CN109306968B - Fan with fan body - Google Patents
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- CN109306968B CN109306968B CN201810749398.7A CN201810749398A CN109306968B CN 109306968 B CN109306968 B CN 109306968B CN 201810749398 A CN201810749398 A CN 201810749398A CN 109306968 B CN109306968 B CN 109306968B
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- 238000000034 method Methods 0.000 claims description 18
- 238000012360 testing method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 101100391172 Dictyostelium discoideum forA gene Proteins 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
-
- 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
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
- F04D29/386—Skewed blades
-
- 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
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/388—Blades characterised by construction
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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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a fan, which comprises a cylindrical shell, a first motor, a second motor, first fan blades, second fan blades and an electric control plate, wherein the first motor is arranged on the cylindrical shell; the two ends of the cylindrical shell are arranged in an open way; the first motor and the second motor are both arranged in the cylindrical shell, and the first motor and the second motor are coaxially arranged; the first motor is provided with a first rotating shaft, the first rotating shaft extends along the axial direction of the cylindrical shell, the second motor is provided with a second rotating shaft, the first fan blade is arranged on the first rotating shaft, and the second fan blade is arranged on the second rotating shaft; the electric control board is electrically connected with the first motor and the second motor so as to control the first fan blade and the second fan blade to emit air in the same direction. According to the technical scheme, noise can be reduced on the premise of ensuring the air output.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a fan.
Background
The electric fans can be divided into ceiling fans, desk fans, floor fans, wall fans, ventilation fans, air-conditioning fans and the like according to different functions and forms; the air inlet and outlet modes can be divided into axial fans, cross-flow fans, centrifugal fans, cross-flow fans and the like. The axial flow fan comprises a barrel fan with a barrel-shaped outer frame, the air outlet flow of the barrel fan dissipates slowly relative to other types of fans, the air supply distance is far, and the air flow is large. In general, the barrel fan can be used for ventilating fans in small and medium-sized warehouses or places with larger indoor areas, or scenes needing long air supply distance and large air supply amount, such as exhaust ventilation or air supply for indoor small-sized stadiums. However, the current barrel fan requires a relatively high rotational speed of the motor to maintain a relatively large air supply volume, and thus generates relatively large noise.
Disclosure of Invention
The invention mainly aims to provide a fan, which aims to solve the problem that the conventional barrel fan generates larger noise when the air supply amount is larger.
In order to achieve the above purpose, the fan provided by the invention comprises a cylindrical shell, a first motor, a second motor, first fan blades, second fan blades and an electric control board; the two ends of the cylindrical shell are arranged in an open way; the first motor and the second motor are both arranged in the cylindrical shell, and the first motor and the second motor are coaxially arranged; the first motor is provided with a first rotating shaft, the first rotating shaft extends along the axial direction of the cylindrical shell, the second motor is provided with a second rotating shaft, the first fan blade is arranged on the first rotating shaft, and the second fan blade is arranged on the second rotating shaft; the electric control board is electrically connected with the first motor and the second motor so as to control the first fan blade and the second fan blade to emit air in the same direction.
Preferably, the torsion directions of the first fan blade and the second fan blade are the same, and the first motor and the second motor rotate in the same direction.
Preferably, the torsion directions of the first fan blade and the second fan blade are opposite, and the first motor and the second motor rotate relatively.
Preferably, the electric control board comprises a rotation speed ratio adjusting module and a steering adjusting module; the rotation speed ratio adjusting module is used for adjusting and fixing the ratio of the rotation speeds of the first motor to the second motor, and the steering adjusting module is used for switching the rotation directions of the first motor and the second motor.
Preferably, the steering adjustment module includes a protection switch to switch off the steering adjustment module when the first motor and the second motor are operated.
Preferably, the electric control board further comprises a gear adjusting module, wherein the gear adjusting module comprises an editor capable of editing gears and a memory; the gear adjusting module further comprises a plurality of preset gear selection keys and at least one custom gear selection key.
