Axial flow fan and air conditioner

Abstract

The invention discloses an axial flow fan and an air conditioner, and relates to the technical field of air conditioners. The axial fan comprises a core shaft and fan blades. The fan blades are in a belt shape and extend in a convolution shape, each fan blade comprises a first blade section and a second blade section which are integrally formed, the first blade sections and the second blade sections are sequentially arranged in the air outlet direction, the first blade sections are provided with first blade roots, the second blade sections are provided with second blade roots, and the first blade roots and the second blade roots are arranged at intervals and both connected to the circumferential face of the core shaft. An air inlet tail edge is arranged at the end, close to the second blade root, of the first blade root, an air outlet front edge is arranged at the end, close to the first blade root, of the second blade root, and the air inlet tail edge and the air outlet front edge are staggered in the circumferential direction of the mandrel. According to the axial flow fan, the capacity of converting mechanical energy into wind energy can be improved, the fan blade efficiency is improved, energy consumption is reduced, the operation cost is reduced, the air outlet amount is increased, and the heat dissipation effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an axial flow fan and an air conditioner. Background Art

[0002] At present, with the increasing living standards, air conditioners have become an indispensable household appliance in thousands of households. An air conditioner includes an indoor unit and an outdoor unit. Among them, the indoor unit is installed indoors, and the outdoor unit is installed outdoors. The indoor unit and the outdoor unit work together to achieve the function of regulating the indoor temperature. The outdoor unit is generally cooled by an axial flow fan. However, due to the limitation of the shape and structure of the current axial flow fan, its ability to convert mechanical energy into wind energy during rotation is poor, that is, the blade efficiency is low, the energy consumption is high, resulting in energy waste, increased operating costs, and a small air volume and poor heat dissipation effect. Summary of the Invention

[0003] The problem solved by the present invention is how to improve the ability to convert mechanical energy into wind energy, improve the blade efficiency, reduce energy consumption, reduce operating costs, and increase the air volume and improve the heat dissipation effect.

[0004] To solve the above problems, the technical solution of the present invention is realized as follows:

[0005] In a first aspect, the present invention provides an axial flow fan, including a core shaft and fan blades. The fan blades are strip-shaped and extend in a swirling shape. The fan blades include an integrally formed first blade segment and a second blade segment. The first blade segment and the second blade segment are arranged in sequence along the air outlet direction. The first blade segment is provided with a first blade root, and the second blade segment is provided with a second blade root. The first blade root and the second blade root are arranged at intervals and are both connected to the circumferential surface of the core shaft. An air inlet trailing edge is provided at one end of the first blade root close to the second blade root, and an air outlet leading edge is provided at one end of the second blade root close to the first blade root. The air inlet trailing edge and the air outlet leading edge are arranged out of phase in the circumferential direction of the core shaft. Compared with the prior art, the axial flow fan provided by the present invention can improve the ability to convert mechanical energy into wind energy, improve the blade efficiency, reduce energy consumption, reduce operating costs, and increase the air volume and improve the heat dissipation effect due to the adoption of the first blade segment and the second blade segment arranged in sequence along the air outlet direction and the air inlet trailing edge and the air outlet leading edge arranged out of phase in the circumferential direction of the core shaft.

[0006] Further, the included angle range between the air inlet trailing edge and the air outlet leading edge in the circumferential direction of the core shaft is 15 degrees to 20 degrees. By limiting the included angle between the air inlet trailing edge and the air outlet leading edge in the circumferential direction of the core shaft, the size of the gap between the air inlet trailing edge and the air outlet leading edge in the circumferential direction of the core shaft can be controlled, and the axial air flow can be increased while ensuring the air outlet effect, thereby improving the blade efficiency and increasing the air volume.

[0007] Furthermore, the included angle between the air inlet trailing edge and the air outlet leading edge in the circumferential direction of the core shaft is 17 degrees. A reasonable included angle between the air inlet trailing edge and the air outlet leading edge in the circumferential direction of the core shaft can further increase the air flow rate entering the air guiding cavity axially, thereby increasing the air output of the entire axial flow fan and improving the ability of the axial flow fan to convert mechanical energy into wind energy during rotation, that is, improving the blade efficiency.

