Air conditioner cabinet inner unit, air conditioner and control method

Abstract

The invention discloses an air conditioner cabinet indoor unit, an air conditioner and a control method. The air conditioner cabinet indoor unit comprises a cabinet body, and a heat exchanger, a centrifugal fan and an axial flow fan are arranged in the cabinet body; the centrifugal fan is arranged on the upper side of the heat exchanger, and the axial flow 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 channel communicates with the centrifugal fan, and the second air channel communicates with the axial flow fan. The centrifugal fan and the axial flow fan are arranged on the upper side and the lower side of the heat exchanger respectively, the independent air channels are adopted to guide respective airflow, cooperative work of the two fans with different characteristics is achieved, indoor airflow 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] The distributed air supply technology in the air conditioning system has been well recognized in the market due to its unique shower-style cooling and carpet-style heating characteristics. This all-up and all-down air outlet design is conducive to improving indoor thermal flow circulation and airflow distribution, increasing the effective utilization rate of indoor energy, and thus better meeting the comfort needs of users.

[0003] At present, air conditioners that realize full-up and full-down air outlet functions usually use two-stage centrifugal fans as power output devices. The airflow movement generated by the air conditioner during operation tends to be localized, making it difficult to form effective indoor air circulation, causing indoor temperature stratification and affecting the user's comfort experience. 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 flow fan are arranged; the centrifugal fan is arranged on the upper side of the heat exchanger, and the axial flow fan is arranged on the lower side of the heat exchanger; the cabinet body is also provided with a first air duct and a second air duct; the first air duct is connected to the centrifugal fan, and the second air duct is connected to the axial flow 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 , wherein the intersection of the center lines of the upper duct and the lower duct is taken as 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.

[0010] Wherein, 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, and 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] Wherein, 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 at 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] Wherein, the first air duct and the second air duct are respectively provided with an upper air outlet at the top and a lower air outlet at the bottom;

[0018] The upper air port of the first air duct is disposed adjacent to the upper air port of the second air duct, and the lower air port of the first air duct is disposed 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 as described in the second aspect, and comprises the following steps:

[0021] In cooling mode:

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

[0023] Controlling the first part of the 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, and then being discharged from the upper air outlet of the first air duct;

[0024] Controlling the second part of the air flow to enter from the lower air port of the second air duct, and then passing through the axial flow fan to accelerate and the second heat exchange section to perform heat exchange, and then being discharged from the upper air port of the second air duct;

[0025] In heating mode:

[0026] Controlling the first wind shield component to close, and controlling the second wind shield component to open;

[0027] Controlling the first part of the airflow to enter from the rear side of the cabinet, sequentially passing through the first heat exchange section for heat exchange, accelerating the centrifugal fan, entering the lower air duct of the first air duct, and being discharged from the lower air 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 the present invention is that by arranging 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 respective airflows, the coordinated work of the two fans with different characteristics is achieved, thereby improving the indoor airflow distribution and effectively avoiding the temperature stratification phenomenon. The centrifugal fan has the characteristics of high wind pressure and long air supply distance, while the axial flow fan has the characteristics of large flow and spiral divergence. The reasonable 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 accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

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

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

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

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

[0037] Figure 7 A schematic diagram of an 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] Fig. 9 A schematic diagram of the heating mode steps in the control method for an air conditioner provided in 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 flow 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

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

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

[0046] like Figures 1 to 3 As shown, Figure 1 A schematic diagram of a cabinet and components in an air conditioner cabinet provided by an embodiment of the present invention; Figure 2 A schematic diagram of the air flow direction when the air is discharged from the upper part of the air conditioner cabinet provided by an embodiment of the present invention; Figure 3 A schematic diagram of the airflow direction of the air conditioner cabinet unit when the air is discharged from the middle and lower parts of the embodiment of the present invention. An air conditioner cabinet unit 82 provided by the embodiment of the present invention comprises: a cabinet body 10, in which a heat exchanger 20, a centrifugal fan 30 and an axial flow fan 40 are arranged; 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; a first air duct 50 and a second air duct 60 are also arranged in the cabinet body 10; the first air duct 50 is connected to the centrifugal fan 30, and the second air duct 60 is connected to the axial flow fan 40.

