Air conditioner indoor unit and air conditioner

Abstract

The utility model discloses an air conditioner indoor unit and an air conditioner, and relates to the technical field of air conditioners, the air conditioner indoor unit comprises a cross-flow fan, and an impeller of the cross-flow fan is provided with a plurality of blades; the multiple blades are arranged in the circumferential direction of the impeller, each blade comprises a blade inner edge, and the blade inner edges are of an arc structure and stretch out towards the circle center of the impeller. Moreover, the inner edges of every two adjacent blades are tangent to the circle center of the impeller so as to form tangent lines, a distribution angle is formed between every two adjacent tangent lines, the multiple blades are unevenly distributed in the circumferential direction of the impeller, the multiple distribution angles have the overall standard deviation K, and K is larger than 0 and smaller than 1. According to the air conditioner indoor unit and the air conditioner, the distribution angles are set to be unequal angles, the distribution angles are arranged based on the overall standard deviation K, the distribution angles of the cross-flow fan fluctuate within the set range, the decomposition force generated by aerodynamic force of the blades can approach to zero, and low-frequency sudden sound caused by periodic fluctuation of the aerodynamic force is weakened.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an indoor unit of an air conditioner and an air conditioner. Background Art

[0002] Air conditioning refers to equipment that artificially regulates and controls the temperature, humidity, flow rate, and other parameters of the ambient air within a building or structure. Air conditioners typically have indoor and outdoor units, with some indoor units using cross-flow fans for air supply and heat exchange.

[0003] The rotation of the cross-flow fan drives indoor air into the air conditioner's indoor unit, allowing the indoor air to exchange heat with the indoor heat exchanger. Therefore, the faster the cross-flow fan speed, the greater the airflow driven by the cross-flow fan, and the more effective the heat exchange between the indoor air and the indoor heat exchanger. However, as the cross-flow fan speed increases, the noise generated by the operation of the cross-flow fan also increases.

[0004] At present, the blade distribution of a cross-flow fan can be random and uneven, that is, the intervals between adjacent blades are not equal. In order to ensure that the blades meet the requirements of dynamic balance when they are unevenly distributed, the centers of all blades of the cross-flow fan should fall on the center of the cross-flow fan circle, and the resultant force of all blades in the circumferential direction of the cross-flow fan should be zero. However, when the unevenly distributed blades are doing work, they will be affected by the airflow, generating uneven aerodynamic forces. These aerodynamic forces will cause the fan body to vibrate and be transmitted to the fan motor, the connection between the fan and the bearing seat, causing abnormal thumping sound. This thumping sound is strongly heard directly below the indoor unit of the air conditioner. Moreover, as the speed of the cross-flow fan increases, the volume of the thumping sound increases. Utility Model Content

[0005] The purpose of the utility model is to provide an air conditioner indoor unit and an air conditioner, which can effectively reduce the fan vibration caused by the aerodynamic force generated by the blades when the blades of the cross-flow fan are unevenly distributed, and improve the rattling sound generated by the high-speed operation of the cross-flow fan, so as to solve the problem that the existing air conditioner is prone to produce obvious rattling sound when the cross-flow fan runs at high speed.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An air conditioner indoor unit, comprising:

[0008] case;

[0009] A cross-flow fan is disposed in the housing and is configured to rotate to introduce air into the housing and output the air introduced into the housing to the room; wherein the cross-flow fan includes at least:

[0010] An impeller, wherein the outer contour of the impeller is a cylinder, and the impeller has a plurality of blades; the plurality of blades are sequentially arranged in the circumferential direction of the impeller, and the plurality of blades extend along the axial direction of the impeller, wherein the blades include:

[0011] The inner edge of the blade is an arc structure and extends toward the center of the impeller; and

[0012] The inner edges of two adjacent blades are tangent to the center of the impeller to form a tangent line, and a distribution angle is formed between the two adjacent tangent lines, and,

[0013] The plurality of blades are unevenly distributed in the circumferential direction of the impeller, and the plurality of distribution angles have an overall standard deviation K, 0<K<1.

