TW201910693A - Air conditioner - Google Patents

Abstract

This air conditioner comprises a turbo fan having an impeller and a fan motor, and a heat exchanger disposed downstream from the impeller. The impeller has a main plate connected to a drive shaft of the fan motor, a side plate that is disposed facing the main plate and has a suction opening formed in the center thereof, and a plurality of blades provided between the main plate and the side plate. Each of the plurality of blades has a leading edge and a trailing edge disposed further radially outward than the leading edge. A notch is formed in the trailing edge. Each of the plurality of blades has, as a pair of sides facing each other across the notch, a first side positioned on the main-plate side of the notch and a second side positioned on the side-plate side of the notch. The second side is formed so as to be convex toward the main-plate side.

Description

   Air conditioner   

The invention relates to an air conditioner including a turbo fan.

Patent Document 1 describes an air conditioner. This air conditioner has a centrifugal fan and a heat exchanger arranged around the centrifugal fan. The impeller system of the centrifugal fan includes: a hub, which is mounted on the motor shaft; a protective cover, which is arranged opposite to the hub; and a plurality of wings, which are arranged between the outer periphery of the hub and the outer periphery of the protective cover. The suction port of the centrifugal fan is formed at the center of the protective cover, and the blower port of the centrifugal fan is formed at the outer periphery of the impeller.

    【Advanced technical literature】         【Patent Literature】    

[Patent Document 1] Japanese Patent No. 3092554

In a centrifugal fan, air is drawn into the impeller from the suction port along the axis. Therefore, the air sucked into the impeller has momentum from the protective cover to the axis of the hub. Moreover, when it is a low-pressure centrifugal fan mounted on an air conditioner, the radial length of the wing body is relatively short. Therefore, the air blown out of the self-blowing outlet of the centrifugal fan has an air volume distribution in the direction of the axis centering toward the hub side.

The air blown out from the blow-off port of the centrifugal fan flows into the heat exchanger arranged around the centrifugal fan. In general, the heat exchanger is arranged in a positional relationship in the axial center direction, and is disposed more toward the protective cover side than the air outlet of the centrifugal fan. Therefore, the distribution deviation of the air volume of the air flowing into the heat exchanger becomes much larger than the distribution deviation of the air volume of the air blown out of the outlet of the centrifugal fan.

The heat exchanger becomes a resistance body to the flow of air. Therefore, when the bias of the air volume distribution flows into the heat exchanger, with the loss of dynamic pressure, the bias of the air volume distribution is alleviated. Therefore, in the air conditioner described in Patent Document 1, since the energy loss becomes large, there is a problem that the required power becomes large.

The present invention was developed to solve the above-mentioned problems, and its object is to provide an air conditioner that requires less power and is excellent in energy saving.

The air conditioner of the present invention includes: a turbo fan, having an impeller and a fan motor that drives the impeller; and a heat exchanger, which is disposed on the leeward side of the impeller; the impeller has: a main board, connected to the fan motor The drive shaft; the side plate, which is arranged opposite to the main plate, and has a suction port formed in the center; and a plurality of wing bodies are provided between the main plate and the side plate; the plurality of wing bodies have: a leading edge; and a rear The flange is arranged on the outer side than the leading edge in the radial direction of the turbo fan; a notch is formed on the trailing edge, and the plural wing systems sandwich the notch to face a pair of mutually facing sides, respectively The first side of the notch on the main board side and the second side located on the side of the notch on the side board side, the second side protruding from the main board side.

According to the present invention, it is possible to bend toward the side plate side along the flow direction of the air on the second side, so that the distribution deviation of the air volume of the air flowing into the heat exchanger can be alleviated. Therefore, it is possible to reduce the dynamic pressure loss that occurs when the air is blown out from the impeller until it flows into the heat exchanger. Therefore, an air conditioner with less required power and excellent energy saving can be obtained.

