obtained, thereby making the noise reduction efficiency of the sound-absorbing structure higher.

[0148] In addition, for the volume V of the noise reduction cavity, the cross-sectional area S of a single noise reduction hole, and the surface area S of the inner side of the opening of the noise reduction cavity, ca The number x of noise reduction holes connected to a single noise reduction cavity can be taken within the following range to effectively reduce noise of 400 Hz-2000 Hz.

[0149] 500mm 3 ≤V≤64000mm 3

[0150] 1.44mm 2 ≤S≤100mm 2

[0151] 100mm 2 ≤S ca ≤1600mm 2

[0152] 1≤x≤9

[0153] For the volute wall thickness l u The values ​​of the depth L of the noise reduction hole, the volume V of the noise reduction cavity, and the cross-sectional area S of a single noise reduction hole can follow the following formula to effectively reduce the noise of 400hz-2000hz.

[0154] l u ≤L≤V / S ca *0.5

[0155] Other structures and operations of the duct-type air conditioner 1 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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 having an air inlet and an air outlet; a partition disposed in the housing to divide the inner cavity of the housing into a heat exchange cavity and a fan cavity arranged in a transverse direction, wherein the partition defines a communication port, the heat exchange cavity is communicated with the air outlet, and the fan cavity is communicated with the air inlet; a heat exchanger, the heat exchanger being disposed in the 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 via the communication port; In which, the fan assembly includes a volute and a cover, the volute defines the air duct, the outlet of the air duct and the heat exchange chamber are connected through the connecting port, the cover is arranged on the outside of the volute and defines a first noise reduction chamber between the volute and the volute, the volute is provided with a first noise reduction hole, and the first noise reduction hole connects the first noise reduction chamber and the air duct.

2. The duct type air conditioner according to claim 1, characterized in that: The volute includes a first shell and a second shell, the air duct is defined between the first shell and the second shell, and the cover is arranged on the outside of the first shell and / or the second shell.

3. The duct type air conditioner according to claim 2, characterized in that: The first shell includes a first air duct wall, and the second shell includes a volute tongue, wherein the volute tongue and the first air duct wall are arranged opposite to each other and are located around the communication port; The cover is arranged on the outside of the first air duct wall and defines the first noise reduction cavity between the cover and the first air duct wall, and the first noise reduction hole is arranged on the first air duct wall; Alternatively, the cover is arranged on the outside of the second shell and defines the first noise reduction cavity between the cover and the second shell, and the first noise reduction hole is arranged in the second shell.

4. The duct type air conditioner according to claim 3, characterized in that: The cover is arranged on the outside of the second shell and defines the first noise reduction cavity between the cover and the second shell. The cover is at least partially arranged opposite to the volute tongue, and at least a part of the first noise reduction holes is arranged on the volute tongue.

5. The duct type air conditioner according to claim 1, characterized in that: The air inlet portion includes a first air inlet and a second air inlet. The first air inlet is arranged on the bottom wall of the shell. The bottom wall of the shell is provided with a wind shield for covering a part of the first air inlet. The second air inlet is arranged on the side wall of the shell opposite to the partition.

6. The duct type air conditioner according to claim 5, characterized in that: The volute includes a volute tongue and a first air duct wall, the volute tongue and the first air duct wall are located on the peripheral side of the connecting port and are both connected to the partition, the volute tongue is located below the first air duct wall, and the wind shield is arranged close to the partition and opposite to the volute tongue.

7. The duct type air conditioner according to claim 6, characterized in that: On the plane where the bottom wall of the shell is located, the projection of the volute tongue is located within the projection of the wind shield.

8. The duct type air conditioner according to claim 6, characterized in that: The wind shield has a dimension in the transverse direction of 20 mm to 45 mm.

9. The duct type air conditioner according to claim 6, characterized in that: The volute tongue extends in a longitudinal direction, the length direction of the wind shield extends in the longitudinal direction, and both ends of the wind shield in the longitudinal direction are connected to two side walls of the housing that are oppositely arranged in the longitudinal direction.

10. The duct type air conditioner according to claim 6, characterized in that: The windshield member is a windshield plate, and the windshield plates have consistent dimensions in the vertical direction.

11. The duct type air conditioner according to claim 6, characterized in that: The vertical dimension of the wind shield gradually decreases in a direction approaching the partition.

12. The duct-type air conditioner according to any one of claims 5 to 11, characterized in that: The wind shield defines a second noise reduction cavity. A second noise reduction hole is provided on a side of the wind shield facing the fan cavity. The second noise reduction hole communicates with the second noise reduction cavity and the fan cavity.

13. The duct-type air conditioner according to any one of claims 5 to 11, characterized in that: The housing comprises: a shell body, wherein the partition is arranged in the shell body; An air inlet frame is provided at a side of the shell body and is arranged opposite to the partition in the transverse direction, the fan cavity is located between the air inlet frame and the partition, and the second air inlet is provided at the air inlet frame.

14. The duct type air conditioner according to claim 13, characterized in that: There are multiple second air inlets, and the multiple second air inlets are arranged in the length direction and / or width direction of the air inlet frame.

15. The duct type air conditioner according to claim 13, characterized in that: The air inlet frame has an air guide flange extending toward the fan cavity, and the air guide flange is an annular flange extending along the circumference of the second air inlet.

16. The duct-type air conditioner according to any one of claims 1 to 11, characterized in that: The partition is suitable for defining a third noise reduction cavity, and a third noise reduction hole is provided on the partition. The third noise reduction cavity is communicated with the communication port or the fan cavity through the third noise reduction hole.

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