Air duct assembly and air conditioning device

Abstract

The present disclosure relates to an air duct assembly and an air conditioning device. The air duct assembly comprises a housing, a centrifugal fan and a cross-flow fan, a first air door mechanism and a second air door mechanism. The housing is provided with a centrifugal fan front side air outlet, a centrifugal fan front side air inlet, a centrifugal fan lower part air outlet, a centrifugal fan lower part air inlet, a cross-flow fan front side air outlet and a cross-flow fan rear part air outlet. A first air port of a centrifugal fan volute is in communication with the centrifugal fan front side air outlet, and a second air port of the volute is in communication with the centrifugal fan lower part air outlet; a first air port of a cross-flow fan volute chamber is in communication with the cross-flow fan front side air outlet, and a second air port of the volute chamber is in communication with the cross-flow fan rear part air outlet. The first air door mechanism is used to open one of the centrifugal fan front side air outlet and the centrifugal fan front side air inlet while closing the other one; the second air door mechanism is used to open one of the centrifugal fan lower part air outlet and the centrifugal fan lower part air inlet while closing the other one.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning technology, and more particularly to an air duct assembly and air conditioning equipment. Background Technology

[0002] The air duct design in related technologies, such as the air duct design of ducted air conditioners, has a single airflow path from intake to exhaust. Because its effect on pushing the surrounding airflow is slow, the air circulation efficiency is low, which affects the user experience. Utility Model Content

[0003] To overcome the problems existing in the related technologies, this disclosure provides a duct assembly and an air conditioning device.

[0004] According to a first aspect of the present disclosure, a duct assembly is provided, comprising: The casing is provided with a centrifugal fan front air outlet, a centrifugal fan front air inlet, a centrifugal fan lower air outlet, a centrifugal fan lower air inlet, a cross-flow fan front air outlet, and a cross-flow fan rear air outlet. At least one centrifugal fan and at least one cross-flow fan are alternately arranged inside the housing; airflow enters the housing through the front air inlet or the lower air inlet of the centrifugal fan, and then enters the centrifugal fan; The centrifugal fan is a dual-outlet centrifugal fan. The first outlet of the centrifugal fan casing is connected to the front outlet of the centrifugal fan, and the second outlet of the centrifugal fan casing is connected to the lower outlet of the centrifugal fan. The first outlet of the cross-flow fan volute is connected to the front outlet of the cross-flow fan, and the second outlet of the cross-flow fan volute is connected to the rear outlet of the cross-flow fan. A first damper mechanism is used to open one of the front air outlet and the front air inlet of the centrifugal fan while simultaneously closing the other; and The second damper mechanism is used to open one of the lower air outlet and the lower air inlet of the centrifugal fan while closing the other.

[0005] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: The air duct assembly provided by this disclosure, by controlling the damper mechanism and combining it with the forward and reverse rotation of the fan, can achieve reversible air delivery of the air duct assembly. That is, the airflow can either enter from the bottom and exit from the side, or enter from the side and exit from the bottom. By changing the direction of airflow, it is beneficial to accelerate indoor air circulation, improve indoor air circulation efficiency, and enhance the user experience. In addition, the air duct assembly is equipped with two types of fans: a centrifugal fan and a cross-flow fan. The centrifugal fan has high wind pressure and wind speed, enabling long-distance and powerful airflow delivery, while the cross-flow fan has the characteristics of uniform air delivery and stable airflow. The combination of the two ensures both airflow coverage in long-distance indoor areas and gentle and comfortable airflow.

[0006] In some possible implementations, two centrifugal fans and one cross-flow fan are provided, with the two centrifugal fans located on opposite sides of the cross-flow fan. Positioning the cross-flow fan between the two centrifugal fans helps avoid airflow interference between them. Furthermore, symmetrically arranging the two centrifugal fans on either side of the cross-flow fan helps ensure uniform airflow into the room.

[0007] In some possible implementations, the centrifugal fan is a single-sided suction fan, and the air inlet of the centrifugal fan is located on the side opposite to the cross-flow fan. This allows the centrifugal fan and the cross-flow fan to be arranged close enough to optimize the internal space of the duct assembly, providing a basis for the miniaturization of air conditioning equipment.