10‧‧‧ Turbofan

11‧‧‧Impeller

12‧‧‧Fan motor

12a‧‧‧Drive shaft

13‧‧‧ Motherboard

14‧‧‧Side board

15‧‧‧ Wing

16‧‧‧Suction

17‧‧‧Blowout

18‧‧‧flare

20‧‧‧ heat exchanger

20a‧‧‧Upper end

20b‧‧‧Lower end

21‧‧‧Frame

22‧‧‧Suction

23‧‧‧Blowout

30‧‧‧Lead

31‧‧‧back edge

31a‧‧‧Motherboard side end

31b‧‧‧Side end of side plate

32‧‧‧Upper end

33‧‧‧Lower end

34‧‧‧Notch

35a‧‧‧ 1st side

35b‧‧‧Second side

35a1, 35b1‧‧‧‧R

36‧‧‧Bottom

37‧‧‧First connection point

38‧‧‧ 2nd connection point

39‧‧‧Gap group

39a, 39b, 39c, 39d

40,41‧‧‧End

42‧‧‧recess

O‧‧‧Axis

P1‧‧‧1st plane

P2‧‧‧2nd plane

P3‧‧‧3rd plane

Fig. 1 is a schematic diagram showing a cross-sectional structure of an air conditioner according to Embodiment 1 of the present invention.

Fig. 2 is an enlarged view showing the configuration of the wing body 15 in the air conditioner according to Embodiment 1 of the present invention.

Fig. 3 is an enlarged view showing the configuration of the wing body 15 in the air conditioner according to Embodiment 1 of the present invention.

FIG. 4 is a diagram showing the positional relationship between the wing body 15 and the heat exchanger 20 in the air conditioner according to Embodiment 1 of the present invention.

Fig. 5 is a diagram showing a first modification of the configuration of the wing body 15 in the air conditioner according to Embodiment 1 of the present invention.

Fig. 6 is a diagram showing a second modification of the configuration of the wing body 15 in the air conditioner according to Embodiment 1 of the present invention.

Fig. 7 is a diagram showing the configuration of the wing body 15 in the air conditioner according to Embodiment 2 of the present invention.

FIG. 8 is a diagram showing the configuration of the wing body 15 in the air conditioner according to Embodiment 3 of the present invention.

Embodiment 1

The air conditioner according to Embodiment 1 of the present invention will be described. In this embodiment, the air conditioner exemplifies a four-directional blowout type ceiling cassette type indoor unit. Fig. 1 is a schematic diagram showing the cross-sectional structure of the air conditioner of this embodiment. In the first figure, the cross section of the air conditioner is cut by the meridian plane of the turbo fan 10. Here, the meridian plane refers to a plane including the axis O of the turbo fan 10. The shape of the wing body 15 shown in FIG. 1 and the following FIGS. 2 to 8 is such that one of the plurality of wing bodies 15 is rotated and projected onto the meridian plane of the turbo fan 10.

As shown in FIG. 1, the air conditioner includes: a turbo fan 10 having an impeller 11 and a fan motor 12 that drives the impeller 11; a heat exchanger 20 disposed on the leeward side of the impeller 11; and a frame 21 that houses Turbo fan 10 and heat exchanger 20. The fan motor 12 of the turbo fan 10 is fixed to the center of the top surface of the frame 21. The axis O of the turbo fan 10 extends in the vertical direction. The heat exchanger 20 is arranged so as to surround the outer periphery of the impeller 11, and when viewed in the direction of the axis O, has a generally quadrangular frame shape. The heat exchanger 20 constitutes a refrigeration cycle of a circulating refrigerant together with a compressor, an outdoor heat exchanger, and an expansion valve (not shown). The heat exchanger 20 functions as an evaporator when operating in a cold room, and functions as a condenser when operating in a warm room.

At the center of the lower surface of the casing 21, an air inlet 22 for an air conditioner that draws room air into the casing 21 is formed. In the lower surface of the casing 21, around the suction port 22, there is formed an outlet 23 of an air conditioner that allows air-conditioned air passing through the heat exchanger 20 to be blown out of the casing 21 into the room. In the four-direction ceiling-type indoor unit with a blow-out type, four air outlets 23 for blowing air-conditioning air are provided in four directions different from each other.

