CN1171021C - Axial fans and variable pitch blade axial fans - Google Patents

Abstract

The axial fan with air separator has low noise and high performance. An annular air separator (5) is provided at the outer edge of the casing (2), and a guide vane (16) is provided in the airflow path (6) of the air separator (5), whose function is to drive the airflow The tip of the blade (1) guides the upstream of the rotor blade (1), and the inner edge of the guide vane at the air separator inlet (6a) is closer to the outer diameter of the casing than the inner diameter of the plate shell (2) , so that the interaction between the airflow (8a) from the rotor blade (1) and the guide vane (16) can be slowed down, and the interaction between the pressure field formed around the rotor blade and the guide vane can also be slowed down.

Description

Propeller fan and inclination changing blade axial-flow fan

Technical field

The present invention relates to contain the propeller fan and the inclination changing blade axial-flow fan of air separator, the effect of contained air separator is to improve the low discharge service behaviour.

Background technique

Do not award utility model patent 3-87900 number for improving the Japan that as seen the low discharge service behaviour is provided with air separator on propeller fan example announced.

Air separator is made of outer wall, sidewall and stator, roughly aligns with the casing inner diameter location in the position of stator inner edge.This air separator contains two openings, and the suction port as air flow path extends to half of movable vane axial length from the upstream edge of movable vane; Another is positioned at movable vane entrance point upstream one side as the air outlet of air flow path, and stator is distributed in the suction port place of air flow path, thereby the stator inner edge also is positioned at the suction port place.Stator can be eliminated the rotation component velocity of the air-flow from the movable vane blade tip to air separator air flow path suction port like this with respect to the back-flexing of movable vane sense of rotation.

In being provided with the propeller fan of air separator, the contrary air-flow that action of centrifugal force can make movable vane blade tip edge produce is imported in the air flow path via the air separator suction port.After the air flow path that flows into air separator, the stator in the air flow path can make air-flow lose its rotation component velocity gradually, and when being flowed out by the air outlet of movable vane upstream, this air-flow can incorporate to air-flow.

In traditional containing in the air separator propeller fan, roughly align with the inner diameter location of casing in the position at stator edge, so just, produced first problem: the air-flow from the movable vane blade tip to air separator can interact with stator, the pressure field that forms around the movable vane also can interact with stator, and these effects will increase noise.

In addition, in traditional containing in the air separator propeller fan, stator only appears at the suction port or the place, air outlet of air separator, so just, brought second problem: the effect of eliminating air-flow rotation component velocity in the air separator is the poorest, thereby the operating range expansion effect that air separator had and pressurization are also lower.

Also there be following the 3rd problem in the propeller fan of traditional configuration air separator: stator is the resolution element with respect to outer wall, need the two be assembled together with the technology of welding and so on, so assembly process is comparatively complicated.

In addition, also there be following the 4th problem in traditional air separator propeller fan that contains: the outer wall of air separator is parallel with casing, therefore strong disturbance can take place in the air-flow that passes air separator, will weaken operating range expansion effect and pressurization that air separator has like this.

Summary of the invention

The objective of the invention is to make the propeller fan and the inclination changing blade axial-flow fan that contain air separator to possess high-performance, wide operating range, low noise and other advantages.

For solving first and second problems, the invention provides a kind of propeller fan, comprising: the air separator that forms by outer wall and sidewall in the outside of the casing that surrounds movable vane; Be arranged at a plurality of straightening vanes in the stream of this air separator; Relative with above-mentioned movable vane in above-mentioned stream, as the suction port of the inlet of above-mentioned air separator; Air outlet as the outlet of above-mentioned air separator, it is characterized in that, move back to external diameter one rear flank than the inner diameter location of said machine casing the position of inner edge that is positioned at the above-mentioned straightening vane of above-mentioned suction port, if the height of above-mentioned movable vane is that the inner edge of H, above-mentioned straightening vane and the distance between the above-mentioned movable vane blade tip are d, is between 0.07 to 0.13 by the represented above-mentioned amount that retreats amplitude of d/H then.

In addition, the present invention also provides a kind of propeller fan, comprising: the air separator that forms by outer wall and sidewall in the outside of the casing that surrounds movable vane; Be arranged at a plurality of straightening vanes in the stream of this air separator; Relative with above-mentioned movable vane in above-mentioned stream, as the suction port of the inlet of above-mentioned air separator; Air outlet as the outlet of above-mentioned air separator is characterized in that; Above-mentioned straightening vane only is arranged at above-mentioned suction port, move back to external diameter one rear flank than the inner diameter location of said machine casing the position of inner edge that is positioned at the above-mentioned straightening vane of above-mentioned suction port, if the height of above-mentioned movable vane is that the inner edge of H, above-mentioned straightening vane and the distance between the above-mentioned movable vane blade tip are d, is between 0.07 to 0.13 by the represented above-mentioned amount that retreats amplitude of d/H then.

