Axial flow fan blade and air conditioner

Abstract

The utility model discloses an axial flow fan blade and an air conditioner, and relates to the technical field of air conditioners. The axial flow fan blade comprises a wheel shaft and strip-shaped blades. The strip-shaped blades extend in a rotary shape, a first blade root is arranged at one end of each strip-shaped blade, a second blade root is arranged at the other end of each strip-shaped blade, and the first blade roots and the second blade roots are both in a wing shape and are both connected to the circumferential surface of the wheel shaft; the wing shape of the first blade root is provided with a first chord line, the wing shape of the second blade root is provided with a second chord line, and the distance between the midpoint of the first chord line and the midpoint of the second chord line in the axial direction of the wheel shaft is a first distance; the maximum distance between the strip-shaped blades and the axis of the wheel shaft in the radial direction of the wheel shaft is a second distance; the ratio of the difference between the second distance and the radius of the axle to the first distance ranges from 1.5 to 2.5. According to the axial flow fan blade, the axial air outlet effect can be enhanced, the air outlet amount can be increased, the fan blade efficiency can be improved, the air noise can be reduced, and the user experience can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an axial flow fan blade and an air conditioner. Background Art

[0002] At present, with the improvement of living standards, air conditioners have become an indispensable household appliance in thousands of households. The air conditioner includes an indoor unit and an outdoor unit, wherein 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 generally dissipates heat through axial flow fan blades, but the current axial flow fan blades are limited by their shape and structure, and the axial air outlet effect is poor, the air volume is small, the fan blade efficiency is low, and the wind noise is large, which affects the user experience. Utility Model Content

[0003] The problem solved by the utility model is how to enhance the axial air outlet effect, increase the air outlet volume, improve the efficiency of the fan blades, reduce wind noise, and improve the user experience.

[0004] To solve the above problems, the technical solution of the utility model is achieved as follows:

[0005] In the first aspect, the utility model provides an axial flow fan blade, including a wheel shaft and a strip blade, the strip blade is extended in a spiral shape, a first blade root is arranged at one end of the strip blade, and a second blade root is arranged at the other end, the first blade root and the second blade root are both airfoil-shaped and are both connected to the circumferential surface of the wheel shaft; the airfoil of the first blade root has a first chord, the airfoil of the second blade root has a second chord, and the distance between the midpoint of the first chord and the midpoint of the second chord in the axial direction of the wheel shaft is a first distance; the maximum distance between the strip blade and the axis of the wheel shaft in the radial direction of the wheel shaft is a second distance; the ratio of the difference between the second distance and the wheel shaft radius to the first distance is in the range of 1.5 to 2.5. Compared with the prior art, the axial flow fan blade provided by the utility model can enhance the axial wind outlet effect, increase the wind outlet volume, improve the efficiency of the fan blade, reduce wind noise, and improve the user experience because it adopts a strip blade that extends in a spiral shape and limits the ratio of the difference between the second distance and the wheel shaft radius to the first distance within a certain range.

[0006] Furthermore, the ratio of the difference between the second spacing and the wheel axle radius to the first spacing is 2. A reasonable ratio of the preset distance to the first spacing can make the ribbon blades more aerodynamic, thereby guiding the radial airflow to the axial direction to a greater extent, further enhancing the axial wind outlet effect, increasing the air outlet volume, improving the efficiency of the fan blades, and reducing wind noise.

[0007] Furthermore, the second spacing ranges from 180 mm to 220 mm. By limiting the second spacing, the outer diameter of the entire axial flow fan blade can be controlled to adapt to different models of air conditioner outdoor units, ensuring that different models of air conditioner outdoor units have good air outlet effects and low wind noise.

[0008] Furthermore, the second spacing is 203 mm. A reasonable second spacing can reduce wind noise as much as possible while ensuring the air volume, thereby improving the efficiency of the fan blades.

[0009] Furthermore, the radius of the wheel axle ranges from 20 mm to 40 mm. By limiting the radius of the wheel axle and limiting the second spacing, the preset distance can be limited within a certain range, so that the preset distance and the radius of the wheel axle are adapted, and the wheel axle can drive the belt-shaped fan blades to rotate stably under the action of the driving motor, thereby improving the efficiency of the fan blades.