The impeller 11 has a main board 13 connected to the drive shaft 12 a of the fan motor 12, a side plate 14 in a ring shape and arranged opposite to the main board 13, and a plurality of wing bodies 15 provided between the main board 13 and the side plate 14. At the center of the side plate 14, a suction port 16 of the impeller 11 having a circular opening centered on the axis O is formed. The suction port 16 of the impeller 11 is arranged to face the suction port 22 of the air conditioner. Between the suction port 22 of the air conditioner and the suction port 16 of the impeller 11, a bell mouth 18 that guides indoor air sucked from the suction port 22 to the suction port 16 is provided. On the outer peripheral portion of the impeller 11, an outlet 17 of the impeller 11 is formed. The plural wing bodies 15 are centered on the axis O, and are arranged at equal intervals or unequal intervals in the circumferential direction. The plural wing bodies 1 all have the same shape. The shape of the wing body 15 will be described in detail later.

When the impeller 11 rotates with the axis O as the center by the driving force of the fan motor 12, the indoor air drawn into the housing 21 through the suction port 22 of the air conditioner is guided by the bell mouth 18 from The suction port 16 of the impeller 11 is sucked into the impeller 11. The indoor air sucked into the impeller 11 passes between the wing bodies of the two wing bodies 15 adjacent in the circumferential direction, and is blown out from the outlet port 17 of the impeller 11 to the outer peripheral side. The indoor air blown out to the outer peripheral side of the impeller 11 passes through the heat exchanger 20, is cooled or heated by heat exchange with the refrigerant, and becomes air-conditioned air. The air-conditioning air is blown out into the room from the air outlet 23 of the air conditioner.

Fig. 2 is an enlarged view showing the configuration of the wing body 15 in the air conditioner of this embodiment. The upper and lower directions in FIG. 2 indicate the axial direction along the axial center O of the turbo fan 10 and the impeller 11. The left-right direction in Fig. 2 shows the radial direction of the turbo fan 10 and the impeller 11. In the range shown in Fig. 2, the left direction represents the radial outer side, and the right direction represents the radial inner side.

As shown in FIG. 2, the wing body 15 has an upper end 32 that is joined to the lower surface of the main plate 13 and a lower end 33 that is joined to the upper surface of the side plate 14. In addition, the wing body 15 has a leading edge 30 and a trailing edge 31, which are arranged closer to the rear than the leading edge 30 in the rotation direction of the impeller 11. The trailing edge 31 is positioned radially outward of the leading edge 30 in the radial direction. The leading edge 30 and the trailing edge 31 both extend from the upper end 32 to the lower end 33. Hereinafter, the end on the upper end 32 side and the end on the lower end 33 side of the trailing edge 31 may be referred to as a main board side end 31 a and a side plate side end 31 b, respectively.

At a part of the trailing edge 31, a notch 34 having a substantially triangular shape is formed. That is, the notch 34 has a shape of a notch that is roughly triangular from the rear edge 31 to the front edge 30. The wing body 15 is a pair of sides facing each other with the notch 34 therebetween. There is a first side 35a which is located closer to the main board 13 side than the notch 34 in the axial direction, and is located in the axial direction The second side 35b closer to the side plate 14 than the notch 34 is. The range of the notch 34 is from the first connection point 37 connecting the first side 35a and the trailing edge 31 to the second connection point 38 connecting the second side 35b and the trailing edge 31.

In the notch 34, the portion located closest to the radially inner side becomes the bottom 36 of the notch 34. In the axial direction, the bottom 36 is located between the first connection point 37 and the second connection point 38. That is, the bottom 36 is located between the plane perpendicular to the axis and including the first connection point 37 and the plane perpendicular to the axis and including the second connection point 38. The first side 35a connects between the first connection point 37 and the bottom 36. The second side 35b connects between the second connection point 38 and the bottom 36. The notch 34 of this embodiment is almost triangular, so the bottom 36 is dotted.

The depth dimension D1 of the notch 34 in the radial direction is defined as the distance between the second connection point 38 in the radial direction and the bottom 36. That is, the depth dimension D1 is equal to the distance from the second connection point 38 to the axis O minus the distance between the bottom 36 and the axis O. In addition, the width dimension W1 of the notch 34 in the axis direction is defined as the distance between the first connection point 37 and the second connection point 38 in the axis direction. The depth dimension D1 is greater than the width dimension W1 (D1> W1). Also, the depth dimension D1 is greater than 1/4 of the distance between the leading edge 30 and the trailing edge 31 in the radial direction.

