CN1090740C - Air conditioning device - Google Patents

Abstract

The present invention provides a direct-flow fan, used in an air-condition indoor machine, having little abnormal sound and capable of achieving a high amount of wind. The chord length of a blade 6 arranged between discs 7 of a direct-flow fan impeller 10 varies. According to the invention, generation of a blade sound can be prevented, and a high mount of wind can be achieved.

Description

Air regulator

The present invention relates to room air conditioner, integrated air conditioner etc., particularly be used for the once-through type fan of indoor set.

In recent years, the energy-conservation requirement to room air conditioner day by day increases.In order to realize energy-conservationization of room air conditioner, ability (heat exchange amount of indoor heat converter) must be increased, and this ability will be increased for the same power input, then need increase the flow of indoor set.For this reason, must increase the air quantity of indoor fan.The way that increases this indoor fan air quantity has: improve the revolution of indoor fan, perhaps strengthen the external diameter that this indoor fan is the once-through type fan.Because the turbulent sound (being distributed in the sound of wide band frequency band) in indoor set when action is directly proportional with 7 to 8 powers of fan revolution, so during with the former way, if make air quantity increase by 30%, then noise also increases 9dB.In addition, owing to turbulent sound is directly proportional with 4 to 5 powers of fan external diameter, so when using the latter's way, the noise increase rests on 5dB, can not increase noise and increase air quantity, so tend to adopt the latter's way (turbulent sound).

But, the depth size of room air conditioner is restricted, when strengthening the external diameter of DC fan, gap smaller between DC fan and protruding nose and produce significant abnormal sound (special sound), in addition, because the distance between indoor heat converter and DC fan becomes near, wake flow produces sound by the blade of fan.

Reduce the prior art of this blade sound, for example have the Japanese patent gazette spy to open flat 6-129387 number (document 1) and the spy opens (document 2) flat 6-173886 number.In document 1 and document 2, in order to prevent the blade sound of DC fan (cross flow fan), the circumferential installing space of blade is made unequal interval, make the Zhou Fangxiang phase place difference of each blade, with the reduced peak sound, thus the noise of reduction entire machine.

Open in clear 57-148089 number (document 3) in that Japanese patent gazette is real, the central part of whole blade wheel make thin, thick arc is made at two ends.For the phase place of the noise that staggers obtains whole quiet effect, disposed the blade of distortion (screw type).The purpose that the spy opens clear 60-209693 number (document 4) is not to reduce the blade sound, but with document 3 similar shapes is arranged, and in document 4, in order to alleviate the deflection of cross flow fan axle, does the external diameter at fan two end part greatlyyer than the external diameter of central part.

In DC fan, reduce blade wheel and separation suction passage and blow out gap between the protruding nose of stream, just can increase air quantity.But, when the gap smaller between blade wheel and the protruding nose, then as previously mentioned, can produce the unusual sound that is called the blade sound.It is long-pending that the frequency of this unusual sound equals fan blade number and revolution, and have the noise intensity of high secondary frequencies, compares with the turbulent sound (sound that air stream produces when running into the stream wall) of frequency dispersion, and its peak value is high and have the frequency spectrum of spike, sounds very ear-piercing.The technology of above-mentioned document 1 and document 2 records, be in the Zhou Fangxiang random arrangement with blade, implement phase modulation, the frequency of distribution blade sound makes it be difficult for being heard, thisly merely blade arrangement is become unequal-interval, when a slice blade pass excess convexity nose, owing to the blade front end passes through simultaneously, so be not easy to prevent the unusual sound of blade sound.Therefore, when reducing the gap of protruding nose and blade, increased unusual sound again in order to increase air quantity.In addition, when heat exchanger and blade near the time, (velocity distribution of the air stream of coming by heat exchanger is little in the downstream of pipe because the wake flow of the pipe of heat exchanger flows into, air stream just produces unusual sound when arriving the blade of fan under this velocity distribution state), the blade change of tune gets significantly, noise intensity also increases simultaneously, so can not realize low noise and increase air quantity.

Put down in writing blade in the document 3 in axle direction rotation or distortion, its effect that prevents to produce the blade sound is better.But because it is big more arrive outer end diameter more, the fan internal drop of fan end is low, and the major part that flows to the air stream that comes from heat exchanger flows in the end, and the minimizing of the air mass flow of fan central part, its as a result total blast volume do not increase.In addition, because the air quantity of end increases, turbulent thereupon sound also increases.In the technology of document 4 records, blade is not imposed distortion.It is low and the problem of noise (turbulent sound, unusual sound etc.) arranged to exist air quantity.

The purpose of this invention is to provide a kind of air regulator that can suppress the generation of unusual sound and increase air quantity.Another purpose provides a kind of DC fan that can suppress the generation of unusual sound and increase air quantity.