[0010] Furthermore, the radius of the wheel axle is 30 mm. A reasonable wheel axle radius can ensure the connection strength between the wheel axle and the drive motor, and further improve the stability of driving the belt-shaped fan blades to rotate, thereby improving the efficiency of the fan blades.

[0011] Furthermore, the maximum spacing of the strip blades on the cross section of the wheel shaft is a third spacing, the third spacing is perpendicular to the straight line where the second spacing is located, and the range of the third spacing is 120 mm to 140 mm. By limiting the third spacing, the width of a single strip blade can be controlled, thereby determining the projected area of ​​the guide cavity on the cross section of the wheel shaft, increasing the air volume, and improving the efficiency of the fan blade.

[0012] Furthermore, the third spacing is 134 mm. A reasonable third spacing can maximize the projection area of ​​the guide cavity on the cross section of the wheel shaft while ensuring low wind noise, further enhance the axial wind outlet effect, increase the wind volume, and improve the efficiency of the fan blades.

[0013] Furthermore, there are multiple strip blades, which are arranged on the circumference of the axle in a circular array with the axle center as the center. The axle can simultaneously drive the multiple strip blades to rotate, so that the air flows to form an outlet airflow, and the multiple strip blades work together to increase the air volume and improve the efficiency of the fan blades.

[0014] In the second aspect, the utility model provides an air conditioner, comprising a driving motor and the above-mentioned axial flow fan blade, the axial flow fan blade comprises a wheel shaft and a strip blade, the driving motor is connected to the wheel shaft, the strip blade is extended in a spiral shape, one end of the strip blade is provided with a first blade root, and the other end is provided with a second blade root, the first blade root and the second blade root are both airfoil-shaped and are both connected to the circumference of the wheel shaft; the airfoil of the first blade root has a first chord, the airfoil of the second blade root has a second chord, the midpoint of the first chord and the midpoint of the second chord in the axial direction of the wheel shaft are the first spacing; the maximum spacing between the strip blade and the axis of the wheel shaft in the radial direction of the wheel shaft is the second spacing; the ratio of the difference between the second spacing and the wheel shaft radius to the first spacing is in the range of 1.5 to 2.5. The air conditioner can enhance the axial air outlet effect, increase the air outlet volume, improve the efficiency of the fan blades, reduce wind noise, and enhance the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the axial flow fan blade according to the first embodiment of the utility model from one viewing angle;

[0016] Figure 2 It is a schematic structural diagram of the axial flow fan blade described in the first embodiment of the utility model from another perspective;

[0017] Figure 3 It is a mathematical model diagram of the axial flow fan blade of the first embodiment of the utility model from one viewing angle;

[0018] Figure 4 It is a mathematical model diagram of the axial flow fan blade described in the first embodiment of the utility model from another perspective.

[0019] Description of reference numerals:

[0020] 100 - axial flow fan blade; 110 - wheel axle; 120 - strip-shaped blade; 121 - first blade root; 122 - second blade root; 123 - first chord line; 124 - second chord line; 130 - flow guide cavity. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] First embodiment

[0023] Please refer to Figures 1 to 4 The embodiment of the utility model provides an axial flow fan blade 100 for driving air flow, which can enhance the axial wind discharge effect, increase the wind discharge volume, improve the fan blade efficiency, reduce wind noise, and enhance the user experience.

[0024] It should be noted that the axial flow fan blade 100 is applied to the air conditioner outdoor unit (not shown), which is installed outdoors and connected to the air conditioner indoor unit (not shown). The air conditioner outdoor unit and the air conditioner indoor unit work together to achieve the function of regulating the indoor temperature. The air conditioner outdoor unit includes a condenser (not shown), a drive motor (not shown) and a shell (not shown), wherein the condenser, the drive motor and the axial flow fan blade 100 are all arranged in the shell, and the shell is used to shield and protect the condenser, the drive motor and the axial flow fan blade 100. The drive motor is connected to the axial flow fan blade 100 to drive the axial flow fan blade 100 to rotate. The position of the axial flow fan blade 100 corresponds to the position of the condenser, and the condenser is used to exchange heat with the refrigerant. The axial flow fan blade 100 can form a negative pressure during the rotation process to drive the air flow to form an outlet airflow, which 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 blade 100 includes a wheel shaft 110 and a strip blade 120. The wheel shaft 110 is cylindrical, and the strip blade 120 is fixedly connected to the circumference of the wheel shaft 110. The wheel shaft 110 is used to drive the strip blade 120 to rotate. The strip blade 120 can generate negative pressure during the rotation process to drive air flow. Specifically, the wheel shaft 110 is used to be connected to a driving motor, and the driving motor can drive the strip blade 120 to rotate through the wheel shaft 110.

