ES2649146T3 - Air conditioner - Google Patents

Abstract

Air conditioner comprising: a transverse flow fan (10) in which blade wheels (12A, 12B) each including blades (15) aligned in a circumferential direction are aligned in an axial direction; and a stabilizer (32, 232) and a rear guide (20, 120, 220) that are provided on respective sides of an outer periphery of the cross flow fan (10) to form an air passage, a main end portion of at least one of the stabilizer (32, 232) and the rear guide (20, 120, 220) having a multi-step shape such that it includes portions of level difference that deviate in the circumferential direction of the cross flow fan ( 10), and including the level difference portions at least a first level difference portion (26, 126, 127) that opposes an intermediate portion in the axial direction of a corresponding blade wheel (12A, 12B ) characterized in that blades (15) of a blade wheel (12A, 12B) that opposes the first level difference portion and of a blade wheel (12A, 12B) adjacent to this blade wheel (12A, 12B ) are provided to be diverted from each other a predetermined angle in the circumferential direction, and in one direction from one end to the other end in the axial direction, the direction of deviation in the circumferential direction of the first level difference portion (26, 126, 127) opposes the direction deviation in the circumferential direction of the blades (15) of the two adjacent blade wheels (12A, 12B).

Description

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DESCRIPTION

Air conditioner Technical field

The present invention relates to an air conditioner that includes a cross flow fan. Background

A cross flow fan is a blower that extends in the axial direction and includes a plurality of blades aligned in the direction of rotation. The transverse flow fan used in an air conditioner is arranged such that blade wheels each having vanes are aligned in the axial direction and connected between st. In an air conditioner that includes this transverse flow fan, a stabilizer and a rear grille to oppose the outer periphery of the fan, respectively. The stabilizer is called a front tongue portion, while a part of the rear tongue, part that extends from the main end portion to the portion closest to the fan, is called a rear tongue portion. These tongue portions form an air passage on the blow side out of the fan. Between each tongue portion and the fan, a vortex air flow is generated. When a fan blade passes through this vortex air flow, wind noise (NZ noise) is generated due to interference between the vortex air flow and the blade.

To reduce this wind noise, in known arrangements, the wind noise generation moments are dispersed by differentiating the positions of the adjacent blade wheel vanes or by changing the shape of the tongue portions.

As an example of wind noise reduction by changing the shape of the tongue portions, patent document 1 refers to the positions where a front tongue portion and a rear tongue portion are closest to the fan differ in the direction of rotation axis between the blade wheels. In other words, the front tongue portion and the rear tongue portion each have level difference portions each in a position that opposes the connection portion of the blade wheels. With this arrangement, since the moment at which the blade passes through the main end of the front tongue portion or the rear tongue portion is different between the blade wheels, the wind noise generation moments are

they disperse and wind noise is reduced. As another example, patent document 2 describes a fan of

transverse flow in which the number of concave and convex in an irregular part formed at the end of a stabilizer is equal to the number of transverse flow fans arranged in series and the convex are made to correspond to the positions on the side of the fans, in order to reduce noise. Patent documents 3 to 6 describe similar cross flow fans.

[List of references]

[Patent Document]

[Patent document 1] Japanese unexamined patent publication No. 62-118094 [Patent document 2] Japanese unexamined patent publication No. S63-113198 A [Patent document 3] European unexamined patent publication n No. 2 405 206 A1 [Patent document 4] Chinese unexamined patent publication No. 1 752 461 A [Patent document 5] Japanese unexamined patent publication S62-131994 A [Patent document 6] Patent publication Japanese unexamined S62-6903 [Summary of the invention]

[Technical problem]

However, in the air conditioner of patent document 1, wind noise is reduced to a certain extent since the moments at which the blades pass through the main end of the front tongue portion or the rear tongue portion are different between the blade wheels, but the noise reduction effect is insufficient since one blade of a blade wheel passes through the main end of the front tongue portion or the rear tongue portion at the same time.

An objective of the present invention is to provide an air conditioner in which wind noise is

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reduce even more.

[Solution to the problem]

According to the first aspect of the invention, an air conditioner includes: a cross-flow fan in which blade wheels, each including blades aligned in a circumferential direction, are aligned in an axial direction; and a stabilizer and a rear grille that are provided on respective sides of an outer periphery of the cross flow fan to form an air passage, a main end portion of at least one of the stabilizer and the rear grille, which has a shape of multiple steps such that it includes portions of level difference that deviate in the circumferential direction of the cross flow fan, and portions of level difference that include at least a first portion of level difference that opposes an intermediate portion in the axial direction of a corresponding one of the blade wheels, in which the blades of a blade wheel opposing the first portion of the level difference and of a blade wheel adjacent to this blade wheel are provided to be offset from each other by a predetermined angle in the circumferential direction, and in one direction from one end to the other end in the axial direction, while or the direction of deviation in the circumferential direction of the first level difference portion that opposes the direction of deviation in the circumferential direction of the blades of the adjacent two blade wheels.

In this air conditioner, the main end portion of at least one of the rear grille and the stabilizer has the first level difference portion that deflects in the circumferential direction and opposes the intermediate portion in the axial direction of the blade wheel, and therefore the length of time during which a blade passes through the main end of the stabilizer or the rear crane is divided into before and after reaching the first portion of level difference. Therefore, wind noise is not generated at the same time by means of a vane, and wind noise is generated in a divided manner. In this way, wind noise is reduced.

According to the second aspect of the invention, the air conditioner of the first aspect is arranged so that the level difference portions include a second level difference portion that opposes a connection portion between the blade wheels.

