CN101331362B - Outdoor unit for air conditioner - Google Patents
Outdoor unit for air conditioner Download PDFInfo
- Publication number
- CN101331362B CN101331362B CN2007800007475A CN200780000747A CN101331362B CN 101331362 B CN101331362 B CN 101331362B CN 2007800007475 A CN2007800007475 A CN 2007800007475A CN 200780000747 A CN200780000747 A CN 200780000747A CN 101331362 B CN101331362 B CN 101331362B
- Authority
- CN
- China
- Prior art keywords
- fan
- propeller type
- wind
- type fan
- blade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/007—Axial-flow pumps multistage 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
- F04D19/00—Axial-flow pumps
- F04D19/02—Multi-stage pumps
- F04D19/024—Multi-stage pumps with contrarotating parts
-
- 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
-
- 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
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/40—Vibration or noise prevention at outdoor units
-
- 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
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/46—Component arrangements in separate outdoor units
- F24F1/48—Component arrangements in separate outdoor units characterised by air airflow, e.g. inlet or outlet airflow
- F24F1/54—Inlet and outlet arranged on opposite sides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Other Air-Conditioning Systems (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
An outdoor unit (1) for an air conditioner, having improved COP and periodic electric power consumption of the air conditioner, which is achieved by reducing an input to a fan motor of the outdoor unit to enhance static pressure efficiency. The outdoor unit (1) has two propeller fans (5, 6) for promoting heat exchange and rotating in opposite directions to each other, a fan motor (7) for rotating the upwind propeller fan (5) of the two propeller fans, and a reversing mechanism (8) for reversing the rotation direction of the fan motor (7) and transmitting the reversed rotation. The downwind propeller fan (6) is provided coaxial with and on the downstream side of the upwind propeller fan (5) and is reversely rotated by the reversing mechanism (8). The upwind and downwind propeller fans (5, 6) have blade shapes whose chords are bent in the opposite directions and that are line symmetrically formed when viewed from the axis direction. The fans (5, 6) are rotated in the opposite directions from each other but produce airflow in the same direction.
Description
Technical field
The pressure fan that the promotion heat exchange that the present invention relates to use in a kind of off-premises station at air conditioner etc. is used relates in particular to the technology of the fan efficiency (static pressure efficiency) that improves pressure fan.
Background technology
The indoor set that this use in refrigeration system pipe arrangement will have heat exchanger and a pressure fan links to each other with the off-premises station with compressor, heat exchanger and pressure fan and forms kind of refrigeration cycle, carry out refrigerating operaton or heating operation by the heat conveying that is filled in the cold-producing medium in the kind of refrigeration cycle, thereby carry out indoor air conditioning.In off-premises station, pressure fan is made of fan and fan motor as the device that promotes the heat exchanger heat exchange, and the air quantity of this pressure fan influences the ability of air conditioner largely, and the performance that comprises noise is had bigger influence.
Especially in heating operation, airborne condensate moisture becomes dew and is attached on the heat exchanger of off-premises station, and this can hinder the air-flow that flows through heat exchanger.When temperature became lower, dew became ice or frost and the state that form to stop up, and for the decline that also can suppress air quantity under this situation, reduce noise, the fan efficiency that improves pressure fan is very important.
Disclosed the pressure fan used with the promotion heat exchange of in the off-premises station of air conditioner etc., using and reduce noise and be the relevant technology of the stator before rotor sheet of purpose (for example with reference to Japan Patent JP2002-81695A) to improve the efficient that its dynamic pressure is reclaimed.
Figure 19 is the sectional elevation of the off-premises station of existing air conditioner.Off-premises station 80 has in body outer container 84: the stator before rotor sheet 86 and the opening 87 of fan motor 82 that compressor space 83, heat exchanger 81, promotion heat exchange are used and pressure fan 85, recovery dynamic pressure are configured in pressure fan 85 and the upside of the stator before rotor sheet 86 that reclaims its dynamic pressure from wind on the same axle center of fan motor 82.
Disclosure of an invention
Invent technical problem to be solved
Yet, in above-mentioned existing structure, promptly use the stator before rotor sheet 86 absolute velocity C of sending and receiving blower fan 85 back and forth
2Circumferential composition V
θ, the recovery of stator blade can not be reclaimed V fully
θ, there is the limit in dynamic pressure to the conversion of static pressure.That is be Pd=0.5 * ρ * V, in this said dynamic pressure
θ 2(ρ is a density, and unit is kgsec
2M
4, C
2And V
θUnit be m/sec).By the way, when on the pressure fan 85 of φ 415mm stator before rotor sheet 86 being installed, the ratio of the raising of operating point static pressure efficiency is roughly about 7%.
In view of the above problems, the object of the present invention is to provide a kind of off-premises station of air conditioner, increase static pressure and air quantity, also can suppress the decline of air quantity and reduce noise for the air-supply impedance by the fan efficiency (static pressure efficiency) that improves pressure fan.
The technical scheme that the technical solution problem is adopted
In order to address the above problem, the off-premises station of air conditioner of the present invention comprises: compressor, heat exchanger, as two propeller type fans that promote the fan that described heat exchanger heat exchange is used, described two propeller type fans are coaxially near being provided with, when oppositely rotating (counter-rotating) mutually, airflow direction is identical.
Thus, the rotating energy of the wake flow of the propeller type fan of the wind upstream side in two propeller type fans (energy of the waste that rotating flow is subsidiary) can by near and the propeller type fan in the wind downstream of counter-rotating (oppositely rotation mutually) reclaim, and can make the rotating flow of wake flow of the propeller type fan in wind downstream roughly become zero.Promptly, compare when in the off-premises station of air conditioner, only using larger-size (degree of depth is identical with two a propeller type fans of the present invention) propeller type fan, can improve the operating point static pressure efficiency, can increase static pressure and air quantity, also can suppress the decline of air quantity and reduce noise for the air-supply impedance.Consequently, can reduce the fan motor input power, can improve the COP (coefficient of performance) of air conditioner and reduce operation consumption electric power and noise.
The invention effect
Since the off-premises station of air conditioner of the present invention can with the wind downstream propeller type fan of counter-rotating call prisoners in after letting them out for exercise back and forth the upstream side propeller type fan wake flow rotating energy (energy of the waste that rotating flow is subsidiary) and can make the rotating flow of the wake flow of wind downstream propeller type fan roughly become zero, therefore compare when in the off-premises station of air conditioner, only using a larger-size propeller type fan, static pressure and air quantity can be increased, the operating point static pressure efficiency can be improved.Consequently, can reduce the fan motor input power, can improve the COP of air conditioner and reduce operation consumption electric power, also can suppress the decline of air quantity and reduce noise for the air-supply impedance.
In addition, the off-premises station of the good air conditioner of a kind of efficient of pressure fan can be provided, especially in heating operation, be attached on the heat exchanger of off-premises station thereby aerial condensate moisture becomes dew and Yin Wendu becomes lower and causes dew to become ice or frost and form the state that stops up and form under the situation that hinders the air-flow that flows through heat exchanger, also can suppress the decline of air quantity and suppress the increase of noise.
Description of drawings
Fig. 1 is the sectional elevation of off-premises station of the air conditioner of the invention process form 1.
Fig. 2 is the A direction vertical view of wind upstream side propeller type fan of off-premises station of the air conditioner of the invention process form 1.
Fig. 3 is the A direction vertical view of wind downstream propeller type fan of off-premises station of the air conditioner of the invention process form 1.
Fig. 4 is the aspect ratio-air quantity characteristic figure of propeller type fan of off-premises station of the air conditioner of the invention process form 1.
Fig. 5 is the expansion leaf grating of cylinder section of square mean radial position of the wind upstream side of off-premises station of air conditioner of expression the invention process form 1 and wind downstream propeller type fan and the performance map of speed triangle.
Fig. 6 is the wind upstream side of off-premises station of air conditioner of the invention process form 1 and the static pressure-air quantity characteristic figure of wind downstream propeller type fan (to rotary fan).
Fig. 7 is the sectional elevation of off-premises station of the air conditioner of the invention process form 2.
