WO2023226366A1

WO2023226366A1 - Mixed-flow fan and air-duct type air conditioner

Info

Publication number: WO2023226366A1
Application number: PCT/CN2022/137474
Authority: WO
Inventors: 董明珠; 刘华; 刘煜; 丁绍军
Original assignee: 珠海格力电器股份有限公司
Priority date: 2022-05-27
Filing date: 2022-12-08
Publication date: 2023-11-30
Also published as: CN114909333A

Abstract

A mixed-flow fan and an air-duct type air conditioner comprising same. The mixed flow fan comprises a volute (1), an impeller (2) and a rear guide vane structure. The volute (1) is provided with an air outlet (12), and the impeller (2) is arranged inside the volute (1). The rear guide vane structure is arranged between the air outlet (12) and the impeller (2); a gap (13) is provided between the rear guide vane structure and the impeller (2); and the ratio of the height H of the gap (13) to the height H2 of the impeller (2) ranges from 0.18 to 0.24. In the mixed-flow fan, by defining the gap between the rear guide vane structure and the impeller, the guide vane structure can effectively guide the air output of the impeller, thereby improving the efficiency of the mixed-flow fan.

Description

Mixed flow fans and duct fans

Cross-references to related applications

This disclosure is based on the Chinese application with application number 202210584168.6 and the filing date is May 27, 2022, and claims its priority. The disclosure content of the Chinese application is hereby incorporated into this disclosure as a whole.

Technical field

The present disclosure relates to the technical field of air treatment equipment, in particular to a mixed-flow fan and an air duct fan.

Background technique

The duct machine is a type of air conditioner. In order to improve comfort, some duct machines use the method of emitting cold air from the top and hot air from the bottom. This can achieve waterfall cooling and carpet-type heating. In order to achieve this air outlet method, it is necessary to The air outlet of the air duct fan is reversible. Among the existing air duct fans with reversible air outlet, cross-flow fans and centrifugal fans are usually used. However, due to the problem of the arrangement of the fan blades, the wind direction cannot be reversible after reversal. Therefore, , you can only install at least two fans, one responsible for forward air discharge and one responsible for reverse air discharge. In this way, not only will the structure of the air duct machine be larger, but the cost will be higher.

In order to reduce costs, the fan needs to be smaller, and the mixed-flow fan is a fan between the axial flow fan and the centrifugal fan. The impeller of the mixed-flow fan allows the air to move both centrifugally and axially, and the airflow movement in the volute is mixed. It combines two forms of motion, axial flow and centrifugal flow, so it is called "mixed flow". Moreover, the mixed-flow fan can not only make the volume smaller, but also ensure the direction and pressure of the air flow.

The spacing between the rear guide vane structure and the impeller in the mixed-flow fan in the related art is unreasonably designed, resulting in low energy efficiency of the mixed-flow fan.

Contents of the invention

Embodiments of the present disclosure provide a mixed-flow fan and an air duct machine to solve the problem of low energy efficiency of mixed-flow fans in related technologies.

A mixed-flow fan, including:

Volute, the volute is provided with an air outlet;

Impeller, the impeller is arranged in the volute;

The rear guide vane structure is arranged between the air outlet and the impeller. There is a distance between the rear guide vane structure and the impeller. The ratio of the height H of the distance to the height H2 of the impeller ranges from 0.18 to 0.24.

According to some embodiments of the present disclosure, the rear guide vane structure includes a plurality of guide vanes, and all the guide vanes are annularly distributed with the axis of the impeller as the axis.

According to some embodiments of the present disclosure, at least one guide vane is provided with a swing shaft, the axis of the swing shaft has an included angle with the axis of the impeller, and the guide vane with the swing shaft can swing with the axis of the swing shaft as the axis.

According to some embodiments of the present disclosure, the included angle is 90°.

According to some embodiments of the present disclosure, the swing angle α of the guide vane ranges from 0° to 10°.

According to some embodiments of the present disclosure, silencer teeth are provided on the rear guide vane structure.

According to some embodiments of the present disclosure, the mixed-flow fan further includes an inner shell. The inner shell is disposed between the impeller and the air outlet. An annular air duct is formed between the outer surface of the inner shell and the inner surface of the volute. The rear guide vane structure is provided in the circular air duct.

According to some embodiments of the present disclosure, the rear guide vane structure includes a plurality of guide vanes, the first edge of the guide vane is fixedly arranged on the outer surface of the inner shell, and the second edge of the guide vane is fixedly arranged on the inner surface of the volute.