In this air conditioner, the main end portion of the stabilizer or the rear end has the second level difference portion that deflects in the circumferential direction and opposes the connection portion between the blade wheels. With this, the moment of the generation of the wind noise differs between the blade wheels, with the result that the wind noise is further reduced.

According to the third aspect of the invention, the air conditioner of the first or second aspect is arranged so that the height of a part between two contiguous portions of the level difference is constant in the axial direction.

In this air conditioner, since in the main end portion of the stabilizer or the rear grille the part between the two contiguous level difference portions extends linearly in the axial direction, the stabilizer or the rear grille is easily manufactured .

According to the fourth aspect of the invention, the third aspect air conditioner is arranged such that the level difference portions include the at least a first level difference portion that includes one or more first level difference portions. which opposes the intermediate portion in the axial direction of each of two contiguous wing wheels and a second level difference portion that opposes a connecting portion of the two adjacent wing wheels, in a direction from one end to the other end in the axial direction, a direction of deviation in the circumferential direction of the first level difference portion opposes a sense of deviation in the circumferential direction of the second level difference portion, and parts of the main end portion, parts that oppose the two adjacent wing wheels, are identical in shape and height.

In this air conditioner, the main end portion of the stabilizer or the rear grille has the first level difference portion in the range that opposes two contiguous of the blade wheels, and the parts, which oppose the two Flap wheels, the main end portion of the rear grille or the stabilizer are identical in shape and height. Therefore, it is easy to manufacture the rear grille or the stabilizer. In addition, the main end portion of the rear grid or the stabilizer is arranged to be substantially identical in height in general.

According to the fifth aspect of the invention, the third aspect air conditioner is arranged so that the level difference portions include two second level difference portions that oppose connection portions between the blade wheel which is opposes the first level difference portion and the blade wheels on the respective sides of the blade wheel that opposes the first level difference portion, in one direction from one end to the other end in the axial direction, a sense of deviation in the circumferential direction of the first portion of level difference opposes a sense of deviation in the

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circumferential direction of the second portion of level difference, and an angle of deviation in the circumferential direction of the second portion of level difference is smaller than the predetermined angle.

In this air conditioner, the deflection direction of the first level difference portion is opposed to the deflection direction of the second level difference portion, the deflection direction of the blades deflected from each other in the angle The default is opposed to the direction of deviation of the first level difference portion, and the deviation angle of the second level difference portion is smaller than the predetermined angle. For this reason, the direction of temporal deviation of two wind noises generated before and after reaching the first portion of level difference is identical to the direction of temporal deviation of two wind noises generated before and after reaching the second portion of level difference. With this arrangement, wind noise is generated sequentially from one end to the other end in the axial direction of the cross flow fan. This contains the directionality due to the interference of wind noises generated between the portions of difference in level, and the noise reduction is carried out effectively throughout the room.

In accordance with the sixth aspect of the invention, the fifth aspect air conditioner is arranged so that the angle of deviation in the circumferential direction of the first portion of level difference is identical to a value calculated by dividing the predetermined angle by a result of adding 1 to the number of the first portions of level difference within a range in the axial direction of the blade wheel that opposes the first portion of level difference, and the angle of deviation in the circumferential direction of the second portion of level difference is identical to a total sum of the angle of deviation in the circumferential direction of the first portion of level difference within the range in the axial direction.

In this air conditioner, two wind noises generated before and after reaching the first level difference portion are deflected from each other by the deviation angle of the first level difference portion (the value calculated by dividing the angle of deviation (the predetermined angle) between the blades between a result of adding 1 to the number of the first portions of level difference within the range in the axial direction of the blade wheel), while two wind noises generated before and after If the second portion of level difference is reached, they deviate from each other by an angle calculated by subtracting the angle of deviation from the second portion of level difference to the angle of deviation (predetermined angle) between the blades. For this reason, the deviation time between the two wind noises generated before and after reaching the first level difference portion is arranged to be identical to the deviation time between the two wind noises generated before and after reaching the second portion of level difference. Therefore, the present embodiment achieves a noise reduction effect similar to the noise reduction effect in case the first level difference portion is not provided and the number of the wheel wheels is increased so that each Connecting portion of the blade wheels is provided to oppose the position equivalent to the first level difference portion. In other words, in the present embodiment, the blade length of the blade wheel is lengthened and the number of blade wheels is reduced, while the noise reduction capacity is maintained. In addition, the blowing characteristic is improved since the number of the connecting portions of the blade wheels, which impede ventilation, is reduced.

[Advantageous effects of the invention]

As described above, the following effects are obtained by the present invention.

According to the first aspect of the invention, the main end portion of at least one of the rear frame and the stabilizer has the first level difference portion that deflects in the circumferential direction and opposes the intermediate portion in the axial direction of the blade wheel, and consequently the length of time during which a blade passes through the main end of the stabilizer or the rear crane 20 is divided into before and after reaching the first portion of level difference. Therefore, wind noise is not generated at the same time by means of a vane, and wind noise is generated in a divided manner. In this way, wind noise is reduced.

According to the second aspect of the invention, the main end portion of each of the rear grid or the stabilizer has the second level difference portion that deflects in the circumferential direction and opposes the connection portion between the blade wheels. With this, the moment of the generation of the wind noise differs between the blade wheels, with the result that the wind noise is further reduced.

According to the third aspect of the invention, since in the main end portion of each of the rear grille and the stabilizer the part between the two contiguous level difference portions extends linearly in the axial direction, the Stabilizer or rear grille is easily manufactured.

According to the fourth aspect of the invention, the main end portion of the stabilizer or the rear crane has the first level difference portion in the range that opposes two contiguous of the blade wheels, and the parts, which are oppose the two blade wheels, of the main end portion of the rear crane or the

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Stabilizers are identical in shape and height. Therefore, it is easy to manufacture the rear grille or the stabilizer. In addition, the main end portion of the rear grid or the stabilizer is arranged to be substantially identical in height in general.

