CN115492792A - Centrifugal wind wheel, centrifugal fan and air conditioner - Google Patents
Centrifugal wind wheel, centrifugal fan and air conditioner Download PDFInfo
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- CN115492792A CN115492792A CN202110679805.3A CN202110679805A CN115492792A CN 115492792 A CN115492792 A CN 115492792A CN 202110679805 A CN202110679805 A CN 202110679805A CN 115492792 A CN115492792 A CN 115492792A
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- 238000009434 installation Methods 0.000 claims abstract description 17
- 238000005452 bending Methods 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000004378 air conditioning Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 abstract description 14
- 230000000694 effects Effects 0.000 description 16
- 230000001965 increasing effect Effects 0.000 description 8
- 230000003068 static effect Effects 0.000 description 5
- 230000002708 enhancing effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003245 working effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000000465 moulding Methods 0.000 description 1
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Classifications
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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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
- F04D17/162—Double suction 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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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
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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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
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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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
- F24F1/0022—Centrifugal or radial 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 discloses a centrifugal wind wheel, a centrifugal fan and an air conditioner, wherein the centrifugal wind wheel comprises a wheel disc, a guide fan blade and a centrifugal fan blade, at least one side of the wheel disc is an installation side, the guide fan blade is arranged on the installation side and comprises a plurality of guide blades which are distributed at intervals along the circumferential direction of the wheel disc, each guide blade extends along the direction from the middle part to the periphery of the wheel disc, the centrifugal fan blade is arranged on the installation side and comprises a plurality of centrifugal blades which surround the periphery of the guide fan blade and are distributed at intervals, and each centrifugal blade extends along the axial direction. In the invention, the guide fan blade plays a role in guiding, improves the flow field of the air inlet area of the centrifugal wind wheel, inhibits the phenomenon of air flow separation of the suction surface of the centrifugal fan blade, reduces flow loss of the flow field caused by air inlet distortion, improves the air supply efficiency of the centrifugal wind wheel, improves the air volume at the same rotating speed, and reduces the noise value at the same air volume. And, when the air quantity demand of the air conditioner is satisfied, the diameter of the centrifugal wind wheel can be reduced, and the overall size of the air conditioner is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a centrifugal wind wheel, a centrifugal fan and an air conditioner.
Background
The existing indoor unit of the air conditioner mostly adopts a centrifugal fan which is often arranged in a heat exchange air duct and used for driving airflow to flow along the heat exchange air duct.
The ideal air inlet direction of the centrifugal fan is the axial direction of the rotating shaft, and the ideal air outlet direction is the radial direction of the rotating shaft. However, due to the limitation of the installation condition of the air conditioner, the actual air inlet of the heat exchange air duct is generally located in the radial direction of the centrifugal fan, so that the actual air inlet direction and the ideal air inlet direction of the centrifugal fan generally form an included angle of nearly 90 degrees, the distortion of the air inlet flow is caused, the air flow loss is increased, the air supply efficiency of the centrifugal fan is reduced, and the noise is increased.
Disclosure of Invention
The invention mainly aims to provide a centrifugal wind wheel, a centrifugal fan and an air conditioner, aiming at improving the air inlet flow field of the existing centrifugal fan, enhancing the air supply efficiency and reducing the noise.
In order to achieve the above object, the present invention provides a centrifugal wind wheel, comprising:
at least one side of the wheel disc is a mounting side;
the guide vane is arranged on the mounting side and comprises a plurality of guide vanes which are distributed at intervals along the circumferential direction of the wheel disc, and each guide vane extends along the direction from the middle part of the wheel disc to the periphery; and the number of the first and second groups,
the centrifugal fan blade is arranged on the mounting side and comprises a plurality of centrifugal blades which surround the periphery of the flow guide fan blade and are distributed at intervals, and each centrifugal blade extends along the axial direction.
In one embodiment, each of the guide vanes is curved toward the same side in the circumferential direction.
In an embodiment, the bending direction of each guide vane is the same as that of each centrifugal vane, the inlet angle of each centrifugal vane is α 1, and the outlet angle of each guide vane is greater than or equal to 170 ° - α 1 and less than or equal to 190 ° - α 1.
In an embodiment, the bending direction of each of the guide vanes is opposite to that of each of the centrifugal vanes, the inlet angle of each of the centrifugal vanes is α 1, and the outlet angle of each of the guide vanes is greater than or equal to α 1-10 ° and less than or equal to α 1+10 °.
In one embodiment, the outer diameter of the centrifugal fan blade is D, and the outer diameter of the flow guide fan blade is greater than or equal to 0.6D and less than or equal to 0.75D; and/or the presence of a gas in the gas,
the maximum size of each centrifugal blade in the axial direction is H, and the maximum size of each guide blade in the axial direction is greater than or equal to 0.4H and less than or equal to 0.6H.
In an embodiment, a hub is convexly disposed in the middle of the mounting side, at least one section of the hub is tapered in a direction away from the mounting side, and each of the guide vanes extends from the peripheral side of the hub to the outer periphery of the wheel disc.
