JPH09250493A - Cross flow fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-noise cross flow fan with its good sound quality capable of reducing rotational secondary sound helped by flow interference of the right and left of a vane holding plate part and the right and left interference sound (fluid sound) caused by right and left flow interference. SOLUTION: The mounting position and vane shape of a number of vanes 4 at the right and left of a vane holding plate 2 are substantially identical to each other, a shape in which advancing and retracting phases in the rotational direction are phase-varied alternately is formed in the longitudinal line at the outer diameter side end of a number of vanes 4 in the vane holding segment. The longitudinal line of e vane at the outer diameter side end comprises one or plural phase changes in order of advance-retract-advance or retract-advance- retract on the same vane, at the same time one or plural phase changes are constituted in order of large-small-large or small-large-small in the longitudinal direction at the vane position outer diameter, flow type and disturbance type are diverged, and uniformity of pressure variation is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross-flow fan, and relates to a cross-flow fan having a good sound quality and a large air volume, in which secondary sound of rotation and left-right interference noise in a blade holding plate are reduced. Used for machines, air curtains, etc.

[0002]

2. Description of the Related Art As a conventional cross-flow fan, for example, the one described in Japanese Utility Model Laid-Open No. 61-144294 as shown in FIG. 7 is known. FIG. 7 is a perspective view showing an example of a conventional cross-flow fan. The cross-flow fan shown in FIG. 7 has a configuration in which the radii of the multiple blades 10 from the rotation axis are changed in the longitudinal direction of the blades, but the configuration of the left and right blade positional relationships of the blade holding plate 11 is clearly disclosed. Was not done.

As another conventional cross-flow fan, the one described in Japanese Utility Model Publication No. 7-40718 is known. The cross-flow fan described in the publication has a large gradient so that the outer peripheral edge of the blade gradually sinks inward toward one end side in the longitudinal direction between the blade holding plates. The blades are provided so as not to be aligned in a straight line in the longitudinal direction of the fan shaft (rotational axis), and the blade position is rapidly changed in a radial direction in a fault-like manner.

[0004]

In this type of once-through fan, since the air volume is obtained in proportion to the lateral length in principle, the more the lateral length, the more the characteristics can be utilized. However, in order to make it horizontally long, it is necessary to provide many intermediate blade holding plates. There is essentially no flow in the blade holding plate, causing turbulence on the inflow side and wake vortices on the outflow side. However, if the position and shape of the blades are different on the left and right sides of the blade holding plate, the flow of the wind on the left and right is different, which causes interference by entraining the turbulent vortex in the direction with stronger flow and causing a whistle-like rotation. Secondary sound (rotational speed x frequency sound of total number of left and right blades) is increased, and at the same time turbulent sound (generally, rotational sound 2
The sound of a wide frequency band of 5000 Hz from the frequency near the next frequency, including a sound that feels shattered, hereinafter referred to as left-right interference sound)
There is a problem that the sound quality is deteriorated because the noise level is raised and the semi-continuous sound is generated.

The left-right interference sound is disturbed in the blade holding plate portion due to the speed difference between the left and right sides of the blade holding plate portion, and when flowing in, the weaker flow is attracted to the stronger flow, which is different from the blowing direction. This is because the flow is inclined, and when it flows out, the flow including the vane wake vortex of the weaker flow is entrained in the stronger flow and the turbulence becomes large. Also, the noise level greatly affects the strong flow.

Further, in the blade holding plate portion, the existence of the blade holding plate is obstructed, or the outer diameter of one of the left and right blade positions is reduced, so that the air volume of one of the blade holding plates is reduced. There was a problem. In addition, when the blade position outer diameter changes in one of the longitudinal directions between the blade holding plates, there is a problem that the outflow air amount and the direction are deviated.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and the object (problem) of the present invention is to enhance the rotational noise 2 promoted by the left and right flow interference of the blade holding plate portion.
Another object is to provide a low-noise once-through fan with good sound quality by reducing the left-right interference sound (fluid sound) caused by the left-right flow interference. In addition, the primary rotational noise (rotational speed × the number of blades in the rotational direction) generated in the blade holding section is reduced to reduce the promoting action of the secondary rotational sound, resulting in good sound quality, low noise, and a large air volume. To provide a once-through fan.