According to some embodiments of the present disclosure, the expansion angle of the rear guide vane structure ranges from 10° to 40°.

According to some embodiments of the present disclosure, the outer surface of the volute is a curved surface.

According to some embodiments of the present disclosure, the volute is a truncated sphere, and the maximum diameter of the volute is equal to the diameter of the truncated sphere.

According to some embodiments of the present disclosure, the volute is provided with an air inlet and an air outlet at two end surfaces of the truncated sphere respectively.

Another aspect of the present disclosure provides an air duct fan, including the above-mentioned mixed flow fan.

The mixed-flow fan and air duct machine provided by the present disclosure, by limiting the distance between the rear guide vane structure and the impeller, enable the guide vane structure to effectively guide the air outflow from the impeller, ensuring that the size of the volute of the mixed-flow fan can meet the wind requirements. The internal rotation requirements of the tube machine, while ensuring that the pressure head of the impeller can meet the set requirements, thereby ensuring the performance of the mixed flow fan. In particular, a swing axis is set on the guide vane to make the direction of the airflow discharged by the guide vane and the impeller match as much as possible. , to further ensure the working effect of the mixed flow fan. When the air inlet and outlet direction of the air duct machine changes, the mixed flow fan can rotate as a whole as needed without interfering with the air duct machine, thereby ensuring the air outlet effect of the air duct machine.

Description of the drawings

Figure 1 is a schematic structural diagram of a mixed flow fan and an air duct fan provided by an embodiment of the present disclosure;

Figure 2 is a schematic structural diagram of the spacing and rear guide vane structure provided by an embodiment of the present disclosure;

Figure 3 is a schematic structural diagram of an impeller provided by an embodiment of the present disclosure;

Figure 4 is a schematic structural diagram of a guide vane and a swing shaft provided by an embodiment of the present disclosure;

Figure 5 is a schematic structural diagram of the guide vane and its swing angle α provided by an embodiment of the present disclosure;

In the picture: 1. Volute; 12. Air outlet; 2. Impeller; 33. Guide vane; 13. Spacing; 34. Swing shaft; 4. Inner shell.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present disclosure and are not intended to limit the present disclosure.

In the mixed-flow fan in the related art, when the impeller 2 rotates at high speed, the airflow will be driven out of the impeller 2 with a high dynamic pressure and enter the raceway section between the impeller 2 and the rear guide vane structure. This raceway section can guide the high-speed rotating airflow from the radial direction to the horizontal direction, and the sudden pressure release will convert part of the dynamic pressure of the airflow into static pressure, which is used to support the subsequent flow of the fan. Although the racemic section can direct the rotating airflow to the horizontal direction, it still carries huge tangential velocities, and these velocity components are not conducive to subsequent flow. The function of the rear guide vane structure is to convert the tangential velocity of the airflow into more horizontal velocity, and again convert the huge dynamic pressure into static pressure to improve the pressure carrying capacity of the fan. In the related art, the energy efficiency of fans is improved by adjusting the structure of the impeller and/or the structure of the rear guide vane. However, after the applicant's research on the principles of airflow and analysis of simulation experimental data, it was found that , the length of the raceway section is extremely important. On the one hand, as the isolation section between the moving blade (impeller) and the stationary blade (rear guide vane structure), a sufficient distance can suppress the generation of turbulence noise. On the other hand, too long a distance will It will increase the flow loss, compress the size of the remaining fan components, and reduce the fan's performance. Therefore, the appropriate length of the racemic section is extremely important for improving the performance of the mixed-flow fan system.

In some embodiments of the present disclosure, based on the above reasons, as shown in Figures 1 to 5, the present disclosure discloses a mixed-flow fan, including: a volute 1 with an air outlet 12 provided on the volute 1; an impeller 2, The impeller 2 is arranged in the volute 1; the rear guide vane structure is arranged between the air outlet 12 and the impeller 2. There is a distance 13 between the rear guide vane structure and the impeller 2. The height H of the distance 13 is different from the height H of the impeller 2. The ratio of height H2 ranges from 0.18 to 0.24. The position of the volute 1 corresponding to the pitch 13 forms the aforementioned raceway section. The height H of the pitch 13 and the height H2 of the impeller 2 are both dimensions along the axis of the impeller 2 . The axis of the impeller 2 is the rotation axis of the impeller 2 during the working process.

