CN1223360A - DC blower - Google Patents
DC blower Download PDFInfo
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- CN1223360A CN1223360A CN 98118773 CN98118773A CN1223360A CN 1223360 A CN1223360 A CN 1223360A CN 98118773 CN98118773 CN 98118773 CN 98118773 A CN98118773 A CN 98118773A CN 1223360 A CN1223360 A CN 1223360A
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- impeller
- blower
- volute casing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/422—Discharge tongues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
- F04D17/04—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal of transverse-flow type
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
Abstract
A cross-flow blower including a cross-flow impeller is described. A stabilizer is provided with an opposed surface which is opposite to the front of a cross-flow impeller and has the beginning point formed by a point of intersection of a circular arc having the center located at the center of rotation of the cross-flow impeller and a diameter being 103% or more of the one of the cross-flow impeller and an extension of the inner surface of the trunk air duct and the end point formed in the direction outside the trunk air duct. Besides, a space between the inflow-side end part of the casing and the outer periphery of the cross-flow impeller is set to be 3% or more of the diameter of the cross-flow impeller, while the inner curved surface of the scroll casing is formed by a circular arc being concentric with the center of the casing and having a radius equaling a space to the inflow-side end part therefrom.
Description
The present invention relates to the DC blower of equipment such as air-conditioner air-supply usefulness.
DC blower is used for the air-supply of equipment such as air-conditioner in the past, people to its in energy-conservation, as to be used for comfortableness quietization processing, the aspects such as improved efficiency that are used to improve the steady air current processing of air-supply characteristic improve.But because the checking of the theoretical property of the air-flow of not blowing in the method for designing of DC blower, the improvement of above-mentioned like this characteristic is by adopting tentative wrong mode to carry out to each device in the equipment such as air-conditioner.
As described in the flat 5-296479 document of TOHKEMY, existing DC impeller is provided with the back shell that constitutes rear portion, DC blower top side, and the rear nozzle that is provided with viscous flow portion along the direction identical with the rotating shaft of DC blower.Can eliminate race conditios such as adverse current by above-mentioned structure, reduce noise, raise the efficiency the improvement of aspect.
In addition, as described in the flat 7-305695 document of TOHKEMY, in relative DC impeller, with the front lower from DC impeller, the perpendicular position of straight line at the center by DC impeller is provided with stabilizer.In addition, carried out the improvement of following aspect, the optimal mode in position according to relative this stabilizer forms volute casing by two circular arcs, suppresses the reduction and the noise of exhaust air rate thus.
In above-mentioned existing DC blower, improvement, reduction noise, stable air-supply air-flow for implementation efficiency, do not change the suction side shape of DC impeller or the shape of exhaust portion, in addition not to controlling by the phenomenon of the air-flow that DC impeller produced itself.Therefore have following problems, promptly can not be to efficient, the improvement of internal is carried out in aspects such as noise properties, because the related device in the equipment such as air-conditioner is improved to try wrong mode repeatedly, productivity incurs loss like this.
The present invention proposes in order to overcome the problems referred to above, the objective of the invention is to obtain a kind of DC blower, and this DC blower improves wind pushing performance according to the phenomenon control by the air-flow itself that DC impeller produced.
DC blower as the 1st technical scheme of the present invention relates to following a kind of DC blower, and it realizes that by DC impeller it comprises to the blowing of air:
Blast pipe, it leads to the air that above-mentioned DC impeller blowed:
Stabilizer, it is arranged on the above-mentioned blast pipe according to the mode relative with the front of above-mentioned DC blower;
Volute casing, it is to be arranged at the back of above-mentioned DC impeller with above-mentioned blast pipe ways of connecting;
The aforementioned stable utensil has following curved surface, and this curved surface is to be formed by near its circular arc that is centered close to the pivot of above-mentioned DC impeller;
Above-mentioned curved surface be arranged near the following starting point and following terminal point between, this starting point is arranged at the extended line of above-mentioned blast pipe and the intersection point place between the above-mentioned circular arc, and above-mentioned terminal point is arranged at the some place at direction of rotation one side of DC impeller and above-mentioned starting point maintenance certain distance;
Spacing between above-mentioned curved surface and the above-mentioned DC impeller is more than 3% of radius of above-mentioned DC impeller;
The center of above-mentioned starting point, above-mentioned terminal point and above-mentioned DC impeller is provided with according to the perpendicular bisector of the straight line that connects above-mentioned starting point and the above-mentioned terminal point mode by above-mentioned center;
Above-mentioned volute casing comprises the negative camber that is formed by the shell circular arc;
Above-mentioned shell circular arc is following circular arc, this center of arc is arranged in the triangle inside that is formed centrally by above-mentioned starting point, above-mentioned terminal point and above-mentioned DC impeller, and the length of imaginary line that connects the end, inflow side of above-mentioned center of arc and above-mentioned volute casing is the radius of this circular arc;
The periphery intersection point that intersects to form between the periphery of above-mentioned imaginary line and above-mentioned DC impeller, and the spacing between the end, inflow side of above-mentioned volute casing is more than 3% of diameter of above-mentioned DC impeller.
DC blower as the 2nd technical scheme of the present invention, the curved surface of aforementioned stable device is to be formed by following circular arc, this center of arc is positioned at the pivot place of above-mentioned DC impeller, and the radius of this circular arc is more than 103% of diameter of above-mentioned DC impeller.
