JP2005337056A - Cross flow fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a delivery amount of air by effectively enlarging an air suction area of a cross flow fan without generation of an interfering sound and to realize reduction of air blow sound. <P>SOLUTION: In the cross flow fan provided with a fan rotor 30b between a tongue part 32b and a scroll part 31b, guide vanes 13a, 13b for previously rotating suction air in a direction opposite to a rotation direction of the fan rotor 30b are only provided near the tongue part 32b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to the structure of a cross flow fan.

  A so-called cross-flow fan in which a fan rotor made up of a large number of blades (blades) is provided in a spiral air passage formed by a tongue portion and a scroll portion, and air flows in the radial direction of the fan rotor, for example, has been conventionally used. It is widely used in indoor units for air conditioners.

  Various proposals have been made to increase the discharge air volume of such a crossflow fan.

  As one of them, for example, as shown in FIG. 6, the rotation center of the fan rotor 30 </ b> B extends over the entire area of the air suction port of the air passage 10 b formed between the tongue portion 32 b and the scroll portion 31 b. There are a plurality of guide blades 13a to 13j arranged in a concentric circular arc shape at opposite angles to the blades 30, 30... Of the fan rotor 30B (see, for example, Patent Document 1).

  According to such a configuration, the air flow sucked into the fan rotor 30B can be swirled in advance in the direction opposite to the rotation direction on the air suction port side of the fan rotor 30B to increase the suction air volume. As a result, it is possible to increase the discharge air volume of the cross flow fan toward the air outlet and the air outlet passage 9b and to improve its performance.

Japanese Patent No. 2715784 (Specifications, pages 1-3), FIG.

However, in the case of the configuration as described above, a large number of guide blades 13a to 13j are arranged, so that the blades 30, 30... Of the fan rotor 30B interfere with the guide blades 13a to 13j. interference sound is generated and a sound, for example, 5m in ³ / ^{min~30m 3} / air volume zone of min, guide vanes 13a~13j had significantly increased the blowing noise and comparing that there is no (e.g. graphs of FIG. 3 reference).

  The present invention has been made to solve such a problem, and the fan rotor as described above is provided by installing the guide blade or the structure acting as the guide blade only in the vicinity of the tongue portion or in the tongue portion itself. It is an object of the present invention to provide a cross flow fan capable of effectively expanding the air suction area without generating interference noise with the blades and increasing the discharge air volume.

  In order to achieve the above object, the present invention is configured with the following problem solving means.

(1) First Problem Solving Means The first problem solving means of the present invention is a cross-flow fan comprising a fan rotor 30b between a tongue portion 32b and a scroll portion 31b. Only in the vicinity, guide vanes 13a and 13b are provided for pre-rotating the intake air in the direction opposite to the rotation direction of the fan rotor 30b.

  According to such a configuration, the guide vanes 13a and 13b are provided in the vicinity of the tongue portion 32b having a large influence on the aerodynamic performance to contribute to an increase in the intake air volume, while the guide vanes 13c to 13c in the entire air suction side suction region are provided. The number of 13j can be greatly reduced, and the Nz sound due to the interference with the blades 30, 30,... Of the fan rotor 30B can be reduced as much as possible.

(2) Second Problem Solving Means According to a second problem solving means of the present invention, in the configuration of the first problem solving means, a small number of guide blades 13a and 13b are provided in the vicinity of the tongue portion 32b. It is characterized by having.

  It is sufficient that the number of guide blades is one or two in the vicinity of the tongue portion 32b, and this alone can effectively contribute to an increase in the intake air volume.

(3) Third Problem Solving Means The third problem solving means of the present invention is a cross-flow fan comprising a fan rotor 30b between the tongue portion 32b and the scroll portion 31b, and the tongue portion 32b includes Is characterized by providing slits 14a and 14b for pre-rotating the intake air in a direction opposite to the direction of rotation of the fan rotor 30b.

