JP5664809B2 - Cross flow fan - Google Patents

Description

  The present invention relates to a crossflow fan, and more particularly to a crossflow fan having resin blades.

  In a cross flow fan used in an indoor unit of an air conditioner, a plurality of blades extending in the longitudinal direction are disposed between two disc-shaped or annular support plates disposed at both ends in the longitudinal direction. Then, as described in Patent Document 1 (Japanese Patent Laid-Open No. 05-87086) and the like, a disk-shaped or annular intermediate plate is disposed between the two support plates in order to reinforce the strength of the plurality of blades. There is a case.

  By the way, it is described in Patent Document 1 that if a large number of support plates are provided, a plurality of support plates cause a windage loss, resulting in an increase in flow path loss. However, if the number of support plates is reduced in order to reduce the flow path loss due to the support plates, the strength of the cross flow fan will be reduced.

  An object of the present invention is to reduce flow path loss that occurs in a support plate or the like without reducing the strength of a cross flow fan.

  A cross-flow fan according to a first aspect of the present invention includes a disc-shaped or annular support plate, a plurality of blades extending in the longitudinal direction from the support plate, and a plurality of blades positioned at intermediate portions in the longitudinal direction of the plurality of blades. Auxiliary having a ring portion formed continuously in an annular shape outside the outer end of the blade, and a plurality of connection portions extending from the ring portion to adjacent blades of the plurality of blades and joined to the blades between the adjacent blades A ring.

  Further, the auxiliary ring is formed integrally with a plurality of blades using thermoplastic resin as a main material, and the support plate is made of thermoplastic resin as a main material and has an outer periphery outside the outer ends of the plurality of blades. It is molded integrally with the blades.

Furthermore, the auxiliary ring is formed in a substantially triangular shape in which a plurality of connecting portions protrude inward from the ring portion, and one side of the substantially triangular connecting portion is joined to the suction surface of the blade .

  According to the crossflow fan according to the first aspect, the auxiliary ring is annularly connected at the intermediate portion in the longitudinal direction of the plurality of blades while suppressing the flow path pressure loss by joining the blades at the connection portion extending only between the adjacent blades. The continuously formed ring part bundles the plurality of blades, whereby the strength of the fan block including the support plate and the plurality of blades is reinforced.

Further, by forming the auxiliary ring integrally with the plurality of blades, assembly of the auxiliary ring and the plurality of blades becomes unnecessary .

Further, since the pressure side of the blade are joined connection portions to the suction surface of the blade is not used for connection, Ru can reduce the connection portions existing pressure side of the blade. Since one side of the substantially triangular connecting portion is joined to the suction surface of the blade, the joining portion can be increased, while the area of the connecting portion on the pressure surface side of the other blade is reduced, so that the flow increased by the connecting portion. Road loss can be kept low.

The crossflow fan according to a second aspect of the present invention is the crossflow fan according to the first aspect, wherein the auxiliary ring is such that the length of the portion where the connecting portion is joined to the suction surface of the blade is the chord length of the blade. Less than half.

According to the cross-flow fan according to the second aspect, the length of the portion where the connecting portion is joined to the negative pressure surface of the blade because it is less than half of the chord length, reduce the area of connection portions occupied between adjacent vanes The wing surface effective area can be increased. In order to suppress the deflection of the blades due to centrifugal force or external force during fan rotation, it is sufficient that the outer peripheral side is supported by an auxiliary ring from half the chord length.

A crossflow fan according to a third aspect of the present invention is the crossflow fan according to the first aspect or the second aspect . In the auxiliary ring, the ring portion has an annular shape, and the inner periphery radius of the ring portion is a crossflow fan. It is equal to or greater than the distance from the central axis of the fan to the outer edge of the blade.

According to the crossflow fan according to the third aspect, the radius of the inner periphery of the ring portion is equal to or greater than the distance from the central axis to the outer end of the blade, so that the central axis is more than the inner periphery of the ring portion. The air flow on the side is not obstructed by the ring portion, and the flow path loss is easily suppressed.