The air separator at propeller fan casing outer rim place also can adopt following structure: its suction port is relative with movable vane blade tip leading edge one side; The air outlet in its annular airflow path is positioned at the movable vane upstream; Several stators extend to the air outlet from the suction port of air flow path and sentence and form the air separator main body; Each stator is coupled together by near the link the movable vane blade tip; The stator inner edge position at air separator suction port place increases progressively along downstream direction.

In addition, the air separator at inclination changing blade axial-flow fan outer rim place can adopt following structure: its suction port is relative with movable vane (its blade angle can change with working flow and change) blade tip leading edge one side; The air outlet in its annular airflow path is positioned at the movable vane upstream; Several stators are positioned at the suction port place of air flow path, or extend to the place, air outlet from the suction port of air flow path; Each stator is coupled together by near the link the movable vane blade tip; Under the low discharge operating conditions, part not relative with movable vane on the stator inner edge is positioned at the position of radially outwards leaving the casing inner radius.

The air separator at inclination changing blade axial-flow fan casing outer rim place also can adopt following structure: its suction port is relative with movable vane (its blade angle can change with working flow and change) blade tip leading edge one side; The air outlet in its annular airflow path is positioned at the movable vane upstream; Several stators are positioned at air flow path suction port place, or extend to the place, air outlet from suction port, thereby constitute the main body of air separator; Straightening vane is coupled together by near the link the movable vane blade tip; Outwards pass the stator inner edge position at air separator air flow path suction port place, and its passing amount is successively decreased along downstream direction.

In addition, the air separator at propeller fan or inclination changing blade axial-flow fan casing outer rim place can adopt following structure: its suction port is relative with movable vane blade tip leading edge one side; The air outlet in its annular airflow path is positioned at the movable vane upstream; Several stators are positioned at air flow path suction port place, or extend to the place, air outlet from the air flow path suction port, thereby constitute the air separator main body; Each stator is coupled together by link; The part that constitutes suction port on the stator is with respect to the back-flexing of movable vane sense of rotation, and the angle between bending direction and the running shaft is greater than the movable vane established angle.

In addition, at above-mentioned first to the 3rd problem, the air separator at propeller fan or inclination changing blade axial-flow fan casing outer rim place adopts following structure: air separator outer wall and stator are made of some resolution elements; Resolution element is some metal tubes that cut part segmental arc shell; Several resolution elements are to be circular layout between the sidewall of casing outer rim and connected as a whole by near the link the movable vane blade tip; The a certain inner edge of resolution element is positioned at the position of radially outwards leaving the casing inner radius.

As special case, near the link that the movable vane blade tip straightening vane or resolution element is coupled together has wing cross section.

Still as special case, link is made of pipe and flat board.

At above-mentioned the 4th problem, the annular air separator at propeller fan casing outer rim place can adopt following structure: its suction port is relative with movable vane blade tip leading edge one side; The air outlet of its air flow path is positioned at the movable vane upstream, and the air-flow at movable vane blade tip place can be directed to movable vane upstream one side; Stator extends to the place, air outlet from the air flow path suction port; The external diameter of air separator successively decreases along downstream direction.

In air separator, stator extends to the place, air outlet from suction port, its inner rim is set at the position beyond the casing, can slow down the interaction between it and movable vane blade tip place air-flow like this, also can slow down the interaction between formed pressure field around it and the movable vane, thereby noise is reduced, simultaneously, stator can be eliminated the rotation component velocity of the air-flow that enters air separator effectively, thereby has avoided the weakening of operating range expansion effect and pressurization.

In addition, if the outside passing amount of stator inner edge position increases progressively along downstream direction, the suffered weakening degree of air separator suction port place air-flow component velocity elimination effect will reduce so, can reach noise reduction when keeping operating range expansion effect that air separator has and pressurization like this.

For inclination changing blade axial-flow fan, stator inner edge (its certain part can't be relative with the movable vane blade tip under low flow condition) is positioned at the position beyond the casing inner radius, under big flow operating conditions, interaction between movable vane blade tip place's air-flow and stator will be gentler, the pressure field and the interaction between the stator that form around the movable vane are also more weak, thereby noise will be lower.In addition, under the low discharge operating conditions, stator has the elimination effect to air-flow rotation component velocity at air separator suction port place, so the operating range expansion effect that air separator had and pressurization can be not weakened.

