JP2007040543A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of suppressing noise without impairing air blowing performance by suitably combining an outer circumferential vane inflow angle and a chord length of a cross flow fan, and a stabilizer central angle facing it. <P>SOLUTION: The air conditioner is comprised by providing the cross flow fan 4 facing a stabilizer 1a, in a draft duct 3 comprised of a rear guider 2 and a front guider 1 including the stabilizer 1a and a tongue part 1b. It is composed such that the stabilizer central angle θ by a line connecting an axis of the cross flow fan 4 and a tip of a gap by the stabilizer 1a, and a line connecting the axis of the cross flow fan and the tongue part 1b is within a range of 30°≤θ≤35°, the outer circumferential blade inflow angle β1 is within a range of 25.3°≤β1≤28.7° and the chord length C of the cross flow fan 4 is within a range of 12 mm≤C≤13.2 mm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioner. More specifically, the air flow performance is improved by combining the outer peripheral blade inflow angle and the chord length of the crossflow fan with the stabilizer central angle facing the crossflow fan. The present invention relates to a structure that can suppress the generation of noise without being damaged.

  As a conventional crossflow fan used in an air conditioner, in a crossflow fan in which a plurality of impellers each holding a plurality of blades are connected by supporting plates on both sides and an intermediate portion, an outer peripheral blade angle ( The value of the dimensionless impeller ratio X expressed by (β1 / β0) / τ is 4.5 to 5.0, where the inflow angle is β0, the inner peripheral blade angle (outflow angle) β1, and the knot ratio τ. In which the combination of the outer peripheral blade angle (inflow angle) β0, the inner peripheral blade angle (outflow angle) β1, and the knot chord ratio τ of the impeller has been disclosed (for example, Patent Document 1).

  However, in the cross flow fan configured as described above, for example, when used in an air conditioner, there is no consideration on how to set the stabilizer central angle facing the cross flow fan. When used in an air conditioner, there has been no disclosure of a sufficient configuration to prevent the blowing performance from being impaired or to suppress the generation of noise more effectively.

JP-A-6-323294

  Accordingly, the present invention has been made to solve the above-described problems, and the object thereof is to suitably combine the outer peripheral blade inflow angle and the chord length of the cross flow fan, and the stabilizer central angle opposed thereto. Thus, an object of the present invention is to provide an air conditioner that can suppress the generation of noise without impairing the blowing performance.

In order to achieve the above-described object, the present invention has the following features.
In the air conditioner provided with a cross flow fan facing the stabilizer in the air passage composed of a front guider and a rear guider including a stabilizer and a tongue,
The stabilizer central angle θ between the line connecting the axis of the cross flow fan and the tip of the gap by the stabilizer and the line connecting the axis of the cross flow fan and the tongue is in the range of 30 ° ≦ θ ≦ 35 °. The outer peripheral blade inflow angle β1 of the crossflow fan is in the range of 25.3 degrees ≦ β1 ≦ 28.7 degrees, and the chord length C of the crossflow fan is in the range of 12 mm ≦ C ≦ 13.2 mm. It is characterized by being comprised so that it may become.

  Further, the numerical value of any one of the stabilizer central angle θ, the outer peripheral blade inflow angle β1, or the chord length C is specified, and the remaining one numerical value is set to be variable. It is characterized by.

  According to the present invention, the air blowing performance as an air conditioner is not impaired by determining the combination of the outer peripheral blade inflow angle and the chord length of the cross flow fan and the stabilizer central angle facing the cross blade fan. And generation of noise can be more effectively suppressed.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view of an air conditioner according to the present invention, in which (A) is a longitudinal sectional view, (B) is a front view, and FIG. 2 is a main part explanatory view showing Embodiment 1 of the air conditioner according to the present invention. (A) is a cross-sectional view showing the blade shape of the cross-flow fan, (B) is a cross-sectional view showing the cross-flow fan, a front guider and a rear guider including a stabilizer and a tongue, and FIG. (A) is a graph of the flow angle characteristic of the outer peripheral blade of the cross flow fan, (B) is a graph of the chord length-flow characteristic of the cross flow fan, and (C) is a graph of the stabilizer center angle-flow characteristic. FIG. 4 is a graph showing efficiency and noise characteristics. FIG. 4A is a flow-efficiency graph when a conventional crossflow fan and a crossflow fan according to the present invention are used, and FIG. Is a graph showing .