According to the fifth aspect of the invention, the direction of deviation of the first portion of level difference is opposed to the direction of deviation of the second portion of level difference, the direction of deviation of the blades deflected from one of the others in the predetermined angle opposes the direction of deviation of the first portion of level difference, and the angle of deviation of the second portion of level difference is smaller than the predetermined angle. For this reason, the direction of temporal deviation of two wind noises generated before and after reaching the first portion of level difference is identical to the direction of temporal deviation of two wind noises generated before and after reaching the second portion of level difference. With this arrangement, wind noise is generated sequentially from one end to the other end in the axial direction of the cross flow fan. This contains the directionality due to the interference of wind noises generated between the portions of difference in level, and the noise reduction is carried out effectively throughout the room.

According to the sixth aspect of the invention, two wind noises generated before and after reaching the first level difference portion are deflected from each other by the angle of deviation of the first level difference portion (the calculated value by dividing the angle of deviation (the predetermined angle) between the blades by a result of adding 1 to the number of the first portions of level difference within the range in the axial direction of the blade wheel), while two wind noises generated before and after reaching the second level difference portion are deflected from each other by an angle calculated by subtracting the deviation angle from the second level difference portion to the deviation angle (predetermined angle) between the blades. For this reason, the deviation time between the two wind noises generated before and after reaching the first level difference portion is arranged to be identical to the deviation time between the two wind noises generated before and after reaching the second portion of level difference. Therefore, the present embodiment achieves a noise reduction effect similar to the noise reduction effect in case the first level difference portion is not provided and the number of the wheel wheels is increased so that each Connecting portion of the blade wheels is provided to oppose the position equivalent to the first level difference portion. In other words, in the present embodiment, the blade length of the blade wheel is lengthened and the number of blade wheels is reduced, while the noise reduction capacity is maintained. In addition, the blowing characteristic is improved since the number of the connecting portions of the blade wheels, which impede ventilation, is reduced.

[Brief description of the drawings]

[FIG. 1] FIG. 1 is an oblique perspective of the external appearance of an indoor unit of an air conditioner in an embodiment of the present invention.

[FIG. 2] FIG. 2 is a cross section of the indoor unit.

[FIG. 3] FIG. 3 is an oblique perspective of a cross flow fan.

[FIG. 4] FIG. 4 is a partial oblique perspective of the cross flow fan and its environment in the indoor unit.

[FIG. 5] FIG. 5 is a front view of the cross flow fan and its surroundings in the indoor unit.

[FIG. 6] FIG. 6 is a top view of the cross flow fan and its environment in the indoor unit.

[FIG. 7] FIG. 7 is a cross-section taken on line A-A in FIG. 5 and FIG. 6 and is a partial enlarged view of a rear crane and its surroundings.

[FIG. 8] FIG. 8 is an oblique perspective of a part on the main end side of a rear crane.

[FIG. 9] FIG. 9 is a cross-section taken on line A-A in FIG. 5 and FIG. 6 and is a partial enlarged view of a stabilizer and its surroundings.

[FIG. 10] FIG. 10 is an oblique perspective of a front face.

[FIG. 11] FIG. 11 is a partial enlarged view of FIG. 6.

[FIG. 12] FIG. 12 is a partial enlarged view of a rear crane and a cross flow fan of another embodiment of the present invention, when viewed from above.

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[FIG. 13] FIG. 13 is an oblique perspective of a rear gma of another embodiment of the present invention.

[FIG. 14] FIG. 14 is an oblique perspective of a frontal gma of another embodiment of the present invention.

[Description of the modes of realization]

Next, an embodiment of the present invention will be described. As shown in FIG. 1, an indoor unit 1 of an air conditioner of the present embodiment is together narrowly and elongated in one direction, and is coupled to a wall of a room so that the length of the air conditioner is horizontal. The indoor unit 1 and an outdoor unit not illustrated constitute the air conditioner that cools or heats the room. Next, in this document, an outgoing direction from the wall to which the indoor unit 1 is attached will be referred to as "forward," while the direction that opposes forward will be referred to as "backward." In addition, the left-right direction in FIG. 1 will simply be called "left-right address".

As shown in FIG. 2, the indoor unit 1 includes a housing 2 and internal devices stored in the housing 2 such as a heat exchanger 3, a cross flow fan 10, a filter 4, and an electronic component box (not shown). An inlet opening 2a is formed through the upper surface of the housing 2, while an outlet opening 2b is formed through the lower surface of the housing 2. In the vicinity of the exit hole 2b, a horizontal fin 5 is provided to adjust the wind direction in the up-down direction and to open and close the exit hole 2b.

The cross flow fan 10 (hereinafter, this will simply be called a fan 10) is positioned so that its axial direction is parallel to the left-right direction. This fan 10 rotates in the direction indicated by the arrow in FIG. 2. On the front and on the back of the fan 10, a front gma 30 and a rear gma 20 (rear tongue portion), respectively, are provided to form an air passage. A substantial upper half of the frontal gma 30 is constituted by a stabilizer 32 (front tongue portion). As the stabilizer 32 and the rear gma 20 are provided on the respective sides of the fan 10, the fan 10 sucks air from the upper front and blows the air down and back. The heat exchanger 3 is positioned to surround the front side and the upper side of the fan 10. In an operation of the air conditioner, the fan 10 is operated so that indoor air is sucked through the inlet hole 2a, and the Sucked air is heated or cooled in the heat exchanger 3 and then blown out through the outlet orifice 2b.

Next, the fan 10, the rear gma 20, and the front gma 30 will be detailed.