In the crossflow fan according to the fourth aspect of the present invention, in the crossflow fan according to any one of the first aspect to the third aspect , the auxiliary ring becomes thinner as the thickness of the ring portion goes from the inner peripheral side to the outer peripheral side. Yes.

According to the crossflow fan concerning the 4th viewpoint, since the thickness of a ring part becomes thin as it goes to an outer peripheral side, the fluid loss of the air in an auxiliary ring can be reduced.

  In the crossflow fan according to the first aspect of the present invention, since the fan block of the crossflow fan is reinforced by the auxiliary ring, the blades can be lengthened without reducing the strength of the crossflow fan, the intermediate plate, etc. Thus, it is possible to reduce the flow path loss that has conventionally occurred and to reduce the flow path loss of the cross flow fan.

  Further, the assembly of the auxiliary ring and the plurality of blades becomes unnecessary, and the cost can be reduced.

Further, by eliminating the connecting portion on the pressure surface side of the blade, the effective blade on the pressure surface can be increased, the air blowing performance can be improved, and the effect of suppressing the flow path loss can be enhanced.

Further, the structure in which one side of the triangular connecting portion is joined to the suction surface of the blade can simultaneously improve the effects of reducing the flow path loss and preventing the strength of the cross flow fan from being reduced.

In the crossflow fan according to the second aspect of the present invention, it is possible to efficiently reinforce the blades and reduce the area occupied by the connecting portion between the adjacent blades, thereby suppressing the flow path loss.

In the crossflow fan according to the third aspect of the present invention, by increasing the distance from the inner periphery to the outer periphery of the ring portion (the width of the ring portion), the strength of the auxiliary ring is increased while suppressing an increase in flow path loss. Can do.

In the crossflow fan according to the fourth aspect of the present invention, the air loss can be reduced and the air blowing characteristics can be improved.

Sectional drawing which shows the outline | summary of the indoor unit of an air conditioning apparatus. The perspective view which shows the outline | summary of the impeller of the crossflow fan which concerns on one Embodiment. The perspective view for demonstrating one process of the assembly of the impeller of a crossflow fan. The top view which shows an example of a structure of the end plate of an impeller. The perspective view which shows an example of a structure of the fan block of an impeller. The side view which shows an example of a structure of the fan block of an impeller. The top view which shows an example of a structure of the support plate of a fan block. Sectional drawing which shows an example of a structure of the auxiliary ring of a fan block. FIG. 6 is a partially enlarged plan view for explaining the configuration of the fan block shown in FIG. 5. FIG. 7 is a partially enlarged side view for explaining the configuration of the fan block shown in FIG. 6. The perspective view which shows the structure of the other fan block compared with the fan block of FIG.

  Hereinafter, a crossflow fan according to an embodiment of the present invention will be described taking a crossflow fan installed in an indoor unit of an air conditioner as an example.

(1) Cross-flow fan in indoor unit Fig. 1 is a diagram schematically showing a cross section of an indoor unit 1 of an air conditioner. The indoor unit 1 includes a main body casing 2, an air filter 3, an indoor heat exchanger 4, a cross flow fan 10, a vertical flap 5, and a horizontal flap 6. As shown in FIG. 1, an air filter 3 is disposed on the top surface of the main body casing 2 on the top side downstream of the suction port 2 a so as to face the suction port 2 a. An indoor heat exchanger 4 is disposed further downstream of the air filter 3. All of the room air that passes through the suction port 2a and reaches the indoor heat exchanger 4 passes through the air filter 3 to remove dust.

  The indoor heat exchanger 4 is configured by connecting a front side heat exchanger 4a and a back side heat exchanger 4b so as to form an inverted V shape in a side view. When viewed from the top surface of the main casing 2, the front-side heat exchanger 4 a is disposed at a position substantially opposite to the front half of the suction port 2 a, and the rear-side heat exchanger 4 b is substantially opposite to the rear half. Is arranged. Both the front side heat exchanger 4a and the back side heat exchanger 4b are configured by arranging a large number of plate fins parallel to the width direction of the indoor unit 1 and attaching them to the heat transfer tubes. When the indoor air sucked from the suction port 2a and passed through the air filter 3 passes between the plate fins of the front side heat exchanger 4a and the back side heat exchanger 4b, heat exchange occurs and air conditioning is performed.

