Mixed flow fan blade, air duct structure and air conditioner indoor unit

Abstract

The present invention provides a mixed flow fan blade, an air duct structure and an air conditioner indoor unit, wherein the mixed flow fan blade comprises: a hub; a plurality of mixed flow blades, the plurality of mixed flow blades are arranged on the outer peripheral surface of the hub along the circumference of the hub, a guide gap is formed between two adjacent mixed flow blades, the guide gap has a circumferential air outlet, so that at least part of the airflow entering the guide gap flows out from the circumferential air outlet along the radial direction of the hub under the centrifugal action of the mixed flow blades; a straightening blade, arranged on the outer peripheral surface of the hub, the straightening blade and the mixed flow blade are arranged at intervals, the length of the straightening blade along the axial extension direction of the hub is less than the length of the mixed flow blade, one end of the straightening blade extends to the end of the hub, so that the airflow at the mixed flow blade is straightened by the straightening blade. The technical solution provided by the present invention can solve the technical problem of vortex phenomenon between the mixed flow blades of the mixed flow fan blade in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a mixed flow fan blade, an air duct structure and an air conditioning indoor unit. Background Art

[0002] At present, the mixed flow fan in the prior art generally includes a hub and mixed flow blades, and the mixed flow blades are arranged on the hub. Generally, the operation noise problem is controlled by controlling the number of fan blades, but when the fan blades are small, the fan blades do little work, which will affect the air volume, and when the distance between the fan blades is large, the airflow between the blades will generate vortices, which will cause noise. Summary of the invention

[0003] The main purpose of the present invention is to provide a mixed flow fan blade, an air duct structure and an air conditioner indoor unit to solve the technical problem of vortex phenomenon between the mixed flow blades of the mixed flow fan blade in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a mixed flow fan blade is provided, comprising: a hub; a plurality of mixed flow blades, which are arranged on the outer peripheral surface of the hub along the circumference of the hub, and a guide gap is formed between two adjacent mixed flow blades, and the guide gap has a circumferential air outlet, so that at least part of the airflow entering the guide gap flows out from the circumferential air outlet along the radial direction of the hub under the centrifugal action of the mixed flow blades; straightening blades, which are arranged on the outer peripheral surface of the hub, the straightening blades are spaced apart from the mixed flow blades, the length of the straightening blades along the axial extension direction of the hub is smaller than the length of the mixed flow blades, and one end of the straightening blades extends to the end of the hub, so that the airflow at the mixed flow blades can be straightened by the straightening blades.

[0005] Furthermore, the hub is a frustum structure, the first end of the mixed flow blade is connected to the large diameter end of the hub, and the second end of the mixed flow blade is connected to the small diameter end of the hub; the radius of the outer circle of the large diameter end of the hub is R1, and the width of the first end of the mixed flow blade is b1, wherein b1≥R1.

[0006] Furthermore, along the axial extension direction of the hub, the length of the mixed flow blade is h1, the length of the straightening blade is h2, and 0.25≤h2 / h1≤0.75.

[0007] According to another aspect of the present invention, there is provided an air duct structure, comprising: a mixed flow blade, which is the mixed flow blade provided above; and an air duct shell, in which the mixed flow blade is arranged.

[0008] Furthermore, the air duct shell includes a flow guide portion and a blade accommodating portion, which are connected to each other. The blade accommodating portion is used to accommodate the mixed flow blades, and the flow guide portion is used to guide the airflow of the mixed flow blades; the inner wall surface of the blade accommodating portion is formed by rotating a line segment whose generatrix is ​​a first arc line around a first rotation axis.

[0009] Furthermore, the fan blade accommodating portion has an opening end and a first connecting end that are relatively arranged, and the first connecting end is used to connect with the guide portion. Along the direction from the first connecting end to the opening end, the distance between the first arc and the first rotation axis gradually decreases.

[0010] Furthermore, the guide portion includes a transition section and a necking section, one end of the transition section is connected to the fan blade accommodating portion, and the other end of the transition section is connected to the necking section, and the flow area of ​​the necking section is smaller than the cross-sectional area of ​​the first connecting end, so that a negative pressure zone is formed in the necking section under the action of the mixed flow fan blade, and the airflow flows from the guide portion into the fan blade accommodating portion under the action of the negative pressure zone.

