WO2004029463A1

WO2004029463A1 - Cross flow fan and air conditioner with the fan

Info

Publication number: WO2004029463A1
Application number: PCT/JP2003/012090
Authority: WO
Inventors: Mitsuyoshi Ishijima; Yuuko Hongou
Original assignee: Toshiba Carrier Corporation
Priority date: 2002-09-24
Filing date: 2003-09-22
Publication date: 2004-04-08
Also published as: JPWO2004029463A1; CN100552230C; CN1685159A; AU2003266567A1

Abstract

A cross flow fan (1) for an air conditioner capable of reducing a load on a motor while reducing the noise of a blower, comprising a plurality of blades (2θ1, 2θ2) and support plates (3, 4) pivotally supporting the plurality of blades (2θ1, 2θ2) at both ends thereof, characterized in that the plurality of blades (2θ1, 2θ2) are disposed annularly on the support plates so as to form a cyclic pseudo-random series while maintaining a periodicity at two different pitch angles (θ1, θ2) so that, when a displacement Δ as the ratio of a difference (θ1 - θ2) between the two pitch angles to a pitch angle (θ) when all blades are disposed at equal intervals is Δ = (θ1 - θ2)/θ, the displacement Δ is 0.09 ≤ Δ ≤ 0.26.

Description

Cross-flow fan and air conditioner equipped with it

The present invention relates to a cross flow fan used for an air conditioner or the like, and more particularly to a cross flow fan that increases air volume, reduces blower noise and motor load, and an air conditioner including the same.

Ming Background technology In general, a cross flow fan such as an indoor unit of an air conditioner is provided with a tongue in a case provided around the cross flow fan in order to prevent a backflow of air and to improve a blowing efficiency.

However, by providing this tongue, a vortex is likely to be generated near the tongue, and when the wings periodically cross the vortex generated here, the blade noise is increased. This blade noise can be reduced by moving the tongue away from the wings, but if the tongue is moved away from the wings, there is a problem that backflow increases and the cross-flow fan's blowing efficiency decreases.

On the other hand, since the blades generate noise when the blades pass periodically, the blade pitch is shifted from being arranged (equally distributed) at equal angles, and the blades are aperiodically shifted. A random pitch wing is used to pass through. This random pitch blade design method uses random numbers in manufacturing, so the blade pitch angles for each blade are all different, which makes it complicated in drafting design drawings, processing blades, and manufacturing fans. In addition, it takes time to use, and the use of random number calculation is troublesome in terms of design simplicity.In evaluation, it is necessary to calculate a number of patterns and select the one that seems to be the best in trial production or simulation. This required additional time and effort.

Then, in order to reduce such a problem, the one described in Japanese Patent Application Laid-Open No. H8-74783 (Patent Document 1) has been proposed. The cross flow fan described in Patent Document 1 has two pitch angles that are set so that the blade pitch angles of the blades have a predetermined deviation angle from each other. Thus, each blade pitch angle has a periodic pseudo-random sequence or an array pattern including a periodic pseudo-random sequence. In this cross-flow fan, the frequency spectrum of the blade noise, which is the frequency at the evenly distributed blade pitch angle, is subjected to phase modulation by a signal close to random noise, and the spectrum is diffused, and the peak value of the spectrum is reduced. Periodic noise can be reduced.

However, in recent years, there has been an increasing demand for downsizing, silencing and energy saving of air conditioners, and there has been a demand for an increase in air flow to a cross flow fan, a reduction in blower noise and a reduction in motor load.

On the other hand, in the cross-flow fan structure of Patent Document 1, when the outer diameter of the fan is enlarged and the gap between the fan and the heat exchanger installed around the fan is narrowed, the pitch noise component of the blades increases, and the blowing noise deteriorates. In addition, there is a problem that the motor load increases.

Therefore, without increasing the pitch noise component of the blades, a cross flow fan that can increase the air volume, reduce the ventilation noise, and reduce the motor load by increasing the outer diameter of the fan and narrowing the gap with the heat exchanger installed around the fan Was requested.

The present invention has been made in consideration of the above-described circumstances, and without increasing the pitch noise component of the blades, it is possible to increase the outer diameter of the fan and to reduce the air flow by reducing the gap between the heat exchanger installed around the fan. It is an object of the present invention to provide a cross-flow fan capable of reducing noise, fan noise and motor load.

Another object of the present invention is to provide an air conditioner employing the above-described cross flow fan and capable of reducing the blowing noise and the motor load.