[0008] In some possible implementations, the ratio of the width of the front outlet of the centrifugal fan, the width of the front outlet of the cross-flow fan, and the width of the housing is 2:3:15, thereby allowing airflow to fully enter the centrifugal fan and the cross-flow fan, thus increasing the air volume; and / or, the ratio of the height of the second air outlet of the cross-flow fan volute to the height of the first air outlet of the cross-flow fan volute is 2:3, thereby enabling the airflow to achieve dynamic balance when the cross-flow fan switches inlet and outlet, increasing the air volume of the front and rear air supply.

[0009] In some possible implementations, the rear air outlet of the cross-flow fan is located on the rear side wall of the housing or on the bottom wall of the housing. When the rear air outlet of the cross-flow fan is located on the rear side wall of the housing, the rear lateral air outlet can be further expanded based on the lower rear air outlet of the centrifugal fan; when the rear air outlet of the cross-flow fan is located on the bottom wall of the housing, the downward airflow volume can be increased.

[0010] In some possible implementations, the first damper mechanism and the second damper mechanism include any one of translation, rotation, folding and telescopic mechanisms.

[0011] In some possible implementations, the front air outlet and the front air inlet of the centrifugal fan are arranged adjacent to each other. The first damper mechanism includes a first baffle and a first driving device. The first driving device is used to drive the first baffle to slide, so that one of the front air outlet and the front air inlet of the centrifugal fan is opened while the other is closed. The first damper structure adopts the form of a sliding door, and the damper can be switched by sliding. It has a simple structure and is easy to operate, and can quickly respond to the adjustment needs of reversible air supply for the air inlet and outlet states.

[0012] In some possible implementations, the lower air outlet and the lower air inlet of the centrifugal fan are arranged adjacent to each other. The second damper mechanism includes a second baffle and a second driving device. The second driving device drives the second baffle to slide, so that one of the lower air outlet and the lower air inlet of the centrifugal fan is opened while the other is closed. The second damper mechanism adopts the form of a sliding door, and the damper can be switched by sliding. It has a simple structure and is easy to operate, and can quickly respond to the adjustment needs of reversible air supply for the air inlet and outlet states.

[0013] In some possible implementations, the blades of the two centrifugal fans have the same direction of rotation, and the cross-flow fan has the same or opposite direction of rotation as the blades of the two centrifugal fans; or The blades of the two centrifugal fans have opposite directions of rotation, and the cross-flow fan has blades with the same direction of rotation as at least one of the two centrifugal fans.

[0014] Different combinations of centrifugal fan blades and cross-flow fan blades can flexibly adapt the air volume according to the usage scenario, realize flexible switching of air volume in multiple scenarios, and meet diverse usage needs.

[0015] In some possible implementations, the blades of the two centrifugal fans have the same direction of rotation, and the blades of the cross-flow fan have the same direction of rotation as the blades of the two centrifugal fans, with the two centrifugal fans and the cross-flow fan configured to rotate synchronously. This approach simplifies the fan control strategy.

[0016] In some possible implementations, the blades of the two centrifugal fans have opposite directions of rotation, and the blades of the cross-flow fan have the same direction of rotation as one of the two centrifugal fans. The centrifugal fans and the cross-flow fan that rotate in the same direction as their own blades operate, while those that rotate in the opposite direction stop operating. Shutting down fans that contribute less energy, without significantly affecting the output efficiency and volume, helps save energy.

[0017] In some possible implementations, the blades of the two centrifugal fans have opposite directions of rotation, and the two centrifugal fans are configured to rotate synchronously, while the cross-flow fan stops operating. In this case, the duct assembly can achieve the same airflow efficiency and volume regardless of whether it is bottom inlet / side outlet or side inlet / bottom outlet, thus providing a stable user experience.

[0018] In some possible implementations, the cross-flow fan includes a first impeller and a second impeller, wherein the blades of the first impeller have the same rotation direction as the blades of one of the two centrifugal fans, and the blades of the second impeller have the same rotation direction as the blades of the other of the two centrifugal fans. The blades of the two centrifugal fans have opposite directions of rotation, and the two centrifugal fans and the cross-flow fan are configured to rotate synchronously.

[0019] The blades of the two centrifugal fans have opposite directions of rotation, and the two centrifugal fans and the cross-flow fan are configured to rotate synchronously. In this case, the cross-flow fan does not need to be stopped, thereby providing a larger air volume than the aforementioned embodiment.

[0020] In some possible implementations, the air duct assembly further includes a heat exchanger disposed within the housing, the heat exchanger being positioned corresponding to the front air outlet of the centrifugal fan, and / or the heat exchanger being positioned corresponding to the lower air outlet of the centrifugal fan. Air drawn into the air duct assembly by the fan is cooled or heated upon contact with the heat exchanger and then blown out of the air duct assembly to achieve the purpose of cooling or heating.