[Fan]

As shown in FIG. 3, the fan 10 is constituted by a plurality (six in the present embodiment) of wing wheels 12 aligned in the axial direction (left-right direction) and an end plate 11.

The end plate 11 constitutes the right end portion of the fan 10. From a central portion of the right surface of the end plate 11, a protrusion portion 11a is to be connected to be connected to the rotation axis of an engine (not illustrated) to operate the fan 10.

Among the six blade wheels 12, each of the five right blade wheels 12A is composed of blades 15 aligned in the circumferential direction and a substantially annular support plate 13 connected to the left ends of the blades. The blades 15 and the support plate 13 are formed integrally. The right end of each blade 15 of each blade wheel 12A is joined by welding or the like with the adjacent end plate 11 or the support plate 13 of the blade wheel 12Acontigua.

The left-most blade wheel 12B between the six blade wheels 12 is composed of blades 15 aligned in the circumferential direction and a substantially disc-shaped end plate 14 that is connected to the left ends of the blades 15. The blades 15 are integrated with the end plate 14. The right end of each blade 15 of the blade wheel 12B is joined by welding or the like with the support plate 13 of the adjacent blade wheel 12A. From a central portion of the left surface of the end plate 14, a shaft (not shown) projects that is rotatably supported by a bearing coupled to the housing 2.

The blades 15 of each blade wheel 12 extend in the axial direction (left-right direction), and each of which is positioned such as a wing swept forward at a predetermined blade angle. The lengths of the blades 15 of each of the five blade wheels 12A are identical in the axial direction and each of the blades 15 is substantially twice as long as the length of each of the blades 15 of the

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blade wheel 12B in the axial direction. In the present embodiment, the blades 15 of each blade wheel 12 are aligned in the circumferential direction at regular intervals. The intervals of the blades 15 are identical between the six blade wheels 12. The blades 15 may be aligned at regular intervals.

As shown in FIG. 4, the blades 15 of a blade wheel 12 and the blades 15 of the adjacent blade wheel 12 deflect from each other in the circumferential direction. To be more specific, blades 15 of any given blade wheel 12 deflect from the blades 15 of the blade wheel 12 immediately to the left of any blade wheel 12 given each by an angle 0 in the direction of rotation ( indicated by the arrow in FIG. 4). In other words, from wheel 12 further to the left to wheel 12 more to the right of the six blade wheels 12, each blade 15 is deflected from the corresponding blade 15 of the adjacent blade wheel 12 by angle 0 in the sense of rotation.

[Rear grna]

The rear grille 20 is provided on the rear of the fan 10, and the lower edge of the rear grille 20 is connected to the outlet hole 2b (see FIG. 2). As shown in FIG. 5 and FIG. 6, the length in the left-right direction of the rear grille 20 is substantially identical to the length in the left-right direction of the fan 10, and the rear grille 20 opposes substantially the entire fan 10 in the left direction. right. The upper edge of the rear grid 20 is slightly above the upper edge of the fan 10 (see FIG. 2 and FIG. 6).

As shown in FIG. 2, on the surface of the rear grille 20, surface which opposes the fan 10, a part that is not the upper and lower end portions is a curved surface 21 that is substantially arc-shaped. The distance (shortest distance) between the curved surface 21 and the outer periphery of the fan 10 decreases upward.

In addition to the foregoing, the rear grille 20 includes a protruding portion 22 in a portion above the curved surface 21 (ie, to the main end side of the curved surface 21). The protruding portion 22 is substantially arc-shaped and protrudes in the direction away from the fan 10 in cross section orthogonal to the left-right direction. The distance (shortest distance) between the protruding portion 22 and the outer periphery of the fan 10 increases upwards. As described above, since the distance (shortest distance) between the curved surface 21 and the outer periphery of the fan 10 decreases upward, the rear grille 20 is closest to the fan 10 on a shore 20a (then, in this document, nearest portion 20a) between the lower edge of each protruding portion 22 and the upper edge of the curved surface 21.

As shown in FIG. 8, the protruding portion 22 is constituted by pieces of division 23 and 24 which are alternately aligned in the left-right direction. The outgoing portion 22 is constituted by six pieces of division 23 and five pieces of division 24.

Each of the division pieces 23 and 24 extends linearly along the left-right direction, and each division piece 23 is deflected from each division piece 24 by an angle a1 in the circumferential direction of the fan 10 (see FIG. 7). The cross-sectional shape of each division piece 23 in the orthogonal direction to the left-right direction is substantially identical to the cross-sectional shape of each division piece 24 in the orthogonal direction to the left-right direction. The upper edges of the six pieces of division 23 are at the same height. In addition, the upper edges of the five pieces of division 24 are at the same height.

The five right division pieces 23 of the six division 23 pieces are identical in length in the left-right direction, and each of which is substantially half as long as the wing 15 of the blade wheel 12A in the left-right direction. The left-most division piece 23 is substantially as long as the wing 15 of the blade wheel 12B in the left-right direction. The five pieces of division

24 are identical in length in the left-right direction, and each of which is substantially half as long as the wing 15 of the blade wheel 12A in the left-right direction.

A difference in level on the edge between the main end (upper edge) of the division piece 24 and the main end of the division piece 23 that is adjacent on the left is called a level difference portion

25 (second portion of level difference), while a difference in level on the edge between the main end of the division piece 24 and the main end of the division piece 23 that is adjacent on the right is called a portion of level 26 difference (first portion of level difference). The direction of deviation in the circumferential direction of the level 25 difference portion is opposed to the direction of deviation in the circumferential direction of the level 26 difference portion. The level 25 difference portion is opposed to the connection portion ( support plate 13) between the blade wheels 12 while the level difference portion 26 opposes a substantially central portion in the left-right direction of the blade wheel 12.