In one embodiment, the hub is tapered from the mounting side to a direction away from the mounting side, and an included angle between the peripheral side of the hub and the mounting side is greater than or equal to 45 ° and less than or equal to 55 °.
In one embodiment, the outer diameter of the centrifugal fan blade is D, and the outer diameter of the end of the hub connected with the mounting side is greater than or equal to 0.4D and less than or equal to 0.5D.
In one embodiment, the hub is disposed in a frustum shape, and an axial hole is formed at an end of the hub away from the mounting side and used for a motor shaft to pass through.
In one embodiment, each of the guide vanes is protruded from the mounting side, and has a root portion connected to the hub and a tip portion away from the hub;
the protruding height of each blade root is H1, the protruding height of the hub is not less than 0.9H1 and not more than 1.1H1, and/or,
the protruding height of each guide vane on the installation side is at least partially gradually reduced from the blade root to the blade tip, the protruding height of each blade root is H1, and the protruding height of each blade tip is not less than 0.4H1 and not more than 0.6H1.
In an embodiment, the centrifugal wind wheel is a double-suction centrifugal wind wheel, and both sides of the wheel disc are the mounting sides.
In order to achieve the above object, the present invention further provides a centrifugal fan, including:
the volute is provided with a centrifugal air duct; and (c) a second step of,
the centrifugal wind wheel is arranged on the centrifugal wind channel.
In order to achieve the above object, the present invention further provides an air conditioner, including the centrifugal fan as described above.
In one embodiment, the air conditioner includes a casing, the casing is formed with a heat exchange air duct, and an air inlet and an air outlet which communicate with the heat exchange air duct, the centrifugal fan is disposed in the heat exchange air duct, the air inlet is located at one radial end of the centrifugal fan, and the air outlet is located at the other radial end of the centrifugal fan.
In one embodiment, the air conditioner is a duct type air conditioner indoor unit.
The invention provides an air conditioner which comprises a centrifugal fan comprising a centrifugal wind wheel, wherein the centrifugal wind wheel comprises a wheel disc, a guide fan blade and a centrifugal fan blade, at least one side of the wheel disc is an installation side, the guide fan blade is arranged on the installation side and comprises a plurality of guide fan blades which are distributed at intervals along the circumferential direction of the wheel disc, each guide fan blade extends along the direction from the middle part to the periphery of the wheel disc, the centrifugal fan blade is arranged on the installation side and comprises a plurality of centrifugal fan blades which surround the periphery of the guide fan blade and are distributed at intervals, and each centrifugal fan blade extends along the axial direction. In the embodiment provided by the invention, the flow guide fan blade plays a flow guide role, improves the flow field of the air inlet area of the centrifugal wind wheel, inhibits the phenomenon of air flow separation of the suction surface of the centrifugal wind wheel caused by the distortion of the inlet air flow to a certain extent, improves the turbulence noise, reduces the flow loss of the flow field in the air conditioner, improves the air supply efficiency of the centrifugal wind wheel, can improve the air volume at the same rotating speed and can reduce the noise value to a certain extent at the same air volume. Moreover, the centrifugal wind wheel structure can reduce the diameter of the centrifugal wind wheel and the size of the centrifugal fan when the air volume requirement of the air conditioner is met, so that the overall size of the air conditioner is reduced.
Drawings
Fig. 1 is a perspective view of an embodiment of an air conditioner provided in the present invention, in which a part of a cabinet is removed;
fig. 2 is a schematic perspective view of the centrifugal wind wheel of fig. 1;
fig. 3 is a schematic perspective view of a hub and a guide vane of the centrifugal wind wheel in fig. 2;
FIG. 4 is a front view of the centrifugal fan of FIG. 1;
FIG. 5 isbase:Sub>A cross-sectional view taken at A-A of FIG. 4;
FIG. 6 is a front view of the centrifugal wind wheel of FIG. 4;
figure 7 is a cross-sectional view of the centrifugal rotor of figure 6;
fig. 8 is a schematic view of a wind guide blade arrangement of the centrifugal wind wheel in fig. 6;
FIG. 9 is a meridian flow surface static pressure cloud chart of a centrifugal fan in the prior art;
fig. 10 is a meridional flow surface static pressure cloud chart of an embodiment of the centrifugal fan provided by the invention.
The reference numbers illustrate:
| reference numerals | Name(s) | Reference numerals | Name (R) |
| 200 | |
12 | Flow guiding |
| 201 | Casing (CN) | 120 | |
| 20 | Heat |
121 | Root of |
| 100 | |
122 | Tip of |
| 10 | |
13 | |
| 15 | |
130 | |
| 150 | |
14 | |
| 11 | |
140 | Shaft hole |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the technical solutions of the embodiments may be combined with each other, but must be implemented by those skilled in the art, and when they exist, they do not fall within the protection scope of the present invention.
The present invention provides an air conditioner 200. The air conditioner 200 may be an integrated air conditioner, a split air conditioner, an outdoor unit of an air conditioner, or an indoor unit of an air conditioner. Specifically, the air conditioner 200 may be any air conditioner 200 that can apply a centrifugal fan, such as a cabinet air conditioner indoor unit, a duct air conditioner indoor unit, or a wall-mounted air conditioner indoor unit. Referring to fig. 1, in the present embodiment, an air conditioner 200 is a duct type air conditioner indoor unit, such as an air duct unit, or an embedded air conditioner indoor unit in a central air conditioner.