  On the downstream side of the indoor heat exchanger 4, a substantially cylindrical cross flow fan 10 extends long along the width direction of the main body casing 2, and is provided in parallel with the width direction of the main body casing 2 together with the indoor heat exchanger 4. Yes. The cross flow fan 10 includes an impeller 20 disposed in a space surrounded by an inverted V-shaped indoor heat exchanger 4 and a fan motor (not shown) for driving the impeller 20. ). The cross flow fan 10 rotates the impeller 20 in a direction A1 (clockwise) indicated by an arrow in FIG. 1 to generate an air flow.

  The blowout passage connected to the blowout port 2b downstream of the cross flow fan 10 is configured with a scroll member 2c on the back side. The scroll member 2c has substantially the same width as the opening of the air outlet 2b of the main casing 2 in a front view. The upper end of the scroll member 2c is located above the upper end of the cross flow fan 10, and is located at a position shifted to the back side from the central axis of the cylindrical cross flow fan 10 in a side view. The lower end of the scroll member 2c is connected to the open end of the air outlet 2b. The guide surface of the scroll member 2c has a smooth curved shape having a center of curvature on the side of the crossflow fan 10 in a cross-sectional view in order to smoothly and quietly guide the air blown from the crossflow fan 10 to the outlet 2b. Presents.

(2) Schematic Structure of Impeller of Crossflow Fan FIG. 2 shows a schematic structure of the impeller 20 of the crossflow fan 10. The impeller 20 is configured, for example, by joining an end plate 21 and four fan blocks 30. An end plate 21 is disposed at one end of the impeller 20, and has a metal rotation shaft 22 on the axis O. And the fan block 30 arrange | positioned at the other end of the impeller 20 is normally provided with the boss | hub part (not shown) connected with a fan motor shaft (not shown) in the center part. Or the fan block 30 arrange | positioned at the other end of the impeller 20 may have other structures, such as having a member couple | bonded with a part of fan motor, and having a metal shaft in a center part. is there. The rotating shaft 22 of the end plate 21 and the boss (or metal shaft) of the fan block 30 at the other end of the impeller 20 are supported, and the impeller 20 rotates around the axis O. The end plate 21 is the same as the conventional one. However, in order to apply the present invention, the structure of the end plate 21 does not have to be the same as the conventional one, and the structure of the end plate 21 can be changed as appropriate.

  Each fan block 30 includes a plurality of blades 40, an annular support plate 50, and an auxiliary ring 60. In assembling the impeller 20, each fan block 30 has its own plurality of blades 40 welded to the support plate 50 or the end plate 21 of the adjacent fan block 30. FIG. 3 shows a process in which two adjacent fan blocks 30 are welded. Two fan blocks 30 are stacked and installed on the jig 103. The overlapped fan block 30 is sandwiched between the jig 103 and the horn 102. Ultrasonic waves are supplied from the vibrator 101 to the horn 102, and the supplied ultrasonic waves are transmitted to the fan block 30 through the horn 102. Thereby, the blade | wing 40 of one fan block 30 and the support plate 50 of the other fan block 30 are welded by an ultrasonic wave. Similarly, the fan block 30 and the end plate 21 are sandwiched between other jigs and the horn 102, and the blade 40 and the end plate 21 of the fan block 30 are connected by supplying ultrasonic waves to the horn 102 from the vibrator 101. Weld. In order to position the blades 40 on the end plate 21 during such welding, the same number of recesses 23 as the blades 40 are formed in the end plate 21 as shown in FIG. Since each recess 23 has a planar shape slightly larger than the cross-sectional shape of each blade 40, each blade 40 is fitted and fitted into each recess 23. In order to position the end plate 21 and the fan block 30 in only one of the plurality of recesses 23, there is one in which a step portion 23a is formed.