As shown in FIG. 11, each division piece 23 is deflected from the adjacent division part 24 on the left by an angle a1, in the direction that opposes the direction of rotation (indicated by the arrow on the

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FIG. 11) of the fan 10. In other words, the level 26 difference portion is deflected by the angle a1 in the direction that opposes the direction of rotation when viewed from left to right, while the level difference portion 25 is deflected by angle a1 in the direction of rotation of the fan 10 when viewed from left to right. As such, the direction of deviation between the two blades 15 of the two adjacent wing wheels 12, which deflect from each other by angle 0, is identical to the direction of deviation of the level 25 difference portion in the circumferential direction and opposes the direction of deviation of the level 26 difference portion in the circumferential direction. In the present embodiment, the angle a1 is substantially half as large as the angle of deflection 0 between the blades 15 of the two adjacent wing wheels 12.

[Front grna]

The front lane 30 is provided on the front of the fan 10, and the lower edge of the front lane 30 is connected to the outlet hole 2b (see FIG. 2). The front rail 30 is composed of the stabilizer 32 provided to oppose the fan 10 and a front wall portion 31 extending from the bottom edge of the stabilizer 32 to the outlet hole 2b.

As shown in FIG. 5 and FIG. 6, the length in the left-right direction of the stabilizer 32 is substantially identical to the length in the left-right direction of the fan 10, and the stabilizer 32 substantially opposes the entire fan 10 in the left-right direction. The upper edge of the stabilizer 32 is lower than the center of the fan 10 (see FIG. 2 and FIG. 5).

As shown in FIG. 9, on the surface of the stabilizer 32, which surface is opposed to the fan 10, a part that is not the upper and lower end portions is a curved surface 33 that is substantially arc-shaped. The distance (shortest distance) between the curved surface 33 and the outer periphery of the fan 10 decreases upward. The stabilizer 32 includes a flexure surface 34 that flexes to extend substantially forward from the bottom edge of the curved surface 33. The bottom edge of the flex surface 34 is connected to the front wall portion 31.

In addition to the above, the stabilizer 32 includes a flat end face 35 that extends downward and forward from the upper edge of the curved surface 33 and a convex portion 36 that is provided on the front of the end face 35 and protrudes upward to be higher than the end face 35. The convex portion 36 and the end face 35 constitute the upper end portion of the rear grille 20. The stabilizer 32 is closest to the outer periphery of the fan. 10 at an upper edge 32a (hereinafter, closest position 32a) of the curved surface 33.

As shown in FIG. 10, the stabilizer 32 (the convex portion 36, the end face 35, the curved surface 33, and the bending surface 34) is formed by division pieces 37 and 38 that alternately line up in the left-right direction . The stabilizer 32 is formed by six pieces of division 37 and five pieces of division 38.

Each of the pieces of division 37 and 38 extends linearly along the left-right direction, and each piece of division 37 and each piece of division 38 deviates from each other by an angle p1 in the circumferential direction of fan 10 (see FIG. 9). The cross-sectional shape of each division piece 37 in the orthogonal direction to the left-right direction is substantially identical to the cross-sectional shape of each division piece 38 in the orthogonal direction to the left-right direction. The upper edges of the six pieces of division 37 are at the same height. In addition, the upper edges of the five pieces of division 38 are at the same height.

The five right division 37 pieces among the six division 37 pieces are identical in length in the left-right direction, and each of which is substantially half as long as the wing 15 of the blade wheel 12A in the left-right direction. The leftmost part 37 is substantially as long as the wing 15 of the blade wheel 12B in the left-right direction. The five pieces of division 38 are identical in length in the left-right direction and each of which is substantially half as long as the wing 15 of the blade wheel 12A in the left-right direction.

A difference in level on the shore between the division piece 38 and the adjacent division piece 37 on the left is called a level difference portion 39 (second level difference portion), while a level difference on the shore between the division piece 38 and the adjacent division piece 37 on the right is called a level 40 difference portion (first level difference portion). The direction of deviation in the circumferential direction of the difference portion of level 39 is opposed to the sense of deviation in the circumferential direction of the difference portion of level 40. The difference portion of level 39 is opposed to the connection portion ( support plate 13) between the blade wheels 12 while the level 40 difference portion opposes a substantially central portion in the left-right direction of the blade wheel 12.

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As shown in FIG. 5, each division piece 37 is deflected from the adjacent division piece 38 on the left by an angle pi, in the direction that opposes the direction of rotation of the fan 10. In other words, the level 40 difference portion it is deflected by the angle pi in the direction that opposes the direction of rotation when viewed from left to right, while the level difference portion 39 is deflected by the angle pi in the direction of rotation of the fan 10 when viewed from left to right. Therefore, the direction of deviation between the two blades 15 of the two adjacent wing wheels 12, which are deflected by angle 0, is identical to the direction of deviation of the level 39 difference portion in the circumferential direction and opposes the direction of deviation of the level 40 difference portion in the circumferential direction. In the present embodiment, the angle a1 is substantially half as large as the angle of deflection 0 between the blades 15 of the two adjacent wing wheels 12.

Now, the wind noise generated between the rear grille 20 and the fan 10 will be described with reference to FIG. 11. FIG. 11 shows only the three right wing wheels 12 between the six wing wheels 12. Also, between the blades 15 of these three wing wheels 12, the figure shows only three blades 15 each of which deflects from the left in the direction of rotation by angle 0.