Referring to fig. 1, the air conditioner 200 includes a housing 201, a heat exchange air duct 20 is formed in the housing 201, and an air inlet and an air outlet are formed on the housing 201 and are communicated with the heat exchange air duct 20. A centrifugal fan 100 is arranged in the heat exchange air duct 20, the air inlet is located at one end of the centrifugal fan 100 in the radial direction, and the air outlet is located at the other end of the centrifugal fan 100 in the radial direction.
When the air conditioner 200 is installed in a room, its orientation is as shown. The casing 201 of the air conditioner 200 comprises a top wall and a bottom wall which are separately arranged in the up-down direction, a side wall is arranged between the top wall and the bottom wall in an extending mode, the top wall, the bottom wall and the side wall jointly enclose and form the heat exchange air duct 20, and the air outlet is formed in the side wall on the front side of the casing 201. The centrifugal fan 100 drives the airflow to flow into the heat exchange air duct 20 from the air inlet and flow out from the air outlet. Specifically, the radial direction of the centrifugal fan 100 extends substantially along the up-down direction, and the air outlet end of the centrifugal fan 100 is disposed toward the air outlet located at the front side of the casing 201.
Referring to fig. 4 and 5, the centrifugal fan 100 includes a volute 15, a centrifugal air duct 150 is formed in the volute 15, a centrifugal wind wheel 10 is disposed in the centrifugal air duct 150, and when the centrifugal wind wheel 10 is driven to rotate, centrifugal blades in the centrifugal wind wheel 10 drive an airflow flowing in from the air inlet of the casing 201 to enter the centrifugal air duct 150 from an axial direction, and flow out of the centrifugal air duct 150 from a radial direction, and send the airflow out from the air outlet of the casing 201. That is to say, the air inlet end of the centrifugal fan 100 is located at one axial end thereof, and the air outlet end of the centrifugal fan 100 is located at one radial end thereof, that is to say, the ideal airflow direction of the centrifugal fan 100 is axial air inlet and radial air outlet. However, for a general indoor unit of a duct-type air conditioner, due to installation conditions, it is impossible to arrange an air inlet at an end side of the centrifugal fan 100 in the axial direction, and an actual air inlet of the air conditioner 200 is generally arranged at a bottom wall of the casing 201 or at the side wall of the rear side of the casing 201, so that an actual air inlet of the heat exchange air duct 20 is arranged at the other end of the centrifugal fan 100 in the radial direction, that is, an angle of approximately 90 ° with an ideal air inlet direction of the centrifugal fan 100, thereby causing distortion of inlet airflow, increasing airflow flow loss, reducing air supply efficiency of the centrifugal fan 100, and increasing noise.
Referring to fig. 9, fig. 9 shows a meridional flow surface static pressure cloud chart of a duct type air conditioning indoor unit using a conventional centrifugal fan 100, and it can be seen from the diagram that near an air inlet end of a centrifugal air duct 150 of the centrifugal fan 100, there is a relatively significant region backflow, which is caused by intake airflow distortion and causes a relatively large noise at an air inlet of an air conditioner 200, and this noise is caused by airflow separation at a suction surface of a centrifugal blade 130 in the centrifugal fan 100 due to intake airflow distortion, so that an intake airflow flow field of the centrifugal blade in the centrifugal fan 100 is improved, and airflow separation at the suction surface of the centrifugal blade 130 is suppressed, thereby improving flow field flow loss in a heat exchange air duct 20 due to intake distortion, and achieving relatively good technical effects of improving efficiency of the centrifugal fan 100 and reducing noise value.
Therefore, the present invention provides a centrifugal wind wheel 10 and a centrifugal fan 100 comprising the centrifugal wind wheel 10, and aims to improve the internal flow field flow loss caused by airflow distortion in an air conditioner 200, enhance the air supply efficiency, and reduce noise. It can be understood that the centrifugal wind wheel 10 and the centrifugal fan 100 provided by the present invention are not limited to be applied to the duct type indoor unit of an air conditioner with the above structure, and can be also applied to other air conditioners 200 to which the centrifugal fan 100 can be applied, and can also achieve certain technical effects of enhancing air supply efficiency and reducing noise. Especially, the centrifugal wind wheel 10 and the centrifugal fan 100 are applied to the air conditioner 200 in which the actual air inlet direction of the heat exchange air duct 20 and the ideal air inlet direction of the centrifugal fan 100 form an included angle of nearly 90 degrees, so that the intake air flow can be better improved, and the technical effects of enhancing the air supply efficiency and reducing the noise are achieved.