Preferably, the number of the blades of the first fan blade is n 1 The number of the blades of the second fan blade is n 2 The method comprises the steps of carrying out a first treatment on the surface of the The torsion angle of the first fan blade is theta 1 The torsion angle of the second fan blade is theta 2 The method comprises the steps of carrying out a first treatment on the surface of the The angular velocity of the rotation of the first fan blade is omega 1 The angular velocity of the second fan blade is omega 2 The method comprises the steps of carrying out a first treatment on the surface of the Defining the product of the ratio of the number of the blades of the first fan blade to the number of the blades of the second fan blade, the ratio of the torsion angle of the first fan blade to the torsion angle of the second fan blade and the ratio of the angular speed of the first fan blade to the angular speed of the second fan blade as a first difference coefficient, then the first difference coefficientThe first difference coefficient k 1 ∈[0.6,1.67]。
Preferably, the first coefficient of difference k 1 ∈[0.8,1.25]。
Preferably, the total blade area of the first blade is S 1 The total blade area of the second fan blade is S 2 The method comprises the steps of carrying out a first treatment on the surface of the Defining a second difference coefficient as the product of the ratio of the total area of the first fan blade to the total area of the second fan blade and the first difference coefficient, and then the second difference coefficientAnd k is 2 ∈[0.8，1.25]。
Preferably, the length of the first fan blade is l 1 The blade length of the second fan blade is l 2 The method comprises the steps of carrying out a first treatment on the surface of the The first fan blade and the first fan bladeThe distance between the two fan blades is LAnd->
Preferably, the fan further comprises a third fan blade, and the third fan blade is mounted on the first rotating shaft.
Preferably, the third fan blade is arranged at the outer side of the first fan blade, and the length of the third fan blade is smaller than that of the first fan blade.
Preferably, the fan further comprises a fourth fan blade, and the fourth fan blade is installed on the second rotating shaft.
Preferably, the fourth fan blade is disposed between the first fan blade and the second fan blade, and the length of the fourth fan blade is smaller than that of the second fan blade.
According to the technical scheme, the double motors are adopted to drive the double fan blades to discharge air in the same direction, so that the rotating speed of the fan blades can be reduced while the larger air output of the barrel fan is maintained, and the larger noise generated by the high-speed rotation of the fan blades is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a fan according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an embodiment of a fan according to the present invention;
FIG. 3 is a schematic view illustrating an internal structure of a fan according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a motor and a fan according to another embodiment of the present invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 100 | Shell body | 301 | Second rotating shaft |
| 200 | First motor | 302 | Second fan blade |
| 201 | First rotating shaft | 400 | Third fan blade |
| 202 | First fan blade | 500 | Fourth fan blade |
| 300 | Second motor |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments 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 a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The axial flow fan adopts a mode that the motor drives inclined blades fixed on the rotating shaft of the motor to rotate, so that air is driven towards the axial direction of the motor. The barrel fan is one of the axial fans, and the barrel casing with two ends open is a significant difference in the shape and structure of the barrel fan from other axial fans. The air output of the barrel fan is larger than that of other axial fans such as a floor fan, a desk fan and the like, and the barrel fan is often used for an exhaust fan of a small warehouse or an indoor place with a large area, or a place with a large air supply distance or large air supply amount. In order to ensure a larger air outlet flow, the barrel fan usually adopts a high-speed motor, so that the generated noise is far higher than that of other household axial flow fans.
The standard fan is used as a research object to compare the wind outlet capacity and noise control of the single fan blade and the double fan blades, and the specific steps are as follows:
the floor fan of the American FS40-12DR is used as an object to carry out the wind volume typhoon speed detection test, and the maximum wind outlet speed of the American FS40-12DR is about 4m/s basically the same as other floor fans. The fan is turned on, the highest gear is adjusted, the air quantity table is placed at different distances in front of the axis of the fan, the air speed is detected, and the data are as follows:
| distance (m) | 1 | 2 | 3 | 4 | 5 |
| Wind speed (m/s) | 3.85 | 2.47 | 1.65 | 0.75 | 0.6 |
From experimental data, the fan decays to be nonlinear, the higher the speed is, the faster the fan decays, the decaying is to be 1.65m/s at 3m, and the human body feels that the wind needs to be at about 1.6 m/s.