[0021] In some possible implementations, the housing includes a partition plate that divides the interior of the housing into a heat exchange chamber and a fan chamber along the front-to-back direction. The heat exchanger is disposed in the heat exchange chamber, and the centrifugal fan and the cross-flow fan are disposed in the fan chamber. The front sidewall of the heat exchange chamber has a communication port connecting it to the external environment. At least one of the front air outlet of the centrifugal fan, the front air inlet of the centrifugal fan, and the front air outlet of the cross-flow fan is disposed on the partition plate. Using the partition plate to divide the interior of the housing into the heat exchange chamber and the fan chamber effectively reduces mutual interference between the two independent areas. Furthermore, centralizing the air outlets on the partition plate facilitates control over the switching of the air outlets.

[0022] According to a second aspect of the present disclosure, an air conditioning device is provided, including the air duct assembly of any one of the above.

[0023] In some possible implementations, the air conditioning device is a ducted air conditioner.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0026] Figure 1 This is an exploded view of the structure of a duct assembly according to an exemplary embodiment.

[0027] Figure 2 This is a top-view structural schematic diagram of an air duct assembly according to an exemplary embodiment.

[0028] Figure 3 This is a schematic diagram of a duct assembly from an upward perspective, according to an exemplary embodiment, wherein the lower air inlet of the centrifugal fan is open.

[0029] Figure 4 This is a schematic diagram of a duct assembly from an upward perspective, according to an exemplary embodiment, wherein the lower air inlet of the centrifugal fan is closed.

[0030] Figure 5 This is a top view illustrating the internal structure of an air duct assembly according to an exemplary embodiment.

[0031] Figure 6 This is a side view of a cross-flow fan according to an exemplary embodiment.

[0032] Explanation of reference numerals in the attached figures 1-Shell, 11-Heat exchange chamber, 111-Connecting port, 12-Fan chamber, 121-Lower air outlet of centrifugal fan, 122-Lower air inlet of centrifugal fan, 123-Rear air outlet of cross-flow fan, 13-Middle partition, 131-Front air outlet of centrifugal fan, 132-Front air inlet of centrifugal fan, 133-Front air outlet of cross-flow fan, 2-Centrifugal fan, 21-First air outlet of volute, 22-Second air outlet of volute, 3-Cross-flow fan, 31-First air outlet of volute, 32-Second air outlet of volute, 4-First damper mechanism, 41-First baffle, 42-First drive device, 5-Second damper mechanism, 51-Second baffle, 52-Second drive device, 6-Heat exchanger. Detailed Implementation

[0033] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0034] It should be noted that all actions involving the acquisition of signals, information, or data in this disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the location is situated, and with authorization from the owner of the relevant device.

[0035] This disclosure provides an exemplary embodiment of an air duct assembly. This air duct assembly is optionally applicable to air conditioning equipment, including ducted air conditioners, wall-mounted air conditioners, cabinet air conditioners, fresh air units, and air purification equipment, etc., and this disclosure does not impose any limitations thereon. For ease of description, a ducted air conditioner is used as an example for illustrative purposes below.

[0036] like Figures 1 to 6 As shown, the air duct assembly provided in this disclosure includes a housing 1, at least one centrifugal fan 2 and at least one cross-flow fan 3, a first damper mechanism 4, and a second damper mechanism 5. The housing 1 is provided with a front air outlet 131 for the centrifugal fan, a front air inlet 132 for the centrifugal fan, a lower air outlet 121 for the centrifugal fan, a lower air inlet 122 for the centrifugal fan, a front air outlet 133 for the cross-flow fan, and a rear air outlet 123 for the cross-flow fan. The centrifugal fan 2 and the cross-flow fan 3 are alternately arranged within the housing 1; airflow enters the housing 1 through the front air inlet 132 or the lower air inlet 122 of the centrifugal fan, and then enters the centrifugal fan 2.