In the air separator of the logical bent machine of inclination changing blade axial-flow, if making the outside passing amount of stator inner edge successively decreases along downstream direction, so under the intermediate flow operating conditions between high flow capacity and the low discharge, by the interaction between air separator charge air flow and the stator and will be more weak by three the noise that interaction caused of movable vane ambient pressure field and stator.In addition, stator still has the elimination effect to air separator charge air flow rotation component velocity under the intermediate flow operating conditions, so operating range expansion effect that air separator had and pressurization can be not weakened.If with the stator at air separator suction port place with respect to the back-flexing of movable vane sense of rotation, and make angle between bending direction and the running shaft greater than the movable vane established angle, holding back area and will wait upon and dwindle between movable vane and the straightening vane so, can postpone the phase place of the stator place pressure pulsation that above-mentioned interaction causes like this, thereby noise is descended.

If air separator outer wall and stator are made of resolution element, and: resolution element is some metal tubes that cut part segmental arc shell; Several resolution elements are to be circular layout between the sidewall of casing outer rim; Each resolution element connects as a whole by link; Certain part of air separator outer wall plays a part stator, and stator exists as a special independent component with regard to need not so, will make air separator be easier to processing like this.

If make the cross section of stator cyclic adapting piece wing, the exit flow of air separator will be by the main air flow direction that leads reposefully, therefore disturbance loss between air separator exit flow and main air flow will reduce, therefore, air separator had operating range expansion effect and pressurization will avoid weakened.

Be made of pipe and flat board if connect the link of stator or resolution element near the movable vane point, so this link with sword type cross section is processed than being easier to.

If the external diameter of air separator increases progressively along downstream direction, the flow perturbation in the air separator will be inhibited so, and operating range expansion effect that air separator had and pressurization also just avoid weakened.

Description of drawings

[Fig. 1] be propeller fan complete machine longitudinal section side view as described herein.

[Fig. 2] be the profile perspective of propeller fan air separator as described in the first embodiment of the present invention.

[Fig. 3] be the longitudinal section side view of propeller fan major component as described in the first embodiment of the present invention.

The sectional view that [Fig. 4] done along Fig. 3 IV-IV line.

The sectional view that [Fig. 5] done along Fig. 3 V-V line.

The radial velocity pulsatile change curve of [Fig. 6] impeller outlet air-flow.

[Fig. 7] as described in the first embodiment of the present invention noise with respect to the change curve of flow.

[Fig. 8] be the longitudinal section side view of propeller fan major component as described in the second embodiment of the present invention.

[Fig. 9] noise is with respect to the change curve of a certain ratio, and this ratio is that the stator inner edge is to the ratio of movable vane blade tip distance with respect to the movable vane height.

[Figure 10] pressure coefficient as described in the third embodiment of the present invention changes.

[Figure 11] be the longitudinal section side view of propeller fan major component as described in the fourth embodiment of the present invention.

The change curve of [Figure 12] movable vane blade face pressure distribution.

Relation curve between [Figure 13] noise and the dynamic and static blade gap distance.

[Figure 14] be the longitudinal section side view of propeller fan major component as described in the fifth embodiment of the present invention.

[Figure 15] be the longitudinal section side view of propeller fan major component as described in the seventh embodiment of the present invention.

[Figure 16] is to the 7th embodiment's propeller fan shown in Figure 15 diagram that its movable vane angle changes under the low discharge operating conditions.

[Figure 17] be the longitudinal section side view of propeller fan major component as described in the eighth embodiment of the present invention.

[Figure 18] is as the horizontal section plan view of propeller fan air separator part as described in the eleventh embodiment of the invention.

[Figure 19] is as the longitudinal section side view of propeller fan main portion as described in the twelveth embodiment of the invention.

[Figure 20] is as the profile perspective of propeller fan air separator part as described in the thriteenth embodiment of the invention.

[Figure 21] is as the upstream extremity sectional view of propeller fan air separator (shown in Figure 20) as described in the thriteenth embodiment of the invention.

[Figure 22] is as the longitudinal section side view of propeller fan major component as described in the fourteenth embodiment of the invention.

[Figure 23] is as the longitudinal section side view of propeller fan major component as described in the fifteenth embodiment of the invention.

[Figure 24] is as the longitudinal section side view of propeller fan major component as described in the sixteenth embodiment of the invention.

[Figure 25] is as the longitudinal section side view of propeller fan major component as described in the seventeenth embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing embodiments of the invention are described.

Fig. 1 is the complete machine profile diagram of propeller fan as described herein, and Fig. 2 is the profile perspective of propeller fan air separator part as described in the first embodiment of the present invention.Fig. 3 is that Fig. 4 is the sectional view of being done along Fig. 3 IV-IV line as the longitudinal section side view of propeller fan major component as described in first embodiment, and Fig. 5 is the sectional view of being done along Fig. 3 V-V line.

