JP6340585B2 - Cross flow fan - Google Patents

Description

  The present invention relates to a cross flow fan used in an air conditioner used for air conditioning in a house or the like.

  Conventionally, an air conditioner including a crossflow fan inside an indoor unit is known. In the air conditioner, friction loss occurs near the side walls that support both ends of the crossflow fan, and the air blowing speed at both ends of the crossflow fan becomes smaller than that of the other portions. For this reason, turbulence (surging) of air flow such as unstable air flow or reverse suction occurs, and an annoying abnormal sound may occur intermittently.

  As a technique for suppressing the disturbance of the air flow, for example, there is a technique described in Patent Document 1 (Japanese Patent Laid-Open No. 5-87087). FIG. 6 is a perspective view schematically showing the internal structure of the indoor unit of the air conditioner described in Patent Document 1. As shown in FIG.

  As shown in FIG. 6, the indoor unit of the air conditioner of Patent Document 1 includes a cross flow fan 5, a stabilizer 7, and a rear guider 9. Between the stabilizer 7 and the rear guider 9, a blowout port 11 for blowing out air is formed. The blowout port 11 is provided with a louver 10 that deflects the direction of air blowout air. A block 8 having a substantially fan-shaped cross section is provided at least at one end of the rear guider 9 and between the vicinity of the cross flow fan 5 and the outlet 11. The block 8 is formed so that the angle formed with the rear guider 9 becomes smaller on both the windward side surface and the leeward side surface.

  According to the air conditioner of Patent Document 1, the block 8 can suppress and rectify the disturbance of the air flow generated in the vicinity of at least one end of the cross flow fan 5, thereby suppressing annoying abnormal noise.

JP-A-5-87087

  However, in the air conditioner of Patent Document 1, the provision of the block 8 increases the ventilation resistance of the outlet 11.

  Further, in the air conditioner of Patent Document 1, air block disturbance (also referred to as turbulent vortex or three-dimensional flow) generated near both ends of the cross flow fan 5 is not sufficiently suppressed or rectified by the block 8. , It may propagate to the center of the cross flow fan 5 and the generation of an annoying abnormal sound may continue.

  An object of the present invention is to solve the above-described problems, and to provide a cross-flow fan that can suppress generation of annoying abnormal noise and has high productivity.

In order to solve the above-described conventional problems, the cross flow fan of the present invention has a configuration in which end plates provided at both ends, a first fan body, and a second fan body are connected in series. The first fan body includes a plurality of blades arranged in a ring and a support plate having an opening, and the second fan body includes a plurality of blades arranged in a ring and And a support plate that does not have an opening, and one of the support plates of the first fan body and the second fan body is provided with a groove in an outer peripheral portion.

  According to the crossflow fan concerning this invention, by having the said structure, generation | occurrence | production of an unpleasant abnormal sound can be suppressed and productivity can also be improved.

The perspective view which shows the indoor unit of the air conditioner provided with the crossflow fan concerning embodiment of this invention Schematic sectional view of the indoor unit of FIG. It is the elements on larger scale of Drawing 2, and is a figure showing the flow of air at the time of operation of a cross flow fan Perspective view showing the internal structure of the cross flow fan The front view which shows typically the state which attached the crossflow fan to the side wall with which an indoor unit main body is equipped The perspective view which shows typically the internal structure of the indoor unit of the air conditioner of patent document 1 Sectional drawing which shows the structure of the conventional crossflow fan FIG. 7 is a plan view of the shaft side assembly provided in the cross flow fan of FIG. Sectional view taken along line A1-A1 of FIG. 8A The top view of the fan body with which the cross flow fan of Drawing 7 is provided Sectional view along line A2-A2 of FIG. 9A The top view of the boss | hub side assembly with which the crossflow fan of FIG. 7 is equipped Sectional view along line A3-A3 in FIG. 10A Sectional drawing which shows an example of a structure of the crossflow fan which concerns on this Embodiment The top view of the fan body which has an opening part with which the crossflow fan of FIG. 11 is provided. A4-A4 line sectional view of Drawing 12A (A) Front view, (b) Side view of second fan body according to the present embodiment (A) AA line sectional view of FIG. 13, (b) BB line sectional view 13 is an enlarged view of the main part of FIG. The principal part enlarged view of another 2nd fan body which concerns on this Embodiment Sectional drawing which shows another example of a structure of the crossflow fan which concerns on this Embodiment Sectional drawing which shows another example of a structure of the crossflow fan which concerns on this Embodiment Sectional drawing which shows another example of a structure of the crossflow fan which concerns on this Embodiment