[0008]

In order to solve the above-mentioned problems, the most basic structure of the cross-flow fan according to the present invention is to provide a plurality of blade holding plates arranged at appropriate intervals in the longitudinal direction of the rotating shaft. In a cross-flow fan consisting of a large number of blades provided at intervals in the circumferential direction near the outer periphery of the blade holding plate, the mounting positions and blade shapes of the plurality of blades on the left and right of the blade holding plate are adjusted to be substantially the same. In the longitudinal line of the outer diameter side end of the plurality of blades between the blade holding plates,
The shape is such that a phase advancing in the rotational direction and a phase receding in the rotational direction are alternately changed. That is, according to the phase change in the rotation direction, the outer diameter of the blade position in the cross section perpendicular to the longitudinal direction has a large and small phase change in the longitudinal direction of the blade.

The shape of the phase change in the longitudinal line at the outer diameter side end of a large number of blades is formed one or more times in the order of forward and backward forward movement or backward and forward forward and backward movement in the rotational direction, and According to the phase change in the direction, the outer diameter of the blade position in the cross section perpendicular to the longitudinal direction is changed in the longitudinal direction of the blade one or more times in the order of large and small or small and large. Furthermore, in addition to making the phase change wavy, it is formed at intervals that are not standardized in the longitudinal direction of the rotation axis, and the phase change of the rotation direction and the blade position outer diameter is configured by the change in the dimension or shape of the blade cross section. is there.

In order to solve the above-mentioned problems, a more specific structure of the cross-flow fan according to the present invention has a plurality of blade holding plates arranged at appropriate intervals in the longitudinal direction of the rotating shaft, and a blade holding plate. In the cross-flow fan consisting of a large number of blades provided at intervals near the outer periphery of the blade, the plurality of blade holding plates are provided with grooves for a large number of blades around the rotation axis, and all blades Match the positions and shapes of the grooves of the many blades on the holding plate, insert many blades into the grooves, and arrange them so that they penetrate all the blade holding plates. The blades of the blades are fixed to form a horizontally long cage impeller, and a phase advancing in the rotational direction and a phase receding in the rotational direction are alternately arranged on the longitudinal lines of the outer diameter side ends of the plurality of blades between the blade holding plates. It is a shape that changes the phase.

Further, the phase change in the rotation direction is wavy, and the shape of the phase change in the longitudinal direction line of a large number of blades is formed once or a plurality of times in the rotation direction in the order of forward / backward forward or backward forward / backward. In addition, the outer diameter of the blade position in the cross section perpendicular to the longitudinal direction is formed in a phase change of large and small or small and large in the longitudinal direction of the blade, and the cross-sectional shape of the blade and the mounting position of the blade in all blade holding plate parts are set. It is almost the same.

For example, the form of the phase change in the rotation direction or the phase change in the blade position outer diameter is based on one end on the inner peripheral side in the width direction of the blade, and is a portion where the chord length is large in a cross section perpendicular to the longitudinal direction. Those with a large radius of curvature and a small radius of curvature in the part where the chord length is small, those with almost the same cross-sectional shape in the cross section perpendicular to the longitudinal direction, and those that are formed back and forth in the direction perpendicular to the chord, There is a blade formed by advancing or retracting the outer peripheral side of the other end in the rotational direction with one end on the inner peripheral side in the width direction of the blade as a reference.

Further, for example, one end of the blade in the width direction is made to be a straight line in the longitudinal direction, and the other end is changed in width in the longitudinal direction with reference to the one end, and a cross section perpendicular to the longitudinal direction is at least a part or all. Is a circular arc, and the cross-section of each part is formed so as to overlap the same cross-section line. In addition, the arc of the blade cross section closer to the outer circumference of the impeller has a larger arc length as the chord length increases to obtain a blade inclination direction suitable for inflow and outflow of wind. Further, the blade can be easily manufactured by inserting it from the radial direction as a metal material.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
It will be described with reference to FIGS. [Embodiment 1] FIG. 1 is a perspective view showing the shape of a main part of a cross-flow fan according to an embodiment of the present invention, and FIG. 2 is a sectional view of the main part of FIG. In FIG. 1, reference numeral 1 is a boss to which a drive shaft is attached. Reference numeral 2 denotes a blade holding plate arranged at appropriate intervals in the longitudinal direction of the rotating shaft. The blade holding plate 2 is made of metal, and is arranged in the longitudinal direction of the rotating shaft at short intervals near the boss and at the intermediate position. Multiple sheets are arranged at long intervals.