Referring to fig. 2 and 3, the centrifugal wind wheel 10 includes a wheel disc 11, a guide vane 12 and a centrifugal vane, at least one side of the wheel disc 11 is an installation side, the guide vane 12 is disposed on the installation side and includes a plurality of guide vanes 120 spaced apart from each other along the circumferential direction of the wheel disc 11, each guide vane 120 extends along a direction from the middle of the wheel disc 11 to the outer periphery, the centrifugal vane is disposed on the installation side and includes a plurality of centrifugal vanes 130 surrounding the outer periphery of the guide vane 12 and spaced apart from each other, and each centrifugal vane 130 extends along the axial direction.
The specific manner of the wind-guiding blade 12 disposed on the mounting side may be various, for example, the wind-guiding blade may be fixed on the mounting side, and is preferably integrally formed with the wheel disc 11. Therefore, when the centrifugal wind wheel 10 is driven to rotate, the guide wind blades 12 and the wheel disc 11 do not rotate relatively, and rotate synchronously with the wheel disc 11. The guide vane 12 may be rotatably mounted on the mounting side through a transmission structure, that is, when the centrifugal wind wheel 10 is driven to rotate, the guide vane 12 and the wheel disc 11 rotate relatively. Above-mentioned two kinds of mounting means, the former structure is simpler, and the cost is lower to in two kinds of mounting means, water conservancy diversion fan blade 12 all has the water conservancy diversion effect owing to it certainly the shape setting of the middle part of rim plate 11 to the direction extension of periphery to can realize improving the air inlet flow, thereby strengthen the technological effect of air supply efficiency, noise reduction.
In this embodiment, the specific shape and material of the wind-guiding blade 12 are not limited, and the extending direction thereof is from the middle of the wheel disc 11 extends to the peripheral direction, so as to play a role in guiding the incoming air flow which is originally deviated due to the distortion of the incoming air flow to the air suction side of the centrifugal blade located at the periphery of the wind-guiding blade 12, thereby improving the air inlet area of the centrifugal wind wheel 10, reducing the area backflow phenomenon, suppressing the air flow separation phenomenon of the suction surface of the centrifugal blade 130 to a certain extent, improving the turbulence noise, reducing the flow loss of the flow field inside the air conditioner 200, and improving the air supply efficiency of the centrifugal wind wheel 10. Therefore, the centrifugal wind wheel 10 can improve the air volume at the same rotating speed and reduce the noise value to a certain extent at the same air volume. Moreover, as the guide fan blade 12 can do work when rotating, the centrifugal wind wheel 10 structure can reduce the diameter of the centrifugal wind wheel 10 and the size of the centrifugal fan 100 when meeting the air volume requirement of the air conditioner 200, thereby reducing the overall size of the air conditioner 200. This arrangement is particularly advantageous for a ducted air conditioning indoor unit, because the ducted air conditioning indoor unit is usually installed in a ceiling and is sensitive to the dimension in the vertical direction, the centrifugal fan 100 is arranged in the air conditioner 200, and the radial direction of the centrifugal fan 100 is usually arranged in the vertical direction in an extending manner, and the centrifugal wind wheel 10 having the above structure can reduce the dimension of the centrifugal fan 100 in the radial direction, thereby reducing the overall height of the air conditioner 200, reducing the ceiling height, improving the indoor depression caused by the ceiling installation, and improving the use comfort of users. It will be appreciated that, for other types of air conditioners 200, the above-described centrifugal wind wheel 10 structure can also serve to reduce the overall size of the air conditioner 200, so that the air conditioner 200 has a more compact structure and a more beautiful appearance.
In this embodiment, the wheel disc 11 has two sides, and when the centrifugal wind wheel 10 is a common centrifugal wind wheel 10 with air intake from a single side, the side of the wheel disc 11 facing the air inlet of the volute 15 is the installation side. In another embodiment, please refer to fig. 5 and 7, the centrifugal wind wheel 10 is a double-suction centrifugal wind wheel 10, air inlets are formed on both sides of the volute 15, both sides of the wheel disc 11 are the mounting sides, that is, both sides of the wheel disc 11 are provided with the guide fan blades 12 and the centrifugal fan blades. The double-suction centrifugal fan 100 is used for supplying air from two axial ends and discharging air from one radial end, and has a larger air inlet amount compared with the common centrifugal wind wheel 10 with single-side air inlet, so that a larger air supply amount can be provided for the air conditioner 200. Moreover, the noise of the double-suction centrifugal wind wheel 10 caused by the distortion of the intake airflow is more obvious, and in this case, the effect of enhancing the air supply efficiency and reducing the noise of the guide fan blade 12 is more obvious.
On the basis of the above embodiment, the guide vane 12 includes a plurality of guide vanes 120 arranged at intervals in the circumferential direction, and generally, the profiles of the guide vanes 120 are the same or similar. In the present embodiment, referring to fig. 3 and fig. 6, each of the guide vanes 120 is curved toward the same side in the circumferential direction. It should be noted that, in this embodiment, each of the guide vanes 120 is sheet-shaped, a plane in which each of the guide vanes 120 is located extends substantially in the axial direction, and the curved arrangement of each of the guide vanes 120 toward the same side in the circumferential direction means that a projection of a leading edge and/or a trailing edge of each of the guide vanes 120 in the axial direction is arc-shaped and is curved toward one side in the circumferential direction. In an embodiment, the leading edge and the trailing edge of each of the guide vanes 120 are substantially parallel, and it is understood that in other embodiments, the leading edge and the trailing edge of each of the guide vanes 120 may have different extending directions. In the present embodiment, please refer to fig. 3 and fig. 6, the bending directions of the guide vanes 120 are the same, and preferably, the bending angles of the guide vanes 120 are substantially the same.