As the DC blower of the 3rd technical scheme of the present invention, the aforementioned stable device has convex surface near the starting point of above-mentioned curved surface.
As the DC blower of the 4th technical scheme of the present invention, the curved surface of aforementioned stable device is to form along the regulation imaginary circle that is the center of circle with the center of arc of above-mentioned volute casing.
As the DC blower of the 5th technical scheme of the present invention, the aforementioned stable device has convex surface near the starting point of above-mentioned curved surface.
DC blower as the 6th technical scheme of the present invention, radius at the negative camber of above-mentioned volute casing is represented with r, flow velocity at the eddy flow of the internal flow of above-mentioned DC impeller is represented with V θ, the speed index is represented with n, the occasion that the cyclic constant of stream is represented with Γ, according to the mode of speed index n, by following formula in the scope of 0.85≤n≤0.1
Vθ×r
n=Γ
Determine radius r.
DC blower as the 7th technical scheme of the present invention, the radius r of the negative camber of above-mentioned volute casing, in the course of action of above-mentioned DC impeller, set lessly in the bigger occasion of the pressure loss that the outside produced of DC blower, set greatlyyer in the less occasion of the above-mentioned pressure loss.
DC blower as the 8th technical scheme of the present invention, the radius r of the negative camber of above-mentioned volute casing, the bigger occasion of the suction pressure that device produced loss in the suction side that is arranged at above-mentioned DC impeller is set lessly, sets greatlyyer in the less occasion of above-mentioned suction pressure loss.
DC blower as the 9th technical scheme of the present invention, the radius r of the negative camber of above-mentioned volute casing is determined in the following manner, this mode is: itself and be illustrated in the relation that the no dimension of the fluid loss situation that DC blower inside produced counts between the ξ and represent that by following formula this formula is: r
∝1/ ξ.
Fig. 1 is the figure of expression the present invention the 1st embodiment, and this figure is vertical side view of section of the indoor set in the air-conditioner;
Fig. 2 is used for the enlarged drawing that the air stream to the DC blower of Fig. 1 illustrates;
Fig. 3 is used for mode with hypothesis to the air stream figure that illustrate, suitable with Fig. 2 of Fig. 2;
Fig. 4 is another situation figure that describe, suitable with Fig. 2 that is used for the air stream of Fig. 3;
Fig. 5 is the figure that describe, suitable with Fig. 2 of a situation again that is used for the air stream of Fig. 3;
Fig. 6 is the also situation figure that describe, suitable with Fig. 2 that is used for the air stream of Fig. 3;
Fig. 7 is the another situation figure that describe, suitable with Fig. 2 that is used for the air stream of Fig. 3;
Fig. 8 is another situation figure that describe, suitable with Fig. 2 that is used for the air stream of Fig. 3;
Fig. 9 is the perspective view with the major part of the blade in the DC blower in the mode presentation graphs 1 that amplifies;
Figure 10 is the figure of expression the present invention the 2nd embodiment, and this figure is used for the air stream of DC blower is illustrated that it is equivalent to above-mentioned Fig. 2;
Figure 11 is and the corresponding figure of Figure 10 that this figure is used for another air stream of DC blower is illustrated that it is equivalent to above-mentioned Fig. 2;
Figure 12 is the figure of expression the present invention the 3rd embodiment, and this figure is used for the air stream of DC blower is illustrated that it is equivalent to above-mentioned Fig. 2;
Figure 13 is the figure of expression the present invention the 4th embodiment, and this figure is used for the air stream of DC blower is described with curve;
The figure that Figure 14 describes for the state to the air stream in blowing with the corresponding direct current of Figure 13, this figure is equivalent to Fig. 2;
Figure 15 is the figure of expression the present invention the 5th embodiment, and this figure is used for the air stream of DC blower is illustrated that it is equivalent to above-mentioned Fig. 2;
Figure 16 is vertical side view of section of the indoor set in the air-conditioner, and this figure is used for the shape of the volute casing of the DC blower of Figure 15 is described;
Figure 17 is vertical side view of section of the indoor set in the air-conditioner, and this figure is used for the another kind of shape of the volute casing of the DC blower of Figure 15 is described;
The 1st embodiment
An example in Fig. 1～9 expression embodiment of the invention, Fig. 1 is vertical side view of the indoor set in the air-conditioner, Fig. 2 is used for enlarged drawing that the air stream in the DC blower of Fig. 1 is illustrated, Fig. 3 illustrates the air stream among Fig. 2 for the mode with hypothesis, the figure suitable with Fig. 2, Fig. 4 is used for another situation of the air of Fig. 3 stream is described, the figure suitable with Fig. 2, Fig. 5 is used for a situation again of the air of Fig. 3 stream is described, the figure suitable with Fig. 2, Fig. 6 is used for an also situation of the air of Fig. 3 stream is described, the figure suitable with Fig. 2, Fig. 7 is used for the another situation of the air of Fig. 3 stream is described, the figure suitable with Fig. 2, Fig. 8 is used for another situation of the air of Fig. 3 stream is described, the figure suitable with Fig. 2, Fig. 9 are the perspective view with the major part of the blade in the DC blower in the mode presentation graphs 1 that amplifies.