[0011] Furthermore, the constricted section is a cylindrical tube, so that a negative pressure area is formed in the cylindrical tube under the action of the mixed flow blade.

[0012] Furthermore, in the direction from the fan blade accommodating portion to the air guide portion, the flow area of ​​the transition section gradually decreases.

[0013] Furthermore, the inner wall surface of the guide portion is formed by rotating a line segment whose generatrix is ​​a second arc line around a second rotation axis, so that the airflow flows from the fan blade accommodating portion into the guide portion under the action of the guide portion.

[0014] Furthermore, the guide portion has a guide end and a second connecting end that are relatively arranged, and the second connecting end is used to connect with the fan blade accommodating portion. Along the direction from the second connecting end to the guide end, the distance between the second arc and the second rotation axis gradually decreases.

[0015] Furthermore, the inner wall of the air duct housing is a drum-shaped structure, so that the airflow flows from the fan blade accommodating portion into the guiding portion under the action of the drum-shaped structure.

[0016] According to another aspect of the present invention, an air conditioner indoor unit is provided. The air conditioner indoor unit includes an air duct structure. The air duct structure is the air duct structure provided above.

[0017] By applying the technical solution of the present invention, the air outlet range can be increased by adding circumferential air outlets, and the centrifugal effect of the mixed flow fan blade can be improved by making at least part of the airflow in the guide gap flow out from the circumferential air outlet along the radial direction of the hub under the centrifugal effect. At the same time, by adding a straightening blade and extending one end of the straightening blade to the end of the hub, it is convenient for the straightening blade to straighten the airflow at the mixed flow blade, reducing the occurrence of vortex phenomenon, and further reducing the noise caused by vortex. Therefore, the technical solution provided by the present invention can solve the technical problem of vortex between the mixed flow blades of the mixed flow fan blade in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 It shows a front view of the air duct structure provided according to the second embodiment of the present invention;

[0020] Figure 2 It shows a schematic structural diagram of the air duct structure provided according to the second embodiment of the present invention;

[0021] Figure 3 It shows a front view of the air duct structure provided according to the third embodiment of the present invention;

[0022] Figure 4 It shows a schematic structural diagram of the air duct structure provided according to the third embodiment of the present invention;

[0023] Figure 5 It shows a schematic structural diagram of a mixed flow fan blade provided according to the first embodiment of the present invention; and

[0024] Figure 6 A schematic structural diagram of a mixed flow fan blade with rectifying blades provided according to the first embodiment of the present invention is shown.

[0025] The above drawings include the following reference numerals:

[0026] 10. Mixed flow blade; 11. Hub; 12. Mixed flow blade; 13. Rectifying blade; 14. Circumferential air outlet; 20. Air duct housing; 21. Air guide portion; 211. Transition section; 212. Narrowing section; 22. Blade accommodating portion. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] like Figures 1 to 6As shown, an embodiment of the present invention provides a mixed flow blade 10, which includes: a hub 11, a plurality of mixed flow blades 12 and a straightening blade 13. The plurality of mixed flow blades 12 are arranged on the outer peripheral surface of the hub 11 along the circumference of the hub 11, and a guide gap is formed between two adjacent mixed flow blades 12. The guide gap has a circumferential air outlet 14, so that at least part of the airflow entering the guide gap flows out from the circumferential air outlet 14 along the radial direction of the hub 11 under the centrifugal action of the mixed flow blades 12. The straightening blade 13 is arranged on the outer peripheral surface of the hub 11, and the straightening blade 13 is arranged at intervals from the mixed flow blade 12. The length of the straightening blade 13 along the axial extension direction of the hub 11 is less than the length of the mixed flow blade 12, and one end of the straightening blade 13 extends to the end of the hub 11, so that the airflow at the mixed flow blade 12 is straightened by the straightening blade 13.

