Double-blade circulating fan

Abstract

The utility model relates to a double-fan-blade circulating fan which comprises a motor, a motor shaft is arranged on the motor, a rear fan blade close to the motor and a front fan blade far away from the motor are sequentially arranged on the motor shaft in a sleeved mode, and the motor shaft is in transmission connection with the rear fan blade and the front fan blade. The diameter of the rear fan blade is smaller than that of the front fan blade; according to the utility model, the rear fan blades with smaller diameters are arranged to scatter the airflow blown by the front fan blades and scatter the large airflow blown by the front fan blades into small airflow, so that the wind power is more uniform and softer, the problem of weak wind power at the center of the fan blades is solved, and the service life of the fan is prolonged. The discomfort of the user during air blowing and cooling is weakened, and the use experience of the user is improved.

Description

Technical Field

[0001] This utility model relates to the field of circulating fan technology, and in particular to a dual-blade circulating fan. Background Technology

[0002] Air circulators blow air over a longer distance with better directionality. This results in a larger contact area with the surrounding air, dispersing the air and encouraging more air to participate in indoor air circulation, thus accelerating indoor air flow and balancing the indoor temperature.

[0003] However, the rotating blades of an air circulator fan blow air out in a vortex, and the wind force at the tip of the blade is much greater than that at the center. This can cause discomfort for users after prolonged use. If the airflow could be mimicked to make the wind distribution more even, this discomfort could be reduced, thereby improving the user experience. Utility Model Content

[0004] In view of the current state of the prior art, the technical problem to be solved by this utility model is to provide a dual-blade circulating fan that makes the airflow from the circulating fan more uniform and gentle, so as to reduce the discomfort of users when cooling off.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a dual-blade circulating fan, including a motor, a motor shaft, a rear fan blade close to the motor and a front fan blade away from the motor are sequentially sleeved on the motor shaft, the motor shaft is connected to the rear fan blade and the front fan blade in a transmission connection, and the diameter of the rear fan blade is smaller than the diameter of the front fan blade.

[0006] Furthermore, an air guide tube is fitted onto the rear fan blade and the front fan blade, a rear mesh cover is fitted onto the air guide tube, a motor mesh cover fitted onto the motor is provided at one end of the rear mesh cover, an annular protective plate is provided at the other end of the rear mesh cover, and a front mesh cover is provided at the end of the annular protective plate away from the rear mesh cover.

[0007] Furthermore, the front blade is provided with a plurality of front blades at equal intervals, and the rear blade is provided with a number of rear blades at equal intervals, the same number as the number of front blades. The intervals between the rear blades are provided with abutment grooves for the edges of the front blades to abut against each other.

[0008] Furthermore, the front fan blade has a protruding retaining ring, and the rear fan blade has a mating cavity for the retaining ring to be engaged.

[0009] Furthermore, the inner ring of the mating cavity is provided with a plurality of trapezoidal grooves, and the retaining ring mates with the trapezoidal grooves.

[0010] Furthermore, the motor shaft is a flat shaft, the front fan blade is provided with a first flat hole for the motor shaft to mate with, and the rear fan blade is provided with a second flat hole for the motor shaft to mate with.

[0011] Furthermore, a retaining ring is protruding on the motor shaft, and a limiting surface is provided on the rear fan blade for the retaining ring to abut against.

[0012] Furthermore, the air guide duct includes an air outlet and an air inlet. The air outlet is located on the side of the air guide duct closer to the annular protective plate, and the air inlet is located on the side of the air guide duct away from the annular protective plate. The diameter of the air outlet is smaller than the diameter of the air inlet.

[0013] Compared with the prior art, the advantages of this utility model are as follows: This utility model disperses the airflow blown out by the front fan blade by setting the rear fan blade with a smaller diameter, breaking the large airflow blown out by the front fan blade into smaller airflows, thereby making the wind force of this utility model more uniform and softer, and solving the problem of weak wind force in the center of the fan blade, so as to reduce the discomfort of users when blowing wind and cooling, and improve the user experience. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the assembly of the fan blade motor of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of this utility model;

[0016] Figure 3 This is an exploded view of the present invention;

[0017] Figure 4 for Figure 3 Enlarged view of A in the middle;

[0018] Figure 5 This is a cross-sectional view of the air guide duct of this utility model, parallel to its axis.