[0037] Centrifugal fan 2 is a dual-outlet centrifugal fan. The first outlet 21 of the centrifugal fan 2 casing is connected to the front outlet 131 of the centrifugal fan, and the second outlet 22 of the centrifugal fan 2 casing is connected to the lower outlet 121 of the centrifugal fan. The first outlet 31 of the cross-flow fan 3 volute is connected to the front outlet 133 of the cross-flow fan, and the second outlet 32 ​​of the cross-flow fan 3 volute is connected to the rear outlet 123 of the cross-flow fan. The first damper mechanism 4 is used to open one of the front outlet 131 and the front inlet 132 of the centrifugal fan while closing the other. The second damper mechanism 5 is used to open one of the lower outlet 121 and the lower inlet 122 of the centrifugal fan while closing the other.

[0038] The casing 1 is equipped with a side air vent and a bottom air vent. The side air vent is used to blow air out laterally in the horizontal direction, and the bottom air vent is used to blow air out vertically downward. The centrifugal fan 2 is a dual-outlet centrifugal fan, which allows air to be blown out from the first air vent 21 and the second air vent 22 of the volute casing respectively. The air blown out from the first air vent 21 of the volute casing is laterally sent into the room through the front air outlet 131 of the centrifugal fan, and the air blown out from the second air vent 22 of the volute casing is sent downward into the room through the bottom air outlet 121 of the centrifugal fan.

[0039] The cross-flow fan 3 and the centrifugal fan 2 operate on different principles. By rotating the impeller in both directions, airflow enters the volute chamber from the first inlet 31 and exits from the second inlet 32. The airflow from the second inlet 32 ​​is then discharged laterally or downwards into the room via the rear outlet 123. Alternatively, airflow can enter the volute chamber from the second inlet 32 ​​and exit from the first inlet 31, then be discharged laterally into the room via the front outlet 133. In other words, by rotating the impeller, the first inlet 31 and the second inlet 32 ​​of the volute chamber of the cross-flow fan 3 switch between being the airflow inlet and outlet. This differs from the dual-outlet centrifugal fan, where the first inlet 21 and the second inlet 22 of the volute casing always serve as the airflow outlet, and the centrifugal fan 2's inlet is located on the side of the fan.

[0040] The first damper mechanism 4 is controlled to open the front air outlet 131 of the centrifugal fan while simultaneously closing the front air inlet 132. The second damper mechanism 5 is controlled to close the lower air outlet 121 of the centrifugal fan while simultaneously opening the lower air inlet 122. At this time, under the action of the centrifugal fan 2 rotating in the first direction, the airflow enters the housing 1 through the lower air inlet 122, then enters the volute of the centrifugal fan 2, and finally exits from the front air outlet 131, thereby achieving lower air inlet and lateral air outlet. In addition, the cross-flow fan 3 is controlled to allow the airflow to enter the volute through the rear air outlet 123, and then exit from the front air outlet 133.

[0041] The first damper mechanism 4 is controlled to close the front air outlet 131 of the centrifugal fan and simultaneously open the front air inlet 132 of the centrifugal fan; the second damper mechanism 5 is controlled to open the lower air outlet 121 of the centrifugal fan and simultaneously close the lower air inlet 122 of the centrifugal fan. At this time, under the action of the centrifugal fan 2 rotating in the second direction, which is opposite to the first direction, the airflow enters the housing 1 through the front air inlet 132 of the centrifugal fan, then enters the volute of the centrifugal fan 2, and finally exits from the lower air outlet 121 of the centrifugal fan, thereby realizing side air intake and downward air outlet. In addition, the cross-flow fan 3 is controlled to make the airflow enter the volute through the front air outlet 133 of the cross-flow fan and then exit from the rear air outlet 123 of the cross-flow fan.

[0042] The air duct assembly disclosed herein, through control of the damper mechanism and in conjunction with the forward and reverse rotation of the fan, enables reversible airflow. That is, airflow can either enter from the bottom and exit from the side, or enter from the side and exit from the bottom. By changing the direction of airflow, it helps to accelerate indoor air circulation, improve indoor air circulation efficiency, and enhance the user experience.

[0043] This improvement in air circulation efficiency has different effects on different devices. Taking a device that can cool or heat as an example, when cooling in summer, the cold airflow presses the hot airflow to the bottom, forming a stratification of cold at the top and hot at the bottom. In related technologies, a single air inlet and outlet path, such as side air inlet and bottom air outlet, prevents the hot airflow at the bottom from being quickly drawn into the device. In this case, the reversible air supply is switched to bottom air inlet and side outlet, so that the hot airflow at the bottom can be quickly drawn into the device.

