Air pipe type air conditioner

Abstract

The utility model discloses an air pipe type air conditioner which comprises a shell, a heat exchanger, a fan assembly and a flow guide piece, a fan cavity and a heat exchange cavity are defined by the shell, the heat exchanger is arranged in the heat exchange cavity, and the fan assembly is arranged in the fan cavity and comprises a motor, a first volute, a first wind wheel arranged in the first volute, a second volute and a second wind wheel arranged in the second volute. The first volute and the second volute are arranged in the longitudinal direction, the motor is arranged between the first volute and the second volute and used for driving the first wind wheel and the second wind wheel to rotate, the flow guide part is arranged on the outer side of a shell of the motor and located between an inlet of the first volute and an inlet of the second volute, and the flow guide part is provided with a noise reduction structure. According to the air duct type air conditioner provided by the embodiment of the utility model, the noise reduction structure is arranged on the flow guide part, and can be used for reducing the noise of the air flow in the flowing process of the air flow, so that the working noise of the air duct type air conditioner is reduced on the basis of not increasing the size of the whole machine, and the use experience of a user is improved.

Description

Technical Field

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

[0002] Most duct air conditioners 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, one object of the present invention is to provide a ducted air conditioner that, by providing a noise reduction structure on a flow guide, can reduce the noise of the airflow, thereby reducing the operating noise of the ducted air conditioner and improving the user experience.

[0004] According to the embodiment of the utility model, the duct-type air conditioner includes: a shell, the shell defines a fan cavity and a heat exchange cavity arranged in the transverse direction, the shell has an air inlet and an air outlet, the air inlet is connected to the fan cavity, and the air outlet is connected to the heat exchange cavity; a heat exchanger, the heat exchanger is arranged in the heat exchange cavity; a fan assembly, the fan assembly is arranged in the fan cavity and includes a motor, a first volute, a first wind wheel arranged in the first volute, a second volute, and a second wind wheel arranged in the second volute, the first volute and the second volute are arranged in the longitudinal direction, the motor is arranged between the first volute and the second volute, and is used to drive the first wind wheel and the second wind wheel to rotate; a guide member, the guide member is arranged outside the casing of the motor and is located between the inlet of the first volute and the inlet of the second volute, and the guide member has a noise reduction structure.

[0005] According to the duct-type air-conditioner of the embodiment of the present invention, a flow guide is provided on the outside of the motor housing so that the airflow entering the fan cavity from the air inlet can be diverted under the action of the flow guide. A part of the airflow can enter the first volute from the inlet of the first volute under the drive of the first wind wheel, and the other part of the airflow can enter the second volute from the inlet of the second volute under the drive of the second wind wheel, thereby avoiding the motor blocking the inlet of the first volute and the inlet of the second volute, affecting the air intake effect of the inlet of the first volute and the air intake effect of the inlet of the second volute; by providing a noise reduction structure on the flow guide, the noise reduction structure can reduce the noise of the airflow during the flow of the airflow, thereby reducing the working noise of the duct-type air-conditioner without increasing the size of the whole machine, thereby improving the user experience.

[0006] According to some embodiments of the present invention, the flow guide has an avoidance gap for avoiding the shell, and the shape of the avoidance gap is adapted to the shape of the peripheral wall of the shell.

[0007] According to some embodiments of the present invention, the air inlet is provided on the bottom wall of the shell, and the flow guide is provided on a side of the shell facing the bottom wall.

[0008] In some embodiments, the guide member is spaced apart from the bottom wall, and the guide member has a first guide surface and a second guide surface arranged in opposite directions on the side facing the bottom wall, the first guide surface extends from bottom to top toward the direction close to the inlet of the first volute, and the second guide surface extends from bottom to top toward the direction close to the inlet of the second volute.

[0009] In some examples, the first guide surface and the second guide surface are both arc surfaces, and the two are connected by an arc transition.

[0010] According to some embodiments of the present invention, a partition 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 outer shell also includes a first side wall, and the first side wall and the partition are arranged opposite to each other in the transverse direction, and the fan cavity is located between the first side wall and the partition, and the length direction of the guide member extends along the transverse direction, and one end of the length direction extends toward the partition, and the other end of the length direction extends toward the first side wall.

[0011] According to some embodiments of the present invention, the flow guide is detachably fixed to the outside of the shell and / or the cavity wall of the fan cavity.

[0012] According to some embodiments of the present invention, a first connecting lug is provided on the guide member near the first volute, a first connecting column is provided on the outside of the shell, and the first connecting lug and the first connecting column are connected by a first fastener; and / or, a second connecting lug is provided on the guide member near the second volute, a second connecting column is provided on the outside of the shell, and the second connecting lug and the second connecting column are connected by a second fastener.

[0013] According to some embodiments of the present invention, the flow guide is integrally formed with at least a portion of the shell.

