Impeller, mixed flow fan and bath heater

Abstract

The invention provides an impeller, a mixed flow fan and a bath heater, and the impeller comprises a wheel cover which comprises an inner cavity penetrating along the axis; the wheel hub is arranged in the wheel cover, a flow channel is formed between the wheel hub and the wheel cover, and the flow channel is provided with an inlet end and an outlet end which are oppositely arranged; the plurality of blades are uniformly arranged in the flow channel, are connected between the inner surface of the wheel cover and the outer surface of the wheel hub, and are used for uniformly dividing the flow channel; wherein the blade is arranged in a twisted mode and comprises a front edge located on one side of the inlet end and a rear edge located on one side of the outlet end, the rear edge is provided with a sawtooth structure, the flow channel is provided with a through-flow area, and the through-flow area is gradually increased from the inlet end to the outlet end. Compared with the prior art, the impeller achieves the purposes of being large in air volume, high in pressure and low in noise in the using process, and the working efficiency of the mixed flow fan is effectively improved.

Description

Technical Field

[0001] The present invention relates to an impeller, a mixed-flow fan and a bathroom heater, belonging to the technical field of household appliances. Background Art

[0002] With the improvement of people's living standards, the demand for ventilation equipment is increasing, especially in the field of household appliances, where fans are more widely used. A bathroom heater is an important ventilation equipment, but the fans used in bathroom heaters often have problems such as small air delivery volume, large delivery loss and high noise, which reduces the user experience.

[0003] In view of this, it is necessary to improve the existing impeller, mixed-flow fan and bathroom heater to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an impeller that can achieve the purpose of large air volume, high pressure and low noise during use, and effectively improve the working efficiency of the mixed-flow fan.

[0005] To achieve the above purpose, the present invention provides an impeller, including:

[0006] A hub cover, including an inner cavity that penetrates along the axis;

[0007] A hub, disposed inside the hub cover, a flow passage is formed between the hub and the hub cover, and the flow passage has an inlet end and an outlet end disposed opposite to each other; and

[0008] A plurality of blades, evenly disposed in the flow passage, and connected between the inner surface of the hub cover and the outer surface of the hub, evenly dividing the flow passage;

[0009] Wherein, the blades are twisted, and include a leading edge on one side of the inlet end and a trailing edge on one side of the outlet end, the trailing edge is provided with a serrated structure, the flow passage has a flow area, and the flow area gradually increases from the inlet end to the outlet end.

[0010] As a further improvement of the present invention, the blade further includes a blade root connected to the outer surface of the hub and extending along the outer surface of the hub, and a blade tip disposed opposite to the blade root, the blade tip is connected to the inner surface of the hub cover, and both the blade root and the blade tip are gradually offset.

[0011] As a further improvement of the present invention, the projection length of the blade root on the axis of the hub cover is 51.0a mm to 53.0a mm, and the projection curve length in a plane perpendicular to the axis of the hub cover is 53.0a mm to 56.0a mm, where a is a scale and a>0.

[0012] As a further improvement of the present invention, the projection length of the blade tip on the axis of the wheel cover is 45.0a mm to 47.0a mm, and the projection curve length in the plane perpendicular to the axis of the wheel cover is 72.0a mm to 77.0a mm, where a is the scale factor and a > 0.

[0013] As a further improvement of the present invention, the projection of the leading edge on the plane perpendicular to the axis of the wheel cover is a curve concave towards the trailing edge, and the outer diameter of the leading edge is 35.0a mm to 37.0a mm, the inner diameter is 5.0a mm to 5.5a mm, the outer diameter of the trailing edge is 62.0a mm to 66.0a mm, and the inner diameter is 51.0a mm to 54.0a mm, where a is the scale factor and a > 0.

[0014] As a further improvement of the present invention, the projection length of the leading edge on the axis of the wheel cover is 3.0a mm to 3.5a mm, and the projection curve length in the plane perpendicular to the axis of the wheel cover is 30.0a mm to 32.0a mm; the distance between the two end points of the projection curve of the trailing edge in the plane perpendicular to the axis of the wheel cover is 10.0a mm to 14.0a mm, where a is the scale factor and a > 0.

[0015] As a further improvement of the present invention, the hub is conically arranged, the wheel cover is sleeved on the outside of the hub, and the twisting direction of the blade is opposite to the rotation direction of the impeller.