Among Fig. 1,1 expression movable vane, the casing of 2 expression movable vane peripheries, 5 expression air separators, 11 expression stator blades, 12 expression inner casings, 13 expression suction covers, 14 expression diffusion tubes, 15a to 15e represents mounting bracket.Movable vane 1 rotates by being contained in inner casing inside or outside motor driving, and inhaled air is pressurized and enters in the diffusion tube 14 from suction cover 13.The effect of air separator 5 is to prevent from back draught to occur on movable vane 1 blade tip.

Among Fig. 2, air separator 5 is made of the outer wall 3 of casing 2 (around movable vane 1) and sidewall 4, and each stator 16 is set in the air flow path 6 of air separator 5 and by near the link 19 movable vane 1 blade tip and couples together.As shown in Figure 3, contain on the air separator as the open part 6a of its air flow path 6 suction ports with as the air flow path air outlet and be positioned at another open part 6b of movable vane 1 inlet side upstream.And for example Fig. 3 shows, stator 16 extends to 6b place as the air outlet from the open part 6a as suction port.In addition, as shown in Figure 4 and Figure 5, air inlet parts 6a place at air separator 5 air flow paths 6, stator 16 have one with the reverse bending angle of movable vane 1 sense of rotation, simultaneously, as shown in Figure 5, each stator is along circumferentially arranging by suitable spacing, like this, air-flow 8a (participating in the circulation in air separator 5 air flow paths 6) and the rotation component velocity of air-flow 8c (sensing air outlet) just are eliminated, thereby have formed the axial flow behind the water conservancy diversion.

By movable vane 1 to the velocity fluctuation of the air-flow 8a of air separator 5 is one of generating noise source, and Fig. 6 has represented that the airspeed between a point and b point changes among Fig. 3.By the formed pressure pulsation of movable vane 1 ambient gas pressure field is that another noise produces the source, and its feature and situation shown in Figure 6 are similar.

In the first embodiment of the present invention, stator 16 is that the suction port 6a from air flow path 6 extends to 6b place, air outlet, and simultaneously, the 16b that is positioned at stator 16 inner edges at suction port 6a place is set at the position of comparing more close casing 2 outer radius with casing 2 inner radius.So just, strengthen the effect of eliminating air-flow 8c rotation component velocity, also can not weaken the effect of expansion operating range and the pressurization of air separator simultaneously.In addition, owing to be increased in the spacing of movable vane 1 and 16 settings of stator for reducing speed and pressure pulsation, and the pressure pulsation that stator 16 inner edge 16b places produce also is reduced, and the magnitude of the noise that is produced during operation in range of flow allowable therefore shown in Figure 7 just is lowered.The benchmark that it is noted that noise incremental quantity curve shown in Figure 7 is the noise level that the conventional air separator is produced when working under the design discharge condition.

Fig. 8 is the longitudinal section side view of propeller fan major component as described in the second embodiment of the present invention.In the embodiment shown in fig. 8, stator 7 only appears at the suction port 6a place of air separator 5, and stator 7 inner edge 7a are set at the position of comparing more close casing 2 outer radius with casing 2 inner radius.Therefore, compare with embodiment illustrated in fig. 1, although weakened to the elimination effect of air-flow 8c rotation component velocity, noise reduction still can reach the degree identical with first embodiment.

Noise was with respect to the variation tendency of ratio d/H due to Fig. 9 represented to pulse, ratio d/H be between stator 16 inner edge 16a and movable vane 1 blade tip apart from the ratio of d with respect to the movable vane height H.Due to noise be with the dimensionless form, and be that benchmark is shown out with the level of noise due to the conventional air separator.As seen from Figure 9, noise reduction changes very little after the d/H value surpasses 0.07.And for example shown in Figure 10, the d/H value less than 0.13 condition under, operating range expansion effect and pressurization can not weaken.Yet when the d/H value greater than 0.13 the time, the movable vane tip clearance will be excessive, thereby make stator 16 its functions of forfeiture, at this moment, shown in Figure 10 dotted line, operating range expansion effect and pressurization will weaken.

The 3rd embodiment has utilized the curve characteristic among Fig. 9 and Figure 10, is set between 0.07 to 0.13 apart from the d (between stator 16 inner edge 16a and movable vane 1 blade tip) and the ratio d/H of movable vane 1 height H.This processing has obtained and similar effects embodiment illustrated in fig. 1: realized the noise reduction purpose on the one hand under the condition that keeps operating range expansion effect, also do not weakened pressurization on the other hand.