In this embodiment, the centrifugal fan blade is disposed around the guide fan blade 12, and the shape of each guide fan blade 120 not only radially guides the airflow to the air suction side of the centrifugal fan blade, but also adjusts the air outlet direction of the airflow sent from the air outlet end of the guide fan blade 12 in the circumferential direction by adjusting the bending degree of the guide fan blade 120, so that the air outlet direction of the airflow is matched with the air inlet direction of the centrifugal fan blade. It can be understood that, in order to reduce wind loss and reduce the phenomenon of air flow separation on the suction surface of each centrifugal fan blade, the air outlet direction of the air flow sent out from the air outlet end of each guide vane 120 is preferably matched with the air inlet direction of each centrifugal fan blade 130, so as to better improve the phenomenon of air flow separation on the suction surface of each centrifugal fan blade 130, thereby improving the overall air supply efficiency of the centrifugal fan 100, improving turbulence noise, and reducing noise.
Specifically, the outlet angle of each of the guide vanes 120 determines the air outlet direction of the guide vane 120, and the relationship between the bending direction of the guide vane 120 and the bending direction of the centrifugal vane 130 determines the relationship between the outlet angles of the guide vane 120 and the centrifugal vane 130. For this reason, the following two embodiments are proposed on the basis of the above-described embodiments.
Specifically, referring to fig. 8, in an embodiment, the bending direction of each of the guide vanes 120 is the same as the bending direction of each of the centrifugal vanes 130, and this arrangement enables each of the guide vanes 120 to work simultaneously when the centrifugal wind wheel 10 rotates, so as to increase the air output of the centrifugal fan 100. As shown in fig. 8, the guide vane 120 with solid lines shows the specific shape and arrangement of the guide vane 120 in the present embodiment. In this embodiment, the exit angle of each guide vane 120 is a, and the entrance angle of each centrifugal vane 130 is α 1,a, which is greater than or equal to 170 ° - α 1 and less than or equal to 190 ° - α 1.
In this embodiment, due to the structural arrangement of the guide vane 120, the air outlet direction of the guide vane 120 is substantially the same as the air inlet direction of the centrifugal vane 130, and the deviation is small, so that the air flow in the central area of the centrifugal wind wheel 10 can be smoothly guided to the air outlet gap between two adjacent centrifugal wind wheels through the guide vane 12, and smoothly flow out from the radial direction of the centrifugal wind wheel 10. Through the structure, the wind loss can be effectively reduced, the phenomenon of air flow separation of the suction surface of each centrifugal fan blade is reduced, the turbulence noise is improved, and the noise value is reduced. The flow field of the air inlet area of the centrifugal wind wheel 10 is improved, the area backflow phenomenon is reduced, meanwhile, the guide fan blades 12 do work when the centrifugal wind wheel 10 rotates, the air output of the centrifugal fan 100 can be increased at the same rotating speed, the diameter of the centrifugal wind wheel 10 can be reduced when the centrifugal wind wheel 10 structure meets the air output requirement of the air conditioner 200, and therefore the air conditioner 200 is compact in structure and small in size.
Referring to fig. 8, in another embodiment, the bending direction of each of the guide vanes 120 is opposite to the bending direction of each of the centrifugal vanes 130, so that the centrifugal wind wheel 10 has less power, and saves more energy under the condition that the centrifugal fan 100 has the same air volume. As shown in fig. 8, the dashed guide vane 120 shows a specific shape of one guide vane 120 in this embodiment, and it can be understood that the guide vane 120 should be provided with a plurality of guide vanes 120 and distributed at intervals along the circumferential direction, and other guide vanes 120 are not shown in the figure. In this embodiment, the outlet angle of each guide vane 120 is b, and the inlet angle of each centrifugal vane 130 is α 1,b, which is greater than or equal to α 1-10 °, and less than or equal to α 1+10 °.
In this embodiment, due to the structural arrangement of the guide vane 120, the air outlet direction of the guide vane 120 is substantially the same as the air inlet direction of the centrifugal vane 130, and the deviation is small, so that the air flow in the central area of the centrifugal wind wheel 10 can be smoothly guided to the air outlet gap between two adjacent centrifugal wind wheels through the guide vane 12, and smoothly flow out from the radial direction of the centrifugal wind wheel 10. Through the structure, the wind loss can be effectively reduced, the phenomenon of air flow separation of the suction surface of each centrifugal fan blade is reduced, the turbulence noise is improved, and the noise value is reduced. The flow field of the air inlet area of the centrifugal wind wheel 10 is improved, the area backflow phenomenon is reduced, meanwhile, the guide fan blades 12 do work when the centrifugal wind wheel 10 rotates, the air output of the centrifugal fan 100 can be increased at the same rotating speed, the diameter of the centrifugal wind wheel 10 can be reduced when the centrifugal wind wheel 10 structure meets the air output requirement of the air conditioner 200, and therefore the air conditioner 200 is compact in structure and small in size.