[0014] According to some embodiments of the present invention, the noise reduction structure includes a first noise reduction cavity and a first noise reduction hole. The flow guide member defines the first noise reduction cavity. The first noise reduction hole is located on the wall opposite to the inlet of the flow guide member and the first volute. The first noise reduction hole connects the space between the flow guide member and the inlet of the first volute with the first noise reduction cavity.

[0015] In some embodiments, there are multiple first noise reduction cavities and multiple first noise reduction holes, and each first noise reduction cavity corresponds to and is connected to at least one first noise reduction hole.

[0016] In some embodiments, the noise reduction structure also includes a second noise reduction cavity and a second noise reduction hole. The flow guide member defines a second noise reduction cavity. The second noise reduction hole is located on the wall opposite to the inlet of the flow guide member and the second volute. The second noise reduction hole connects the space between the flow guide member and the inlet of the second volute with the second noise reduction cavity.

[0017] In some embodiments, there are multiple second noise reduction cavities and multiple second noise reduction holes, and each second noise reduction cavity corresponds to and is connected to at least one second noise reduction hole.

[0018] In some embodiments, the thickness direction of the guide member extends along the longitudinal direction, the first noise reduction cavity and the second noise reduction cavity are arranged in the thickness direction of the guide member, and a partition wall is provided inside the guide member, which separates the first noise reduction cavity and the second noise reduction cavity.

[0019] According to some embodiments of the present invention, the fan assembly also includes a third volute, a third wind wheel arranged in the third volute, and the second volute is located between the first volute and the third volute; the first wind wheel, the second wind wheel and the third wind wheel are coaxially arranged, the first wind wheel is connected to the first output shaft of the motor through a first connecting shaft, the second wind wheel is connected to the second output shaft of the motor through a second connecting shaft, and the second connecting shaft is also connected to the third wind wheel.

[0020] 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

[0021] 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:

[0022] Figure 1 This is a cross-sectional view of the structure of a duct-type air conditioner according to one embodiment of the present utility model;

[0023] Figure 2 This is a structural diagram of a duct-type air conditioner according to an embodiment of the present utility model;

[0024] Figure 3 yes Figure 2 A perspective view of a ducted air conditioner as shown in FIG;

[0025] Figure 4 yes Figure 3 An enlarged view of section A shown in FIG;

[0026] Figure 5 yes Figure 3 A structural cross-sectional view of the guide member shown in ;

[0027] Figure 6 This is a schematic diagram of the principle of the Helmholtz resonator;

[0028] Figure 7 It is a structural schematic diagram of a duct-type air conditioner according to another embodiment of the utility model.

[0029] Reference numerals:

[0030] Duct air conditioner 100,

[0031] Housing 10, fan chamber 101, heat exchange chamber 102, air inlet 103, air outlet 104, first side wall 11, bottom wall 12, top wall 13,

[0032] Heat exchanger 20,

[0033] Fan assembly 30, motor 31, housing 311, first output shaft 3121, second output shaft 3122, first connecting shaft 3131, second connecting shaft 3132, bracket 314, first volute 321, first wind wheel 322, second volute 331, second wind wheel 332, third volute 341, third wind wheel 342,

[0034] The guide member 40, the avoidance gap 41, the first guide surface 421, the second guide surface 422, the first noise reduction cavity 441, the first noise reduction hole 442, the second noise reduction cavity 451, the second noise reduction hole 452, the partition wall 46,

[0035] Partition 50 and communication port 51 . DETAILED DESCRIPTION

[0036] The following describes in detail embodiments of the present invention. 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.

[0037] Reference below Figure 1-Figure 7 A duct-type air conditioner 100 according to an embodiment of the present invention is described.

[0038] like Figure 1-Figure 3As shown, the duct type air conditioner 100 according to the embodiment of the present invention includes a housing 10, which defines a fan cavity 101 and a heat exchange cavity 102. The fan cavity 101 and the heat exchange cavity 102 are arranged in a horizontal direction (such as Figure 1 The housing 10 has an air inlet 103 and an air outlet 104. The air inlet 103 is connected to the fan cavity 101, and the air outlet 104 is connected to the heat exchange cavity 102.

[0039] The duct air conditioner 100 further includes a heat exchanger 20 and a fan assembly 30. The heat exchanger 20 is disposed in the heat exchange cavity 102. The fan assembly 30 is disposed in the fan cavity 101. The fan assembly 30 includes a motor 31, a first volute 321, a first wind wheel 322, a second volute 331, and a second wind wheel 332. The first wind wheel 322 is disposed in the first volute 321, and the second wind wheel 332 is disposed in the second volute 331. The first volute 321 and the second volute 331 are longitudinally (e.g., Figure 2 and Figure 3 The first and second wind wheels 322 and 332 are arranged in the longitudinal direction, and the motor 31 is provided between the first volute 321 and the second volute 331 for driving the first and second wind wheels 322 and 332 to rotate.