[0047] In this embodiment, based on the characteristics of the centrifugal fan 30, which has 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 of the 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, which helps 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 communicated with the centrifugal fan 30 for guiding the airflow generated by the centrifugal fan 30; the second air duct 60 is communicated with 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 long-distance air supply capabilities, but also improves indoor air circulation effects, 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 wind shield assembly 71 is opened, the second wind shield assembly 72 is closed, and the airflow 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 port 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 shielding assembly 71 is closed and the second wind shielding assembly 72 is opened. 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 lower air duct 52 of the first air duct 50, and is finally sent out from the lower air 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 Schematic diagram of the upper and lower ducts of the first duct in the air conditioner cabinet provided by an embodiment of the present invention. The first duct 50 includes an upper duct 51 and a lower duct 52; the upper duct 51 and the lower duct 52 are interconnected, and the centrifugal fan 30 is arranged in the upper duct 51; the lower duct 52 is an S-shaped duct, satisfying: 0.33≤Δy / L≤0.35, where 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.

[0057] In this embodiment, if Figure 4 As shown in the figure, the S-shaped air duct adopts a gradual curvature design, which can not only adapt to the space limitations in the air conditioning cabinet, but also reduce the problem of excessive local pressure caused by excessive deflection of the air duct. Through reasonable curvature control, the separation of air flow at the bend can be effectively reduced, the flow loss can be reduced, and the air supply effect can be improved.

[0058] from Figure 4 As can be seen in the figure, Δy is marked below the first air duct 50, representing the horizontal offset of the S-shaped air duct, that is, the horizontal distance from the starting point to the end point of the center line of the S-shaped air duct. L is marked on the left side of the first air duct 50, representing 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, and the ratio of the two (Δy / L) is controlled within the range of 0.33≤Δy / L≤0.35. From the perspective of geometric relationship, the 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 upper air duct 51 and the lower air duct 52. The y axis is vertically upward and coincides with the center line of the upper air 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 curve 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, B1, B2, B3 are the coefficients of the first, second and third terms respectively. The range of these parameters provides a certain tolerance space for the manufacturing process, ensuring that the S-type air duct can maintain 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, the inner and outer curved surfaces of the S-shaped air duct are both designed with smooth transitions.

[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 “cross-sectional area along the way”, “along the way” 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 “cross-sectional area along the way” refers to the cross-sectional area perpendicular to the direction of the airflow at each position along the airflow path.

[0074] For example: If we regard the S-shaped air duct as a curved pipe, and make a cut perpendicular to the direction of airflow at any point in the pipe, the area of ​​the surface cut out by this cut 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), the airflow velocity will change suddenly; 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 a main fan blade 41 arranged on the outer periphery of the fan hub 43, and the tip profile of the main fan blade 41 is a symmetrical double arc structure; the fan hub 43 is provided with a guide auxiliary fan blade 42 along the circumference, and the guide auxiliary fan blade 42 is used to guide the airflow to impact the trailing edge of the main fan blade 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 provided by an embodiment of the present invention; Figure 6 Schematic diagram of the tip profile of the main fan blade in the air conditioner cabinet provided by the embodiment of the present invention. In order to achieve high efficiency in both directions, the axial flow fan 40 uses double-ended fan blades with equal forward and reverse efficiency, including main fan blades 41 and guide auxiliary fan blades 42.

[0079] The main fan blades 41 are evenly arranged along the circumference of the fan hub 43, and the 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 wind blade 41 at the tip position (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 ordinary axial flow fan 40 when it is reversed, and achieves the characteristic of equal efficiency in forward and reverse rotation.

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

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

[0084] This design enhances the kinetic energy at the trailing edge of the main wind blade 41 and improves the working capacity of the wind blade; at the same time, the aerodynamic separation phenomenon at the trailing edge of the main wind blade 41 is alleviated through the guiding effect of the guide auxiliary wind 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 in different working modes. Specifically, the top and bottom ends of the centrifugal fan 30 are respectively provided with air outlets to meet 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. The direction of the airflow can be adjusted by controlling the opening and closing states of the wind shield components.

[0088] Through the double air outlet setting 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 realize upward air supply;

[0090] When working in heating mode, the switch 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 needs for air supply in different working modes.