The second side 35b is stretched entirely and is convexly formed on the side of the main board 13 to form a smooth curve. That is, the second side 35b is formed to protrude from the notch 34. The second side 35b has, for example, a circular arc shape.

In addition, the first side 35a is stretched entirely and is convexly formed on the side of the main board 13 to form a smooth curve. That is, the first side 35a is formed to be recessed with respect to the notch 34. The first side 35a has a circular arc shape, for example.

FIG. 3 is an enlarged view showing the structure of the wing body 15 in the air conditioner of the present embodiment, similar to FIG. 2. As shown in FIG. 3, the notch 34 is formed in the trailing edge 31 and is formed close to the main board 13. Specifically, when the imaginary plane at the position between the main board side end 31a and the side board side end 31b of the rear edge 31 in the axial direction is regarded as the first plane P1, the bottom 36 of the notch 34, It is located closer to the main board 13 side than the first plane P1. Here, the first plane P1 is a plane perpendicular to the axis direction, and the distance from the main plate side end 31a and the side plate side end 31b are equal.

FIG. 4 is a diagram showing the positional relationship between the wing body 15 and the heat exchanger 20 in the air conditioner of this embodiment. As shown in FIG. 4, the heat exchanger 20 is arranged not to the main plate 13 side but to the side plate 14 side with respect to the air outlet 17 of the turbo fan 10. Specifically, when the imaginary plane located between the upper end 20a and the lower end 20b of the heat exchanger 20 in the axial direction is regarded as the second plane P2, the second plane P2 is located more than the first plane P1 It is closer to the side plate 14 side. Here, the second plane P2 is a plane perpendicular to the axis direction, and the distance from the upper end 20a is equal to the distance from the lower end 20b. The bottom 36 of the notch 34 is located closer to the main board 13 side than the first plane P1, so of course, it is located closer to the main board 13 side than the second plane P2.

When the impeller 11 rotates, the wing body 15 acts so that the air is forced out on the positive pressure surface side, and the air is pulled in on the negative pressure surface side. This effect is the same around the gap 34. The wing body surface along the positive pressure surface side or the negative pressure surface side of the wing body 15 reaches the bottom 36 of the notch 34 from the leading edge 30, and flows from the bottom 36 along the first side 35a or the second side 35b to the rear Edge 31 side.

In the turbo fan 10, air is sucked into the impeller 11 from the suction port 16 along the axial direction. Therefore, the air sucked into the impeller 11 has momentum from the side plate 14 to the main board 13 in the axial direction. Therefore, the air flowing along the wing body surface of the wing body 15 is shown from the thick arrow F1 in FIG. 2 and gradually approaches the main plate 13 while moving from the leading edge 30 to the bottom 36. However, the second side 35b is convexly provided on the side of the main board 13, so the direction of air flow from the bottom 36 to the trailing edge 31 along the second side 35b is shown by the thick arrow F2 in FIG. As it approaches the trailing edge 31, it gradually bends toward the side plate 14 side.

In addition, the first side 35a is also protrudingly provided on the side of the main board 13, so that the flow direction of the air from the bottom 36 to the trailing edge 31 along the first side 35a also gradually increases toward the trailing edge 31 The side plate 14 is bent on the side.

The air flowing between the wing bodies of two adjacent wing bodies 15 in the circumferential direction mimics the flow of air along the wing body face of the wing body 15. Therefore, the flow direction of the air on the outer peripheral side closer to the notch 34 than the bottom 36 is curved toward the side plate 14 as compared to the flow direction of the air on the inner peripheral side than the bottom 36 .

Therefore, a notch 34 is formed in the trailing edge 31 of the wing body 15, whereby the air volume distribution of the air blown out from the outlet 17 of the impeller 11 is more uniform, and the air volume distribution in the axial direction is biased toward the main plate 13 side Was eased. As a result, the deviation of the air volume distribution into the heat exchanger 20 is also alleviated. Thus, according to this embodiment, it is possible to reduce the dynamic pressure loss caused by the air blown from the blower 17 of the impeller 11 until it flows into the heat exchanger 20. Therefore, it is possible to obtain an air conditioner that requires less power and is excellent in energy saving.