To achieve these goals, air regulator of the present invention has the DC fan as indoor unit blowing fan, it is characterized in that, DC fan is divided into several sections that separate by plectane, blade external diameter at least one section vicissitudinous part between the plectane of this section, above-mentioned at least one section is different at the blade external diameter of adjacent portion with adjacent segment.

To achieve these goals, the feature of DC fan of the present invention is, DC fan is divided into several sections that separated by plectane, and the blade at least one section is with respect to the fan axis tilt, and above-mentioned at least one section is different to the blade external diameter of adjacent portion with adjacent segment.

In the DC fan that constitutes by several fan sections, if the blade external diameter of one of them fan section is changed, then Yi Pianpian blade becomes on the fan sense of rotation and has recess blade shape forward, tilts with respect to running shaft so the blade peripheral part is a trailing edge.Therefore, also tilt with respect to the pipe of protruding nose, heat exchanger, trailing edge is the wake flow by these pipes no longer simultaneously.Therefore, the frequency spectrum of crossing the sound that wake flow produces because of blade pass is disperseed, and unusual sound is suppressed.In addition, because the blade external diameter has big part and little part, the part wind speed big at external diameter is big, the part wind speed little at external diameter is little, so, can be the energetically local wind speed profile that changes blade wheel suction side, and also can change partly as the axial distribution that the blade sound produces the wake flow of the protruding nose of reason and tube for heat exchanger, thereby the blade sound can be suppressed.In the big part of blade external diameter, air quantity is than increasing before, owing to reducing the gap of protruding nose and blade more, so can realize high air quantityization.

Fig. 1 is the front profile diagram of expression one embodiment of the invention.

Fig. 2 is Fig. 1 embodiment's a profile diagram.

Fig. 3 is the External view of Fig. 1 embodiment's blade wheel.

Fig. 4 is the stereogram of Fig. 1 embodiment's blade wheel.

Fig. 5 is the front sectional view of Fig. 1 embodiment's blade wheel.

Fig. 6 is the profile diagram of Fig. 1 embodiment's blade wheel.

Fig. 7 is the figure of presentation graphs 1 embodiment's effect.Wherein, Fig. 7 (a) is expression noise difference and static pressure ratio and the graph of a relation of air quantity ratio.Fig. 7 (b) is an expression sound press intensity and the figure of the relation of air quantity ratio.Fig. 7 (c) is the figure that represents the relation of the isostatic pressing strength of existing example and this example and frequency respectively.

Fig. 8 is the figure of presentation graphs 1 embodiment's effect.Wherein, Fig. 8 (a) is the sketch of the position relation of protruding nose of expression and blade, and Fig. 8 (b) is the figure of the noise difference intensity difference of expression prior art and present embodiment with the relation in the gap of protruding nose and blade.

Fig. 9 is the front sectional view and the front elevation of the blade wheel critical piece of another embodiment of the present invention.

Figure 10 is the blade wheel front sectional view and the profile diagram of another embodiment of the present invention.

Figure 11 is the front sectional view and the front elevation of another embodiment of the present invention.

Figure 12 is the plane sectional view and the profile diagram of another embodiment of the present invention.

Figure 13 is that the unusual sound of expression produces principle and inhibiting figure.

Figure 14 is that the unusual sound of expression produces principle and inhibiting figure.

Figure 15 is the plane sectional view of another embodiment of the present invention.

Figure 16 is the figure of expression Figure 15 embodiment's effect.Wherein, Figure 16 (a) is the plane sectional view of Figure 15 embodiment's blade wheel 10, and Figure 16 (b) is expression prior art and Figure 15 embodiment's the air quantity and the figure of revolution relation.

Figure 17 is the front elevation of another embodiment of the present invention.

Figure 18 is the stereogram of another embodiment of the present invention.

Below, referring to figs. 1 through Fig. 8, Figure 13 and Figure 14 one embodiment of the invention are described.Fig. 1 represents the front sectional view of room air conditioner.It is critical pieces such as blade wheel 10 and prefilter 12 that heat exchanger 16, motor 23, DC fan are housed in decoration frame 28 inside.The left side is disposing motor 23, is suppressing the vibration-proof rubber 21 that motor 23 vibrates among the figure, is disposing the electric component 24, the circulating unit 25 that make action such as motor 23 grades at an upper portion thereof.With blade 6 and plectane 7 is that the blade wheel 10 of main composition parts rotates under the effect of motor 23, this rotation is to rotate from the bottom up on every side from the side that the portion of dissecing sees, carry out heat exchange by prefilter 12 and air-strainer 15 (not showing Fig. 1) inhaled air by heat exchanger 16 from the grid 13 and the upper grid 14 that are located at decoration frame 28 fronts and top, by separating suction passage and the protruding nose 11 that blows out stream, blade wheel 10, blow out again from the blow-off outlet 26 that is provided with vertical wind direction board 18, horizontal wind direction board 19.For the external diameter that makes blade 6 in 7 variations of plectane, the outer peripheral portion of the blade of blade wheel 10 is that trailing edge is with respect to tilting above the protruding nose 11.Vertical wind direction board 18 is configured in the little part of external diameter of blade wheel 10.