Fig. 8 is the wind upstream side of off-premises station of air conditioner of the invention process form 4 and the meridian plane figure of wind downstream propeller type fan.
Fig. 9 is the wind upstream side of off-premises station of air conditioner of the invention process form 4 and the radial direction cutaway view of wind downstream propeller type fan.
Figure 10 is the wind upstream side of off-premises station of air conditioner of the invention process form 5 and the meridian plane figure of wind downstream propeller type fan.
Figure 11 is the wind upstream side of off-premises station of air conditioner of the invention process form 5 and the radial direction cutaway view of wind downstream propeller type fan.
Figure 12 is the A direction vertical view of wind upstream side mixed flow fan of off-premises station of the air conditioner of the invention process form 6.
Figure 13 is the A direction vertical view of wind downstream mixed flow fan of off-premises station of the air conditioner of the invention process form 1.
Figure 14 is the wind upstream side of off-premises station of air conditioner of the invention process form 6 and the meridian plane figure of wind downstream mixed flow fan.
Figure 15 is the wind upstream side of off-premises station of air conditioner of the invention process form 7 and the meridian plane figure of wind downstream mixed flow fan.
Figure 16 is the wind upstream side of off-premises station of air conditioner of the invention process form 7 and the radial direction cutaway view of wind downstream mixed flow fan.
Figure 17 is the wind upstream side of off-premises station of air conditioner of the invention process form 8 and the meridian plane figure of wind downstream mixed flow fan.
Figure 18 is the wind upstream side of off-premises station of air conditioner of the invention process form 8 and the radial direction cutaway view of wind downstream mixed flow fan.
Figure 19 is the sectional elevation of off-premises station of the air conditioner of existing embodiment.
The specific embodiment
The 1st invention comprises: compressor, heat exchanger, as two propeller type fans that promote the fan that described heat exchanger heat exchange is used, described two propeller type fans be coaxially near being provided with, and mutually oppositely during rotation (counter-rotating), airflow direction is identical.
Thus, the rotating energy of the wake flow of the propeller type fan of the wind upstream side in two propeller type fans (energy of the waste that rotating flow is subsidiary) can by near and the propeller type fan in the wind downstream of counter-rotating (oppositely rotation mutually) reclaim, and can make the rotating flow of the wake flow of wind downstream propeller type fan roughly become zero.Promptly, compare when in the off-premises station of air conditioner, only using larger-size (degree of depth is equivalent to two a propeller type fans of the present invention) propeller type fan, can improve the operating point static pressure efficiency, can increase static pressure and air quantity, or the air quantity that suppresses to cause because of the air-supply impedance attached to dew on the heat exchanger or frost etc. descends and the minimizing noise.Consequently, can reduce the input power of fan motor, can improve the COP (coefficient of performance) of air conditioner and reduce operation consumption electric power and noise.
In the 2nd invention, especially for the off-premises station of air conditioner of the 1st invention, the bending direction of its string shape of the blade shape of two propeller type fans is opposite, see from same axis direction and to be the line symmetry, in other words, the flat shape of a propeller type fan is identical shaped or similar shape when upset.Therefore, alteration of form have only wheel hub, and become easy for the design of bringing into play the performance of rotary fan.
In the 3rd invention, especially for the off-premises station of air conditioner of the 1st or the 2nd invention, have coaxially with propeller type fan: the reversing device that transmits after fan motor and the direction of rotation counter-rotating described fan motor, a propeller type fan in two propeller type fans is driven by described fan motor, and another propeller type fan is driven by described reversing device.
Thus, two propeller type fans of an available fans drive and make its oppositely rotation mutually, because the heavier fan motor of weight is one, so the constituent part of the off-premises station of air conditioner is few, light weight ground produces at low cost.
In the 4th invention, especially for the off-premises station of air conditioner of the 3rd invention, be equipped with heat exchanger, fan motor, wind upstream side propeller type fan, reversing device, wind downstream propeller type fan successively from the wind upstream side, described wind upstream side propeller type fan is driven by described fan motor, and described wind downstream propeller type fan is driven by described reversing device.
Adopt said structure, away from two propeller type fans of heat exchanger ground configuration, can between heat exchanger and propeller type fan, form big slightly space a little, therefore the wind speed profile of heat exchanger is become evenly, can further promote heat exchange.In addition, can not produce the wind cutting sound that the interference because of heat exchanger and wind upstream side propeller type fan causes yet.Moreover, owing to do not have fan motor, therefore can reduce the impedance of ventilating in the downstream of wind downstream propeller type fan.
In the 5th invention, because the reversing device of the 3rd or the 4th invention is housed in the wheel hub inside of wind upstream side propeller type fan or the wheel hub inside of wind downstream propeller type fan, or be housed in wind upstream side and wind downstream propeller type fan both sides' wheel hub inside, therefore can make between two propeller type fans more close.
In the 6th invention, for the 1st or the 2nd invention, two fan motors are installed in respectively on two propeller type fans, the fan motor that utilization is respectively equipped with drives two propeller type fans, therefore can adjust the rotating speed of two propeller type fans independently, can carry out setting arbitrarily with operation conditions is corresponding.
In the 7th invention, for the 3rd～the 6th invention, because fan motor is an external-rotor-type, therefore by the inner formation of wheel hub fan motor at propeller type fan, need not the space that fan motor is used, therefore the space of the wind path that constitutes off-premises station can be more effectively utilized, the homogenising of wind speed profile of heat exchanger and the minimizing of noise can be realized.In addition, can make the off-premises station miniaturization.
In the 8th invention, for the 1st～the 7th invention, two propeller type fans (to rotary fan) rotating speed separately of change counter-rotating on same axle is set, therefore by changing the rotating speed of two propeller type fans that reverse, the speed triangle of each propeller type fan dissimilates, the moment of the working time of the leaf grating of each propeller type fan staggers, thereby each leaf grating carries out the time shaft of work can not interfere, can not occur the peak value of the discrete noise that causes because of high frequency yet, also can realize low noise.
In the 9th invention, for the 1st～the 8th invention, the ratio of the blade chord length L of the representative physical length b of propeller type fan blade radius direction and the square mean radial position of blade, be that aspect ratio b/L is b/L≤1.1, the outer circumferential side blade chord length of described propeller type fan is more than the hub side blade chord length.
Because the outer circumferential side chord length of each propeller type fan is greater than the hub side chord length, therefore guarantee that the blade area of blade end is bigger, can fully absorb aerodynamic load ground and carry out work, thereby realize the raising and the low noiseization of the fan efficiency of each propeller type fan self.In addition, if aspect ratio b/L is set for≤1.1, the air quantity under the same noise situation then can be increased.
In the 10th invention, for the 1st～the 9th invention, leading edge on same axle on the meridian plane (meridian plane in the revolved projection) of two propeller type fans (to rotary fan) of counter-rotating is concavity with respect to the upside of wind, the blade cross sectional shape is concavity with respect to the upside of wind in the radial direction cross section, and the outer circumferential side chord length of each propeller type fan is more than the hub side chord length.
Adopt said structure, the rotating energy of the wake flow of wind upstream side propeller type fan (energy of the waste that rotating flow is subsidiary) can be reclaimed by the wind downstream propeller type fan of counter-rotating, and the rotating flow that can make the wake flow of wind downstream propeller type fan roughly becomes zero, therefore compare when in the off-premises station of air conditioner, only using a larger-size propeller type fan, static pressure and air quantity can be increased, the operating point static pressure efficiency can be improved.In addition, because of the suction surface of two propeller type fans reversing from same axle produces the blade end eddy current towards the leakage current of pressure face near the top margin side of the suction surface of propeller type fan, the part that the blade cross sectional shape is concavity with respect to the wind upstream side in the described radial direction cross section promotes the generation of this blade end eddy current, can make the flow regime of the blade of each propeller type fan become best, therefore can further improve the operating point static pressure efficiency.Moreover, because the outer circumferential side chord length of each propeller type fan is more than the hub side chord length, but the therefore load of reinforced blade end and produce the blade end eddy current rapidly, consumingly and make it depleted rapidly, thus can not interfere the rear blade, can reduce fan noise and improve the performance of fan efficiency.