From the test data, it can be concluded that the effective air supply distance of the common floor fan is about 3m, which is consistent with the experience in daily use.
Generally, the effective air supply distance of 3m can meet the requirements of most application scenes, but noise generated when the axial fan of the floor fan is started to a high gear is larger. Gear and noise comparison tests were also performed with "American FS40-12DR" (higher gear the higher wind speed). The American FS40-12DR has better control of mechanical noise in the similar products, and almost no noise is generated by mechanical vibration or friction of parts in operation, so that the detected noise can be considered to be all the noise generated when the fan blades blow the air flow. FS40-12DR has three gear steps, and the noise level corresponding to each gear step is detected two meters from the fan, as follows:
| gear position | 1 | 2 | 3 |
| Noise (decibel) | 36.3 | 43.2 | 53.8 |
The noise in the daytime exceeds 50 db, and the noise in the night exceeds 45 db, which can interfere with normal sleep and rest. According to the sound environment quality standard, the requirements of the class 0 sound environment area (particularly the areas needing silence such as rehabilitation areas) are that the noise in the daytime is not more than 50 dB and the noise in the night is not more than 40 dB; the requirement of the 1-class sound environment area (mainly including residential houses, medical health, cultural education, scientific design and administrative office, and the area needing to keep quiet) is that the noise in the daytime is not more than 55 db and the noise in the night is not more than 45 db.
Therefore, when the conventional floor fan is used at night, the noise generated under the condition of the maximum gear position can obviously influence sleeping and resting. Even in daytime, the noise generated by transmission under the condition of the maximum gear does not meet the requirements of the class 0 sound environment area.
The noise of the barrel fan under normal operation is higher than that of the floor fan, and the noise can cause serious interference to the surrounding.
Therefore, the conventional single-motor single-blade structure floor fan and the conventional single-motor single-blade structure barrel fan cannot ensure sufficient effective air supply distance on the premise of keeping sufficient silence.
For this reason, the present invention proposes a fan, referring to fig. 1 to 3, the fan of the present invention includes a cylindrical housing 100, a first motor 200, a second motor 300, a first fan blade 202, a second fan blade 302, and an electric control board; the two ends of the cylindrical shell 100 are arranged in an open way; the first motor 200 and the second motor 300 are both installed in the cylindrical housing 100, and the first motor 200 and the second motor 300 are coaxially disposed; the first motor 200 has a first rotating shaft 201, the first rotating shaft 201 extends along the axial direction of the cylindrical shell, the second motor 300 has a second rotating shaft 301, the first fan blade 202 is mounted on the first rotating shaft 201, and the second fan blade 302 is mounted on the second rotating shaft 301; the electric control board is electrically connected to the first motor 200 and the second motor 300, so as to control the first fan blade 202 and the second fan blade 302 to exhaust air in the same direction.
The first motor 200 drives the first fan blade 202 to rotate, the second motor 300 drives the second fan blade 302 to rotate, and when the torsion directions of the first fan blade 202 and the second fan blade 302 are the same, the electric control board controls the first motor 200 and the second motor 300 to rotate in the same direction in order to make the first fan blade 202 and the second fan blade 302 exhaust air in the same direction. In addition, the twisting directions of the first fan blade 202 and the second fan blade 302 may be set opposite, and at this time, in order to make the first fan blade 202 and the second fan blade 302 exhaust air in the same direction, the electric control board controls the first motor 200 and the second motor 300 to rotate in opposite directions.
Noise is generated by high-speed rotation of the fan blades, and the rotation speed of the fan blades can be reduced on the premise of ensuring the total amount of the air outlet by adopting the two fan blades to realize the same-direction air outlet, so that the noise is reduced.
