Cross-flow fan

Abstract

The utility model provides a cross-flow fan which comprises a shell and an impeller, the shell is provided with an air inlet, an air outlet and a cross-flow air duct communicated with the air inlet and the air outlet, and the impeller is installed in the shell and located in the cross-flow air duct. Wherein a first volute tongue and a second volute tongue are arranged in the cross-flow air duct, the first volute tongue is close to the air inlet, the second volute tongue separates the air inlet from the air outlet, the impeller rotates to drive external airflow to enter from the air inlet, and the external airflow is guided by the first volute tongue and the second volute tongue and exhausted from the air outlet. The included angle between the rotating center of the impeller and the first volute tongue and the included angle between the rotating center of the impeller and the second volute tongue are defined as the impeller wrap angle larger than 220 degrees. Compared with the prior art, the cross-flow fan not only is small in size and low in noise, but also can improve the smoothness of air inlet and air outlet and improve the air volume.

Description

Technical Field

[0001] The utility model relates to a cross-flow fan and belongs to the technical field of fans. Background Art

[0002] At present, the inlet and outlet angles of cross-flow fans on the market are mostly arranged at 90°-180°, and the impeller wrap angle is also mostly arranged at 90°-180°, which makes the fan as a whole larger and is not conducive to saving space. When the fan is applied to products such as clothes drying racks and heaters, the body becomes bloated, making it difficult to achieve an ultra-thin body, and the small air volume leads to average heating effect.

[0003] Therefore, the cross-flow fans on the market are difficult to use in small household appliances or ultra-thin spaces. The impeller angle is too small, which leads to high pressure loss, low air volume, and low total pressure efficiency. There may also be unstable air output and high noise.

[0004] In view of this, it is indeed necessary to propose improvements to the existing cross-flow fans to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a cross-flow fan which is not only small in size and low in noise, but also can improve the smoothness of air inlet and outlet and increase the air volume.

[0006] To achieve the above object, the utility model provides a crossflow fan, comprising:

[0007] The housing is provided with an air inlet, an air outlet, and a cross-flow air duct connecting the air inlet and the air outlet;

[0008] An impeller is installed in the housing and is located in the crossflow duct;

[0009] Among them, a first volute tongue and a second volute tongue are provided in the cross-flow air duct, the first volute tongue is close to the air inlet, and the second volute tongue separates the air inlet and the air outlet. The rotation of the impeller drives the external air flow to enter from the air inlet, and is guided by the first volute tongue and the second volute tongue and discharged from the air outlet. The angle between the rotation center of the impeller and the first volute tongue and the second volute tongue is defined as the impeller wrap angle, and the impeller wrap angle is greater than 220°.

[0010] As a further improvement of the present invention, the cross-flow air duct includes an air inlet area, an air outlet area and an acceleration area connecting the air inlet area and the air outlet area. The air inlet is located in the air inlet area, the air outlet is located in the air outlet area, and the acceleration area forms a spirally expanding structure from the air inlet area toward the air outlet area.

[0011] As a further improvement of the utility model, the acceleration area is provided with an acceleration starting point and an acceleration ending point, the acceleration starting point is close to the air inlet area, the acceleration ending point is close to the air outlet area, and the first volute tongue is arranged at the acceleration starting point.

[0012] As a further improvement of the present invention, the second volute tongue separates the air inlet area and the air outlet area, and makes the air inlet direction in the air inlet area basically parallel to the air outlet direction in the air outlet area.

[0013] As a further improvement of the utility model, the projection points of the impeller's rotation center along the horizontal direction on the two inner walls of the shell are defined as the first intersection and the second intersection respectively, and the projection point of the impeller's rotation center on the top wall of the shell is defined as the third intersection, and the first intersection, the second intersection and the third intersection are all located in the acceleration area.

[0014] As a further improvement of the utility model, the distance from the rotation center of the impeller to the first intersection is defined as the first distance, the distance from the rotation center of the impeller to the third intersection is defined as the second distance, and the distance from the rotation center of the impeller to the second intersection is defined as the third distance. The ratio of the first distance, the second distance and the third distance is 0.7-0.76:0.8-0.85:1.

[0015] As a further improvement of the utility model, the air inlet and the air outlet are located on the same side of the shell and are both rectangular openings, and the width ratio of the air inlet to the air outlet is 2-3:1.

[0016] As a further improvement of the utility model, in the width direction of the air inlet and the air outlet, the rotation center of the impeller is located above the acceleration starting point and the acceleration ending point.