  According to such a configuration, in the vicinity of the tongue portion 32b having a large influence on the aerodynamic performance, the slit portion 14b is provided with slits 14a and 14b that perform the intake air pre-rotation similar to the guide vane. , 14b contributes to an increase in the intake air volume, while eliminating the guide vanes 13a to 13j in the entire air suction port side suction region, and as much as possible the Nz sound due to the interference with the blades 30, 30,. Reduce.

(4) Fourth Problem Solving Means A fourth problem solving means of the present invention is configured to be applied to an air conditioner in the configuration of the first, second or third problem solving means. It is characterized by that.

  According to the first, second, or third problem solving means, the air suction area of the crossflow fan is expanded and the Nz noise is effectively reduced, so that it is suitable for various air conditioners. Become.

  As a result of the above, according to the present invention, it is possible to reduce the rotational speed, blowing sound, and shaft power of the cross flow fan as much as possible under the same air volume, for example, indoor units for ceiling-embedded air conditioners and the like It is possible to provide a high-performance cross flow fan suitable for various air conditioners.

<First Embodiment>
First, FIG. 1 shows a configuration when the crossflow fan according to the best embodiment 1 of the present invention is applied to a ceiling-embedded air conditioner.

  The air conditioner in this embodiment is a two-side blow type ceiling embedded type air conditioner using two cross flow fans of the present invention.

  That is, in this embodiment, as an example, a two-way blown ceiling-embedded air conditioner 1 is configured using two sets of first and second left and right crossflow fans (fan rotors 30A and 30B) having the same capacity. Reference numeral 2 denotes a cassette-type main body casing of the ceiling-embedded air conditioner 1. The main body casing 2 is embedded in the ceiling 3 such that the decorative panel 4 portion on the lower surface side thereof is continuous with the ceiling 3 of the room in substantially the same plane.

  The decorative panel 4 of the main body casing 2 has an elongated main air inlet and a main air inlet that are located at the center in the illustrated left-right direction (left-right direction on the paper) and extend to both ends in the front-rear direction (the vertical direction on the paper). A passage 5 is provided, and further, on the inner upper side thereof, the first and second air passages 10a, which are divided in two directions via the fan rotors 30A, 30B of the two left and right sets of the first and second cross flow fans, 10b is continuously provided. In addition, on the left and right sides of the air suction port 5 of the decorative panel 4 of the main body casing 2, an air outlet and an air outlet passage 9a having a predetermined width extending to both ends in the front-rear direction for blowing out temperature-controlling air. , 9b are provided.

  In the case of this embodiment, the air suction port and the air suction passage to the fan rotors 30A and 30B include the main air suction port and the main air suction passage 5 to the fan rotors 30A and 30B in the center of the decorative panel 4, and It consists of two sets of the main air inlet and the air outlets on both the left and right sides of the main air inlet 5 and the auxiliary air inlet and the auxiliary air inlet passages 5a and 5b between the air outlet passages 9a and 9b. .

The main air suction port and the main air suction passage 5 are provided between the partition walls a and a inside the drain pans 29A and 29B on the decorative panel 4, and the sub air suction port and the sub air suction passages 5a and 5b are provided as tongue portions. Further, it is formed between the vertical wall portion C ₂ for forming the air blowing passage and the like and the outer side partition wall C ₁ of the drain pans 29A, 29B and is curved in the direction of the air inlet of the tongue portions 32a, 32b.

  On the other hand, the first and second air passages 10a and 10b are connected to the main air suction port and the main air suction passage 5 through the grill part G and the filter part F, and through the grill part G1 and the filter part F1. A parabolic scroll that smoothly makes a U-turn from the auxiliary air inlet and the auxiliary air intake passages 5a and 5b through the upper space portion thereof in a Y-shape in the direction of the air outlet and the air outlet passages 9a and 9b. The portions 31a and 31b are integrated with each other, and are formed between the scroll portions 31a and 31b and the tongue portions 32a and 32b facing each other.