  The air conditioner of the present invention has a configuration in which end plates provided at both ends, a first fan body, and a second fan body are connected in series, and the first fan body includes: The second fan body includes a plurality of blades arranged in a ring and a support plate having an opening, and the second fan body includes a plurality of blades arranged in a ring and a support plate having no opening. And the support plate of any one of the first fan body and the second fan body is configured such that a groove is provided in an outer peripheral portion.

According to this configuration, since the support plate adjacent to the end plate does not have an opening, the support plate causes turbulence of the air flow generated in the vicinity of at least one end of the cross flow fan. Propagation to the side can be suppressed. Therefore, it is possible to suppress the generation of an annoying abnormal sound. Further, the fan body having the opening in the support plate and the fan body not having the opening can be clearly distinguished by the groove. For this reason, it can prevent that the order of the said assembly is mistaken when assembling them. As a result, productivity can be improved.

  In addition, it is preferable that the support plate includes a plurality of insertion grooves into which end portions of adjacent wings are inserted, and the grooves are provided between the insertion grooves. According to this structure, it can avoid that the insertion groove for inserting a wing | blade and the groove | channel of an outer peripheral part overlap, and can shape | mold easily.

  In addition, it is preferable that the number of the grooves be a divisor excluding 1 of the number of the blades. According to this configuration, it becomes easy to provide the groove between the blades.

  In addition, it is preferable that the groove is recessed in the same direction as the recessed direction of the insertion groove and is opened at the outer peripheral end of the support plate. According to this structure, it becomes easy to mold a groove or an insertion groove in the fan body. Further, the presence or absence of a groove can also be confirmed when the fan body is viewed from a plane parallel to the axial direction. As a result, it can be easily confirmed visually when the fan is assembled, and the productivity is improved.

  The first fan body and the second fan body preferably have different axial lengths. According to this configuration, a fan body having an opening in the support plate and a fan body having no opening can be clearly distinguished by the axial length.

  The axial length of the first fan body is preferably 2.7 to 3.1 times the axial length of the second fan body. According to this configuration, the fan body having the opening in the support plate and the fan body not having the opening can be clearly distinguished by classifying them into groups having different axial lengths.

  The cross flow fan includes a plurality of first fan bodies and two second fan bodies, and the plurality of first fan bodies have the same axial length, and the two second fan bodies. It is desirable that the fan bodies have different axial lengths. According to this configuration, since the support plate adjacent to the end plate does not have an opening, the support plate causes turbulence of the air flow generated in the vicinity of at least one end of the cross flow fan. Propagation to the side can be suppressed. Therefore, it is possible to suppress the generation of an annoying abnormal sound.

The second fan body is preferably adjacent to one end plate and connected to the other end plate via a plurality of blades arranged in an annular shape. According to this configuration,
The opening is preferably a circular opening centered on the rotation axis of the cross flow fan. According to this configuration, when the support plate having the opening is rotated by the rotation of the cross flow fan, it is possible to suppress the air flow from being changed by the support plate. Thereby, generation | occurrence | production of abnormal sound can be suppressed further, without exerting a bad influence on an aerodynamic characteristic.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment)
An air conditioner provided with a crossflow fan according to an embodiment of the present invention is composed of an outdoor unit and an indoor unit connected to each other through a refrigerant pipe. FIG. 1 is a perspective view showing an indoor unit of an air conditioner including a cross flow fan according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the indoor unit of FIG. 1 as viewed from the rotational axis direction of the cross flow fan.

