Cooling fan blade with variable blade mounting angle

Abstract

The utility model relates to a cooling fan blade with a variable blade mounting angle, which aims at solving the technical problems that the blade mounting angle of the existing similar product is difficult to rotate and change, and particularly, the state change of three blade mounting angles of a low configuration plate, a middle configuration plate and a high configuration plate is difficult to set according to the requirements of optical fiber switching equipment. The cooling fan blade is characterized in that blade variable mounting angles are arranged at the connecting positions of blades of the cooling fan blade and a hub, the blade angles of the blade variable mounting angles are changed by changing the mounting positions of the blades at the connecting positions of the hub, and the blade variable mounting angles between the blades and a horizontal hole in the hub are at least two gradually-decreased angles. The blades synchronously and downwards rotate by 33 degrees, 30 degrees and 27 degrees in sequence to be reduced through the blade variable installation angles of the blades at the hub connecting positions, and the blade variable installation angles of the blades are changed through the corresponding rails. The blades are designed to be rotatable blades, so that the installation angle of the blades is reduced, the maximum flow of the fan is reduced, and the maximum static pressure is increased.

Description

Technical Field

[0001] This utility model relates to a cooling fan, specifically a cooling fan blade with a variable blade mounting angle. Background Technology

[0002] Cooling fans generally refer to fans used for cooling motherboard devices such as CPUs and graphics cards. Their main purpose is to conduct heat away and blow it into the surrounding air to achieve a cooling effect. The core component is the impeller, with equidistant blades on the outer diameter of the impeller hub. Currently, cooling fans generally use a fixed blade mounting angle, resulting in fixed performance (PQ). If a customer's system is upgraded, the fan becomes unsuitable. To adapt to diverse market demands, some cooling fans have rotatable blade mounting angles, allowing for better matching with customer systems and ensuring the fan operates at maximum efficiency and minimum noise. Furthermore, the fan blade mounting angle design enhances the fan's functionality, increases its competitiveness, and makes it more adaptable and less prone to obsolescence. Due to market demand and price considerations, some rack-mounted cooling equipment (such as fiber optic switching equipment) is generally available in low-end, mid-range, and high-end versions. The system is divided into three configurations: Low-end version (with modules 1 and 2 inserted, system performance is average); Mid-end version (with modules 1, 2, 3, and 4 inserted, system performance is strong); High-end version (with modules 1, 2, 3, 4, and 5 inserted, system performance is at its peak). Adding modules to this type of rack-mounted cooling system alters the internal structure; increased system damping leads to reduced airflow. Furthermore, the maximum efficiency point, which is also the point of minimum noise, is known from the fan characteristic curve; fitting the fan's maximum efficiency point to the operating point is crucial during the design process. The fan stall area corresponds to abnormally high noise. The specific fan operating states for the high-end, mid-end, and low-end versions are as follows: In the high-end version, the fan operates in the high-pressure area, resulting in lower efficiency and higher noise; in the mid-end version, the fan operates in the stall area, resulting in average efficiency and maximum noise; in the low-end version, the fan operates in the optimal operating area, resulting in the highest efficiency and lowest noise. Summary of the Invention

[0003] To overcome the above shortcomings, the purpose of this utility model is to provide a cooling fan blade with a variable blade installation angle, thereby solving the technical problem that the blade installation angle of existing similar products is difficult to rotate and change, especially the difficulty in setting up three blade installation angle states (low-end, medium-end, and high-end) according to the requirements of fiber optic switching equipment. This objective is achieved through the following technical solution.

[0004] A cooling fan blade with a variable blade installation angle is disclosed. The main body of the cooling fan blade is an impeller, which includes a hub and blades. The blades are spirally and obliquely spaced at equal intervals on the outer diameter of the hub. The key structural design feature is a variable blade installation angle at the connection between the blade and the hub. This variable blade installation angle changes by varying the blade's installation position at the hub connection. The variable blade installation angles between the blade and the horizontal opening at the hub are at least two decreasing angles. This design allows the blade to rotate, thus changing the blade installation angle. A decrease in the blade installation angle reduces the maximum fan flow rate and increases the maximum static pressure, satisfying the blade installation angle variations required for low-end, mid-range, and high-end versions of fiber optic switching equipment.