[0026] It is worth noting that the strip-shaped blade 120 is in the shape of a strip as the name implies. If the strip-shaped blade 120 is straightened, the entire strip-shaped blade 120 is in the shape of a rectangular strip. In the present embodiment, the strip-shaped blade 120 is extended in a spiral shape, and both ends of the strip-shaped blade 120 are connected to the circumference of the axle 110. Specifically, the shape of the strip-shaped blade 120 is described in detail in a dynamic manner: one end of the strip-shaped blade 120 is connected to the circumference of the axle 110 and extends in a direction away from the axle 110. When the strip-shaped blade 120 extends to a certain length, the strip-shaped blade 120 twists back (the twisting angle is about 180 degrees) and extends in a direction close to the axle 110 until the other end of the strip-shaped blade 120 is connected to the circumference of the axle 110.

[0027] Furthermore, there are multiple strip blades 120, and the multiple strip blades 120 are arranged on the circumference of the axle 110 in a circular array with the axis of the axle 110 as the center of the circle. The multiple strip blades 120 work together to increase the air volume. In this embodiment, there are three strip blades 120, and the three strip blades 120 are arranged on the circumference of the axle 110 in a circular array. The axle 110 can drive the three strip blades 120 to rotate at the same time, so that the air flows to form an air flow. However, it is not limited to this. In other embodiments, the number of strip blades 120 can be four or five, and the number of strip blades 120 is not specifically limited.

[0028] It should be noted that a first blade root 121 is provided at one end of the strip blade 120, and a second blade root 122 is provided at the other end. The first blade root 121 and the second blade root 122 are relatively arranged at the two ends of the strip blade 120. The first blade root 121 and the second blade root 122 are both airfoil-shaped and are both connected to the circumferential surface of the wheel axle 110. The first blade root 121 and the second blade root 122 work together to fix the relative position of the strip blade 120 and the wheel axle 110 to prevent the strip blade 120 from detaching from the wheel axle 110.

[0029] In this embodiment, the first blade root 121 and the second blade root 122 are arranged at intervals, and the strip blades 120 and the wheel shaft 110 together form a guide cavity 130, and the guide cavity 130 is used for air to pass through. Specifically, when the driving motor drives the axial flow fan blade 100 to rotate, the strip blades 120 stir the air to form a negative pressure. In this process, the first part of the air passes through the gap between two adjacent strip blades 120, and the second part of the air passes through the guide cavity 130. Both parts of the air flow in the air outlet direction under the pressure of the strip blades 120. Compared with the solution in the prior art that the axial flow fan can only drive air to pass through the gap between two adjacent fan blades, the second part of air passing through the guide cavity 130 in the utility model can, on the one hand, increase the air output of the entire axial flow fan blade 100 and improve the efficiency of the fan blade, that is, improve the ability of the axial flow fan blade 100 to convert mechanical energy into wind energy when rotating; on the other hand, it can play a silencing role after merging with the first part of air, thereby greatly reducing wind noise.

[0030] Preferably, the airfoil of the first blade root 121 has a first chord 123, and the airfoil of the second blade root 122 has a second chord 124. The distance between the midpoint of the first chord 123 and the midpoint of the second chord 124 in the axial direction of the axle 110 is a first distance, and the first distance is used to control the degree of misalignment of the first blade root 121 and the second blade root 122 in the axial direction of the axle 110. The maximum distance between the belt-shaped blade 120 and the axis of the axle 110 in the radial direction of the axle 110 is a second distance, and the second distance is used to control the outer diameter size of the entire axial flow fan blade 100.