1 and 2, the indoor unit body 21 of the air conditioner according to the present embodiment includes a frame 22 and a front cover 23 attached to the front of the frame 22. A suction grill 24 is provided on the top of the frame 22 and the front cover 23. In the indoor unit main body 21, a cross flow fan 25, a heat exchanger 26, a stabilizer 27, and a rear guider 28 are provided.

  The cross flow fan 25 is configured to be rotatable about a rotation shaft 25A. The heat exchanger 26 is disposed so as to surround the front portion and the upper portion of the cross flow fan 25. The stabilizer 27 and the rear guider 28 constitute a casing 29, and a blowout port 40 for blowing air is formed between the stabilizer 27 and the rear guider 28.

  The rear guider 28 and the cross flow fan 25 are provided in the rotational axis direction of the cross flow fan 25 (perpendicular to the paper surface of FIG. 2). As a result, the two-dimensionality is higher than that in which the positional relationship changes, such as when the two cross each other. For this reason, the aerodynamic characteristic is improved.

  The stabilizer 27 is arrange | positioned under the heat exchanger 26 so that the condensed water condensed by the heat exchanger 26 may be received. A convex portion 30 is provided at the upper end portion of the stabilizer 27. The convex portion 30 is a portion having the shortest separation distance from the cross flow fan 25 in the stabilizer 27 when the stabilizer 27 is viewed from the rotation axis direction of the cross flow fan 25. That is, the convex portion 30 is a portion that is closest to the cross flow fan 25 in the stabilizer 27. Further, the stabilizer 27 is provided with a substantially arc-shaped tongue portion 31 at a portion closest to the rear guider 28.

  FIG. 3 is an enlarged view of the vicinity of the convex portion 30 and is a view showing the air flow when the cross flow fan 25 is in operation. As shown in FIG. 3, when the cross flow fan 25 rotates about the rotation shaft 25 </ b> A (rotates clockwise in FIG. 3), the convex portion 30 moves to the suction side (upstream side) and the blowout side ( The vortex A is formed inside the cross flow fan 25.

  Here, when turbulence (surging) of the air flow has not occurred (hereinafter referred to as normal time), the air flow flows from the tongue portion 31 to the convex portion 30, and the tongue portion 31 and the convex portion 30 The air flow never enters or exits the cross flow fan 25 from between. Therefore, the vortex A is present at the position shown in FIG.

  However, when air flow turbulence (surging) occurs (hereinafter referred to as surging), the air flow enters and exits the cross flow fan 25 from between the tongue portion 31 and the convex portion 30. A change occurs in the size and position of the vortex A.

  FIG. 4 is a perspective view showing the internal structure of the cross flow fan 25. FIG. 5 is a front view schematically showing a state in which the cross flow fan 25 is attached to the side wall 33 provided in the indoor unit main body 21.

  As shown in FIGS. 4 and 5, the cross flow fan 25 has a configuration in which end plates 25f provided at both ends and a plurality of fan bodies 25c are connected in series. The fan body 25c has a configuration in which a support plate 25a is attached to at least one end of an impeller 25b having a plurality of blades arranged in an annular shape. In the present embodiment, the outer shape of the support plate 25a and the end plate 25f is circular. The plurality of blades of the impeller 25b extend in the direction of the rotation axis of the cross flow fan 25 and are attached to the outer peripheral portion of the support plate 25a or the end plate 25f. The fan body 25c is preferably formed by injection molding with the support plate 25a and the impeller 25b being integrated.

  As shown in FIG. 5, both end portions of the cross flow fan 25 are rotatably supported by the side wall 33 of the indoor unit body 21. A motor 32 for rotating the cross flow fan 25 is attached to one end of the cross flow fan 25 (the right end in FIG. 5).

