Air conditioner indoor unit, air conditioner and control method

Abstract

The application discloses an air conditioner indoor unit, an air conditioner and a control method. The air conditioner indoor unit comprises a cabinet body, a heat exchanger, a centrifugal fan and a shaft flow fan which are arranged in the cabinet body. The centrifugal fan is arranged on the upper side of the heat exchanger, and the shaft flow fan is arranged on the lower side of the heat exchanger. The cabinet body is further provided with a first air duct and a second air duct. The first air duct is communicated with the centrifugal fan, and the second air duct is communicated with the shaft flow fan. By arranging the centrifugal fan and the shaft flow fan on the upper and lower sides of the heat exchanger respectively and adopting the mode of independent air ducts for guiding air flow of each fan, the cooperative work of two fans with different characteristics is realized, so that the indoor air flow distribution is improved, and the temperature stratification phenomenon is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning cabinet unit, an air conditioner and a control method. Background Art

[0002] Distributed air supply technology in air conditioning systems has gained widespread market recognition for its unique shower-like cooling and carpet-like heating properties. This all-upper- and all-downer-air distribution design improves indoor thermal circulation and airflow distribution, increasing the efficient utilization of indoor energy and thus better meeting user comfort needs.

[0003] Currently, air conditioners that achieve full-up and full-down airflow typically use a two-stage centrifugal fan as their power output device. The airflow generated by these air conditioners tends to be localized, making it difficult to achieve effective indoor air circulation. This can cause indoor temperature stratification and affect user comfort. Summary of the Invention

[0004] The main purpose of the present invention is to provide an air-conditioning cabinet unit, an air conditioner and a control method to solve the above technical problems.

[0005] In a first aspect, the present invention provides an air-conditioning cabinet unit, comprising: a cabinet body, in which a heat exchanger, a centrifugal fan and an axial fan are arranged; the centrifugal fan is arranged on the upper side of the heat exchanger, and the axial fan is arranged on the lower side of the heat exchanger; a first air duct and a second air duct are also arranged in the cabinet body; the first air duct is connected to the centrifugal fan, and the second air duct is connected to the axial fan.

[0006] Wherein, the first air duct includes an upper air duct and a lower air duct;

[0007] The upper air duct and the lower air duct are connected to each other, and the centrifugal fan is arranged in the upper air duct;

[0008] The downwind duct is an S-shaped duct, and the S-shaped duct satisfies: 0.33≤Δy / L≤0.35, wherein Δy is the horizontal distance from the starting position to the end position of the center line of the S-shaped duct, and L is the vertical height of the S-shaped duct.

[0009] The center line of the S-shaped air duct satisfies the curve equation: y=y0+B1*x+B2*x 2 +B3*x 3 , where the intersection of the center lines of the upwind duct and the downwind duct is the coordinate origin, the y-axis is vertically upward and coincides with the center line of the upwind duct, the x-axis is horizontal to the right, y represents the vertical coordinate, x represents the horizontal coordinate, y0, B1, B2 and B3 are curve coefficients.

[0010] When -L≤y≤0 and 0≤x≤Δy, the curve coefficients satisfy: y0=-5.09547±5.64171, B1=-4.4731±0.3763, B2=0.04643±0.00659, B3=-2.3613×10 -4 ±3.14656×10 -5 .

[0011] The axial flow fan comprises: a fan hub and main blades arranged on the outer periphery of the fan hub, wherein the tip profile of the main blade is a symmetrical double-arc structure;

[0012] A guide auxiliary fan blade is circumferentially arranged on the fan hub, and the guide auxiliary fan blade is used to guide the airflow to impact the trailing edge of the main fan blade.

[0013] The top and bottom ends of the centrifugal fan are respectively provided with air outlets, and the air outlets are respectively provided with a first wind shield component and a second wind shield component.

[0014] Wherein, the heat exchanger comprises a first heat exchange section and a second heat exchange section distributed up and down;

[0015] An air inlet is provided on the rear side of the cabinet, and the first heat exchange section is provided on the air flow channel between the air inlet and the centrifugal fan;

[0016] The second heat exchange section is arranged above the axial flow fan.

[0017] The top of the first air duct and the second air duct are respectively provided with an upwind outlet, and the bottom of the first air duct and the second air duct are respectively provided with a downwind outlet;

[0018] The upper air port of the first air duct is adjacent to the upper air port of the second air duct, and the lower air port of the first air duct is adjacent to the lower air port of the second air duct.

[0019] In a second aspect, the present invention further provides an air conditioner, comprising: an air conditioner outdoor unit and an air conditioner indoor unit as described in the first aspect, and also comprising: a refrigerant pipeline; the refrigerant pipeline comprises a liquid pipe and a gas pipe connecting the air conditioner outdoor unit and the air conditioner indoor unit.