Fig. 2 is the profile diagram of room air conditioner shown in Figure 1.Rear portion at blade wheel 10 is provided with the cover 17 that constitutes air flow path, passes through the pipe arrangement 20 of refrigeration agent at its rear portion.Heat exchanger 16 by forming by 3 grades (under the situation of dehumidifying, last 2 grades as heater, following 1 grade as cooler) major part of leaked-in air since the rotation of blade wheel 10 along cover 17 from the blow-off outlet air draft.

The following describes the principle of DC fan air-supply.When the blade 6 that is configured in 7 outer peripheral portions of plectane when clockwise direction rotates, according to the airfoil theory of fluid engineering, the blade group 6 who is positioned at protruding nose 11 upstream sides changes the interplane wind speed of blade and turns to antitriptic current (pressure rising).And by protruding nose 11 and cover 17 cingens blade groups 6 make the interplane air-flow of blade on one side speedup (the interplane air-flow of this part is become concavity blade speedup forward in sense of rotation) on one side pressure rise and blow out.At this moment, DC fan (blade wheel 10) itself is that the center turns clockwise with the axle, and air stream is that the center turns clockwise to be partial to protruding nose 11 sides point from the axle center.

This is because the pressure of protruding nose 11 upstream sides is low, there is the portion of air stream that blows out side of wind direction board 18 to drain to protruding nose 11 upstream sides from blowing out the side pond by the gap between blade 6 and the protruding nose 11, blade group 6 by protruding nose 11 upstream sides sucks, and this part produces the cause that circulation promptly produces vortex.Leakage rate in the upstream and downstream of protruding nose 11 is that the amount that blows out not yet in effect is directly proportional with the gap of protruding nose with the pressure difference and the blade 6 of protruding nose 11 upstream and downstream, and when the blade 6 and the gap of protruding nose 11 were big, this leakage rate accounted for 20% of the whole air quantity of room air conditioner sometimes.Therefore, reducing this gap also is a key element that increases air quantity.

At this moment, in the air-flow that leaks at a high speed from the blade 6 and the gap of protruding nose 11 and the fin of 10 same directions ground rotations of blade wheel and inflow heat exchanger, and at an upper portion thereof, the low speed flow that comes out from heat exchanger is towards a central direction inflow of blade wheel.Therefore, blade 6 rotation and by this part time in the distortion head piece (claiming that generally such air-flow is that slip-stream or speed distortion are flowed or wake flow) by the distribution of high wind speed.Like this, when in the blade pass ground wake flow, bring out Yang Li at blade and change.The rotation of a slice blade once can be brought out once the strong power of raising and change, because plectane 7 peripheries at the blade wheel are disposing some blade (for example Z sheet), so, when the blade wheel rotates one time, can bring out the power of raising for Z time on the blade wheel changes, when revolution is N time (RPS), on the blade wheel, brings out Yang Li and change with the NZ frequency.According to the Ka Er theory,, blade can sound when Yang Li changes when bringing out.This is the Der Grundsatz der Maschinen that the blade sound produces, and the blade sound has periodically, is very sharp very ear-piercing unusual sound.

The sound press intensity of this sound is obtained like this: the sound press formula (2) of the power of raising variation (neumann's formula) substitution Ka Er that brings out on a slice blade in (1) formula, the sound press strength formula of substitution again (3) formula is obtained.

(formula 1) $L(\mathrm{\ω})\underset{0}{\overset{b0}{\∫}}\{2\·\mathrm{\π}\·\mathrm{\ρ}\·U\·\mathrm{wp}\·c\·b\·\sin \mathrm{\φ}(\cos \mathrm{\φ}\left(f(\mathrm{Ff}\left(\mathrm{\ω}\right)+\mathrm{\αF\α}\left(\mathrm{\ω}\right))\right)+S\left(\mathrm{\ω}\right))\}\mathrm{db}\…\left(1\right)$

In the formula, L (w), P, U raise power (function of frequency w), density, representative mean velocity (at interplane wind speed, be arranged in the DC fan that fan blows out side in the keynote source, U is directly proportional with air quantity) for changing; Wp is near the rotational speed of circuit vortex protruding nose 11 and the speed difference that passes through the air of heat exchanger thereon (usually, protruding nose 11 is more little with the gap of blade, and Wp is big more); C, b be respectively the chord-length of blade and as the blade that produces blade sound reason the axle direction length of the blade during at the same time by wake flow (usually by protruding nasal portion), be the sharf direction length of 7 of plectanes as the extreme length of fan key element; φ is the angle that forms in chordwise with Wp; F is respectively the maximum height (the warpage situation of the ordinary representation wing) of blade with respect to chord-length, and α is the angle of injecting that flows into air and blade; Ff (W), F α (w) are respectively the blade songs, have the power of raising that produces when injecting the angle to change item; S (w) is the variation Yang Lixiang that produces according to the Wp composition.a ₀, X, Xi, S represent velocity of sound respectively, direction cosine, all length of plurality of fans key element of the distance from fan to the sound observation station, fan and observation station; P ₀Expression is as the sound press intensity of noise intensity benchmark.