The cylindrical shell 100 of the cylindrical fan has a certain rectifying effect on the airflow, and larger noise is generated when the cylindrical shell 100 rectifies and the blades rotate at a high speed, but the noise generated by the vibration of the structural body of the cylindrical fan is basically eliminated for reducing the noise of the cylindrical fan at present, and the noise generated when the cylindrical fan works is basically all sourced from the fan blade driving air and the rectification of the airflow by the cylindrical shell 100. The noise of the barrel fan is obviously reduced when the rotating speed of the fan blade is reduced, but the air output of the barrel fan is obviously reduced when the rotating speed of the fan blade is reduced, so that the barrel fan loses use value.
The two open ends of the cylindrical housing 100 of the barrel fan are an air inlet and an air outlet, respectively, and the first fan blade 202 is located at one side of the air outlet, and the second fan blade 302 is located at one side of the air inlet.
When the airflow generated by the rotation of the second fan blade 302 flows through the first fan blade 202, the airflow has axial momentum and also has axial momentum in the direction perpendicular to the axial direction, under the action of the cylindrical shell 100, a component perpendicular to the axial direction rotates in the cylinder to form circumferential rotational inertia, and the circumferential rotational inertia changes in direction under the rebound action of the first fan blade 202 and becomes the axial momentum mainly. Under the condition that the torsion directions and the rotation directions of the first fan blade 202 and the second fan blade 302 are opposite, the aim of converting the rotational inertia into the axial momentum to the greatest extent can be achieved by controlling the relation between the rotation speeds and the torsion angles of the first fan blade 202 and the second fan blade 302.
The airflow driven by the fan blades has larger disturbance, and all parameters of the fan blades are fixed, so that in actual conditions, the first fan blade 202 cannot fully convert the rotational inertia of the airflow driven by the second fan blade 302 into axial momentum, but the actual maximum conversion effect can be realized through parameter setting, namely, the effect of improving the axial wind outlet capacity to the greatest extent can be achieved through setting specific parameters of the first fan blade 202 and the second fan blade 302.
The ratio between the axial wind force and the vertical axial component generated after the axial component of the airflow driven by the second fan blade 302 is driven by the first fan blade 202 is related to the torsion angle of the blades of the first fan blade 202, and the smaller the torsion angle is, the smaller the ratio is, but at the same time, the smaller the driving effect of the first fan blade 202 on the airflow is.
Factors influencing the wind-out capacity of the axial-flow fan comprise a rotating speed omega, a blade length L, the total area S of blades of the blades, the number n of the blades and the blade torsion angle theta of the blades, and for a single-blade axial-flow fan, the above-mentioned factors are basically in positive correlation with the wind-out capacity, but for a double-blade barrel fan, the proportion of the above-mentioned factors and the distance L between the two blades can also have obvious influence on the wind-out capacity of the barrel fan.