[0040] For example, the motor 31 has a first output shaft 3121 and a second output shaft 3122. The first output shaft 3121 of the motor 31 can be directly or indirectly connected to the first wind wheel 322, so that the motor 31 can drive the first wind wheel 322 to rotate. The second output shaft 3122 of the motor 31 can be directly or indirectly connected to the second wind wheel 332, so that the motor 31 can drive the second wind wheel 332 to rotate.

[0041] Furthermore, the duct air conditioner 100 further includes a flow guide 40 , which is disposed outside the housing 311 of the motor 31 , and is located between the inlet of the first volute 321 and the inlet of the second volute 331 .

[0042] Specifically, when the duct air conditioner 100 is in operation, the first wind wheel 322 and the second wind wheel 332 both rotate, which can drive the air outside the outer shell 10 into the fan chamber 101 from the air inlet 103. The airflow enters the first volute 321 and the second volute 331 respectively under the guidance of the guide member 40, and is transported to the heat exchange chamber 102 after being pressurized by the first wind wheel 322 and the second wind wheel 332 to exchange heat with the heat exchanger 20, and finally discharged from the air outlet 104 and sent to the indoor space to adjust the temperature of the indoor space.

[0043] During this process, the first and second rotors 322 and 332 rotate at high speed. As air flows over the blades, due to the viscous friction of air molecules, the airflow, which has a certain speed, interacts with the relatively stationary airflow behind the blades, forming an airflow with vortices in the downstream area of ​​the blades. These vortices continuously change and break off. The pressure at the center of each vortex is lower than the pressure of the surrounding medium. When a vortex breaks off, a pressure jump occurs in the turbulent airflow. These pressure jumps propagate outward through the surrounding medium and act on the blades. When the pressure pulsations in the turbulent airflow contain audible frequency components and are sufficiently strong, they radiate noise, forming turbulent noise. Simultaneously, as the first and second rotors 322 and 332 rotate, the blades sweep over the air in the vicinity. Due to the mutual interaction of forces, the gas medium is affected by the blades, generating a periodic pressure field and emitting noise. As air flows over the blades, the boundary layers of the suction and pressure surfaces merge at their trailing edges to form a wake region. Within the wake region, the pressure and velocity of the airflow are significantly lower than those in the mainstream. When the first and second impellers 322 and 332 rotate, the airflow within the blade outlet region becomes significantly nonuniform. This nonuniform potential flow field periodically acts on surrounding obstacles, generating noise similar to the sound produced by stroking a string. In other words, when the first and second impellers 322 and 332 rotate, a relatively high noise level is generated. Therefore, in some embodiments, the flow guide 40 includes a noise reduction structure, which can reduce the noise level of the airflow.

[0044] According to the duct air conditioner 100 of the embodiment of the present invention, by arranging a guide member 40 on the outside of the casing 311 of the motor 31, the air flow entering the fan chamber 101 from the air inlet 103 can be diverted under the action of the guide member 40. A part of the air flow can enter the first volute 321 from the inlet of the first volute 321 under the drive of the first wind wheel 322, and the other part of the air flow can enter the second volute 331 from the inlet of the second volute 331 under the drive of the second wind wheel 332, thereby avoiding the motor 31 blocking the inlet of the first volute 321 and the inlet of the second volute 331, affecting the air intake effect of the inlet of the first volute 321 and the air intake effect of the inlet of the second volute 331; by arranging a noise reduction structure on the guide member 40, the noise reduction structure can reduce the noise of the air flow during the flow of the air, thereby reducing the working noise of the duct air conditioner 100 without increasing the size of the whole machine, thereby improving the user experience.

[0045] like Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the flow guide 40 has an avoidance gap 41 for avoiding the shell 311 , and the shape of the avoidance gap 41 is adapted to the shape of the peripheral wall of the shell 311 .

[0046] Therefore, by setting an avoidance gap 41 in the guide member 40, on the one hand, the housing 311 of the motor 31 can be avoided, and on the other hand, the guide member 40 and the housing 311 of the motor 31 can be positioned and assembled, thereby increasing the contact area between the guide member 40 and the housing 311 of the motor 31, thereby improving the reliability and stability of the guide member 40 on the housing 311 of the motor 31, so that the guide member 40 can more effectively play the role of guiding and reducing noise.

[0047] The motor 31 may be mounted on a bracket 314 , which may be connected to the top wall 13 of the housing 10 ; and / or the bracket 314 may be connected to the partition 50 , which may be spaced apart from the bottom wall 12 of the housing 10 .

[0048] According to some embodiments of the present invention, the air inlet 103 is provided on the bottom wall 12 of the housing 10, and the air guide 40 is provided on the side of the housing 311 facing the bottom wall 12. This arrangement allows air outside the housing 10 to enter the fan chamber 101 through the air inlet 103, then flow upward and directly impact the air guide 40, so that the airflow can be divided under the guidance of the air guide 40 and enter the first volute 321 and the second volute 331 respectively.