[0016] As a further improvement of the present invention, the flow passage is also provided with an inlet area and an outlet area, the inlet area is 3900a 2 mm 2 ~4100a 2 mm 2 , and the outlet area is 5600a 2 mm 2 ~5800a 2 mm 2 , where a is the scale factor and a > 0.

[0017] Another object of the present invention is to provide a mixed-flow fan having the above impeller.

[0018] To achieve the above object, the present invention provides a mixed-flow fan including the above impeller.

[0019] Another object of the present invention is to provide a bathroom heater having the above mixed-flow fan.

[0020] To achieve the above object, the present invention provides a bathroom heater, including the above-mentioned mixed-flow fan. The bathroom heater is provided with an air inlet and an air outlet. The mixed-flow fan is arranged close to the air inlet, and the air outlet is arranged in a long strip shape.

[0021] The beneficial effects of the present invention are as follows: On the one hand, the flow passage formed between the hub and the wheel cover is set to have a gradually increasing flow area from the inlet end to the outlet end. On the other hand, the flow passage is evenly divided by a plurality of blades, and a serrated structure is arranged at the trailing edge of the blades. Therefore, the impeller of the present invention can achieve the purpose of large air volume, high pressure and low noise during use, effectively improving the working efficiency of the mixed-flow fan. Description of the Drawings

[0022] Figure 1 is a three-dimensional structure schematic diagram of the bathroom heater of the present invention.

[0023] Figure 2 is a three-dimensional structure schematic diagram of the impeller of the present invention.

[0024] Figure 3 is Figure 2 a three-dimensional structure schematic diagram from another angle of

[0025] Figure 4 is Figure 2 a three-dimensional structure schematic diagram from another angle of

[0026] Figure 5 is Figure 2 a sectional view of the impeller in

[0027] Figure 6 is Figure 2 a three-dimensional assembly drawing of the blade and the hub in

[0028] Figure 7 is Figure 5 a three-dimensional structure schematic diagram from another angle of

[0029] Figure 8 is Figure 2 a three-dimensional structure schematic diagram of the blade in Detailed Embodiments

[0030] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0031] Please refer to Figure 1As shown in the figure, the present invention discloses a bathroom heater 300, which includes a bathroom heater box body 4, a bathroom heater box cover 5 and a mixed-flow fan 200. The bathroom heater 300 is further provided with an air inlet 6 and an air outlet 7. The air inlet 6 is located at one end of the bathroom heater box body 4, and the air outlet 7 is located on the bathroom heater box cover 5. The mixed-flow fan 200 is arranged close to the air inlet 6 and is installed in the bathroom heater box body 4. The air outlet 7 is arranged in a long strip shape, which helps to increase the blowing range and heating experience of the bathroom heater 300. The bathroom heater 300 of the present invention can effectively increase the air volume and air pressure of the whole machine and improve the user experience.

[0032] As Figures 2 - 8 shown, the mixed-flow fan 200 includes an impeller 100. The impeller 100 includes: a wheel cover 1, which includes an inner cavity (not labeled) penetrating along the axis; a hub 2, which is arranged inside the wheel cover 1. A flow channel 21 is formed between the hub 2 and the wheel cover 1, and the flow channel 21 has an inlet end (not labeled) and an outlet end (not labeled) arranged opposite to each other. The inlet end is close to the air inlet 6 of the bathroom heater 300, and the outlet end is far from the air inlet 6 of the bathroom heater 300; and a plurality of blades 3, which are evenly arranged in the flow channel 21 and are connected between the inner surface of the wheel cover 1 and the outer surface of the hub 2, evenly dividing the flow channel 21. Compared with a common fan, the mixed-flow fan 200 of the present invention has a large air volume, a high pressure and a low noise.

[0033] Further, the blades 3 are twisted and include a leading edge 31 on one side of the inlet end and a trailing edge 32 on one side of the outlet end. The trailing edge 32 is provided with a serrated structure 35 for noise reduction. The blade 3 further includes a blade root 33 connected to the outer surface of the hub 2 and extending along the outer surface of the hub 2, and a blade tip 34 arranged opposite to the blade root 33. The blade tip 34 is connected to the inner surface of the wheel cover 1. The blades 3 are twisted to form a three-dimensional curved surface structure, which can improve the working efficiency of the mixed-flow fan 200. The blade root 33 and the blade tip 34 are both gradually offset, so that the blades 3 are all gradually inclined towards the same side of the hub 2. In this embodiment, the number of the blades 3 is nine, and the nine blades 3 evenly divide the flow channel 21 into nine parts. The nine blades 3 have the same inclination direction. In other embodiments, the number of the blades 3 can be determined according to actual situations and is not limited herein.