In the 11st invention, for the 1st～the 9th invention, the leading edge of two propeller type fans (to rotary fan) on meridian plane (revolved projection) for counter-rotating on same axle, near the blade mid point top margin side is concavity with respect to the wind upstream side, hub side is convex, the cross sectional shape of the blade in the radial direction cross section is: the top margin side is concavity with respect to the upside of wind, and hub side is convex, and the outer circumferential side chord length of each propeller type fan is more than the hub side chord length.
Adopt said structure, the rotating energy of the wake flow of wind upstream side propeller type fan (energy of the waste that rotating flow is subsidiary) can be reclaimed by the wind downstream propeller type fan of counter-rotating, and the rotating flow that can make the wake flow of wind downstream propeller type fan roughly becomes zero, therefore compare when in the off-premises station of air conditioner, only using a larger-size propeller type fan, static pressure and air quantity can be increased, the operating point static pressure efficiency can be improved.In addition, because of the suction surface of two propeller type fans reversing from same axle produces the blade end eddy current towards the leakage current of pressure face near the top margin side of the suction surface of propeller type fan, the part that the top margin side of blade cross sectional shape is concavity with respect to the wind upstream side in the described radial direction cross section promotes the generation of this blade end eddy current.The hub side male member of blade cross sectional shape guides to the stream that radial direction flows into the outer circumferential side from the blade of propeller type fan in the described radial direction cross section, therefore promote the generation and the radial flow of blade vortex, it is best that thereby the flow regime that can make the blade of each propeller type fan becomes, and can further improve the operating point static pressure efficiency.Moreover, because the outer circumferential side chord length of each propeller type fan is greater than the hub side chord length, but the therefore load of reinforced blade end and produce the blade end eddy current rapidly, consumingly and make its depletion rapidly, thus can not interfere the rear blade, can reduce fan noise and improve the performance of fan efficiency.
In the 12nd invention, for the 1st～the 11st invention, two of the counter-rotating fans (to rotary fan) that promote heat exchange to use use mixed flow fan to replace propeller type fan on same axle, this mixed flow fan is that each blade shape is designed to see that from same axis direction roughly being line symmetry and the number of blade is mixed flow fan more than a slice, and the wheel hub shape of mixed flow fan forms roughly circular cone shape.
Adopt said structure, the rotating energy of the wake flow of wind upstream side mixed flow fan (energy of the waste that rotating flow is subsidiary) can be reclaimed by the wind downstream mixed flow fan of counter-rotating, and the rotating flow that can make the wake flow of wind downstream mixed flow fan roughly becomes zero, therefore compare when in the off-premises station of air conditioner, only using a larger-size mixed flow fan, static pressure and air quantity can be increased, the operating point static pressure efficiency can be improved.In addition, the static pressure of mixed flow fan is higher than propeller type fan basically.When in the off-premises station of air conditioner, using the big fan of fan diameter, by with the similar law of the fan diameter of pressure fan and rotating speed can be clear and definite, static pressure can step-down.Therefore, when using the big fan of fan diameter in the off-premises station of air conditioner, using the high mixed flow fan of static pressure is best structure.This is relevant with raising operating point static pressure efficiency.Moreover, because the outer circumferential side chord length of each mixed flow fan is greater than the hub side chord length, but the therefore load of reinforced blade end and produce the blade end eddy current rapidly, consumingly and make its depletion rapidly, thus can not interfere the rear blade, can reduce fan noise and improve the performance of fan efficiency.
With reference to the accompanying drawings example of the present invention is described.The present invention is not limited to this example.
(example 1)
Fig. 1 is the sectional elevation of off-premises station of the air conditioner of the present invention's the 1st example.Fig. 2 is a vertical view of seeing the wind upstream side propeller type fan of this off-premises station from the A direction of Fig. 1.Fig. 3 is a vertical view of seeing the wind downstream propeller type fan of this off-premises station from the A direction.Fig. 4 is the aspect ratio-air quantity characteristic figure of each propeller type fan, expression be the air quantity of noise when being 41dB.
In Fig. 1, off-premises station 1 comprises: heat exchanger 2, vertical compressor 3, the sound panel 4 that compressor room and air supply path are separated, wind upstream side propeller type fan 5, wind downstream propeller type fan 6, fan motor 7, reversing device 8, opening 9, front surface grid 10 and fan motor seat 11 that gear with mechanism that the direction of rotation counter-rotating of fan motor 7 is transmitted etc. is accommodated.Propeller type fan 6 is that the 2 formation air-supplies of heat exchanging device are used for promoting the pressure fan that heat exchange is used as rotary fan is worked under wind upstream side propeller type fan 5 and the wind.
In Fig. 2, the blade 20 of wind upstream side propeller type fan 5 is made of two blades, comprising: the top margin 21, leading edge 22, trailing edge 23 and the wheel hub 24 that constitute outer peripheral edges.Single-point line B1 is the cylinder section line of blade 20 of the square mean radial position of wind upstream side propeller type fan 5.The blade chord length of the square mean radial position of the blade of propeller type fan is L, and the representative physical length of blade on radial direction is b.In Fig. 3, the blade 25 of wind downstream propeller type fan 6 is made of two blades, and is the same with wind upstream side propeller type fan 5, comprising: top margin 26, leading edge 27, trailing edge 28 and wheel hub 29.Single-point line B2 is the cylinder section line of blade 20 of the square mean radial position of wind downstream propeller type fan 6.Flowing of air is to flow out from leading edge 22,27 inflows and from trailing edge 23,28 respectively basically. Leading edge 22,27 is towards direction of rotation protract (leaning forward).
The bending direction of its string shape of shape of the blade 20,25 of wind upstream side propeller type fan 5 and wind downstream propeller type fan 6 is opposite, is designed in three-dimensional system of coordinate to see from same axis direction roughly be the line symmetry respectively.In other words, for the shape of two propeller type fans 5,6, flat shape is same or similar shape when upset, and bending blade becomes: airflow direction is identical when propeller type fan 5,6 oppositely rotates mutually.Thus, alteration of form have only wheel hub, and become easy for the design of bringing into play the performance of rotary fan.By the way, when changing the rotating speed of two propeller type fans, often the speed setting with wind downstream propeller type fan 6 becomes to be lower than wind upstream side propeller type fan 5.
The sheet number of blade is two in this example 1, but not special restriction.As Fig. 1～shown in Figure 3, in this example 1, leading edge 22,27 is made of helix, and the diameter of wind downstream propeller type fan 6 is less than wind upstream side propeller type fan 5.But be not limited thereto.Also can constitute by following shape: leading edge 22,27 is a linearity, the blade (delta-blade) of triangular shape is close on the leading edge that is installed to linearity, and is made outer circumferential side become same radius.
Be configured than hub side chord length length by outer circumferential side chord length and guarantee that the blade area of blade end is bigger each propeller type fan, can fully absorb aerodynamic load ground and carry out work, thereby realize the raising and the low noiseization of the fan efficiency of each propeller type fan self.In addition, if aspect ratio b/L is set for≤1.1, then shown in the air quantity characteristic when the noise of Fig. 4 is 41dB, can under identical noise situation, increase air quantity.
Structure as off-premises station 1, has compressor 3, heat exchanger 2, be provided with two fans of counter-rotating as the fan that promotes heat exchange to use, be wind upstream side propeller type fan 5 and wind downstream propeller type fan 6, has the fan motor 7 making 5 rotations of wind upstream side propeller type fan and supported of being used to by fan motor seat 11 at the upstream side of wind upstream side propeller type fan 5, and coaxial and make direction of rotation become the reversing device 8 of counter-rotating with fan motor 7 in wind upstream side propeller type fan 5 downstreams, have the wind downstream propeller type fan 6 of and counter-rotating coaxial with fan motor 7 in reversing device 8 downstreams.