In the accompanying drawings, the main body of label 1 expression indoor set, label 2 expressions are arranged at the plate of the front of main body 1, label 3 expressions are arranged on the plate 2, be formed with the grid of air introducing port, label 4 expression is arranged on the end face of main body 1, form the top suction inlet of the end face introducing port of air, the exhaust outlet that the bottom side of the close main body 1 of label 5 expressions is provided with previously, label 6 expressions are arranged at main body 1 inside, according to the heat exchanger that the mode relative with above-mentioned grid 3 is provided with, label 7 expressions are arranged at main body 1 inside, be oppositely arranged according to root edge portion with heat exchanger 6, admit the drip tray of the draining of heat exchanger 6.
In the DC blower that constitutes in the manner described above, when DC impeller 8 rotations, can be the line of demarcation with stabilizer 13, and produce following inlet flow and discharge currents, this inlet flow is through grid 3, top suction inlet 4 and by heat exchanger 6, above-mentioned discharge currents passes through the inside of DC impeller 8, and flows out towards blast pipe 10.And by inlet flow and discharge currents, form the orchid of correspondence position of stabilizer 13 that its center remains on the inside of DC impeller 8 in the following manner and agree combined vortex, this mode is: add blast pipe 10 in orchid shown in Figure 3 is agree the ideograph of combined vortex.
Above-mentioned orchid is agree combined vortex and forms free vortex flow 25 in the outside of forced vortex 24, and this free vortex flow 25 is by blast pipe 10 guiding, thereby the discharge currents of formation DC blower is promptly realized the air-supply function.Under these circumstances, when the leading section 27 of blast pipe 10 top underside 12 is positioned on the line of demarcation 26 of forced vortex 24 and free vortex flow 25, just obtains its efficient and reach the highest, further keep stable air-supply air-flow.
Fig. 4 and Fig. 5 are not positioned at the figure of the state of the fluid under the occasion on the line of demarcation 26 for the leading section 27 of top underside 12 of expression blast pipe 10, and Fig. 4 represents that leading section 27 is arranged at the occasion of the inside of free vortex flow 25, and discharge currents reduces under this state.Fig. 5 represents that leading section 27 is arranged at the occasion of the inside of forced vortex 24 in addition, produces loss because eddy current destroys under this state, and this wind efficient reduces like this.
The relation that orchid is agree between combined vortex and the stabilizer 13 describes below.Fig. 6 is the blue figure that agree the fundamental relation between combined vortex and the stabilizer 13 of expression, main stabilizer 28 realization following function, and soon blue free vortex flow 25 of agreeing in the combined vortex is separated into the inflow stream 30 towards eddy motion, and flows 31 from the outflow of eddy current.The separation of this free vortex flow 25 is that the pointed ends 29 by main stabilizer 28 realizes what eddy current separated.
In addition, because the different close pointed ends 29 of fluid of direction, promptly by the represented position of the broken circle among Fig. 6, the fluid of broken circle position is very unstable, and it is unstable that whole like this eddy current becomes.In addition, Fig. 7 refers in structure shown in Figure 6 for the state diagram of the stable fluid of the maintenance under the following occasion of expression, this occasion, adds the opposite face 18 that is positioned at stabilizer 13 places at pointed ends 29 places of main stabilizer 28.
Therefore, unsettled relatively fluid is provided with main stabilizer 28, and opposite face 18 is provided with according to the mode that flows the extension of 30 1 sides towards the inflow of eddy motion.Thus, because the effect of opposite face 18 just is separated into towards the inflow stream 30 of eddy motion with from the outflow of eddy current and flows 31.Therefore,, thereby make the fluid that is positioned at pointed ends 29 places keep stable, make whole fluid keep stable in addition because by the represented position of the broken circle among Fig. 7, direction not homogeneous turbulence produces separation mutually.
In addition, Fig. 8 refers in structure shown in Figure 6 that for the state diagram of the fluid of the following occasion of expression, this occasion at pointed ends 29 places of main stabilizer 28, the opposite face 18 that is positioned at stabilizer 13 places is to be provided with towards the mode that flows the extension of 3 one sides from the outflow of eddy current.At this moment, because from the effect of the outflow of eddy current stream 31, the side relative with DC impeller 8 in opposite face 18 produces new eddy current, can produce loss like this, thereby air-supply reduces.
Have again,, form by the shape of extending like this, then just obtain the fluid that its loss is less, high efficiency, maintenance is stable according to streamline along free vortex flow 25 because volute casing 9 is arranged at the inside that orchid is agree the free vortex flow 25 in the combined vortex.The streamline of above-mentioned free vortex flow 25 is and has the circular-arc of certain radius, is a circular-arc volute casing 9 that extends along the streamline of free vortex flow 25 by setting, just obtains the fluid that its loss is less, high efficiency, maintenance is stable.
According to mode described above, in the embodiment of Fig. 1～9, be provided with stabilizer 13, this stabilizer 13 has opposite face 18, this opposite face 18 forms in the following manner, this mode is: with the top underside 12 of following circular arc 15 with blast pipe 10, be that intersection point between the extended line of inner face of front one side of DC impeller 8 is as starting point 16, its lateral direction towards blast pipe 10 is extended and formation terminal point 17, this circular arc 15 is formed on the top underside 12 of blast pipe 10, the front of itself and DC impeller 8 is oppositely arranged, and its center is arranged at pivot 14 places of DC impeller 8, and its diameter is more than 103% of diameter of DC impeller 8.