As can be known, the time diffusion that Yang Li changes just becomes the blade sound from formula (1), formula (2) and formula (3).On the left side of (1) formula, the factor that can reduce the Yang Li variation is U, Wp, C, b, and U is directly proportional with air quantity, so constant when same outer diameter as.In addition, when protruding nose and interlobate gap smaller, it is big that Wp becomes, so desire will realize high air quantityization, this Wp become be greatly direction from now on, and this can not reduce.Therefore, only change c or b of the factor that can reduce the blade sound effectively.And, b is that blade pass excess convexity nose is neighbouring, the blade sound produces minimum length, and c is the chord-length of the blade of this minimum length part, so, must make this length change, so that this length does not form (make and form the phase difference item in the w item) at the same time at axle direction.

Fig. 3 represents to be used to lower the outward appearance of this blade wheel 10.Blade wheel 10 mainly is made of wheel hub 2, end face plectane 4, blade 6, plectane 7, end plates 8 and axle 9.

Blade installation position between plectane changes, and as described later, this is because the cause that the shape of blade 6 changes between plectane.From in appearance, the external diameter of blade reduces towards its external diameter of next plectane from the end face plectane 4 that wheel hub 2 is arranged, and increases again at this next one plectane place external diameter, so repeatedly up to the plectane that axle 9 is arranged.

Fig. 4 represents the stereogram of one section blade wheel between the plectane.On the end face plectane 4 of blade wheel 10, wheel hub 2, axis hole 1 and screw hole 3 are arranged.Diminish gradually to width towards plectane 7 its blades from the end face plectane 4 that wheel hub 2 is arranged.As shown in the figure, blocks of blade is not flat, but its width direction is a circular arc on whole length direction, and blade is originally non-warping in length direction.

This fan is to make like this: fan material is injected in several moulds that depth attenuates, in order to make another section blade wheel be bonded in the back side of plectane, with forming the such mould extruding that some protuberances are arranged of recess, just formed plectane of isomorphic some blade all-in-one-pieces after the demoulding, make several such plectanes, above-mentioned plectane bonding or the required number of welding has just been made blade wheel 10.The product of same shape can be produced in batches, when fan-shaped when being non-warping, while needn't reverse the demoulding when the demoulding, so can not increase cost, can provide unusual sound few and fan that air quantity is big.In addition, between end face plectane 4 and axle 9, be provided with vibration absorbing structure (figure does not show).

In the present embodiment, be to make the blade wheel with plastics, when making this blade wheel with steel plate or aluminium sheet, blade makes the total length of blade wheel at length direction.

Profile diagram after Fig. 6 represents to cut off along the axle direction of blade shown in Figure 5 wheel 10.Blade 6 up and down is orthographic projections of blade, blade be neat straight line shape by blade wheel inner face side, outer circumferential side has simple variation.Between end face plectane 4 and wheel hub 2, vibration-proof rubber 5 is arranged.To the opposing party's plectane 7, the external diameter of blade 6 increases gradually from a circumference plate 7.

Below with reference to Fig. 6 to Fig. 8, Figure 13 to Figure 14 describes the effect that the blade wheel 10 with above-mentioned structure can suppress unusual sound and increase air quantity in detail.

The sectional view of one section blade wheel 10 of Fig. 6 (a) expression is installed with blade between plectane 7.In the blade outer diameter D ₂Little a-a section (Fig. 6 (b)) and blade outer diameter D ₂In the big b-b section (Fig. 6 (c)), the chord-length C of blade is different.Because such shape arranged, be that best twisted shape blade is compared with being considered to reduce unusual sound so far, its effect is better.