  Under normal conditions, a substantially two-dimensional flow is formed inside the cross flow fan 25. On the other hand, when surging occurs, the two-dimensional flow in the vicinity of both ends of the crossflow fan 25 breaks down and a three-dimensional flow is generated. The three-dimensional flow generated in the vicinity of both ends of the cross flow fan 25 propagates to the center side of the cross flow fan 25, and as a result, the three-dimensional flow is also generated at a location different from the vicinity of both ends of the cross flow fan 25. It is formed. This three-dimensional flow can cause annoying abnormal sounds.

  Therefore, in the present embodiment, the support plate 25a1 positioned at the connecting portion between the fan body 25c positioned at both ends of the cross flow fan 25 and the fan body 25c adjacent to the fan body 25c at both ends has the opening 25e. On the other hand, the support plate 25a2 other than the support plate 25a1 is configured to have an opening 25e. In other words, the support plate 25a1 adjacent to the end plates 25f located at both ends of the cross flow fan 25 via the impeller 25b does not have the opening 25e, while the support plates 25a2 other than the support plate 25a1 have openings. 25e.

  According to this configuration, since the support plate 25a1 does not have the opening 25e, the three-dimensional flow generated in the vicinity of both ends of the crossflow fan 25 is propagated to the central portion side of the crossflow fan 25 by the support plate 25a1. This can be suppressed. Therefore, it is possible to suppress the generation of an annoying abnormal sound.

  Moreover, according to the said structure, since it is not necessary to provide a block in a blower outlet like the air conditioner of patent document 1, it can also avoid that the ventilation resistance of the blower outlet 40 increases. Further, by providing the opening 25e in the support plate 25a, material consumption required for manufacturing the cross flow fan 25 can be reduced, and the cross flow fan 25 can be manufactured at low cost.

  In this embodiment, two support plates 25a1 that do not have openings 25e are provided. However, the present invention is not limited to this, and only one support plate 25a1 that does not have openings 25e is provided. Also good. Even in this case, the three-dimensional flow generated in the vicinity of one end of the crossflow fan 25 can be prevented from propagating to the central portion side of the crossflow fan 25. Increase in resistance and generation of annoying abnormal noise can be suppressed. In this case, it is desirable to provide the support plate 25a1 on the end plate 25f side to which the motor 32 is connected. On the side to which the motor 32 is connected, the air flow is likely to be disturbed due to the presence of the motor 32 and a power supply unit (not shown) electrically connected to the motor 32. However, by providing the support plate 25a1, it is possible to suppress the three-dimensional flow from propagating to the central portion side of the cross flow fan 25, and to suppress the generation of an annoying abnormal sound.

Further, three or more support plates 25a1 that do not have the opening 25e may be provided. For example, the support plate 25a2 adjacent to the support plate 25a1 shown in FIG. 4 may be replaced with a support plate 25a1 that does not have the opening 25e. In this case, it is possible to further suppress the three-dimensional flow generated in the vicinity of both end portions of the cross flow fan 25 from propagating to the central portion side of the cross flow fan 25. However, if the number of support plates 25a1 that do not have the opening 25e increases, the frictional resistance due to the support plates 25a1 cannot be ignored, and the aerodynamic characteristics may be deteriorated. In particular, if the support plate 25a1 that does not have the opening 25e is disposed in the vicinity of the center of the cross flow fan 25, there is a possibility that the aerodynamic characteristics may be adversely affected. For this reason, as in the present embodiment, it is most preferable to provide the support plates 25a1 that do not have the opening 25e only at two locations on the both ends of the cross flow fan 25.

  The opening 25e is preferably a circular opening centered on the rotation shaft 25A of the cross flow fan 25. According to this configuration, when the support plate 25a2 is rotated by the rotation of the cross flow fan 25, it is possible to suppress the air flow from being changed by the support plate 25a2. Thereby, generation | occurrence | production of abnormal sound can be suppressed further, without exerting a bad influence on an aerodynamic characteristic. Therefore, it is possible to provide an air conditioner that is quieter and has high aerodynamic characteristics.

  It should be noted that the disturbance of the air flow that causes an annoying abnormal sound is likely to occur in the range of less than 5% of the entire length of the cross flow fan 25 from both ends of the cross flow fan 25. For this reason, it is preferable that the support plate 25a1 not having the opening 25e is provided at a position separated from at least one end of the crossflow fan 25 by 5% or more of the entire length of the crossflow fan 25.