Conduct a simulation test on the mixed-flow fan in this example, and change the values of the height H of the mixed-flow fan's spacing 13 and the height H2 of the impeller 2. The simulation results are as follows:

According to the simulation data, when H/H2 is 0.22, the spacing of 13 can provide enough pressure relief space for conversion of dynamic pressure and static pressure, so that the air volume and pressure head of the mixed-flow fan reach the maximum value, and the expansion loss is reduced to the minimum; when H/H2 increases to 0.24, the air volume and pressure head of the mixed-flow fan begin to decrease, and the expansion loss increases; and when H/H2 continues to increase to 0.26, the air volume and pressure head of the mixed-flow fan both begin to decrease. Seriously reduced, the expansion loss seriously increased, reaching a state that cannot be used, and when H/H2 continues to increase, it shows that the distance 13 at this time is gradually reduced, and the size of the distance 13 is difficult to provide sufficient pressure relief space. The conversion of dynamic pressure and static pressure causes the pressure head of the mixed-flow fan to decrease, and because the structure of the impeller 2 and the rear guide vane is too close, the airflow with a high-speed rotation speed component will increase the expansion loss of the mixed-flow fan, thereby causing the mixed-flow fan to The overall air volume decreases; when H/H2 decreases to 0.18, the air volume and pressure head of the mixed-flow fan also begin to decrease, and the expansion loss increases; and when H/H2 decreases to 0.15, the air volume and pressure head of the mixed-flow fan become serious decreases, the diffusion loss increases seriously, and when H/H2 gradually decreases, it indicates that H2 is gradually increasing at this time. The excessive spacing 13 causes the dynamic pressure and static pressure of the airflow to transition, causing the impeller 2 The working capacity decreases, the expansion loss increases, and the performance of the mixed flow fan cannot be guaranteed.

In some embodiments of the present disclosure, the rear guide vane structure includes a plurality of guide vanes 33 , and all guide vanes 33 are annularly distributed with the axis of the impeller 2 as an axis.

In some embodiments of the present disclosure, at least one guide vane 33 is provided with a swing shaft 34 , the axis of the swing shaft 34 has an included angle with the axis of the impeller 2 , and the guide vane 33 with the swing shaft 34 can rotate with the swing shaft 34 The axis swings for the axis. The function of the rear guide vane structure is to further guide the air outflow from the impeller. When the impeller 2 works at different speeds, the angle at which the gas flows out of the impeller 2 is different, that is, the angle at which the airflow enters the gap 13 is different, and The size of the gap 13 is certain, so that its racemic ability is certain, that is, the ability to change the gas angle is certain. When the angle of the gas entering the gap 13 is different, the angle of the gas entering the rear guide vane structure is also different. In order to make the flow angle of the airflow as consistent as possible with the angle of the airflow at the discharge distance 13, through the swing of the guide vanes 33, the flow angle of the airflow in the rear guide vane structure also changes accordingly, further increasing the rear guide vane structure. The consistency of the direction of the outflow airflow is beneficial to increasing the exhaust uniformity of the mixed-flow fan, ensuring that the mixed-flow fan can achieve optimal air volume values and optimal airflow driving performance at multiple operating speeds. Preferably, when the rotational speed of the impeller 2 is larger, the angle at which the airflow leaves the impeller 2 is also larger, so the inclination angle of the guide vanes 33 is required to be larger. On the contrary, the smaller the rotational speed of the impeller 2, the inclination angle of the guide vanes 33 is larger. Small.

In some embodiments of the present disclosure, the swing angle α of the guide vane 33 ranges from 0° to 10°. Preferably 0° to 5°.

In some embodiments of the present disclosure, the angle range between the swing axis 34 and the axis of the impeller 2 is 90°. This ensures that there will be no structural interference with the volute 1 during the swing of the guide vane 33, ensuring that the structures of the guide vane 33 and the volute 1 are reliable.

In some embodiments of the present disclosure, silencer teeth are provided on the rear guide vane structure. Use silencer teeth to achieve noise reduction.

In some embodiments of the present disclosure, the mixed-flow fan further includes an inner shell 4. The inner shell 4 is disposed between the impeller 2 and the air outlet 12. An annular air duct is formed between the outer surface of the inner shell 4 and the inner surface of the volute 1. , the rear guide vane structure is arranged in the annular air duct. The inner shell 4 is used to further define the air passage in the volute 1 so that the airflow can be better guided by the guide vanes 33 when passing through the rear guide vane structure.