The peripheral part of blade 6 or hinder marginal part, from the a-a section towards b-b section direction, stagger with respect to sense of rotation in its position, in other words, the long limit of blade tilts with respect to the fan axis, so when fan rotates, the blade-section of b-b section one side is earlier by near the protruding nose, behind the blade of a-a section one side by (this is not because leaf curling, but because the wing chord length of the blade of b-b section is long, to the cause of the circumferencial direction extension of plectane).At this moment, as shown in figure 13, near the blade 6 that is rotating the protruding nose is two strands of air-flows of crosscut in turn, and one is the air-flow that spills from the gap of above-mentioned protruding nose 11 and blade and sucked by blade, and another strand is the slower air-flow that comes by heat exchanger.The part that exists this wind speed difference is called the part that has speed distortion.If be parallel to the fan axis the blade crosscut this have the part of speed distortion, then because the place of this velocity distribution inequality of blade front end crosscut side by side, so as previously mentioned, produce by the sound of the frequency of the product representation of blade sheet number and rotation number with and the high order higher harmonics.

But, blade shape according to present embodiment, has time difference ground by this speed distortion part at axle direction blade 6, (1) the minimum length b of the generation blade sound in the formula diminishes, and the minimum length b of this generation blade sound lingeringly passes through one by one, produces phase difference because of time lag in the w item, produce phase modulation in Yang Li changes, difficult generation has high-frequency blade sound.This acts in the blade structure of unequal-interval and can not get, but can obtain equally in twisted blade.

According to present embodiment, because the blade external diameter changes vertically, the part air quantity that external diameter is big is just big, and wind speed is fast, otherwise the part wind speed that external diameter is little is slow.Therefore, as shown in figure 13, also can make positive velocity distribution in the fan shaft direction, the time that wind enters blade changes, and, causes phase difference energetically that is, so with similarly above-mentioned, the effect that reduces the blade sound is remarkable.This effect is that above-mentioned twisted blade can not get.

Another reason that produces the blade sound is the wake flow that the pipe from heat exchanger comes out.Figure 14 represents the wind speed profile in heat exchanger downstream.The suction air stream that comes from heat exchanger that produces along with the rotation of fan does not have even velocity and distributes, and the downstream of the heat exchanger 16 that is made of fin 29 and pipe 30, particularly produces the slow wake flow of wind speed in the downstream of pipe.The direction if the blade of fan parallels to the axis, the part that changes of the long limit front end crosscut velocity distribution side by side of blade then, its result produces unusual sound.In twisted blade, though the part that side by side changes by velocity distribution not can not suppress the generation of to a certain degree above unusual sound.

According to the blade shape of present embodiment, because whole inflow air stream all axially changes, thus can disperse frequency spectrum with above-mentioned same sound effectively, thus the generation of blade sound can be suppressed.

About air quantity, as previously mentioned, the external diameter of DC fan increases then just increase of air quantity.As previously mentioned, the way of increase air quantity has the fan of raising revolution and increases external diameter.Compare with the method that improves the fan revolution, increase external diameter and can suppress the noise that causes by turbulent sound.In the present embodiment,, then can guarantee and identical before air quantity, because the part air quantity that external diameter is big in the fan section increases, so whole air quantity can increase in this part if the little part of external diameter is made identical with before external diameter.

Can suppress the shape that unusual sound produces because blade is made, protruding nose 11 and blade wheel 7 can strengthen the diameter of blade wheel, thereby can suppress unusual sound and increase air quantity near configuration.

Blow out the little part of wind speed owing to vertical wind direction board 18 shown in Figure 1 being configured in,, also can reduce the wind direction board pressure loss that causes because of wind speed so can reduce the sound that produces from wind direction board from the blade wheel.

Fig. 7 represents above-mentioned blade wheel 10 experimental results that are assembled on the room air conditioner.Experimental condition is: blade wheel external diameter is certain, and the existing blade wheel (external diameter 90mm) of unequal-interval (being also referred to as random pitch) is 1.03 (little external diameter is 90mm, and big external diameter is 93mm) with the ratio of the external diameter of present embodiment blade wheel 10; Revolution is certain, 100% compares with respect to the static pressure characteristic of air quantity at this moment and noise properties hypothesis in the operation point of blade wheel before being.In addition, noise spectrum all be air quantity than the situation that is 100%, the gap between blade external diameter and protruding nose, before blade wheel is 9mm, is 5mm in the present embodiment.Contrasting the Der Grundsatz der Maschinen that unusual sound produces, is strict for the experimental condition of present embodiment.

External diameter is compared with the random pitch fan than being under 1.03 the situation, and noise properties (be not only unusual sound, also comprise turbulent sound) is identical, and air quantity, static pressure improves, and is suitable for high air quantityization.In addition, about noise spectrum, 1 time, 2 times spike composition of blade sound is very outstanding in before the blade wheel, and in the present embodiment, the spike frequency spectrum of blade sound has not had, and becomes mild shape.The effect that therefore, the unusual sound of good reduction is arranged.