Disclosure of the invention

Means for Solving the Problems The present inventors have intensively studied for realizing the above object, and have found that the deviation 等 = (θ ₂ -θ _% ) with respect to equally spaced angles and the difference between two pitch angles (0 2-0 (degrees) and As a result of examining and evaluating the relationship between noise and motor load in the air conditioner, the deviation of equiangular corners and the difference between the two pitch angles within a specific range allowed the fan outer diameter to increase and It has been found that even if the air flow is increased by narrowing the gap with the heat exchanger installed around the fan, it is possible to reduce the blowing noise and the motor load. However, the air volume was increased, ventilation noise and motor load were reduced. That is, in order to achieve the above object, according to one aspect of the present invention, there are provided a plurality of wings, and a support plate for supporting the plurality of wings at both ends thereof, wherein the plurality of wings are different from each other.

While having periodicity at _two pitch angles e e2, the ring is arranged in a ring on the support plate so as to form a periodic pseudo-random sequence, and the pitch angle is 0 with respect to a pitch angle of 0 when all the wings are arranged at equal intervals. The difference between the two pitch angles (the magnitude of the deviation of θ ₂ — 0, Δ = (Θ ₂ — SJ / 、, where the magnitude of the deviation 0 is 0.09≤Δ≤0.2 A cross-flow fan characterized in that the wings are arranged so as to be 6 is provided.

This realizes a cross flow fan that can increase the air volume by increasing the outer diameter of the fan, reduce the blowing noise and reduce the motor load without increasing the blade pitch sound component. According to a preferred embodiment, the difference (2-0) between the two different pitch angles is

1 ° (degrees) ≤ (θ ₂ - θ, it is preferably in the range of ≤2 7 ° (degrees)..

Further, the plurality of wings are curved outward and have an arc shape having the same shape, and have a periodicity at two different pitch angles Θθ ₂ while forming a periodic pseudo-random sequence. It is desirable that the support plate is arranged in an annular shape so as to form a ring.

Further, the support plate supporting both ends of the wing is any combination of an end plate and an end plate, an end plate and a partition plate, or a partition plate and a partition plate.

In addition, the plurality of blades are provided on the support plate horizontally with respect to the rotation axis direction, but may be provided between the support plates so as to be inclined with respect to the rotation axis direction.

Still further, the above object is to provide a body having an air inlet,

A heat exchanger provided in the main body facing the air suction port;

A fan casing provided with a space between the heat exchanger and the heat exchanger;

A cross flow fan provided in the space,

The cross flow fan includes a plurality of blades, a year plurality of blades includes a support plate, for supporting at both ends, said plurality of blades, while having a periodicity in two different pitch angles 0 There 0 _2, periodic The difference between the two pitch angles with respect to the pitch angle とき when all the wings are arranged at equal intervals (the magnitude of the deviation of S ₂ — 0 J Now, when Δ = (θ ₂ −Θ,) no 0, the blades are arranged in the cross flow fan such that the magnitude of the deviation 0 is 0.09≤Δ≤0.26. This is achieved by providing an air conditioner. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view of one embodiment of a cross flow fan according to the present invention.

FIG. 2 is an enlarged perspective view showing a part II in FIG.

FIG. 3 is a cross-sectional view of an embodiment of the cross flow fan according to the present invention.

FIG. 4 is a longitudinal sectional view of an indoor unit of an air conditioner using a cross flow fan according to the present invention.

FIG. 5 is a perspective view of another embodiment of the cross flow fan according to the present invention.

FIG. 6 is a perspective view showing a VI portion of FIG. 5 in an enlarged manner.

FIG. 7 is a diagram showing the results of noise and electric motor load tests using the cross flow fan according to the present invention with respect to the deviation of the pitch angle from the equally-spaced angle.

FIG. 8 is a result diagram regarding a difference in pitch angle between a noise and a motor load test using the cross flow fan according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of a cross flow fan according to the present invention will be described with reference to the accompanying drawings. .

As shown in FIG. 1 to FIG. 3, the cross flow fan 1 according to the present invention, forward curved (circumferential Direction outward), a plurality of vanes 20 ₁ and the wing 2 ₉₂ arc shape having the same shape And the end plate 3 or the partition plate 4 to which the wings 2 _ei and _{2θ 2} are attached, and the plurality of wings 2 _e or 2 _θ2 (adjacent ones in the illustrated form) have two different pitch angles. while having periodicity in 0 There 0 ₂ are arranged annularly so as to form a periodic pseudo-random sequence. Further, the wings _2θ or 2 _{S 2} are arranged under the following conditions. For example, the difference Θ of the difference (Θ ₂ -Θ) between the above two pitch angles with respect to the pitch angle とき when all the wings are arranged at equal intervals is represented by Δ = (θ ₂ -θ) / Θ (Where the denominator 0 is the pitch angle when all the wings are arranged at equal intervals), the magnitude of the deviation 上記 is set to 0.09≤Δ≤0.26 . And the difference between _two different pitch angles (Θ ₂ — is in the range of 1 ° ≤ (0 ₂ —0 J ≤2.7 °).