[0091] In a specific embodiment, the first wind shield assembly 71 and the second wind shield assembly 72 each include a baffle, a rotating shaft and a driving motor (not shown in the drawings). The baffle is arranged at the corresponding air outlet through the rotating shaft, and the output shaft of the driving motor is connected to the rotating shaft to drive the rotation of the baffle. Such a design can realize the opening and closing of the air outlet by the rotation of the baffle.

[0092] In a specific embodiment, the baffle is made of a light and durable material, and the surface is dust-proofed. 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 the heat exchange efficiency.

[0095] An air inlet 11 is provided at the rear side of the cabinet 10 for introducing air. The first heat exchange section 21 is provided on the air flow channel between the air inlet 11 and the centrifugal fan 30, that is, the air flow entering from the air inlet 11 first passes through the first heat exchange section 21 for heat exchange, and then enters 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, the airflow exchanges heat with the second heat exchange section 22.

[0098] This arrangement enables sufficient heat exchange to be performed 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 in 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 first air duct 50 and the second air duct 60 are respectively provided with upper air outlets at the top and lower air outlets at the bottom; 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 flow circulation effect and air flow distribution. The centrifugal fan 30 has the characteristics of high wind pressure and long air supply 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 to a long distance, and this mutual cooperation improves the air supply effect.

[0106] Taking the lower air outlet as an example, the adjacent arrangement here means that the lower air outlet 54 of the first air duct and the lower air 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 the air supply distance here mainly lies in that the airflow blown by the centrifugal fan 30 can drive the airflow blown by the axial flow fan 40 to flow to a long distance.

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

[0108] In summary, in this embodiment, by respectively arranging the centrifugal fan 30 and the axial flow fan 40 on the upper and lower sides of the heat exchanger 20, 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 the upper and lower air outlets are adjacently arranged.

[0111] The high-pressure airflow blown by the centrifugal fan 30 can drive the spiral airflow generated by the axial flow fan 40, forming a synergistic effect of "1+1>2". The adjacent arrangement of the upper and lower air outlets further enhances the interaction between the two airflows and improves the air supply effect.

[0112] In addition, the lower air duct 52 of the first air 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 a main fan blade 41 and a guide auxiliary fan blade 42 cooperate with each other. Through the pre-rotation effect of the guide auxiliary fan blade 42, the airflow impacts the trailing edge of the main fan blade 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 air conditioner cabinet unit 82, an embodiment of the present invention further provides an air conditioner 80. The air conditioner 80 includes: an air conditioner outdoor unit 81 and an air conditioner cabinet unit 82 as in any of the above embodiments, and also includes: a refrigerant pipeline; the refrigerant pipeline includes a liquid pipe 83 and a gas pipe 84 connecting the air conditioner outdoor unit 81 and the air conditioner cabinet unit 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] The liquid pipe 83 and the gas pipe 84 are connected to the outdoor heat exchanger of the air conditioner outdoor unit 81 and the heat exchanger of the air conditioner indoor unit 82, respectively, to form a refrigerant circulation loop. The liquid pipe 83 and the gas pipe 84 are both provided with quick connectors (not shown in the drawings), which include valve cores and sealing rings (not shown in the drawings), which are helpful for quick connection of pipelines during installation and maintenance.

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

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

[0120] In this embodiment, the coordinated operation of the centrifugal fan 30 and the axial flow 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 Fig. 9 As shown, corresponding to the above air conditioner 80, the embodiment of the present invention further provides a control method for an air conditioner, and the control method 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 shielding assembly 71 at the top end of the centrifugal fan 30 to open, and controlling the second wind shielding assembly 72 at the bottom end of the centrifugal fan 30 to close;

[0124] S110, controlling the first part of the 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 port 53 of the first air duct;

[0125] S120, controlling the second part of the air flow to enter from the lower air port 62 of the second air duct, and then being accelerated by the axial flow fan 40 and heat exchanged by the second heat exchange section 22, and then being 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 part of the 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, then enter the lower air duct 52 of the first air duct 50, and be discharged from the lower air 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 adopts different control strategies for the cooling mode and the heating mode to achieve the best air supply effect. Specifically, when the air conditioner 80 works in the cooling mode, the first wind shielding component 71 at the top of the centrifugal fan 30 is first controlled to be in an open state, and the second wind shielding component 72 at the bottom of the centrifugal fan 30 is controlled to be in a closed state. This control combination of wind shielding components ensures that the airflow can be sent upward during cooling, achieving a shower-like cooling effect.