Fig. 8 is in the expression two blades wheel, changes the gap between blade and protruding nose, is the noise intensity of a timing and the comparison diagram of blade loudness of a sound degree at air quantity.Blade before is 8mm when following in above-mentioned gap, and its noise intensity, blade loudness of a sound degree all increase, and when the gap is 10mm when following, though blade loudness of a sound degree is low, increases from the throughput of this clearance leakage, and causes that noise intensity increases.And the blade of present embodiment, when the gap of blade maximum outside diameter part and protruding nose during at 4.5mm, the blade sound is not remarkable, and noise intensity is also low, has same tendency with before blade under the big situation in gap.From this result as can be known, in the room air conditioner of present embodiment, the blade sound produces less and realizes that the optimal gap of high air quantityization is 4.5-6.4mm.

Among Fig. 3, blade 6 seems that with respect to running shaft be distortion, perhaps rotate, but as previously mentioned, this is because the chord-length of blade changes.

Among Fig. 3, fan is made of 7 fan sections, but is not limited to 7, can be individual arbitrarily, and for the blade wheel of equal length, the increase of fan section number is the inclination steepening of blade 6 external diameters then.In addition, blade 6 also can be the configuration of unequal-interval ground.

According to present embodiment, can suppress above-mentioned unusual sound and realize the effect of high air quantityization except having, owing to change at the intersegmental external diameter that makes of fan, so simple structure, compare making easily with twisted blade, do not increase cost thereby can reach high air quantity, because blade is a lineal shape, the air quantity of DC fan.The prediction of Pressure characteristics, noise-predictive all more easily carry out.Can shorten the design time of exploitation air conditioner.Compare with the curve-like blade, can improve the blade sections integral intensity.

Fig. 9 represents another embodiment of the present invention.In above-mentioned the 1st embodiment, it is to be simple straight line from a circumference plate to the opposing party's plectane to change that the blade external diameter in 1 fan section (section between from the plectane to the plectane) changes.And among Fig. 9 (a), in the fan section some with the wheel of blade before similarly, can be indeclinable part, still, in the fan section,, external diameter is changed particularly with the gap of protruding nose part little, that the blade external diameter is big.So, the variation of external diameter is that rake ratio the foregoing description of trailing edge is big, can prevent the generation of blade sound more.Fig. 9 (b) is illustrated in each fan section, and the variation of external diameter is concavity with respect to running shaft, and this also can obtain same effect.Be to be concavity in the present embodiment, but convex also can obtain same effect.

The variation that is illustrated in external diameter in the fan section among Fig. 9 (c) comprises from being increased to the minimizing two states.Like this, bigger in the inclination of fan section intra vane, even heat exchanger, the more close fan of protruding nose also can make the frequency spectrum of sound disperse, thereby suppress the generation of blade sound, realize high air quantityization.

Figure 10 represents another embodiment of the present invention.The axial section of Figure 10 (a) expression blade wheel 10, Figure 10 (b), a-a, the b-b section of Figure 10 (c) expression Figure 10 (a).The chord-length (c) of blade 6 is changed at some places, the external diameter of blade and internal diameter are changed at some places.Though this structure is not suitable for producing in batches, but (the Ka Er theory is thought according to the Ka Er theory, the generation of fluid sounds such as blade sound, be that the time diffusion that the variation of the power on the known aerofoil power of promptly raising changes promptly produces sound), the variation of promptly raising the power relative time of the load variations of blade changes big than the foregoing description in the axial direction, because can change the fan upstream side wind speed profile on the axle direction energetically, so can prevent the generation of blade sound.

Figure 11 represents another embodiment of the present invention.It is to be convex with respect to axle near 1 fan section central authorities that Figure 11 (a) expression chord-length changes, and Figure 11 (b) expression is concavity, and Figure 11 (c) is illustrated in the parallelism that the blade outer radius portion admits of the demoulding gradient, is provided with parallel part in the blade outer radius portion.Its effect and the foregoing description are same, can reduce unusual sound.

Figure 12 represents another embodiment of the present invention.Need to be provided for to separate suction passage and blow out stream and improve the protruding nose 11 of pressure in DC fan, in the above-described embodiments, protruding nose is indeclinable straight line shape, and in the present embodiment, in the little part of blade external diameter, reduces and the gap of 11 in protruding nose.

When using above-mentioned various blade of the present invention to take turns, usually, protruding nose 11 is big in the little part of blade external diameter with the gap of blade 6, and the part big at external diameter is little.As previously mentioned, the keynote source of DC fan is the big part of blade external diameter, so sound produces in the big part of blade 6 external diameters.In the little part of blade external diameter, even reduce gap with protruding nose 11, sound increases hardly and air quantity increases, based on this point, making towards the protruding shape of fan shaft direction at the protruding nose 11 of the little part of blade 6 external diameters.Even the gap between protruding nose and the blade external diameter all remains the shape of setting protruding nose definitely approximately in any position.In the present embodiment, air quantity can increase by 30% approximately when same noise.