Each of the blade holding plates 2 is ring-shaped, and is provided with a number of blade grooves 3 in the circumferential direction from the outer peripheral side near the outer periphery around the rotation axis. The outer diameters of all of these blade holding plates 2 and the positions and shapes of the blade grooves 3 are made the same. Ring-shaped inner holes are closed at the boss 1 side and the other end (not shown) of the cross-flow fan by boss parts and shaft parts, respectively. The blade holding plate is not limited to the ring-shaped one and may be a disc.

Reference numeral 4 denotes a large number of metallic blades inserted into the blade grooves 3, and the blades 4 are configured to be inserted into the blade holding plate 2 from the radial direction and penetrate the blade holding plate 2. After that, the blade holding plate 2 is fixed by crushing the outer periphery of the blade holding plate 2 with a roller. In this way, the cross-flow fan is formed into a horizontally long cage impeller (hereinafter simply referred to as impeller) and completed.

The blade 4 will be described in more detail with reference to FIG. In the blade 4, the lower end 4sa of the blade cross section located on the inner peripheral side of the impeller is linear in the longitudinal direction (axial direction). The upper ends 4a of the blades located between the blade holding plates, that is, on the outer peripheral side of the impeller in the blade cross section in the blade holding section,
4b changes the width of the blade cross section, that is, the chord lengths Ca and Cb with reference to the lower end 4sa of the blade. Then, in the first blade holding section L _{1 having} a narrow interval near the boss 1, the size is changed in a wave shape in the longitudinal direction from large to small (chord length Ca, Cb, Ca),
In the next second blade holding section L _{2 with} a wide interval, the large-sized large-small-sized (chord length Ca, Cb, Ca, C
(b, Ca) and the shape is repeated twice.

As shown in FIG. 1, the blade holding section L ₁ ,
At the beginning and the end of L ₂ , L _3, ..., The blade cross section has a structure starting from large and ending at large. The interval between the large chord length Ca of the blade 4 (section A in FIG. 1) and the small chord length Cb (section B in FIG. 1), that is, the intervals l ₁ , l ₂ , and l ₃ shown in FIG. ... are non-standardized intervals.

FIG. 2 typically shows two places, a large chord length portion A (chord length Ca) and a small chord portion B (chord length Cb, indicated by hunting) of a cross section perpendicular to the longitudinal direction of the blade 4. It is shown. The outer diameter at which the blade is located in a cross section perpendicular to the longitudinal direction of the rotation axis is referred to as the blade position outer diameter in this specification.
The dashed-dotted line Da is the envelope of the portion where the blade position outer diameter is large, the dashed-dotted line Db is the envelope of the portion where the blade position outer diameter is small, and the dashed-dotted line Ds is the envelope of the blade position inner diameter.

At least a part of the blade 4 has a circular arc or the whole of the blade has a circular arc, and the cross sections of the respective portions are formed so as to overlap with the same cross sectional line when viewed in the longitudinal direction. Further, the arc radius Ra of the cross section A, which is a portion having a longer chord length than the cross section B and protruding outward, is formed larger than the arc radius Rb of the cross section B. The dimensional shape of each cross section of the portion corresponding to the blade holding plate 2 is exactly the same (cross section A in the present embodiment shown in FIG. 1).

The impeller using the blade 4 is horizontally long,
By simply mounting the blade 4 in parallel with the axis, the longitudinal line of the outer diameter side end of the blade holding section of the blade moves to the position of advancing in the rotation direction N in the portion A where the chord length is large, and the chord length is small. In the portion B, the position is set back in the rotation direction N. That is, the configuration is such that the phase is changed once or a plurality of times in a wavy manner in the order of forward / backward forward or backward / forward / backward.
Further, in accordance with the phase change in the rotation direction N, the outer diameter of the blade position becomes large (Da) in the advancing portion and small (Db) in the retreating portion, and once in the order of large and small or small and large in the longitudinal direction. Alternatively, it is a once-through fan having a structure in which the phase is changed a plurality of times in a wave shape.