Adopt such structure arranged, by disposing two propeller type fans 5,6 away from heat exchanger 2 ground a little, between heat exchanger 2 and wind upstream side propeller type fan 5, form bigger space, the wind speed profile of heat exchanger 2 is become evenly, can further promote heat exchange.Especially when heat exchanger 2 is U word shape shown in Figure 1 or not shown L word shape, because the easy variation of wind speed profile, so this example is more effective.In addition, can prevent that also the wind that the interference because of heat exchanger 2 and wind upstream side propeller type fan 5 causes from cutting sound.Moreover, owing to do not have fan motor 7 and fan motor seat 11, therefore can reduce the impedance of ventilating in the downstream of wind downstream propeller type fan 6, realize low noise.
The off-premises station of the good air conditioner of a kind of efficient of pressure fan can be provided, especially in heating operation, be attached on the heat exchanger of off-premises station thereby aerial condensate moisture becomes dew and Yin Wendu becomes lower and causes dew to become ice or frost and form the state that stops up and hinder under the situation of the air-flow that flows through heat exchanger, also can suppress the decline of air quantity and suppress the increase of noise.
Also reversing device 8 can be housed in the inside of the wheel hub 29 of the inside of wheel hub 24 of wind upstream side propeller type fan 5 or wind downstream propeller type fan 6, or the inside of wheel hub 24,29 of accommodating wheel hub 29 both sides of the inside of wheel hub 24 of wind upstream side propeller type fan 5 and wind downstream propeller type fan 6, so, can make off-premises station 1 further save the space.Simultaneously, also fan motor 7 can be housed in the inside of the wheel hub 29 of the inside of wheel hub 24 of wind upstream side propeller type fan 5 or wind downstream propeller type fan 6 as the fan motor of external-rotor-type, can make off-premises station 1 further save the space.For reversing device 8 and fan motor 7, can consider various combinations as the method for utilizing of the wheel hub inside of fan, by applying flexibly them effectively, can realize saving the space.
Adopt said structure, the rotating energy of wind upstream side propeller type fan 5 wake flows (energy of the waste that rotating flow is subsidiary) can be reclaimed by the wind downstream propeller type fan 6 of counter-rotating, and the rotating flow that can make propeller type fan 6 wake flows in wind downstream roughly becomes zero, therefore compare when in the off-premises station 1 of air conditioner, only using a larger-size propeller type fan, static pressure and air quantity can be increased, the operating point static pressure efficiency can be improved.Consequently, can reduce the input power of fan motor 7, thereby the COP and the operation that can reduce air conditioner consume electric power.Though fan motor 7 is one, but utilize the combination of gear shape in the reversing device 8 be built in wind upstream side propeller type fan 5 wake flows etc., the direction of rotation of the axle of fan motor 7 can be become opposite direction of rotation and passes to wind downstream propeller type fan 6, because the bigger fan motor 7 of weight is one, therefore the constituent part of the off-premises station of air conditioner is few, and light weight ground produces at low cost.Because leading edge 22 and 27 is protracted towards direction of rotation, the therefore load that can improve blade end, thus can produce the blade end eddy current rapidly, consumingly and make it depleted rapidly, thus can not interfere with the rear blade, can improve fan noise and the performance that improves fan efficiency.
Explain performance with Fig. 5 again.Fig. 5 is the expansion leaf grating of cylinder section of square mean radial position of each propeller type fan of expression and the performance map of speed triangle.Air-flow is with absolute velocity C
1The expansion leaf grating that flows into blade 20 (is used B among Fig. 2
1The leaf grating that cylinder blocks and launches).U
1Be rotary speed, W
1Be relative velocity.Air-flow is with absolute velocity C
2Flow into the expansion leaf grating of blade 25.U
2Be rotary speed (U
1=U
2), W
2Relative velocity for outlet.Absolute velocity C
2The meridian flow velocity be C
M2, circumferentially composition is V
θThe absolute velocity of launching the outlet of leaf grating 25 is C
3, rotary speed is U
3(U
3＜U
2), relative velocity is W
3, meridian flows and is C
M3Because circumferential composition V
θBe unfolded leaf grating 25 and reclaim fully, dynamic pressure Pd converts static pressure to, and therefore total static pressure increases.
Pd=0.5 * ρ * V
θ 2(ρ is a density, and unit is kg/sec
2M
4)
Utilize fan motor 7 to give and launch leaf grating 25 (leaf grating that blocks and launch with the B2 cylinder among Fig. 5) angle torque, thereby make described C
M2Speedup becomes absolute velocity C
3, the rotating flow composition is minimum.Like this, meridian flow velocity C
M3Increase C
M2＜C
M3, so the product of meridian flow velocity is air quantity q (m
3/ min) increase.At this, keep relative velocity W
1＞W
2Relation.At this, the unit of above-mentioned each flow velocity is (m/sec).Launch the wake flow C of leaf grating 25
3Rotating flow almost near zero.
Increase when consequently, Fig. 6 as described later, the static pressure of two propeller type fans (to rotary fan) of counter-rotating-air quantity characteristic are than the propeller type fan that only uses a single-stage.Speed setting at this supposition wind upstream side and wind downstream propeller type fan becomes 550rpm, and fan diameter is φ 415mm.The fan static pressures efficient that this means two propeller type fans (to rotary fan) of counter-rotating improves.Thus, can reduce the COP and the operation consumption electric power of air conditioner.
Fig. 6 is the static pressure to the rotary fan-air quantity characteristic figure of off-premises station of the present invention, relatively by two propeller type fans of counter-rotating constitute to the characteristic curve of rotary fan with the characteristic curve of (single-stage) propeller type fan in the rotary fan is represented.By with in the off-premises station 1 of air conditioner, only use one have with the situation of the larger-size propeller type fan to the rotary fan same depth of the present invention (fan diameter is φ 415mm) relatively, can distinguish by experimental data, its ratio of operating point static pressure efficiency improves 18% when using wind upstream side and wind downstream propeller type fan 5,6 (to rotary fan, fan diameter is φ 415mm).
The diameter of wind downstream propeller type fan 6 also can be less than the diameter of wind upstream side propeller type fan 5.Like this can be not lavishly the energy of the rotating flow of wind upstream side propeller type fan 5 wake flows not be reclaimed.Even the diameter of wind downstream propeller type fan 6 is greater than the diameter of wind upstream side propeller type fan 5, as long as get the action speed setting of wind downstream propeller type fan 6 littler, just can be not lavishly the energy of the rotating flow of wind upstream side propeller type fan 5 wake flows not be reclaimed, the meridian flow velocity becomes C
M3＞C
M2But and speedup, air quantity increases.
Because top margin 21, the 26 side chord lengths of wind upstream side and wind downstream propeller type fan 5,6 outer peripheral edges are greater than wheel hub 24,29 side chord lengths (length of top margin 21,26 side chord lengths is identical with wheel hub 24,29 side chord lengths at least), but the therefore load of reinforced blade end, thereby produce blade end eddy current and make it depleted rapidly consumingly rapidly,, thereby can not interfere, can reduce the performance of fan noise and raising fan efficiency with the rear blade.
Though not shown, leading edge 22,27 is protracted along direction of rotation, as other situation, even wind upstream side and wind downstream propeller type fan 5,6 are the line symmetry, leading edge 22,27 also can be brought into play the effect to rotary fan along the direction of rotation indentation.In addition, if wind upstream side and wind downstream propeller type fan 5,6 are not the line symmetry at least, and keep the direction relations (blade 20 is opposite with 25 bending direction) of rotating cascade shown in Figure 5, then also can be either party in the leading edge 22,27 for protracting and the combination of indentation along direction of rotation, also can bring into play effect in these cases to rotary fan.As the cross sectional shape of blade, can be the thick blade of slim vane or wing shapes, if thick blade then can reduce the separation of flow by the boundary layer of air-flow is controlled, can realize lower noise.