[0049] like Figure 3-Figure 5 As shown, in some embodiments, the guide member 40 is spaced apart from the bottom wall 12, and the side of the guide member 40 facing the bottom wall 12 has a first guide surface 421 and a second guide surface 422 arranged in opposite directions, the first guide surface 421 extends from bottom to top toward the direction close to the inlet of the first volute 321, and the second guide surface 422 extends from bottom to top toward the direction close to the inlet of the second volute 331.

[0050] The first guide surface 421 can be formed as a curved surface, or an inclined surface, or a portion thereof can be a curved surface and another portion thereof can be an inclined surface. Similarly, the second guide surface 422 can be formed as a curved surface, or an inclined surface, or a portion thereof can be a curved surface and another portion thereof can be an inclined surface.

[0051] Specifically, driven by the fan assembly 30, external air can enter the fan chamber 101 from the air inlet 103, and part of the airflow enters the first volute 321 from the inlet of the first volute 321 under the guidance of the first guide surface 421, and the other part of the airflow enters the second volute 331 from the inlet of the second volute 331 under the guidance of the second guide surface 422. After the two parts of the airflow are pressurized by the corresponding wind wheels, they enter the heat exchange chamber 102 and exchange heat with the heat exchanger 20, and are finally discharged from the air outlet 104 to adjust the indoor air temperature.

[0052] Therefore, in the above technical solution, by arranging the first guide surface 421 and the second guide surface 422 on the side of the guide member 40 facing the bottom wall 12, the airflow entering the fan chamber 101 from the air inlet 103 can be diverted, and the airflow can also be guided to enter the volute from the inlet of the corresponding volute. On the one hand, the resistance of the airflow at the motor 31 can be reduced, and the air intake volume of the first volute 321 and the second volute 331 can be increased. On the other hand, the airflow entering from the air inlet 103 can be evenly introduced into the first volute 321 and the second volute 331, and finally a uniform flow field is formed indoors, thereby avoiding the occurrence of local poorly ventilated areas and improving the indoor air quality and the comfort of people.

[0053] like Figure 5 As shown, in some examples, the first guide surface 421 and the second guide surface 422 are both arc surfaces, and the two are connected by an arc transition. Such an arrangement can achieve better flow diversion and diversion effects.

[0054] like Figure 1 and Figure 3 As shown, according to some embodiments of the present invention, a partition 50 is provided in the outer shell 10, and the partition 50 divides the inner cavity of the outer shell 10 into a fan cavity 101 and a heat exchange cavity 102. The outer shell 10 also includes a first side wall 11, and the first side wall 11 and the partition 50 are arranged opposite to each other in the horizontal direction, and the fan cavity 101 is located between the first side wall 11 and the partition 50.

[0055] Specifically, the partition 50 may define at least two communication ports 51 , wherein one communication port 51 is connected between the heat exchange chamber 102 and the outlet of the first volute 321 , and the other communication port 51 is connected between the heat exchange chamber 102 and the outlet of the second volute 331 .

[0056] The guide member 40 extends in a longitudinal direction in the transverse direction, one end of the guide member 40 extends toward the partition 50 , and the other end of the guide member 40 extends toward the first side wall 11 .

[0057] In the above technical solution, by extending the guide member 40 laterally, the airflow entering the fan chamber 101 from the air inlet 103 can be better diverted and guided laterally, so that the airflow entering from the air inlet 103 can enter the first volute 321 and the second volute 331 more evenly, and finally form a uniform flow field indoors.

[0058] like Figure 3 As shown, according to some embodiments of the present invention, the flow guide 40 is detachably fixed to the outside of the housing 311 and / or the cavity wall of the fan cavity 101 .

[0059] For example, the guide member 40 can be connected to the outside of the housing 311 by fasteners or a snap-on connection, so that the guide member 40 can be taken out and put away together with the housing 311 of the motor 31 for easy maintenance.

[0060] For example, the guide member 40 can be connected to the cavity wall of the fan cavity 101 (for example, the top wall 13 of the housing 10, or the side wall, or the partition 50) by fasteners or snap-fitting, so that a suitable fixing position can be selected according to needs.

[0061] For example, a portion of the guide member 40 is connected to the outside of the shell 311 by fasteners or snap-fitting, and another portion is connected to the cavity wall of the fan cavity 101 by fasteners or snap-fitting. This can increase the fixed position of the guide member 40 and improve the installation reliability of the guide member 40.

[0062] Thus, the guide member 40 can be formed separately, so that the guide member 40 can be detachably fixed to the outside of the shell 311 and / or the cavity wall of the fan cavity 101. On the one hand, the processing difficulty of the guide member 40 can be reduced, thereby reducing the production cost. On the other hand, it can facilitate replacement and maintenance, which is conducive to reducing maintenance costs.

[0063] According to some embodiments of the present invention, a first connecting lug (not shown in the figure) is provided at a position of the guide member 40 near the first volute 321, and a first connecting column (not shown in the figure) is provided on the outside of the shell 311, and the first connecting lug and the first connecting column are connected by a first fastener.