In order to study the relation among factors influencing the fan-out capability of the barrel, a series of tests are designed by adopting a reduced element substitution method on the basis of adopting a control variable method, and the method comprises the following specific steps:
considering that the relationship among the number of blades, the torsion angle and the rotating speed of the two blades has a great influence on the proportion between the axial component and the component perpendicular to the axial direction when the barrel fan finally outputs air, a first difference coefficient k is defined 1 Is the product of the ratio of the number of the blades of the first fan blade 202 to the number of the blades of the second fan blade 302, the ratio of the torsion angle of the first fan blade 202 to the torsion angle of the second fan blade 302, and the ratio of the rotation speed of the first fan blade 202 to the rotation speed of the second fan blade 302; defining a second coefficient of difference k 2 Is the product of the ratio of the total area of the first fan blade 202 to the total area of the second fan blade 302 and the first coefficient of difference; wherein, the torsion angle of the first fan blade 202 is θ 1 The torsion angle of the second fan blade 302 is θ 2 The method comprises the steps of carrying out a first treatment on the surface of the The number of the first fan blades 202 is n 1 The number of blades of the second fan blade 302 is n 2 The method comprises the steps of carrying out a first treatment on the surface of the The total blade area of the first fan blade 202 is S 1 The total blade area of the second fan blade 302 is S 2 The method comprises the steps of carrying out a first treatment on the surface of the The length of the first blade 202 is l 1 The blade length of the second fan blade 302 is l 2 The method comprises the steps of carrying out a first treatment on the surface of the The distance between the first fan blade 202 and the second fan blade 302 is L; then:
the first difference coefficient
The second difference coefficient
A first group: at k 1 As the sole variable
| k 1 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 | 1.3 |
| Air output (m) 3 /h) | 922 | 975 | 992 | 1037 | 1086 | 1100 | 1061 | 995 | 964 |
| Distance of air supply (m) | 9 | 10 | 10.5 | 11 | 11 | 12 | 10.5 | 10 | 9 |
Second group: at k 2 As the sole variable
| k 2 | 0.6 | 0.7 | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 |
| Air output (m) 3 /h) | 979 | 998 | 1042 | 1106 | 1110 | 1092 | 1001 |
| Distance of air supply (m) | 9.5 | 10 | 11 | 11 | 12 | 10.5 | 9.5 |
Third group: to be used forAs the sole variable
Fourth group: to be used forAs the sole variable
Fifth group: to be used forAs the sole variable
In the above five tests, when a unique variable is taken, the parameters of the variable are floated up and down but the variable is kept unchanged, e.g. k is taken in the first test 1 For the sole variable as an example, hold k 1 Unchanged, increaseAt the same time reduce->HoldingUnchanged, multiple groups of experiments were performed to exclude k 1 Abnormal data when the variation of each parameter is large is taken as an average value of a plurality of groups of tests with high consistency.
From the five groups of tests, it can be obtained that, for the barrel fan, the air supply distance and the air output are approximately in direct proportion. And can derive eachA self preferred interval of values in which the first coefficient of difference k 1 The preferred interval of the value of (2) is [0.6,1.2]]And the optimal value interval is [0.8,1.2 ]]The method comprises the steps of carrying out a first treatment on the surface of the Second coefficient of difference k 2 The preferred interval of the value is [0.8,1.1 ]]；The preferred interval of the value is [0.8,1.2 ]]；/>The preferred interval of the value is [0.8,1.1 ]]；/>The preferred interval of the value is [0.4,1.2 ]]。
The electric control board comprises a rotation speed ratio adjusting module and a steering adjusting module; wherein the rotation speed ratio adjusting module is used for adjusting and fixing the rotation speed ratio of the first motor 200 to the second motor 300, and the steering adjusting module is used for switching the rotation directions of the first motor 200 and the second motor 300.
The steering adjusting module is provided with two adjusting modes, one is a forward rotating mode, the other is a reverse rotating mode, the fan outputs air positively in the forward rotating mode, and the fan outputs air reversely in the reverse rotating mode; the steering adjustment module comprises an adjusting switch and a protection switch, wherein the protection switch is used for cutting off the steering adjustment module when the fan works and preventing the first motor 200 and the second motor 300 from being damaged due to the reverse direction of the operation caused by triggering the steering adjustment switch when the fan works; the steering adjustment switch is used for switching the power supply modes of the first motor 200 and the second motor 300 when the fan stops working so as to control the fan to discharge air in the forward direction or the reverse direction. The protection switch is a normally closed switch, and when the fan works, the protection switch is opened to cut off the power supply of the steering adjusting module; when the fan is powered on and does not work, the protection switch is closed, and the steering adjustment module can work normally.