[0008] Furthermore, the air inlet leading edge is provided at one end of the first blade root away from the second blade root, and the included angle range between the air inlet leading edge and the air inlet trailing edge in the circumferential direction of the core shaft is 55 degrees to 65 degrees. By limiting the included angle between the air inlet leading edge and the air inlet trailing edge in the circumferential direction of the core shaft, the setting angle of the first blade root in the circumferential direction of the core shaft can be controlled, thereby determining the inclination degree of the first blade root relative to the axial direction of the core shaft, ensuring that the first blade segment can exert sufficient pressure on the air during the rotation of the axial flow fan and enhancing the air outlet effect.

[0009] Furthermore, the included angle between the air inlet leading edge and the air inlet trailing edge in the circumferential direction of the core shaft is 61 degrees. A reasonable included angle between the air inlet leading edge and the air inlet trailing edge in the circumferential direction of the core shaft can further enhance the pressure on the air, improve the air outlet effect and air output, and improve the blade efficiency.

[0010] Furthermore, the first blade root is arranged in an airfoil shape. The first blade root has a first chord line, and the first chord line is connected between the air inlet leading edge and the air inlet trailing edge, and the first chord line is inclined to the axial direction of the core shaft. During the rotation of the axial flow fan, the inclined first blade segment will generate a certain pressure on the air to make the air flow in the air outlet direction, improving the blade efficiency and air output.

[0011] Furthermore, the air outlet trailing edge is provided at one end of the second blade root away from the first blade root, and the included angle range between the air outlet leading edge and the air outlet trailing edge in the circumferential direction of the core shaft is 50 degrees to 60 degrees. By limiting the included angle between the air outlet leading edge and the air outlet trailing edge in the circumferential direction of the core shaft, the setting angle of the second blade root in the circumferential direction of the core shaft can be controlled, thereby determining the inclination degree of the second blade root relative to the axial direction of the core shaft, ensuring that the second blade segment can exert sufficient pressure on the air during the rotation of the axial flow fan and enhancing the air outlet effect.

[0012] Furthermore, the included angle between the air outlet leading edge and the air outlet trailing edge in the circumferential direction of the core shaft is 54 degrees. A reasonable included angle between the air outlet leading edge and the air outlet trailing edge in the circumferential direction of the core shaft can further enhance the pressure on the air, improve the air outlet effect and air output, and improve the blade efficiency.

[0013] Furthermore, the second blade root is arranged in an airfoil shape. The second blade root has a second chord line, and the second chord line is connected between the air outlet leading edge and the air outlet trailing edge, and the second chord line is inclined to the axial direction of the core shaft. The inclined second blade segment will generate a certain pressure on the air to make the air flow in the air outlet direction, further improving the blade efficiency and air output.

[0014] In a second aspect, the present invention provides an air conditioner, including a driving motor and the above-mentioned axial-flow fan. The axial-flow fan includes a core shaft and fan blades. The driving motor is connected to the core shaft. The fan blades are strip-shaped and extend in a swirling shape. The fan blades include integrally formed first blade segments and second blade segments. The first blade segments and the second blade segments are arranged in sequence along the air outlet direction. The first blade segments are provided with first blade roots, and the second blade segments are provided with second blade roots. The first blade roots and the second blade roots are arranged at intervals and are both connected to the circumferential surface of the core shaft. One end of the first blade root close to the second blade root is provided with an air inlet trailing edge, and one end of the second blade root close to the first blade root is provided with an air outlet leading edge. The air inlet trailing edge and the air outlet leading edge are arranged out of alignment in the circumferential direction of the core shaft. The air conditioner can improve the ability to convert mechanical energy into wind energy, improve the efficiency of the fan blades, reduce energy consumption, reduce operating costs, and increase the air volume and improve the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the axial-flow fan according to the first embodiment of the present invention from one perspective;

[0016] Figure 2 is a schematic structural diagram of the axial-flow fan according to the first embodiment of the present invention from another perspective;

[0017] Figure 3 is a mathematical model diagram of the axial-flow fan according to the first embodiment of the present invention from one perspective;

[0018] Figure 4 is a mathematical model diagram of the axial-flow fan according to the first embodiment of the present invention from another perspective.