[0044] In addition, the air duct assembly is equipped with two types of fans: centrifugal fan 2 and cross-flow fan 3. Centrifugal fan 2 has high air pressure and air speed, which can realize long-distance and powerful airflow delivery, while cross-flow fan 3 has the characteristics of uniform air delivery and stable airflow. The combination of the two ensures airflow coverage in long-distance indoor areas and also ensures the gentleness and comfort of airflow.

[0045] This disclosure does not limit the number or distribution of centrifugal fans 2 and cross-flow fans 3. In some possible embodiments, two centrifugal fans 2 and one cross-flow fan 3 are provided, with the two centrifugal fans 2 located on opposite sides of the cross-flow fan 3. Positioning the cross-flow fan 3 between the two centrifugal fans 2 helps avoid airflow interference between them. Furthermore, symmetrically arranging the two centrifugal fans 2 on opposite sides of the cross-flow fan 3 helps ensure uniform airflow into the room.

[0046] In some possible implementations, the centrifugal fan 2 is a single-sided suction fan, and the air inlet of the centrifugal fan 2 is located on the side away from the cross-flow fan 3. In this case, since the centrifugal fan 2 does not perform suction on the side near the cross-flow fan 3, there is no need to reserve an air inlet channel between the centrifugal fan 2 and the cross-flow fan 3. This allows the centrifugal fan 2 and the cross-flow fan 3 to be arranged close enough, optimizing the internal space of the air duct assembly and providing a basis for the miniaturization of the air conditioning equipment. In other possible implementations, the air inlet of the single-sided suction fan can also be located on the side of the centrifugal fan 2 near the cross-flow fan. In still other possible implementations, the centrifugal fan 2 can also be configured as a double-sided suction fan.

[0047] like Figure 5 As shown, the ratio of the width L2 / L4 of the centrifugal fan's front outlet 131, the width L3 of the cross-flow fan's front outlet 133, and the width L1 of the casing 1 is 2:3:15. This allows the airflow to fully enter the centrifugal fan 2 and the cross-flow fan 3, thereby increasing the air volume. The first air outlet 21 of the centrifugal fan 2's volute has the same width as the centrifugal fan's front outlet 131, and the first air outlet 31 of the cross-flow fan 3's volute has the same width as the cross-flow fan's front outlet 133.

[0048] like Figure 6As shown, the ratio of the height L5 of the second air outlet 32 ​​of the volute of the cross-flow fan 3 to the height L6 of the first air outlet 31 of the volute of the cross-flow fan 3 is 2:3. Therefore, the airflow of the cross-flow fan 3 can achieve dynamic balance when switching inlets and outlets, increasing the air volume of both the front and rear air supply. The width of the second air outlet 32 ​​of the volute of the cross-flow fan 3 can be equal to its height, and the width of the first air outlet 31 of the volute of the cross-flow fan 3 can also be equal to its height.

[0049] In some possible implementations, such as Figure 1 As shown, the rear air outlet 123 of the cross-flow fan is located on the rear side wall of the housing 1 or on the bottom wall of the housing 1. When the rear air outlet 123 of the cross-flow fan is located on the rear side wall of the housing 1, the rear lateral air outlet can be further expanded based on the lower rear air outlet of the centrifugal fan 2; when the rear air outlet 123 of the cross-flow fan is located on the bottom wall of the housing, the downward air volume can be increased.

[0050] The damper mechanism can be implemented in various ways. For example, the first damper mechanism 4 and the second damper mechanism 5 include any one of translation, rotation, folding, and telescopic mechanisms. The first damper mechanism 4 and the second damper mechanism 5 can take the same form or take different methods.

[0051] In some possible implementations, such as Figure 1 As shown, the front air outlet 131 and the front air inlet 132 of the centrifugal fan are arranged adjacent to each other. The first damper mechanism 4 includes a first baffle 41 and a first driving device 42. The first driving device 42 is used to drive the first baffle 41 to slide, so that one of the front air outlet 131 and the front air inlet 132 of the centrifugal fan is opened while the other is closed. The first damper mechanism 4 adopts the form of a sliding door, and the damper can be switched by sliding. It has a simple structure and is easy to operate, and can quickly respond to the adjustment needs of reversible air supply for the air inlet and outlet states. The first driving device 42 can, for example, adopt a gear and rack drive form, wherein the rack can be set on the first baffle 41 and the gear is set on the output shaft of the stepper motor.