Since the cross-flow fan constructed as described above has a form in which the blade 4 penetrates the blade holding plate 2, the blade positions on the left and right of the blade holding plate 2 are substantially coincident with the rotational direction N and the radial direction. And the shapes are almost the same. Therefore, the left and right winds flow in the same way at the time of inflow and at the time of outflow, so that the occurrence of turbulence due to the blade holding plate 2 portion is reduced, and the interference of the flow is reduced, so that the rotation sound secondary and the left and right interference sounds are generated. Can be reduced.

Further, the same air volume is obtained on the left and right with the blade holding plate 2 as a boundary, and in addition, the blade holding section L
_{In 1} , L ₂ , L _3, ..., Both ends have the same chord length, the same phase in the rotation direction, and the same blade position outer diameter, so there is little deviation toward one end, and the total length of the cross-flow fan is Can efficiently blow air in the direction perpendicular to the original axis, and can increase the air volume.

Further, in a portion where the chord length near the vane holding plate 2 is large and the vane position outer diameter is large (chord length Ca, vane position outer diameter Da), the blade mounting angle θa (from the rotation center O to the outer peripheral side). (An angle formed by a straight line connecting the ends and a straight line connecting both ends of the string)
Is large. Therefore, the width of the inter-blade passage formed between the adjacent blades is narrowed, the inflow amount can be suppressed, and the capacity is suppressed. Further, in the portion where the chord length is small and the blade position outer diameter is small, the blade mounting angle θb is small. Therefore, the width of the passage between the blades is widened to increase the inflow amount and enhance the performance.

Further, the arc of the blade cross section is such that the larger the chord length is, the larger the cross section arc radius Ra is, and the outer circumference angle βa (the tangent line of the straight line connecting the center of rotation or the outer circumference side end and the outer circumference) The angle is gradually increased from the angle formed by the tangent line of the blade arc at the side edge) to the outer peripheral angle βb of the portion where the chord length is small and the peripheral speed becomes small. Therefore, it is possible to make the manner of inflow and outflow of air to the blades substantially uniform over the entire length of the cross-flow fan.

Here, the decrease in the air volume in the vicinity of the blade holding plate so far due to the obstacle due to the existence of the blade holding plate 2 increases the chord length Ca or increases the arc radius Rb of the blade section near the outer circumference of the impeller. This can be improved by adjusting the increase in the outer peripheral angle βa. As described above, by improving so that the air blowing action is made uniform over the entire length of the cross-flow fan, not only the secondary sound of rotation and the left-right interference sound can be effectively reduced, but also the sound quality is improved and the noise level is reduced. Alternatively, the air volume can be increased.

Regarding the primary rotational sound, the upper end of the blade 4 located on the outer peripheral side of the impeller is referenced once with the other end 4sa on the inner peripheral side in the order of large and small or small and large, or Since it is changed a plurality of times, the line seen in the longitudinal direction connecting the upper ends 4a and 4b of the blades located on the outer peripheral side forms a wavy inclination with respect to the rotation axis, and the line is rotated on the same blade. A phase change is formed once or a plurality of times in the order of forward / backward advance or backward / forward / backward with respect to the direction N, and the pressure when the wind flows in and passes through the blades 4 is dispersed temporally and spatially. One-time pressure fluctuation can be reduced, and noise can be reduced.

In the present embodiment, the blade 4 is manufactured so that the cross-section of each part overlaps the same cross-section line when viewed in the longitudinal direction, and a large phase change can be obtained by simply mounting the blade 4 in parallel with the axis to achieve pressure fluctuation. Can be dispersed to effectively reduce the primary sound of rotation. In this case, the arc radius Ra of the cross-section A of the portion that extends to the outside due to the increased chord length is made larger than the arc radius Rb of the cross-section B, but the portion that extends to the outside is linear. Can also obtain the phase change. Even if a part of the other part of the cross section of the blade 4 is a straight line, it does not deviate from the gist of the present invention.

Further, by manufacturing the blades 4 as described above, the outer diameters of the blade positions in the blade holding sections L ₁ , L ₂ , L ₃ ... Are larger and smaller in the longitudinal direction as the chord length changes. It will change in a wavy manner one or more times in descending order.
In other words, since the phase will also shift in the radial direction,
The inter-blade dimension, the wind intake position, and the wind discharge position are slightly different in the longitudinal direction, and the same effect as the phase change before and after in the rotation direction can be obtained, and the effect of reducing the primary sound of rotation can be enhanced. .