[0019] DESCRIPTION OF THE REFERENCE NUMERALS:

[0020] 100 - axial-flow fan; 110 - core shaft; 120 - fan blade; 121 - first blade segment; 122 - second blade segment; 123 - first blade root; 1231 - first chord; 124 - second blade root; 1241 - second chord; 125 - air inlet leading edge; 126 - air inlet trailing edge; 127 - air outlet leading edge; 128 - air outlet trailing edge; 130 - air guiding cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is provided in conjunction with the accompanying drawings.

[0022] First Embodiment

[0023] Please refer to Figures 1 to 4 , an embodiment of the present invention provides an axial-flow fan 100 for driving air flow. It can improve the ability to convert mechanical energy into wind energy, improve the efficiency of the fan blades, reduce energy consumption, reduce operating costs, and increase the air volume and improve the heat dissipation effect.

[0024] It should be noted that the axial flow fan 100 is applied to an outdoor unit of an air conditioner (not shown in the figure). The outdoor unit of the air conditioner is installed outdoors and is connected to an indoor unit of the air conditioner (not shown in the figure). The outdoor unit and the indoor unit of the air conditioner work together to achieve the function of regulating the indoor air temperature. The outdoor unit of the air conditioner includes a condenser (not shown in the figure), a drive motor (not shown in the figure), and a housing (not shown in the figure). Among them, the condenser, the drive motor, and the axial flow fan 100 are all arranged inside the housing, and the housing is used to shield and protect the condenser, the drive motor, and the axial flow fan 100. The drive motor is connected to the axial flow fan 100 to drive the axial flow fan 100 to rotate. The position of the axial flow fan 100 corresponds to the position of the condenser, and the condenser is used to exchange heat for the refrigerant. The axial flow fan 100 can form a negative pressure during rotation to drive the air flow to form an air outlet flow, and this air outlet flow is used to air-cool the condenser to take away the heat of the condenser and ensure the normal operation of the condenser.

[0025] The axial flow fan 100 includes a core shaft 110 and fan blades 120. The core shaft 110 is cylindrical, and the fan blades 120 are fixedly connected to the circumferential surface of the core shaft 110. The core shaft 110 is used to drive the fan blades 120 to rotate, and the fan blades 120 can generate a negative pressure during rotation to drive the air flow. Specifically, the core shaft 110 is used to be connected to the drive motor, and the drive motor can drive the fan blades 120 to rotate through the core shaft 110.

[0026] It is worth noting that the fan blades 120 are strip-shaped. If the fan blades 120 are straightened, the entire fan blades 120 are in the shape of a rectangular strip. In this embodiment, the fan blades 120 are arranged in a swirling shape and extend. Both ends of the fan blades 120 are connected to the circumferential surface of the core shaft 110. Specifically, the shape of the fan blades 120 is described in detail in a dynamic way: one end of the fan blades 120 is connected to the circumferential surface of the core shaft 110 and extends away from the core shaft 110. When the fan blades 120 extend to a certain length, the fan blades 120 twist back (the twist angle is about 180 degrees) and extend towards the core shaft 110 until the other end of the fan blades 120 is connected to the circumferential surface of the core shaft 110.

[0027] Furthermore, the number of the fan blades 120 is multiple, and the multiple fan blades 120 are arranged on the circumferential surface of the core shaft 110 in a circular array with the axis of the core shaft 110 as the center. The multiple fan blades 120 work together to increase the air output. In this embodiment, the number of the fan blades 120 is three, and the three fan blades 120 are arranged on the circumferential surface of the core shaft 110 in a circular array. The core shaft 110 can drive the three fan blades 120 to rotate simultaneously to make the air flow form an air outlet flow. However, it is not limited to this. In other embodiments, the number of the fan blades 120 can be four or five, and the number of the fan blades 120 is not specifically limited.