The fan provided by the invention can realize the switching between the forward air outlet and the reverse air outlet through the direction adjusting module, the test data and the optimal value interval are established in the normal air outlet mode, the air inlet and the air outlet are exchanged when the barrel fan reversely air outlet, and the relation between the first fan blade 202 and the second fan blade 302 is correspondingly exchanged, so in the embodiment, in order to consider the air outlet capacity of the forward air outlet and the air outlet capacity of the reverse air outlet, the optimal value interval and the reciprocal of the maximum and the minimum value of the optimal interval and the optimal interval obtained by the test of the value interval of the first difference coefficient and the second difference coefficient are taken, and the optimal value interval of the reciprocal are taken. For example, the preferred value interval of the first difference coefficient obtained from the above experimental data is [0.6,1.2], the reciprocal of 0.6 is 1.67,1.2 and is 0.83, so the preferred value interval of the first difference coefficient in this embodiment is [0.6,1.67], and similarly, the preferred value interval of the first difference coefficient is [0.8,1.25]; the preferred interval of the second difference coefficient is [0.8,1.25].
The common fan is usually preset with three gears, and the double-motor fan can also be used for presetting gears, specifically, the electric control board in the embodiment comprises a gear adjusting module, and the gear adjusting module comprises an editor and a memory which can edit gears; the gear adjusting module further comprises a plurality of preset gear selection keys and at least one custom gear selection key. The conventional barrel fan only has one air outlet mode, namely a straight air mode which reduces the diffusion of air flow in flowing as far as possible, so that the air flow is kept gathered, and the air flow in the air outlet mode has a small air flow diffusion angle and cannot meet the air consumption requirement when the air flow is required to have a larger diffusion angle.
The fan of the present invention can achieve the adjustment of the air-out air flow from the gathered direct wind mode to the gentle wind mode having a larger divergence angle by adjusting the ratio of the rotational speeds of the first motor 200 and the second motor 300. The gear adjusting module comprises a gear of an air outlet mode besides a conventional gear for controlling the wind speed, wherein the preset gear at least comprises a soft wind mode gear and a straight wind mode gear, and multiple gears of air outlet in the soft wind mode and multiple gears of air outlet in the straight wind mode can be realized by matching with gears of different wind speeds. In addition, the user can use the gear editor to set the self-defined gear, the editable content comprises the total output power and the rotation speed ratio, the editable content is stored in the memory after the editing is finished, and the editable content is associated with the self-defined gear selection key to realize the direct calling selection of the self-defined air outlet mode.
The blades of the fan include a planar blade and a cambered blade, and it should be noted that when the planar blade is adopted, the steering adjustment module changes the steering direction of the motor, the air outlet direction is opposite, and the rotation speed ratio of the first fan blade 202 to the second fan blade 302 is higher than that of the first fan bladeThe influence on the air outlet effect is not directly applicable to the above, and the second fan blade 302 and the first fan blade 202 are replaced by the rotation speed ratio +.>When cambered blades are adopted, the steering of the motor is changed through the steering adjusting module, the air outlet direction is opposite, but the air outlet effect is different from that of a plane blade, the air outlet capacity is improved when the front air outlet is carried out, the air outlet capacity is reduced when the back air outlet is carried out, and other aspects are consistent with the above.
According to the technical scheme of the invention, the motors which rotate in opposite directions are adopted to drive the first fan blade 202 and the second fan blade 302 with opposite blade torsion directions to drive air to axially discharge air, and the electric control board is used for controlling the rotation speeds of the first motor 200 and the second motor 300 to be within a certain ratio range so as to adjust the air discharge mode of the fan, for example, the rotation speed ratio of the first fan blade 202 to the second fan blade 302 is increasedControlled at [0.9,1.0]In the range of (2), the momentum of the air flow perpendicular to the axial direction of the motor can be offset to ensure that the air flow is more gathered, the air output is larger, the air supply distance is longer, so that the rotating speeds of the first motor 200 and the second motor 300 can be reduced on the premise of meeting the requirement of a certain air supply distance, and the noise of the fan during operation is further reduced; the rotation speed ratio of the first fan blade 202 and the second fan blade 302 is +.>When the temperature is controlled within 0.6, the air flow of the air outlet can be dispersed more quickly; through the editor and the memory of the editable gear, the air outlet mode frequently used by the user can be edited and stored, and the air outlet mode is used as the custom gear to be associated with the custom gear key, and after the setting, the user can select the air outlet mode by one key without repeated setting when the user needs to use each time.