[0029] By using the mixed flow fan blade 10 provided in this embodiment, the air outlet range can be increased by adding the circumferential air outlet 14, and by making at least part of the airflow in the guide gap flow out from the circumferential air outlet 14 along the radial direction of the hub 11 under the centrifugal effect, the centrifugal effect of the mixed flow fan blade 10 can be improved. At the same time, by adding a straightening blade 13 and extending one end of the straightening blade 13 to the end of the hub 11, it is convenient for the straightening blade 13 to straighten the airflow at the mixed flow blade 12, reducing the occurrence of vortex phenomenon, and further reducing the noise caused by vortex. Therefore, the mixed flow fan blade 10 provided in this embodiment can solve the technical problem of vortex between the mixed flow blades 12 of the mixed flow fan blade 10 in the prior art.

[0030] Specifically, the hub 11 is a truncated cone structure, the first end of the mixed flow blade 12 is connected to the large diameter end of the hub 11, and the second end of the mixed flow blade 12 is connected to the small diameter end of the hub 11; the radius of the outer circle of the large diameter end of the hub 11 is R1, and the width of the first end of the mixed flow blade 12 is b1, wherein b1≥R1. With such a configuration, by increasing the width of the first end of the mixed flow blade 12, it is possible to form a negative pressure zone at a position where the mixed flow blade 12 is close to the hub 11, thereby better improving the centrifugal effect of the mixed flow fan blade 10.

[0031] Specifically, the width of the first end of the mixed flow blade 12 in this embodiment is b1, and the width of the second end of the mixed flow blade 12 is b2, where b2>b1. This arrangement can achieve a better mixed flow effect. Specifically, the width of the first end of the mixed flow blade 12 can be equal to or similar to the width of the second end of the mixed flow blade 12.

[0032] In this embodiment, the wind outlet angle at the first end of the mixed flow blade 12 is θ1, and the wind outlet angle at the second end of the mixed flow blade 12 is θ2, and 15°≤θ2-θ1≤20°. Specifically, the wind outlet angle at the first end of the mixed flow blade 12 refers to the angle between the tangent at the first end of the mixed flow blade 12 and the axis of the hub 11, and the wind outlet angle at the second end of the mixed flow blade 12 refers to the angle between the tangent at the second end of the mixed flow blade 12 and the axis of the hub 11. With such a setting, the arc inclination angle of the mixed flow blade 12 can be small, so as to better realize the centrifugal effect when the mixed flow blade 10 is working, so that the mixed flow blade 12 has the effect of a centrifugal fan when rotating. In the case of adding the volute profile, the centrifugal fan air outlet mode can be realized, which can meet more air conditioning product development needs.

[0033] In this embodiment, the length of the mixed flow blade 12 along the axial extension direction of the hub 11 is h, the radius of the outer circumference of the large diameter end of the hub 11 is R1, and h>R1. This arrangement can better improve the centrifugal effect.

[0034] Specifically, the end surface of the first end of the mixed flow blade 12 is a plane, so that the end surface of the first end of the mixed flow blade 12 can be arranged flush with the end surface of the large diameter end of the hub 11. With such an arrangement, the mixed flow blade 12 can better guide the airflow to better improve the centrifugal effect.

[0035] Specifically, the end surface of the first end of the mixed flow blade 12 is a plane, and the end surface of the first end of the mixed flow blade 12 can be inclined toward the direction close to the second end of the mixed flow blade 12 .

[0036] Specifically, the angle between the end surface of the first end of the mixed flow blade 12 and the end surface of the large diameter end of the hub 11 is θ3, where 0°<θ3≤20°. Generally speaking, the smaller the angle, the better, so that the mixed flow blade 12 can better guide the airflow.

[0037] Specifically, the end surface of the second end of the mixed flow blade 12 is a plane, so that the end surface of the second end of the mixed flow blade 12 can be arranged flush with the end surface of the small diameter end of the hub 11. With such an arrangement, the second end of the mixed flow blade 12 can guide the airflow easily.

[0038] Specifically, the end surface of the second end of the mixed flow blade 12 is a plane, and the end surface where the second end of the mixed flow blade 12 is located can be inclined in a direction away from the first end of the mixed flow blade 12 .

[0039] Specifically, the angle between the end surface where the second end of the mixed flow blade 12 is located and the end surface of the small diameter end of the hub 11 is θ4, where 0°<θ4≤30°. With such a setting, the second end of the mixed flow blade 12 can be easily guided to the airflow, and at the same time, the influence on the dynamic balance effect of the mixed flow blade 10 can be avoided.