If adopt the treatment measures that are similar to the 3rd embodiment in the embodiment shown in fig. 8, also soon be arranged between 0.07 to 0.13 apart from the d (between stator 16 inner edge 16a and movable vane 1 blade tip) and the ratio d/H of movable vane 1 height H, noise reduction still can reach the suitable level with former second embodiment so, simultaneously, operating range expansion effect and pressurization can be not weakened yet.

Figure 11 is the longitudinal section side view of propeller fan major component as described in the fourth embodiment of the present invention.Figure 12 has represented the feature of movable vane blade face pressure distribution.By stator 16 inner edge 16b respectively and the noise that interaction produced between air-flow 8a and movable vane 1 ambient pressure field depend on pressure difference Δ P between movable vane pressure surface shown in Figure 12 and back pressure face.

The 4th embodiment has revised spacing d (being inner edge passing amount) between movable vane 1 and the stator 16 inner edge 16b according to the ratio of power difference Δ P, as shown in figure 11.Like this, the speed and the pressure pulsation that produce with movable vane 1 rotation will be slowed down effectively, and simultaneously, the noise of being done to produce by the interaction of stator 16 inner edges 16 also can be lowered.

Figure 13 is the relation curve of noise and dynamic and static blade gap distance, and this curve draws from mechanics communique " about the research branch report of machine noise mechanism of production and Design of Low Noise practice " (1992 phase).From curve characteristic shown in Figure 13, some/one who had both made dynamic and static blade gap distance account for movable vane 1 chord length C, the noise that is produced still can be lowered to half not as good as dynamic and static blade gap distance noise more in short-term.Interaction between the interaction between air-flow and stator and movable vane ambient pressure field and stator all can produce noise, and the interaction between movable vane exit flow and stator blade also can produce noise, and the mechanism of noise generation of said two devices is considered to identical.Therefore, the relation curve of noise shown in Figure 13 and dynamic and static blade gap distance is used to be provided with the spacing d between movable vane 1 blade tip shown in Figure 11 and the stator 16 inner edge 16b maximum inner diameter positions, and like this, noise reduction just can reach the level identical with the 4th embodiment.

The some branches that account for movable vane 1 chord length C at dynamic and static blade gap distance for the moment, noise can be brought down below the level of half, therefore, reducing noise is not condition to increase spacing d (between movable vane 1 blade tip and the stator 16 inner edge 16b), and the elimination that also can not sacrifice 16 pairs of air-flow 8c rotations of stator component velocity act as cost.

In addition, under the prerequisite of utilizing Fig. 9 and relation curve shown in Figure 10, ((and the ratio d/H of movable vane 1 height H is arranged between 0.07 to 0.13, so just can reduce noise when keeping pressurization between the maximum inner diameter position of movable vane 1 blade tip and stator 16 inner edge 16b if with spacing d.

In the 4th embodiment shown in Figure 11, the stator inner edge be shaped as arc, if the inner edge maximum position roughly is distributed in a certain passing through mutually on the straight line, then noise still can be lowered.Equally, if inner edge is a stepped shape, and the step top is the inner edge summit, then still can obtain same effect.

Figure 14 is the longitudinal section side view of propeller fan major component as described in the fifth embodiment of the present invention.In this embodiment, the passing amount of stator 16 inner edge 16c (being positioned at the suction port place of air separator 5 air flow paths 6) along the downstream one side direction and increasing gradually.This processing can increase the distance between movable vane 1 and stator 16 inner edge 16c, thereby slowed down between air-flow 8a and the stator 16 and movable vane 1 ambient pressure field and stator 16 between interaction, in addition, compare with the 4th embodiment, the processing of stator 16 is also more simple.In addition, near movable vane 1 leading edge in the 5th example structure, distance between movable vane 1 blade tip and the straightening vane 16 inner edge 16c is very little, although this set can weaken the noise reduction at movable vane 1 leading edge place to a certain extent, but it obviously is better than first to the 3rd embodiment to the elimination effect of air-flow 8a rotation component velocity, therefore, the weakening trend of operating range expansion effect and pressurization also can further be alleviated.

Equally, as the 6th embodiment, if, when keeping pressurization, also can realize the noise reduction purpose so will being arranged between 0.07 to 0.13 apart from the ratio d/H of d (between movable vane 1 blade tip and the stator 16 inner edge 16b maximum inner diameter positions) and movable vane 1 height on the 5th embodiment basis.

Stator inner edge among the 5th embodiment shown in Figure 14 is a straight line type, if but arc or stepped shape that this inner edge increases progressively along downstream direction for height, then the noise reduction that is obtained is identical.