In the present embodiment, be to reduce gap with protruding nose in the little part of blade external diameter.Realize high air quantityization.For the high air quantityization that realizes more increasing, also can increase protruding nasal height degree in the little part of blade external diameter, that is, make down inclination with respect to trailing edge, reduce the gap more.Like this, in the time of near trailing edge passes through protruding nose, can form bigger phase difference, thereby suppress the generation of blade sound and can realize higher high air quantityization.

As mentioned above, protruding nose is made the shape that changes along the blade outer rim, have good effect aspect the control leakage.But when product was assembled, under the situation of the axle direction position deflection of fan, the gap of blade and protruding nose can sharply diminish, and produces ear-piercing blade sound.The embodiment who the following describes can address this problem, even there is skew the axle direction position of fan when product is assembled, also can prevent the generation of blade sound, can realize high air quantityization quietly.

Promptly, in at least one fan section of DC fan, constituting on the line or face of protruding nose outer rim, the point of inflexion that the gap is changed is being arranged, the part that diminishes at the blade external diameter, protruding nose is protruded to the stream side, when the assembling air conditioner, even fan offset axis direction, the gap can not diminish sharp yet, the blade sound can be very not ear-piercing, can be with the high air quantityization of quiet realization.

In addition, protruding nose outer rim is made opposite with the inclination of blade outer rim skewed, can be made the wake shape of the tube for heat exchanger that flows into blade on the fan shaft direction, form variation, so also can prevent the generation of blade sound.

If with above-mentioned both uses that combine, then can prevent the blade sound that produces by the interference of fan and protruding nose, also can prevent the interference of the wake flow of tube for heat exchanger and blade and the blade sound that produces.

Figure 15 represents that blade outer rim and protruding nose are at the axial changing condition of rotation.The shape of the axle direction changing condition of 3 fan sections of expression and the protruding nose that is adjacent.The blade 6 of blade wheel 10 blade external diameter from left to right increases simply.The shape with blade outer rim adjacent portion of protruding nose 11 is such: protrude to the stream side in the part that the blade external diameter is little, to reduce protruding nose 11 and ground sheet 6 outer intermarginal gaps.In addition, different in protruding nose shape and the foregoing description, it is not intersegmental along blade 6 outer rim change in shape at fan, but protrudes to the stream side in the little part of blade 6 external diameters, has point of inflexion ground and change on the fan rotation axis direction.

Protruding nose 11 is made above-mentioned shape, can prevent to become big because of blade 6 external diameters reduce to cause the gap with protruding nose 11, thereby prevent that this gap from becoming most flow leakage, realize high air quantityization, when air conditioner is assembled, even some skew of the mounting point of fan, blade 6 can sharply not narrow down with the gap of protruding nose 11 yet.Therefore, the generation of blade sound can in the product of producing in batches, not have nothing in common with each other (difference that can eliminate quality).In addition, in an embodiment, only establish a point of inflexion, also can establish several.

Figure 16 represented fully to prevent the blade sound from producing and the time quiet effect, the following describes the situation that protruding nose 11 is equivalent to half length of fan section.As shown in the figure, fan external diameter minimum is 90mm, be 93mm to the maximum, the fan segment length is 60mm, protruding nose gap is 4.7mm at fan maximum outside diameter place, at the minimum outer diameter place is 4.5mm, and the protruding nose of partly locating at the fan maximum outside diameter is parallel to fan rotation axis, from sharply narrow down towards fan minimum outer diameter portion gap midway.

Compare with the situation of before protruding nose shape invarianceization, under identical air quantity, can reduce the noise of 1dB approximately.This means under identical noise, can realize 0.3m approximately ³The high air quantityization of/min.

Figure 17 is an another embodiment of the present invention.With the foregoing description similarly, the external diameter of the blade of DC fan wheel 10 increases from left to right, the outer rim of blade 6 tilts with respect to running shaft, and the top of protruding nose 11 is also towards tilting in the opposite direction with blade lean side.According to this structure, the wake flow that comes out from the pipe 29 of heat exchanger 6 is subjected to the influence of protruding nasal height degree, and it is destroyed with phasic property on the running shaft direction of fan, thereby is difficult for producing the blade sound.

Figure 18 is the indoor set of another embodiment of the present invention, represents the stereogram of protruding nose and blade wheel near part.Make the protruding nose 11 gaps shape of the protruding nose 11 of setting axially in protruding nose 11 and blade 10 adjacent parts (this adjacent portion as shown in Figure 2) with changing, in addition, make the wake flow that comes out from the pipe 20 of heat exchanger destroy the height of setting protruding nose 11 with phasic property ground at axle direction.According to present embodiment, almost can prevent the generation of blade sound fully.