[0040] Furthermore, along the axis extension direction of the hub 11, the length of the mixed flow blade 12 is h1, the length of the straightening blade 13 is h2, and 0.25≤h2 / h1≤0.75. With such a setting, the vortex phenomenon between two adjacent mixed flow blades 12 can be better reduced by adjusting the ratio between the straightening blade 13 and the mixed flow blade 12, thereby better reducing the noise generated by the vortex.

[0041] In order to better reduce the occurrence of vortex phenomena, there are multiple mixed flow blades 12 and multiple straightening blades 13 in this embodiment. The multiple mixed flow blades 12 are arranged at intervals on the hub 11, and a straightening blade 13 is arranged between any two adjacent mixed flow blades 12 to straighten the airflow between the two adjacent mixed flow blades 12 through the straightening blade 13.

[0042] The second embodiment of the present invention provides an air duct structure, which includes a mixed flow blade 10 and an air duct housing 20 . The mixed flow blade 10 is the mixed flow blade 10 provided in the first embodiment, and the mixed flow blade 10 is arranged in the air duct housing 20 .

[0043] Specifically, the air duct housing 20 in this embodiment includes a guide portion 21 and a blade accommodating portion 22, the guide portion 21 and the blade accommodating portion 22 are connected, the blade accommodating portion 22 is used to accommodate the mixed flow blade 10, and the guide portion 21 is used to guide the airflow of the mixed flow blade 10. The inner wall surface of the blade accommodating portion 22 is formed by rotating a line segment whose generatrix is ​​a first arc around a first rotation axis to better guide the airflow.

[0044] In this embodiment, the fan blade accommodating portion 22 has an opening end and a first connecting end that are arranged opposite to each other, the first connecting end is used to connect with the air guide portion 21, and along the direction from the first connecting end to the opening end, the distance between the first arc and the first rotation axis gradually decreases. With such a setting, the airflow can be better guided.

[0045] In the air duct structure in the second embodiment, the air guide 21 includes a transition section 211 and a constricted section 212, one end of the transition section 211 is connected to the fan blade receiving section 22, and the other end of the transition section 211 is connected to the constricted section 212, and the flow area of ​​the constricted section 212 is smaller than the cross-sectional area of ​​the first connection end, so that a negative pressure area is formed in the constricted section 212 under the action of the mixed flow fan 10, and the air flow flows from the air guide 21 into the fan blade receiving section 22 under the action of the negative pressure area. With such a setting, the pressure of air supply to the air guide 21 is increased by setting the constricted section 212, and then a low pressure area is formed in the middle of the constricted section, thereby achieving the effect of air supply from the air guide 21 to the fan blade receiving section 22.

[0046] Specifically, the constricted section 212 in this embodiment is a cylindrical tube, so that a negative pressure area is formed in the cylindrical tube under the action of the mixed flow blade 10. Specifically, the radius of the constricted section 212 is the average value of the sum of the radius at the first end and the radius at the second end of the mixed flow blade 10.

[0047] In order to better guide the airflow, the flow area of ​​the transition section 211 gradually decreases in the direction from the fan blade accommodating portion 22 to the air guide portion 21 .

[0048] Embodiment 3 of the present invention provides an air duct structure, wherein the inner wall surface of the guide portion 21 in Embodiment 3 is formed by rotating a line segment whose generatrix is ​​a second arc line around a second rotation axis, so that under the action of the guide portion 21, the airflow flows from the fan blade accommodating portion 22 into the guide portion 21.

[0049] Specifically, the guide portion 21 in this embodiment has a guide end and a second connection end that are arranged opposite to each other, and the second connection end is used to connect with the fan blade receiving portion 22. In the direction from the second connection end to the guide end, the distance between the second arc and the second rotation axis gradually decreases. With such a setting, the airflow can be better guided so that the airflow flows from the fan blade receiving portion 22 into the guide portion.