Figure 15 is the longitudinal section side view of movable vane and air separator part in the inclination changing blade axial-flow fan as described in the seventh embodiment of the present invention.When inclination changing blade axial-flow fan moves under the low discharge state (as shown in figure 16), reduce for avoiding efficient, the movable vane angle should change to solid line position by dotted line position from figure, that is must regulate the movable vane angle to obtain corresponding airflow direction 17.At this moment, as shown in figure 15, the axial length of movable vane has dwindled to the solid line variation with dotted line among the figure.

In the 7th embodiment, not relative with movable vane 1 blade tip part is positioned under the low discharge operating conditions and compares the position nearer apart from the casing outer radius with the casing inner radius on the stator 16 inner edge 16d.Correspondingly, the part that stator 16 inner edge 16d are upward relative with movable vane 1 upstream extremity edge (i.e. dotted line 1a among the figure) just is positioned at the casing inner radius under big flow operating conditions compares the position nearer apart from the casing outer radius, can slow down the interaction of 16 of 16 of air-flow 8a and stators and movable vane 1 ambient pressure field and stators like this.In addition, (among the figure shown in the solid line) upstream portion and stator 16 inner edge 16d are close to each other because the movable vane 1 under the low flow condition, therefore the elimination effect of 16 pairs of air-flow 8a rotations of stator component velocity still can be kept, and like this, the operating range expansion effect that air separator 5 is had will can be not weakened.

Equally, in the 8th embodiment, shown in Figure 15ly be set between 0.07 to 0.13 apart from the d (between movable vane 1 blade tip and the stator 16 inner edge 16b maximum inner diameter positions) and the ratio d/H of movable vane 1 height H.Like this, noise is reduced.

Figure 17 is the longitudinal section side view of inclination changing blade axial-flow fan major component as described in the ninth embodiment of the present invention.In the 9th embodiment, be positioned at the stator 16 at air separator 5 air flow paths 6 suction port 6a places inner edge 16e is pushed outwards and move, its passing amount is successively decreased along downstream direction.For the described propeller fan of the 9th embodiment, its noise reduction can (the movable vane angle is shown in 1a among the figure) be subjected to weakening to a certain degree under big flow operating conditions, what simultaneously it corrected air-flow rotation component velocity acts on that (the movable vane angle is shown in 1b among the figure) also can descend under the low discharge operating conditions, yet, under the middle amount operating conditions shown in Figure 17 solid line (between high flow capacity and low discharge), the interaction that interaction that air-flow 8a (pointing to movable vane 1) and stator are 16 and movable vane 1 ambient pressure field and stator are 16 is all comparatively gentle, thereby noise is also lower.In addition, compare with the 7th embodiment, the spacing of movable vane 1 blade tip and stator 16 inner edge 16e can be more recently under the intermediate flow operating conditions, like this, the elimination effect of the 16 couples of air-flow 8a of stator rotation component velocity is just kept, so the operating range expansion effect that air separator had will can be not weakened.

Equally, in the tenth embodiment, serve as that the basis is arranged between 0.07 to 0.13 apart from the d (between the maximum inner diameter position of movable vane 1 blade tip and straightening vane 16 inner edge 16b) and the ratio d/H of movable vane 1 height H shown in Figure 17 with the 8th embodiment.This processing makes pressurization kept under big flow condition, and noise has also been reduced.

Figure 18 is the horizontal section plan view as propeller fan air separator part as described in the eleventh embodiment of the invention.In the 11 embodiment, the stator 16 at air separator 5 suction port places is along movable vane 1 blade sense of rotation back-flexing, and the angle α between bending direction and the running shaft is greater than blade angle β.

In stator angle 16 during greater than the movable vane established angle, stator 16 is held back the zone and will be reduced along axial flow direction air separator 5 air flow paths 6 air inlet parts, therefore, will on sense of rotation, be delayed by the interaction between the air-flow 8a air flow path of air separator 5 (point to) and the straightening vane 16 with by the phase place of the stator that interaction caused 16 pressure pulsations between movable vane 1 all pressure fields and the stator 16, and, even stator 16 inner edges are not set at the position of comparing more close outer radius with the casing inner radius, noise still can be lowered.

When the 11 embodiment is applied to inclination changing blade axial-flow fan, need stator 16 with air separator 5 suction port places along movable vane 1 sense of rotation back-flexing, and the angle between oppositely crooked and the running shaft should be greater than the design and installation angle of blade.Like this, the noise reduction mechanism under the big flow condition (this moment, noise problem was the most outstanding) still will work under the design discharge condition.

Figure 19 is the longitudinal section side view as propeller fan major component as described in the twelveth embodiment of the invention.The 12 embodiment introduces first embodiment's stator setting method in the 11 embodiment shown in Figure 180, even also stator 16 inner edges at air separator 5 air flow paths 6 suction port 6a places are set at the position of comparing more close casing outer radius with casing 2 inner radius.