(example 2)
Fig. 7 is the sectional elevation of off-premises station of the air conditioner of the present invention's the 2nd example.In Fig. 7, off-premises station 1 comprises: heat exchanger 2, vertical compressor 3, sound panel 4, wind upstream side propeller type fan 5, wind downstream propeller type fan 6, the fan motor 7a that drives wind upstream side propeller type fan 5 that compressor room and air supply path are separated, fan motor 7b, opening 9, front surface grid 10 and fan motor seat 11a, the 11b that drives wind downstream propeller type fan 6.Propeller type fan 6 works as the pressure fan of using by the promotion heat exchange of swinging heat exchanging device 2 to form the air-supply effects mutually coaxially (to rotary fan) under wind upstream side propeller type fan 5 and the wind.Two fan motor 7a, 7b are the external-rotor-type fan motor, are embedded in the wheel hub inside of wind upstream side propeller type fan 5, wind downstream propeller type fan 6 respectively, become one with fan-shaped.
They constitute from the wind upstream side: heat exchanger 2, be built-in with external-rotor-type fan motor 7a wind upstream side propeller type fan 5, be built-in with wind downstream propeller type fan 6, the front surface grid 10 of another external-rotor-type fan motor 7b, and the bending direction of its string shape of blade shape of wind upstream side propeller type fan 5 and wind downstream propeller type fan 6 is opposite, forms in three-dimensional system of coordinate to see from same axis direction and roughly to be the line symmetry and to be made of two blades.
Adopt said structure, the rotating energy of the wake flow of wind upstream side propeller type fan 5 (energy of the waste that rotating flow is subsidiary) can be reclaimed by the wind downstream propeller type fan 6 of counter-rotating, and the rotating flow that can make the wake flow of wind downstream propeller type fan 6 roughly becomes zero, therefore compare when in the off-premises station 1 of air conditioner, only using a larger-size propeller type fan, static pressure and air quantity can be increased, the operating point static pressure efficiency can be improved.Consequently, can reduce the input power of fan motor 7a, 7b, thereby the COP and the operation that can reduce air conditioner consume electric power.In addition, though use two fan motor 7a, 7b, but owing to be necessary air quantity and static pressure identical design when in the off-premises station 1 of air conditioner, only using a larger-size propeller type fan, can reduce the blade load that two propeller type fans 5,6 (being also referred to as rotary fan) are subjected to separately, therefore the result is, even with the input power addition of two fan motor 7a, 7b, also can be when only using a larger-size propeller type fan only use a fan motor time input power.
Two fan motor 7a, 7b are external-rotor-type, counter-rotating mutually, be embedded in the hub portion inside of two propeller type fans 5,6, so propeller type fan 5,6 and external-rotor-type fan motor 7a, 7b form as one, thus the saving space that also can realize the off-premises station of air conditioner.At this, certainly, even fan motor 7a, 7b are not the external-rotor-type fan motors, but the common fan motor that makes the fan motor axis rotation is arranged on coaxially the outside of wind upstream side and wind downstream propeller type fan, also just take up room, short of special obstruction just.By being configured by the wind upstream side propeller type fan 5 that is built-in with external-rotor-type fan motor 7a, the order that is built-in with the wind downstream propeller type fan 6 of another external-rotor-type fan motor 7b from the wind upstream side, leaving two propeller type fans 5,6 of heat exchanger 2 farthest configuration, can between heat exchanger 2 and wind upstream side propeller type fan 5, form big slightly space, the wind speed profile of heat exchanger 2 is become evenly, can further promote heat exchange.In addition, also can prevent the wind cutting sound that the interference because of heat exchanger 2 and wind upstream side propeller type fan 5 causes.Moreover, owing to do not have fan motor and fan motor seat, therefore can reduce the impedance of ventilating in the downstream of wind downstream propeller type fan 6, realize low noise.
Because outer circumferential side 21,26 chord lengths of each propeller type fan 5,6 are greater than wheel hub 24,29 side chord lengths, but the therefore load of reinforced blade end and produce the blade end eddy current rapidly, consumingly and make it depleted rapidly, thereby can not interfere the rear blade, can reduce the performance of fan noise and raising fan efficiency.
(example 3)
With Fig. 1 and Fig. 7 the 3rd example of the present invention is described.Because sign flag and structure are illustrated in example 1,2, therefore save.
A kind of off-premises station of air conditioner is provided, and the rotating speed that changes two propeller type fans 5,6 (to rotary fans) of counter-rotating on same axle is set, and has as two propeller type fans 5,6 (to rotary fan) that promote the fan use that heat exchange is used.For example, in example 1, can utilize the ratio of recently setting the rotating speed of the rotating speed of wind upstream side propeller type fan 5 and wind downstream propeller type fan 6 as the transmission of the reversing device 8 of reversing device.In example 2,, therefore can freely set rotating speed separately owing on each propeller type fan 5,6, be equipped with fan motor 7a, 7b.
Adopt said structure, owing to can change the rotating speed of two propeller type fans 5,6 of counter-rotating, so speed triangle difference of each propeller type fan 5,6, the moment of 20,25 working times of leaf grating of each propeller type fan 5,6 staggers, thereby each leaf grating 20,25 carries out the time shaft of work can not interfere, can not occur the peak value of the discrete noise that causes because of high frequency yet, also can realize low noise.If outer circumferential side 21,26 chord lengths of each propeller type fan 5,6 are greater than wheel hub 24,29 side chord lengths, but the then load of reinforced blade end and produce the blade end eddy current rapidly, consumingly and make it depleted rapidly, thereby can not interfere the rear blade, can reduce the performance of fan noise and raising fan efficiency.
(example 4)
Fig. 8 is the meridian plane figure to the propeller type fan of rotary fan of off-premises station of the air conditioner of the present invention's the 4th example.Fig. 9 is the radial direction cutaway view of propeller type fan shown in Figure 8, expression be upside.Each wind upstream side and wind downstream propeller type fan are unified as sign flag 30.
In Fig. 8 and Fig. 9, propeller type fan 30 is made of two blades 31, comprising: leading edge 32, trailing edge 33, wheel hub 34 and top margin 35.Leading edge 32 on the meridian plane (revolved projection) of two propeller type fans 30 (to rotary fan) of counter-rotating on the same axle is concavity with respect to the wind upstream side, each propeller type fan 30 forms sees from airflow direction and to be the line symmetry that the cross sectional shape of blade 31 forms with respect to the wind upstream side and is concavity in the radial direction cross section.In addition, provide a kind of off-premises station with air conditioner of these two propeller type fans 30.
Adopt said structure, the rotating energy of the wake flow of wind upstream side propeller type fan 30 (energy of the waste that rotating flow is subsidiary) can be reclaimed by the wind downstream propeller type fan 30 of counter-rotating, and the rotating flow that can make the wake flow of wind downstream propeller type fan 30 roughly becomes zero, therefore compare when in the off-premises station 1 of air conditioner, only using a larger-size propeller type fan, static pressure and air quantity can be increased, the operating point static pressure efficiency can be improved.In addition, because of the suction surface of two propeller type fans 30 reversing from same axle produces the blade end eddy current towards the leakage current of pressure face near the top margin side of the suction surface of propeller type fan, the part that the cross sectional shape of blade 31 is concavity with respect to the wind upstream side in the described radial direction cross section promotes the generation of this blade end eddy current, can make the flow regime of the blade 31 of each propeller type fan 30 become best, therefore can further improve the operating point static pressure efficiency.At this, even adopting, the spill blade shape of propeller type fan 30 also has effect in either party's fan, can further bring into play this effect but in both sides, adopt.
Because outer circumferential side 35 chord lengths of each propeller type fan 30 are greater than wheel hub 34 side chord lengths, but the therefore load of reinforced blade end and produce the blade end eddy current rapidly, consumingly and make it depleted rapidly, thereby can not interfere the rear blade, can reduce the performance of fan noise and raising fan efficiency.
(example 5)
Figure 10 is the meridian plane figure to the propeller type fan of rotary fan of the off-premises station of the present invention's the 5th example.Figure 11 is the radial direction cutaway view of propeller type fan shown in Figure 10, expression be upside.Each wind upstream side and wind downstream propeller type fan are unified as sign flag 36.