[0014] In some embodiments, the population standard deviation K satisfies 0.3≤K≤0.8.

[0015] In some embodiments, within the same impeller, the maximum value of the distribution angle is A max , the minimum value of the distribution angle is A min , and the maximum value of the distribution angle A max With the minimum value of the distribution angle A min Satisfy 0°<A max -A min ≤3°.

[0016] In some embodiments, the number of blades in the same impeller is 25-42, and the center of mass of the impeller is located on the central axis of the impeller.

[0017] In some embodiments, there are multiple impellers, and the centers of mass of the multiple impellers are all located on the central axis of the impeller.

[0018] In some embodiments, the outer profile of the blade is wing-shaped, and the blade further comprises:

[0019] a suction surface, the suction surface being a convex surface of the blade and capable of withstanding the suction force generated by the airflow when the blade rotates;

[0020] a pressure surface, the pressure surface being a concave surface of the blade and capable of withstanding the pressure generated by the flow of air when the blade rotates; and

[0021] The outer edge of the blade is an arc structure and extends toward the outside of the impeller; and the outer edge of the blade includes:

[0022] The anti-pressure section is connected to the suction surface, is a plane, and is arranged toward the outer peripheral side of the impeller.

[0023] In some embodiments, the blade outer edge further comprises:

[0024] A transition section is an arc section, and the transition section is connected between the pressure surface and the anti-pressure section, and is smoothly connected to the anti-pressure section and the pressure surface.

[0025] In some embodiments, in the cross section of the impeller, the length of the pressure-resistant section is L, the arc radius of the transition section is R, and the length L of the pressure-resistant section is greater than the arc radius R of the transition section.

[0026] In some embodiments, the arc radius R of the transition section is in the range of 0.1 mm to 1 mm.

[0027] In some embodiments, based on the aforementioned air conditioner indoor unit, the present application proposes an air conditioner, comprising:

[0028] The air conditioner indoor unit as described above; and

[0029] Air conditioner outdoor unit;

[0030] The outdoor unit of the air conditioner has an outdoor heat exchanger, and the indoor unit of the air conditioner has an indoor heat exchanger. The outdoor heat exchanger and the indoor heat exchanger are connected to each other to realize a heat exchange cycle.

[0031] Compared with the prior art, the indoor unit of the air conditioner and the air conditioner implemented by the utility model have the following beneficial effects:

[0032] The air conditioner indoor unit and air conditioner of the present application set the distribution angle to an uneven angle, so that the distribution angle is unequally distributed in the circumferential direction of the impeller, and the distribution angle is arranged based on the overall standard deviation K. Based on the distribution angle size limited by 0<K<1, multiple blades are unevenly arranged at corresponding distribution angles on the circumferential side of the impeller. In this way, the distribution angle of the cross-flow fan based on the present application fluctuates within a set range, and the aerodynamic force generated by each blade due to the rotation work can fluctuate within a suitable range, so that when the cross-section of the cross-flow fan is subjected to an orthogonal decomposition method, the decomposed force generated by the aerodynamic force of all blades in the X-axis and Y-axis directions can approach zero, thereby reducing the final impact of the aerodynamic force, and further reducing the vibration amplitude generated by the aerodynamic force, so that the low-frequency thumping sound caused by the periodic fluctuation of the aerodynamic force is weakened.

[0033] Moreover, the indoor unit of the air conditioner and the air conditioner of the present application have a planar structure with a pressure-resistant section on the outer edge of the blade, so that when the blades of the cross-flow fan are subjected to the circumferential force of the impeller, the area of ​​the outer edge of the blade that is subjected to the force is increased, thereby reducing the force on the blade, avoiding damage to the outer edge of the blade, and ensuring that the force on the blade can be maintained unchanged, avoiding changes in aerodynamic force caused by blade rotation due to blade damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of an air conditioner in an embodiment of the present application;

[0035] Figure 2 is a schematic diagram of an indoor unit of an air conditioner in an embodiment of the present application;

[0036] Figure 3 yes Figure 2 The internal structure diagram of the indoor unit of the air conditioner is shown;