[0028] It should be noted that the two ends of the fan blade 120 are spaced apart and both are connected to the circumferential surface of the core shaft 110. The fan blade 120 and the core shaft 110 together enclose an air guiding cavity 130 for air to pass through. Specifically, during the rotation of the axial flow fan 100 driven by the driving motor, the fan blade 120 agitates the air to form a negative pressure. During this process, the first part of the air passes through the gap between two adjacent fan blades 120, and the second part of the air passes through the air guiding cavity 130. Both parts of the air flow along the air outlet direction under the pressure of the fan blade 120. Compared with the prior art solution where the air conditioner outdoor unit fan can only drive the air to pass through the gap between two adjacent fan blades, in the present invention, the second part of the air passing through the air guiding cavity 130 can, on the one hand, increase the air output of the entire axial flow fan 100 and improve the efficiency of the fan blade, that is, improve the ability of the axial flow fan 100 to convert mechanical energy into wind energy when rotating. On the other hand, it can play a noise reduction role after converging with the first part of the air, greatly reducing the wind noise.

[0029] The fan blade 120 includes a first blade segment 121 and a second blade segment 122. Among them, the first blade segment 121 is a section before the fan blade 120 is twisted, and the second blade segment 122 is a section after the fan blade 120 is twisted. The first blade segment 121 and the second blade segment 122 are arranged in sequence along the air outlet direction and are both connected to the core shaft 110. That is, during the operation of the axial flow fan 100, the air outlet flow passes through the first blade segment 121 and the second blade segment 122 in sequence. In this embodiment, the first blade segment 121 and the second blade segment 122 are integrally formed to improve the connection strength, realize the integration of the fan blade 120, and thus improve the stability of the fan blade 120 during the air outlet process.

[0030] It is worth noting that the first blade segment 121 is provided with a first blade root 123, and the second blade segment 122 is provided with a second blade root 124. The first blade root 123 and the second blade root 124 are spaced apart and both are connected to the circumferential surface of the core shaft 110. That is, the first blade root 123 and the second blade root 124 are relatively arranged at both ends of the fan blade 120. The first blade root 123 and the second blade root 124 act together to fix the relative position of the fan blade 120 and the core shaft 110 and prevent the fan blade 120 from detaching from the core shaft 110.

[0031] In this embodiment, an air inlet trailing edge 126 is provided at one end of the first blade root 123 close to the second blade root 124, and an air outlet leading edge 127 is provided at one end of the second blade root 124 close to the first blade root 123. Since the first blade segment 121 and the second blade segment 122 are arranged in sequence along the air outlet direction, the air inlet trailing edge 126 and the air outlet leading edge 127 are arranged in sequence along the air outlet direction. During the operation of the axial flow fan 100, the air inlet trailing edge 126 conducts air in the direction close to the second blade segment 122, and the air outlet leading edge 127 is used to introduce air into the second blade segment 122. Specifically, the air inlet trailing edge 126 and the air outlet leading edge 127 are arranged in a circumferential offset on the core shaft 110, that is, in the circumferential direction of the core shaft 110, there is a gap between the air inlet trailing edge 126 and the air outlet leading edge 127, and this gap is located within the projection of the air guiding cavity 130 on the cross-section of the core shaft 110, so as to facilitate the outward conduction of the axial air flow along the air outlet direction, improve the ability of the axial flow fan 100 to convert mechanical energy into wind energy when rotating, improve the blade efficiency, reduce energy consumption, reduce operating costs, and increase the air volume and improve the heat dissipation effect.

[0032] Preferably, the included angle range between the air inlet trailing edge 126 and the air outlet leading edge 127 in the circumferential direction of the core shaft 110 is 15 degrees to 20 degrees. By limiting the included angle between the air inlet trailing edge 126 and the air outlet leading edge 127 in the circumferential direction of the core shaft 110, the size of the gap between the air inlet trailing edge 126 and the air outlet leading edge 127 in the circumferential direction of the core shaft 110 can be controlled, and while ensuring the air outlet effect, the axial air flow is increased, thereby improving the blade efficiency and increasing the air volume. For the convenience of understanding, the included angle between the air inlet trailing edge 126 and the air outlet leading edge 127 in the circumferential direction of the core shaft 110 is denoted as a.