In addition, be provided with the negative camber 19 of following volute casing 9, it is formed by the shell circular arc, in this shell circular arc, spacing from the periphery intersection point 23 between the periphery of following straight line 22 and DC impeller 8 to end, inflow side 20 is more than 3% of DC impeller 8 diameters, and this straight line 22 is connected between the end, inflow side 20 and volute casing center 21 of volute casing 9, in addition, the perpendicular bisector of the line of connection source 16 and terminal point 17 is arranged at pivot 14 places of DC impeller 8, the center of circle of above-mentioned shell circular arc coincides with the volute casing center 21 of the triangle inside that the pivot 14 that is provided with by above-mentioned starting point 16 and terminal point 17 and DC impeller 8 forms, and with the straight line that connects end, above-mentioned inflow side 20 and volute casing center 21 as radius.
Therefore,, can obtain the fluid that its loss is less, high efficiency, maintenance is stable, the air-supply function well by DC blower.In addition, by this air-supply effect, loss reduces, and the ratio of the rotary speed of air quantity and DC impeller 8 increases like this.Thus, owing to can reduce the rotary speed of the DC impeller 8 under the equal in quality, reduce thereby can make through the flow velocity w on the blade face that forms the blade 32 in the DC impeller 8 shown in Figure 9.Like this, can make mainly is that noise noise that cause, that blade 32 is produced by DC blower reduces, and can obtain the DC blower that turns round in quiet mode.
The 2nd embodiment
Figure 10 and Figure 11 are the key diagram of an example of other embodiments of the invention, this figure is used for the air stream of DC blower is illustrated, it is equivalent to above-mentioned Fig. 2, the figure of Figure 11 for another air stream in the DC blower is illustrated, and it is equivalent to above-mentioned Fig. 2.In addition, other structure among Figure 10 and Figure 11 is identical with the embodiment of above-mentioned Fig. 1～9, is made of DC blower.In the figure, identical with Fig. 1～9 label is represented corresponding part.
In the DC blower that forms in the manner described above, in the structure of Figure 10, there is not convex surface 36, direct current 34 flows into the top underside 12 of the angle of attack towards blast pipe 10.Thus, form stripping area 35 in stabilizer 13 1 sides, the fluid near produces bigger disorder herein.Therefore, form unsettled fluid, produce loss, produce bigger noise in addition.
In addition, in the structure of Figure 11, be formed with convex surface 36, do not form stripping area 35 so substantially, the disorder near is little herein.Thus, less from the loss of the outflow of eddy current stream.Therefore,, can obtain that its loss further reduces, high efficiency, stable fluid, bring into play good air-supply effect, can obtain the effect identical with the embodiment of above-mentioned Fig. 1～9 because direct current 34 keeps stable.
The 3rd embodiment
Figure 12 also is an instance graph of expression other embodiments of the invention, and this figure is used for the air stream of DC blower is illustrated that it is equivalent to above-mentioned Fig. 2.In addition, other structure of Figure 12 is identical with above-mentioned Fig. 1～9 embodiment's, is formed by DC blower.In the figure, the label identical with above-mentioned Fig. 1～9 represented corresponding part, label 37 expression outermost profile portion fluids, and it is formed at the outermost profile portion place on the blue line of demarcation 27 of agreeing forced vortex 24 in the combined vortex and free vortex flow 25.The opposite face of label 18 expression stabilizers 13, it is circular-arc along outermost profile portion fluid 37.
In the DC blower that forms according to mode, air stream near stabilizer 13 places is outermost profile portion fluid 37, the opposite face 18 of stabilizer 13 is circular-arc according to what extend along this outermost profile portion fluid 37, and promptly the circular-arc mode that overlaps with the center of circle of volute casing 9 forms.Thus, the loss of outermost profile portion fluid 37 reduces, and the loss of the forced vortex 24 of stabilizer 13 vicinity is less, thereby can obtain high efficiency, stable fluid, brings into play good air-supply effect, can obtain the effect identical with the embodiment of above-mentioned Fig. 1～9.
The 4th embodiment
Figure 13 and Figure 14 also are the key diagram of an example of other embodiments of the invention, the curve map that Figure 13 describes for the state to the stream of the air in the DC blower, Figure 14 is used for the state of the air stream of DC blower is described, and it is equivalent to above-mentioned Fig. 2.In addition, other structure of Figure 13 and Figure 14 is identical with the embodiment of above-mentioned Fig. 1～9, is formed by DC blower.
In the figure, the label identical with Fig. 1～9 represented corresponding part, and label 38 expressions are near the streamline of the air stream at negative camber 19 places of volute casing 9.In addition, the length of the end, inflow side 20 in the connection volute casing 9 and the straight line 22 at volute casing center 21, promptly the radius of the negative camber 19 of volute casing 9 is r.
In addition, the relational expression of the flow velocity in the flow field of volute casing 9 and radius r is as follows:
V θ * r
n=Γ ... formula (1)
Here, V θ: at the flow velocity of the eddy flow of DC impeller internal flow
N: speed index
Γ: the cyclic constant of fluid
In addition, according to above-mentioned formula (1), in 25 ones of the free vortex flows in the willing combined vortex of orchid, make curl from setting radius r in the mode of the scope of 0.85≤n≤0.1 on the occasion of the speed index n that is changed to negative value.In addition, Figure 13 agree the radius r of combined vortex and the curve map of the relation between peripheral compoent of velocity V θ, radius r and the curl ζ for expression is blue, this curl ζ generally can represent that according to following relational expression this relational expression is by the cyclic constant Γ and the speed index n of radius r, fluid:
ζ=F * (1-n) * r
-(1+n)Formula (2)
Have again, according to above-mentioned formula (2), under the situation of n＞1, curl ζ is a negative value, when the radius r with the negative camber 19 of volute casing 9 is set within this range, because as shown in figure 14, near negative camber 19 places,, have the reverse rotation eddy current for the eddy current that DC impeller 8 is produced, can cause bigger loss by convection cell like this, thereby cause efficient to reduce.