When the fan 10 rotates, after a substantially right half of the blade 15 more to the right of the six blades 15 that deflect from each other by angle 0 passes through the division piece 23 first, a substantially half left of this blade 15 passes through the part of division 24. A vortex air flow (indicated by the arrow in FIG. 7) is generated between the main end portion of the rear grille 20 and the fan 10, and is It generates wind noise due to interference between this vortex air flow and the blades. With respect to this, in the present embodiment, the wind noise generated when a blade 15 passes through the rear grille 20 is divided in two ways.

After the wing 15 more to the right has passed through the part of division 24, a substantially right half of the second wing 15 more to the right passes through the piece of division 23. As such, in the present embodiment, the wind noise, which is generated when two blades 15 deflected from each other by angle 0 pass through the rear grille 20, is generated at different times. Then, a substantially left half of the second rightmost wing passes through the division piece 24, and the remaining four blades 15 pass similarly through the division pieces 23 and 24 one at a time.

In addition to the above, a vortex air flow (indicated by the arrow in FIG. 9) is generated between the curved surface 33 of the stabilizer 32 and the fan 10, too, and wind noise is generated due to interference between the air flow in vortex and the blades 15 when the blades 15 pass through the curved surface 33 of the stabilizer 32. Since the stabilizer 32 is provided with the difference portions of level 39 and 40, the wind noise generated when a flap 15 passes through stabilizer 32 is generated in a dividing manner twice and the wind noise generated when two blades 15 deflected from each other by angle 0 pass through stabilizer 32 is generated at different times, in a similar way as on the rear grille 20.

As described above, in the air conditioner of the present embodiment, the main end portion of each of the rear rail 20 and the stabilizer 32 has the level difference portion 26, 40 (first portion of difference of level) which deflects in the circumferential direction and opposes the intermediate portion in the axial direction of the blade wheel 12A, and consequently the duration of time during which a blade 15 passes through the main end of the stabilizer 32 or the rear grille 20 is divided into before and after reaching the first portion of difference of level 26, 40. Therefore, wind noise is not generated at the same time by means of a blade 15, and wind noise is generated in a manner divided. In this way, wind noise is reduced.

In addition to the above, in the present embodiment, the main end portion of each of the rear grille 20 and the stabilizer 32 has the level difference portion 25, 39 (second level difference portion) that deflects in the circumferential direction and opposes the connection portion between the blade wheels 12. With this, the moment of generation of the wind noise differs between the blade wheels 12, with the result that the wind noise is reduce even more.

Furthermore, in the present embodiment, since in the main end portion of each of the rear grille 20 and the stabilizer 32 the part between the two contiguous level difference portions extends linearly in the axial direction, The stabilizer 32 or the rear grille 20 is easily manufactured.

In addition, in the present embodiment, the parts, which oppose the five blade wheels 12A, of the main end portions of the rear grille 20 and the stabilizer 32 are identical in shape and height. Therefore, it is easy to manufacture the rear gland 20 and the stabilizer 32. In addition, the main end portions of the rear gland 20 and the stabilizer 32 are arranged to be substantially constant in height in general.

In addition to the above, in the present embodiment, the direction of deviation of the first portion of difference of level 26, 40 is opposed to the direction of deviation of the second portion of difference of level 25, 39, the direction of deviation of the 15 blades deflected from each other in the angle 0 opposes the direction of

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deviation of the first portion of difference of level 26, 40, and the deviation angle of the second portion of difference of level 25, 39 is smaller than angle 0. For this reason, the direction of temporal deviation of two noises of wind generated before and after reaching the first portion of difference of level 26, 40 is identical to the direction of temporal deviation of two wind noises generated before and after reaching the second portion of difference of level 25, 39. With this provision , the wind noise is generated sequentially from one end to the other end in the axial direction of the fan 10. This decreases the directionality due to the interference of wind noises generated in the respective division parts (ie, between the portions of difference in level), and noise reduction is done effectively throughout the room.

In addition to the above, in the present embodiment, two wind noises generated before and after reaching the first portion of difference of level 26, 40 deviate from each other by the angle of deviation (a1, pi) of the first portion of difference of level 26, 40, while two wind noises generated before and after reaching the second portion of difference of level 25, 39 deviate from each other by an angle calculated by subtracting the angle of deviation ( a1, pi) of the second portion of difference of level 25, 39 to the angle of deviation 0 between the blades 15. For this reason, the time of deviation between the two wind noises generated before and after reaching the first portion of difference of level 26, 40 is arranged to be identical to the deviation time between the two wind noises generated before and after reaching the second portion of difference of level 25, 39. Therefore, the present embodiment with it follows a noise reduction effect similar to the noise reduction effect in case the first level difference portion is not provided and the number of the blade wheels 12 is increased so that each connection portion of the wheels of Alabe 12 is provided to oppose the position equivalent to the first portion of level difference. In other words, in the present embodiment, the blade length of the blade wheel 12 is lengthened and the number of the blade wheels is reduced, while the noise reduction capacity is maintained. In addition, the blowing characteristic is improved since the number of the connecting portions of the blade wheels, which impede ventilation, is reduced.

Although the embodiment of the present invention has been described it should be noted that the scope of the invention is not limited to the embodiment described above. The scope of the present invention is defined by the appended claims rather than by the above description of the embodiment, and the present invention is intended to cover all alternatives, modifications and variations that fall within the scope of the appended claims. . It is noted that the modifications below can be combined and properly implemented.

Although in the embodiment the angle of deviation a1 of the difference portion of level 25, 26 and the angle of deviation p1 of the difference portion of level 39, 40 are substantially half as large as the angle of deviation 0 between at blade 15, the angle of deviation a1 may be larger than or smaller than the angle of deviation 0. However, when the angle of deviation a1 is larger than 0/2, the angle of deviation a1 is preferably smaller that angle 0.

