CN114962331A - Mixed flow fan and ducted air conditioner - Google Patents
Mixed flow fan and ducted air conditioner Download PDFInfo
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- CN114962331A CN114962331A CN202210584072.XA CN202210584072A CN114962331A CN 114962331 A CN114962331 A CN 114962331A CN 202210584072 A CN202210584072 A CN 202210584072A CN 114962331 A CN114962331 A CN 114962331A
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- Prior art keywords
- silencing
- flow fan
- mixed flow
- air
- volute
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/403—Casings; Connections of working fluid especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a mixed flow fan and a duct type air conditioner. The mixed flow fan includes: the volute is provided with an air outlet; the diversion cone is arranged at the air outlet, and the airflow of the air outlet flows through the diversion cone; the flow guide cone is internally provided with a first silencing cavity, at least one first silencing hole is formed in the flow guide cone, and the first silencing hole is communicated with the first silencing cavity. According to the mixed flow fan and the air duct machine provided by the invention, the silencing cavity is formed on the guide cone, and the first silencing hole is arranged, so that the air flow flowing through the guide cone can be matched with the first silencing cavity under the action of the first silencing hole to realize the purposes of silencing and noise reduction, and the noise of the mixed flow fan is reduced.
Description
Technical Field
The invention relates to the technical field of air treatment equipment, in particular to a mixed flow fan and a duct type air conditioner.
Background
The air duct machine is one of air conditioners, in order to improve the comfortableness, some air duct machines adopt an upper cold air outlet mode and a lower hot air outlet mode, waterfall type refrigeration and carpet type warm air can be realized, in order to realize the air outlet mode, the air outlet of the air duct machine is required to be reversible, in the existing air outlet reversible air duct machine, a cross-flow fan and a centrifugal fan are generally adopted, but the fan is not reversible due to the problem of the setting mode of fan blades, the air direction after the reversal is not reversible, therefore, at least two fans can be arranged, one fan is responsible for forward air outlet, and the other fan is responsible for reverse air outlet, so that the structure of the air duct machine is larger, and the cost is higher.
In order to reduce the cost, the fan needs to be reduced, the mixed flow fan is a fan between the axial flow fan and the centrifugal fan, an impeller of the mixed flow fan enables air to do centrifugal motion and axial motion, and the air flow motion in the volute mixes two motion modes of axial flow and centrifugal motion, so that the mixed flow fan is called mixed flow. Moreover, the mixed flow fan not only can reduce the volume, but also can ensure the flow direction and the wind pressure of the airflow.
The mixed flow fan can produce noise in the working process, especially when the air current flows out of the air outlet of the mixed flow fan, the mixed flow fan in the prior art is not provided with a noise reduction structure to reduce the noise, and only the guide cone is arranged to only play a role in guiding the air outlet of the mixed flow fan, so that the mixed flow fan still has the problem of overlarge noise.
Disclosure of Invention
The embodiment of the invention provides a mixed flow fan and an air duct machine, and aims to solve the problem that the mixed flow fan in the prior art is low in energy efficiency.
A mixed flow fan, comprising:
the volute is provided with an air outlet;
the diversion cone is arranged at the air outlet, and the airflow of the air outlet flows through the diversion cone;
the flow guide cone is internally provided with a first silencing cavity, at least one first silencing hole is formed in the flow guide cone, and the first silencing hole is communicated with the first silencing cavity.
The ratio of the diameter D of the first muffling hole to the radius R of the bottom surface of the flow guide cone ranges from 0.03 to 0.12.
The ratio of the distance H between every two adjacent first silencing holes to the diameter D of each first silencing hole ranges from 1.3 to 4.4.
The distance H between every two adjacent first silencing holes is larger than the diameter D of each first silencing hole.
The mixed flow fan further comprises an inner shell, the inner shell is arranged in the volute, an annular flow channel is formed between the inner shell and the volute, one end of the annular flow channel forms the air outlet, and the flow guide cone is arranged on the inner shell.
A second silencing cavity is formed in the inner shell, and the first silencing cavity is communicated with the second silencing cavity.
And a second silencing hole communicated with the second silencing cavity is formed in the inner shell.
The volute is of a ball table structure, and the maximum diameter of the volute is equal to the diameter of the ball table structure.