Under the situation of n＜1, curl ζ is that V θ is dull the reduction along with the increase of radius r on the occasion of, shown in Figure 13 as the front.Thus, set radius r, the loss of the fluid that the flow velocity in the volute casing 9 causes is reduced, thereby realize high efficiency by making speed index n 1 the mode of leveling off to as far as possible.Under the situation of n=1, curl ζ is 0 in addition, when the radius r with the negative camber 19 of volute casing 9 is set within this range, can form break-even fluid, thereby obtains the air-supply effect of extreme efficiency.
Have, the occasion of the actual use such as indoor set 1 grade in air-conditioner for the air that produced in DC blower stream, should be considered the change of the loss that produced, under the situation of n=1 and from n＜1 convergence 1, sets the radius r with suitable scope again.Thus, high efficiency, stable fluid can be obtained, good air-supply effect can be obtained.
In addition, in the embodiment of Figure 13 and Figure 14, the radius r that forms the negative camber 19 of volute casing 9 is set according to the mode of speed index n in the scope of 0.85≤n≤1.0.Thus,, can make the loss of fluid further be reduced to the limit like this, can obtain degree of stability and reach maximum, high efficiency fluid because negative camber 19 longshore current lines 38 extend.
Have, corresponding with the situation that loss that DC blower causes reduces, the air quantity in the DC impeller 8 and the ratio of rotary speed increase again.Therefore, because the rotary speed of DC impeller 8 under same air quantity can reduce, the flow velocity w that flows through from the blade face of the blade 32 that forms above-mentioned DC impeller 8 shown in Figure 9 reduces like this.Thus, can make mainly is that the noise of DC blower noise that cause, that blade 32 is produced reduces, can be at the DC blower that keeps turning round under the quiet situation thereby can obtain.
The 5th embodiment
Figure 15～17 also are an example of other embodiments of the invention, Figure 15 is used for the state of the air stream of DC blower is described, it is equivalent to above-mentioned Fig. 2, Figure 16 is the vertical side view of section that is used for the indoor set of the air-conditioner that the shape to volute casing describes, vertical side view of section of the indoor set in the air-conditioner that Figure 17 describes for other shape to volute casing.In addition, the embodiment's of other structure of Figure 15～17 and above-mentioned Fig. 1～9 is identical, is formed by DC blower.In the figure, the label identical with Fig. 1～9 represented corresponding part, and label 38 expressions are near the streamline of the air stream of the negative camber 19 of volute casing 9.
In addition, according to the radius r of the negative camber 19 of the volute casing among above-mentioned Figure 14 9, and the relation that the no dimension of the fluid loss degree that causes of the expression fluid that DC blower produced is counted between the ξ determines radius r by the mode that following formula 3 changes, and this formula 3 is:
r
∝1/ ξ ... formula 3
Thereby, the shape of setting volute casing 9.The i.e. bigger occasion of fluid loss that causes for the air-flow of DC blower, the radius r of the negative camber 19 of volute casing 9 reduces, and in addition in the less occasion of above-mentioned loss, the radius r of the negative camber 19 of volute casing 9 increases.
In addition, above-mentioned Figure 14 represents the fluid that is produced by DC blower and fluid under the bigger occasion of the fluid loss that causes, and Figure 15 represents the fluid under the less occasion of above-mentioned fluid loss in addition.Also have, 25 ones of the free vortex flows in volute casing 9 are located, curl ζ=0, and promptly the streamline 38 of speed index n=1 forms according to Figure 14 and mode shown in Figure 15.
In addition, the distance between eddy current center and streamline 38, when the radius that promptly forms streamline 38 was r ζ 0, in the bigger occasion of fluid loss, above-mentioned radius r ζ 0 reduced.Thus, in negative camber 19 vicinity of volute casing 9, its curl ζ is a negative value, and the eddy current owing to existing reverse rotation herein can cause damage like this, thereby efficient is reduced.
For fear of such rough sledding,, the radius of the negative camber 19 that forms volute casing 9 is reduced in the bigger occasion of fluid loss.In addition, in the less occasion of fluid loss, above-mentioned radius r ζ 0 increases, and is increasing near negative camber 19 place's flow velocitys, and consequent loss increases, thereby causes efficient to reduce.For fear of such rough sledding,, the radius r of the negative camber 19 that forms volute casing 9 is increased in the less occasion of fluid loss.
In addition, the occasion of the actual use such as indoor set 1 grade in air-conditioner, the air stream for DC blower produced can produce the pressure loss in above-mentioned grid 3, top suction inlet 4 and heat exchanger 6.In order to prevent this pressure loss, form the negative camber 19 of volute casing 9 according to following described mode.
That is, in the occasion that the thickness of heat exchanger 6 increases, shown in the dotted line among Figure 16, the radius r that forms negative camber 19 reduces.The occasion that reduces at the thickness of heat exchanger 6 in addition, shown in the dotted line among Figure 17, the radius r that forms negative camber 19 increases.Thus, can obtain fluid high efficiency, that maintenance is stable, noise is reduced, can obtain the DC blower that can under quiet situation, turn round.