  The upper and lower airflow passages 10a and 10b are located in the right and left bifurcated regions upstream of the first and second air passages 10a and 10b, and the upper ends are in contact with each other, while the lower ends are spaced apart from each other at a predetermined inclination angle. The first and second heat exchangers 12A, 12A, 12B corresponding to the fan rotors 30A, 30B of the first and second cross flow fans in a substantially square shape (inverted V shape) having a large inclination angle. 12B is installed.

  Each of the first and second heat exchangers 12A and 12B has a main body part M forming the same C-shaped part, and a predetermined V-shaped shape further outward from the lower end of the main body part M. The auxiliary portion S is bent at the angle θ. For example, the auxiliary portion S is divided independently of the main body portion M, and the number of heat transfer tube rows is formed to be half that of the main body portion M, so that the inflow pressure loss of air is greatly reduced. Yes.

The lower ends of the main body part M and the auxiliary part S connected to each other are on the outer side forming the auxiliary air outlets of the drain pans 29A and 29B on the decorative panel 4 and the auxiliary air suction passages 5a and 5b. Is supported on a drain pan bottom portion (groove portion) b between the partition wall C ₁ and the main air suction port and the main air suction passage 5 side partition wall a.

Further, of the main body M and the auxiliary portion S, the upper end of the auxiliary portion S bent in a dogleg shape passes through the sub air outlet and the downstream area of the auxiliary air suction passages 5a, 5b, and the tongue portions 32a, 32b and auxiliary air intake passage 5a, the tongue 32a of the air inlet side of the vertical wall portion C ₁ forming the 5b, abuts against fixed to 32b near (just below), auxiliary air inlet and auxiliary air intake By efficiently sucking the air sucked through the passages 5a and 5b into the fan rotors 30A and 30B with a low pressure loss, heat is exchanged efficiently.

  In addition, in this case, in the case of this embodiment, the blades 30, 30,... Of the fan rotor 30B are positioned in the vicinity of the tongue portions 32a, 32b on an arc concentric with the rotation center of the fan rotor 30B. The first and second guide blades 13a and 13b having an angle opposite to that are arranged in a row.

  According to such a configuration, the air flow sucked into the fan rotors 30A and 30B is swung in the direction opposite to the rotation direction in the vicinity of the air suction port side tongue portions 32a and 32b of the fan rotors 30A and 30B. The intake air volume can be increased, thereby increasing the discharge air volume of the cross flow fan toward the air blowing passages and the air blowing passages 9a and 9b, and the performance can be improved.

  Therefore, in the case of this configuration, when the first and second cross flow fans 30A and 30B, which are the air blowing means, are driven, for example, during cooling or heating operation, the entire body portion M and auxiliary portion S as a whole. Temperature-controlled air (cool air or warm air) effectively exchanged heat through the W-type heat exchangers 12A and 12B having a large heat exchange area is blown out horizontally from both the left and right air outlets 9a and 9b. Is gradually lowered downward by natural convection, so that a comfortable cooling or heating air-conditioning environment for the user is realized.

  As described above, in this embodiment, in the crossflow fan including the fan rotors 30A and 30B between the tongue portions 32a and 32b and the scroll portions 31a and 31b, the vicinity of the tongue portions 32a and 32b. Only, guide vanes 13a and 13b for pre-rotating the intake air in a direction opposite to the rotation direction of the fan rotors 30A and 30B are provided.

  According to such a configuration, the guide vanes 13a and 13b are provided in the vicinity of the tongue portion 32b having a large influence on the aerodynamic performance to guide the intake air smoothly and contribute to the increase of the intake air volume, while the air intake side The number of guide blades 13c to 13j in the entire suction region can be greatly reduced, and the Nz sound due to the interference with the blades 30, 30,... Of the fan rotor 30B can be reduced as much as possible.

  In this case, the number of guide blades 13a and 13b may be one to several in the vicinity of the tongue portions 32a and 32b, and the number of guide vanes 13a and 13b can contribute to an increase in the intake air volume effectively.

