Mixed flow fan and ducted fan

Abstract

The application provides a mixed flow fan and a ducted fan. The mixed flow fan comprises a volute provided with an air outlet, and a flow guide cone arranged at the air outlet and through which the airflow of the air outlet flows. The generatrix of the flow guide cone comprises a straight line segment and a curved line segment. The mixed flow fan and the ducted fan provided by the application set the generatrix of the flow guide cone as a straight line segment and a curved line segment, guide the airflow generating the wall effect by the curved line segment under the premise of ensuring the flow guide effect, avoid the vortex of the airflow at the air outlet to affect the air outlet effect of the mixed flow fan, and set the straight line segment tangent to the inner shell to avoid the step structure at the joint of the straight line segment and the inner shell to affect the airflow flow, and further ensure the air outlet effect of the mixed flow fan.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air treatment equipment, in particular to a mixed flow fan and ducted air conditioner. BACKGROUND

[0002] The ducted air conditioner is a kind of air conditioner, in order to improve the comfort, some ducted air conditioners adopt the mode of upper cold air outlet and lower hot air outlet, which can realize waterfall type refrigeration and carpet type warm air, in order to realize this air outlet mode, the air outlet of the ducted air conditioner needs to be reversible, in the existing air outlet reversible ducted air conditioner, a tubular fan or a centrifugal fan is usually adopted, but due to the setting mode of the fan blade, the air direction cannot be reversed after being reversed, therefore, at least two fans need to be arranged, one is responsible for forward air outlet, and the other is responsible for reverse air outlet, which not only makes the structure of the ducted air conditioner larger, but also increases the cost.

[0003] In order to reduce the cost, the fan needs to be reduced, and the mixed flow fan is a fan between the axial flow fan and the centrifugal fan, the impeller of the mixed flow fan makes the air do both centrifugal motion and axial motion, the airflow motion in the volute is a mixture of axial flow and centrifugal motion, so it is called "mixed flow". Moreover, the mixed flow fan can not only be made small in size, but also can ensure the flow direction and air pressure of the airflow.

[0004] The guide cone of the mixed flow fan in the prior art is designed unreasonably, which results in low energy efficiency of the mixed flow fan. SUMMARY

[0005] The embodiments of the present application provide a mixed flow fan and a ducted air conditioner to solve the problem of low energy efficiency of the mixed flow fan in the prior art.

[0006] A mixed flow fan, comprising: a volute, wherein an air outlet is arranged on the volute; a guide cone, wherein the guide cone is arranged at the air outlet, and the airflow of the air outlet flows through the guide cone; and a generatrix of the guide cone comprises a straight line segment and a curve segment connected with each other.

[0007] The calculation formula of the generatrix of the guide cone is:

[0008]

[0009]

[0010] Wherein, t is an independent variable, the value range of t is (0, 1), P0 is the bottom end point of the guide cone, P1 is the connection point of the straight line segment and the curve segment of the guide cone, P3 is the top end point of the guide cone, and P2 is the arc control point of the curve segment.

[0011] In the direction of the rotation axis of the guide cone, the ratio of the corresponding size H1 of the straight line segment to the corresponding size H2 of the curve segment is in the range of 0 Thus, the mixed flow fan and the ducted air conditioner are provided, the guide cone of the mixed flow fan is designed reasonably, the energy efficiency of the mixed flow fan is improved, and the cost of the ducted air conditioner is reduced.

[0012] The mixed-flow fan further comprises an inner shell arranged in the volute, and an annular flow channel is formed between the inner shell and the volute, one end of the annular flow channel constituting the air outlet, and the flow cone is arranged on the inner shell.

[0013] The straight line segment is tangent to the part of the inner shell forming the air outlet.

[0014] The straight line segment is tangent to the part of the inner shell forming the air outlet.

[0015] The mixed-flow fan further comprises a guide vane arranged in the annular flow channel, a first edge of the guide vane being fixedly arranged on the outer surface of the inner shell, and a second edge of the guide vane being fixedly arranged on the inner surface of the volute.

[0016] The outer surface of the volute is a curved surface.

[0017] The volute is a spherical-taper structure, and the maximum diameter of the volute is equal to the diameter of the spherical-taper structure.

[0018] The volute is arranged at two end surfaces of the spherical-taper structure and is provided with an air inlet and the air outlet, respectively.

[0019] A ducted fan comprises the mixed-flow fan.