The volute is positioned on two end faces of the table structure and is respectively provided with an air inlet and an air outlet.
A tuber pipe machine, includes above-mentioned mixed flow fan.
According to the mixed flow fan and the air duct machine provided by the invention, the silencing cavity is formed on the guide cone, and the first silencing hole is arranged, so that the air flow flowing through the guide cone can be matched with the first silencing cavity under the action of the first silencing hole to realize the purposes of silencing and noise reduction, and the noise of the mixed flow fan is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a mixed flow fan according to an embodiment of the present invention;
fig. 2 is a perspective view of a guide cone according to an embodiment of the present invention;
fig. 3 is a top view of a guide cone according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of an inner casing and a guide vane according to an embodiment of the present invention;
FIG. 5 is a perspective view of an inner casing and vanes of an embodiment provided by the present invention;
in the figure:
1. a volute; 12. an air outlet; 2. a flow guide cone; 21. a first muffling chamber; 22. a first muffling hole; 3. an inner shell; 31. a second muffling chamber; 32. a second muffling hole; 33. a guide vane.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 5, the present invention provides a mixed flow fan, which includes a volute 1, wherein an air outlet 12 is disposed on the volute 1; the diversion cone 2 is arranged at the air outlet 12, and the airflow of the air outlet 12 flows through the diversion cone 2; a first silencing cavity 21 is formed inside the flow guiding cone 2, at least one first silencing hole 22 is formed in the flow guiding cone 2, and the first silencing hole 22 is communicated with the first silencing cavity 21. Through forming the noise reduction cavity on the flow guide cone 2 and arranging the first noise reduction hole 22, the air current flowing through the flow guide cone 2 can be matched with the first noise reduction cavity 21 under the action of the first noise reduction hole 22 to achieve the purposes of noise reduction and noise reduction.
The ratio of the diameter D of the first muffling hole 22 to the bottom radius R of the guide cone 2 ranges from 0.03 to 0.12. Wherein, the bottom surface of the diversion cone 2 is the end surface of the diversion cone 2 connected with the volute 1.
The mixed flow fan of the embodiment is subjected to simulation test, the numerical value of D/R is changed, and the simulation result is as follows:
from the simulation result, when the D/R is 0.06, the air volume and the calculated pressure head do not reach the maximum value at the moment, but the noise at the moment is at the minimum value, when the D/R is increased to 0.12, the air volume and the pressure head start to be reduced, the noise is increased on the contrary, when the D/R is continuously increased to 0.15, the air volume and the calculated pressure head continue to be reduced, the noise reduction effect cannot be achieved, when the D/R is reduced to 0.03, the air volume and the calculated pressure head start to be increased, the noise also starts to be increased, and when the D/R is continuously reduced to 0.01, the air volume and the calculated pressure head can reach the maximum value, but the noise at the moment is overlarge; also when the D/R value is on the small side, explain that the trompil diameter is on the small side, the water conservancy diversion awl surface can be comparatively smooth this moment, and the amount of wind loss is on the small side, but the noise cancelling effect that first noise canceling hole played is limited, and the whole noise of mixed flow fan is on the large side. When the D/R value is bigger, the diameter of the opening is bigger, the surface of the diversion cone is rough, the air quantity loss is bigger, the silencing effect of the silencing hole is hard to embody, and the integral noise of the unit is bigger. When the D/R value is within the optimal value (0.03-0.12), the air column can vibrate at a moderate frequency, the surface smoothness of the flow guide cone is moderate, the air volume loss is small, and the purpose of low noise is achieved.
The ratio of the distance H between every two adjacent first silencing holes to the diameter D of each first silencing hole ranges from 1.3 to 4.4. When the curved surface exists on the flow guide cone, the distance H refers to the distance between the projections of two adjacent first silencing holes on the installation plane of the flow guide cone.