Next, a modification of this embodiment will be described. Fig. 5 is a diagram showing a first modification of the configuration of the wing body 15 in the air conditioner of this embodiment. As shown in FIG. 5, a notch 34 having a substantially trapezoidal shape is formed on the rear edge 31 of the wing body 15 of this modification. The bottom 36 is formed linearly along the axis direction. The other configurations are the same as those shown in Figs. 1 to 4. In the configuration of this modification, the air along the wing body surface of the wing body 15 from the leading edge 30 to the bottom 36 of the notch 34 flows from the bottom 36 along the first side 35a or the second side 35b to the trailing edge 31 side. Therefore, with this modification, the same effects as those shown in FIGS. 1 to 4 can be obtained.

Fig. 6 is a diagram showing a second modification of the configuration of the wing body 15 in the air conditioner of this embodiment. As shown in FIG. 6, in the first side 35a, a portion adjacent to the first connection point 37 is formed with an R portion 35a1. Among the second sides 35b, a portion adjacent to the second connection point 38 is formed with an R portion 35b1. In this configuration, the range of the notch 34 is also from the first connection point 37 to the second connection point 38. The first side 35a, except for the R portion 35a1, extends substantially entirely, and is convexly curved on the main board 13 side. The second side 35b extends over the entire portion including the R portion 35b1, and is convexly curved on the main board 13 side. With this modification, the same effect as the configuration shown in FIGS. 1 to 4 can be obtained.

As described above, the air conditioner of this embodiment includes the turbo fan 10, the fan motor 12 having the impeller 11 and the driving impeller 11, and the heat exchanger 20 disposed on the leeward side of the impeller 11. The impeller 11 includes a main board 13 connected to the drive shaft 12a of the fan motor 12, a side plate 14 disposed opposite to the main board 13, and a suction port 16 formed at the center, and a plurality of wings 15 provided on the main board 13 and the side boards Between 14. Each of the plurality of wing bodies 15 has a leading edge 30 and a trailing edge 31 arranged radially outward of the leading edge 30 in the radial direction of the turbofan 10. A notch 34 is formed in the trailing edge 31. The plural wing bodies 15 have a pair of sides facing each other with the notch 34 in between: a first side 35a located on the main plate 13 side of the notch 34; and a second side 35b located on the side plate 14 side of the notch 34. The second side 35b is convexly provided on the main board 13 side.

According to this configuration, it is possible to bend toward the side plate 14 along the air flow direction of the second side 35b. Therefore, it is possible to alleviate the bias in the distribution of the amount of air flowing into the heat exchanger 20. Therefore, it is possible to reduce the loss of dynamic pressure generated by the air blown from the impeller 11 until it flows into the heat exchanger 20, so that an air conditioner with less required power and excellent energy saving can be obtained.

In the air conditioner of this embodiment, the end located on the side of the main board 13 among the ends of the rear edge 31 t is regarded as the end 31a on the side of the main board, and the end located on the side of the side board 14 among the ends of the rear edge 31 t As a side plate side end 31b, a plane perpendicular to the axial direction of the turbo fan 10, and a plane having a distance equal to the distance from the main plate side end 31a and the side plate side end 31b being the first plane P1 In the notch 34, the innermost part of the turbo fan 10 in the radial direction is regarded as the bottom 36 of the notch 34. At this time, the bottom 36 of the notch 34 is positioned closer to the main board 13 side than the first plane P1. According to this configuration, the gap 34 is formed at a position where the air volume reciprocity becomes large. Therefore, the deviation of the air volume distribution of the air flowing into the heat exchanger 20 can be effectively alleviated.

In the air conditioner of this embodiment, one end (for example, the upper end 20a) of the heat exchanger 20 in the axial direction is regarded as the first end, and the other end of the heat exchanger 20 in the axial direction (For example, the lower end 20b) as the second end, the plane perpendicular to the axis direction, and the plane with the distance from the first end equal to the distance from the second end as the second plane P2 . At this time, the second plane P2 is located closer to the side plate 14 than the first plane P1. In this configuration, the deviation of the air volume distribution of the air flowing into the heat exchanger 20 in the axial direction is much larger than that of the air volume distribution in the axial direction in the outlet 17 of the impeller 11 . Therefore, the gap 34 relaxes the bias of the air volume distribution, whereby the dynamic pressure loss caused by the air blown from the impeller 11 to flow into the heat exchanger 20 can be greatly reduced.