Further, in the blade holding section, the action of the flow having the shifted phases is performed without difficulty, so that the action of promoting the pressure fluctuation in the vicinity of the blade holding portion is reduced. Therefore, the secondary rotation sound of the blade holding portion and the left and right interference sound can be smoothly reduced. Furthermore,
Since the phase shifts in the rotational direction and the radial direction are formed with the intervals l ₁ , l ₂ , l ₃ ... Which are not fixed in the longitudinal direction, the gradients of the shifts are slightly different. The effect of breaking the uniformity can be further facilitated without difficulty, and resonance in the longitudinal direction is less likely to occur, so that the effect of reducing the first-order rotational noise can be improved.

In addition to the above-mentioned impeller structure, the primary rotation noise can be reduced by inclining the entire blade with respect to the axial direction or arranging the blades in the rotational direction at unequal intervals. The effect can be improved.

Regarding the manufacture of the blades, since the position and shape of the blade groove 3 are the same for each blade holding plate 2, the same mold can be used. Further, regarding the blade 4, since the cross section of each portion is formed so as to overlap the same cross section line when viewed in the longitudinal direction, there is an advantage that a mold having the same cross sectional shape in the longitudinal direction can be used. In particular, it is easy to manufacture this as a metal material by pressing or the like, a thin plate can be used, and a cross-flow fan resistant to temperature changes can be obtained.

Further, regarding the strength, since the blade 4 is held by a portion having a large chord length, the blade becomes rigid and the impeller has a large torsional strength. When stacked, the blade holding plate 2 serves as a support to prevent deformation. When the blades 4 are held at a portion where the chord length is small (Cb) by changing the order of the chord length change to small and large, the diameter of the blade holding plate 2 can be made small, and the material can be reduced, which is an effect peculiar to the embodiment. There is.

The blade 4 and the blade holding plate 2 may be made of resin. Further, although there is a problem in manufacturing, the effect of improving noise can be obtained even if the blade 4 and the blade holding plate 2 are made of resin and are partially integrated in the circumferential direction and are combined to form an impeller. Further, in the above embodiment, the inner end of the impeller of the impeller 4 is linear, but the inner diameter Ds of the impeller position may change in the longitudinal direction. By adjusting to the change on the outer peripheral side of the impeller, it is possible to effectively improve the effect of reducing the primary sound of rotation and the improvement of plate cutting in production.

FIGS. 3 to 6 show another embodiment, in which the blades are not overlapped on the same line when viewed in the longitudinal direction. That is, the dimensional shape or position of the blade of the vertical cross section is changed along the longitudinal direction so that the upper end moves forward in the rotational direction and the upper end moves backward.

[Embodiment 2] FIG. 3 is a cross-sectional view of essential parts of blades of a cross-flow fan according to another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 indicate the same parts. FIG. 3 shows the second embodiment, in which the phase change in the rotation direction or the phase change of the blade position outer diameter has a chord length in the longitudinal direction with reference to one end on the inner peripheral side in the width direction of the blade. Is formed with a large radius of curvature at a large portion of and a small radius of curvature at a portion of small chord length.

In the embodiment shown in FIG. 3, the lower end 5s of the blade 5 is not changed, and the chord length of the blade is larger in the portion where the outer diameter of the blade position is larger than that in the portion where the outer diameter of the blade position is smaller. In addition, the radius of curvature Ra is increased, the attachment angle θa is increased, and the forward inclination of the blade is strengthened, so that the outer peripheral angle βa is smaller than the outer peripheral angle βb by the larger outer diameter of the blade position. That is, Ca> Cb, βa <βb, Ra> R
b, θa> θb.

As a result, on the same blade, the phase change between the rotation direction and the blade position outer diameter can be configured.
With regard to the performance of noise and air volume, it is possible to obtain the same operational effects as those of the first embodiment shown in FIG. Particularly, in the present embodiment, the portion where the outer diameter of the blade position is large (Da)
Since the blade 5a has a large inclination, the blade-to-blade dimension between the adjacent blades becomes small, and the blade-to-blade dimension change is obtained in the longitudinal direction. The effect that can be reduced can be increased.