[0052] In other possible implementations, such as Figure 3As shown, the lower air outlet 121 and the lower air inlet 122 of the centrifugal fan are arranged adjacent to each other. The second damper mechanism 5 includes a second baffle 51 and a second driving device 52. The second driving device 52 is used to drive the second baffle 51 to slide, so that one of the lower air outlet 121 and the lower air inlet 122 of the centrifugal fan is opened while the other is closed. The second damper mechanism 5 adopts the form of a sliding door, and the damper can be switched by sliding. It has a simple structure and is easy to operate, and can quickly respond to the adjustment needs of reversible air supply for the air inlet and outlet states. The second driving device 52 can, for example, adopt a gear and rack drive form, wherein the rack can be set on the second baffle 51 and the gear is set on the output shaft of the stepper motor.

[0053] The blades of the two centrifugal fans 2 have the same rotation direction, and the cross-flow fan 3 has the same or opposite rotation direction as the blades of the two centrifugal fans 2; or the blades of the two centrifugal fans 2 have opposite rotation directions, and the cross-flow fan 3 has blades with the same rotation direction as at least one of the two centrifugal fans 2. Different combinations of rotation directions of the centrifugal fan 2 blades and the cross-flow fan 3 blades can flexibly adapt the airflow according to the usage scenario, achieving flexible airflow switching in multiple scenarios and meeting diverse usage needs.

[0054] In some possible implementations, the blades of the two centrifugal fans 2 have the same rotation direction, and the blades of the cross-flow fan 3 have the same rotation direction as the blades of the two centrifugal fans 2. The two centrifugal fans 2 and the cross-flow fan 3 are configured to rotate synchronously. The rotation direction of the blades determines the fan's air outlet efficiency and air volume, while the forward and reverse rotation of the fan determines the direction of air outlet. Therefore, when the blades of the two centrifugal fans 2 and the cross-flow fan 3 have the same rotation direction, the forward and reverse rotation of the fan will result in different air outlet efficiencies and air volumes. That is, the bottom inlet and side outlet of the duct assembly and the side inlet and bottom outlet will have different air outlet efficiencies and air volumes. This method simplifies the fan control strategy.

[0055] In some possible implementations, the blades of the two centrifugal fans 2 have opposite rotation directions, and the blades of the cross-flow fan 3 have the same rotation direction as one of the two centrifugal fans 2. The centrifugal fans 2 and the cross-flow fan 3 operate with the rotation direction of their own blades in the same direction, while those rotating in the opposite direction are stopped. Considering that when the fan's rotation direction is opposite to its own blade rotation direction, its contribution to airflow efficiency and volume is lower, shutting down the fan with the lower contribution, without significantly affecting airflow efficiency and volume, is beneficial for energy saving.

[0056] In some possible implementations, the blades of the two centrifugal fans 2 have opposite directions of rotation, and the two centrifugal fans 2 are configured to rotate synchronously, while the cross-flow fan 3 stops operating. In this case, the air duct assembly can achieve the same air outlet efficiency and air volume regardless of whether it is bottom inlet and side outlet or side inlet and bottom outlet, thus obtaining a stable user experience.

[0057] For example, in the bottom-inlet, side-outlet mode, the fan contributes 80% of the airflow efficiency when its rotation direction is the same as the rotation direction of its blades, and 20% when its rotation direction is opposite to the rotation direction of its blades. Ideally, the total airflow efficiency is 100%. When switching to the side-inlet, bottom-outlet mode, the fan that originally contributed 80% of the airflow efficiency now contributes 20%, and vice versa. Ideally, the total airflow efficiency is still not 100%. In other implementations that achieve the same airflow efficiency and volume regardless of whether it is bottom-inlet, side-outlet, or side-inlet, bottom-outlet, the cross-flow fan 3 includes an axially distributed first impeller and a second impeller. The blades of the first impeller have the same rotation direction as the blades of one of the two centrifugal fans 2, and the blades of the second impeller have the same rotation direction as the blades of the other of the two centrifugal fans 2. The blades of the two centrifugal fans 2 have opposite directions of rotation, and the two centrifugal fans 2 and the cross-flow fan 3 are configured to rotate synchronously. In this case, the cross-flow fan 3 does not need to be stopped, thereby providing a larger air volume than the aforementioned embodiment.

[0058] The air duct assembly provided in this disclosure, in addition to improving air circulation efficiency, can further be used for cooling and refrigeration functions. In some possible embodiments, the air duct assembly also includes a heat exchanger 6 disposed within the housing 1, the heat exchanger 6 being disposed corresponding to the front air outlet 131 of the centrifugal fan, and / or the heat exchanger 6 being disposed corresponding to the lower air outlet 121 of the centrifugal fan. Air drawn into the air duct assembly by the fan is cooled or heated upon contact with the heat exchanger and then blown out of the air duct assembly to achieve the purpose of cooling or heating.