The embodiment is a specific embodiment of a fan with double fan blades, and in order to further improve the air supply distance of the fan, the invention also provides another embodiment based on the double fan blades.
Referring to fig. 4, the fan of the present embodiment further includes a third fan blade 400, and the addition of the third fan blade 400 can perform further rectification adjustment on the basis of the dual fan blade pair wind outlet, so as to increase the furthest wind supply distance. Specifically, the third fan blade 400 is mounted on the first rotating shaft 201; the third fan blade 400 is disposed on the other side of the first fan blade 202 opposite to the second fan blade 302, and the blade length of the third fan blade 400 is smaller than the blade length of the first fan blade 202.
The fan blades can change the flow speed and the flow direction of the air flow, the air flow can be secondarily adjusted when the two groups of fan blades are adopted, and the purpose of manually adjusting the air outlet effect is achieved by carrying out specific setting and adjustment on the two groups of fan blades. While the flow of the air flow is hindered by the surrounding air, the boundary of the air flow has larger instability. The air flow can be equivalently divided into an air flow beam central area and an air flow beam boundary area, and compared with the air flow beam central area, the air flow velocity has larger influence on the air supply distance, and the air flow beam boundary area has larger influence on the air supply angle. Therefore, the invention provides an embodiment of adding the rectifying fan blade on the basis of the double fan blades.
The third fan blade 400 is a rectifying fan blade, and the rectifying fan blade is mainly used for adjusting the area proportion and the flow velocity of the central area of the airflow beam, so that the longer air supply distance is obtained by adjusting the range and the proportion of the central area and the boundary area of the airflow beam under the condition that the total power is unchanged.
On the basis of this, in order to improve the stability of the fan during operation and further improve the rectifying capability of the rectifying fan blade, another embodiment of the present invention is provided, where the fan further includes a fourth fan blade 500, and the fourth fan blade 500 is installed on the second rotating shaft 301 and is disposed between the first fan blade 202 and the second fan blade 302. Similarly, the blade length of the fourth blade 500 is smaller than the blade length of the second blade 302. It should be noted that, the third fan blade 400 or the fourth fan blade 500 may be used as the rectifying fan blade alone, or the third fan blade 400 and the fourth fan blade 500 may be disposed at the same time.
The rectifying fan blade is matched with the first fan blade 202 and the second fan blade 302, so that the adjustability of the air flow is stronger, the rectifying fan blade has an additional driving effect on the air flow, the additional driving effect is concentrated in the central area of the air beam, and the area proportion and the flow velocity proportion of the central area and the boundary area of the air flow beam generated by the fan can be adjusted, so that a longer air outlet distance is obtained.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (11)
1. A fan, comprising:
the two ends of the cylindrical shell are arranged in an open mode;
the first motor is mounted on the cylindrical shell and provided with a first rotating shaft, and the first rotating shaft extends along the axial direction of the cylindrical shell;
the first fan blade is arranged on the first rotating shaft;
the second motor is arranged on the cylindrical shell and is provided with a second rotating shaft; the second motor and the first motor are coaxially arranged;
the second fan blade is arranged on the second rotating shaft;
the electric control board is electrically connected with the first motor and the second motor and controls the first fan blade and the second fan blade to emit air in the same direction, and the electric control board comprises a rotation speed ratio adjusting module and a rotation direction adjusting module; the rotation speed ratio adjusting module is used for adjusting and fixing the rotation speed ratio of the first motor to the second motor, and the steering adjusting module is used for switching the rotation directions of the first motor and the second motor;