[0017] As a further improvement of the utility model, the ratio of the diameter of the impeller to the height of the casing is 0.45-0.55:1.

[0018] As a further improvement of the utility model, a heating module is installed at the air inlet. The rotation of the impeller drives the external air to enter the cross-flow air duct from the air inlet through the heating module and then be discharged from the air outlet to form a working hot air flow.

[0019] The beneficial effects of the utility model are as follows: the cross-flow fan of the utility model is provided with a first volute tongue and a second volute tongue in the cross-flow air duct, and the first volute tongue is close to the air inlet, and the second volute tongue separates the air inlet and the air outlet, so that the rotation of the impeller drives the external air flow to enter from the air inlet, and is guided by the first volute tongue and the second volute tongue and discharged from the air outlet; at the same time, the angle between the rotation center of the impeller and the first volute tongue and the second volute tongue is defined as the impeller wrap angle, and the impeller wrap angle is set to be greater than 220°, so that the cross-flow fan of the utility model is not only small in size and low in noise, but also can improve the smoothness of air inlet and air outlet, and increase the air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the cross-flow fan of the utility model.

[0021] Figure 2 yes Figure 1 Cross-sectional view of .

[0022] Figure 3 yes Figure 2 Schematic diagram of the impeller wrap angle and wind direction. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] See also Figure 1-Figure 3 As shown, the utility model discloses a crossflow fan 100, including a housing 1 and an impeller 2. The housing 1 is provided with an air inlet 11, an air outlet 12, and a crossflow air duct 13 connecting the air inlet 11 and the air outlet 12. The impeller 2 is installed in the housing 1 and is located in the crossflow air duct 13. The impeller 2 is opposite to the air inlet 11. The crossflow fan 100 of the utility model is not only small in size and low in noise, but also can improve the smoothness of air inlet and air outlet, and increase the air volume.

[0025] Specifically, the air inlet 11 and the air outlet 12 are located on the same side of the shell 1 and are both rectangular openings, so that the shell 1 can only have one side for air inlet and outlet, thus achieving an ultra-small size. It is understandable that the description of the air inlet 11 and the air outlet 12 as rectangles is a preferred description as a non-limiting example and should not be regarded as a specific limitation of the present invention. In other embodiments, the air inlet 11 and the air outlet 12 may also be other regular / irregular shapes, or even any other possible geometric shapes. The cross-flow air duct 13 includes an air inlet area 131, an air outlet area 132, and an acceleration area 133 connecting the air inlet area 131 and the air outlet area 132. The air inlet 11 is located in the air inlet area 131. The air outlet 12 is located in the air outlet area 132. The acceleration area 133 forms a spirally expanding structure from the air inlet area 131 toward the air outlet area 132. As shown in FIG. Figure 2 As shown, the “spiral gradually expanding structure” can be understood as: the cross-sectional area of ​​the acceleration region 133 gradually expands from the air inlet region 131 toward the air outlet region 132 .

[0026] Preferably, the acceleration area 133 is provided with an acceleration starting point a and an acceleration ending point b. The acceleration starting point a is close to the air inlet area 131. The acceleration ending point b is close to the air outlet area 132. It is understandable that the housing 1 can guide the airflow change, and the area between the acceleration starting point a and the acceleration ending point b driven by the impeller 2 to increase the wind speed is the acceleration area 133. In other words, the range of the acceleration area 133 is controlled by the spiral expansion line of the spiral expansion structure. The acceleration starting point a and the acceleration ending point b are the starting point and the ending point of the spiral expansion line.

[0027] A first volute tongue 14 and a second volute tongue 15 are provided in the crossflow air duct 13. The first volute tongue 14 is close to the air inlet 11. The second volute tongue 15 separates the air inlet 11 from the air outlet 12. The width ratio of the air inlet 11 to the air outlet 12 is 2-3:1. In some optional embodiments, the width ratio of the air inlet 11 to the air outlet 12 can also be 2.3-2.7:1.

[0028] The rotation of the impeller 2 drives the external airflow to enter from the air inlet 11, and is guided by the first volute tongue 14 and the second volute tongue 15, and discharged from the air outlet 12. The angle between the rotation center of the impeller 2 and the first volute tongue 14 and the second volute tongue 15 is defined as the impeller wrap angle α. The impeller wrap angle α is greater than 220°, but not more than 250°. Optionally, the impeller wrap angle α can be 225°, 230°, 235°, 240°, 245° or 250°, etc. In other words, the impeller wrap angle can be any angle between 220° and 250°.