[0019] Figure 6 This is a schematic diagram of the front windshield of this utility model;

[0020] Figure 7 This is a structural schematic diagram of one side of the rear fan blade of this utility model;

[0021] Figure 8 This is a schematic diagram of the structure of the other side of the rear fan blade of this utility model;

[0022] As shown in the figure: 1. Front mesh cover; 2. Rear mesh cover; 3. Motor mesh cover; 4. Motor; 4.1 Motor shaft; 4.2 Snap ring; 5. Air guide tube; 5.1 Air outlet; 5.2 Air inlet; 6. Front fan blade; 6.1 Front blade; 6.2 Snap ring; 6.3 First flat hole; 7. Rear fan blade; 7.1 Rear blade; 7.2 Abutment groove; 7.3 Mating cavity; 7.4 Trapezoidal groove; 7.5 Second flat hole; 7.6 Limiting surface; 8. Annular guard plate. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] like Figure 1-8 As shown, a dual-blade circulating fan includes a motor 4, a motor shaft 4.1 on the motor 4, and a rear fan blade 7 close to the motor 4 and a front fan blade 6 away from the motor 4 sequentially mounted on the motor shaft 4.1. The motor shaft 4.1 is connected to the rear fan blade 7 and the front fan blade 6 in a driving connection, and the diameter of the rear fan blade 7 is smaller than the diameter of the front fan blade 6. This invention also disperses the airflow blown out by the front fan blade 6 by setting the smaller diameter rear fan blade 7, breaking the large airflow blown out by the front fan blade 6 into smaller airflow pieces, thereby making the wind force more uniform and softer, and solving the problem of weak wind force in the center of the fan blades. This reduces the discomfort of users when blowing wind and cooling, thereby improving the user experience.

[0029] Preferably, a guide tube 5 is fitted onto the rear fan blade 7 and the front fan blade 6, and a rear mesh cover 2 is fitted onto the guide tube 5. One end of the rear mesh cover 2 is provided with a motor mesh cover 3 fitted onto the motor 4, and the other end of the rear mesh cover 2 is provided with an annular guard plate 8. The end of the annular guard plate 8 away from the rear mesh cover 2 is provided with a front mesh cover 1. By setting the guide tube 5, this utility model makes the wind less likely to spread, thereby making the wind more concentrated and able to blow farther, thus accelerating the circulation of indoor air.

[0030] Preferably, the front fan blade 6 is provided with a plurality of front blades 6.1 at equal intervals, and the rear fan blade 7 is provided with a number of rear blades 7.1 at equal intervals, the same number as the front blades 6.1. The rear blades 7.1 are provided with abutment grooves 7.2 in the intervals for the edges of the front blades 6.1 to abut against each other; thereby, the front fan blade 6 and the rear fan blade 7 are staggered, so that they will not interfere with each other during movement. As one embodiment, there are 3 front blades 6.1. Of course, the number of front blades 6.1 can be increased or decreased according to the actual use requirements under different conditions. For example, when a large-diameter fan is required, as another embodiment, there are 4 front blades 6.1.

[0031] Preferably, the front fan blade 6 has a protruding retaining ring 6.2, and the rear fan blade 7 has a mating cavity 7.3 for the retaining ring 6.2 to be engaged. The mating of the retaining ring 6.2 and the mating cavity 7.3 can help the front fan blade 6 and the rear fan blade 7 to be positioned relative to each other. As another embodiment, the diameter of the retaining ring 6.2 can be slightly larger than the diameter of the mating cavity 7.3, thereby achieving an interference fit between the two and making the fit between the front fan blade 6 and the rear fan blade 7 more secure.

[0032] Preferably, the inner ring of the mating cavity 7.3 is provided with a plurality of trapezoidal grooves 7.4, and the retaining ring 6.2 mates with the trapezoidal grooves 7.4. Because the groove opening size of the trapezoidal groove 7.4 is larger than the groove bottom, the trapezoidal groove 7.4 and the retaining ring 6.2 are easier to mate, making the production and assembly process easier. As an embodiment, there are 6 trapezoidal grooves 7.4.

[0033] Preferably, the motor shaft 4.1 is a flat shaft, the front fan blade 6 is provided with a first flat hole 6.3 for the motor shaft 4.1 to mate with, and the rear fan blade 7 is provided with a second flat hole 7.5 for the motor shaft 4.1 to mate with. When the motor shaft 4.1 rotates, it drives the front fan blade 6 and the rear fan blade 7 to rotate synchronously, thereby realizing the transmission connection between the motor shaft 4.1 and the front fan blade 6 and the rear fan blade 7. At the same time, setting the motor shaft 4.1 as a flat shaft can also restrict the assembly position of the front fan blade 6 and the rear fan blade 7, further ensuring that the positions of the front fan blade 6 and the rear fan blade 7 are staggered to prevent interference between their movements.

[0034] Preferably, a retaining ring 4.2 is protruding on the motor shaft 4.1, and a limiting surface 7.6 is provided on the rear fan blade 7 for the retaining ring 4.2 to abut against, which can prevent the rear fan blade 7 from sliding, thereby avoiding collision with the rear mesh cover 2 and reducing safety hazards.

[0035] Preferably, the air guide duct 5 includes an air outlet 5.1 and an air inlet 5.2. The air outlet 5.1 is located on the side of the air guide duct 5 near the annular protective plate 8, and the air inlet 5.2 is located on the side of the air guide duct 5 away from the annular protective plate 8. The diameter of the air outlet 5.1 is smaller than the diameter of the air inlet 5.2. This allows air to enter from a large space into a small space, thereby concentrating the air and making the wind force blown by this invention greater and farther.