As another embodiment, the rear guide vane structure includes a plurality of guide vanes 33 , the first edge of the guide vanes 33 is fixed to the outer surface of the inner shell 4 , and the second edge of the guide vanes 33 is fixed to the inner surface of the volute 1 set up. At this time, the guide vane 33 is fixedly arranged between the volute 1 and the inner shell 4. The rear guide vane structure is used to increase the fixing strength between the volute 1 and the inner shell 4 to achieve the effect of reinforcing ribs.

In some embodiments of the present disclosure, the expansion angle of the rear guide vane structure ranges from 10° to 40°. The expansion angle refers to the angle formed between the line connecting the leading edge and trailing edge of the rear guide vane structure and the center line of the rear guide vane structure along the gas flow direction, where the leading edge is the air inlet of the rear guide vane structure. The trailing edge is the air outlet end of the rear guide vane structure. That is to say, along the flow direction of the gas, the cross-sectional size of the rear guide vane structure gradually increases. When applied to a mixed-flow fan, the flow cross-section when the airflow enters the rear guide vane structure is smaller than the flow cross-section when the airflow flows out of the rear guide vane structure.

In some embodiments of the present disclosure, the outer surface of the volute 1 is a curved surface. That is, the cross-section of the outer surface of the volute is a curved segment.

In some embodiments of the present disclosure, the volute 1 is a truncated sphere, and the maximum diameter of the volute 1 is equal to the diameter of the truncated sphere. That is to say, the volute 1 can rotate freely in a spherical space with a fixed diameter centered on the center of the truncated sphere. When applied to an air duct machine and the air duct machine needs to discharge air up and down, the air duct machine can The mixed-flow fan provided in this application provides a spherical space with a fixed diameter, and the rotation of the mixed-flow fan realizes switching of the air inlet and outlet directions of the air duct machine.

In some embodiments of the present disclosure, the volute 1 is provided with an air inlet and an air outlet 12 at two end surfaces of the truncated sphere respectively.

The above-described embodiments only express several implementation modes of the present disclosure, and their descriptions are relatively specific and detailed, but should not be understood as limiting the patent scope of the present disclosure. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all fall within the protection scope of the present disclosure. Therefore, the protection scope of the patent disclosed should be determined by the appended claims.

Claims

A mixed-flow fan, including:

Volute (1), the volute (1) is provided with an air outlet (12);

Impeller (2), the impeller (2) is arranged in the volute (1);

Rear guide vane structure, the rear guide vane structure is arranged between the air outlet (12) and the impeller (2), and there is a gap (13) between the rear guide vane structure and the impeller (2) , the ratio of the height H of the distance (13) to the impeller height H2 ranges from 0.18 to 0.24.
The mixed flow fan according to claim 1, wherein the rear guide vane structure includes a plurality of guide vanes (33), and all the guide vanes (33) are annularly distributed with the axis of the impeller (2) as an axis.
The mixed flow fan according to claim 2, wherein at least one of the guide vanes (33) is provided with a swing shaft (34), and the axis of the swing shaft (34) is inclined relative to the axis of the impeller (2). , and the guide vane (33) having the swing shaft (34) can swing with the axis of the swing shaft (34) as the axis.
The mixed flow fan according to claim 3, wherein the axis of the swing shaft (34) is inclined by 90° relative to the axis of the impeller (2).
The mixed flow fan according to claim 3, wherein the swing angle α of the guide vane (33) ranges from 0° to 10°.
The mixed flow fan according to any one of claims 1 to 5, wherein the rear guide vane structure is provided with silencer teeth.
The mixed flow fan according to any one of claims 1 to 6, further comprising an inner shell (4), which is disposed between the impeller (2) and the air outlet (12), so The rear guide vane structure is arranged between the outer surface of the inner shell (4) and the inner surface of the volute (1).
The mixed flow fan according to any one of claims 1 to 7, wherein the rear guide vane structure includes a plurality of guide vanes (33), the first edge of the guide vanes (33) and the inner shell (4) The outer surface of the guide vane (33) is fixedly arranged on the inner surface of the volute (1).
The mixed flow fan according to any one of claims 1 to 8, wherein the expansion angle of the rear guide vane structure ranges from 10° to 40°.
The mixed flow fan according to any one of claims 1 to 9, wherein the outer surface of the volute (1) is a curved surface.
The mixed flow fan according to any one of claims 1 to 10, wherein the volute (1) is a truncated sphere, and the maximum diameter of the volute (1) is equal to the diameter of the truncated sphere.
The mixed-flow fan according to claim 11, wherein the volute (1) is provided with an air inlet and an air outlet (12) at two end surfaces of the truncated sphere respectively.
An air duct machine includes the mixed flow fan according to any one of claims 1 to 12.