In Figure 10 and Figure 11, propeller type fan 36 is made of two blades 37, comprising: leading edge 38, trailing edge 39, wheel hub 40 and top margin 41.C-C is the dotted line of blade 37.For the leading edge 38 on the meridian plane (revolved projection) of two propeller type fans 36 (to rotary fan) of counter-rotating on the same axle, the top margin side 41 of (C-C) is concavity with respect to the wind upstream side near the mid point of blade 37, wheel hub 40 sides are convex, cross sectional shape for blade 37 in the radial direction cross section, top margin 41 sides are concavity with respect to the wind upstream side, and wheel hub 40 sides form convex.In addition, provide a kind of off-premises station with air conditioner of these two propeller type fans 36.
Adopt said structure, the rotating energy of the wake flow of wind upstream side propeller type fan 36 (energy of the waste that rotating flow is subsidiary) can be reclaimed by the wind downstream propeller type fan 36 of counter-rotating, and the rotating flow that can make the wake flow of wind downstream propeller type fan 36 roughly becomes zero, therefore compare when in the off-premises station 1 of air conditioner, only using a larger-size propeller type fan, static pressure and air quantity can be increased, the operating point static pressure efficiency can be improved.In addition, because of the suction surface of two propeller type fans 36 reversing from same axle produces the blade end eddy current towards the leakage current of pressure face near the top margin side of the suction surface of propeller type fan 36, the part that top margin 41 sides of the cross sectional shape of blade 37 are concavity with respect to the wind upstream side in the described radial direction cross section promotes the generation of this blade end eddy current.The air-flow channeling conduct that the male member of wheel hub 40 sides of the cross sectional shape of blade 36 flows into to radial direction the outer circumferential side from the blade 37 of propeller type fan 36 in the described radial direction cross section, therefore promote the generation and the radial flow of blade vortex, it is best that thereby the flow regime that can make the blade 37 of each propeller type fan 36 becomes, and can further improve the operating point static pressure efficiency.At this, even adopting, the concave-convex blade shape of propeller type fan 36 also has effect in either party's fan, can further bring into play this effect but in both sides, adopt.
Because outer circumferential side 41 chord lengths of each propeller type fan 36 are greater than wheel hub 40 side chord lengths, but the therefore load of reinforced blade end and produce the blade end eddy current rapidly, consumingly and make its depletion rapidly, thereby can not interfere the rear blade, can reduce the performance of fan noise and raising fan efficiency.
(example 6)
Figure 12 is the A direction vertical view of wind upstream side mixed flow fan of the off-premises station of the present invention's the 6th example, and Figure 13 is the A direction vertical view of wind downstream mixed flow fan, and Figure 14 is the meridian plane figure of wind upstream side and wind downstream mixed flow fan.Each wind upstream side and wind downstream propeller type fan are unified as sign flag 42.
In Figure 12, wind upstream side mixed flow fan 42 comprises: two blades 43, the leading edge 44, trailing edge 45, top margin 46 and the wheel hub 47 that protract along direction of rotation.In Figure 13, wind downstream mixed flow fan comprises: two blades 49, the leading edge 50, trailing edge 51, top margin 52 and the wheel hub 53 that protract along direction of rotation.Two fans that promote heat exchange to use of counter-rotating are mixed flow fan rather than propeller type fan on same axle, the bending direction of each blade 43,49 its string shapes of shape is opposite, be to be designed in three-dimensional system of coordinate to see that from same axis direction roughly being line symmetry and the number of blade is two mixed flow fan 42,48 (to rotary fan), the shape of the wheel hub 47,53 of mixed flow fan 42,48 forms roughly circular cone shape.In addition, provide a kind of off-premises station with air conditioner of these two mixed flow fans 42,48.At this, the rotary speed of wind upstream side mixed flow fan 42 is faster than wind downstream mixed flow fan 48.Leading edge 44 and 50 is protracted along direction of rotation.This leading edge 44,50 is made of helix, but trailing edge 45,51 is a linearity, also can followingly constitute: the blade (delta-blade) of triangular shape is close to the linearity leading edge and is installed to outer circumferential side, and make the radius of blade 43,49 identical.
Adopt said structure, the rotating energy of the wake flow of wind upstream side mixed flow fan 42 (energy of the waste that rotating flow is subsidiary) can be reclaimed by the wind downstream mixed flow fan 48 of counter-rotating, and the rotating flow that can make the wake flow of wind downstream mixed flow fan 48 roughly becomes zero, therefore compare when in the off-premises station 1 of air conditioner, only using a larger-size mixed flow fan, static pressure and air quantity can be increased, the operating point static pressure efficiency can be improved.In addition, the static pressure of mixed flow fan is higher than propeller type fan basically.When in the off-premises station 1 of air conditioner, using the big fan of fan diameter, by with the similar law of the fan diameter of pressure fan and rotating speed can be clear and definite, static pressure can step-down.Therefore, when using the big fan of fan diameter in the off-premises station 1 of air conditioner, using the high mixed flow fan of static pressure is best structure.This is relevant with raising operating point static pressure efficiency.Because leading edge 44 and 50 is protracted along direction of rotation, therefore can improve the blade end load, thereby can produce stronger blade end eddy current.Though produce the blade end eddy current rapidly, consumingly and make it depleted rapidly, can not interfere the rear blade, the function admirable of fan noise, fan efficiency.
Because outer circumferential side 46,52 chord lengths of each mixed flow fan 42,48 are greater than wheel hub 47,53 side chord lengths (length of outer circumferential side 46,52 chord lengths is identical with wheel hub 47,53 side chord lengths at least), but the therefore load of reinforced blade end and produce the blade end eddy current rapidly, consumingly and make its depletion rapidly, thereby can not interfere the rear blade, can reduce the performance of fan noise and raising fan efficiency.
Though not shown, leading edge 44,50 is protracted along direction of rotation, as other situation, even wind upstream side and wind downstream mixed flow fan 42,48 holding point symmetry, leading edge 44,50 also can be brought into play the effect to rotary fan along the direction of rotation indentation.In addition, if wind upstream side and wind downstream mixed flow fan 42,48 are not the line symmetry at least, and the direction relations that keeps rotating cascade shown in Figure 5 is (if continue to use the words of Fig. 5, then blade 20 is opposite with 25 bending direction), then also can be either party in the leading edge 44,48 of wind upstream side and wind downstream mixed flow fan 42,48 for protracting along direction of rotation and the combination of indentation, also can bring into play effect in these cases to rotary fan.
(example 7)
With Figure 15 and Figure 16 the 7th example of the present invention is described.Figure 15 is the meridian plane figure of each mixed flow fan to rotary fan of the present invention, and Figure 16 is the radial direction cutaway view of each mixed flow fan to rotary fan of the present invention.Each wind upstream side and wind downstream propeller type fan are unified as sign flag 60.
In Figure 15, the blade 61 of wind upstream side and wind downstream mixed flow fan 60 comprises: leading edge 62, trailing edge 63, top margin 64 and wheel hub 65.D-D is the dotted line of blade 61.Constitute air conditioner with two mixed flow fans 60, two fans that promote heat exchange to use of counter-rotating are mixed flow fan 60 (to rotary fan) rather than propeller type fan on same axle, be to be designed to see that from same axis direction the symmetry roughly and the number of blade are two mixed flow fan 60, the wheel hub shape 65 of mixed flow fan 60 forms roughly circular cone shape, for the leading edge 62 on the meridian plane (revolved projection) of mixed flow fan 60, near the mid point of blade (D-D) top margin 64 sides are concavity with respect to the wind upstream side, wheel hub 65 sides are convex, cross sectional shape for blade 61 in the radial direction cross section, top margin 64 sides are concavity with respect to the wind upstream side, and wheel hub 65 sides are convex.