[0034] The projections of the blade root 33 and the blade tip 34 on a plane perpendicular to the axis of the wheel cover 1 are curves concave inward in the rotation direction of the impeller 100. The projection length of the blade root 33 on the axis of the wheel cover 1 is 51.0a mm to 53.0a mm, and the projection curve length in the plane perpendicular to the axis of the wheel cover 1 is 53.0a mm to 56.0a mm, where a is the scale factor and a > 0. The projection length of the blade tip 34 on the axis of the wheel cover 1 is 45.0a mm to 47.0a mm, and the projection curve length in the plane perpendicular to the axis of the wheel cover 1 is 72.0a mm to 77.0a mm, where a is the scale factor and a > 0.

[0035] The projection of the leading edge 31 on a plane perpendicular to the axis of the wheel cover 1 is a curve concave inward toward the trailing edge 32. The outer diameter of the leading edge 31 is 35.0a mm to 37.0a mm, and the inner diameter is 5.0a mm to 5.5a mm. The outer diameter of the trailing edge 32 is 62.0a mm to 66.0a mm, and the inner diameter is 51.0a mm to 54.0a mm, where a is the scale factor and a > 0. The projection length of the leading edge 31 on the axis of the wheel cover 1 is 3.0a mm to 3.5a mm, and the projection curve length in the plane perpendicular to the axis of the wheel cover 1 is 30.0a mm to 32.0a mm. The distance between the two end points of the projection curve of the trailing edge 32 in the plane perpendicular to the axis of the wheel cover 1 is 10.0a mm to 14.0a mm, where a is the scale factor and a > 0.

[0036] Specifically, in this embodiment, the blade 3 is designed by parameters such as the blade root 33, the blade tip 34, the leading edge 31, the trailing edge 32, and the inner and outer diameters of the leading edge 31 and the trailing edge 32. That is, the projection lengths of the blade root 33 and the blade tip 34 on the axis of the wheel cover 1 and the projection curve lengths in the plane perpendicular to the axis of the wheel cover 1 are defined. At the same time, the inner and outer diameters of the leading edge 31 and the projection lengths of the leading edge 31 on the axis of the wheel cover 1 and the projection curve lengths in the plane perpendicular to the axis of the wheel cover 1 are defined. The blade 3 has been defined, and the parameters of the trailing edge 32 can thus be obtained.

[0037] Specifically, the hub 2 is conically arranged, the wheel cover 1 is sleeved outside the hub 2, the hub 2 is located inside the inner cavity of the wheel cover 1, the hub 2 and the wheel cover 1 are connected by blades 3. One end of the hub 2 near the inlet end is provided with a fixing post 22. One end of the fixing post 22 extends out of the leading edge 31 of the blade 3 into the inner cavity, and the other end extends into the interior of the hub 2. There are a plurality of rib positions 23 connecting between the fixing post 22 and the inner wall of the hub 2 to increase the firmness of the connection between the fixing post 22 and the hub 2, and further increase the stability of the impeller 100 during use. The fixing post 22 is provided with a through positioning hole 221. The fixing post 22 is used to cooperate and position with a motor (not shown). The twisting direction of the blade 3 is opposite to the rotation direction of the impeller 100. In this embodiment, the impeller 100 rotates counterclockwise and the blade 3 is twisted clockwise, which can further improve the air intake smoothness, gradually guide the airflow in the flow channel 21 and then flow out obliquely backward, reducing the flow loss.

[0038] Further, the flow channel 21 has a flow-through area, and the flow-through area gradually increases from the inlet end to the outlet end. The flow channel 21 is also provided with an inlet area and an outlet area. The inlet area is located at the inlet end, and the outlet area is located at the outlet end. The inlet area is 3900a 2 mm 2 ~4100a 2 mm 2 , and the outlet area is 5600a 2 mm 2 ~5800a 2 mm 2 where a is a scale and a > 0. The flow channel 21 is designed by parameters such as the flow-through area, the inlet area, and the outlet area.