[0131] The first part of the airflow enters 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 makes full use of 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, the second part of the airflow is controlled to enter from the lower air port 62 of the second air duct. This part of the airflow is first accelerated by the axial flow fan 40 to increase the airflow speed. The accelerated airflow flows through the second heat exchange section 22 for heat exchange, and the temperature is reduced after the heat exchange, and finally discharged from the upper air port 61 of the second air duct. This arrangement takes advantage of the large flow rate of the axial flow fan 40, and can form a good cooling effect in a local area. The synergistic effect of the two airflows can effectively improve the indoor temperature distribution.

[0133] When the air conditioner 80 is operated 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. Such a control method ensures that the warm air flow can be transported downward.

[0134] In this mode, the first part of the airflow is controlled to enter from the rear side of the cabinet 10. The airflow first passes through the first heat exchange section 21 for heat exchange, and the temperature rises after the heat exchange, and then is accelerated by the centrifugal fan 30. Different from the cooling mode, this part of the accelerated airflow is guided into the lower air duct 52 (S-shaped air duct) of the first air duct 50, and finally discharged from the lower air port 54 of the first air duct. This design fully considers the flow characteristics of hot air.

[0135] At the same time, the second part of the airflow is controlled to enter from the upper air port 61 of the second air duct. The airflow first passes through the second heat exchange section 22 for heat exchange, and the temperature rises after the heat exchange, and then is accelerated by the axial flow fan 40, and finally discharged from the lower air port 62 of the second air duct. This organization method can form a bottom-up hot air flow circulation and improve 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 the traditional air conditioner 80, significantly improving the overall performance of the air conditioner 80 and user comfort.

[0137] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope 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; the cabinet body is also provided with a first air duct and a second air duct; the first air duct is connected to the centrifugal fan, and the second air duct is connected to the axial flow fan.

2. The air conditioner in-cabinet unit according to claim 1, characterized in that: The first air duct includes an upper air duct and a lower air duct; the upper air duct and the lower air duct are interconnected, 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.

3. The air conditioner in-cabinet unit according to claim 2, characterized in that: The center line of the S-shaped air duct satisfies the curve equation: y=y0+B1*x+B2*x 2 +B3*x 3 , wherein the intersection of the center lines of the upper duct and the lower duct is taken as 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.

4. The air conditioner in-cabinet unit according to claim 3, characterized in that: 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 .

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

6. The air conditioner in-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 shielding component and a second wind shielding component.

7. The air conditioner in-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 arranged on the rear side of the cabinet, and the first heat exchange section is arranged on the air flow channel between the air inlet and the centrifugal fan; the second heat exchange section is arranged above the axial flow fan.

8. The air conditioner in-cabinet unit according to claim 1, characterized in that: The first air duct and the second air duct are respectively provided with upper air outlets at the top and lower air outlets at the bottom; the upper air outlet of the first air duct is adjacent to the upper air outlet of the second air duct, and the lower air outlet of the first air duct is adjacent to the lower air outlet of the second air duct.

9. 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 8, 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.

10. A control method for an air conditioner, characterized in that: Applicable to the air conditioner as claimed in claim 9, comprising the following steps: In cooling mode: Controlling a first wind shield component at the top of the centrifugal fan to open, and controlling a second wind shield component at the bottom of the centrifugal fan to close; Controlling the first part of the 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, and then being discharged from the upper air outlet of the first air duct; Controlling the second part of the air flow to enter from the lower air port of the second air duct, and then passing through the axial flow fan to accelerate and the second heat exchange section to perform heat exchange, and then being discharged from the upper air port of the second air duct; In heating mode: Controlling the first wind shield component to close, and controlling the second wind shield component to open; Controlling the first part of the airflow to enter from the rear side of the cabinet, sequentially passing through the first heat exchange section for heat exchange, accelerating the centrifugal fan, entering the lower air duct of the first air duct, and being discharged from the lower air 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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