Adopt said structure, the rotating energy of the wake flow of wind upstream side mixed flow fan 60 (energy of the waste that rotating flow is subsidiary) can be reclaimed by the wind downstream mixed flow fan 60 of counter-rotating, and the rotating flow that can make the wake flow of wind downstream mixed flow fan 60 roughly becomes zero, therefore compare when in the off-premises station 1 of air conditioner, only using a larger-size mixed flow fan, static pressure and air quantity can be increased, the operating point static pressure efficiency can be improved.In addition, the static pressure of mixed flow fan is higher than propeller type fan basically.When in the off-premises station 1 of air conditioner, using the big fan of fan diameter, by with the similar law of the fan diameter of pressure fan and rotating speed can be clear and definite, static pressure can step-down.Therefore, when using the big fan of fan diameter in the off-premises station 1 of air conditioner, using the high mixed flow fan of static pressure is best structure.This can improve the operating point static pressure efficiency.
Because of the suction surface of two mixed flow fans 60 reversing from same axle produces the blade end eddy current towards the leakage current of pressure face near top margin 64 sides of the suction surface of mixed flow fan 60, the part that top margin 64 sides of the cross sectional shape of blade 61 are concavity with respect to the wind upstream side in the described radial direction cross section promotes the generation of this blade end eddy current.The male member of wheel hub 65 sides of the cross sectional shape of blade 61 guides to the stream that radial direction flows into the outer circumferential side from the blade of mixed flow fan 60 in the described radial direction cross section, therefore promote blade end eddy current and radial flow, it is best that thereby the flow regime that can make the blade of each mixed flow fan 60 becomes, and can further improve the operating point static pressure efficiency.At this, even adopting, the concave-convex blade shape of mixed flow fan 60 also has effect in either party's fan, can further bring into play this effect but in both sides, adopt.
Because outer circumferential side 64 chord lengths of each mixed flow fan 60 are greater than wheel hub 65 side chord lengths, but the therefore load of reinforced blade end and produce the blade end eddy current rapidly, consumingly and make it depleted rapidly, thereby can not interfere the rear blade, can reduce the performance of fan noise and raising fan efficiency.
(example 8)
With Figure 17 and Figure 18 the 8th example of the present invention is described.Figure 17 is the meridian plane figure of each mixed flow fan to rotary fan of the present invention, and Figure 18 is the radial direction cutaway view of each mixed flow fan to rotary fan of the present invention.At this, each wind upstream side and wind downstream mixed flow fan are unified as sign flag 66.
In Figure 17, the blade 67 of wind upstream side and wind downstream mixed flow fan 66 comprises: leading edge 68, trailing edge 69, top margin 70 and wheel hub 71.Constitute the off-premises station 1 of air conditioner with two mixed flow fans 66, two fans that promote heat exchange to use of counter-rotating are mixed flow fan 66 (to rotary fan) rather than propeller type fan on same axle, the shape of the wheel hub 71 of mixed flow fan 66 forms roughly circular cone shape, be to be designed to see that from same axis direction the substantial line symmetry and the number of blade are two mixed flow fan 66, leading edge 68 on the meridian plane of mixed flow fan 66 (revolved projection) is concavity with respect to the wind upstream side, and the cross sectional shape of blade 67 is concavity with respect to the wind upstream side in the radial direction cross section.
Adopt said structure, the rotating energy of the wake flow of wind upstream side mixed flow fan 66 (energy of the waste that rotating flow is subsidiary) can be reclaimed by the wind downstream mixed flow fan 66 of counter-rotating, and the rotating flow that can make the wake flow of wind downstream mixed flow fan 66 roughly becomes zero, therefore compare when in the off-premises station 1 of air conditioner, only using a larger-size mixed flow fan, static pressure and air quantity can be increased, the operating point static pressure efficiency can be improved.In addition, the static pressure of mixed flow fan is higher than propeller type fan basically.When in the off-premises station 1 of air conditioner, using the big fan of fan diameter, by with the similar law of the fan diameter of pressure fan and rotating speed can be clear and definite, static pressure can step-down.Therefore, when using the big fan of fan diameter in the off-premises station 1 of air conditioner, using the high mixed flow fan of static pressure is best structure.This can improve the operating point static pressure efficiency.In addition, because of the suction surface of two mixed flow fans 66 reversing from same axle produces the blade end eddy current towards the leakage current of pressure face near the top margin side 70 of the suction surface of mixed flow fan 66, the part that is concavity with respect to the wind upstream side of the cross sectional shape of blade 67 promotes the generation of this blade end eddy current in the described radial direction cross section, can make the flow regime of the blade 67 of each mixed flow fan 66 become best, therefore can further improve the operating point static pressure efficiency.At this, even adopting, the spill blade shape of mixed flow fan 66 also has effect in either party's fan, can further bring into play this effect but in both sides, adopt.
Because outer circumferential side 70 chord lengths of each mixed flow fan 66 are greater than wheel hub 71 side chord lengths, but the therefore load of reinforced blade end and produce the blade end eddy current rapidly, consumingly and make it depleted rapidly, thereby can not interfere the rear blade, can reduce the performance of fan noise and raising fan efficiency.
Industrial utilizability
As mentioned above, in the off-premises station of air conditioner of the present invention, the rotating energy of the wake flow of wind upstream side propeller type fan (energy of the waste that rotating flow is subsidiary) can be reclaimed by the wind downstream propeller type fan of counter-rotating, and the rotating flow that can make the wake flow of wind downstream propeller type fan roughly becomes zero, therefore compare when in the off-premises station of air conditioner, only using a larger-size propeller type fan, static pressure and air quantity can be increased, operating point static pressure efficient can be improved. Consequently, can reduce the input power of fan motor, reduce COP and the operation power consumption of air conditioner, also can suppress the decline of air quantity and reduce noise for the air-supply impedance, can be applicable to room conditioning machine and shop with in the various air conditioners such as standard air conditioner.
In addition, describedly can expand in the civilian equipment as the industrial product that uses fan rotary fan. That is, also can be used as ventilation fan, home-use fan, computer cooling fan etc. expands.
Claims (9)
1. the off-premises station of an air conditioner, comprise: compressor, heat exchanger, as the reversing device that transmits after two propeller type fans that promote the fan that described heat exchanger heat exchange is used, fan motor, the direction of rotation counter-rotating with described fan motor, described two propeller type fans are coaxially near being provided with, described fan motor and described reversing device and propeller type fan are provided with coaxially
It is characterized in that, be equipped with wind downstream propeller type fan in the wind upstream side propeller type fan described heat exchanger, described fan motor, described two propeller type fans, described reversing device, described two propeller type fans successively from the wind upstream side, described wind upstream side propeller type fan is driven by described fan motor, described wind downstream propeller type fan is driven by described reversing device
Described wind upstream side propeller type fan and described wind downstream propeller type fan are when oppositely rotating mutually, and airflow direction is identical.
2. the off-premises station of air conditioner as claimed in claim 1 is characterized in that, the bending direction of its string shape of the blade shape of two propeller type fans is opposite, sees from same axis direction to be the line symmetry.
3. the off-premises station of air conditioner as claimed in claim 1, it is characterized in that, reversing device is housed in the wheel hub inside of wind upstream side propeller type fan or the wheel hub inside of wind downstream propeller type fan, or is housed in wind upstream side and wind downstream propeller type fan both sides' wheel hub inside.
4. the off-premises station of air conditioner as claimed in claim 1 is characterized in that, fan motor is an external-rotor-type.
5. the off-premises station of air conditioner as claimed in claim 1 is characterized in that, the rotating speed that changes two propeller type fans of counter-rotating on same axle is set.
6. the off-premises station of air conditioner as claimed in claim 1, it is characterized in that, the ratio of the blade chord length L of the representative physical length b of propeller type fan blade radius direction and the square mean radial position of blade, be that aspect ratio b/L is b/L≤1.1, the outer circumferential side blade chord length of described propeller type fan is more than the hub side blade chord length.
7. the off-premises station of air conditioner as claimed in claim 1, it is characterized in that, leading edge on the meridian plane of propeller type fan is concavity with respect to the upside of wind, the blade cross sectional shape is concavity with respect to the upside of wind in the radial direction cross section, and the outer circumferential side chord length of described propeller type fan is more than the hub side chord length.