[0033] In this embodiment, the included angle between the air inlet trailing edge 126 and the air outlet leading edge 127 in the circumferential direction of the core shaft 110 is 17 degrees. A reasonable included angle between the air inlet trailing edge 126 and the air outlet leading edge 127 in the circumferential direction of the core shaft 110 can further increase the air flow rate entering the air guiding cavity 130 axially, thereby increasing the air volume of the entire axial flow fan 100 and improving the ability of the axial flow fan 100 to convert mechanical energy into wind energy when rotating, that is, improving the blade efficiency. However, it is not limited to this. In other embodiments, the included angle between the air inlet trailing edge 126 and the air outlet leading edge 127 in the circumferential direction of the core shaft 110 can be 15 degrees or 20 degrees, and the size of the included angle between the air inlet trailing edge 126 and the air outlet leading edge 127 in the circumferential direction of the core shaft 110 is not specifically limited.

[0034] Further, an air inlet leading edge 125 is provided at one end of the first blade root 123 away from the second blade root 124. The air inlet leading edge 125 and the air inlet trailing edge 126 are arranged in sequence along the air outlet direction. During the operation of the axial flow fan 100, the air inlet leading edge 125 cuts the air first, and the air inlet trailing edge 126 cuts the air later. Specifically, the first blade root 123 is arranged in an airfoil shape. The first blade root 123 has a first chord line 1231. The first chord line 1231 is connected between the air inlet leading edge 125 and the air inlet trailing edge 126. The first chord line 1231 is used to calibrate the connection direction between the first blade root 123 and the core shaft 110. The first chord line 1231 is inclined to the axial direction of the core shaft 110, so that the first blade root 123 is inclined to the axial direction of the core shaft 110. Since the air outlet direction is in the axial direction of the core shaft 110 and the first blade root 123 is arranged in the first blade segment 121, during the rotation of the axial flow fan 100, the inclined first blade segment 121 will generate a certain pressure on the air, so that the air flows in the air outlet direction, improving the blade efficiency and the air output volume.

[0035] Preferably, the included angle range of the air inlet leading edge 125 and the air inlet trailing edge 126 in the circumferential direction of the core shaft 110 is 55 degrees to 65 degrees. By limiting the included angle of the air inlet leading edge 125 and the air inlet trailing edge 126 in the circumferential direction of the core shaft 110, the setting angle of the first blade root 123 in the circumferential direction of the core shaft 110 can be controlled, so as to determine the inclination degree of the first blade root 123 relative to the axial direction of the core shaft 110, ensuring that the first blade segment 121 can exert sufficient pressure on the air during the rotation of the axial flow fan 100 and enhancing the air outlet effect. For the convenience of understanding, the included angle of the air inlet leading edge 125 and the air inlet trailing edge 126 in the circumferential direction of the core shaft 110 is denoted as b.

[0036] In this embodiment, the included angle of the air inlet leading edge 125 and the air inlet trailing edge 126 in the circumferential direction of the core shaft 110 is 61 degrees. A reasonable included angle of the air inlet leading edge 125 and the air inlet trailing edge 126 in the circumferential direction of the core shaft 110 can further enhance the pressure on the air, improve the air outlet effect and the air output volume, and improve the blade efficiency. However, it is not limited to this. In other embodiments, the included angle of the air inlet leading edge 125 and the air inlet trailing edge 126 in the circumferential direction of the core shaft 110 can be 55 degrees or 65 degrees. The size of the included angle of the air inlet leading edge 125 and the air inlet trailing edge 126 in the circumferential direction of the core shaft 110 is not specifically limited.

[0037] Correspondingly, an air outlet trailing edge 128 is provided at one end of the second blade root 124 away from the first blade root 123. The air outlet leading edge 127 and the air outlet trailing edge 128 are arranged in sequence along the air outlet direction. During the operation of the axial flow fan 100, the air outlet leading edge 127 cuts the air first, and the air outlet trailing edge 128 cuts the air later. Specifically, the second blade root 124 is arranged in an airfoil shape. The second blade root 124 has a second chord line 1241. The second chord line 1241 is connected between the air outlet leading edge 127 and the air outlet trailing edge 128. The second chord line 1241 is used to calibrate the connection direction between the second blade root 124 and the core shaft 110. The second chord line 1241 is inclined to the axial direction of the core shaft 110, so that the second blade root 124 is inclined to the axial direction of the core shaft 110. Since the air outlet direction is located in the axial direction of the core shaft 110 and the second blade root 124 is arranged in the second blade segment 122, during the rotation of the axial flow fan 100, the inclined second blade segment 122 will generate a certain pressure on the air to make the air flow in the air outlet direction, further improving the blade efficiency and the air output volume.