[0064] Specifically, the first connecting lug defines a first connecting hole, the first connecting column defines a first matching hole, and the first fastener is disposed through the first connecting hole and the first matching hole. The first fastener may be a screw, the first connecting hole has a smooth wall, and the first matching hole is a threaded hole, or both the first connecting hole and the first matching hole are threaded holes.

[0065] In the above technical solution, the first connecting lug and the first connecting column have a simple structure and are easy to form, which is conducive to connection through the first fastener, so that the guide member 40 can be fixed to the outside of the housing 311 of the motor 31.

[0066] According to some embodiments of the present invention, a second connecting lug (not shown in the figure) is provided at a position of the guide member 40 near the second volute 331, and a second connecting column (not shown in the figure) is provided on the outside of the shell 311, and the second connecting lug and the second connecting column are connected by a second fastener.

[0067] Specifically, the second connecting lug defines a second connecting hole, the second connecting column defines a second mating hole, and the second fastener is inserted through the second connecting hole and the second mating hole. The second fastener may be a screw, the second connecting hole has a smooth hole wall, and the second mating hole is a threaded hole, or both the second connecting hole and the second mating hole are threaded holes.

[0068] In the above technical solution, the second connecting lug and the second connecting column have a simple structure and are easy to form, which is conducive to connection through the second fastener, so that the guide member 40 can be fixed to the outside of the housing 311 of the motor 31.

[0069] According to other embodiments of the present invention, a first connecting lug and a second connecting lug are respectively provided on opposite sides of the guide member 40, the first connecting lug extends in a direction close to the first volute 321, and the second connecting lug extends in a direction close to the second volute 331, and a first connecting column and a second connecting column are provided at intervals on the outside of the housing 311 of the motor 31, the first connecting lug and the first connecting column are connected by a first fastener, and the second connecting lug and the second connecting column are connected by a second fastener.

[0070] With such an arrangement, the guide member 40 can be fixed to the outside of the housing 311 of the motor 31 from opposite sides of the guide member 40, which is beneficial to improving the installation reliability and stability of the guide member 40 on the housing 311 of the motor 31, thereby ensuring the guide and noise reduction effects of the guide member 40.

[0071] The flow guide 40 is integrally formed with at least a portion of the housing 311. This integral molding of the flow guide 40 and at least a portion of the housing 311 of the motor 31 reduces the number of components and eliminates the need to connect the flow guide 40 to the housing 311, thereby improving assembly efficiency. It also improves the reliability of the connection between the flow guide 40 and the housing 311, thereby ensuring the reliability and stability of the flow guide 40 on the housing 311. Furthermore, the flow guide 40 and the housing 311 of the motor 31 can be removed and placed together, facilitating maintenance.

[0072] like Figure 4 and Figure 5 As shown, according to some embodiments of the present invention, the noise reduction structure includes a first noise reduction chamber 441 and a first noise reduction hole 442. The guide member 40 defines the first noise reduction chamber 441. The first noise reduction hole 442 is located on the wall of the guide member 40 opposite to the inlet of the first volute 321. The first noise reduction hole 442 connects the space between the guide member 40 and the inlet of the first volute 321 with the first noise reduction chamber 441.

[0073] During the rotation of the first wind wheel 322, the airflow outside the outer shell 10 can enter the fan chamber 101 from the air inlet 103, and under the action of the guide member 40, enter the first volute 321 from the inlet of the first volute 321. Since the airflow has a wall attachment effect, during this process, at least part of the airflow will flow along the wall surface opposite to the inlet of the first volute 321 of the guide member 40, so that the sound waves can enter the first noise reduction cavity 441 through the first noise reduction hole 442. When the sound waves enter the first noise reduction cavity 441, they will collide with the cavity wall of the first noise reduction cavity 441 and generate reflections. These reflected sound waves will interfere with the incident sound waves to form a complex sound field distribution. At certain frequencies, the first noise reduction cavity 441 will produce a resonance effect, so that the sound waves are attenuated in the first noise reduction cavity 441, thereby achieving the effect of noise reduction.

[0074] In some embodiments, the flow area of ​​the first noise reduction hole 442 is smaller than the flow area of ​​the first noise reduction cavity 441. This allows the first noise reduction hole 442 and the first noise reduction cavity 441 to cooperate to form a Helmholtz resonator. In this way, when air flows from the first noise reduction hole 442 into the first noise reduction cavity 441, since the flow area of ​​the first noise reduction cavity 441 is larger than the flow area of ​​the first noise reduction hole 442, the flow velocity of the air in the first noise reduction cavity 441 is much smaller than the flow velocity of the local airflow in the center of the first noise reduction cavity 441, thereby forming a more violent shear flow in the first noise reduction cavity 441, accompanied by unstable disturbance waves. At the same time, if the air column in the first noise reduction hole 442 is affected When the disturbance moves into the first noise reduction chamber 441, the gas in the first noise reduction chamber 441 is compressed and the pressure increases. At this time, the air in the first noise reduction hole 442 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 441. In turn, the air column in the first noise reduction hole 442 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, achieving the purpose of noise reduction, and improving the noise reduction effect.