According to above-mentioned various embodiments, can prevent to produce ear-piercing blade sound, realize saving the high air quantityization of electric power.Otherwise,, then can realize better quietization if do not change air quantity.In addition, if do not change air quantity, owing to reduce the generation of unusual sound, the external diameter that does not change DC fan just can reduce the gap of protruding nose and fan, so can realize the miniaturization of room air conditioner.In addition, need not the generation that the twisted blade wheel just can prevent the blade sound, can realize low cost.In addition, even, also can realize the low-noise air conditioner of anhydrous vibration, can realize the miniaturization of machine because of the high-pressure trend of DC fan increases the pressure loss of heat exchanger.In addition, DC fan can be widely used in room air conditioner, self-contained air conditioner, and the air cooling e-machine of OHP, PC etc., so can make these machines have the effect of miniaturization, high air quantity, low noise.

According to the present invention, can prevent the high air quantityization that produces ear-piercing blade sound and can realize saving electric power.Otherwise,, then can realize better quietization if do not change air quantity.In addition, if do not change air quantity, owing to reduce the generation of unusual sound, the external diameter that does not change DC fan just can reduce the gap between protruding nose and the fan, so can realize the miniaturization of room air conditioner.

Claims (18)

1. air regulator, have DC fan as indoor unit blowing fan, it is characterized in that, DC fan is divided into the plurality of sections that separates by plectane, the part that blade at least one section has external diameter to change between the plectane of this section, the blade external diameter in the adjacent portion of above-mentioned at least one section and adjacent segment is different.

2. air regulator as claimed in claim 1 is characterized in that, the corresponding part, position in that the blade external diameter with DC fan diminishes is setting vertical wind direction board.

3. air regulator as claimed in claim 1 is characterized in that, above-mentioned air regulator has the protruding nose of separating suction passage and blowing out stream, makes the front end change in shape of this protruding nose.

4. air regulator as claimed in claim 3 is characterized in that, the variation and the blade shape of the front end shape of above-mentioned protruding nose adapt.

5. air regulator as claimed in claim 3 is characterized in that, the variation of the front end shape of above-mentioned protruding nose is, becomes big with the inclination of the little corresponding part of part of blade external diameter.

6. air regulator as claimed in claim 3 is characterized in that, the variation of the front end shape of above-mentioned protruding nose is to make the running shaft direction variation of the height of this protruding nose along DC fan in above-mentioned section.

7. air regulator as claimed in claim 1 is characterized in that, above-mentioned air regulator has the protruding nose of separating suction passage and blowing out stream, and the shape of this protruding nose matches with blade shape.

8. air regulator, have DC fan as indoor unit blowing fan, it is characterized in that, this DC fan is divided into the plurality of sections that separates by plectane, blade at least one section tilts with respect to the fan axis, and above-mentioned at least one section is different at the blade external diameter of adjacent portion with adjacent segment.

9. air regulator as claimed in claim 8 is characterized in that, above-mentioned air regulator has the protruding nose of separating suction passage and blowing out stream, and the shape of this protruding nose matches with blade shape.

10. air regulator, have DC fan as indoor unit blowing fan, it is characterized in that, this DC fan is divided into the plurality of sections that separates by plectane, blade at least one section tilts with the protruding nose that blows out stream with respect to separating suction passage, and above-mentioned at least one section is different to the blade external diameter of adjacent portion with adjacent segment.

11. air regulator as claimed in claim 10 is characterized in that, the shape of above-mentioned protruding nose matches with blade shape.

12. air regulator, have DC fan, it is characterized in that, DC fan is divided into the plurality of sections that separates by plectane as indoor unit blowing fan, the chord-length of the blade at least one section changes, and above-mentioned at least one section is different at the blade external diameter of adjacent portion with adjacent segment.

13. air regulator as claimed in claim 12 is characterized in that, the corresponding part, position in that the blade chord-length with DC fan diminishes is setting vertical wind direction board.

14. air regulator as claimed in claim 12 is characterized in that, above-mentioned air regulator has the protruding nose of separating suction passage and blowing out stream, and the shape of this protruding nose matches with blade shape.

15. a DC fan is characterized in that DC fan is divided into the plurality of sections that is separated by plectane, having the blade external diameter at least one section is the part that changes between the plectane of this section, and above-mentioned at least one section is different at the blade external diameter of adjacent portion with adjacent segment.

16. a DC fan is characterized in that DC fan is divided into the plurality of sections that is separated by plectane, the blade at least one section tilts with respect to the fan axis, and above-mentioned at least one section is different at the blade external diameter of adjacent portion with adjacent segment.

17. a DC fan is characterized in that DC fan is divided into the plurality of sections that is separated by plectane, the blade chord-length at least one section changes, and above-mentioned at least one section is different at the blade external diameter of adjacent portion with adjacent segment.

18. a DC fan is characterized in that being formed by connecting by several fan sections, this fan section has the blade that changes at plectane place external diameter, in the adjacent portion of fan section, and blade external diameter difference.

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