As a result, compared to the case of FIG. 6 having the conventional large number of guide vanes 13a-13j, for example, as shown in the graph of FIG. 3, the same air volume in the range of air volume 5m ³ / min~30m ³ / min of the foregoing It is possible to effectively reduce the total amount of noise including the Nz sound below.

  In particular, when paying attention to the effect of reducing the Nz sound, for example, as shown in the graph of FIG. 4, it can be seen that the Nz sound is effectively reduced in a wide range of frequencies of about 100 Hz to 1 KHz.

<Best Embodiment 2>
Next, FIG. 2 shows a configuration of a cross flow fan portion of a ceiling-embedded air conditioner configured using the cross flow fan according to the second preferred embodiment of the present invention.

  In this embodiment, unlike the first embodiment, the tongues 32a and 32b corresponding to the fan rotors 30A and 30B of the crossflow fan are directly opposite to the rotation direction of the fan rotors 30A and 30B. It is characterized by providing slits 14a and 14b for pre-rotating the intake air in the direction.

  According to such a configuration, in the vicinity of the tongue portions 32a and 32b having a large influence on the aerodynamic performance, the slit portions 14a that perform the intake air pre-rotation action on the tongue portions 32a and 32b themselves are the same as the guide vanes 13a and 13b described above. , 14b and the slits 14a, 14b contribute to an increase in the suction air volume, while the guide blades 13a-13j in the entire air suction port side suction region are completely eliminated and the blades 30, 30 ... of the fan rotors 30A, 30B are eliminated. The Nz sound due to the interference is reduced as much as possible.

  Even with such a configuration, the same effects as those of the first embodiment can be obtained.

It is sectional drawing which shows the structure of the ceiling embedded type air conditioner comprised using the crossflow fan which concerns on the best Embodiment 1 of this invention. It is an expanded sectional view which shows the structure of the crossflow fan part of the ceiling embedded type air conditioner. It is a figure which shows the "air volume-noise characteristic" of the same ceiling embedded type air conditioner. It is a figure which shows the "Nz sound reduction characteristic" of the same ceiling embedded type air conditioner. It is an expanded sectional view which shows the structure of the crossflow fan part of the ceiling embedded type air conditioner comprised using the crossflow fan which concerns on the best Embodiment 2 of this invention. It is an expanded sectional view which shows the structure of the conventional crossflow fan part.

Explanation of symbols

  1 is a ceiling-embedded air conditioner, 2 is a main body casing, 3 is a ceiling, 4 is a decorative panel, 5 is a main air suction port and a main air suction passage, 5a and 5b are sub air suction ports and sub air suction passages, 9a and 9b are air outlets and air outlet passages, 10a is a first air passage, 10b is a second air passage, 12A is a first heat exchanger, 12B is a second heat exchanger, and 13a and 13b are Guide vanes, 30A is a first fan rotor, 30B is a second fan rotor, 31a and 31b are scroll portions, 32a and 32b are tongue portions, M is a main body portion, and S is an auxiliary portion.

Claims (4)

  A cross-flow fan comprising a fan rotor (30b) between a tongue portion (32b) and a scroll portion (31b), wherein the fan rotor (30b) rotates only in the vicinity of the tongue portion (32b). A cross flow fan, characterized by providing guide vanes (13a) and (13b) for pre-rotating the intake air in a direction opposite to the direction.   The crossflow fan according to claim 1, wherein a small number of guide vanes (13a) and (13b) are provided in the vicinity of the tongue (32b).   A cross flow fan comprising a fan rotor (30b) between a tongue portion (32b) and a scroll portion (31b), wherein the tongue portion (32b) includes a rotation direction of the fan rotor (30b) and A crossflow fan characterized by providing slits (14a) and (14b) for pre-rotating suction air in the opposite direction. 4. The cross flow fan according to claim 1, wherein the cross flow fan is configured to be applied to an air conditioner.

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