[0005] The blades decrease in size by rotating downwards in sequence at 33 degrees, 30 degrees, and 27 degrees at the variable installation angle of the blades at the hub connection.

[0006] The first hub is a wheel hub, and the first blade is a blade. At the connection point between the first blade and the first hub, the outer diameter of the first blade's first profile is provided with a flat key surface. Each flat key surface has two mounting holes, one at the beginning and one at the end. One mounting hole on one side of the first hub's opening serves as a first track, and the other mounting hole on the spiral side of the first hub's outer diameter above the first track serves as a second track. Two protruding mounting heads are provided on one edge of the first blade corresponding to the first and second tracks. The mounting heads of the first blade are simultaneously inserted into the first and second tracks and slide at angles of 33 degrees, 30 degrees, and 27 degrees respectively. Nuts are provided on the mounting heads of the first blades that penetrate the first hub, thus fixing the first blade to the first hub. The above is a specific structural embodiment of a blade with a variable mounting angle of 33 degrees, 30 degrees, and 27 degrees, which is inserted into and slidably adjusted at the mounting holes in the hub. Alternatively, the blade can be fixed to the outer diameter of the hub using a point-to-point slot mounting method.

[0007] The first track of the first hub is "E" shaped, and three positioning holes are provided on one side of the first hub opening of the first track. The second track is waist-shaped, and the first track and the second track are inclined in the same direction.

[0008] The hub is a second hub, and the blade is a second blade. At the connection point between the second blade and the second hub, the second blade's outer diameter has at least two mounting grooves at the beginning and end. One end of each mounting groove is an inlet, communicating with the track groove of the mounting groove. One side of the track groove has raised stop grooves on the second blade, varying in angles of 33 degrees, 30 degrees, and 27 degrees respectively. The second hub side edge of the second blade has mounting posts corresponding to the mounting grooves. The mounting posts of the second blade are simultaneously inserted into the inlet at one end of the mounting groove and simultaneously interlocked and fixed to the corresponding stop grooves through the track groove of the mounting groove. The above is another specific structural embodiment of a blade with variable mounting angles of 33 degrees, 30 degrees, and 27 degrees, installed and slidably adjusted within the mounting groove at the hub. Alternatively, based on the structural design of the first hub, a corresponding flat key surface can be provided on the mounting side of the second blade on the second hub, and the mounting groove of the second hub can be further designed as a through hole. The mounting post of the second blade passes through the through hole of the second hub and is fixed to the second hub by a nut.

[0009] The mounting slot of the second wheel hub and its corresponding mounting inlet, track slot, and gear slot are all integrally formed in an "E" shape.

[0010] This utility model has a reasonable structural design, convenient blade installation and rotation, low noise, and high wind speed; it is suitable for use as a cooling fan blade with variable blade installation angle, and for further improvement of similar products. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention, in which the arrow indicates the direction of rotation of the first blade.

[0012] Figure 2 yes Figure 1 A schematic diagram of the structure with the two first blades removed.

[0013] Figure 3 yes Figure 1 A schematic diagram of the internal structure.

[0014] Figure 4 yes Figure 1 Working principle and structural diagram Figure 1 .

[0015] Figure 5 yes Figure 1 Working principle and structural diagram Figure 2 .

[0016] Figure 6 This is a three-dimensional structural diagram of Embodiment 2 of the present invention. The arrow in the diagram indicates the direction of rotation of the second blade.

[0017] Figure 7 yes Figure 6A schematic diagram of the structure with the two second blades removed.

[0018] Figure 8 yes Figure 7 This is a side view of the structure with the two second blades installed. The dotted lines in the figure indicate the positions of the two second blades.

[0019] Figure 9 yes Figure 6 A schematic diagram of the variable installation angle principle structure of one of the second blades.

[0020] Figure 10 This document presents the PQ curves and effect analysis of the low-end, medium-end, and high-end versions of the blades of this utility model at 33 degrees, 30 degrees, and 27 degrees.