So just, can slow down between air-flow 8a and the stator 16 and movable vane 1 ambient pressure field and stator 16 between interaction, the phase place of stator 16 places pressure pulsation also can postpone along sense of rotation, and the noise reduction purpose also can realize.

If in second to the tenth embodiment, adopt the 11 embodiment's shown in Figure 180 stator setting method, even also air divides the stator 16 at device 5 suction port places along the sense of rotation back-flexing, and make angle between bending direction and running shaft greater than blade angle, then still can resemble and noise is reduced the 12 embodiment.

Figure 20 is the profile perspective as propeller fan air separator part as described in the thriteenth embodiment of the invention.And Figure 21 is the view of vertical (radially) section upstream extremity of air separator shown in Figure 20.In the 13 embodiment, air separator 5 outer walls 3 and stator 5 are made of some resolution elements, these resolution elements are some metal tubes 18 that cut part segmental arc shell, several this resolution elements are along being circular layout between the sidewall 4 of casing 2 outer rims, they are connected as a whole by near the link movable vane 1 blade tip 19, thereby have formed the air separator main body.Similar with the various embodiments described above, the inner edge 18a at air flow path suction port place also has the passing amount.

In the said method, the outer wall 3 and the straightening vane 16 that constitute air separator 5 shown in Figure 20 are to be formed by same element (metal tube 18), and this method makes stator 16 become unnecessary, and the processing of air separator is also simple than first embodiment.In addition, because the part segmental arc of metal tube plays a part stator, and can make the rotation component velocity of the bending angle of stator with elimination air- flow 8a and 8c, therefore this structure also can be kept the operating range expansion effect that air separator 5 is had when playing the noise reduction effect, and this point is similar among first embodiment air separator 5 inner edge 18a of suction port place outward radials are passed the effect that is reached.

If in second to the tenth embodiment, adopt the 13 embodiment's way, that is: air separator 5 outer walls 3 and stator 5 are made of resolution element, this resolution element is made by the metal tube that cuts the segmental arc shell, and several resolution elements are along being circular layout between the sidewall 4 of casing 2 outer rims and being connected to a integral body as air separator 5, noise reduction just can reach the suitable level of the 13 embodiment so, and the operating range expansion effect that air separator had simultaneously still can be kept.

Figure 22 is the longitudinal section side view as propeller fan major component as described in the fourteenth embodiment of the invention.In the 14 embodiment, the link 20 that connects stator 16 shown in Figure 4 has aerofoil section.The inner edge at suction port place resembles has the passing amount the foregoing description.The wing cross section of link 20 is more steady to the water conservancy diversion of air separator 5 exit flow 8d, therefore, disturbance loss between air-flow 8d and the main air flow 9 will reduce, and like this, operating range expansion effect that air separator 5 is had and pressurization will can be not weakened.In addition, because inner edge 16a is set at the position of comparing with the casing internal diameter more near external diameter, so noise also can be lowered.

If in the second to the 13 embodiment, adopt the wing cross section link 20 among the 14 embodiment, the exit flow 8d of air separator 5 will be by water conservancy diversion reposefully so, disturbance loss between air-flow 8d and the main air flow 9 also can reduce, therefore, operating range expansion effect that air separator 5 is had and pressurization can be not weakened, and noise also can be lowered.

Figure 23 is the longitudinal section side view as propeller fan major component as described in the fifteenth embodiment of the invention.In the 15 embodiment, the link 21 that connects stator 16 has sword type cross section, and it is made of pipe 21a and dull and stereotyped 21b, and stator 16 inner edge 16a are pushed and move to beyond the casing outer radius.Therefore, it is lower to have link 21 difficulty of processing in sword type cross section.In addition, be similar to the 14 embodiment, the sword type cross section of link 21 also can be smaller to water conservancy diversion comparison smooth air 8d and the disturbance loss between the main air flow 9 of air separator 5 exit flow 8d, therefore, the operating range expansion effect that had of air separator 5 and pressurization will can be not weakened.In addition, owing to inner edge 16a is set at beyond the casing outer radius, so noise is also lower.

If adopt the 14 embodiment's way in the first to the 13 embodiment, that is manufacture the link 20 of stator 16 or resolution element 18 with pipe 21a shown in Figure 23 and dull and stereotyped 21b, the manufacture difficulty of air separator will reduce so.

Figure 24 is the longitudinal section side view as propeller fan major component as described in the sixteenth embodiment of the invention.When the air-flow of 8a to 8c in air separator 5 air flow paths from the suction port 6a of air separator when air outlet 6b flows, its rotation component velocity is just eliminated by stator 16.In case occur disturbance in the air flow path 6 of air separator 5 and then produce loss, the operating range expansion effect that air separator had will weaken.