[0036] When using this utility model, first energize the motor 4 to rotate the motor shaft 4.1. Because the first flat hole 6.3 and the second flat hole 7.5 are both in transmission cooperation with the motor shaft 4.1, which is set as a flat shaft, the motor shaft 4.1 will drive the front fan blade 6 and the rear fan blade 7 to rotate synchronously. During the rotation, because the edge of the front blade 6.1 always abuts in the abutment groove 7.2, and because the abutment groove 7.2 is set in the interval of the rear blade 7.1, it is further ensured that the front fan blade 6 and the rear fan blade 7 rotate synchronously and will not interfere with each other. The retaining ring 6.2 is inserted into the mating cavity 7.3 and the trapezoidal groove 7.4, making the fit between the front fan blade 6 and the rear fan blade 7 more secure. Through the abutment of the limiting surface 7.6 and the retaining spring 4.2, the rear fan blade 7 can be prevented from colliding with the rear mesh cover 2.

[0037] During the movement of the front fan blade 6 and the rear fan blade 7, air is drawn from the air inlet 5.2 of the air guide duct 5 into the air outlet 5.1, thus concentrating the air and making the wind force of this invention stronger and the blowing distance farther. The smaller diameter rear fan blade 7 disperses the airflow blown out by the front fan blade 6, breaking the large airflow into smaller airflow, thus making the wind force of this invention more uniform and gentle. Furthermore, the front mesh cover 1, the rear mesh cover 2, and the motor mesh cover 3 prevent foreign objects from entering and interfering with the movement of the front fan blade 6 and the rear fan blade 7, thereby ensuring the safe use of the product and providing users with a good user experience.

[0038] Compared to traditional air circulators, this invention, by incorporating the air guide duct 5, prevents airflow from easily spreading and concentrates the air, resulting in a more focused and farther-reaching airflow that accelerates indoor air circulation. Furthermore, by using the smaller-diameter rear fan blade 7, this invention disperses the airflow from the front fan blade 6, breaking down large airflow segments into smaller ones. This makes the airflow more even and gentle, and solves the problem of weak airflow at the center of the fan blades, reducing user discomfort during cooling and improving the user experience.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A dual-blade circulation fan, characterized by comprising: The motor (4) is provided with a motor shaft (4.1), the rear fan blade (7) and the front fan blade (6) are sequentially sleeved on the motor shaft (4.1), the motor shaft (4.1) is in transmission connection with the rear fan blade (7) and the front fan blade (6), and the diameter of the rear fan blade (7) is smaller than that of the front fan blade (6).

2. The dual impeller circulation fan according to claim 1, wherein The rear fan blade (7) and the front fan blade (6) are sleeved with a wind guide cylinder (5), the rear fan blade (7) and the front fan blade (6) are sleeved with a rear mesh cover (2), one end of the rear mesh cover (2) is provided with a motor mesh cover (3) sleeved on the motor (4), the other end of the rear mesh cover (2) is provided with an annular guard plate (8), and the annular guard plate (8) is provided with a front mesh cover (1) away from the rear mesh cover (2).

3. The dual impeller circulation fan according to claim 1, wherein A plurality of front blades (6.1) are annularly arranged at equal intervals on the front fan blade (6), and a plurality of rear blades (7.1) are annularly arranged at equal intervals on the rear fan blade (7), the number of the rear blades (7.1) being the same as that of the front blades (6.1), and a abutting groove (7.2) for the edge of the front blade (6.1) to abut is arranged in the interval of the rear blade (7.1).

4. The dual impeller circulation fan of claim 1, wherein, The front fan blade (6) is provided with a snap ring (6.2), and the rear fan blade (7) is provided with a matching cavity (7.3) for the snap ring (6.2) to be clamped into.

5. The dual impeller circulation fan according to claim 4, wherein A plurality of trapezoidal grooves (7.4) are annularly arranged in the matching cavity (7.3), and the snap ring (6.2) is matched with the trapezoidal grooves (7.4).

6. The dual impeller circulation fan of claim 1, wherein, The motor shaft (4.1) is a flat shaft, the front fan blade (6) is provided with a first flat hole (6.3) matched with the motor shaft (4.1), and the rear fan blade (7) is provided with a second flat hole (7.5) matched with the motor shaft (4.1).

7. The dual impeller circulation fan of claim 1, wherein, The motor shaft (4.1) is provided with a clamping spring (4.2), and the rear fan blade (7) is provided with a limiting surface (7.6) for the clamping spring (4.2) to abut.

8. The dual impeller circulation fan of claim 2, wherein, The wind guide cylinder (5) comprises an air outlet (5.1) and an air inlet (5.2), the air outlet (5.1) is located on one side of the wind guide cylinder (5) close to the annular guard plate (8), the air inlet (5.2) is located on the other side of the wind guide cylinder (5) away from the annular guard plate (8), and the diameter of the air outlet (5.1) is smaller than that of the air inlet (5.2).

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