[Third Embodiment] FIG. 4 is a cross-sectional view of essential parts of blades of a cross-flow fan according to still another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 indicate the same parts. FIG. 4 shows the third embodiment, in which the phase change in the rotation direction or the phase change in the outer diameter of the blade position makes the cross-sectional shape substantially the same in the longitudinal direction, and the front and rear in the direction perpendicular to the chord. It was formed by doing so.

The form shown in FIG. 4 is the chord length Ca, C of the blade 6.
b and the radii of curvature Ra and Rb are the same, and are moved back and forth in parallel to the direction perpendicular to the chords so as to move forward in the rotational direction on the same blade at the blade position outer diameter side and the blade position inner diameter side. It constitutes a phase change between the backward and the backward. That is, Ca = Cb, βa <βb, Ra
= Rb, θa> θb.

As a result, the same effects as those of the first embodiment can be obtained with respect to noise and air flow performance. In particular, in the present embodiment, the blades have the same cross-sectional shape and the positions are only forward and backward in parallel, which is advantageous in that the design and manufacture are easy. In FIG. 4, the blade outer peripheral angle βb at the position 6b advancing in the rotational direction becomes large and the blade position outer diameter Db becomes small.
As a result, the blowing capacity can be made uniform in the length direction.

[Fourth Embodiment] FIG. 5 is a cross-sectional view of a main part of a blade of a cross-flow fan according to still another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 indicate the same parts. FIG. 5 shows a fourth embodiment in which the phase change in the rotation direction or the phase change in the blade position outer diameter is based on one end on the inner peripheral side in the width direction of the blade and the outer peripheral side on the other end. Is formed by advancing or retracting in the rotational direction, and the radius of curvature is increased in the cross section advancing in the rotational direction, and the radius of curvature is decreased in the receding cross section.

In the embodiment shown in FIG. 5, the chord lengths of the blades 7 are set to be substantially the same, and the upper end is referred to the lower end 7sa, and the upper end is set forward 7b and the reverse 7a in the rotational direction.
By increasing b, the outer peripheral angles βb and βa are made the same, and in the same blade, a phase change between the rotation direction and the blade position outer diameter is formed at the outer diameter side end. That is, Ca≈Cb, βa = βb, Ra <Rb, θa <θ
It is b.

As a result, with respect to the performance of noise and air volume, it is possible to obtain the same effects as those of the first embodiment shown in FIG. 2, and the design and manufacture are as easy as the embodiment of FIG. There is an advantage. The phase change at the outer diameter side end can be obtained larger than that in the embodiment of FIG.

[Fifth Embodiment] FIG. 6 is a cross-sectional view of essential parts of blades of a cross-flow fan according to still another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 indicate the same parts. FIG. 6 shows a fifth embodiment, in which the chord lengths Ca, Cb and the radii of curvature Ra, Rb of the blades 8 are made the same, and the blade position is changed so as to change the phase of the rotation angle α. On the outer diameter side and the blade position inner diameter side, a phase change back and forth in the rotation direction is formed on the same blade. That is,
Ca = Cb, βa = βb, Ra = Rb, and θa = θb.

As a result, the same operational effects as those of the first embodiment shown in FIG. 2 can be obtained in terms of noise and air flow performance. Particularly, in the present embodiment, the upper ends (upper ends of the blades) 8a, 8b and the lower ends 8sa, 8sb of the strings are on the same line of rotation, and the outer peripheral angles βb and βa are the same, so that the inflow and outflow of the wind are smoothed. However, there is an advantage that the blowing capacity is high.

In each of the above-mentioned embodiments, the change in the chord length of the blade cross section in the order of large and small or small and large may not necessarily be a fine one like a sine curve, and is the same in the blade holding plate portion. As long as the position and the shape, it may look like a sawtooth or a stepped portion. However, in this case, the change in the blade holding section is preferably set such that the gradient is about 45 ° or less. In the present invention, these are referred to as wavy.