[0029] The first volute tongue 14 is arranged at the acceleration starting point a to prevent the airflow from flowing back. The second volute tongue 15 separates the air inlet area 131 and the air outlet area 132, and makes the air inlet direction in the air inlet area 131 substantially parallel to the air outlet direction in the air outlet area 132. Preferably, the width ratio of the air inlet 11 and the air outlet 12 is optimally 2.67:1, at which time the structure of the crossflow air duct 13 is more reasonable, and the air outlet distance of the compressed air at the air outlet 12 can be increased. The impeller wrap angle α is optimally 250°. When the crossflow fan 100 is working, an eccentric vortex is generated near the impeller 2. Based on the results of fluid simulation, when the impeller wrap angle α is 250°, the eccentric vortex is the smallest. At this time, the air outlet efficiency of the crossflow fan 100 is the highest, the crossflow fan 100 can obtain a higher air volume noise ratio, and the air outlet is more stable. At the same time, under the restriction of the impeller wrap angle α and the second volute tongue 15 , the first volute tongue 14 also has an optimal position, and at this time, the air intake of the cross-flow blower 100 is smooth.

[0030] In this embodiment, the air inlet 11 and the air outlet 12 are both located at the bottom of the shell 1. Optionally, the shell 1 includes a panel 111 and two side panels 112 connected to the left and right sides of the panel 111. The cross-section of the panel 111 is U-shaped, that is, the panel 111 is provided with an opening (not shown). The cross-section of the second volute tongue is also U-shaped. The second volute tongue 15 is fixed between the two side panels 112 and divides the opening into the air inlet 11 and the air outlet 12. The structure is simple and the assembly is convenient and quick. Preferably, the first volute tongue 14 is integrally arranged with the panel 111. The external airflow enters from the air inlet 11, and under the guidance of the first volute tongue 14, it will flow along the cross-flow duct 13, and no backflow will occur in the air inlet area 131.

[0031] In the width direction of the air inlet 11 and the air outlet 12, the rotation center of the impeller 2 is located above the acceleration starting point a and the acceleration ending point b. Of course, in other directions, such as the horizontal direction and the vertical direction of the air inlet and outlet, the rotation center of the impeller 2 is located above the acceleration starting point a and the acceleration ending point b. The projection points of the rotation center of the impeller 2 on the two inner walls of the shell 1 along the horizontal direction are defined as the first intersection 21 and the second intersection 22 respectively. The projection point of the rotation center of the impeller 2 on the top wall of the shell 1 is defined as the third intersection 23. The first intersection 21, the second intersection 22 and the third intersection 23 are all located in the acceleration area 133. The "shell 1" mentioned here is preferably the enclosure 111.

[0032] The distance from the rotation center of the impeller 2 to the first intersection 21 is defined as the first distance. The distance from the rotation center of the impeller 2 to the third intersection 23 is defined as the second distance. The distance from the rotation center of the impeller 2 to the second intersection 22 is defined as the third distance. The ratio of the first distance, the second distance and the third distance is 0.7-0.76:0.8-0.85:1. Preferably, the ratio of the first distance, the second distance and the third distance is 0.74:0.81:1. At this time, based on the results of the fluid simulation, the crossflow fan 100 can increase the air volume and air velocity, thereby also increasing the air outlet distance.

[0033] The ratio of the diameter of the impeller 2 to the height of the housing 1 is 0.45-0.55:1. Optionally, the ratio of the diameter of the impeller 2 to the height of the housing 1 is 0.5:1, so as to achieve the minimum size while ensuring a certain air output. For example, in a specific embodiment, based on the height of the crossflow fan 100 being 50 mm and the width being 40 mm, the diameter of the impeller 2 can be 24 mm, 25 mm, 27 mm, etc. Preferably, when the diameter of the impeller 2 is 27 mm, the ratio of the height of the crossflow fan 100 to the diameter of the impeller 2 is 1.85, and the ratio of the width of the crossflow fan 100 to the diameter of the impeller 2 is 1.48. At this time, not only the air output efficiency is high, but also the size of the crossflow fan 100 is the smallest.

[0034] The crossflow fan 100 can be applied to clothes drying machines and heaters. In this case, a heating module 16 can be installed at the air inlet 11 according to actual needs. Then, the impeller 2 rotates to drive the external air from the air inlet 11 through the heating module 16 into the crossflow air duct 13, and then is discharged from the air outlet 12 to form a working hot air flow. The bottom end of the heating module 16 is flush with the air outlet 12, so that the air inlet 11 and the air outlet 12 are flush, making the appearance of the crossflow fan 100 more complete.