[0031] Specifically, the ratio of the difference between the second spacing and the radius of the axle 110 to the first spacing is in the range of 1.5 to 2.5, and the difference between the second spacing and the radius of the axle 110 is expressed as a preset distance, which is used to control the extension length of the strip blade 120 before or after twisting (the extension length before twisting is equal to the extension length after twisting). By limiting the ratio of the preset distance to the first spacing, the swirling shape of the strip blade 120 can be determined to guide the radial airflow to the axial direction, thereby enhancing the axial wind outlet effect, increasing the air outlet volume, improving the efficiency of the fan blade, reducing wind noise, and improving the user experience. For ease of understanding, the first spacing is represented as A, the second spacing is represented as B, the preset distance is represented as C, and the radius of the axle 110 is represented as D.

[0032] In this embodiment, the ratio of the difference between the second spacing and the radius of the axle 110 to the first spacing is 2, that is, the ratio of the preset distance to the first spacing is 2. A reasonable ratio of the preset distance to the first spacing can make the strip blades 120 more aerodynamic, thereby guiding the radial airflow to the axial direction to a greater extent, further enhancing the axial wind outlet effect, increasing the air volume, improving the efficiency of the blades, and reducing wind noise. However, it is not limited to this. In other embodiments, the ratio of the difference between the second spacing and the radius of the axle 110 to the first spacing can be 1.5 or 2.5, and the ratio of the difference between the second spacing and the radius of the axle 110 to the first spacing is not specifically limited.

[0033] Furthermore, the second spacing ranges from 180 mm to 220 mm. By limiting the second spacing, the outer diameter of the entire axial flow fan blade 100 can be controlled to adapt to different models of air conditioner outdoor units, ensuring that different models of air conditioner outdoor units have good air outlet effects and low wind noise.

[0034] In this embodiment, the second spacing is 203 mm. A reasonable second spacing can reduce wind noise as much as possible while ensuring the air volume, thereby improving the efficiency of the fan blades. However, this is not limited to this. In other embodiments, the second spacing can be 180 mm or 220 mm, and the size of the second spacing is not specifically limited.

[0035] Furthermore, the radius of the axle 110 ranges from 20 mm to 40 mm. By limiting the radius of the axle 110 and the above-mentioned limitation on the second spacing, the preset distance can be limited within a certain range, so that the preset distance and the radius of the axle 110 are adapted, and the axle 110 can drive the belt-shaped fan blades to rotate stably under the action of the driving motor, thereby improving the efficiency of the fan blades.

[0036] In this embodiment, the radius of the axle 110 is 30 mm. A reasonable radius of the axle 110 can ensure the connection strength between the axle 110 and the drive motor, and further improve the stability of driving the belt-shaped fan blades to rotate, thereby improving the efficiency of the fan blades. However, this is not limited to this. In other embodiments, the radius of the axle 110 can be 20 mm or 40 mm, and the radius of the axle 110 is not specifically limited.

[0037] It is worth noting that the maximum spacing of the strip blades 120 on the cross section of the axle 110 is the third spacing, the third spacing is perpendicular to the straight line where the second spacing is located, and the range of the third spacing is 120 mm to 140 mm. By limiting the third spacing, the width of a single strip blade 120 can be controlled, thereby determining the projected area of ​​the guide cavity 130 on the cross section of the axle 110, increasing the air volume, and improving the efficiency of the fan blade. For ease of understanding, the third spacing is represented as E.

[0038] In this embodiment, the third spacing is 134 mm. A reasonable third spacing can maximize the projection area of ​​the guide cavity 130 on the cross section of the axle 110 while ensuring low wind noise, further enhance the axial wind discharge effect, increase the wind volume, and improve the efficiency of the fan blades. However, this is not limited to this. In other embodiments, the third spacing can be 120 mm or 140 mm, and the size of the third spacing is not specifically limited.

[0039] The axial flow fan blade 100 described in the embodiment of the utility model has a strip blade 120 extending in a spiral shape, a first blade root 121 is provided at one end of the strip blade 120, and a second blade root 122 is provided at the other end, the first blade root 121 and the second blade root 122 are both airfoil-shaped and are both connected to the circumferential surface of the wheel axle 110; the airfoil presented by the first blade root 121 has a first chord 123, and the airfoil presented by the second blade root 122 has a second chord 124, and the spacing between the midpoint of the first chord 123 and the midpoint of the second chord 124 in the axial direction of the wheel axle 110 is a first spacing; the maximum spacing between the strip blade 120 and the axis of the wheel axle 110 in the radial direction of the wheel axle 110 is a second spacing; the ratio of the difference between the second spacing and the radius of the wheel axle 110 to the first spacing is in the range of 1.5 to 2.5. Compared with the prior art, the axial flow fan blade 100 provided by the utility model adopts a strip blade 120 extending in a spiral shape and limits the ratio of the difference between the second spacing and the radius of the wheel axle 110 to the first spacing within a certain range. Therefore, it can enhance the axial wind outlet effect, increase the air outlet volume, improve the fan blade efficiency, reduce wind noise, and improve the user experience.