If Δ is smaller than 0.09 or larger than 0.26, blast noise and electric motor If the load increases and the pitch angle difference is smaller than 1 degree or exceeds 2.7 degrees, the ventilation noise and motor load increase.

Here, the wings 2 form a periodic pseudo-random M-sequence. To arrange 2 _{e 2} , set each corner to 0 ₂ ,

[Equation 1]

Θ ₂ = (1 + Δ) θ _x …… (1)

far. Here, Δ is an appropriate positive value, and indicates the magnitude of deviation from equal distribution.

In the M-sequence, the number that becomes 1 is one more than the number of 0, so the number of 0 ₂ is 2 ^η Θ! Is 2 1. Therefore

[Equation 2]

^{_{^{2 n - 2 + (2 11}}} - 11) = 360 ( degrees) (2)

From equations (1) and (2)

[Equation 3]

= 360 / {(2 ⁿ — 1) + 2 ⁿ - ¹ △} (degrees) …… (3—1)

And easily requested. The value of 0 ₂ is obtained from equation (2).

Thereafter, 0 and 1 of the M-series arrangement pattern, that is, those of the period 7, 0, 1, 0, 1, 1, 0, 1 in accordance with setting the sequentially arranged to the wing pitch S E and 0 ₂ To go. If a large pitch angle 0, when 1 is set up to the pitch angle decreases, when respectively 0 ₂ and 0 E, in which case

[Equation 4]

0 = 360 /! {(2 η - 1) + (2 η - 1 - 1) Δ} a (degree) (3-2).

Next, a case where the cross flow fan according to the present invention is used for an indoor unit of an air conditioner will be described.

As shown in FIG. 4, a front suction port 13 and an upper suction port 14 are opened in the indoor unit body 12 of the indoor unit 11 of the air conditioner, and the indoor unit body 12 has A first indoor heat exchanger 15 which is curved so as to protrude forward is provided on the front side, and a second indoor heat exchanger 16 which is inclined downward is provided on the upper side. Furthermore, in the space formed by the first indoor heat exchanger 15, the second indoor heat exchanger 16 and the fan casing 17, A cross flow fan 1 according to the present invention having a structure as shown in FIG. 2 is provided. The cross-flow fan 1 has a larger diameter than the conventional one, and the gap g between the cross-flow fan 1 and the first indoor heat exchanger 15 is set smaller than in the conventional case. Further, a dew receiving member 18 is provided below the first indoor heat exchanger 15, and a part thereof protrudes to form a tongue 19, and this tongue 19 and the cross flow fan A small gap is formed between them.

As described above, the cross-flow fan 1 has a structure in which the difference between the two pitch angles is 0.09≤Δ≤0.26. Even if the gap g with the installed heat exchanger 15 is narrowed, the specific blade pitch sound component does not increase, so the fan outer diameter dimension does not increase without increasing the blade pitch sound component. Large air volume can increase airflow noise and reduce motor load. Furthermore, by setting the difference between the _two different pitch angles (0 ₂ -e to be in the range of 1 degree ≤ (0 ₂ -Θ ≤ 2.7 degrees), the effect of reducing the ventilation noise and motor load can be reduced. There is.

Further, another embodiment of the cross flow fan according to the present invention will be described.

In the above-described embodiment shown in FIG. 1, a plurality of blades are provided on the end plate or the partition plate horizontally with respect to the rotation axis direction. It is provided at an angle.

For example, as shown in FIG. 5 and FIG. 6, the cross flow fan 1 A of this embodiment has an impeller having a plurality of blades 2 Alpha _{theta 1} and the wing 2 Alpha _{theta 2,} the wing 2 A _el, 2 Α _{Θ 2} is a periodic pseudo-random sequence having characteristics close to a random signal while having periodicity at two different pitch angles Θ and θ ₂ angles, and the end plate 3 Α (partition plate 4 A) It is arranged annularly on one side. Furthermore, the wing ₂ A _el, 2 A _e 2 are arranged inclined at a predetermined angle, one frame 5 A is formed, the frame 5 A are stacked. The other configuration is not different from the cross flow fan shown in FIG. 3, and the description is omitted.

Therefore, even if the outside diameter of the fan is enlarged and the air flow is increased by narrowing the gap between the fan and the heat exchanger installed around the fan, the specific pitch noise component of the blade is not increased, and the blowing noise In addition, reduction of the electric load can be achieved.

Next, using a cross flow fan according to the present invention as shown in FIG. 2, (1) shift △ = (0 ₂ with respect to equidistant angle - when changing the value of e J, (2) 2 single Pick When the angle difference was changed, the noise of the air conditioner and the motor load at were measured under the following conditions.