In an embodiment, please refer to fig. 6, an outer diameter of the centrifugal fan blade is D, and an outer diameter of the guide fan blade 12 is D1. Specifically, the outer diameter D of the centrifugal fan blade is the distance between two ends of the centrifugal fan blade which are farthest away in the radial direction. The outer diameter D1 of the guide vane 12 is the distance between the two ends of the guide vane 12 that are farthest away in the radial direction. The outer diameter D1 of the guide fan blade 12 is greater than or equal to 0.6D and less than or equal to 0.75D.
In this embodiment, it can be understood that, since the guide vane 12 is disposed in the inner peripheral area of the centrifugal vane, the outer diameter of the guide vane 12 should be smaller than that of the centrifugal vane, and the larger the outer diameter of the guide vane 12 is, the smaller the distance between the outer periphery of the guide vane 12 and the inner periphery of the centrifugal vane is. When the distance between the two is too large, the guide fan blade 12 cannot play a good guide role, and the effect of improving the regional backflow is not obvious. When the distance between the two is smaller, the airflow separation phenomenon of the guide fan blades 12 is enhanced, so that the wind loss is increased, the air supply efficiency of the centrifugal wind wheel 10 is reduced, and the noise value is increased. In view of the above factors, in this embodiment, the outer diameter D1 of the wind-guiding blade 12 is greater than or equal to 0.6D and less than or equal to 0.75D, and in this range, the size of the wind-guiding blade 12 is within a reasonable range, which not only can play a good role in guiding the wind, but also can avoid an excessively strong phenomenon of self-airflow separation, so that the overall wind supply efficiency of the centrifugal wind wheel 10 is high, and the noise value is small.
In another embodiment, as shown in fig. 7, the maximum dimension of each centrifugal vane 130 in the axial direction is H, and the maximum dimension H1 of each guide vane 120 in the axial direction is greater than or equal to 0.4H and less than or equal to 0.6H. In this embodiment, the maximum dimension H of each centrifugal blade 130 in the axial direction is the maximum protruding height of the centrifugal blade 130 on the mounting side of the wheel disc 11, and the maximum dimension H1 of the guide vane 120 in the axial direction is the distance between two ends of the guide vane 120 that are farthest from each other in the axial direction, in this embodiment, the guide vane 120 is directly protruding from the mounting side, that is, the maximum dimension H1 of the guide vane 120 in the axial direction is the maximum protruding height of each guide vane 120. Since the guide vane 12 is disposed on the inner periphery of the centrifugal vane, the size of the guide vane 120 in the axial direction should be smaller than that of the centrifugal vane 130.
It can be understood that, in this embodiment, the larger the dimension H1 of the guide vane 120 in the axial direction is, the stronger the guiding effect of the guide vane 120 and the work-doing effect of the auxiliary air supply are, and conversely, the less obvious the guiding effect of the guide vane 120 and the work-doing effect of the auxiliary air supply are. And in consideration of the production cost, the smaller the size of the guide vane 120, the lower the production cost of the centrifugal wind wheel 10 as a whole, and the easier the molding. When the maximum dimension H1 of each guide vane 120 in the axial direction is within a range of greater than or equal to 0.4H and less than or equal to 0.6H, on the one hand, a better guide effect and an auxiliary air supply working effect can be achieved, and on the other hand, when the dimension of each guide vane 120 exceeds the range, the guide effect and the auxiliary air supply working effect are not obviously improved. Therefore, in consideration of the above factors, the maximum dimension H1 of the guide vane 120 in the axial direction is greater than or equal to 0.4H and less than or equal to 0.6H, which can achieve the guiding function, the air supply effect and the economic cost of the guide vane 120. The above two embodiments may be implemented separately or in combination.
On the basis of any of the above embodiments, please refer to fig. 2, fig. 5 and fig. 7, in this embodiment, a hub 14 is protruded from the middle of the mounting side of the wheel disc 11, at least one section of the hub 14 is tapered in a direction away from the mounting side, and each of the guide vanes 120 extends from the peripheral side of the hub 14 to the outer periphery of the wheel disc 11.
In this embodiment, the hub 14 has a shape in which the peripheral side thereof is inclined from the center of the disk 11 to the outer periphery, and thus can function as a centrifugal fan for guiding the intake air flow in the central region of the disk 11 to the outer periphery. In addition, in this embodiment, the hub 14 and the guide fan blade 12 jointly play a role in guiding flow, and the work of the guide fan blade 12 is combined, so that the originally intake air flow deviated due to the distortion of the intake air flow is guided to the air suction side of the centrifugal fan blade by the hub 14 and the guide fan blade 12 jointly, thereby improving the flow field of the intake area of the centrifugal wind wheel 10, reducing the area backflow phenomenon, suppressing the air flow separation phenomenon of the suction surface of the centrifugal fan blade 130 to a certain extent, improving the turbulence noise, reducing the flow loss of the flow field inside the air conditioner 200, and improving the air supply efficiency of the centrifugal wind wheel 10. Therefore, the centrifugal wind wheel 10 can improve the air volume at the same rotating speed and reduce the noise value to a certain extent at the same air volume. Moreover, as the guide fan blade 12 can do work when rotating, the centrifugal wind wheel 10 structure can reduce the diameter of the centrifugal wind wheel 10 and the size of the centrifugal fan 100 when meeting the air volume requirement of the air conditioner 200, thereby reducing the overall size of the air conditioner 200.