Although in the embodiment the direction of deviation of the first portion of difference of level 26, 40 is opposed to the direction of deviation between the blades 15 while the direction of deviation of the second portion of difference of level 25, 39 is identical to the direction of deviation between the blades 15, the direction of deviation of the first portion of difference of level 26, 40 may be identical to the direction of deviation between the blades 15 while the direction of deviation of the second portion of difference from level 25, 39 it may be that it opposes the direction of deviation between the blades 15.

Although in the embodiment the rear grille 20 has only a first level difference portion 26, 40 within a range of a blade wheel 12A in the axial direction, two or more first portions of level difference 126 and 127 may provided within a range of a vane wheel 12A in the axial direction such as in the case of a rear grille 120 shown in FIG. 12, for example. In this modification, a deviation angle a2 of a second level difference portion 125 is preferably identical to the total sum of deviation angles a3 and a4 of the first portions of level difference 126 and 127 within a range of one wheel of blade 12A in the axial direction. In addition, each of the angles of deviation a3 and a4 of the first difference portions of level 126 and 127 are preferably at a value calculated by dividing the angle of deviation 8 between the blades 15 by a number that is a result of adding 1 to the number of the first portions of level difference within the range of the blade wheel 12A in the axial direction. This arrangement makes it possible to produce the deviation time between wind noises generated before and after reaching the first level difference portion 126, 127 so that it is identical to the deviation time between wind noises generated before and after reaching the second portion of level difference 125. The angles of deviation of the two or more first portions of level difference provided within the range of a blade wheel in the axial direction may be different from the foregoing. With respect to this, the angles of deviation of the two or more first portions of level difference may be identical to each other or different from each other. In the stabilizer 32, in a similar manner, two or more first level difference portions may be provided within the range of a blade wheel 12A in the axial direction.

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Although, in the embodiment, parts of the main end portion of the rear rail 20 are identical to each other in shape and height in the range that opposes the five blade wheels 12A, the parts may be different from each other. For example, the number of the first portions of the level difference, the deflection angles, or the deflection directions may be different between the blade wheels 12A. In addition, the first level difference portion may be provided to oppose an intermediate portion in the axial direction of only one or more blade wheels 12a between the five blade wheels 12A. In addition, the second level difference portion may be provided to oppose only one or more connection portions between the connection portions of the six blade wheels 12. In the stabilizer 32, in a similar manner, parts opposing The five blade wheels 12A can be different from each other in shape and height.

Although in the embodiment the rear grille 20 is arranged so that the division pieces 23 and 24 are identical in height (i.e., the height of the part between adjacent level difference portions) in the axial direction, the The height of each of the division pieces 228 can be varied gradually in the axial direction such as in the case of a rear grille 220 shown in FIG. 13. The cross-sectional shape in the axial direction of each division piece 228 is substantially constant. This makes it possible to sequentially generate the wind noise generated when the blade 15 passes through a part of division 228. In FIG. 13, the level difference portions 229 on the respective sides of the division piece 228 oppose a central portion in the axial direction of the blade wheel 12A (or an end portion of the blade wheel 12) and the connection portion between the blade wheels 12, respectively. In the stabilizer 32, in a similar manner, the height of each division piece 241 can be gradually changed in the axial direction such as in the case of a stabilizer 232 of a front grille 230 shown in FIG. 14, for example. In FIG. 14, the level difference portions 242 on the respective sides of the division piece 241 oppose a central portion in the axial direction of the blade wheel 12A (or the end portion of the blade wheel 12) and the connection portion between the blade wheels 12, respectively.

Although in the previous embodiment, the part of the rear grid 20 where the shape deviates in the circumferential direction intervals from the main end to the edge between the protruding portion 22 and the curved surface 21, the deviated part of the rear grid 20 may range from the main end to an intermediate portion of the curved surface 21. In other words, the bottom edges of the division pieces 23 and 24 may be above the edge between the protruding portion 22 and the curved surface 21.

Although in the previous embodiment the whole of the stabilizer 32 in the up-down direction is of multiple steps in the circumferential direction, only a part of the stabilizer 32 on the main end side can be of multiple steps in the circumferential direction. In other words, the lower edges of the division pieces 37 and 38 may be above the lower edge of the stabilizer 32. For example, only the end face 35 and the convex portion 36 are of multiple steps in the circumferential direction, and A part of the stabilizer 32, part extending from the main end to an intermediate portion of the curved surface 33, may be in the form of multiple steps in the circumferential direction.

Although in the embodiment a form of multiple steps is formed since both the rear crane 20 and the stabilizer 32 have the first level difference portions that oppose the intermediate portions in the axial direction of the blade wheel 12A, only one of the rear grille 20 and the stabilizer 32 can have a multi-step shape including the first level difference portion that opposes the intermediate portion in the axial direction of the blade wheel 12A, while the other has no the first level difference portion (i.e., the level difference portion is not provided at all, or a multi-step form in which only the second level difference portions oppose the wheel connection portions of blade 12).

In the previous embodiment, the cross-sectional shape of the rear grille 20 in the orthogonal direction to the left-right direction is constituted by the curved arc-shaped surface 21 and the protruding portion 22 which is substantially arc-shaped in cross-section and on the curved surface 21. The cross-sectional shape of the rear grid can be different in this way. For example, the cross-sectional shape may be arranged so that a protruding portion that is substantially arc-shaped on the fan side 10 and is flat on the side that opposes the fan 10 is formed on the curved surface 21. When The cross-sectional shape of the rear grid 20 is different from the way described in the previous embodiment, at least a part of the rear grid, part that oscillates from the closest position where the rear grid 20 is closest to fan 10 to the main end, deflects in the circumferential direction (i.e. a division piece).