[0075] It should be noted that the resonant frequency of the Helmholtz resonator depends on the geometry and volume of the resonator, so the flow area of ​​the first noise reduction hole 442 and / or the flow area of ​​the first noise reduction cavity 441 can be adjusted according to the frequency of the noise to be eliminated.

[0076] That is to say, the combination of the first noise reduction hole 442 and the first noise reduction cavity 441 can absorb noise of a specific frequency. In this way, the first noise reduction hole 442 and the first noise reduction cavity 441 can be used to absorb noise, thereby achieving the purpose of noise reduction, reducing the noise generated by the fan assembly 30 during operation to a certain extent, and improving the user experience.

[0077] Specifically, if Figure 6 As shown, the noise frequency to be eliminated S is the cross-sectional area of ​​the first noise reduction hole 442, S=πD 2 / 4, V is the volume of the first noise reduction cavity 441, L is the length of the first noise reduction hole 442 (for details, see Figure 6 ).

[0078] Based on this, in a specific example, the first noise reduction cavity 441 can be used to absorb noises of different frequencies by adjusting S, V or L.

[0079] like Figure 5 As shown, in some embodiments, there are multiple first noise reduction cavities 441 and multiple first noise reduction holes 442 , and each first noise reduction cavity 441 corresponds to and is connected to at least one first noise reduction hole 442 .

[0080] For example, the number of the first noise reduction cavities 441 is equal to the number of the first noise reduction holes 442 , the multiple first noise reduction cavities 441 and the multiple first noise reduction holes 442 are connected one-to-one, and the multiple first noise reduction cavities 441 can be arranged horizontally and / or vertically.

[0081] For example, the number of first noise reduction holes 442 is greater than the number of first noise reduction cavities 441, and each first noise reduction cavity 441 corresponds to and is connected with multiple first noise reduction holes 442; or, a part of the first noise reduction cavities 441 corresponds to and is connected with multiple first noise reduction holes 442, and another part of the first noise reduction cavities 441 is connected with one first noise reduction hole 442.

[0082] Therefore, by providing multiple first noise reduction cavities 441 and multiple first noise reduction holes 442, it is beneficial to improve the noise reduction effect and further enhance the user experience.

[0083] like Figure 4 and Figure 5 As shown, in some embodiments, the noise reduction structure also includes a second noise reduction chamber 451 and a second noise reduction hole 452. The guide member 40 defines the second noise reduction chamber 451. The second noise reduction hole 452 is located on the wall of the guide member 40 opposite to the inlet of the second volute 331. The second noise reduction hole 452 connects the space between the guide member 40 and the inlet of the second volute 331 with the second noise reduction chamber 451.

[0084] During the rotation of the second wind wheel 332, the airflow outside the outer shell 10 can enter the fan chamber 101 from the air inlet 103, and under the action of the guide member 40, enter the second volute 331 from the inlet of the second volute 331. Since the airflow has a wall attachment effect, during this process, at least part of the airflow will flow along the wall surface opposite to the inlet of the second volute 331 of the guide member 40, so that the sound waves can enter the second noise reduction cavity 451 through the second noise reduction hole 452. When the sound waves enter the second noise reduction cavity 451, they will collide with the cavity wall of the second noise reduction cavity 451 and generate reflections. These reflected sound waves will interfere with the incident sound waves to form a complex sound field distribution. At certain frequencies, the second noise reduction cavity 451 will produce a resonance effect, so that the sound waves are attenuated in the second noise reduction cavity 451, thereby achieving the effect of noise reduction.

[0085] Similarly, in a specific example, the second noise reduction cavity 451 can be used to absorb noises of different frequencies by adjusting S, V or L.

[0086] like Figure 5 As shown, in some embodiments, there are multiple second noise reduction cavities 451 and second noise reduction holes 452 , and each second noise reduction cavity 451 corresponds to and is connected to at least one second noise reduction hole 452 .

[0087] For example, the number of the second noise reduction chambers 451 is equal to the number of the second noise reduction holes 452, and the plurality of second noise reduction chambers 451 and the plurality of second noise reduction holes 452 are connected one by one. The plurality of second noise reduction chambers 451 can be arranged horizontally and / or vertically.

[0088] For example, the number of second noise reduction holes 452 is greater than the number of second noise reduction cavities 451, and each second noise reduction cavity 451 corresponds to and is connected with multiple second noise reduction holes 452; or, a part of the second noise reduction cavities 451 corresponds to and is connected with multiple second noise reduction holes 452, and another part of the second noise reduction cavities 451 is connected with one second noise reduction hole 452.

[0089] Therefore, by providing multiple second noise reduction cavities 451 and multiple second noise reduction holes 452, it is beneficial to improve the noise reduction effect and further enhance the user experience.