[0020] The mixed-flow fan and the ducted fan provided by the application set the generatrix of the flow cone as a straight line segment plus a curved line segment, under the premise of ensuring the flow guiding effect, the curved line segment is used to guide the airflow generating the wall attachment effect, so as to avoid the vortex of the airflow at the air outlet and affect the air outlet effect of the mixed-flow fan, and the straight line segment is tangent to the inner shell, so as to avoid the step structure at the connection between the straight line segment and the inner shell and affect the airflow flow, and further ensure the air outlet effect of the mixed-flow fan. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The structure diagram of the mixed-flow fan provided by the embodiment of the application;

[0022] Figure 2 The sectional view of the flow cone provided by the embodiment of the application;

[0023] In the drawings:

[0024] 1, volute; 11, air inlet; 12, air outlet; 2, flow cone; 21, straight line segment; 22, curved line segment; 3, inner shell; 4, guide vane. DETAILED DESCRIPTION

[0025] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0026] As shown in Figure 1 and Figure 2 The present application provides a volute 1, which is provided with an air outlet 12; a flow guide cone 2, which is arranged at the air outlet 12, and the airflow of the air outlet 12 flows through the flow guide cone 2; the generatrix of the flow guide cone 2 comprises a straight line segment 21 and a curve segment 22 connected with each other. The generatrix of the flow guide cone 2 is arranged as the straight line segment 21 plus the curve segment 22, which, under the premise of ensuring the flow guiding effect, guides the airflow generating the wall effect, so as to avoid the vortex of the airflow at the air outlet 12, thereby affecting the air outlet effect of the mixed flow fan.

[0027] The calculation formula of the generatrix of the flow guide cone 2 is as follows:

[0028]

[0029]

[0030] Wherein, t is the independent variable, and the value range of t is (0, 1), P0 is the bottom end point of the flow guide cone 2, P1 is the connecting point of the straight line segment 21 and the curve segment 22 of the flow guide cone 2, P3 is the top end point of the flow guide cone 2, and P2 is the arc control point of the curve segment 22.

[0031] Along the direction of the rotation axis of the flow guide cone 2, the ratio of the corresponding size H1 of the straight line segment 21 to the corresponding size H2 of the curve segment 22 is in the range of 0 < H1 / H2 < 1. That is, the ratio of the height size H1 of the straight line segment 21 to the height size H2 of the curve segment 22 is in the range of 0 < H1 / H2 < 1. When the ratio is 0, it means that the generatrix of the flow guide cone 2 at this time has no straight line segment 21, only an arc segment. Since there is no transition of the straight line segment 21, the smooth transition between the inner shell and the flow guide cone 2 cannot be formed, thereby affecting the air outlet effect of the mixed flow fan, and the flow guide cone 2 cannot play an effective flow guiding role at the air outlet 12, which is not conducive to the improvement of the pressure carrying capacity of the mixed flow fan and the maintenance of the efficiency of the mixed flow fan. When the ratio is 1, the height of the flow guide cone 2 is too large at this time, and the flow guide cone 2 will generate a sharp part, which will exceed the rotating radius of the fan. When the mixed flow fan rotates to switch the air outlet direction, interference will occur with the shell, and the large size of the flow guide cone 2 will affect the airflow of the mixed flow fan, so that the pressure carrying capacity and the efficiency of the fan are reduced.

[0032] The simulation test is carried out on the mixed flow fan of the present example, the value of H1 / H2 is changed, and the simulation results are as follows:

[0033]

[0034] According to the simulation data, when H1 / H2 is 0.4, the air volume and the calculated pressure head basically reach the maximum value, and the calculated efficiency of the mixed-flow fan is also basically the maximum; when H1 / H2 increases to 0.8, the air volume and the calculated pressure head both start to decrease, and the calculated efficiency also starts to decrease; when H1 / H2 continues to increase to 1, the air volume and the calculated pressure head further decrease, and the calculated efficiency further decreases; when H1 / H2 continues to increase to 1.3, the proportion of the straight line segment 21 is large, and it is difficult to guide the airflow, so the air volume and the pressure carrying capacity decrease obviously; when H1 / H2 decreases to 0, the air volume, the calculated pressure head and the calculated efficiency reach the maximum value, but the smooth transition between the inner shell 3 and the flow guide cone 2 is not formed due to the absence of the straight line segment 21, thereby affecting the air outlet effect of the mixed-flow fan, and the airflow gathered behind the flow guide cone 2 cannot effectively guide the airflow, which is not conducive to the improvement of the pressure carrying capacity of the mixed-flow fan and the maintenance of the efficiency of the mixed-flow fan.

[0035] The mixed-flow fan further comprises an inner shell 3, the inner shell 3 is arranged in the volute 1, and an annular flow channel is formed between the inner shell 3 and the volute 1, one end of the annular flow channel constitutes the air outlet 12, and the flow guide cone 2 is arranged on the inner shell 3. The inner shell 3 is used for mounting the impeller and the driving motor of the mixed-flow fan, and the annular flow channel is used for guiding the airflow discharged by the impeller to a certain extent, so that the airflow at the air outlet 12 can be gathered to the same place after being discharged, thereby ensuring the air outlet effect of the mixed-flow fan, and the flow guide cone 2 arranged on the inner shell 3 can further guide the airflow in the annular flow channel, avoid the vortex generated after the airflow in multiple directions is gathered, and ensure the air outlet effect of the mixed-flow fan.