[0050] Specifically, the inner wall of the air duct housing 20 in this embodiment is a drum-shaped structure, so that the airflow flows into the guide portion from the fan blade accommodating portion 22 under the action of the drum-shaped structure. With such a configuration, the airflow will be blown out along the inner wall of the drum-shaped structure.

[0051] A fourth embodiment of the present invention provides an air conditioner indoor unit, the air conditioner indoor unit includes an air duct structure, and the air duct structure is the air duct structure provided in the third embodiment.

[0052] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: it is convenient for the rectifying blades to rectify the airflow at the mixed flow blades, thereby increasing the amount of work done, increasing the air volume, reducing the occurrence of vortex phenomena, and thereby reducing the noise caused by vortexes, and adding different air supply methods to facilitate suitability for different usage scenarios.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air duct structure, characterized in that: include: The mixed flow impeller (10) comprises: Wheel hub (11); a plurality of mixed flow blades (12), the plurality of mixed flow blades (12) being arranged on an outer peripheral surface of the hub (11) along the circumference of the hub (11), a flow guide gap being formed between two adjacent mixed flow blades (12), the flow guide gap having a circumferential air outlet, so that at least part of the airflow entering the flow guide gap flows out from the circumferential air outlet along the radial direction of the hub (11) under the centrifugal action of the mixed flow blades (12); a straightening blade (13) arranged on the outer peripheral surface of the hub (11), the straightening blade (13) and the mixed flow blade (12) being arranged at intervals, the length of the straightening blade (13) along the axial extension direction of the hub (11) being shorter than the length of the mixed flow blade (12), and one end of the straightening blade (13) extending to the end of the hub (11) so as to straighten the airflow at the mixed flow blade (12) through the straightening blade (13); An air duct housing (20), wherein the mixed flow blade (10) is arranged in the air duct housing (20); The air duct housing (20) comprises a flow guide portion (21) and a fan blade accommodating portion (22); the flow guide portion (21) and the fan blade accommodating portion (22) are connected to each other; the fan blade accommodating portion (22) is used to accommodate the mixed flow fan blade (10); the flow guide portion (21) is used to guide the airflow of the mixed flow fan blade (10); an inner wall surface of the fan blade accommodating portion (22) is formed by rotating a line segment whose generatrix is ​​a first arc line around a first rotation axis; The fan blade accommodating portion (22) has an opening end and a first connecting end that are arranged opposite to each other, the first connecting end being used to connect to the air guide portion (21), and along the direction from the first connecting end to the opening end, the distance between the first arc and the first rotation axis gradually decreases; The flow guide portion (21) comprises a transition section (211) and a constricted section (212); one end of the transition section (211) is connected to the fan blade accommodating portion (22); the other end of the transition section (211) is connected to the constricted section (212); the flow area of ​​the constricted section (212) is smaller than the cross-sectional area of ​​the first connecting end, so that a negative pressure area is formed in the constricted section (212) under the action of the mixed flow fan blade (10); and under the action of the negative pressure area, the airflow flows from the flow guide portion (21) into the fan blade accommodating portion (22).

2. The air duct structure according to claim 1, characterized in that: The hub (11) is a truncated cone structure; the first end of the mixed flow blade (12) is connected to the large diameter end of the hub (11), and the second end of the mixed flow blade (12) is connected to the small diameter end of the hub (11); the radius of the outer circle of the large diameter end of the hub (11) is R1, and the width of the first end of the mixed flow blade (12) is b1, wherein b1≥R1.

3. The air duct structure according to claim 1, characterized in that: Along the axial extension direction of the hub (11), the length of the mixed flow blade (12) is h1, the length of the straightening blade (13) is h2, and 0.25≤h2 / h1≤0.

75.

4. The air duct structure according to claim 1, characterized in that: The constricted section (212) is a cylindrical tube, so that a negative pressure area is formed inside the cylindrical tube under the action of the mixed flow blade (10).

5. The air duct structure according to claim 1, characterized in that: In the direction from the fan blade accommodating portion (22) to the flow guiding portion (21), the flow area of ​​the transition section (211) gradually decreases.

6. An air conditioner indoor unit, characterized in that: The air conditioner indoor unit comprises an air duct structure, and the air duct structure is the air duct structure according to any one of claims 1 to 5.

Images