In the air conditioner of this embodiment, the depth dimension D1 of the notch 34 in the radial direction of the turbo fan 10 is larger than the width dimension W1 of the notch 34 in the axial direction of the turbo fan 10. According to this configuration, the radial length of the second side 35b can be sufficiently ensured, so that the direction of air flow along the second side 35b can be more reliably curved.

In the air conditioner of this embodiment, the first side 35a is convexly provided on the main board 13 side. According to this configuration, not only along the flow direction of the air on the second side 35b but also along the flow direction of the air on the first side 35a, it can also be bent toward the side plate 14 side, so that the flow into the heat exchanger 20 can be more sure The bias of the air volume distribution.

Embodiment 2

The air conditioner according to Embodiment 2 of the present invention will be described. FIG. 7 is a diagram showing the configuration of the wing body 15 in the air conditioner of this embodiment. As shown in FIG. 7, at the trailing edge 31 of the wing body 15, a notch group 39 composed of a plurality of notches 39 a, 39 b, 39 c, and 39 d juxtaposed in the axial direction is formed. Each of the notches 39a, 39b, 39c, and 39d has the same shape as the notch 34 shown in FIGS. 2 and 3. The notches 39a, 39b, 39c, 39d are arranged in order from the main plate 13 side to the side plate 14 side.

In the notch group 39, the connection point where the first side 35a of the notch 39a located closest to the main board 13 side and the rear edge 31 are connected is regarded as the end 40 of the notch group 39 on the main board 13 side. In the notch group 39, the connection point where the second side 35b of the notch 39d located closest to the side plate 14 side and the rear edge 31 are connected is regarded as the end 41 of the notch group 39 on the side plate 14 side. In addition, an imaginary plane positioned in the middle between the end 40 and the end 41 in the axial direction is regarded as the third plane P3. At this time, the third plane P3 is located closer to the main board 13 side than the first plane P1. Here, the third plane P3 is a plane perpendicular to the axis direction, and the distance from the end 40 is equal to the distance from the end 41.

As described above, in the air conditioner of the present embodiment, the rear edge 31 is formed with a plurality of notches 39a, 39b, 39c, and 39d. A plane perpendicular to the axial direction of the turbofan 10 and having a distance away from the end 31a on the main board side and a distance away from the end 31b on the side plate equal to each other is regarded as the first plane P1. The plane perpendicular to the axis direction, and the distance from the end 40 on the main plate 13 side of the notch group 39 is equal to the distance from the end 41 on the side plate 14 side of the notch group 39 as the third plane P3 . At this time, the third plane P3 is located closer to the main board 13 side than the first plane P1.

According to this configuration, the wing body 15 is formed with a notch group 39 extending in a wide range close to the main board 13 in the axial direction. Therefore, the effect of bending the air flow direction toward the side plate 14 by the notches 39a, 39b, 39c, 39d is obtained relative to the air flow passing through the wing body 15 in the axial direction in a wide range. Therefore, it is possible to effectively alleviate the distribution bias of the air volume flowing into the heat exchanger 20.

Embodiment 3

The air conditioner according to Embodiment 3 of the present invention will be described. Fig. 8 is a diagram showing the configuration of the wing body 15 in the air conditioner of this embodiment. As shown in FIG. 8, at the rear edge 31 closer to the side plate 14 than the notch 34, in order to subdivide the trailing edge to release vortices, a plurality of concave portions 42 are formed in the axial direction. As a result, the rear edge 31 closer to the side plate 14 than the notch 34 has a saw-shaped shape. The recess 42 is not formed on the rear edge 31 closer to the main board 13 side than the notch 34. That is, the concave portion 42 is formed in the trailing edge 31 and is formed only closer to the side plate 14 than the notch 34. In addition, the recess 42 is formed in the rear edge 31, and is formed in the entire area closer to the side plate 14 than the notch 34.