According to top description, the present invention is provided with DC impeller, arranges in the back of this impeller Volute casing is arranged, blast pipe, this blast pipe is according to the mode that is connected with above-mentioned volute casing maintenance Arrange; Stabilizer, this stabilizer is formed on the above-mentioned blast pipe, and according to DC impeller The relative mode in front arranges, and it has opposite face, and this opposite face is to consist of in the following manner , this mode is: to be positioned at DC impeller front one side in following circular arc and the above-mentioned blast pipe The extended line of inner face between intersection point be starting point, prolong and form towards the lateral direction of blast pipe Terminal point, and the pivot place that is centered close to DC impeller of this circular arc, its diameter is the direct current leaf More than 103% of diameter of wheel; The negative camber of volute casing, it is formed by following shell circular arc, In this shell circular arc, from the periphery intersection point between the periphery of following straight line and DC impeller to stream The spacing that enters the side end place is more than 3% of diameter of DC impeller, and this straight line is connected in volute Between the end, inflow side and volute casing center of shell, the other straight line between starting point and the terminal point Perpendicular bisector be arranged at the pivot place of DC impeller, the center of circle of above-mentioned shell circular arc with The triangle inside that setting is formed by the pivot of above-mentioned starting point and terminal point and DC impeller The volute casing center coincides, and to connect end, above-mentioned inflow side and volute casing center Straight line is as radius.
Therefore, can obtain following effect, the air stream that namely produces for DC blower, whole The loss of individual fluid reduces, and can obtain fluid high efficiency, that maintenance is stable, obtains good The air-supply effect. In addition, the noise of DC blower is reduced, make the running environment keep quiet.
In addition, according to above-described mode, the starting point of the opposite face of the present invention in stabilizer The place is provided with convex surface.
Therefore, can obtain following effect, the air stream that namely produces for DC blower, base This does not form the stripping area that is positioned at stabilizer one side, the damage that particularly flows from the outflow of eddy current Mistake reduces. Thus, can obtain fluid high efficiency, that maintenance is stable, obtain good air-supply Effect. In addition, the noise of DC blower is reduced, make the running environment keep quiet.
In addition, according to above-described mode, the present invention is formed with stabilizer along following circle Opposite face, this circle is take the volute casing center as the center of circle.
Therefore, the air stream that produces for DC blower is particularly near the stabilizer place The loss that forced vortex causes reduces. Thus, can obtain following effect, namely obtain high efficiency, Keep stationary flow, obtain good air-supply effect. Has in addition the noise that can make DC blower Reduce, make the running environment keep quiet effect.
Also have, in DC blower of the present invention, the starting point place shape of the opposite face of stabilizer Become convex surface, the opposite face of stabilizer forms along the circle take the volute casing center as the center of circle.
Therefore, the air stream for DC blower produces does not form stabilizer one side substantially Stripping area, the particularly loss from the outflow of eddy current stream reduce. In addition, especially close The loss of the forced vortex at stabilizer place reduces. Thus, have following effect, namely obtain higher Efficient, keep stable fluid, obtain good air-supply effect. In addition, have can make straight The noise of stream air blast reduces, and makes the running environment keep quiet effect.
In addition, according to above-described mode, in the present invention, when the radius that represents the negative camber of volute casing with r, V θ represents to flow through the flow velocity of the eddy flow of DC impeller inside, and n represents the speed index, when Γ represents the cyclic constant of fluid, then
Vθ×r
n=Γ
In the formula, by the mode of speed index n in the scope of 0.85≤n≤0.1 come Set the radius r of the negative camber of volute casing.
Therefore, can make along the fluid loss of the streamline of the DC blower of the negative camber of volute casing Be reduced to the limit, obtain degree of stability and reach maximum, high efficiency fluid. Thus, Have can obtain more high efficiency, keep stable fluid, obtain good air-supply effect. In addition Outward, have the noise of DC blower is reduced, make the running environment keep quiet effect.
In addition, according to above-described mode, in the present invention, when the radius that represents the negative camber of volute casing with r, V θ represents to flow through the flow velocity of the eddy flow of DC impeller inside, and n represents the speed index, when Γ represents the cyclic constant of fluid, then
Vθ×r
n=Γ
In the formula, by the mode of speed index n in the scope of 0.85≤n≤0.1 come Set the radius r of the negative camber of volute casing, and the fluid that produces for DC impeller, straight The bigger occasion of the pressure loss of the outer fluid that produces of stream air blast, radius r reduces, above-mentioned The occasion that the pressure loss is littler, above-mentioned radius r is bigger.
Therefore, be positioned at the loss that the reverse rotation eddy current of the negative camber vicinity of volute casing causes Reduce, can reduce along the fluid loss of the DC blower air-supply streamline of the negative camber of volute casing To the limit, thereby obtain stable maximum, the high efficiency fluid that reaches. Thus, have Obtain fluid more high efficiency, that maintenance is stable, obtain the effect of good air-supply effect. In addition , have the reducing noise that can make DC blower outward, make the running environment keep quiet effect.