Further, with reference to fig. 7, the hub 14 is tapered from the mounting side to a direction away from the mounting side, specifically, in the present embodiment, the hub 14 is substantially conical, and an included angle β between the peripheral side of the hub 14 and the mounting side is greater than or equal to 45 ° and less than or equal to 55 °. It can be understood that when the wheel hub 14 week side with the contained angle beta between the installation side with the direction that wheel hub 14 guided the air current is relevant, in above-mentioned value range, wheel hub 14 will the air current that admits air of centrifugal wind wheel 10 is along above-mentioned angle to the periphery the centrifugal fan blade guide, can with guide fan blade 12 plays better water conservancy diversion effect jointly, improves the regional backward flow phenomenon of guide wind wheel because the distortion that admits air causes more obviously.
On the basis of the previous embodiment, please refer to fig. 8, as shown in the figure, the outer diameter of the centrifugal fan blade is D, and the outer diameter D2 of the end of the hub 14 connected with the mounting side is greater than or equal to 0.4D and less than or equal to 0.5D. In the present embodiment, the hub 14 is suitably sized, and each of the guide vanes 120 extends from the peripheral side of the hub 14 to the outer periphery of the hub 14 and continues to extend outward. The inlet airflow between two adjacent guide vanes 120 is guided in the hub 14 area along the axial and radial directions of the wheel disc 11 and the centrifugal fan blade, and then continues to be guided to the air inlet side of the centrifugal fan blade along the radial and circumferential directions. The wind guiding direction is close to the actual air supply direction of the centrifugal wind wheel 10, so that the airflow of the centrifugal wind wheel 10 is smoother. Therefore, the original intake airflow deviated due to intake airflow distortion is guided to the air suction side of the centrifugal fan blade by the hub 14 and the guide fan blade 12 together through the structure, so that the flow field of the air inlet area of the centrifugal wind wheel 10 is improved, the area backflow phenomenon is reduced, the airflow separation phenomenon of the suction surface of the centrifugal fan blade 130 is inhibited to a certain extent, the turbulence noise is improved, the flow loss of the flow field in the air conditioner 200 is reduced, and the air supply efficiency of the centrifugal wind wheel 10 is improved. Therefore, the centrifugal wind wheel 10 can improve the air volume at the same rotating speed and reduce the noise value to a certain extent at the same air volume.
Referring to fig. 3 and fig. 7, in the present embodiment, the hub 14 is disposed in a frustum shape, and a shaft hole 140 is formed at an end of the hub 14 away from the mounting side, and the shaft hole 140 is used for a motor shaft to pass through. Therefore, the transmission structure matched with the motor shaft can be arranged in the central area of the hub 14, the motor shaft can penetrate through the shaft hole 140 and is matched with the transmission structure on the wheel disc 11 to drive the centrifugal wind wheel 10 to rotate, and the structure is reasonable and compact.
It will be appreciated that in the above embodiment, the guide vanes 120 and the hub 14 are preferably integrally formed to facilitate production and installation. In an embodiment, each of the guide vanes 120 protrudes from the mounting side, and has a root portion 121 connected to the hub 14 and a tip portion 122 away from the hub 14, the protruding height of each root portion 121 is H1, and the protruding height of the hub 14 is greater than or equal to 0.9H1 and less than or equal to 1.1H1. Preferably, the height of the root 121 of each guide vane 120 is the same as the height of the hub 14, so as to facilitate the formation, and the two can better perform the cooperative flow guiding function.
In another embodiment, in view of convenience of mold release, the protrusion height of each guide vane 120 on the mounting side is at least partially gradually reduced from the vane root portion 121 to the vane tip portion 122, the protrusion height of each vane root portion 121 is H1, the protrusion height of each vane tip portion 122 is H2, H2 is 0.4H1 or more and 0.6H1 or less, and preferably H2 is 0.5H1. Therefore, the demolding process of the guide vane 120 and the hub 14 is simple, and the yield is high. And so set up, also can play better water conservancy diversion and supplementary effect. The two embodiments described above can be implemented individually or in combination.