8. the off-premises station of air conditioner as claimed in claim 1, it is characterized in that, for the leading edge on the meridian plane of propeller type fan, near the blade mid point top margin side is concavity with respect to the wind upstream side, and hub side is convex, and for the cross sectional shape of the blade in the radial direction cross section, the top margin side is concavity with respect to the upside of wind, and hub side is convex, and the outer circumferential side chord length of described propeller type fan is more than the hub side chord length.
9. as the off-premises station of each described air conditioner in the claim 1 to 8, it is characterized in that the mixed flow fan of truncated cone shape replaces propeller type fan to use the wheel hub shape to form roughly as promoting heat exchange to use.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006168328 | 2006-06-19 | ||
| JP168328/2006 | 2006-06-19 | ||
| JP041900/2007 | 2007-02-22 | ||
| JP2007041900A JP5003198B2 (en) | 2006-06-19 | 2007-02-22 | Air conditioner outdoor unit |
| PCT/JP2007/062211 WO2007148645A1 (en) | 2006-06-19 | 2007-06-18 | Outdoor unit for air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101331362A CN101331362A (en) | 2008-12-24 |
| CN101331362B true CN101331362B (en) | 2011-06-22 |
Family
ID=38833387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800007475A Expired - Fee Related CN101331362B (en) | 2006-06-19 | 2007-06-18 | Outdoor unit for air conditioner |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5003198B2 (en) |
| CN (1) | CN101331362B (en) |
| WO (1) | WO2007148645A1 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101520495B1 (en) * | 2009-03-12 | 2015-05-14 | 엘지전자 주식회사 | Outdoor unit for air conditioner |
| KR101583080B1 (en) | 2009-03-12 | 2016-01-07 | 엘지전자 주식회사 | Outdoor unit for air conditioner |
| KR20110085646A (en) * | 2010-01-21 | 2011-07-27 | 엘지전자 주식회사 | Ventilating device and the refrigerator have the same |
| KR101253201B1 (en) * | 2011-10-13 | 2013-04-10 | 엘지전자 주식회사 | Air conditioner |
| JP5821565B2 (en) | 2011-11-21 | 2015-11-24 | 富士通株式会社 | Blower control device, blower control method, and blower control program |
| CN104024746B (en) * | 2011-12-19 | 2017-02-22 | 三菱电机株式会社 | Outdoor unit and refrigeration cycle device with outdoor unit |
| CN102967006B (en) * | 2012-12-21 | 2015-04-29 | 青岛海尔空调电子有限公司 | Embedded air conditioner internal unit with spiral fan |
| CN104235969A (en) * | 2014-09-14 | 2014-12-24 | 深圳市沃森空调技术有限公司 | Axial-flow fan blade of double-blade structure and air conditioner outdoor machine utilizing axial-flow fan blade |
| CN105588230A (en) * | 2014-12-12 | 2016-05-18 | 海信（山东）空调有限公司 | Outdoor unit of air conditioner |
| CN104534740A (en) * | 2014-12-18 | 2015-04-22 | 刘小江 | Refrigerating and heating method and device through reverse dual rotors and plate-fin type backflow thin channel or micro channel |
| KR101734722B1 (en) * | 2015-12-14 | 2017-05-11 | 엘지전자 주식회사 | Orifice for airconditioner |
| EP3444546A4 (en) * | 2016-04-14 | 2019-06-12 | Mitsubishi Electric Corporation | Refrigeration cycle device |
| CN108644153A (en) * | 2018-05-27 | 2018-10-12 | 东莞市兴东电子有限公司 | A kind of side-entry wind turbine |
| CN109269004B (en) * | 2018-09-21 | 2022-08-12 | 广东美的制冷设备有限公司 | Air conditioner, method of controlling the same, and computer-readable storage medium |
| CN109269005B (en) * | 2018-09-21 | 2022-08-05 | 广东美的制冷设备有限公司 | Air conditioner, method of controlling the same, and computer-readable storage medium |
| JP2021516305A (en) * | 2019-01-30 | 2021-07-01 | 広東美的制冷設備有限公司Ｇｄ Ｍｉｄｅａ Ａｉｒ−Ｃｏｎｄｉｔｉｏｎｉｎｇ Ｅｑｕｉｐｍｅｎｔ Ｃｏ．，Ｌｔｄ． | Indoor unit of fan and air conditioner equipped with it |
| CN110044008A (en) * | 2019-04-22 | 2019-07-23 | 广东美的制冷设备有限公司 | The control method of air-conditioner outdoor unit |
| EP3940304A4 (en) | 2019-09-27 | 2022-06-22 | Midea Welling Motor Technology (Shanghai) Co., Ltd | Air conditioner outdoor unit and air conditioning apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2550685Y (en) * | 2002-03-13 | 2003-05-14 | 殷少有 | High efficiency energy saving air exchanger |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH055499A (en) * | 1991-06-28 | 1993-01-14 | Mitsubishi Electric Corp | Double reversing type ventilation device |
| JP3637426B2 (en) * | 1995-07-26 | 2005-04-13 | 株式会社 日立インダストリイズ | Mixed flow fluid machine |
| JP3204208B2 (en) * | 1998-04-14 | 2001-09-04 | 松下電器産業株式会社 | Mixed-flow blower impeller |
| JP2000136798A (en) * | 1998-11-02 | 2000-05-16 | Kajima Corp | Noise reducing method and device of two-stage axial blower |
| JP2002206499A (en) * | 2001-01-10 | 2002-07-26 | Minebea Co Ltd | Impeller for axial blower |
| JP4273792B2 (en) * | 2003-03-11 | 2009-06-03 | 株式会社富士通ゼネラル | Air conditioner outdoor unit |
-
2007
- 2007-02-22 JP JP2007041900A patent/JP5003198B2/en not_active Expired - Fee Related
- 2007-06-18 WO PCT/JP2007/062211 patent/WO2007148645A1/en active Application Filing
- 2007-06-18 CN CN2007800007475A patent/CN101331362B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2550685Y (en) * | 2002-03-13 | 2003-05-14 | 殷少有 | High efficiency energy saving air exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007148645A1 (en) | 2007-12-27 |
| JP2008025983A (en) | 2008-02-07 |
| CN101331362A (en) | 2008-12-24 |
| JP5003198B2 (en) | 2012-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101331362B (en) | Outdoor unit for air conditioner | |
| EP2354685B1 (en) | Ventilating device and outdoor unit having the same | |
| CN108138798A (en) | Air blower and the conditioner for having the air blower | |
| CN203286669U (en) | Air conditioner with defrosting and cleaning functions | |
| JP2008202869A (en) | Outdoor unit of air conditioner | |
| CN201062585Y (en) | Mining explosion-proof press-in type dual-speed counter-rotating axial-flow auxiliary fan | |
| CN201547015U (en) | Low-noise centrifugal wind wheel | |
| CN202579312U (en) | Axial flow fan and radiating device | |
| CN101251278B (en) | Air conditioner | |
| US6814661B2 (en) | Air extraction fan | |
| CN102852854A (en) | Floor type air conditioner and oblique flow fan thereof | |
| CN207420962U (en) | A kind of aerofoil fan and air-conditioner outdoor unit for air-conditioner outdoor unit | |
| CN202883468U (en) | Floor-stand air conditioner and oblique flow fan thereof | |
| JP2008096020A (en) | Outdoor machine of air conditioner | |
| CN102900694A (en) | Air-conditioner and centrifugal fan thereof | |
| WO2021259022A1 (en) | Ventilation device and ventilation system | |
| CN1321838B (en) | Blower and air conditioning equipment having same | |
| CN101382320A (en) | Improved window type air-conditioner | |
| CN205064332U (en) | Fan and have its air conditioning system | |
| CN108386913B (en) | Air duct machine and air conditioning system | |
| CN204438437U (en) | Waste heat recovery at central air-conditioning device | |
| CN203163101U (en) | Window type air conditioner | |
| CN101726057A (en) | Structure for arranging outdoor fan of window type air conditioner | |
| JP2008202870A (en) | Outdoor unit of air conditioner | |
| CN102538096A (en) | Air conditioner with function of power generation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20140618 |
|
| EXPY | Termination of patent right or utility model |