[0020] In a third aspect, the present invention further provides a control method for an air conditioner, which is applied to the air conditioner according to the second aspect, and comprises the following steps:

[0021] In cooling mode:

[0022] Controlling the first wind shield assembly at the top of the centrifugal fan to open, and controlling the second wind shield assembly at the bottom of the centrifugal fan to close;

[0023] Controlling the first portion of airflow to enter from the rear side of the cabinet, sequentially passing through the first heat exchange section for heat exchange, and being accelerated by the centrifugal fan before being discharged from the upper air outlet of the first air duct;

[0024] Controlling the second portion of airflow to enter from the downwind port of the second air duct, sequentially passing through the axial flow fan for acceleration, the second heat exchange section for heat exchange, and then being discharged from the upwind port of the second air duct;

[0025] In heating mode:

[0026] controlling the first windshield assembly to close, and controlling the second windshield assembly to open;

[0027] Controlling the first portion of airflow to enter from the rear side of the cabinet, sequentially passing through the first heat exchange section for heat exchange, and then accelerating the centrifugal fan, to enter the downwind duct of the first air duct, and to be discharged from the downwind outlet of the first air duct;

[0028] The second part of the air flow is controlled to enter from the upper air port of the second air duct, pass through the second heat exchange section in sequence for heat exchange, and be accelerated by the axial flow fan before being discharged from the lower air port of the second air duct.

[0029] The beneficial technical effect of this invention is that by installing centrifugal fans and axial flow fans on the upper and lower sides of the heat exchanger, respectively, and using independent air ducts to guide the airflow of each, the two fans with different characteristics work together to improve indoor air distribution and effectively avoid temperature stratification. Centrifugal fans have the characteristics of high air pressure and long air delivery distance, while axial flow fans have high air flow and spiral divergence. The rational combination of the two greatly improves the overall performance of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of a cabinet body and components within an air conditioner cabinet provided by an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the airflow direction when the air is discharged from the upper part of the cabinet of the air conditioner provided by an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of the airflow direction when the air is discharged from the middle and lower parts of the cabinet unit of the air conditioner provided by an embodiment of the present invention;

[0034] Figure 4A schematic diagram of the upper and lower air ducts of the first air duct in the indoor air conditioner provided by an embodiment of the present invention;

[0035] Figure 5 A schematic diagram of the main blades and guide auxiliary blades of an axial flow fan in an air conditioner cabinet unit provided by an embodiment of the present invention;

[0036] Figure 6 A schematic diagram of the tip profile of a main fan blade in an air conditioner cabinet unit provided by an embodiment of the present invention;

[0037] Figure 7 A schematic diagram of the air conditioner framework provided by an embodiment of the present invention;

[0038] Figure 8 A schematic diagram of cooling mode steps in a control method for an air conditioner provided by an embodiment of the present invention;

[0039] Figure 9 A schematic diagram of the heating mode steps in the control method for an air conditioner provided by an embodiment of the present invention.

[0040] Description of reference numerals:

[0041] In the figure: 10-cabinet, 11-air inlet, 20-heat exchanger, 21-first heat exchange section, 22-second heat exchange section, 30-centrifugal fan, 40-axial fan, 41-main fan blade, 42-guide auxiliary fan blade, 43-fan hub, 50-first air duct, 51-upper air duct, 52-lower air duct, 53-upper air outlet of the first air duct, 54-lower air outlet of the first air duct, 60-second air duct, 61-upper air outlet of the second air duct, 62-lower air outlet of the second air duct, 71-first wind shield assembly, 72-second wind shield assembly, 80-air conditioner, 81-air conditioner outdoor unit, 82-air conditioner cabinet unit, 83-liquid pipe, 84-gas pipe. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0044] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0045] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0046] like Figures 1 to 3 As shown, Figure 1 A schematic diagram of a cabinet body and components within an air conditioner cabinet provided by an embodiment of the present invention; Figure 2 A schematic diagram of the airflow direction when the air is discharged from the upper part of the cabinet of the air conditioner provided by an embodiment of the present invention; Figure 3 A schematic diagram of the airflow direction of an air conditioner cabinet unit with center-bottom air outlet provided by an embodiment of the present invention. An air conditioner cabinet unit 82 provided by an embodiment of the present invention includes: a cabinet body 10, within which is disposed a heat exchanger 20, a centrifugal fan 30, and an axial flow fan 40; the centrifugal fan 30 is disposed above the heat exchanger 20, and the axial flow fan 40 is disposed below the heat exchanger 20; a first air duct 50 and a second air duct 60 are also disposed within the cabinet body 10; the first air duct 50 is in communication with the centrifugal fan 30, and the second air duct 60 is in communication with the axial flow fan 40.