Have again, according to above-described mode, in the present invention, when the radius that represents the negative camber of volute casing with r, V θ represents to flow through the flow velocity of the eddy flow of DC impeller inside, and n represents the speed index, when Γ represents the cyclic constant of fluid, then
Vθ×r
n=Γ
In the formula, by the mode of speed index n in the scope of 0.85≤n≤0.1 come Set the radius r of the negative camber of volute casing, and for the fluid that DC impeller produces, establish The bigger occasion of the pressure loss that places the device of the suction side of DC impeller to cause, radius r subtracts Little, in the littler occasion of the above-mentioned pressure loss, above-mentioned radius r is bigger.
The pressure loss that therefore, can cause the device of the suction side that is arranged at DC impeller is made Reaction can make along the damage of the fluid of the air-supply streamline of the DC blower of the negative camber of volute casing Mistake is reduced to the limit, obtains degree of stability and reaches maximum, high efficiency fluid. Thus, have Obtain fluid more high efficiency, that maintenance is stable, obtain the effect of good air-supply effect. In addition , have the reducing noise that can make DC blower outward, make the running environment keep quiet effect.
In addition, according to above-described mode, in the present invention, when the radius that represents the negative camber of volute casing with r, V θ represents to flow through the flow velocity of the eddy flow of DC impeller inside, and n represents the speed index, when Γ represents the cyclic constant of fluid, then
Vθ×r
n=Γ
In the formula, by making the mode of speed index n in the scope of 0.85≤n≤0.1 set the radius r of the negative camber of volute casing.
R is except above-mentioned setting, for the fluid that DC impeller produced, the bigger occasion of the pressure loss of the outer fluid that is produced of DC blower, radius reduces, increase in the above-mentioned radius r of the less occasion of the above-mentioned pressure loss, and, count relation between the ξ with the no dimension of the fluid loss degree of expression fluid that relative DC blower produces, according to following formula with regard to the radius r of the negative camber of volute casing
r
∝1/ξ
Set radius r.
Therefore, DC impeller is arranged at the optimal position in the volute casing.Thus, the pressure loss of the outer fluid that is produced of DC blower reduces, and can be reduced to the limit along the fluid loss of the air-supply streamline of the DC blower of the negative camber of volute casing, obtains degree of stability and reaches maximum, high efficiency fluid.Thus, have can obtain high efficiency, keep stable fluid, obtain better air-supply effect.In addition, have the noise of DC blower is reduced, make the running environment keep quiet effect.
Claims (9)
1. DC blower, it realizes the blowing of air be is characterized in that it comprises by DC impeller:
Blast pipe, it leads to the air that above-mentioned DC impeller blowed:
Stabilizer, it is arranged on the above-mentioned blast pipe according to the mode relative with the front of above-mentioned DC blower;
Volute casing, it is to be arranged at the back of above-mentioned DC impeller with above-mentioned blast pipe ways of connecting;
The aforementioned stable utensil has following curved surface, and this curved surface is to be formed by near its circular arc that is centered close to the pivot of above-mentioned DC impeller;
Above-mentioned curved surface be arranged near the following starting point and following terminal point between, this starting point is arranged at the extended line of above-mentioned blast pipe and the intersection point place between the above-mentioned circular arc, and above-mentioned terminal point is arranged at the some place at direction of rotation one side of DC impeller and above-mentioned starting point maintenance certain distance;
Spacing between above-mentioned curved surface and the above-mentioned DC impeller is more than 3% of radius of above-mentioned DC impeller;
The center of above-mentioned starting point, above-mentioned terminal point and above-mentioned DC impeller is provided with according to the perpendicular bisector of the straight line that connects above-mentioned starting point and the above-mentioned terminal point mode by above-mentioned center;
Above-mentioned volute casing comprises the negative camber that is formed by the shell circular arc;
Above-mentioned shell circular arc is following circular arc, this center of arc is arranged in the triangle inside that is formed centrally by above-mentioned terminal point and above-mentioned DC impeller, and the length of imaginary line that connects the end, inflow side of above-mentioned center of arc and above-mentioned volute casing is the radius of this circular arc;
The periphery intersection point that intersects to form between the periphery of above-mentioned imaginary line and above-mentioned DC impeller, and the spacing between the end, inflow side of above-mentioned volute casing is more than 3% of diameter of above-mentioned DC impeller.
2. DC blower according to claim 1, the curved surface that it is characterized in that the aforementioned stable device is to be formed by following circular arc, this center of arc is positioned at the pivot place of above-mentioned DC impeller, and the radius of this circular arc is more than 103% of diameter of above-mentioned DC impeller.
3. DC blower according to claim 2 is characterized in that the aforementioned stable device has convex surface near the starting point of above-mentioned curved surface.
4. DC blower according to claim 1, the curved surface that it is characterized in that the aforementioned stable device are to form along the regulation imaginary circle that is the center of circle with the center of arc of above-mentioned volute casing.
5. DC blower according to claim 4 is characterized in that the aforementioned stable device has convex surface near the starting point of above-mentioned curved surface.
6. according to any one the described DC blower in the claim 1～5, it is characterized in that representing with r at the radius of the negative camber of above-mentioned volute casing, flow velocity at the eddy flow of the internal flow of above-mentioned DC impeller is represented with V θ, the speed index is represented with n, the occasion that the cyclic constant of stream is represented with Γ, according to the mode of speed index n, by following formula in the scope of 0.85≤n≤0.1
Vθ×r
n=Γ
Determine radius r.