[0021] Attached figures and their names: 1. Impeller, 101. First hub, 1011. Keyway, 1012. First track, 1013. Second track, 102. First blade, 1021. Mounting head, 103. Second hub, 1031. Mounting groove, 1032. Mounting inlet, 1033. Track, 1034. Gear groove, 104. Second blade, 1041. Mounting column, 4. Nut. Implementation

[0022] The structure and use of this utility model will now be further described with reference to the accompanying drawings. Figures 1-10 As shown, the main body of the cooling fan blade is an impeller 1, which includes a hub and blades. The blades are spirally and obliquely spaced at equal intervals on the outer diameter of the hub. A variable blade mounting angle is provided at the connection between the blade and the hub. The variable blade mounting angle changes the blade angle by changing the installation position of the blade at the hub connection. The variable blade mounting angles between the blade and the horizontal opening at the hub are 33 degrees, 30 degrees and 27 degrees, respectively.

[0023] Specifically: such as Figures 1-4In the first embodiment shown, the hub is a first hub 101, and the blade is a first blade 102. At the connection between the first blade and the first hub, the outer diameter of the first blade's first profile is provided with a flat key surface 1011. Each flat key surface has two mounting holes, one at the beginning and one at the end. One mounting hole on one side of the first hub's opening is a first track 1012, and the other mounting hole on the spiral side of the first hub's outer diameter above the first track is a second track 1013. Two protruding mounting heads 1021 are provided on one edge of the first blade corresponding to the first and second tracks. The mounting heads of the first blade are simultaneously inserted into the first and second tracks and slide at angles of 33 degrees, 30 degrees, and 27 degrees respectively. Nuts 4 are provided on the mounting heads of the first blades that penetrate the first hub, thus fixing the first blade to the first hub. The first track of the first hub is "E"-shaped, with three positioning holes on one side of the first hub's opening. The second track is waist-shaped, with three positioning holes on one side of the first track's hub's opening. The first and second tracks are inclined in the same direction.

[0024] like Figure 5 As shown, the first blade of the cooling fan is raised to the center OB and rotates along the radius RB. Specifically: 1) When the first blade is in the first positioning hole of the track, the installation angle of the first blade is the largest; 2) After the first blade is raised to the center OB and rotates along the radius RB, it slides to the second positioning hole; 3) When the first blade is in the second positioning hole of the track, the installation angle of the first blade decreases; 4) After the first blade is raised to the center OB and rotates along the radius RB, it slides to the third positioning hole; 5) When the first blade is in the third positioning hole of the track, the installation angle of the first blade is the smallest. The above track is the general term for the first track and the second track, and the corresponding positioning holes refer to the three positioning holes of the first track respectively; in the figure, the radius RA=RB, the center of circles OA1, OA2, OA3 is on the RA radius track of OA; the center of circles OB1, OB2, OB3 is on the RB radius track of OB; the center distance (OA,OB)=(OA1,OB1)=(OA2,OB2)=(OA3,OB3)=L.

[0025] Based on the structural design of Embodiment 1 above, as follows: Figures 6-9In the second embodiment shown, the hub is a second hub 103, and the blade is a second blade 104. At the connection point between the second blade and the second hub, three mounting grooves 1031 are provided on the outer diameter of the second profile of the second blade. One end of each mounting groove is a mounting inlet 1032, which communicates with the track groove 1033 of the mounting groove. On one side of the track groove, raised stop grooves 1034, varying at 33, 30, and 27 degrees respectively, are provided on the second blade. On the second hub side edge of each second blade, mounting posts 1041 corresponding to the mounting grooves are provided. The mounting posts of the second blade are simultaneously inserted into the mounting inlet at one end of the mounting groove and simultaneously interlocked with the track groove of the mounting groove to be fixed to the corresponding stop groove. The mounting groove of the second hub and the corresponding mounting inlet, track groove, and stop groove are all integrally formed in an "E" shape.

[0026] The second blade of the cooling fan is simultaneously inserted into the three mounting slots on one side of the second hub through a mounting post. The second blade is then lifted and rotated along the track, simultaneously engaging the corresponding slot. The specific steps are as follows: 1. When the second blade engages the first slot on the track, its installation angle is at its maximum; 2. The second blade is lifted to the track, rotated along the track, and slid into the second slot; 3. When the second blade is in the second slot on the track, its installation angle decreases; 4. The second blade is lifted to the track, rotated along the track, and slid into the third slot; 5. When the second blade is in the third slot on the track, its installation angle is at its minimum.