  As shown in the drawing, the air conditioner according to the present invention is the air sucked from the suction port a into the air passage connecting the suction port a provided in the upper part of the main body and the blower outlet b provided in the lower part of the main body. The stabilizer is provided in the air passage 3 formed by the filter c for removing the dust, the heat exchanger f for exchanging heat of the air from which the dust has been removed, the front guider 1 and the rear guider 2 including the stabilizer 1a and the tongue 1b. The cross flow fan 4 disposed opposite to 1a is provided.

  In recent years, the filter c automatically removes dust adhering to the filter c at regular intervals by an automatic cleaning device d equipped with a dust box e so that the ventilation resistance at the location does not increase. Therefore, efficient operation can be performed without generating noise.

  In recent years, in order to make it possible to easily remove fine dust by the automatic cleaning device d, the automatic cleaning device d has an air resistance, and the filter c is finer and has a higher air resistance than a conventional filter. Since the fan is used, the cross flow fan 4 must be used in a high-speed rotation region to achieve a high air volume, and it is difficult to avoid a high noise compared to the case where a conventional filter is mounted. It has become a tendency.

  Therefore, in the present invention, the outer peripheral blade inflow angle β1 and the chord length C of the cross flow fan 4 and the stabilizer center angle θ opposed thereto are set to suitable parameter values, or set and combined. As an air conditioner, it is configured so that the generation of noise can be suppressed without impairing the blowing performance.

  The cross flow fan 4 is configured by connecting a plurality of impellers each having a plurality of blades held by end plates on both sides and intermediate support plates in the axial direction. The outer peripheral blade inflow angle β1, the inner peripheral blade outflow angle β2, the number of blades Z, the outer diameter D of the impeller, the chord length C, and the like.

  Here, based on FIG. 2 (A) and FIG. 2 (B) shown as Example 1, the said cloth | cross for suppressing generation | occurrence | production of noise, without impairing ventilation performance as an air conditioner. Regarding the specifications of the impeller of the flow fan 4, preferred parameter values obtained from experimental results will be described, and a line connecting the axis of the cross flow fan 4 and the tip of the gap 5 by the stabilizer 1a, and the cross flow fan Regarding the stabilizer central angle θ by the axis 4 and the line connecting the tongue portion 1b, suitable parameter values obtained from the experimental results will be described in the same manner as the specifications of the impeller.

  The cross flow fan 4 has optimum values for each of the parameter values described above. For example, the outer peripheral blade inflow angle β1 is 28 degrees, the inner peripheral blade outflow angle β2 is 90 degrees, and the chord length C is 12.5 mm. When the maximum plate thickness position (inner diameter side) is 50%, the outer diameter D of the impeller is 98 mm, and the number of blades Z is 35 sheets, as shown in FIG. We have obtained experimental results that have a high-performance flow-efficiency curve compared to cross-flow fans.

  Moreover, the numerical value range that is a preferable parameter value obtained from the experimental results is shown in FIG. 4B as a noise characteristic graph. A flow coefficient φ = 0.48 that can be determined as a characteristic is set as a threshold.

  Among the specifications of the impeller, for example, the inner peripheral blade outflow angle β2 is set to 90 degrees, the number of blades Z is set to 35, and the outer diameter D of the impeller is set to 98 mm. A preferable experimental result regarding the blade inflow angle β1 will be described based on the graph of “the outer peripheral blade inflow angle-flow rate characteristic of the impeller” shown in FIG.