7. DC blower according to claim 6, the radius r that it is characterized in that the negative camber of above-mentioned volute casing, in the course of action of above-mentioned DC impeller, set lessly in the bigger occasion of the pressure loss that the outside produced of DC blower, set greatlyyer in the less occasion of the above-mentioned pressure loss.
8. DC blower according to claim 7, the radius r that it is characterized in that the negative camber of above-mentioned volute casing, the bigger occasion of the suction pressure that device produced loss in the suction side that is arranged at above-mentioned DC impeller is set lessly, sets greatlyyer in the less occasion of above-mentioned suction pressure loss.
9. DC blower according to claim 7, the radius r that it is characterized in that the negative camber of above-mentioned volute casing, determine in the following manner, this mode is: itself and be illustrated in the relation that the no dimension of the damaed cordition of the stream that DC blower inside produced counts between the ξ and represent that by following formula this formula is: r
∝1/ ξ.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00360698A JP3649567B2 (en) | 1998-01-12 | 1998-01-12 | Once-through fan |
| JP3606/98 | 1998-01-12 | ||
| JP3606/1998 | 1998-01-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1223360A true CN1223360A (en) | 1999-07-21 |
| CN1115523C CN1115523C (en) | 2003-07-23 |
Family
ID=11562160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98118773 Expired - Fee Related CN1115523C (en) | 1998-01-12 | 1998-08-27 | DC blower |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0928899B1 (en) |
| JP (1) | JP3649567B2 (en) |
| CN (1) | CN1115523C (en) |
| DE (1) | DE69820976T2 (en) |
| ES (1) | ES2212179T3 (en) |
| HK (1) | HK1021656A1 (en) |
| TW (1) | TW360767B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462564C (en) * | 2005-10-28 | 2009-02-18 | 三菱电机株式会社 | Crossflow fan |
| CN1955564B (en) * | 2005-10-27 | 2010-05-05 | 乐金电子(天津)电器有限公司 | Indoor unit of split air conditioner |
| CN105849467A (en) * | 2013-12-27 | 2016-08-10 | 大金工业株式会社 | Indoor air conditioner |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3497073B2 (en) * | 1998-01-19 | 2004-02-16 | 三菱電機株式会社 | Once-through blower |
| AU767078B2 (en) | 2000-09-29 | 2003-10-30 | Mitsubishi Denki Kabushiki Kaisha | Air conditioner |
| ITVI20020145A1 (en) * | 2002-07-02 | 2004-01-02 | Comefri Spa | ANTI-NOISE AND ANTI-VORTE DIVIDER |
| DE502006005157D1 (en) | 2005-07-28 | 2009-12-03 | Ebm Papst St Georgen Gmbh & Co | heater |
| JP5029109B2 (en) * | 2007-04-12 | 2012-09-19 | パナソニック株式会社 | Air conditioner |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2934987A1 (en) * | 1979-08-30 | 1981-03-19 | Kurt Dr.-Ing. 7500 Karlsruhe Zenkner | Roof ventilator with centrifugal fan - has spiral plate and body for flat pressure-volume characteristic |
| DE8034229U1 (en) * | 1980-12-22 | 1986-07-03 | Ltg Lufttechnische Gmbh, 7000 Stuttgart | Tangential fan |
| FR2619422B1 (en) * | 1987-08-13 | 1989-12-08 | Onera (Off Nat Aerospatiale) | CROSS-CURRENT FAN |
| JPH05296479A (en) | 1992-04-17 | 1993-11-09 | Toshiba Corp | Indoor unit for air conditioning device |
| JP2642900B2 (en) | 1995-04-14 | 1997-08-20 | 三洋電機株式会社 | Air conditioner |
-
1998
- 1998-01-12 JP JP00360698A patent/JP3649567B2/en not_active Expired - Lifetime
- 1998-07-10 TW TW087111265A patent/TW360767B/en not_active IP Right Cessation
- 1998-07-31 EP EP19980114422 patent/EP0928899B1/en not_active Expired - Lifetime
- 1998-07-31 ES ES98114422T patent/ES2212179T3/en not_active Expired - Lifetime
- 1998-07-31 DE DE1998620976 patent/DE69820976T2/en not_active Expired - Lifetime
- 1998-08-27 CN CN 98118773 patent/CN1115523C/en not_active Expired - Fee Related
-
2000
- 2000-01-20 HK HK00100364A patent/HK1021656A1/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1955564B (en) * | 2005-10-27 | 2010-05-05 | 乐金电子(天津)电器有限公司 | Indoor unit of split air conditioner |
| CN100462564C (en) * | 2005-10-28 | 2009-02-18 | 三菱电机株式会社 | Crossflow fan |
| CN105849467A (en) * | 2013-12-27 | 2016-08-10 | 大金工业株式会社 | Indoor air conditioner |
| CN105849467B (en) * | 2013-12-27 | 2017-12-01 | 大金工业株式会社 | Indoor apparatus of air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11201487A (en) | 1999-07-30 |
| CN1115523C (en) | 2003-07-23 |
| DE69820976D1 (en) | 2004-02-12 |
| JP3649567B2 (en) | 2005-05-18 |
| DE69820976T2 (en) | 2004-10-21 |
| TW360767B (en) | 1999-06-11 |
| EP0928899A2 (en) | 1999-07-14 |
| EP0928899A3 (en) | 2000-05-03 |
| ES2212179T3 (en) | 2004-07-16 |
| EP0928899B1 (en) | 2004-01-07 |
| HK1021656A1 (en) | 2000-06-23 |
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