[0037] Figure 4 yes Figure 2 A schematic diagram of the internal structure of the air conditioner indoor unit from another angle is shown;

[0038] Figure 5 This is a partial structural diagram of a cross-flow fan in an embodiment of the present application;

[0039] Figure 6 yes Figure 5 A magnified view of middle A;

[0040] Figure 7 Schematic diagram of the distribution angle in the embodiment of the present application;

[0041] Figure 8 is a schematic diagram of a blade in an embodiment of the present application;

[0042] Figure 9 is a schematic diagram of another example blade in an embodiment of the present application;

[0043] Figure 10 yes Figure 9 Magnified view of B.

[0044] In the figure, 100, air conditioner; 110, air conditioner indoor unit; 120, air conditioner outdoor unit;

[0045] 1. Casing; 2. Air inlet; 3. Air outlet; 4. Air inlet grille; 5. Air guide plate; 6. Crossflow fan; 6a. Impeller; 6b. Left side panel; 6c. Right side panel; 6d. Blade; 60d. Suction surface; 61d. Pressure surface; 62d. Blade inner edge; 63d. Blade outer edge; 630d. Pressure-resistant section; 631d. Transition section; 6f. Middle plate; 6g. Through hole; 7. Indoor heat exchanger. DETAILED DESCRIPTION

[0046] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0047] In the description of this application, it should be understood that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, it may be internal communication between two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0048] In the description of this application, it should be understood that the terms "height", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. used in this application to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0049] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0050] In this application, an air conditioner performs a cooling cycle or heating cycle through a compressor, condenser, expansion valve, and evaporator. The cooling cycle and heating cycle involve a series of processes, including compression, condensation, expansion, and evaporation. The refrigerant absorbs or releases heat to provide cooling or heating to the indoor space, regulating the indoor temperature.

[0051] The compressor compresses high-temperature, high-pressure refrigerant gas and discharges the compressed gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0052] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser to a lower-pressure liquid. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves cooling by utilizing the latent heat of evaporation to exchange heat with the material being cooled. Throughout this cycle, the air conditioner regulates the temperature of the indoor space.

[0053] The air conditioner of the present application includes an air conditioner indoor unit 110 and an air conditioner outdoor unit 120, the air conditioner outdoor unit 120 refers to the part of the refrigeration cycle including a compressor and an outdoor heat exchanger, the air conditioner indoor unit 110 includes an indoor heat exchanger, and the expansion valve can be provided in the indoor unit or the outdoor unit.

[0054] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0055] Reference below Figures 1-10 The air conditioner indoor unit 110 and the air conditioner 100 according to an embodiment of the present application are described. The air conditioner indoor unit 110 of this embodiment includes a housing 1, with an air inlet 2 disposed at the top and an air outlet 3 disposed at the bottom. An air inlet grille 4 is disposed at the air inlet 2 to filter the air introduced into the housing 1, and an air guide plate 5 is disposed at the air outlet 3 to guide the airflow into the room.

[0056] Inside the housing 1 are disposed a crossflow fan 6 and an indoor heat exchanger 7. The indoor heat exchanger 7 is disposed around the periphery of the crossflow fan 6 and between the air inlet 2 and the crossflow fan 6. The crossflow fan 6 is capable of rotating relative to the housing 1, thereby drawing air into the housing 1 from the air inlet 2, exchanging heat with the indoor heat exchanger 7, and then returning air to the room through the air outlet 3. The structure of the indoor heat exchanger 7 of the present application can be adapted from that of the indoor heat exchanger 7 of a wall-mounted air conditioner indoor unit 110, and will not be further described here.