According to each of the above embodiments, the blade holding plate 2
Since the left and right blades 4 do not have to be changed in position and shape to be the same to reduce the interference of the left and right flows, it is possible to reduce the secondary sound of rotation and the interference noise of the left and right, and to provide a low noise cross-flow fan with good sound quality. You can At the same time, in the blade holding section, since the phase of each blade changes in the rotation direction or in the radial direction, the rotation sound primary can be reduced without obstructing the flow of the blade holding plate portion. It is possible to provide a low-noise once-through fan that can reduce the secondary promotion effect, have good sound quality, low noise, and a large air volume.

Further, the blade is provided with a phase change in a manner of advancing and retreating in the rotational direction, and this is made into a wavy change in the longitudinal direction which is natural, and at the same time, a phase change is also made in the radial direction. Further, by providing the intervals that are not standardized in the longitudinal direction, it is possible to provide a cross-flow fan with the above-mentioned effect. Further, the configuration in which the positions and shapes of the blades 4 are aligned on the left and right of the blade holding plate 2 and the phase is changed in the rotation direction and the blade position outer diameter on the same blade is particularly easy to manufacture by metal working.

[0050]

As described above in detail, according to the present invention, the secondary rotational sound promoted by the left and right flow interference of the blade holding plate and the left and right interference sound (fluid noise) generated by the left and right flow interference. ) Is reduced, and a low-noise once-through fan with good sound quality can be provided. In addition, it is possible to provide a cross-flow fan having a good sound quality, a low noise, and a large air volume by reducing the primary effect of the rotational sound generated in the blade holding section to reduce the promoting effect of the secondary rotational sound.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a shape of a main part of a cross-flow fan according to an embodiment of the present invention.

FIG. 2 is a sectional view of the main part of FIG. 1 taken along the line EE.

FIG. 3 is a cross-sectional view of essential parts of blades of a cross-flow fan according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view of essential parts of blades of a cross-flow fan according to still another embodiment of the present invention.

FIG. 5 is a cross-sectional view of essential parts of blades of a cross-flow fan according to still another embodiment of the present invention.

FIG. 6 is a cross-sectional view of essential parts of blades of a cross-flow fan according to still another embodiment of the present invention.

FIG. 7 is a perspective view showing an example of a conventional cross-flow fan.

[Explanation of symbols]

1 ... Boss, 2 ... blade holding plate, 3 ... groove, 4 ... blade, 4a,
4b ... Upper end of blade, Ca, Cb ... Chord length, Ra, Rb ... Arc radius, θa, θb ... Mounting angle, βa, βb ... Outer peripheral angle, L
₁ , L ₂ , L ₃ ... Blade holding section, l ₁ , l ₂ , l ₃ ... Interval, D
a, Db ... blade position outer diameter, Ds ... blade position inner diameter, N ... rotation direction, O ... rotation center.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Koji 800, Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Pref., Tochigi Headquarters, Hitachi, Ltd. 800 Tomita, Todai, Tochigi Headquarters, Hitachi, Ltd.

Claims (18)