In sixteenth embodiment of the invention, the sectional area of air separator 5 air flow paths 6 successively decreases along updrift side.This set can make the acceleration of the air-flow 8c from suction port 6a to air outlet 6b in air separator 5 air flow paths 6, thereby suppressed the disturbance of appearance in air separator 5 air flow paths 6, therefore, therefore the operating range expansion effect that air separator had just can not weaken.

Figure 25 is the longitudinal section side view as propeller fan major component as described in the seventeenth embodiment of the invention.The 17 embodiment is above-mentioned first and 16 embodiments' combination, that is the stator 16 inner edge 16a at air separator 5 air flow paths 6 suction port 6a places are set at the position beyond casing 2 inner radius.This processing can slow down between air-flow 8a and stator and the interaction of 16 of movable vane ambient pressure field and stators, can also suppress the disturbance that air-flow 8c takes place in the air separator 5.Therefore, except the operating range expansion effect that air separator 5 is had was not weakened, noise also can be lowered.

If the 17 embodiment combines second to the tenth embodiment and the 16 embodiment like that, just noise reduction can realize so, and the operating range expansion effect that air separator 5 is had can not weaken yet.

Although above description to the present invention the first to the 17 embodiment is at axial flow or inclination changing blade axial-flow formula ventilator, but air separator can be transplanted in the fluid turbomachinery of centrifugal or diagonal flow type as described in the present invention, this transplanting can reduce noise, and can not weaken operating range expansion effect and pressurization.

In the propeller fan that contains air separator as described herein, stator in the air separator extends to the place, air outlet from the air separator suction port, and operating range expansion effect and pressurization that air separator is had avoid weakening.In addition, the outer path position of more close casing is compared in the position of suction port place stator inner edge with the casing inner diameter location, will slow down the interaction between air-flow in the air separator (from movable vane) and the stator like this, also can slow down the pressure field that forms around the movable vane and the interaction between the stator, thereby noise can be lowered also.

In addition, in the propeller fan that contains air separator as described herein, air separator outer wall and stator also can be made of resolution element, this resolution element is the metal tube that cuts part segmental arc shell, each resolution element is connected to an integral body and to be circular layout at casing outer rim place, this processing can make stator form and movable vane sense of rotation opposite curvature direction, thereby plays the effect of eliminating air-flow rotation component velocity, in addition, this processing also makes air separator be easier to processing.

In the propeller fan that contains air separator as described herein, air separator also can be made the shape that its external diameter increases progressively along downstream direction, can suppress the disturbance that air-flow takes place in the air separator like this, therefore, operating range expansion effect that air separator had and pressurization can be not weakened.

Claims (4)

1. a propeller fan comprises: the air separator that forms by outer wall and sidewall in the outside of the casing that surrounds movable vane; Be arranged at a plurality of straightening vanes in the stream of this air separator; Relative with above-mentioned movable vane in above-mentioned stream, as the suction port of the inlet of above-mentioned air separator; Air outlet as the outlet of above-mentioned air separator is characterized in that,

Move back to external diameter one rear flank than the inner diameter location of said machine casing the position of inner edge that is positioned at the above-mentioned straightening vane of above-mentioned suction port, if the height of above-mentioned movable vane is that the inner edge of H, above-mentioned straightening vane and the distance between the above-mentioned movable vane blade tip are d, is between 0.07 to 0.13 by the represented above-mentioned amount that retreats amplitude of d/H then.

2. a propeller fan comprises: the air separator that forms by outer wall and sidewall in the outside of the casing that surrounds movable vane; Be arranged at a plurality of straightening vanes in the stream of this air separator; Relative with above-mentioned movable vane in above-mentioned stream, as the suction port of the inlet of above-mentioned air separator; Air outlet as the outlet of above-mentioned air separator is characterized in that,

Above-mentioned straightening vane only is arranged at above-mentioned suction port, move back to external diameter one rear flank than the inner diameter location of said machine casing the position of inner edge that is positioned at the above-mentioned straightening vane of above-mentioned suction port, if the height of above-mentioned movable vane is that the inner edge of H, above-mentioned straightening vane and the distance between the above-mentioned movable vane blade tip are d, is between 0.07 to 0.13 by the represented above-mentioned amount that retreats amplitude of d/H then.

3. according to the propeller fan of claim 1 or 2, it is characterized in that the passing amount of stator inner edge position increases progressively along downstream direction.

4. according to the propeller fan of claim 1 or 2, it is characterized in that the part that constitutes air separator air flow path suction port on the stator is along the back-flexing of movable vane sense of rotation, the angle between bending direction and the movable vane running shaft is greater than the movable vane established angle.

Images