  According to this configuration, the support plate 25a1 can more effectively suppress the turbulence of the air flow generated in the vicinity of at least one end of the cross flow fan 25 from propagating toward the center of the cross flow fan 25. it can. Therefore, it is possible to further suppress generation of annoying abnormal sounds.

  A motor 32 for rotating the cross flow fan 25 is attached to one end of the cross flow fan 25. The motor 32 is fixed by a fixing member such as a screw after a rotation shaft is inserted into a boss (not shown) of the cross flow fan 25, for example. In this case, in order to provide the boss and the fixing member, it is necessary to delete at least one blade of the impeller 25b of the fan body 25c located at one end of the cross flow fan 25. If the blades are lost, the turbulence of the air flow generated at one end of the cross flow fan 25 increases. For this reason, it is preferable that the support plate 25a1 not having the opening 25e is provided at a position away from at least one end of the cross flow fan 25 by 10% or more of the entire length of the cross flow fan 25.

  According to this configuration, the support plate 25a1 can more effectively suppress the turbulence of the air flow generated in the vicinity of at least one end of the cross flow fan 25 from propagating toward the center of the cross flow fan 25. it can. Therefore, it is possible to further suppress generation of annoying abnormal sounds.

  Next, the configuration of a conventional general cross flow fan 35 will be described with reference to FIGS. FIG. 7 is a cross-sectional view showing a configuration of a conventional cross flow fan 35. 8A to 10B are plan views or cross-sectional views of components constituting the conventional cross flow fan 35.

  As shown in FIG. 7, the conventional crossflow fan 35 includes a shaft side assembly 35a, a plurality of fan bodies 35b, and a boss side assembly 35c.

  As shown in FIGS. 8A and 8B, the shaft-side assembly 35a is provided with a circular end plate 35a1 and a rotary shaft that is erected at the center of one surface of the end plate 35a1 and serves as the rotary shaft of the crossflow fan 35 35a2.

  As shown in FIGS. 9A and 9B, the fan body 35b includes a circular support plate 35b1 and a plurality of blades (blades) 35b2 erected on the outer peripheral portion of one surface of the support plate 35b1. .

  As shown in FIGS. 10A and 10B, the boss-side assembly 35c includes a circular end plate 35c1, a plurality of blades (blades) 35c2 erected on the outer peripheral portion of one surface of the end plate 35c1, and an end. A boss 35c3 is provided which is erected at the center of the other surface of the plate 35c1 and to which the shaft of the motor 32 is attached.

  The shaft-side assembly 35a and the boss-side assembly 35c are provided with insertion grooves (not shown) for inserting the blades 35b2 or 35c2. The cross flow fan 35 is assembled by inserting the end of the blade 35b2 into the insertion groove of the shaft-side assembly 35a and inserting the end of the blade 35b2 or 35c2 into the insertion groove of the fan body 35b. It is carried out by welding with sound waves.

  Next, an example of the configuration of the cross flow fan 45 according to the present embodiment will be described with reference to FIGS. FIG. 11 is a cross-sectional view showing an example of the configuration of the cross flow fan 45 according to the present embodiment. FIG. 12A is a plan view of a fan body 45b constituting a part of the cross flow fan 45 according to the present embodiment, and FIG. 12B is a cross-sectional view of the fan body 45b.

  The cross flow fan 45 according to the present embodiment is different from the conventional cross flow fan 35 in that, as shown in FIG. 11, a plurality of fan bodies 35b arranged on the center side are replaced with fan bodies 45b. Is a point. The difference between the fan body 45b and the fan body 35b is that an opening is provided at the center of the circular support plate 35b1, as shown in FIGS. 12A and 12B. That is, in the cross flow fan 45 according to the present embodiment, a fan body (hereinafter referred to as a first fan body) 45b having an opening is used in the vicinity of the center, and no opening is provided at both ends. A fan body (hereinafter referred to as a second fan body) 35b is used.