the number of the blades of the first fan blade is n 1 The number of the blades of the second fan blade is n 2 The method comprises the steps of carrying out a first treatment on the surface of the The torsion angle of the first fan blade is theta 1 The torsion angle of the second fan blade is theta 2 The method comprises the steps of carrying out a first treatment on the surface of the The angular velocity of the rotation of the first fan blade is omega 1 The angular velocity of the second fan blade is omega 2 The method comprises the steps of carrying out a first treatment on the surface of the Defining the product of the ratio of the number of the blades of the first fan blade to the number of the blades of the second fan blade, the ratio of the torsion angle of the first fan blade to the torsion angle of the second fan blade and the ratio of the angular speed of the first fan blade to the angular speed of the second fan blade as a first difference coefficient, then the first difference coefficient
The first difference coefficient k 1 ∈[0.6,1.67]；
The total area of the blades of the first fan blade is S 1 The total blade area of the second fan blade is S 2 The method comprises the steps of carrying out a first treatment on the surface of the Defining a second difference coefficient as the product of the ratio of the total area of the first fan blade to the total area of the second fan blade and the first difference coefficient, and then the second difference coefficientAnd k is 2 ∈[0.8，1.25]；
The second fan blade is used for generating air flow with axial momentum and air flow with momentum vertical to the axial direction in a rotating mode, the cylindrical shell is used for converting the air flow with momentum vertical to the axial direction generated by the second fan blade into air flow with rotational inertia rotating in the circumferential direction, and the air flow with rotational inertia rotating in the circumferential direction is converted into air flow with axial momentum by adjusting the rotation speed ratio and the torsion angle ratio of the first fan blade and the second fan blade.
2. The fan of claim 1, wherein the first blade and the second blade have the same twist direction, and the first motor and the second motor rotate in the same direction.
3. The fan of claim 1, wherein the first blade and the second blade are twisted in opposite directions, and the first motor and the second motor are rotated relative to each other.
4. The fan of claim 1, wherein the steering adjustment module includes a protection switch to shut off the steering adjustment module when the first motor and the second motor are operating.
5. The fan of claim 1, wherein the electronic control board further comprises a gear adjustment module comprising an editor and a memory that can edit gears; the gear adjusting module further comprises a plurality of preset gear selection keys and at least one custom gear selection key.
6. The fan of claim 1 wherein said first coefficient of difference k 1 ∈[0.8,1.25]。
7. The fan of claim 1 wherein said first fan blade has a blade length of l 1 The blade length of the second fan blade is l 2 The method comprises the steps of carrying out a first treatment on the surface of the The distance between the first fan blade and the second fan blade is LAnd is also provided with
8. The fan of claim 1, further comprising a third blade mounted to the first shaft.
9. The fan of claim 8, wherein the third blade is disposed outside of the first blade, and wherein a blade length of the third blade is less than a blade length of the first blade.
10. The fan as claimed in any one of claims 1 to 9, further comprising a fourth fan blade mounted to the second rotation shaft.
11. The fan of claim 10, wherein the fourth blade is disposed between the first blade and the second blade, and wherein a blade length of the fourth blade is less than a blade length of the second blade.
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| CN201810749398.7A CN109306968B (en) | 2018-07-09 | 2018-07-09 | Fan with fan body |
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| CN109958639B (en) * | 2019-04-22 | 2021-01-22 | 广东美的制冷设备有限公司 | Fan assembly of air conditioner outdoor unit and air conditioner outdoor unit with same |
| CN112556404A (en) * | 2020-12-07 | 2021-03-26 | 九江市钒宇新材料股份有限公司 | Sintering furnace for producing vanadium-nitrogen alloy |
| CN112983880B (en) * | 2021-02-24 | 2022-07-05 | 重庆上方汽车配件有限责任公司 | Through-flow fan drive shaft connecting device |
| CN113464476A (en) * | 2021-09-03 | 2021-10-01 | 南通南洋风机制造有限公司 | Cooling type air flow device |
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| CN208778286U (en) * | 2018-07-09 | 2019-04-23 | 广东美的环境电器制造有限公司 | Fan |
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| CN104235065A (en) * | 2013-06-07 | 2014-12-24 | 日本电产株式会社 | Serial axial fan |
| CN206309618U (en) * | 2016-12-09 | 2017-07-07 | 杭州微光电子股份有限公司 | Double-vane fan |
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