[0047] In this embodiment, based on the characteristics of the centrifugal fan 30 having high wind pressure and long air supply distance, arranging it in the upper position inside the cabinet 10 can shorten the path length of the air supply to the upper air outlet 53 of the first air duct, thereby reducing the resistance along the way. The reduction in resistance along the way means that the resistance that the centrifugal fan 30 needs to overcome is reduced, and a larger air supply volume can be obtained under the same power consumption.

[0048] The axial flow fan 40 has the characteristics of large flow coefficient and simple structure. Its spiral divergent air supply characteristics are particularly suitable for promoting air circulation. Placing it in the lower part of the cabinet 10 can effectively accelerate the air flow in the lower space of the room, helping to break the stratification of the indoor air.

[0049] The centrifugal fan 30 is arranged on the upper side of the heat exchanger 20, and the axial flow fan 40 is arranged on the lower side of the heat exchanger 20. This layout can fully utilize the respective advantages of the two fans.

[0050] Specifically, a first air duct 50 and a second air duct 60 are further provided in the cabinet 10. The first air duct 50 is connected to the centrifugal fan 30 for guiding the airflow generated by the centrifugal fan 30; the second air duct 60 is connected to the axial flow fan 40 for guiding the airflow generated by the axial flow fan 40.

[0051] This arrangement essentially achieves a synergistic effect of "1+1>2" by rationally configuring two fans with different characteristics, which not only ensures the long-distance air supply capability, but also improves the indoor air circulation effect, thereby comprehensively improving the performance of the air conditioner.

[0052] In this embodiment, if Figure 2 As shown, when the air conditioner is in cooling mode, the first windshield assembly 71 is open and the second windshield assembly 72 is closed. Air enters from the rear side of the cabinet 10, flows through the first heat exchange section 21 of the heat exchanger 20 for heat exchange, and then enters the centrifugal fan 30 at the upper position. After being accelerated here, the airflow is sent out through the upper air outlet 53 of the first air duct.

[0053] At the same time, another part of the airflow enters from the bottom, is first accelerated by the axial flow fan 40, then passes through the second heat exchange section 22 of the heat exchanger 20 for heat exchange, and is finally sent out from the upper air port 61 of the second air duct.

[0054] In this embodiment, if Figure 3 As shown, when the air conditioner is in heating mode, the first wind shield assembly 71 is closed and the second wind shield assembly 72 is open. At this time, the airflow entering from the rear side of the cabinet 10 passes through the first heat exchange section 21 of the heat exchanger 20, is accelerated by the centrifugal fan 30, enters the downwind duct 52 of the first air duct 50, and is finally discharged from the downwind outlet thereof.

[0055] The other airflow enters from the upper air port 61 of the second air duct, passes through the second air duct 60 and the second heat exchange section 22 of the heat exchanger 20 for heat exchange, then passes through the axial flow fan 40 at the lower position for acceleration, and finally is sent out from the lower air port 62 of the second air duct.

[0056] In one embodiment, if Figure 4 As shown, Figure 4 A schematic diagram of the upper and lower ducts of the first air duct in an indoor air conditioner provided in an embodiment of the present invention. First air duct 50 includes an upper duct 51 and a lower duct 52; upper duct 51 and lower duct 52 are interconnected, with centrifugal fan 30 disposed within upper duct 51. Lower duct 52 is an S-shaped duct satisfying the following: 0.33 ≤ Δy / L ≤ 0.35, where Δy is the horizontal distance from the centerline of the S-shaped duct to its endpoint, and L is the vertical height of the S-shaped duct.

[0057] In this embodiment, if Figure 4 As shown in the figure, the S-shaped duct adopts a gradual curvature design, which not only adapts to the space constraints within the air conditioning cabinet, but also reduces the problem of excessive local pressure caused by excessive duct deflection. Through reasonable curvature control, the separation of airflow at the bend can be effectively reduced, reducing flow losses and thus improving air supply efficiency.

[0058] from Figure 4 As can be seen in the figure, Δy is marked below the first air duct 50 and represents the horizontal offset of the S-shaped air duct, that is, the horizontal distance from the starting point to the end point of the centerline of the S-shaped air duct. L is marked on the left side of the first air duct 50 and represents the vertical height of the S-shaped air duct.

[0059] L and Δy constitute the parameters that describe the main geometric characteristics of the S-shaped air duct. The ratio of the two (Δy / L) is controlled within the range of 0.33≤Δy / L≤0.35. From a geometric perspective, this ratio of 0.33≤Δy / L≤0.35 actually controls the "steepness" of the S-shaped air duct.

[0060] If the downwind duct 52 is regarded as an S-shaped curve:

[0061] When the Δy / L ratio is too large, it means that a large horizontal displacement needs to be completed in a short vertical distance, and the curve will be too steep;

[0062] When the Δy / L ratio is too small, it means that a long vertical distance is required to complete the horizontal displacement, which will take up too much space.

[0063] Therefore, this ratio range is determined based on the following considerations: ensuring that the airflow can turn smoothly and avoiding flow separation caused by overly steep bends.