  According to this configuration, since the support plate 35b1 of the second fan body 35b does not have an opening, the three-dimensional flow generated in the vicinity of both ends of the crossflow fan 45 is caused by the support plate 35b1. Propagation to the center side can be suppressed. Therefore, it is possible to suppress the generation of an annoying abnormal sound. Further, since the support plate 45b1 of the first fan body 45b in the vicinity of the center portion of the cross flow fan 45 has an opening, it is possible to increase the air volume at the center portion of the cross flow fan 45 and improve the blowing performance. it can.

  FIG. 13A is a front view of the second fan body 35b, and FIG. 13B is a side view of the second fan body 35b. 14A is a cross-sectional view of the second fan body 35b taken along line AA in FIG. 13A, and FIG. 14A is a cross-sectional view of the second fan body 35b in FIG. 13A. FIG. FIG. 15A is an enlarged front view of the main part of the second fan body 35b, and FIG. 15B is an enlarged side view of the main part of the second fan body 35b.

  The first fan body 45b and the second fan body 35b are provided with an insertion groove 60 for inserting the blades 35b2 or 35c2 of the adjacent fan body or boss side assembly. The cross flow fan 45 is assembled by inserting the end of the blade 35b2 into the insertion groove of the shaft-side assembly 35a, and the blade 35b2 or 35c2 in the insertion groove 60 of the first fan body 45b or the second fan body 35b. After inserting the end portion, the insertion portion is welded by ultrasonic waves or the like.

Moreover, as shown in FIGS. 13-15, the 2nd fan body 35b is provided with the groove | channel 50 in the outer peripheral part of the support plate 35b1. The grooves 50 are provided at equal intervals (equal pitch) on the outer peripheral portion of the support plate 35b1. For example, as shown in FIG. 13B and FIG. 14B, it is provided every 72 °. The groove 50 is provided so as to be positioned between the plurality of insertion grooves 60. Groove 50
Is a groove formed by cutting out the outer peripheral portion of the support plate 35b1 of the second fan body 35b.

  The groove 50 is a groove that is recessed from the outer peripheral portion (arc) of the support plate 35b1 in the axial (center) direction of the support plate 35b1. The groove 50 opens at the outer peripheral surface and one side surface of the support plate 35b1. The shape of the groove 50 is a substantially rectangular parallelepiped having a circular shape on one side. The groove 50 is recessed in the same direction as the insertion groove for inserting the wing.

  Further, the number of grooves 50 is a number that is a divisor of the number of blades (excluding 1). By using such a number, all the grooves 50 can be provided between the blades. For example, as shown in FIG. 13B and FIG. 14B, the number of blades is 35 and the number of grooves 50 is five. That is, the number of grooves 50 is a divisor of 35 blades. Further, if the number of the grooves 50 is three or more, it is desirable that one is surely visible even when the fan body is viewed from the front (surface parallel to the axial direction of the fan body). Furthermore, if the number of the grooves 50 is 1/7 or less of the number of blades, the grooves 50 can be generally provided between the blades even if the blade arrangement is a random pitch. In this way, by providing the groove 50 between the blades, it is possible to avoid duplication with the insertion groove 60 for inserting the blade, and it is possible to easily mold the blade.

  By providing the groove 50 in the second fan body 35b and not providing the groove 50 in the first fan body 45b, the second fan body 35b and the first fan body 45b can be clearly distinguished. . For this reason, it can prevent that the order of the said assembly is mistaken when assembling them. As a result, productivity can be improved.

  In particular, as shown in FIG. 15, by providing the groove 50 so as to be recessed in the same direction as the insertion groove 60, it becomes easy to mold the groove 50 and the insertion groove 60 in the fan body. Further, since the groove 50 is opened on the outer peripheral surface of the support plate 35b1, the presence or absence of the groove 50 can be confirmed even when the fan body is viewed from the front (surface parallel to the axial direction of the fan body). As a result, it can be easily confirmed visually when the fan is assembled, and the productivity is improved.