[0039] In summary, in the present invention, the hub 2 is arranged inside the wheel cover 1 to form a flow channel 21 with a relatively arranged inlet end and outlet end between the hub 2 and the wheel cover 1, and the flow channel 21 is provided with a flow-through area that gradually increases from the inlet end to the outlet end. At the same time, a plurality of blades 3 are evenly arranged in the flow channel 21 to evenly divide the flow channel 21, and the blades 3 are twisted, and a sawtooth structure 35 is arranged at the trailing edge 32 of the blade 3. Compared with the prior art, the impeller 100 of the present invention achieves the purposes of large air volume, high pressure, and low noise during use, effectively improving the working efficiency of the mixed-flow fan.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An impeller, characterized in that, Comprising: A wheel cover (1), including an inner cavity penetrating along the axis; A wheel hub (2), arranged inside the wheel cover (1), a flow channel (21) is formed between the wheel hub (2) and the wheel cover (1), and the flow channel (21) has an inlet end and an outlet end arranged opposite to each other; And A plurality of blades (3), evenly arranged in the flow channel (21), and connected between the inner surface of the wheel cover (1) and the outer surface of the wheel hub (2), evenly dividing the flow channel (21); Wherein, the blades (3) are twisted, and include a leading edge (31) on one side of the inlet end and a trailing edge (32) on one side of the outlet end, the trailing edge (32) is provided with a serrated structure (35), the flow channel (21) has a flow-through area, and the flow-through area gradually increases from the inlet end to the outlet end.

2. The impeller according to claim 1, wherein: The blade (3) further includes a blade root (33) connected to the outer surface of the wheel hub (2) and extending along the outer surface of the wheel hub (2), and a blade tip (34) arranged opposite to the blade root (33), the blade tip (34) is connected to the inner surface of the wheel cover (1), and both the blade root (33) and the blade tip (34) are gradually offset.

3. The impeller according to claim 2, wherein: The projected length of the blade root (33) on the axis of the wheel cover (1) is 51.0a mm to 53.0a mm, and the projected curve length in a plane perpendicular to the axis of the wheel cover (1) is 53.0a mm to 56.0a mm, where a is a scale and a > 0.

4. The impeller according to claim 2, wherein: The projected length of the blade tip (34) on the axis of the wheel cover (1) is 45.0a mm to 47.0a mm, and the projected curve length in a plane perpendicular to the axis of the wheel cover (1) is 72.0a mm to 77.0a mm, where a is a scale and a > 0.

5. The impeller according to claim 1, characterized in that: The projection of the leading edge (31) on a plane perpendicular to the axis of the wheel cover (1) is a curve concave towards the trailing edge (32), and the outer diameter of the leading edge (31) is 35.0a mm to 37.0a mm, the inner diameter is 5.0a mm to 5.5a mm, the outer diameter of the trailing edge (32) is 62.0a mm to 66.0a mm, and the inner diameter is 51.0a mm to 54.0a mm, where a is a scale and a > 0.

6. The impeller according to claim 5, wherein: The projected length of the leading edge (31) on the axis of the wheel cover (1) is 3.0a mm to 3.5a mm, and the projected curve length in a plane perpendicular to the axis of the wheel cover (1) is 30.0a mm to 32.0a mm; the distance between the two end points of the projected curve of the trailing edge (32) in a plane perpendicular to the axis of the wheel cover (1) is 10.0a mm to 14.0a mm, where a is a scale and a > 0.

7. The impeller according to claim 1, characterized in that: The wheel hub (2) is conically arranged, the wheel cover (1) is sleeved outside the wheel hub (2), and the twisting direction of the blade (3) is opposite to the rotation direction of the impeller (100).

8. The impeller according to claim 1, wherein: The flow channel (21) is also provided with an inlet area and an outlet area. The inlet area is 3900a 2 mm 2 ~4100a 2 mm 2 , and the outlet area is 5600a 2 mm 2 ~5800a 2 mm 2 , where a is a scale factor and a > 0.

9. A mixed-flow fan, characterized in that, Comprising an impeller according to any one of claims 1 to 8.

10. A bathroom heater, characterized in that, Comprising a mixed-flow fan as described in claim 9, the bathroom heater is provided with an air inlet (6) and an air outlet (7), the mixed-flow fan is arranged close to the air inlet (6), and the air outlet (7) is arranged in a long strip shape.

Images