[0057] refer to Figure 5-6The cross-flow fan 6 includes an impeller 6a and a drive motor (not shown). There are multiple impellers 6a, which are connected in sequence along their own axial direction. It is understood that the impellers 6a of the cross-flow fan 6 are generally cylindrical in structure, so the aforementioned axial direction is both the central axis direction of the output shaft of the drive motor and the central axis direction of the impeller 6a. Furthermore, in the aforementioned axial direction, two adjacent impellers 6a are connected by a center plate 6f. The center plate 6f has a through hole 6g disposed therein, which axially extends through the center plate 6f. The two impellers 6a at the outermost edges each have a side plate covering the ends of the impellers 6a. For example, the impeller 6a at the far left has a left side plate 6b covering its left side, and the impeller 6a at the far right has a right side plate 6c covering its right side. In addition, the left side plate 6b of the leftmost impeller 6a is connected to a bearing seat (not shown in the figure), and the right side plate 6c of the rightmost impeller 6a is connected to a drive motor, so that the drive motor can output power and drive the impeller 6a to rotate coaxially with the output shaft. Of course, in other embodiments, the drive motor and the bearing seat can also be installed in reverse, that is, the right side plate 6c of the rightmost impeller 6a is connected to a bearing seat (not shown in the figure), and the left side plate 6b of the leftmost impeller 6a is connected to the drive motor, so that the drive motor can output power and drive the impeller 6a to rotate coaxially with the output shaft.

[0058] refer to Figure 5-8 The same impeller 6a has multiple blades 6d, and the multiple blades 6d are arranged in sequence in the circumferential direction of the impeller 6a, and the multiple blades 6d extend along the axial direction of the output shaft. In the cross section of the impeller 6a, the blades 6d have an airfoil structure. Specifically, the blades 6d include a suction surface 60d, a pressure surface 61d, and a blade inner edge 62d and a blade outer edge 63d connected between the suction surface 60d and the pressure surface 61d. Among them, the suction surface 60d is Figure 8 The right end surface in the direction shown is the convex surface of the blade 6d. The suction surface 60d can withstand the suction generated by the air flow when the blade 6d rotates; the pressure surface 61d is Figure 8 The left end surface in the direction shown is the concave surface of the blade 6d, and the pressure surface 61d can withstand the pressure generated by the airflow when the blade 6d rotates.

[0059] It is understood that, depending on the direction of the airflow introduced by the impeller 6a, the pressure surface 61d and the suction surface 60d may be arranged in other ways. For example, in other blades 6d, the suction surface 60d may be arranged on the left end surface of the blade 6d, and the pressure surface 61d may be arranged on the right end surface of the blade 6d. The concave and convex design of the pressure surface 61d and the suction surface 60d relative to the blade 6d body may also be adjusted based on the configuration parameters of the impeller 6a, which is not illustrated separately here.

[0060] The inner edge 62d and the outer edge 63d of the blade are both arc-shaped, and the inner edge 62d of the blade extends toward the center of the impeller 6a, while the outer edge 63d extends toward the outer periphery of the blade 6d. Specifically, the inner edge 62d of the blade 6d of this embodiment can be tangent to the center of the impeller 6a and form a tangent line. In this way, when the inner edges 62d of two adjacent blades 6d are tangent to the center of the impeller 6a, two adjacent tangent lines are formed, namely Figure 7 The tangent line OA and the tangent line OC shown in the figure form a distribution angle ∠AOC between the tangent line OA and the tangent line OC.

[0061] It is understood that the distribution angle reflects the circumferential layout of the blades 6d on the impeller 6a. There is a distribution angle between each two adjacent blades 6d. Thus, when the impeller 6a has n blades 6d, the impeller 6a will simultaneously form n distribution angles.

[0062] In this embodiment, the distribution angles of the same impeller 6a are arranged unequally around the circumference of the impeller 6a. This means that the distribution angles are not necessarily equal. For example, if 36 blades 6d are provided within the same impeller 6a, the distribution angles may be 9.15°, 9.5°, 10°, 11.3°, and so on. Furthermore, the distribution angles may be partially, but not entirely, identical, causing the distribution angles to fluctuate within a certain range of values. Therefore, the distribution angles of the same impeller 6a have an overall standard deviation K. This overall standard deviation K reflects the dispersion of any distribution angle within the same impeller 6a compared to the average angle of all distribution angles, i.e., the fluctuation in the distribution angles, or the degree of fluctuation.