[0059] In cooling mode, the first damper mechanism 4 opens the front air outlet 131 of the centrifugal fan while simultaneously closing the front air inlet 132. The second damper mechanism 5 closes the lower air outlet 121 of the centrifugal fan while simultaneously opening the lower air inlet 122. At this time, under the action of the centrifugal fan 2, airflow enters the housing 1 through the lower air inlet 122, then enters the volute of the centrifugal fan 2, and finally exits from the front air outlet 131. The cross-flow fan 3 is controlled to allow airflow to enter the volute chamber through the rear air outlet 123, and then exit from the front air outlet 133. The cool air, under its own gravity, slowly flows from top to bottom, covering the human body from above in a shower-like manner, improving user comfort.

[0060] In heating mode, the first damper mechanism 4 closes the front air outlet 131 of the centrifugal fan while opening the front air inlet 132; the second damper mechanism 5 opens the lower air outlet 121 of the centrifugal fan while closing the lower air inlet 122. At this time, under the action of the centrifugal fan 2, airflow enters the housing 1 through the front air inlet 132, then enters the volute of the centrifugal fan 2, and finally exits from the lower air outlet 121. The cross-flow fan 3 is controlled to allow airflow to enter the volute chamber through the front air outlet 133, and then exit from the rear air outlet 123. The hot air rises slowly, enveloping the user from bottom to top in a carpet-like manner, enhancing user comfort.

[0061] In some possible implementations, such as Figure 1 As shown, the housing 1 includes a partition 13, which divides the interior of the housing 1 into a heat exchange chamber 11 and a fan chamber 12 along the front-to-back direction. A heat exchanger 6 is disposed in the heat exchange chamber 11, and a centrifugal fan 2 and a cross-flow fan 3 are disposed in the fan chamber 12. The front wall of the heat exchange chamber 11 has a connecting port 111 that connects to the external environment and the heat exchange chamber 11. At least one of the centrifugal fan front outlet 131, the centrifugal fan front inlet 132, and the cross-flow fan front outlet 133 is disposed in the partition 13. Figure 1 The centrifugal fan front outlet 131, centrifugal fan front inlet 132, and cross-flow fan front outlet 133 are all located on the partition 13. The partition 13 divides the interior of the housing 1 into a heat exchange chamber 11 and a fan chamber 12. These two independent areas effectively reduce mutual interference. For example, it prevents vibrations generated during fan operation from adversely affecting the heat exchanger 6, or prevents condensate generated during heat exchanger 6 operation from flowing into the fan chamber 12. Furthermore, centralizing all air outlets on the partition 13 facilitates control over outlet switching.

[0062] According to a second aspect of the present disclosure, an air conditioning device is also provided, comprising the air duct assembly described in any one of the foregoing embodiments, and having all of its beneficial effects. Optionally, the air conditioning device includes a ducted air conditioner, a wall-mounted air conditioner, a cabinet air conditioner, a fresh air unit, and an air purification device, etc.

[0063] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0064] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A duct assembly, characterized in that, include: The casing is provided with a centrifugal fan front air outlet, a centrifugal fan front air inlet, a centrifugal fan lower air outlet, a centrifugal fan lower air inlet, a cross-flow fan front air outlet, and a cross-flow fan rear air outlet. At least one centrifugal fan and at least one cross-flow fan are alternately arranged inside the housing; airflow enters the housing through the front air inlet or the lower air inlet of the centrifugal fan, and then enters the centrifugal fan; The centrifugal fan is a dual-outlet centrifugal fan. The first outlet of the centrifugal fan casing is connected to the front outlet of the centrifugal fan, and the second outlet of the centrifugal fan casing is connected to the lower outlet of the centrifugal fan. The first outlet of the cross-flow fan volute is connected to the front outlet of the cross-flow fan, and the second outlet of the cross-flow fan volute is connected to the rear outlet of the cross-flow fan. A first damper mechanism is used to open one of the front air outlet and the front air inlet of the centrifugal fan while simultaneously closing the other; and The second damper mechanism is used to open one of the lower air outlet and the lower air inlet of the centrifugal fan while closing the other.