[0064] In one embodiment, the center line of the S-shaped air duct satisfies the curve equation: y=y0+B1*x+B2*x 2 +B3*x 3 , where the intersection of the center lines of the upper duct and the lower duct is the coordinate origin, the y-axis is vertically upward and coincides with the center line of the upper duct, the x-axis is horizontal to the right, y represents the vertical coordinate, x represents the horizontal coordinate, y0, B1, B2 and B3 are curve coefficients.

[0065] In this embodiment, if Figure 4 As shown, the center line of the S-shaped air duct is designed using a cubic curve equation, and the center line satisfies the following equation: y = y0 + B1*x + B2*x 2 +B3*x 3 ;

[0066] Among them, when -L≤y≤0, and 0≤x≤Δy, the value ranges of each parameter are: y0 value range: -5.09547±5.64171, B1 value range: -4.4731±0.3763, B2 value range: 0.04643±0.00659, B3 value range: -2.3613×10 -4 ±3.14656×10 -5 .

[0067] In this equation, x and y represent coordinate values ​​in a two-dimensional coordinate system. The origin of the coordinate system is at the intersection of the center lines of the upwind duct 51 and the downwind duct 52. The y-axis is vertically upward and coincides with the center line of the upwind duct 51. The x-axis is horizontal to the right. In this equation, y changes with the change of x.

[0068] By setting the coordinate system with the intersection of the upper and lower air ducts 52 as the origin, the curved trajectory of the center line of the S-shaped air duct can be accurately described.

[0069] In this coordinate system, L represents the vertical height of the S-shaped air duct, and Δy represents the horizontal distance between the starting point and the end point of the center line of the S-shaped air duct.

[0070] y0 is the initial value, and B1, B2, and B3 are the coefficients of the linear, quadratic, and cubic terms, respectively. The range of these parameters provides a certain tolerance for the manufacturing process, ensuring that the S-shaped duct maintains stable performance in actual production.

[0071] In a specific embodiment, the design of the S-shaped air duct fully considers the airflow motion characteristics. Specifically, a smooth transition design is adopted on both the inner and outer curved surfaces of the S-shaped air duct.

[0072] In addition, the cross-sectional area of ​​the S-shaped air duct remains constant along the way, which is conducive to the stable flow of air.

[0073] In the term "along-the-path cross-sectional area," "along-the-path" refers to the path along which the airflow flows, and "cross-sectional area" refers to the area of ​​the cross section perpendicular to the direction of the airflow. Therefore, the "along-the-path cross-sectional area" refers to the cross-sectional area perpendicular to the direction of the airflow at every location along the airflow path.

[0074] For example: If you regard the S-shaped air duct as a curved pipe, and cut a knife perpendicular to the direction of airflow at any point in the pipe, the area of ​​the surface cut out by this knife is the cross-sectional area at that position.

[0075] "The cross-sectional area remains constant along the way" means that from the inlet to the outlet of the S-shaped air duct, the area obtained by cutting the pipe at any position will be the same.

[0076] If the cross-sectional area changes suddenly along the way (suddenly becomes larger or smaller), it will cause a sudden change in the airflow velocity; the change in cross-sectional area may also cause airflow separation, vortex generation and other unstable phenomena; keeping the cross-sectional area constant will help the airflow flow smoothly.

[0077] In one embodiment, the axial flow fan 40 includes: a fan hub 43 and main fan blades 41 arranged on the outer periphery of the fan hub 43, and the tip profile of the main fan blades 41 is a symmetrical double-arc structure; the fan hub 43 is provided with guide auxiliary fan blades 42 along the circumference, and the guide auxiliary fan blades 42 are used to guide the airflow to impact the trailing edge of the main fan blades 41.

[0078] In this embodiment, if Figure 5 and Figure 6 As shown, Figure 5 A schematic diagram of the main blades and guide auxiliary blades of an axial flow fan in an air conditioner cabinet unit provided by an embodiment of the present invention; Figure 6 To achieve high efficiency in both bidirectional flow, the axial flow fan 40 uses double-ended blades with comparable forward and reverse efficiency, including a main blade 41 and a guide blade 42.

[0079] The main fan blades 41 are evenly arranged along the circumference of the fan hub 43 , and the blade tip profile of the main fan blades 41 is designed to be a symmetrical double-arc structure.

[0080] Specifically, the cross section of the main fan blade 41 at the tip (ie, the cross section at the outermost edge of the blade) is designed to be a symmetrical double-arc structure, presenting a shape feature similar to the infinity symbol “∞”.

[0081] This design overcomes the problem of low efficiency of the conventional axial flow fan 40 during reverse rotation, and achieves the characteristic of equal efficiency in forward and reverse rotation.