  In the present embodiment, it has been described that the groove 50 is provided in the second fan body 35b and not in the first fan body 45b. However, the groove 50 is provided in the first fan body 45b and is provided in the second fan body 45b. It is good also as what is not provided in 35b. That is, it may be provided on either the first fan body 45b or the second fan body 35b.

  Next, a modification of the groove 50 will be described with reference to FIG. FIG. 16A is an enlarged front view of a main part in a modification of the second fan body 35b, and FIG. 16B is an enlarged side view of the main part in a modification of the second fan body 35b. The groove 50 shown in FIG. 15 has a constant groove width W0 in the radial direction of the support plate 35b1, whereas the groove 51 shown in FIG. 16 has a groove width W1 in the radial direction of the support plate 35b1. It becomes large as it goes to the outer periphery of 35b1. For this reason, when assembling the fan, it can be more easily visually confirmed, and the productivity is improved. Further, since the width W1 of the groove 51 is smaller toward the center side of the support plate 35b1 closer to the insertion groove 60, a sufficient space can be ensured between the insertion groove 60 for inserting the wing, and molding is easily performed. be able to.

  Next, another example of the configuration of the crossflow fan according to the present embodiment will be described with reference to FIGS. FIGS. 17-19 is sectional drawing for demonstrating the axial direction length of the fan body of the crossflow fan based on this Embodiment, or the pitch of a support plate.

In the cross flow fan shown in FIG. 17, the second fan body 35b having an axial length L1 is arranged first from the left and second from the right. That is, the two second fan bodies 3
5b has the same axial length, and one is adjacent to the shaft side assembly 35a and the other is adjacent to the boss side assembly 35c. A plurality of first fan bodies 45b having an axial length L2 are arranged between the two second fan bodies 35b.

  Thus, by making the axial length different between the first fan body 45b and the second fan body 35b, that is, by changing the axial length depending on the presence or absence of the opening of the support plate of the fan body, The fan body can be easily identified and assembled to improve productivity. Further, by changing the axial length of the fan body, the randomness of the noise generated from the cross flow fan becomes remarkable, and the NZ sound depending on the rotating sound or the number of blades and the rotating speed is alleviated.

  Still another configuration will be described. In the cross flow fan shown in FIG. 18, the second fan body 35b having the axial length L1 is arranged first from the left, and the second fan body 35d having the axial length L2 is arranged from the right. Arranged second. That is, the second fan body 35b having the axial length L1 is disposed adjacent to the shaft-side assembly 35a, and the second fan body 35d having the axial length L3 is disposed adjacent to the boss-side assembly 35c. Yes. A plurality of first fan bodies 45b having an axial length L2 are arranged between the second fan body 35b and the second fan body 35d. L3 is closer to L1 than L2.

  In this way, the axial lengths of the first fan body 45b and the second fan bodies 35b and 35d are made different, that is, the axial length is changed depending on the presence or absence of the opening of the support plate of the fan body. This facilitates the identification and assembly of the fan body and improves the productivity. Note that L1 and L3 have approximately the same length, and even if confused, support plates that do not have openings are arranged on the left and right sides of the crossflow fan, and there is no major problem. In addition, by adjusting the axial lengths of the second fan body 35b and the second fan body 35d in this way, the overall length of the cross flow fan can be easily adjusted. Furthermore, by changing the axial length of the fan body, the randomness of the noise generated from the cross flow fan becomes more prominent, and the NZ sound depending on the rotational sound or the number of blades and the rotational speed is further alleviated.

Still another configuration will be described. In FIG. 19, the second fan body 35b having an axial length L1 is arranged first from the left, and the second fan body 35e having an axial length L7 is arranged second from the right. Yes. That is, the second fan body 35b having the axial length L1 is disposed adjacent to the shaft-side assembly 35a, and the second fan body 35e having the axial length L7 is disposed adjacent to the boss-side assembly 35c. Yes. The first fan bodies 45b to 45d having axial lengths L2 to L6 are arranged between the second fan body 35b and the second fan body 35e. The axial lengths L1 to L7 are set so that they can be classified into two types of groups: long objects and short objects. For example, it sets so that it can be classified as follows.
20mm <L1, L7 <22mm
60mm <L2, L3, L4, L5, L6 <62mm
That is, L2 to L6 are set sufficiently longer than L1 and L7, and are desirably 2.7 to 3.1 times.