[0038] Preferably, the included angle range between the air outlet leading edge 127 and the air outlet trailing edge 128 in the circumferential direction of the core shaft 110 is 50 degrees to 60 degrees. By limiting the included angle between the air outlet leading edge 127 and the air outlet trailing edge 128 in the circumferential direction of the core shaft 110, the setting angle of the second blade root 124 in the circumferential direction of the core shaft 110 can be controlled, so as to determine the inclination degree of the second blade root 124 relative to the axial direction of the core shaft 110, ensuring that the second blade segment 122 can exert sufficient pressure on the air during the rotation of the axial flow fan 100 and enhancing the air outlet effect. In addition, the included angle between the air inlet leading edge 125 and the air inlet trailing edge 126 in the circumferential direction of the core shaft 110 is the inlet angle of the air, and the included angle between the air outlet leading edge 127 and the air outlet trailing edge 128 in the circumferential direction of the core shaft 110 is the outlet angle of the air. The inlet angle is set to be greater than the outlet angle, that is, the included angle between the air inlet leading edge 125 and the air inlet trailing edge 126 in the circumferential direction of the core shaft 110 is greater than the included angle between the air outlet leading edge 127 and the air outlet trailing edge 128 in the circumferential direction of the core shaft 110, so as to further increase the pressure on the air, accelerate the air flow rate, and increase the air output volume. For the convenience of understanding, the included angle between the air outlet leading edge 127 and the air outlet trailing edge 128 in the circumferential direction of the core shaft 110 is denoted as c.

[0039] In this embodiment, the included angle between the air outlet leading edge 127 and the air outlet trailing edge 128 in the circumferential direction of the core shaft 110 is 54 degrees. A reasonable included angle between the air outlet leading edge 127 and the air outlet trailing edge 128 in the circumferential direction of the core shaft 110 can further enhance the pressure on the air, improve the air outlet effect and the air output volume, and improve the blade efficiency. However, it is not limited to this. In other embodiments, the included angle between the air outlet leading edge 127 and the air outlet trailing edge 128 in the circumferential direction of the core shaft 110 can be 50 degrees or 60 degrees, and the size of the included angle between the air outlet leading edge 127 and the air outlet trailing edge 128 in the circumferential direction of the core shaft 110 is not specifically limited.

[0040] In the embodiment of the present invention, for the axial flow fan 100, the fan blade 120 is strip-shaped and extends in a swirling shape. The fan blade 120 includes a first blade segment 121 and a second blade segment 122 which are integrally formed. The first blade segment 121 and the second blade segment 122 are arranged in sequence along the air outlet direction. The first blade segment 121 is provided with a first blade root 123, and the second blade segment 122 is provided with a second blade root 124. The first blade root 123 and the second blade root 124 are arranged at intervals and are both connected to the circumferential surface of the core shaft 110. One end of the first blade root 123 close to the second blade root 124 is provided with an air inlet trailing edge 126, and one end of the second blade root 124 close to the first blade root 123 is provided with an air outlet leading edge 127. The air inlet trailing edge 126 and the air outlet leading edge 127 are arranged in a circumferential dislocation on the core shaft 110. Compared with the prior art, since the axial flow fan 100 provided by the present invention adopts the first blade segment 121 and the second blade segment 122 arranged in sequence along the air outlet direction and the air inlet trailing edge 126 and the air outlet leading edge 127 arranged in a circumferential dislocation on the core shaft 110, it can improve the ability to convert mechanical energy into wind energy, improve the efficiency of the fan blade, reduce energy consumption, reduce operating costs, and increase the air volume and improve the heat dissipation effect.