[0082] The guide vanes 42 are evenly arranged along the circumference of the fan hub 43, and their number corresponds to the number of the main vanes 41. The main function of these guide vanes 42 is to guide the airflow to impact the trailing edge of the main vanes 41.

[0083] Specifically, when the axial flow fan 40 is working, the guide auxiliary blades 42 rotate together with the hub, pre-swirl the airflow during the rotation process, and make the airflow hit the trailing edge of the main blade 41 at a suitable angle.

[0084] This design enhances the kinetic energy at the trailing edge of the main fan blade 41 and improves the work capacity of the fan blade; at the same time, the aerodynamic separation phenomenon at the trailing edge of the main fan blade 41 is slowed down through the guiding effect of the guide auxiliary fan blade 42.

[0085] In one embodiment, the top and bottom ends of the centrifugal fan 30 are respectively provided with air outlets, and the air outlets are respectively provided with a first wind shielding component 71 and a second wind shielding component 72.

[0086] In this embodiment, if Figure 3 As shown, the structural design of the centrifugal fan 30 fully considers the air supply requirements under different working modes. Specifically, the top and bottom ends of the centrifugal fan 30 are respectively provided with air outlets to adapt to different air supply direction requirements.

[0087] Wind shield components (a first wind shield component and a second wind shield component) are respectively provided at these air outlets. By controlling the opening and closing states of the wind shield components, the direction of the airflow can be adjusted.

[0088] Through the dual air outlet settings at the top and bottom, combined with the control of the wind shield component, you can choose to supply air upward or downward as needed.

[0089] In a specific application, for example, when the air conditioner is working in cooling mode, the first wind shielding component 71 of the top air outlet can be opened and the second wind shielding component 72 of the bottom air outlet can be closed to achieve upward air supply;

[0090] When working in heating mode, the on / off state of the wind shield component can be adjusted accordingly to achieve downward air supply. This flexible air supply method can better meet the user's air supply needs in different working modes.

[0091] In one embodiment, the first and second windshield assemblies 71 and 72 each include a baffle, a rotating shaft, and a drive motor (not shown). The baffles are positioned at their corresponding air outlets via the rotating shafts, and the output shafts of the drive motors are connected to the rotating shafts to drive the baffles. This design allows the air outlets to be opened and closed by rotating the baffles.

[0092] In a specific embodiment, the baffle is made of a lightweight and durable material, and its surface is treated to prevent dust. The rotating shaft is connected to the driving motor through a coupling to achieve reciprocating rotation of the baffle.

[0093] In one embodiment, the heat exchanger 20 includes a first heat exchange section 21 and a second heat exchange section 22 distributed up and down; an air inlet 11 is provided on the rear side of the cabinet 10, and the first heat exchange section 21 is provided on the air flow channel between the air inlet 11 and the centrifugal fan 30; the second heat exchange section 22 is provided above the axial flow fan 40.

[0094] In this embodiment, if Figure 2 As shown, the heat exchanger 20 includes a first heat exchange section 21 and a second heat exchange section 22 connected to each other, and the first heat exchange section 21 is located above the second heat exchange section 22. The purpose of this design is to cooperate with the dual-fan layout of the cabinet 10 to improve heat exchange efficiency.

[0095] An air inlet 11 is provided at the rear of the cabinet 10 for introducing air. A first heat exchange section 21 is provided in the airflow path between the air inlet 11 and the centrifugal fan 30. In other words, air entering through the air inlet 11 first passes through the first heat exchange section 21 for heat exchange before entering the centrifugal fan 30.

[0096] Such an arrangement can ensure that the airflow entering the centrifugal fan 30 has completed preliminary heat exchange.

[0097] The second heat exchange section 22 is disposed above the axial flow fan 40. When the airflow passes through the axial flow fan 40 and enters the second air duct 60, it exchanges heat with the second heat exchange section 22.

[0098] This arrangement enables sufficient heat exchange when the airflow passes through the second air duct 60 .

[0099] This segmented arrangement of the heat exchanger 20 enables the airflow to obtain effective heat exchange when passing through different air ducts; at the same time, it rationally utilizes the space inside the air-conditioning cabinet, making the layout of the heat exchanger 20 and the dual fans more compact.

[0100] It should be noted that, although the first heat exchange section 21 and the second heat exchange section 22 are distinguished in physical position, they together constitute a complete heat exchange component.

[0101] This design not only ensures the heat exchange effect, but also meets the requirements of the structural layout inside the air-conditioning cabinet 10.

[0102] In one embodiment, the top of the first air duct 50 and the second air duct 60 are respectively provided with an upper air outlet, and the bottom end is respectively provided with a lower air outlet; the upper air outlet 53 of the first air duct is adjacent to the upper air outlet 61 of the second air duct, and the lower air outlet 54 of the first air duct is adjacent to the lower air outlet 62 of the second air duct.