[0063] It is understandable that when the distribution angle is uneven, the blades 6d will be unevenly distributed around the impeller 6a, that is, the spacing between two adjacent blades 6d will be different. Since the blades 6d are unevenly distributed around the impeller 6a, the mass distribution of the cross-flow fan 6 will be uneven. When the impeller 6a is driven by the drive motor to rotate, in order to achieve dynamic balance of the impeller 6a, the centers of the blades 6d of the same impeller 6a need to fall on the rotation axis of the impeller 6a. Therefore, Figure 7 As shown, when an orthogonal coordinate system is established with the cross section of the impeller 6a, the decomposition forces of the gravity of the blade 6d of the same impeller 6a in the X-axis and Y-axis directions should be zero respectively, that is, the decomposition force in the X-axis direction satisfies The decomposition force in the Y-axis direction satisfies Here, i=1, 2, 3, 4, 5, 6, ... n, and n is the number of blades 6d in the same impeller 6a.

[0064] Moreover, when the impeller 6a is driven to rotate by the drive motor, in addition to the gravity of the blades 6d themselves, the aerodynamic force generated by the airflow driven by the blades 6d during rotation will also cause a certain disturbance to the blades 6d. The magnitude of the aerodynamic force generated by the blades 6d is related to the rotation speed of the impeller 6a and the distribution angle of the blades 6d. When the distribution angle of the blades 6d fluctuates slightly, the aerodynamic disturbance is relatively weak. Therefore, the overall standard deviation K of the blades 6d of the impeller 6a of this embodiment satisfies: 0<K<1, preferably 0.3≤K≤0.8. When the plurality of blades 6d are unevenly distributed around the circumference of the impeller 6a based on the overall standard deviation K, the center of gravity of the blades 6d can fall on the rotation axis of the impeller 6a. In addition, the noise generated by the rotation of the blades 6d and the low-frequency creaking sound of the cross-flow fan 6 can be reduced to meet the user's auditory needs, as shown in Table 1 below.

[0065] Table 1

[0066]

[0067]

[0068] As can be seen from Table 1, when the K value of the distribution angle of blades 6d is in the range of 0 to 1, the low-frequency chugging sound of cross-flow fan 6 can be maintained at a score of 6 or above, indicating that the low-frequency chugging sound of cross-flow fan 6 is not obvious and has little impact on the user's hearing. When the K value of the distribution angle of blades 6d is in the range of 0.3-0.8, the total score of both the noise generated by the rotation of blades 6d and the low-frequency chugging sound of cross-flow fan 6 is above 15 points, and the scores of each item can be maintained above 6. When the K value of the distribution angle of blades 6d is in other numerical ranges, the total evaluation of the noise generated by the rotation of blades 6d and the low-frequency chugging sound of cross-flow fan 6 is only below 12 points, which is significantly different from the aforementioned numerical ranges.

[0069] It can be understood that when the blades 6d of this embodiment are distributed in an uneven manner around the impeller 6a, the distribution angle formed by two adjacent blades 6d has a maximum value A. max With the minimum value A min Considering the setting range of the aforementioned K value, the maximum value A of the distribution angle of the blade 6d in this embodiment is max and the minimum value of the distribution angle A min Can meet 0°<A max -A min≤3°. Furthermore, the number of blades 6d within the same impeller 6a can range from 25 to 42. This ensures that the distribution angle fluctuation of the blades 6d within the same impeller 6a, i.e., the overall standard deviation K of the distribution angle, is within the range of 0.3-0.8. Of course, when configuring the distribution angle of the blades 6d, it is also necessary to ensure that the center of mass of the impeller 6a is located on the central axis of the output shaft. Furthermore, when the cross-flow fan 6 comprises multiple impellers 6a spliced ​​in sequence, the centers of mass of the multiple impellers 6a must also be located on the central axis of the output shaft.