[0041] Second Embodiment

[0042] The present invention provides an air conditioner (not shown in the figure) for regulating the indoor air temperature. The air conditioner includes an outdoor unit and an indoor unit, and the outdoor unit includes a housing, a condenser, a drive motor, and the axial flow fan 100. Among them, the basic structure, principle, and technical effects generated by the axial flow fan 100 are the same as those in the first embodiment. For a brief description, for the parts not mentioned in this embodiment, reference can be made to the corresponding content in the first embodiment.

[0043] In this embodiment, the outdoor unit of the air conditioner is installed outdoors and is connected to the indoor unit. The outdoor unit and the indoor unit work together to achieve the function of regulating the indoor air temperature. The condenser, the drive motor, and the axial flow fan 100 are all arranged in the housing. The drive motor is connected to the axial flow fan 100, and the position of the axial flow fan 100 corresponds to the position of the condenser. The axial flow fan 100 can form a negative pressure during rotation to drive the air flow to form an air outlet airflow, and this air outlet airflow can air-cool the condenser to take away the heat of the condenser and ensure the normal operation of the condenser, so as to realize the function of heating or cooling the indoor by the indoor unit of the air conditioner.

[0044] The beneficial effects of the air conditioner described in the embodiment of the present invention are the same as those of the first embodiment and will not be elaborated here.

[0045] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. An axial flow fan, characterized in that, It includes a mandrel (110) and fan blades (120). The fan blades (120) are in strip shape and extend in a swirling manner. The fan blades (120) include an integrally formed first blade segment (121) and a second blade segment (122). The first blade segment (121) and the second blade segment (122) are arranged in sequence along the air outlet direction. The first blade segment (121) is provided with a first blade root (123), and the second blade segment (122) is provided with a second blade root (124). The first blade root (123) and the second blade root (124) are spaced apart and are both connected to the circumferential surface of the mandrel (110). One end of the first blade root (123) close to the second blade root (124) is provided with an air inlet trailing edge (126), and one end of the second blade root (124) close to the first blade root (123) is provided with an air outlet leading edge (127). The air inlet trailing edge (126) and the air outlet leading edge (127) are arranged offset in the circumferential direction of the mandrel (110).

2. The axial flow fan according to claim 1, wherein The included angle range between the air inlet trailing edge (126) and the air outlet leading edge (127) in the circumferential direction of the mandrel (110) is from 15 degrees to 20 degrees.

3. The axial flow fan according to claim 2, wherein, The included angle between the air inlet trailing edge (126) and the air outlet leading edge (127) in the circumferential direction of the mandrel (110) is 17 degrees.

4. The axial flow fan according to claim 1, wherein One end of the first blade root (123) far from the second blade root (124) is provided with an air inlet leading edge (125). The included angle range between the air inlet leading edge (125) and the air inlet trailing edge (126) in the circumferential direction of the mandrel (110) is from 55 degrees to 65 degrees.

5. The axial flow fan according to claim 4, wherein, The included angle between the air inlet leading edge (125) and the air inlet trailing edge (126) in the circumferential direction of the mandrel (110) is 61 degrees.

6. The axial flow fan according to claim 4, wherein, The first blade root (123) is arranged in an airfoil shape. The first blade root (123) has a first chord line (1231). The first chord line (1231) is connected between the air inlet leading edge (125) and the air inlet trailing edge (126). The first chord line (1231) is inclined to the axial direction of the mandrel (110).

7. The axial flow fan according to claim 1, characterized in that, One end of the second blade root (124) far from the first blade root (123) is provided with an air outlet trailing edge (128). The included angle range between the air outlet trailing edge (128) and the air outlet leading edge (127) in the circumferential direction of the mandrel (110) is from 50 degrees to 60 degrees.

8. The axial flow fan according to claim 7, wherein, The included angle between the air outlet trailing edge (128) and the air outlet leading edge (127) in the circumferential direction of the mandrel (110) is 54 degrees.

9. The axial flow fan according to claim 7, wherein The second blade root (124) is arranged in an airfoil shape. The second blade root (124) has a second chord line (1241). The second chord line (1241) is connected between the air outlet leading edge (127) and the air outlet trailing edge (128). The second chord line (1241) is inclined to the axial direction of the mandrel (110).

10. An air conditioner, characterized in that, It includes a driving motor and an axial flow fan as described in any one of claims 1 to 9. The driving motor is connected to the mandrel (110).

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