[0103] In this embodiment, if Figure 2 As shown, in order to make the air outlets of the two air ducts cooperate with each other, the upper air outlet 53 of the first air duct and the upper air outlet 61 of the second air duct are arranged adjacent to each other. Similarly, the lower air outlet 54 of the first air duct and the lower air outlet 62 of the second air duct are also arranged adjacent to each other.

[0104] This arrangement improves the indoor thermal circulation effect and air flow distribution. The centrifugal fan 30 has the characteristics of high wind pressure and long air delivery distance.

[0105] The airflow blown out by the centrifugal fan 30 can drive the airflow blown out by the axial flow fan 40 to flow over a long distance. This mutual cooperation improves the air supply effect.

[0106] Taking the downflow outlet as an example, the adjacent arrangement here means that the downflow outlet 54 of the first air duct and the downflow outlet 62 of the second air duct are very close in the vertical direction, which helps to increase the air supply distance. The increase in air supply distance here is mainly because the airflow blown by the centrifugal fan 30 can drive the airflow blown by the axial flow fan 40 to flow over a long distance.

[0107] This design essentially achieves a synergistic effect of "1+1>2" by rationally configuring two fans with different characteristics.

[0108] In summary, in this embodiment, by arranging the centrifugal fan 30 and the axial flow fan 40 on the upper and lower sides of the heat exchanger 20 respectively, the characteristics of the centrifugal fan 30 with high wind pressure and long air supply distance and the axial flow fan 40 with large flow coefficient and spiral divergence of air supply characteristics are fully utilized, so that the advantages of the two fans complement each other.

[0109] The centrifugal fan 30 is arranged at the upper position to shorten the air supply path, reduce the resistance along the way, and improve the air supply efficiency; the axial flow fan 40 is arranged at the lower position to effectively accelerate the air flow in the lower space.

[0110] At the same time, the first air duct 50 and the second air duct 60 are respectively connected to the centrifugal fan 30 and the axial flow fan 40, and are arranged in a manner that the upper and lower air outlets are adjacent to each other.

[0111] The high-pressure airflow from centrifugal fan 30 drives the spiral airflow generated by axial fan 40, creating a synergistic effect of "1+1>2." The adjacent placement of the upper and lower air outlets further enhances the interaction between the two airflows, improving the air delivery efficiency.

[0112] In addition, the downwind duct 52 of the first duct 50 adopts an S-shaped design, combined with reasonable curvature control (0.33≤Δy / L≤0.35), which not only adapts to space limitations but also avoids airflow separation caused by overly steep bends.

[0113] The axial flow fan 40 adopts a design in which the main blades 41 and the guide auxiliary blades 42 are coordinated. Through the pre-rotation effect of the guide auxiliary blades 42, the airflow impacts the trailing edge of the main blades 41 at a suitable angle, thereby improving the efficiency of the axial flow fan 40.

[0114] like Figure 7 As shown, corresponding to the above-mentioned indoor air conditioner 82, an embodiment of the present invention further provides an air conditioner 80. The air conditioner 80 includes: an outdoor air conditioner 81 and an indoor air conditioner 82 as described in any of the above-mentioned embodiments, and further includes: a refrigerant pipeline; the refrigerant pipeline includes a liquid pipe 83 and a gas pipe 84 connecting the outdoor air conditioner 81 and the indoor air conditioner 82.

[0115] In this embodiment, the air conditioner outdoor unit 81 is arranged outdoors, and the air conditioner indoor unit 82 is arranged indoors. Specifically, the air conditioner outdoor unit 81 includes an outdoor unit housing, in which a compressor, an outdoor heat exchanger, an outdoor fan and a four-way reversing valve (not shown in the drawings) are arranged.

[0116] In this embodiment, the air conditioner outdoor unit 81 is connected to the air conditioner indoor unit 82 via a refrigerant pipeline, and the refrigerant pipeline includes a liquid pipe 83 and a gas pipe 84.

[0117] Liquid pipe 83 and gas pipe 84 connect the outdoor heat exchanger of air conditioner outdoor unit 81 and the heat exchanger of air conditioner indoor unit 82, respectively, forming a refrigerant circulation loop. Both liquid pipe 83 and gas pipe 84 are equipped with quick connectors (not shown in the figures). The quick connectors include a valve core and a sealing ring (not shown in the figures), which facilitate rapid connection of the pipes during installation and maintenance.

[0118] Specifically, when air conditioner 80 is operating in cooling mode, the refrigerant is compressed into a high-temperature, high-pressure gaseous refrigerant by the compressor. After passing through the four-way reversing valve, it enters the outdoor heat exchanger, exchanges heat with the outdoor air, and condenses into liquid refrigerant. It then enters indoor air conditioner unit 82 through liquid pipe 83. After throttling, the refrigerant enters the heat exchanger, expands, exchanges heat with the indoor air, and then returns to the outdoor unit through gas pipe 84.