[0040] Second embodiment

[0041] The utility model provides an air conditioner (not shown) for controlling indoor temperature. The air conditioner includes an air conditioner outdoor unit and an air conditioner indoor unit, and the air conditioner outdoor unit includes a housing, a condenser, a drive motor and an axial flow fan blade 100. The basic structure and principle of the axial flow fan blade 100 and the technical effect produced are the same as those of the first embodiment. For the sake of brief description, for the parts not mentioned in this embodiment, reference can be made to the corresponding contents in the first embodiment.

[0042] In this embodiment, the air conditioner outdoor unit is installed outdoors and connected to the air conditioner indoor unit. The air conditioner outdoor unit and the air conditioner indoor unit work together to achieve the function of regulating the indoor temperature. The condenser, the drive motor and the axial flow fan blade 100 are all arranged in the shell. The drive motor is connected to the axial flow fan blade 100, and the position of the axial flow fan blade 100 corresponds to the position of the condenser. The axial flow fan blade 100 can form a negative pressure during the rotation process to drive the air flow to form an outlet air flow. The outlet air flow can cool the condenser to take away the heat of the condenser and ensure the normal operation of the condenser, thereby realizing the function of the air conditioner indoor unit to heat or cool the room.

[0043] The beneficial effects of the air conditioner described in the embodiment of the utility model are the same as those of the first embodiment, and will not be repeated here.

[0044] Although the utility model is disclosed as above, the utility model 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 utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

Claims

1. An axial flow fan blade, characterized in that: The invention comprises a wheel shaft (110) and a belt-shaped blade (120), wherein the belt-shaped blade (120) is extended in a spiral shape, a first blade root (121) is arranged at one end of the belt-shaped blade (120), and a second blade root (122) is arranged at the other end, the first blade root (121) and the second blade root (122) are both airfoil-shaped and are both connected to the circumferential surface of the wheel shaft (110); the airfoil of the first blade root (121) has a first chord (123), and the airfoil of the second blade root (122) has a second chord (124), and the distance between the midpoint of the first chord (123) and the midpoint of the second chord (124) in the axial direction of the wheel shaft (110) is a first distance; The maximum distance between the belt-shaped blade (120) and the axis of the wheel shaft (110) in the radial direction of the wheel shaft (110) is a second distance; The ratio of the difference between the second spacing and the radius of the wheel axle (110) to the first spacing is in the range of 1.5 to 2.

5.

2. The axial flow fan blade according to claim 1, characterized in that: The ratio of the difference between the second spacing and the radius of the wheel axle (110) to the first spacing is 2.

3. The axial flow fan blade according to claim 1, characterized in that: The second spacing ranges from 180 mm to 220 mm.

4. The axial flow fan blade according to claim 3, characterized in that: The second spacing is 203 mm.

5. The axial flow fan blade according to claim 1, characterized in that: The radius of the wheel axle (110) ranges from 20 mm to 40 mm.

6. The axial flow fan blade according to claim 5, characterized in that: The radius of the wheel axle (110) is 30 mm.

7. The axial flow fan blade according to claim 1, characterized in that: The maximum spacing of the ribbon blades (120) on the cross section of the wheel axle (110) is a third spacing, the third spacing is perpendicular to the straight line where the second spacing is located, and the range of the third spacing is 120 mm to 140 mm.

8. The axial flow fan blade according to claim 7, characterized in that: The third spacing is 134 mm.

9. The axial flow fan blade according to claim 1, characterized in that: The number of the belt-shaped blades (120) is plural, and the plurality of belt-shaped blades (120) are arranged on the circumferential surface of the wheel shaft (110) in a circular array with the axis of the wheel shaft (110) as the center of the circle.

10. An air conditioner, characterized in that: It comprises a driving motor and the axial flow fan blade according to any one of claims 1 to 9, wherein the driving motor is connected to the wheel axle (110).

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