The depth dimension D2 of the recess 42 in the radial direction is smaller than the width dimension W2 of the recess 42 in the axial direction (D2 ≦ W2). The width dimension W2 of the concave portion 42 in the axial direction is smaller than the width dimension W1 of the notch 34 (refer to FIG. 2) (W2 <W1). In addition, the depth dimension D2 of the concave portion 42 in the radial direction is smaller than the depth dimension D1 of the notch 34 (refer to FIG. 2) (D2 <D1).

As described above, in the air conditioner of this embodiment, a plurality of recesses 42 are formed in the rear edge 31 closer to the side plate 14 than the notch 34. Each width dimension W2 of the plurality of concave portions 42 in the axial center direction of the turbo fan 10 is smaller than the width dimension W1 of the notch 34 in the axial center direction. Each depth dimension D2 of the plurality of concave portions 42 in the radial direction of the turbo fan 10 is smaller than the depth dimension D1 of the notch 34 in the radial direction.

When the air flow direction is bent toward the side plate 14 by the notch 34, the wind speed of the air closer to the side plate 14 side than the notch 34 becomes relatively faster. In the configuration of this embodiment, in the trailing edge 31, a position closer to the side plate 14 side than the notch 34, that is, a plurality of recesses 42 are formed in the portion where the air wind speed becomes relatively fast, so that The effective subdivision is released from the trailing edge 31 after the trailing edge is released. Therefore, the noise of the turbo fan 10 and the air conditioner can be reduced.

The above embodiments can be implemented in combination with each other.

Claims (7)

    An air conditioner includes: a turbo fan having an impeller and a fan motor that drives the impeller; and a heat exchanger, which is disposed on the leeward side of the impeller, the impeller is provided with: a main board, which is connected to the drive of the fan motor A shaft; a side plate, which is arranged opposite to the main plate, and a suction port is formed in a central portion; and a plurality of wings are provided between the main plate and the side plates, the plurality of wings respectively have: a leading edge; and a trailing edge, in the foregoing The radial direction of the turbo fan is arranged outside the front edge, a notch is formed on the rear edge, the plural wing systems sandwich the notch to face a pair of mutually opposed sides, and each has the main board located in the notch The first side of the side and the second side of the side plate side of the notch, the second side is convexly provided on the side of the main board.         The air conditioner as described in item 1 of the scope of the patent application, in which the end located on the main board side of the rear edge of the rear edge is regarded as the main board side end, The end of the side plate is regarded as the end of the side plate, which will be a plane perpendicular to the axial direction of the turbo fan, and the distance from the end of the main plate and the distance from the end of the side plate are the same plane, when As the first plane, when the innermost part of the gap in the radial direction of the turbo fan is regarded as the bottom of the gap, the bottom is located closer to the main board than the first plane .         The air conditioner as described in item 2 of the scope of the patent application, wherein when one end of the heat exchanger in the axial direction is regarded as the first end, the air conditioner in the axial direction The other end is regarded as the second end, and the plane perpendicular to the axis direction and the distance from the first end and the distance from the second end are equal to the plane as the second plane The second plane is located closer to the side plate than the first plane.         The air conditioner according to any one of claims 1 to 3, wherein the depth dimension of the notch in the radial direction of the turbo fan is larger than the notch in the axial direction of the turbo fan Width dimension.         The air conditioner according to any one of claims 1 to 3, wherein the first side is convexly provided on the main board side.         The air conditioner according to any one of items 1 to 3 of the patent application scope, wherein, when a gap group formed by a plurality of the gaps is formed on the trailing edge, it will be perpendicular to the axial direction of the turbo fan Plane, and the plane from the end of the main board side and the distance from the end of the side board are equal to each other, which is regarded as the first plane, the plane perpendicular to the direction of the axis, and the gap group is away from the The distance between the end of the main board and the distance from the end of the notch group to the side of the side board is equal to the plane. When the third plane is regarded as the third plane, the third plane is located closer to the main board than the first plane The position of the side.         The air conditioner according to any one of claims 1 to 3, wherein a plurality of recesses are formed in the trailing edge closer to the side plate side than the notch, the turbo fan The width dimensions of the plurality of recesses in the axial direction are smaller than the width dimension of the notches in the direction of the axis, and the depth dimensions of the plurality of recesses in the radial direction of the turbofan are smaller than those in the radial direction Depth dimension of the aforementioned notch.