The mixed flow fan of the embodiment is subjected to simulation test, the numerical value of H/D is changed, and the simulation result is as follows:
from the simulation result, when the H/D is 3, the air volume and the calculated pressure head do not reach the maximum value at the moment, but the noise at the moment is at the minimum value, when the H/D is reduced to 1.3, the air volume and the pressure head start to be reduced, the noise is increased on the contrary, when the H/D is continuously reduced to 1.2, the air volume and the calculated pressure head continue to be reduced, the noise is continuously increased, the noise reduction effect cannot be achieved, when the H/D is increased to 4.4, the air volume and the calculated pressure head start to be increased, the noise also starts to be increased, and when the H/D is continuously increased to 5.0, the air volume and the calculated pressure head can reach the maximum value, but the noise at the moment is also overlarge; that is, when the value of H/D is bigger, the number of holes is less (sparse), the surface of the flow guide cone is smoother, the air volume is bigger, but the noise reduction level is limited. When the value of H/D is less, the trompil figure is more (intensive this moment), and the water conservancy diversion awl surface is more crude, and the amount of wind is less, and the roughness on surface can make near the water conservancy diversion awl produce unstable turbulent flow, also can influence the noise reduction effect. When the H/D value is in a proper stage (1.3-4.4), the smoothness of the surface of the guide cone can be ensured, and the noise reduction effect can be ensured.
The distance H between every two adjacent first silencing holes is larger than the diameter D of each first silencing hole.
Preferably, the distance H between two adjacent first muffling holes 22 ranges from 3mm to 10 mm. The diameter D of the first muffling hole 22 ranges from 1mm to 4 mm.
The mixed flow fan further comprises an inner shell 3, the inner shell 3 is arranged in the volute 1, an annular flow channel is formed between the inner shell 3 and the volute 1, one end of the annular flow channel forms the air outlet 12, and the guide cone 2 is arranged on the inner shell 3. Utilize inner shell 3 to install the impeller of mixed flow fan and driving motor thereof, utilize annular flow channel to carry out the water conservancy diversion of certain degree to impeller combustion air simultaneously, make the air current of air outlet 12 department can assemble same department after discharging, thereby guarantee the air-out effect of mixed flow fan, set up water conservancy diversion awl 2 on inner shell 3 simultaneously, can utilize water conservancy diversion awl 2 further water conservancy diversion to the air current in the annular flow channel, avoid multi-directional air current to assemble the back and produce the condition such as vortex, guarantee the air-out effect of mixed flow fan.
A second muffling cavity 31 is formed in the inner shell 3, and the first muffling cavity 21 is communicated with the second muffling cavity 31. The space of the first silencing cavity 21 is increased by arranging the second silencing cavity 31, so that the silencing capacity of the first silencing cavity 21 is increased, and the noise of the mixed flow fan is effectively reduced.
The inner shell 3 is provided with a second silencing hole 32 communicated with the second silencing cavity 31, the second silencing hole 32 is used for silencing air flow in the annular flow channel, noise in a first frequency range is reduced, and the second silencing hole and the air flow flowing through the flow guide cone 2 are silenced by the first silencing hole 22, so that the frequency range of silencing is increased under the common cooperation of noise reduction of the noise in a second frequency range, and further the noise of the mixed flow fan is further reduced.
The guide vane 33 is arranged in the annular flow passage, and the guide vane 33 can guide the air flow (the air outlet of the impeller) in the annular flow passage, so that the air outlet effect of the mixed flow fan is improved.
The diameter d of the second muffling hole 32 is 0.05 to 0.2 times the height h of the guide vane 33. The height H of the guide vane 33 refers to the size of the guide vane in the axial direction of the impeller 2, the guide vane 33 may be determined according to the size of the inner casing 4, and under the condition that the volume of the second muffling chamber 31 is guaranteed to be unchanged, the higher the height of the inner casing 3 is, the larger the height H of the guide vane 33 is, the smaller the maximum diameter of the inner casing 3 is, the smaller the resistance of the air duct in the volute 1 to the air flow is, and conversely, the smaller the height of the inner casing 3 is, the smaller the height H of the guide vane 33 is, the larger the maximum diameter of the inner casing 3 is, and the larger the resistance of the air duct in the volute 1 to the air flow is.