[0119] When air conditioner 80 is operating in heating mode, the four-way reversing valve switches the refrigerant flow direction, with the indoor heat exchanger acting as the condenser and the outdoor heat exchanger as the evaporator. The high-temperature, high-pressure refrigerant compressed by the compressor enters the indoor heat exchanger directly, exchanging heat with the indoor air, thereby heating the room.

[0120] In this embodiment, the coordinated operation of the centrifugal fan 30 and the axial fan 40 in the air-conditioning cabinet unit 82, through the reasonable arrangement of the dual air ducts, can significantly improve the indoor air flow distribution, avoid temperature stratification, and improve user comfort.

[0121] like Figure 8 and Figure 9 As shown, corresponding to the above air conditioner 80, an embodiment of the present invention further provides a control method for an air conditioner, which can be applied to the air conditioner 80 of any of the above embodiments. The control method includes the following steps S100 to S220:

[0122] In cooling mode:

[0123] S100, controlling the first wind shield assembly 71 at the top of the centrifugal fan 30 to open, and controlling the second wind shield assembly 72 at the bottom of the centrifugal fan 30 to close;

[0124] S110, controlling the first portion of airflow to enter from the rear side of the cabinet 10, sequentially passing through the first heat exchange section 21 for heat exchange, and being accelerated by the centrifugal fan 30, and then being discharged from the upper air outlet 53 of the first air duct;

[0125] S120, controlling the second portion of air flow to enter from the lower air port 62 of the second air duct, accelerate through the axial flow fan 40, undergo heat exchange in the second heat exchange section 22, and then be discharged from the upper air port 61 of the second air duct;

[0126] In heating mode:

[0127] S200, controlling the first wind shield assembly 71 to close, and controlling the second wind shield assembly 72 to open;

[0128] S210: Control the first portion of airflow to enter from the rear side of the cabinet 10, pass through the first heat exchange section 21 for heat exchange, and be accelerated by the centrifugal fan 30 before entering the downwind duct 52 of the first air duct 50 and being discharged from the downwind port 54 of the first air duct;

[0129] S220, control the second part of the air flow to enter from the upper air port 61 of the second air duct, pass through the second heat exchange section 22 for heat exchange, and be accelerated by the axial flow fan 40 before being discharged from the lower air port 62 of the second air duct.

[0130] In this embodiment, the control method employs different control strategies for cooling and heating modes to achieve optimal air delivery. Specifically, when the air conditioner 80 is operating in cooling mode, the first air shield assembly 71 at the top of the centrifugal fan 30 is initially controlled to be open, while the second air shield assembly 72 at the bottom of the centrifugal fan 30 is simultaneously controlled to be closed. This combination of air shield assembly controls ensures that airflow is delivered upward during cooling, achieving a shower-like cooling effect.

[0131] The first part of the airflow enters the interior of the cabinet 10 from the rear side of the cabinet 10. This part of the airflow first passes through the first heat exchange section 21 arranged between the air inlet 11 and the centrifugal fan 30 for heat exchange, and the temperature is reduced after the heat exchange. Subsequently, the airflow with reduced temperature enters the centrifugal fan 30 located at the top. The centrifugal fan 30 accelerates the airflow by virtue of its high wind pressure characteristics, and finally discharges it from the upper wind port 53 of the first air duct. This airflow organization method fully utilizes the characteristics of the centrifugal fan 30 with high wind pressure and long air supply distance, and can quickly transport cold air to a farther distance.

[0132] At the same time, a second portion of airflow is controlled to enter through the lower vent 62 of the second air duct. This portion of airflow is first accelerated by the axial flow fan 40, increasing its velocity. The accelerated airflow then flows through the second heat exchange section 22 for heat exchange, where its temperature decreases, before finally being discharged through the upper vent 61 of the second air duct. This arrangement utilizes the high flow rate of the axial flow fan 40 to achieve a good cooling effect in a localized area. The synergistic effect of the two airflows effectively improves the indoor temperature distribution.

[0133] When the air conditioner 80 is operating in the heating mode, first, the first wind shielding assembly 71 is controlled to be closed, and the second wind shielding assembly 72 is controlled to be opened. This control method ensures that the warm air flow can be transported downward.

[0134] In this mode, the first portion of airflow is controlled to enter from the rear side of the cabinet 10. This airflow first passes through the first heat exchange section 21 for heat exchange, where its temperature rises. It is then accelerated by the centrifugal fan 30. Unlike in the cooling mode, this accelerated airflow is directed into the lower duct 52 (S-shaped duct) of the first air duct 50 and ultimately exhausted through the lower duct outlet 54. This design fully considers the flow characteristics of hot air.

[0135] At the same time, the second portion of airflow is controlled to enter through the upper air port 61 of the second air duct. This airflow first passes through the second heat exchange section 22 for heat exchange, where its temperature rises. It is then accelerated by the axial flow fan 40 and ultimately discharged through the lower air port 62 of the second air duct. This organization creates a bottom-up circulation of hot airflow, improving the heating effect.