[0036] The straight line segment 21 is tangent to the part of the flow guide cone 2 connected with the inner shell 3. That is, the airflow at the air outlet 12 flows through the straight line segment 21 and the curve segment 22 in sequence, so that the airflow generating the Coanda effect is guided by the curve segment 22, and the vortex generated by the airflow at the air outlet 12 is avoided, thereby affecting the air outlet effect of the mixed-flow fan.

[0037] The straight line segment 21 is tangent to the part of the inner shell 3 forming the air outlet 12. The step structure at the connection between the straight line segment 21 and the inner shell 3 is avoided, thereby further ensuring the air outlet effect of the mixed-flow fan.

[0038] The mixed flow fan further comprises a guide vane 4 arranged in the annular flow channel, a first edge of the guide vane 4 is fixedly arranged on the outer surface of the inner shell 3, and a second edge of the guide vane 4 is fixedly arranged on the inner surface of the volute 1. The guide vane 4 further guides the airflow in the annular flow channel, thereby ensuring the air outlet effect of the mixed flow fan.

[0039] The outer surface of the volute 1 is curved. That is, the cross section of the outer surface of the volute 1 is a curved segment 22.

[0040] The volute 1 is in a spherical-ta structure, and the maximum diameter of the volute 1 is equal to the diameter of the spherical-ta structure. That is, the volute 1 can rotate freely in a spherical space with a fixed diameter centered on the center of the spherical-ta structure. When the ducted fan is applied to a ducted fan machine and the ducted fan machine requires air inlet and outlet in the up-down direction, the ducted fan machine can provide a spherical space with a fixed diameter for the mixed flow fan provided by the application, and the rotation of the mixed flow fan can switch the air inlet and outlet direction of the ducted fan machine.

[0041] The volute 1 is provided with an air inlet 11 and an air outlet 12 at two end surfaces of the spherical-ta structure. By arranging the air inlets and outlets (the air inlet 11 and the air outlet 12) at the end surfaces, the size of the air inlets and outlets can be ensured, and the safety hazard caused by the exposure of the internal structure of the volute 1 due to the hole opening in the curved part of the volute 1 can be avoided.

[0042] A ducted fan machine comprising the mixed flow fan.

[0043] The above embodiments only express several embodiments of the application, and the description is more specific and detailed, but it cannot be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the application, several modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A mixed-flow fan, characterized in that: include: A volute (1) is provided with an air outlet (12); A guide cone (2) is provided at the air outlet (12), and the airflow of the air outlet (12) flows through the guide cone (2); The generatrix of the guide cone (2) includes a connected straight segment (21) and a curved segment (22); The formula for calculating the generatrix of the guide cone (2) is as follows: Where: t is the independent variable, and the range of t is (0,1), P0 is the bottom endpoint of the guide cone (2), P1 is the connection point between the straight segment (21) and the curved segment (22) of the guide cone (2), P3 is the top endpoint of the guide cone (2), and P2 is the arc control point of the curved segment (22).

2. The mixed-flow fan according to claim 1, characterized in that: Along the rotation axis of the guide cone (2), the ratio of the dimension H1 corresponding to the straight segment (21) to the dimension H2 corresponding to the curved segment (22) is 0 < H1 / H2 < 1.

3. The mixed-flow fan according to claim 1, characterized in that: The mixed-flow fan also includes an inner shell (3), which is disposed inside the volute, and an annular flow channel is formed between the inner shell (3) and the volute. One end of the annular flow channel constitutes the air outlet (12), and the guide cone (2) is disposed on the inner shell (3).

4. The mixed-flow fan according to claim 3, characterized in that: The portion of the guide cone (2) corresponding to the straight segment (21) is connected to the inner shell (3).

5. The mixed-flow fan according to claim 4, characterized in that: The straight segment (21) is tangentially arranged with the inner shell (3) to form the air outlet (12).

6. The mixed-flow fan according to claim 3, characterized in that: The mixed-flow fan also includes a guide vane (4), which is disposed in the annular flow channel. The first edge of the guide vane (4) is fixedly disposed with the outer surface of the inner shell (3), and the second edge of the guide vane (4) is fixedly disposed with the inner surface of the volute (1).

7. The mixed-flow fan according to claim 1, characterized in that: The outer surface of the volute (1) is curved.

8. The mixed-flow fan according to claim 1, characterized in that: The volute (1) is a ball table structure, and the maximum diameter of the volute (1) is equal to the diameter of the ball table structure.

9. The mixed-flow fan according to claim 8, characterized in that: The volute (1) is provided with an air inlet (11) and an air outlet (12) at the two end faces of the table structure.

10. A ducted air conditioner, characterized in that: The mixed-flow fan includes any one of claims 1 to 9.

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