[Claims] 1. A cross-flow fan comprising a plurality of blade holding plates arranged at appropriate intervals in a longitudinal direction of a rotating shaft, and a plurality of blades provided at intervals in a circumferential direction near an outer periphery of the blade holding plate, The positions of attachment of the plurality of blades on the left and right of the blade holding plate and the shape of the blade are set to be substantially the same, and the phase that advances in the rotational direction is aligned with the longitudinal line of the outer diameter side ends of the plurality of blades between the blade holding plates. A cross-flow fan, characterized in that it has a shape in which the phase and the receding phase are alternately changed. 2. The blade position outer diameter in a cross section perpendicular to the longitudinal direction forms a large and small phase change in the longitudinal direction of the blade in accordance with the phase change in the rotation direction. Once-through fan. 3. The shape of the phase change in the longitudinal direction line of the outer diameter side end of a large number of blades is formed in the rotational direction one or more times in the order of forward / backward advancement or backward / forward / backward movement. The cross-flow fan according to claim 1. 4. The cross-flow fan according to claim 1, wherein the phase change in the rotation direction or the phase change in the blade position outer diameter is wavy. 5. The one according to claim 1, wherein the phase change in the rotational direction or the phase change in the blade position outer diameter is formed at a non-standardized interval in the longitudinal direction of the rotating shaft of the impeller. One-through fan. 6. A phase change in a rotational direction or a phase change of a blade position outer diameter is performed by a change in a dimensional shape or a position of a vertical cross section of the blade along a longitudinal direction of the blade. Alternatively, a cross-flow fan as described in 2 above. 7. A phase change in a rotational direction or a phase change in a blade position outer diameter is formed by changing the chord length of the blade or the blade material width substantially, and changing the position in the vertical cross section along the longitudinal direction. Claim 1 or 2 characterized in that
A cross-flow fan of any of the ones listed. 8. The cross-flow fan according to claim 1, wherein the phase change in the rotation direction or the phase change in the blade position outer diameter is performed by a change in the chord length of the blade. 9. A phase change in the rotational direction or a phase change in the outer diameter of the blade position changes in the order of the chord length of the blade in the longitudinal direction with respect to the linear other end located on the inner peripheral side in the longitudinal direction. 3. The cross-flow fan according to claim 1, wherein the cross-flow fan is formed by changing it once or a plurality of times. 10. A cross-flow fan comprising a plurality of blade holding plates arranged at appropriate intervals in a longitudinal direction of a rotating shaft, and a plurality of blades provided at intervals in a circumferential direction near an outer periphery of the blade holding plate, The plurality of blade holding plates are provided with grooves for a large number of blades around the rotation axis, and the positions and shapes of the grooves of the plurality of blades of all the blade holding plates are adjusted to be substantially the same so that a large number of blades are formed. The blades are inserted into the grooves and arranged so as to penetrate all the blade holding plates, and then the large number of blades are fixed to each blade holding plate to form a horizontally long cage impeller. A cross-flow fan having a shape in which a phase advancing in a rotational direction and a phase receding in a rotational direction are alternately changed in a longitudinal direction line at an outer diameter side end of a large number of blades. 11. The phase change in the rotational direction is wavy, and the shape of the phase change in the longitudinal line of the multiple blades is
It is formed once or several times in the order of forward backward backward forward or backward forward backward backward in the rotation direction, and in addition, the blade position outer diameter in the cross section perpendicular to the longitudinal direction changes phase in the longitudinal direction of the blade. 11. The cross-flow fan according to claim 10, wherein the cross-sectional shapes of the blades and the mounting positions of the blades are substantially the same in all the blade holding plate portions. 12. A phase change in the rotational direction or a phase change in the blade position outer diameter is performed by changing the dimension or shape of the vertical cross section of the blade along the longitudinal direction of the blade. Or a cross-flow fan as described in 11 above. 13. A phase change in the rotational direction or a change in the blade position outer diameter causes a radius of curvature at a portion having a large chord length in a cross section perpendicular to the longitudinal direction with reference to one end on the inner peripheral side in the width direction of the blade. And a small radius of curvature in a portion having a small chord length.
Or a cross-flow fan as described in 11 above. 14. The phase change in the rotational direction or the phase change in the blade position outer diameter is formed by making the cross-sectional shape in a cross section perpendicular to the longitudinal direction substantially the same and moving back and forth in the direction perpendicular to the chord. A cross-flow fan according to any one of claims 10 or 11, characterized. 15. A change in phase in the rotational direction or a change in outer diameter of a blade position is formed by advancing or retracting the outer peripheral side of the other end in the rotational direction with one end on the inner peripheral side of the width direction of the blade as a reference. A cross-flow fan according to any one of claims 10 or 11, characterized in that 16. The cross-flow fan according to claim 15, wherein the cross-section fan advancing in the rotational direction has a large radius of curvature and the cross-section receding has a small radius of curvature. 17. The blade is made of a metal material, one end in the width direction of the blade is made to be a straight line in the longitudinal direction, the other end is varied in width in the longitudinal direction with reference to the one end, and a cross section perpendicular to the longitudinal direction is at least one. The cross-flow fan according to any one of claims 1, 10 and 11, wherein all or part of the fan is formed into an arc and the cross-section of each part overlaps with the same cross-section line. 18. One end in the width direction of the blade is linear in the longitudinal direction, the other end is varied in width in the longitudinal direction with reference to the one end, and a cross section perpendicular to the longitudinal direction is an arc at least partially or entirely. The cross section of each part is formed so as to overlap with the same cross section line, and the arc of the cross section of the impeller near the outer circumference of the impeller has a larger arc radius as the chord length increases. Once-through fan.