[0090] like Figure 3-Figure 5 As shown, in some embodiments, the thickness direction of the guide member 40 extends longitudinally, the first noise reduction cavity 441 and the second noise reduction cavity 451 are arranged in the thickness direction of the guide member 40, and a partition wall 46 is provided in the guide member 40, which separates the first noise reduction cavity 441 and the second noise reduction cavity 451.

[0091] Specifically, the partition wall 46 extends vertically, and the first noise reduction cavity 441 and the second noise reduction cavity 451 are located on both sides of the thickness direction of the partition wall 46. In an embodiment where the number of the first noise reduction cavity 441 and the second noise reduction cavity 451 is multiple, the multiple first noise reduction cavities 441 are located on one side of the thickness direction of the partition wall 46, and the multiple first noise reduction cavities 441 are arranged in the horizontal and / or vertical direction, and the multiple second noise reduction cavities 451 are located on the other side of the thickness direction of the partition wall 46, and the multiple second noise reduction cavities 451 are arranged in the horizontal and / or vertical direction.

[0092] Therefore, by providing a partition wall 46 in the guide member 40 , the first noise reduction chamber 441 and the second noise reduction chamber 451 can be separated, so that the first noise reduction chamber 441 and the second noise reduction chamber 451 can achieve a noise reduction effect.

[0093] In some specific embodiments, the first noise reduction cavity 441, the first noise reduction hole 442, the second noise reduction cavity 451, and the second noise reduction hole 452 have the same noise reduction principle. For the convenience of description, the first noise reduction cavity 441 and the second noise reduction cavity 451 are collectively referred to as noise reduction cavities, and the first noise reduction hole 442 and the second noise reduction hole 452 are referred to as noise reduction holes.

[0094] Among them, the noise reduction cavity is an independent and relatively closed space with a certain volume, and the noise reduction hole can be a circular hole located on the cavity wall of the noise reduction cavity. The diameter and length of the noise reduction hole and the volume of the noise reduction cavity need to be calculated according to the frequency of the absorbed noise, and the shape and extension direction of the noise reduction hole can be changed arbitrarily. It is only necessary to ensure that the cross-sectional area of ​​the noise reduction hole is consistent with the calculated result.

[0095] Specifically, it is said here that multiple noise reduction cavities are regularly arranged to form a complete sound absorption structure, that is, multiple first noise reduction cavities 441 form a sound absorption structure, and multiple second noise reduction cavities 451 form a sound absorption structure. The acoustic impedance Z of the sound absorption structure satisfies:

[0096] Among them, Z HH The acoustic impedance of the single noise reduction cavity is Z, and n is the ordinal number of the noise reduction cavity. HH satisfy:

[0097]

[0098] Where 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 circular frequency of the noise, and η is the air dynamic viscosity. ca 、c ca and k ca Represent the density, sound speed and wave number of the air in the noise reduction cavity, k ap , Ψ va and Ψ haare 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.

[0099] A is the surface area of ​​the noise reduction chamber. For example, for the first noise reduction chamber 441, A is the surface area of ​​the side of the guide member 40 facing the first volute 321. For the second noise reduction chamber 451, A is the surface area of ​​the side of the guide member 40 facing the second volute 331. The frequency range that has a greater impact on the noise value is 400Hz-2000Hz. Here, the volume of the noise reduction chamber is V and the cross-sectional area of ​​the noise reduction hole is S. ap The inner surface area 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 is x, and the thickness of the guide member 40 is l u , its value range, i.e. the size range of the noise reduction unit, should be as follows:

[0100] 500mm 3 ≤V≤64000mm 3

[0101] 1.44mm 2 ≤S≤100mm 2

[0102] 100mm 2 ≤S ca ≤1600mm 2

[0103] l u ≤L≤V / S ca *0.5

[0104] 1≤x≤9

[0105] The vertical incident sound absorption rate α of the sound absorbing structure can be calculated by the following formula:

[0106]

[0107] 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 in the noise reduction cavity, a larger incident sound absorption rate can be obtained, thereby making the noise reduction efficiency of the sound-absorbing structure higher.

[0108] like Figure 7 As shown, according to some embodiments of the present invention, the fan assembly 30 further includes a third volute 341 and a third wind wheel 342 , and the third wind wheel 342 is disposed in the third volute 341 .

[0109] Among them, the second volute 331 is located between the first volute 321 and the third volute 341, the first wind wheel 322, the second wind wheel 332 and the third wind wheel 342 are coaxially arranged, the first wind wheel 322 is connected to the first output shaft 3121 of the motor 31 through the first connecting shaft 3131, the second wind wheel 332 is connected to the second output shaft 3122 of the motor 31 through the second connecting shaft 3132, and the second connecting shaft 3132 is also connected to the third wind wheel 342.

[0110] In the above technical solution, by making the fan assembly 30 include a first volute 321 and a first wind wheel 322, a second volute 331 and a second wind wheel 332, and a third volute 341 and a third wind wheel 342, the air intake volume can be increased, which is beneficial to improving the air intake performance of the duct air conditioner 100, thereby satisfying the user experience.