[0070] It is understandable that the shape integrity of blade 6d affects the center of mass of blade 6d and the aerodynamic force generated during the rotation of blade 6d. After configuring a corresponding distribution angle for blade 6d and arranging multiple blades 6d at the configured distribution angle in the circumference of impeller 6a, maintaining the integrity of the shape of blade 6d is helpful in maintaining the volume generated by the rotation of cross-flow fan 6. Therefore, as another example of this embodiment, the outer contour of blade 6d can adopt a wing-shaped structure, and the outer edge 63d of the blade is an arc structure and extends toward the outside of the impeller 6a; and the outer edge 63d of the blade includes a pressure-resistant section 630d, which is connected to the suction surface 60d, and the pressure-resistant section 630d is a plane and is arranged toward the outer circumference of impeller 6a.

[0071] refer to Figure 9-10 After the pressure-resistant section 630d is arranged toward the outer peripheral side of the impeller 6a, when the blade 6d is subjected to external force or the blade 6d is subjected to airflow pressure, the pressure-resistant section 630d can serve as a force-bearing surface as a whole to withstand the external force or airflow pressure, so that the pressure of the external force or airflow pressure acting on the blade 6d is reduced, thereby increasing the degree to which the blade 6d can withstand the external force or airflow pressure, so as to ensure the stability of the blade 6d structure.

[0072] refer to Figure 9-10 In some embodiments, the blade outer edge 63d further includes a transition section 631d. This transition section 631d is a circular arc segment and connects between the pressure surface 61d and the pressure-resistant section 630d. The transition section 631d smoothly connects the pressure-resistant section 630d and the pressure surface 61d. This smooth connection allows airflow to pass more smoothly over the pressure surface 61d, mitigating the impact of the pressure-resistant section 630d on the airflow.

[0073] It is understood that the compressive strength of blade 6d is related to the length of compressive section 630d. To ensure that blade 6d effectively improves its compressive strength, in some embodiments, in the cross-section of impeller 6a, the length of compressive section 630d is L, the arc radius of transition section 631d is R, and the length L of compressive section 630d is greater than the arc radius R of transition section 631d. This ensures that the compressive section 630d has a certain length at the outer edge 63d of the blade, thereby ensuring that the plane formed by the compressive section 630d has a certain area to distribute the forces acting on the edge of blade 6d. Furthermore, to ensure the machining accuracy of blade outer edge 63d, in some embodiments, the arc radius R of transition section 631d can be selected within the range of 0.1 mm to 1 mm.

[0074] Based on the aforementioned air conditioner indoor unit 110, some embodiments of the present application also provide an air conditioner 100, which includes the aforementioned air conditioner indoor unit 110 and an air conditioner outdoor unit 120, wherein the air conditioner outdoor unit 120 has an outdoor heat exchanger (not shown in the figure), and the air conditioner indoor unit 110 has an indoor heat exchanger 7, and the outdoor heat exchanger and the indoor heat exchanger 7 are interconnected to realize a heat exchange cycle.

[0075] Since the air conditioner 100 has the structure of the aforementioned air conditioner indoor unit 110 , the blades 6 d of the cross-flow fan 6 of the air conditioner 100 can also adopt a layout structure in which the blades 6 d are arranged according to the overall standard deviation K and have the advantages of the aforementioned air conditioner indoor unit 110 .

[0076] In summary, the air conditioner indoor unit 110 and the air conditioner 100 provided in the embodiment of the present application set the distribution angle to an uneven angle and arrange the distribution angle based on the overall standard deviation K. Based on the distribution angle size defined by 0<K<1, the plurality of blades 6d are unevenly arranged at the corresponding distribution angle on the circumference of the impeller 6a. In this way, the distribution angle of the cross-flow fan 6 based on the present application fluctuates within the set range, and the aerodynamic force generated by each blade 6d due to the rotation work can fluctuate within a suitable range, so that when the cross-section of the cross-flow fan 6 is subjected to the orthogonal decomposition method, the decomposed force generated by the aerodynamic force of all blades 6d in the X-axis and Y-axis directions can approach zero, thereby reducing the final impact of the aerodynamic force, and further reducing the vibration amplitude generated by the aerodynamic force, so that the low-frequency thumping sound caused by the periodic fluctuation of the aerodynamic force is weakened.