  With such a configuration, since the arrangement of the presence or absence of the opening of the support plate can be easily identified, productivity is improved. In addition, the overall length of the cross flow fan can be adjusted more easily. Furthermore, by changing the length of the fan body, the randomness of noise generated from the cross flow fan becomes more prominent, and the NZ sound depending on the rotating sound or the number of blades and the rotating speed is further alleviated.

  As described above, the air conditioner according to the present invention can suppress generation of annoying abnormal noise without increasing the ventilation resistance of the air outlet, so that it can be used not only for a wall-mounted type but also for various air conditioners. Applicable to.

  While the invention has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art. Such changes and modifications are to be understood as being included therein, so long as they do not depart from the scope of the present invention according to the appended claims.

DESCRIPTION OF SYMBOLS 21 Indoor unit body 22 Base frame 23 Front cover 24 Suction grill 25, 45 Cross flow fan 25A Rotating shaft 25a, 25a1, 25a2, 35b1, 45b1 Support plate 25b Impeller 25c Fan body 25e Opening portion 25f End plate 26 Heat exchanger 27 Stabilizer 28 Rear guider 29 Casing 30 Convex part 31 Tongue part 32 Motor 33 Side wall 35a Shaft side assembly 35b, 35d, 35e Second fan body 35c Boss side assembly 40 Outlet 45b, 45c, 45d, 45e, 45f First Fan body 50, 51 groove 60 insertion groove

Claims (9)

A configuration in which a shaft-side assembly provided at one end of both end portions , a boss-side assembly provided at the other end of the both end portions, a first fan body, and a second fan body are connected in series. The shaft-side assembly includes a shaft-side end plate, and the boss-side assembly includes a boss-side end plate and a plurality of blades that are annularly installed on one surface of the boss-side end plate. with the door, the first fan body includes a support plate having an opening, and a plurality of blades disposed annularly on one supporting plate with the opening, the second fan body A support plate that does not have an opening, and a plurality of blades that are annularly installed on one of the support plates that do not have an opening , and one second fan body includes the shaft-side assembly and the boss The configuration adjacent to one of the side assemblies or the two second fan bodies are the shaft side assembly and the boss. A cross-flow fan having a configuration adjacent to each of the side assemblies, wherein the support plate of one of the first fan body and the second fan body is provided with a groove in an outer peripheral portion.   The cross flow fan according to claim 1, wherein the support plate includes a plurality of insertion grooves into which end portions of adjacent blades are inserted, and the grooves are provided between the insertion grooves.   3. The crossflow fan according to claim 1, wherein the groove is provided in a number that is a divisor excluding 1 of the number of the blades. 4.   The cross flow fan according to any one of claims 2 to 3, wherein the groove is recessed in the same direction as the recessed direction of the insertion groove and opens at an outer peripheral end of the support plate.   The crossflow fan according to any one of claims 1 to 4, wherein the first fan body and the second fan body have different axial lengths.   The crossflow fan according to claim 5, wherein an axial length of the first fan body is 2.7 to 3.1 times an axial length of the second fan body.   The crossflow fan includes a plurality of first fan bodies and two second fan bodies, and the plurality of first fan bodies have the same axial length, and the two second fan bodies The crossflow fan according to any one of claims 1 to 6, wherein the bodies have different axial lengths.   The second fan body according to any one of claims 1 to 7, wherein the second fan body is adjacent to one end plate and connected to the other end plate via a plurality of blades arranged in an annular shape. The described cross flow fan.   The crossflow fan according to any one of claims 1 to 8, wherein the opening is a circular opening having a rotation axis of the crossflow fan as a center.