The mixed flow fan of the embodiment is subjected to simulation test, and under the condition that the diameter D of the first muffling hole and the distance H between the first muffling holes are kept unchanged, the range of D/H is changed, so that the simulation result is as follows:
from the above results, when d/h is 0.12, the air volume reaches the maximum value, the internal power and the noise reach the minimum value, when d/h is increased to 0.20, the air volume starts to decrease, the internal power and the noise start to increase, when d/h is continuously increased to 0.22, the air volume continues to decrease, the internal power and the noise continue to increase, namely, the d/h continues to increase and is not beneficial to the air volume and the noise of the mixed flow fan; when d/h is reduced to 0.05, the air volume begins to be reduced, the internal power and the noise begin to increase, when d/h continues to be reduced to 0.01, the air volume continues to be reduced, the internal power and the noise still increase, namely when the value of d/h is larger, the noise reduction effect on the mixed flow fan is not good, and when the diameter of the second muffling hole 32 is too large or the height of the guide vane 33 is smaller, the smooth degree of an air duct in the volute 1 can be affected, the flowing of air is not facilitated, and on the contrary, extra noise can be caused, but when the diameter of the second muffling hole 32 is too small, the second muffling hole 32 cannot generate the noise reduction effect on the air flow, so that the noise reduction effect of the mixed flow fan can be better realized by selecting a proper value of d/h.
The volute 1 is of a ball table structure, and the maximum diameter of the volute 1 is equal to the diameter of the ball table structure. That is, spiral case 1 can carry out the free rotation in the fixed spherical space of diameter with the centre of sphere of ball platform structure as the center, when being applied to tuber pipe machine and tuber pipe machine demand when going out wind from top to bottom, can provide the fixed spherical space of diameter for the mixed flow fan that this application provided in the tuber pipe machine, realizes the switching of tuber pipe machine business turn over wind direction through the rotation of mixed flow fan.
The volute 1 is provided with an air inlet and an air outlet 12 at two end surfaces of the table structure.
A tuber pipe machine, includes above-mentioned mixed flow fan.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a mixed flow fan which characterized in that: the method comprises the following steps:
the air conditioner comprises a volute (1), wherein an air outlet (12) is formed in the volute (1);
the diversion cone (2) is arranged at the air outlet (12), and the airflow of the air outlet (12) flows through the diversion cone (2);
a first silencing cavity (21) is formed inside the diversion cone (2), at least one first silencing hole (22) is formed in the diversion cone (2), and the first silencing hole (22) is communicated with the first silencing cavity (21).
2. The mixed flow fan of claim 1, wherein: the ratio of the diameter D of the first silencing hole (22) to the radius R of the bottom surface of the flow guide cone ranges from 0.03 to 0.12.
3. The mixed flow fan of claim 1, wherein: the ratio of the distance H between two adjacent first silencing holes (22) to the diameter D of the first silencing holes (22) ranges from 1.3 to 4.4.
4. The mixed flow fan of claim 1, wherein: the distance H between every two adjacent first silencing holes (22) is larger than the diameter D of the first silencing holes (22).
5. The mixed flow fan of claim 1, wherein: the mixed flow fan further comprises an inner shell (3), the inner shell (3) is arranged in the volute (1), an annular flow channel is formed between the inner shell (3) and the volute (1), one end of the annular flow channel forms the air outlet (12), and the flow guide cone (2) is arranged on the inner shell (3).
6. The mixed flow fan of claim 5, wherein: a second silencing cavity (31) is formed in the inner shell (3), and the first silencing cavity (21) is communicated with the second silencing cavity (31).
7. The mixed flow fan of claim 6, wherein: and a second silencing hole (32) communicated with the second silencing cavity (31) is formed in the inner shell (3).
8. The mixed flow fan of claim 1, wherein: the volute (1) is of 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 of claim 8, wherein: the volute (1) is positioned on two end faces of the table structure and is respectively provided with an air inlet and an air outlet (12).
10. A ducted air conditioner characterized in that: comprising a mixed flow fan according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210584072.XA CN114962331A (en) | 2022-05-27 | 2022-05-27 | Mixed flow fan and ducted air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210584072.XA CN114962331A (en) | 2022-05-27 | 2022-05-27 | Mixed flow fan and ducted air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114962331A true CN114962331A (en) | 2022-08-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210584072.XA Pending CN114962331A (en) | 2022-05-27 | 2022-05-27 | Mixed flow fan and ducted air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114962331A (en) |
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2022
- 2022-05-27 CN CN202210584072.XA patent/CN114962331A/en active Pending
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