In the above embodiment, the cross-sectional shape of the stabilizer 32 in the orthogonal direction to the left-right direction is arranged such that the flat end face 35 and the substantially triangular convex portion 36 in cross-section is provided on the curved surface 33. The cross-sectional shape of the stabilizer may be different in this way. For example, in the cross-sectional shape, no end face 35 can be provided and the convex portion 36 can be connected to the upper edge of the curved surface 33. When the cross-sectional shape of the stabilizer 32 is different from the shape described in the previous embodiment, at least a part of the stabilizer 32, part that oscillates from the closest position where the stabilizer 32 is closest to the fan 10 to the main end, deflects in the

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circumferential direction (ie dedr, a division piece).

Although the above embodiment describes a case where the present invention is used in a wall-mounted indoor unit that is arranged to suck indoor air from an upper part of the indoor unit and blow out the air from a lower part of the indoor unit, the present invention can be applied for other purposes. For example, the present invention can be used in a floor-mounted indoor unit that is arranged to suck indoor air from a lower part of the indoor unit and blow out the air from an upper part of the indoor unit.

[Industrial Applicability]

The present invention makes it possible to further reduce wind noise.

[List of reference characters]

1 AIR CONDITIONER INTERIOR UNIT 10 TRANSVERSAL FLOW FAN 12 (12A, 12B) ALABE WHEEL 15 Alabe

20, 120, 220 REAR GUA

25, 125 PORTION OF LEVEL DIFFERENCE (SECOND PORTION OF LEVEL DIFFERENCE)

26, 126, 127 LEVEL DIFFERENCE PORTION (FIRST LEVEL DIFFERENCE PORTION)

30, 230 FRONT GUA

32, 232 STABILIZER

39 LEVEL DIFFERENCE PORTION (SECOND LEVEL DIFFERENCE PORTION)

40 PORTION OF LEVEL DIFFERENCE (FIRST PORTION OF LEVEL DIFFERENCE)

229 LEVEL DIFFERENCE PORTION (FIRST LEVEL DIFFERENCE PORTION, LEVEL DIFFERENCE PORTION)

242 LEVEL DIFFERENCE PORTION (FIRST LEVEL DIFFERENCE PORTION, LEVEL DIFFERENCE PORTION)

SECOND

SECOND

Claims (5)

one. 10 fifteen twenty 25 30 2. 3. 35 Four. 40 Four. Five fifty 5. 55 60 6. Air conditioner comprising: a transverse flow fan (10) in which blade wheels (12A, 12B) each including blades (15) aligned in a circumferential direction are aligned in an axial direction; Y a stabilizer (32, 232) and a rear grille (20, 120, 220) that are provided on respective sides of an outer periphery of the cross flow fan (10) to form an air passage, a main end portion of at least one of the stabilizer (32, 232) and the rear grille (20, 120, 220) having a multi-step shape such that it includes portions of level difference that deflect in the circumferential direction of the cross flow fan (10), and the level difference portions including at least a first level difference portion (26, 126, 127) that opposes an intermediate portion in the axial direction of a corresponding one of the blade wheels (12A, 12B) characterized by that Blades (15) of a blade wheel (12A, 12B) that opposes the first portion of level difference and of a blade wheel (12A, 12B) adjacent to this blade wheel (12A, 12B) are provided to be offset from each other a predetermined angle in the circumferential direction, and in one direction from one end to the other end in the axial direction, the direction of deviation in the circumferential direction of the first level difference portion (26, 126, 127) opposes the direction of deviation in the circumferential direction of the Blades (15) of the two adjacent blade wheels (12A, 12B). Air conditioner according to claim 1, wherein the level difference portions include a second level difference portion (25, 125) that opposes a connection portion between the blade wheels (12A, 12B) . Air conditioner according to claim 1 or 2, wherein the height of a part between two contiguous portions of the level difference is constant in the axial direction. Air conditioner according to claim 3, wherein, the level difference portions include the at least a first level difference portion (26, 126, 127) that includes one or more first level difference portions (26, 126, 127) that oppose the intermediate portion in the axial direction of each of two adjacent blade wheels (12a, 12B) and a second level difference portion (25, 125) that opposes a connection portion of the two blade wheels (12A, 12B ) adjoining, in one direction from one end to the other end in the axial direction, a direction of deviation in the circumferential direction of the first level difference portion (26, 126, 127) opposes a sense of deviation in the circumferential direction of the second portion of level difference (25, 125), and Parts of the main end portion, parts that oppose the two adjacent wing wheels (12A, 12B), are identical in shape and height. Air conditioner according to claim 3, wherein, the level difference portions include two second level difference portions (25, 125) that oppose connecting portions between the blade wheel (12) that opposes the first level difference portion (26, 126, 127) and the blade wheels (12) on the respective sides of the blade wheel (12) which opposes the first level difference portion (26, 126, 127), in one direction from one end to the other end in the axial direction, a direction of deviation in the circumferential direction of the first level difference portion (26, 126, 127) opposes a sense of deviation in the circumferential direction of the second portion of level difference (25, 125), and An angle of deviation in the circumferential direction of the second level difference portion (25, 125) is smaller than the predetermined angle. Air conditioner according to claim 5, wherein, the angle of deviation in the circumferential direction of the first level difference portion (26, 126, 127) is identical to a value calculated by dividing the predetermined angle by a result of adding 1 to the number of the first portions of level difference (26, 126, 127) within an interval in the axial direction of the blade wheel (12) that opposes the first portion of level difference, and the angle of deviation in the circumferential direction of the second level difference portion (25, 125) is identical to a total sum of the angle of deviation in the circumferential direction of the first level difference portion (26, 126, 127) within the range in the axial direction. 10