[0136] This dual-duct, dual-fan collaborative control method, by rationally allocating the airflow path and adjusting the opening and closing status of the wind shield component, not only achieves "shower-style" air supply during cooling and "carpet-style" air supply during heating, but also effectively solves the temperature stratification problem existing in traditional air conditioners 80, significantly improving the overall performance of the air conditioner 80 and user comfort.

[0137] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. An air conditioner cabinet unit, characterized in that: include: A cabinet body is provided with a heat exchanger, a centrifugal fan, and an axial flow fan; the centrifugal fan is provided on the upper side of the heat exchanger, and the axial flow fan is provided on the lower side of the heat exchanger; a first air duct and a second air duct are also provided in the cabinet body; the first air duct is connected to the centrifugal fan, and the second air duct is connected to the axial flow fan; The first air duct includes an upper air duct and a lower air duct; the upper air duct and the lower air duct are connected to each other, and the centrifugal fan is arranged in the upper air duct; the lower air duct is an S-shaped air duct, and the S-shaped air duct satisfies: 0.33≤Δy / L≤0.35, wherein Δy is the horizontal distance from the starting position to the end position of the center line of the S-shaped air duct, and L is the vertical height of the S-shaped air duct.

2. The air conditioner cabinet unit according to claim 1, characterized in that: The center line of the S-shaped air duct satisfies the curve equation: , where the intersection of the center lines of the upwind duct and the downwind duct is the coordinate origin, the y-axis is vertically upward and coincides with the center line of the upwind duct, the x-axis is horizontal to the right, y represents the vertical coordinate, x represents the horizontal coordinate, y0, B1, B2 and B3 are curve coefficients.

3. The air conditioner cabinet unit according to claim 2, characterized in that: When -L≤y≤0 and 0≤x≤Δy, the curve coefficients satisfy: 、 、 、 .

4. The air conditioner cabinet unit according to claim 1, characterized in that: The axial flow fan includes: a fan hub and main fan blades arranged on the outer periphery of the fan hub, and the tip profile of the main fan blade is a symmetrical double-arc structure; the fan hub is provided with guide auxiliary fan blades along the circumference, and the guide auxiliary fan blades are used to guide the airflow to impact the trailing edge of the main fan blade.

5. The air conditioner cabinet unit according to claim 1, characterized in that: The top and bottom ends of the centrifugal fan are respectively provided with air outlets, and the air outlets are respectively provided with a first wind shield component and a second wind shield component.

6. The air conditioner cabinet unit according to claim 1, characterized in that: The heat exchanger includes a first heat exchange section and a second heat exchange section distributed up and down; an air inlet is provided on the rear side of the cabinet, and the first heat exchange section is provided on the air flow channel between the air inlet and the centrifugal fan; the second heat exchange section is provided above the axial flow fan.

7. The air conditioner indoor unit according to claim 1, characterized in that: The top of the first air duct and the second air duct are respectively provided with an upwind opening, and the bottom end is respectively provided with a downwind opening; the upwind opening of the first air duct is adjacent to the upwind opening of the second air duct, and the downwind opening of the first air duct is adjacent to the downwind opening of the second air duct.

8. An air conditioner, characterized in that: include: The air conditioner outdoor unit and the air conditioner indoor unit according to any one of claims 1 to 7, further comprising: a refrigerant pipeline; The refrigerant pipeline includes a liquid pipe and a gas pipe connecting the air conditioner outdoor unit and the air conditioner indoor unit.

9. A control method for an air conditioner, characterized in that: The method is applied to the air conditioner according to claim 8, comprising the following steps: In cooling mode: Controlling the first wind shield assembly at the top of the centrifugal fan to open, and controlling the second wind shield assembly at the bottom of the centrifugal fan to close; Controlling the first portion of airflow to enter from the rear side of the cabinet, sequentially passing through the first heat exchange section for heat exchange, and being accelerated by the centrifugal fan before being discharged from the upper air outlet of the first air duct; Controlling the second portion of air flow to enter from the downwind port of the second air duct, passing through the axial flow fan for acceleration, the second heat exchange section for heat exchange, and then being discharged from the upwind port of the second air duct; In heating mode: controlling the first windshield assembly to close, and controlling the second windshield assembly to open; Controlling the first portion of airflow to enter from the rear side of the cabinet, sequentially passing through the first heat exchange section for heat exchange, and then accelerating the centrifugal fan, to enter the downwind duct of the first air duct, and to be discharged from the downwind outlet of the first air duct; The second part of the air flow is controlled to enter from the upper air port of the second air duct, pass through the second heat exchange section in sequence for heat exchange, and be accelerated by the axial flow fan before being discharged from the lower air port of the second air duct.

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