[0077] Moreover, the air conditioner indoor unit 110 and the air conditioner 100 of the present application have a planar structure of a pressure-resistant section 630d set on the outer edge 63d of the blade, so that when the blade 6d of the cross-flow fan 6 is subjected to the circumferential force of the impeller 6a, the area of ​​the outer edge 63d of the blade subjected to the force is increased, thereby reducing the force intensity of the blade 6d, avoiding damage to the outer edge 63d of the blade 6d, and ensuring that the force applied to the blade 6d can be maintained unchanged, avoiding changes in aerodynamic force caused by the rotation of the blade 6d due to damage to the blade 6d.

[0078] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present application. These improvements and replacements should also be regarded as the scope of protection of the present application.

Claims

1. An air conditioner indoor unit, characterized in that: include: case; A cross-flow fan, wherein the cross-flow fan is arranged in the housing, and the cross-flow fan is configured to be rotatable to introduce air into the housing and output the air introduced into the housing to the room; wherein the cross-flow fan at least comprises: An impeller, wherein the outer contour of the impeller is a cylinder, and the impeller has a plurality of blades; the plurality of blades are sequentially arranged in the circumferential direction of the impeller, and the blades extend along the axial direction of the impeller, wherein the blades include: The inner edge of the blade is an arc structure and extends toward the center of the impeller; and The inner edges of two adjacent blades are tangent to the center of the impeller to form a tangent line, and a distribution angle is formed between the two adjacent tangent lines, and, The plurality of blades are unevenly distributed in the circumferential direction of the impeller, and the plurality of distribution angles have an overall standard deviation K, 0<K<1.

2. The air conditioner indoor unit according to claim 1, characterized in that: The population standard deviation K satisfies 0.3≤K≤0.

8.

3. The indoor unit of the air conditioner according to claim 1, characterized in that: In the same impeller, the maximum value of the distribution angle is A max , the minimum value of the distribution angle is A min , and the maximum value of the distribution angle A max With the minimum value of the distribution angle A min Satisfy 0°<A max -A min ≤3°.

4. The air conditioner indoor unit according to claim 2 or 3, characterized in that: The number of blades in the same impeller is 25-42, and the center of mass of the impeller is located on the central axis of the impeller.

5. The air conditioner indoor unit according to claim 4, characterized in that: There are multiple impellers, and the multiple impellers are connected in sequence along their own axial direction, and the center of mass of the multiple impellers is located on the central axis of the impeller.

6. The air conditioner indoor unit according to claim 1, characterized in that: The outer contour of the blade is wing-shaped, and the blade further comprises: A suction surface, which is a convex surface of the blade and is capable of withstanding the suction force generated by the flow of air when the blade rotates; a pressure surface, the pressure surface being a concave surface of the blade and being capable of withstanding the pressure generated by the flow of air when the blade rotates; and The outer edge of the blade is an arc structure and extends toward the outside of the impeller; and the outer edge of the blade includes: The anti-pressure section is connected to the suction surface, and the anti-pressure section is a plane and is arranged toward the outer peripheral side of the impeller.

7. The air conditioner indoor unit according to claim 6, characterized in that: The blade outer edge also includes: A transition section is an arc section, and the transition section is connected between the pressure surface and the anti-pressure section, and is smoothly connected to the anti-pressure section and the pressure surface.

8. The air conditioner indoor unit according to claim 7, characterized in that: At In the cross section of the impeller, the length of the pressure-resistant section is L, the arc radius of the transition section is R, and the length L of the pressure-resistant section is greater than the arc radius R of the transition section.

9. The indoor unit of the air conditioner according to claim 7, characterized in that: The arc radius R of the transition section is in the range of 0.1 mm-1 mm.

10. An air conditioner, characterized in that: include: The air conditioner indoor unit according to any one of claims 1 to 9; as well as, Air conditioner outdoor unit; Wherein, the outdoor unit of the air conditioner has an outdoor heat exchanger, and the indoor unit of the air conditioner has an indoor heat exchanger. The outdoor heat exchanger and the indoor heat exchanger are connected to each other to realize a heat exchange cycle.

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