2. The air duct assembly according to claim 1, characterized in that, There are two centrifugal fans and one cross-flow fan, with the two centrifugal fans located on opposite sides of the cross-flow fan.

3. The air duct assembly according to claim 2, characterized in that, The centrifugal fan is a single-sided suction fan, and the air inlet of the centrifugal fan is located on the side away from the cross-flow fan.

4. The air duct assembly according to claim 1, characterized in that, The ratio of the width of the front air outlet of the centrifugal fan, the width of the front air outlet of the cross-flow fan, and the width of the housing is 2:3:15; and / or, the ratio of the height of the second air outlet of the cross-flow fan volute to the height of the first air outlet of the cross-flow fan volute is 2:

3.

5. The air duct assembly according to claim 1, characterized in that, The air outlet of the cross-flow fan is located on the rear side wall of the housing or on the bottom wall of the housing.

6. The air duct assembly according to claim 1, characterized in that, The first damper mechanism and the second damper mechanism include any one of translation, rotation, folding and telescopic mechanisms.

7. The air duct assembly according to claim 1, characterized in that, The centrifugal fan front outlet and the centrifugal fan front inlet are arranged adjacent to each other. The first damper mechanism includes a first baffle and a first driving device. The first driving device is used to drive the first baffle to slide so that one of the centrifugal fan front outlet and the centrifugal fan front inlet is opened while the other is closed.

8. The air duct assembly according to claim 1, characterized in that, The lower air outlet and the lower air inlet of the centrifugal fan are arranged adjacent to each other. The second damper mechanism includes a second baffle and a second driving device. The second driving device is used to drive the second baffle to slide so that one of the lower air outlet and the lower air inlet of the centrifugal fan is opened while the other is closed.

9. The air duct assembly according to claim 1, characterized in that, The blades of the two centrifugal fans have the same direction of rotation, and the cross-flow fan has the same or opposite direction of rotation as the blades of the two centrifugal fans; or The blades of the two centrifugal fans have opposite directions of rotation, and the cross-flow fan has blades with the same direction of rotation as at least one of the two centrifugal fans.

10. The air duct assembly according to claim 9, characterized in that, The blades of the two centrifugal fans have the same rotation direction, and the blades of the cross-flow fan have the same rotation direction as the blades of the two centrifugal fans. The two centrifugal fans and the cross-flow fan are configured to rotate synchronously.

11. The air duct assembly according to claim 9, characterized in that, The blades of the two centrifugal fans have opposite directions of rotation, and the blades of the cross-flow fan have the same direction of rotation as one of the two centrifugal fans. The centrifugal fans and the cross-flow fan that rotate in the same direction as their own blades rotate are in operation, and the ones that rotate in the opposite direction to their own blades rotate are out of operation.

12. The air duct assembly according to claim 9, characterized in that, The blades of the two centrifugal fans have opposite directions of rotation, the two centrifugal fans are configured to rotate synchronously, and the cross-flow fan stops operating.

13. The air duct assembly according to claim 9, characterized in that, The cross-flow fan includes a first impeller and a second impeller. The blades of the first impeller have the same rotation direction as the blades of one of the two centrifugal fans, and the blades of the second impeller have the same rotation direction as the blades of the other of the two centrifugal fans. The blades of the two centrifugal fans have opposite directions of rotation, and the two centrifugal fans and the cross-flow fan are configured to rotate synchronously.

14. The air duct assembly according to any one of claims 1-13, characterized in that, The air duct assembly also includes a heat exchanger disposed within the housing, the heat exchanger being disposed corresponding to the front air outlet of the centrifugal fan, and / or the heat exchanger being disposed corresponding to the lower air outlet of the centrifugal fan.

15. The air duct assembly according to claim 14, characterized in that, The housing includes a partition plate that divides the interior of the housing into a heat exchange chamber and a fan chamber along the front-to-back direction. The heat exchanger is disposed in the heat exchange chamber, and the centrifugal fan and the cross-flow fan are disposed in the fan chamber. The front side wall of the heat exchange chamber is provided with a communication port connecting the external environment and the heat exchange chamber. At least one of the front air outlet of the centrifugal fan, the front air inlet of the centrifugal fan, and the front air outlet of the cross-flow fan is disposed in the partition plate.

16. An air conditioning device, characterized in that, Includes the air duct assembly as described in any one of claims 1-15.

17. The air conditioning device according to claim 16, characterized in that, The air conditioning equipment is a ducted air conditioner.

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