[0035] In summary, the cross-flow fan 100 of the present invention is provided by arranging the air inlet 11 and the air outlet 12 on the same side of the housing 1, and also by arranging the first volute tongue 14 and the second volute tongue 15 in the cross-flow air duct 13, and the first volute tongue 14 is close to the air inlet 11, and the second volute tongue 15 separates the air inlet 11 and the air outlet 12, so that the impeller 2 rotates to drive the external air flow to enter from the air inlet 11, and is guided by the first volute tongue 14 and the second volute tongue 15, and discharged from the air outlet 12. At the same time, the angle between the rotation center of the impeller 2 and the first volute tongue 14 and the second volute tongue 15 is defined as the impeller wrap angle α, and the impeller wrap angle α is greater than 220°, then the cross-flow fan 100 of the present invention is not only small in size and low in noise, but also can improve the fluency of air inlet and outlet, and increase the air volume.

[0036] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. A crossflow fan, characterized in that: include: A housing (1) is provided with an air inlet (11), an air outlet (12), and a cross-flow air duct (13) connecting the air inlet (11) and the air outlet (12); An impeller (2) is installed in the housing (1) and is located in the crossflow air duct (13); The cross-flow air duct (13) is provided with a first volute tongue (14) and a second volute tongue (15), the first volute tongue (14) is close to the air inlet (11), and the second volute tongue (15) separates the air inlet (11) and the air outlet (12); the impeller (2) rotates to drive external airflow to enter from the air inlet (11), and is guided by the first volute tongue (14) and the second volute tongue (15) and discharged from the air outlet (12); the angle between the rotation center of the impeller (2) and the first volute tongue (14) and the second volute tongue (15) is defined as the impeller wrap angle, and the impeller wrap angle is greater than 220°.

2. The crossflow fan according to claim 1, characterized in that: The cross-flow air duct (13) comprises an air inlet area (131), an air outlet area (132), and an acceleration area (133) connecting the air inlet area (131) and the air outlet area (132); the air inlet (11) is located in the air inlet area (131), the air outlet (12) is located in the air outlet area (132), and the acceleration area (133) forms a spirally expanding structure from the air inlet area (131) toward the air outlet area (132).

3. The crossflow fan according to claim 2, characterized in that: The acceleration area (133) is provided with an acceleration starting point and an acceleration ending point, the acceleration starting point is close to the air inlet area (131), the acceleration ending point is close to the air outlet area (132), and the first volute tongue (14) is arranged at the acceleration starting point.

4. The crossflow fan according to claim 2, characterized in that: The second volute tongue (15) separates the air inlet area (131) and the air outlet area (132), and makes the air inlet direction in the air inlet area (131) and the air outlet direction in the air outlet area (132) substantially parallel.

5. The crossflow fan according to claim 2, characterized in that: The projection points of the rotation center of the impeller (2) on the two inner side walls of the shell (1) in the horizontal direction are defined as a first intersection point (21) and a second intersection point (22), respectively; the projection point of the rotation center of the impeller (2) on the top wall of the shell (1) is defined as a third intersection point (23); and the first intersection point (21), the second intersection point (22) and the third intersection point (23) are all located within the acceleration region (133).

6. The cross flow fan according to claim 5, characterized in that: The distance from the rotation center of the impeller (2) to the first intersection (21) is defined as a first distance, the distance from the rotation center of the impeller (2) to the third intersection (23) is defined as a second distance, and the distance from the rotation center of the impeller (2) to the second intersection (22) is defined as a third distance, and the ratio of the first distance, the second distance, and the third distance is 0.7-0.76:0.8-0.85:

1.

7. The crossflow fan according to claim 3, characterized in that: The air inlet (11) and the air outlet (12) are located on the same side of the shell (1) and are both rectangular openings; the width ratio of the air inlet (11) to the air outlet (12) is 2-3:

1.

8. The cross flow fan according to claim 7, characterized in that: In the width direction of the air inlet (11) and the air outlet (12), the rotation center of the impeller (2) is located above the acceleration starting point and the acceleration ending point.

9. The crossflow fan according to claim 1, characterized in that: The ratio of the diameter of the impeller (2) to the height of the casing (1) is 0.45-0.55:

1.

10. The cross flow fan according to claim 1, characterized in that: A heating module (16) is installed at the air inlet (11), and the impeller (2) rotates to drive external air from the air inlet (11) through the heating module (16) into the cross-flow air duct (13), and then is discharged from the air outlet (12), forming a working hot air flow.

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