[0027] like Figure 10 As shown, when the system is upgraded from a low-end configuration to a high-end configuration, the blade installation angle changes from large to small; it matches the system; it obtains the optimal operating point; at this time, the fan operates in the maximum efficiency range and the noise is also minimal.

[0028] 1. In the low-end version of the system: the system damping is minimal, the blade installation angle is maximum, and the fan PQ is matched with the system impedance. At this point, the efficiency is highest and the noise is also minimal.

[0029] 2. When the fan is matched with the system: the system damping increases, the blades rotate downwards, and the blade installation angle decreases, so that the fan PQ matches the system impedance. At this time, the fan efficiency reaches its maximum and the noise is minimized.

[0030] 3. In the high-configuration version of the system: the system damping is at its maximum, the blades continue to rotate downwards, and the blade installation angle is at its minimum, so that the fan PQ matches the system impedance. At this time, the fan efficiency is also at its highest and the noise is also the lowest.

[0031] The above description is intended to illustrate the technical means of this utility model and is not intended to limit the technical scope of this utility model. Any obvious improvements or substitutions made to this utility model by those skilled in the art based on existing common knowledge also fall within the protection scope of the claims of this utility model. For example, the mounting hole on the blade side of the outer diameter of the profile omits the mounting inlet and track, and is directly fastened and fixed to the gear slot in a point-to-point manner.

Claims

1. A cooling fan blade with a variable blade mounting angle, wherein the main body of the cooling fan blade is an impeller (1), the impeller comprising a hub and blades, the blades being helically and obliquely spaced at equal intervals on the outer diameter of the hub; characterized in that The blade is provided with a variable blade mounting angle at the connection between the blade and the hub. The variable blade mounting angle changes the blade angle by changing the installation position of the blade at the hub connection. The variable blade mounting angle between the blade and the horizontal opening at the hub is at least two decreasing angles. The blade rotates downwards in sequence at 33 degrees, 30 degrees and 27 degrees by the variable blade mounting angle at the hub connection.

2. The variable blade installation angle cooling fan blade according to claim 1, characterized in that... The hub is a first hub (101), and the blade is a first blade (102). The first blade at the connection between the first blade and the first hub has a flat key surface (1011) on its first outer diameter. The flat key surface has two mounting holes at the beginning and end. The mounting hole on one side of the first hub is a first track (1012), and the other mounting hole on the spiral side of the first hub above the first track is a second track (1013). The first blade on one side of the first track and the second track has two protruding mounting heads (1021). The mounting heads of the first blade are inserted into the first track and the second track and slide at 33 degrees, 30 degrees and 27 degrees respectively. The mounting heads of the first blade that penetrate the first hub have nuts (4) respectively. The first blade is fixedly set on the first hub.

3. The variable blade installation angle cooling fan blade according to claim 2, characterized in that... The first track (1012) of the first hub (101) is "E" shaped, and three positioning holes are provided on one side of the first hub opening of the first track. The second track (1013) is waist-shaped, and the first track and the second track are inclined in the same direction.

4. The variable blade installation angle cooling fan blade according to claim 1, characterized in that... The hub is a second hub (103), and the blade is a second blade (104). At least two mounting grooves (1031) are provided at the beginning and end of the second profile outer diameter of the second blade at the connection between the second blade and the second hub. One end of the mounting groove is a mounting inlet (1032), which communicates with the track groove (1033) of the mounting groove. On one side of the track groove, there are raised stop grooves (1034) of the second blade that are set at 33 degrees, 30 degrees and 27 degrees respectively. On the edge of the second hub side of the second blade, there are mounting posts (1041) corresponding to the mounting groove. The mounting posts of the second blade are inserted into the mounting inlet at one end of the mounting groove and simultaneously inserted into the corresponding stop groove through the track groove of the mounting groove.

5. The variable blade installation angle cooling fan blade according to claim 4, characterized in that... The mounting groove (1031) of the second hub (103) and the corresponding mounting inlet (1032), track groove (1033) and gear groove (1034) are all integrally formed in an "E" shape.

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