[0111] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0112] In the description of the present invention, "first feature" and "second feature" may include one or more of the features. In the description of the present invention, "plurality" means two or more. In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact via another feature between them. In the description of the present invention, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0113] Other structures and operations of the duct-type air conditioner 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0114] 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.

[0115] 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 fan cavity and a heat exchange cavity arranged in a transverse direction, the housing having an air inlet and an air outlet, the air inlet communicating with the fan cavity, and the air outlet communicating with the heat exchange cavity; a heat exchanger, the heat exchanger being disposed in the heat exchange cavity; a fan assembly disposed in the fan cavity and comprising a motor, a first volute, a first wind wheel disposed in the first volute, a second volute, and a second wind wheel disposed in the second volute, wherein the first volute and the second volute are arranged in a longitudinal direction, and the motor is disposed between the first volute and the second volute, and is used to drive the first wind wheel and the second wind wheel to rotate; A flow guide is provided on the outside of the housing of the motor and is located between the inlet of the first volute and the inlet of the second volute, and the flow guide has a noise reduction structure.

2. The duct type air conditioner according to claim 1, characterized in that: The flow guide has an avoidance gap for avoiding the shell, and the shape of the avoidance gap is adapted to the shape of the peripheral wall of the shell.

3. The duct type air conditioner according to claim 1, characterized in that: The air inlet is arranged on the bottom wall of the shell, and the flow guide is arranged on a side of the shell facing the bottom wall.

4. The duct type air conditioner according to claim 3, characterized in that: The guide member is spaced apart from the bottom wall, and has a first guide surface and a second guide surface arranged opposite to each other on the side of the guide member facing the bottom wall. The first guide surface extends from bottom to top toward the direction close to the inlet of the first volute, and the second guide surface extends from bottom to top toward the direction close to the inlet of the second volute.

5. The duct type air conditioner according to claim 4, characterized in that: The first guide surface and the second guide surface are both arc surfaces, and the two are connected by an arc transition.

6. The duct type air conditioner according to claim 1, characterized in that: A partition 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 housing also includes a first side wall, which is arranged opposite to the partition in the transverse direction, and the fan chamber is located between the first side wall and the partition. The length direction of the guide member extends along the transverse direction, with one end in the length direction extending toward the partition and the other end in the length direction extending toward the first side wall.

7. The duct type air conditioner according to claim 1, characterized in that: The flow guide is detachably fixed to the outer side of the shell and / or the cavity wall of the fan cavity.

8. The duct type air conditioner according to claim 1, characterized in that: A first connecting lug is provided on the guide member near the first volute, a first connecting column is provided on the outer side of the housing, and the first connecting lug and the first connecting column are connected by a first fastener; And / or, a second connecting lug is provided at a position of the flow guide member close to the second volute, a second connecting column is provided on the outer side of the shell, and the second connecting lug and the second connecting column are connected by a second fastener.

9. The duct type air conditioner according to claim 1, characterized in that: The flow guide is integrally formed with at least a portion of the shell.

10. The duct-type air conditioner according to any one of claims 1 to 9, characterized in that: The noise reduction structure includes a first noise reduction cavity and a first noise reduction hole. The flow guide defines the first noise reduction cavity. The first noise reduction hole is located on the wall of the flow guide opposite to the inlet of the first volute. The first noise reduction hole connects the space between the flow guide and the inlet of the first volute with the first noise reduction cavity.

11. The duct type air conditioner according to claim 10, characterized in that: There are multiple first noise reduction cavities and multiple first noise reduction holes, and each first noise reduction cavity corresponds to and is connected to at least one first noise reduction hole.

12. The duct type air conditioner according to claim 10, characterized in that: The noise reduction structure also includes a second noise reduction cavity and a second noise reduction hole. The flow guide member defines the second noise reduction cavity. The second noise reduction hole is located on the wall of the flow guide member opposite to the inlet of the second volute. The second noise reduction hole connects the space between the flow guide member and the inlet of the second volute with the second noise reduction cavity.

13. The duct type air conditioner according to claim 12, characterized in that: There are multiple second noise reduction cavities and multiple second noise reduction holes, and each second noise reduction cavity corresponds to and is connected to at least one second noise reduction hole.

14. The duct type air conditioner according to claim 12, characterized in that: The thickness direction of the flow guide extends along the longitudinal direction, the first noise reduction cavity and the second noise reduction cavity are arranged in the thickness direction of the flow guide, and a partition wall is provided in the flow guide, which separates the first noise reduction cavity and the second noise reduction cavity.

15. The duct-type air conditioner according to any one of claims 1 to 9, characterized in that: The fan assembly further includes a third volute and a third wind wheel disposed in the third volute, and the second volute is located between the first volute and the third volute; The first wind wheel, the second wind wheel and the third wind wheel are coaxially arranged, the first wind wheel is connected to the first output shaft of the motor through a first connecting shaft, the second wind wheel is connected to the second output shaft of the motor through a second connecting shaft, and the second connecting shaft is also connected to the third wind wheel.

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