Conditions: constant air flow 900m ³ / h,

Gap g 1 5mm

Results: shown in FIGS. 7 and 8.

For (1), as can be seen from Figure 7, deviation △ = pitch angle - the value of (θ ₂ θ ₁₎ / Θ is, in 0. 0 9≤Δ≤ 0. 2 6, noise 4 It was 9 dΒ or less, and when the deviation of the pitch angle was around 0.2, it was approximately 48 dB, which proved to be suitable for practical use. On the other hand, it was found that when the pitch angle deviation was smaller than 0.09, it exceeded 49 dB, and when it exceeded 0.26, it exceeded 49 dB and increased sharply.

When the pitch angle deviation is 0.09≤Δ≤0.26, the motor load is 41.5 W or less, and when the pitch angle deviation is near 0.2, it is 41W. It turned out to be suitable for practical use. On the other hand, if the pitch angle deviation is smaller than 0.09, it exceeds 41.5 W, and the motor load increases sharply, while if the pitch angle deviation exceeds 0.26 It exceeded 41.5W and was found to increase rapidly.

Also, in the case of (2), as can be seen from FIG. 8, the value of the difference between the pitch angle (02 _{0), 1≤ (θ 2 - 0 ≤} 2 - At 7, noise in the following 4 9 d B In the vicinity of 2, the difference was about 48 dB, which proved to be practical.On the other hand, when the difference was smaller than 1 °, it exceeded 49 dB, and when it exceeded 2.7 °, it exceeded 49 dB. It was found that the noise exceeded the dB level.

Also, the difference in pitch angle 1≤ - In _{(θ 2 θ,) ≤ 2.} 7, motor load is less than 4 1. 5W, the difference is 2. 0 ° vicinity, and at 4 1W or less, practically It turned out to be suitable. On the other hand, if the difference is less than 1 °, it exceeds 41.5W and the motor load increases sharply, while if the difference exceeds 2.7 °, it exceeds 41.5W and increases sharply. I found out.

As is clear from the above embodiment, according to the cross flow fan according to the present invention, the fan outer diameter can be increased and the gap between the fan and the heat exchanger installed around the fan can be increased without increasing the blade pitch sound component. The airflow can be increased by reducing the airflow, and the noise of the blast and the motor load can be reduced. Industrial applicability

By using the cross flow fan according to the present invention for the indoor unit of an air conditioner, it is possible to reduce the air volume, the blowing noise and the motor load, and to reduce the size, noise and energy consumption of the air conditioner. It has great industrial applicability, such as being able to adequately meet the demands of Japan.

Claims

The scope of the claims

1. multiple wings,

Supporting plate for supporting the year plurality of blades at both ends, in the lateral flow fan consisting of capital, the plurality of blades, while having a periodicity in two different pitch angles e physician theta _2, so as to form a periodic pseudo-random sequence The difference between the two pitch angles with respect to the pitch angle 0 when all the wings are arranged at equal intervals (Θ ₂ -Θ

! )) Is (θ _ζ -θ) / 、, the magnitude of the deviation

The cross flow fan, wherein the blades are arranged so that Δ is 0.09≤Δ≤0.26.

2. The difference between the two pitch angles (θ ₂ — is 1 ° ≤ (Θ ₂ ~,)) ≤ 2.

The cross flow fan according to claim 1, wherein the cross flow fan has a range of 7 °.

3. The plurality of blades is curved outwardly facing, Ri Contact an arc shape having the same shape, while having periodicity in two different pitch angles 0 There 0 _2, a periodic pseudo-random sequence 2. The cross flow fan according to claim 1, wherein the cross flow fan is annularly arranged on the support plate.

4. The support plate that supports both ends of the wing is any combination of an end plate and an end plate, an end plate and a partition plate, or a partition plate and a partition plate. Cross-flow fan according to item 1.

5. The cross flow fan according to claim 1, wherein the plurality of blades are provided on a support plate horizontally with respect to a rotation axis direction.

6. The cross flow fan according to claim 1, wherein the plurality of blades are provided between the support plates so as to be inclined with respect to a rotation axis direction.

7. Body with air inlet,

A heat exchanger provided in the main body facing the air suction port;

A fan casing provided with a space between the heat exchanger and the cross flow fan provided in the space,

The cross flow fan includes a plurality of blades, a year plurality of blades includes a support plate, for supporting at both ends, said plurality of blades, while having a periodicity in two different pitch angles 0 There 0 _2, periodic A difference between the two pitch angles (Θ _2- ,) with respect to the pitch angle とき when all the wings are arranged at equal intervals E is arranged in an annular shape on the support plate so as to form a pseudo-random series. When the size の is Δ = (θ ₂ −θ,) / Θ, the blades are arranged in the cross flow fan so that the magnitude △ of the deviation is 0.0926. A characteristic air conditioner.