Referring to fig. 9 and 10, fig. 9 shows a meridional flow surface static pressure cloud chart of the centrifugal fan 100 in the prior art, and fig. 10 shows a meridional flow surface static pressure cloud chart of the centrifugal fan 100 in the present embodiment. As can be seen from fig. 9, in the vicinity of the air inlet end of the centrifugal duct 150 of the conventional centrifugal fan 100, there is a relatively obvious local backflow phenomenon, which is caused by distortion of the intake airflow and causes relatively large noise at the air inlet of the air conditioner 200, thereby affecting the air output of the air conditioner 200. In fig. 10, the air conditioner 200 using the centrifugal fan 100 provided in this embodiment has an improved internal region backflow phenomenon, so as to reduce adverse effects caused by intake distortion, suppress the air flow separation phenomenon on the suction surface of the centrifugal blade 130 to a certain extent, improve turbulence noise, reduce flow loss in the flow field inside the air conditioner 200, and improve the air supply efficiency of the centrifugal wind wheel 10. Therefore, the centrifugal wind wheel 10 can improve the air volume at the same rotating speed and reduce the noise value to a certain extent at the same air volume.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (15)
1. A centrifugal wind wheel, comprising:
at least one side of the wheel disc is a mounting side;
the guide vane is arranged on the mounting side and comprises a plurality of guide vanes which are distributed at intervals along the circumferential direction of the wheel disc, and each guide vane extends along the direction from the middle part of the wheel disc to the periphery; and the number of the first and second groups,
the centrifugal fan blade is arranged on the mounting side and comprises a plurality of centrifugal blades which surround the periphery of the flow guide fan blade and are distributed at intervals, and each centrifugal blade extends along the axial direction.
2. A centrifugal wind wheel according to claim 1, wherein each of said guide vanes is curved in the circumferential direction toward the same side.
3. A centrifugal wind rotor according to claim 2, wherein the direction of curvature of each of the guide vanes is the same as that of each of the centrifugal vanes, the inlet angle of each of the centrifugal vanes is α 1, and the outlet angle of each of the guide vanes is 170 ° - α 1 or more and 190 ° - α 1 or less.
4. The centrifugal wind wheel according to claim 3, characterized in that the bending direction of each guide vane is opposite to that of each centrifugal vane, the inlet angle of each centrifugal vane is α 1, and the outlet angle of each guide vane is greater than or equal to α 1-10 ° and less than or equal to α 1+10 °.
5. The centrifugal wind wheel according to any of claims 1 to 4, characterized in that the outer diameter of the centrifugal wind wheel is D, and the outer diameter of the flow guide wind wheel is more than or equal to 0.6D and less than or equal to 0.75D; and/or the presence of a gas in the atmosphere,
the maximum size of each centrifugal blade in the axial direction is H, and the maximum size of each guide blade in the axial direction is greater than or equal to 0.4H and less than or equal to 0.6H.
6. A centrifugal wind wheel according to claim 5, wherein the mounting side has a hub protruding from the middle portion thereof, the hub is tapered from the mounting side to at least one section thereof away from the mounting side, and each of the guide vanes extends from the peripheral side of the hub to the outer periphery of the disk.
7. A centrifugal wind wheel according to claim 6, wherein the hub is tapered from the mounting side to a direction away from the mounting side, and the angle between the peripheral side of the hub and the mounting side is 45 ° or more and 55 ° or less.
8. The centrifugal wind wheel according to claim 7, wherein the centrifugal wind wheel has an outer diameter D, and the outer diameter of the end of the hub connected to the mounting side is not less than 0.4D and not more than 0.5D.
9. A centrifugal wind wheel according to claim 8, wherein the hub is formed in a frustum shape, and the end of the hub away from the mounting side is formed with a shaft hole for a motor shaft to pass through.
10. A centrifugal wind wheel according to claim 6, wherein each of the guide vanes is provided to protrude from the mounting side and has a root portion connected to the hub and a tip portion distant from the hub;
the protruding height of each blade root is H1, the protruding height of the hub is not less than 0.9H1 and not more than 1.1H1, and/or,
the protruding height of each guide vane on the installation side is at least partially gradually reduced from the blade root to the blade tip, the protruding height of each blade root is H1, and the protruding height of each blade tip is not less than 0.4H1 and not more than 0.6H1.
11. A centrifugal rotor according to any of claims 1 to 4 and 6 to 10, characterized in that the centrifugal rotor is a double suction centrifugal rotor, and both sides of the rotor disc are the mounting sides.
12. A centrifugal fan, comprising:
the volute is provided with a centrifugal air duct; and the number of the first and second groups,
a centrifugal wind wheel according to any of claims 1 to 11, provided in the centrifugal wind tunnel.
13. An air conditioner characterized by comprising the centrifugal fan as recited in claim 12.
14. The air conditioner according to claim 13, comprising a casing formed with a heat exchange air duct, and an air inlet and an air outlet communicating with the heat exchange air duct, wherein the centrifugal fan is provided in the heat exchange air duct, the air inlet is located at one end of the centrifugal fan in a radial direction, and the air outlet is located at the other end of the centrifugal fan in the radial direction.
15. The air conditioner of claim 14, wherein the air conditioner is a ducted air conditioning indoor unit.
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| CN202110679805.3A CN115492792A (en) | 2021-06-18 | 2021-06-18 | Centrifugal wind wheel, centrifugal fan and air conditioner |
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| CN202110679805.3A CN115492792A (en) | 2021-06-18 | 2021-06-18 | Centrifugal wind wheel, centrifugal fan and air conditioner |
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