  By setting the outer peripheral blade inflow angle β1 of the impeller to 25.3 degrees or more and 28.7 degrees or less, the flow rate φ = 0.48 is better than the conventional value for the threshold value. Since experimental values that can realize noise characteristics have been obtained, an angle range of 25.3 degrees ≦ β1 ≦ 28.7 degrees is a preferable parameter value.

  Further, the chord length C of the impeller is set to a numerical value range of 12 mm or more and 13.2 mm or less as shown in FIG. On the other hand, since an experimental value that can realize better noise characteristics than the conventional one is obtained, a numerical value range of 12 mm ≦ C ≦ 13.2 mm is a preferable parameter value.

  The stabilizer central angle θ between the line connecting the axis of the cross flow fan 4 and the tip of the gap 5 by the stabilizer 1a and the line connecting the axis of the cross flow fan 4 and the tongue 1b is shown in FIG. As shown in (C), by setting the angle range to 30 degrees or more and 35 degrees or less, an experimental value that can realize better noise characteristics than the conventional value with respect to the threshold value of the flow coefficient φ = 0.48. Therefore, an angle range of 30 degrees ≦ θ ≦ 35 degrees is a preferable parameter value.

  Accordingly, the cross flow fan in which the outer peripheral blade inflow angle β1 is set in the range of 25.3 degrees ≦ β1 ≦ 28.7 degrees and the chord length C is set in the range of 12 mm ≦ C ≦ 13.2 mm. 4 is actually used in an air conditioner in which the stabilizer central angle θ is set in a range of 30 degrees ≦ θ ≦ 35 degrees, so that the blowing performance as an air conditioner is not impaired, and Generation of noise can be more effectively suppressed.

  The parameter values such as the outer peripheral blade inflow angle β1 of the impeller, the chord length C of the impeller, and the stabilizer center angle θ specify any two numerical values, while the remaining one numerical value is By configuring so as to be variable, a more suitable combination of parameter values can be easily realized.

It is explanatory drawing of the air conditioner by this invention, (A) is a longitudinal cross-sectional view, (B) is a front view. BRIEF DESCRIPTION OF THE DRAWINGS It is principal part explanatory drawing which shows Example 1 of the air conditioner by this invention, (A) is sectional drawing which shows the blade | wing shape of a crossflow fan, (B) contains a crossflow fan, a stabilizer, and a tongue part. It is sectional drawing which shows a front guider and a rear guider. (A) is a graph of the flow angle characteristic of the outer peripheral blade of the cross flow fan, (B) is a graph of the chord length-flow characteristic of the cross flow fan, and (C) is a graph showing the flow characteristic. It is a graph of a stabilizer center angle-flow rate characteristic. It is a graph which shows an efficiency and a noise characteristic, (A) is a flow-efficiency graph at the time of using the conventional crossflow fan and the crossflow fan by this invention, (B) is a graph which shows a noise characteristic.

Explanation of symbols

1 Front guider
1a Stabilizer
1b Tongue 2 Rear guider 3 Air passage 4 Cross flow fan 5 Gap a Suction port b Air outlet c Filter d Automatic cleaning device e Dust box f Heat exchanger

Claims (2)

In the air conditioner provided with a cross flow fan facing the stabilizer in the air passage composed of a front guider and a rear guider including a stabilizer and a tongue,
The stabilizer central angle θ between the line connecting the axis of the cross flow fan and the tip of the gap by the stabilizer and the line connecting the axis of the cross flow fan and the tongue is in the range of 30 ° ≦ θ ≦ 35 °. The outer peripheral blade inflow angle β1 of the crossflow fan is in the range of 25.3 degrees ≦ β1 ≦ 28.7 degrees, and the chord length C of the crossflow fan is in the range of 12 mm ≦ C ≦ 13.2 mm. An air conditioner characterized by being configured to be.   One of the numerical values of the stabilizer central angle θ, the outer peripheral blade inflow angle β1, and the chord length C is specified, and the remaining one numerical value is set to be variable. The air conditioner according to claim 1.

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