(3) Detailed Configuration of Fan Block The detailed configuration of the fan block 30 according to the present embodiment is shown in FIGS. FIG. 5 is a perspective view showing one of the plurality of fan blocks 30 constituting the impeller 20 shown in FIG. 2, and FIG. 6 is a side view of the fan block 30. The fan block 30 shown in FIGS. 5 and 6 includes a plurality of blades 40, a support plate 50, and an auxiliary ring 60 that are integrally molded by injection molding or the like using a thermoplastic resin as a main material. The rotation direction of the fan block 30 is a direction A1 indicated by an arrow in FIG.

(3-1) Blades The plurality of blades 40 extend from the first surface 50a of the annular support plate 50 in the longitudinal direction (direction along the axis O). By forming the blade 40 integrally with the support plate 50, the blade base 40 c is fixed to the first surface 50 a of the support plate 50, and the opposite side of the blade base 40 c in the longitudinal direction of the blade 40 is the blade tip 40 d. The length L1 of the blade 40 (the dimension from the blade base 40c to the blade tip 40d) is, for example, about 10 cm. The blade 40 has a suction surface 40f and a pressure surface e. When the fan block 30 rotates in the direction A1 indicated by the arrow in FIG. 5, the pressure on the pressure surface 40e side of the blade 40 increases, and the pressure on the negative pressure surface 40f side decreases.

  Among the plurality of blades 40, there is one in which a notch 40i is formed in the blade tip 40d. This notch 40i is used for positioning the two fan blocks 30 or the fan block 30 and the end plate 21, and the stepped portion 23a of the concave portion 23 of the end plate 21 described above or the fan block 30 described later. This is a portion that fits into the step 51 c of the recess 51. Since there is the notch 40i, each blade 40 and each recess 23 of the end plate 21 or each recess 51 of the fan block 30 can be made to correspond one-to-one. When such positioning is possible, the plurality of blades 40 can correspond to the plurality of split molds of the mold at the time of injection molding for each group, and the blades 40 can be arranged so as to be easily removed from the split mold. Specifically, a non-rotationally symmetric shape in which the inclination of the blades 40 is changed in a direction in which the blades 40 are removed from the split mold in comparison with a configuration in which the plurality of blades 40 are rotationally symmetric with respect to the axis O. A plurality of blades 40 are disposed on the surface.

(3-2) Support Plate FIG. 7 shows a state in which the annular support plate 50 is viewed from the bottom surface, that is, a state viewed from the second surface 50b side. On the second surface 50b facing the first surface 50a of the support plate 50, a recess 51 into which the blade 40 is fitted is formed. Since each recess 51 has a planar shape slightly larger than the cross-sectional shape of each blade 40, when the two fan blocks 30 are overlapped, each blade 40 is fitted and fitted into each recess 51. The A ring-shaped convex portion 52 higher than the second surface 50 b is formed along the inner periphery of the support plate 50. The convex portion 52 is inclined obliquely on the outer peripheral side, and plays a role of guiding the blade 40 to the concave portion 51 when the two fan blocks 30 are overlaid.

  The outer periphery 51a of the recess 51 that contacts the outer end 40a of the blade 40 is inside the outer periphery 50c of the support plate 50, and the inner end 51b of the recess 51 that contacts the inner end 40b of the blade 40 is the inner periphery 50d of the support plate 50. On the outside. In other words, the distance d1 from the center of the support plate 50 (a point on the axis O) to the outer periphery 51a of the recess 51 (the distance from the outer end 40a of the blade 40) is the radius from the center of the support plate 50 to the outer periphery 50c. smaller than r1. The distance d2 from the center of the support plate 50 (a point on the axis O) to the inner end 51b of the recess 51 (the distance from the inner end 40b of the blade 40) is from the center of the support plate 50 to the inner periphery 50d. It is larger than the radius r2. In order to keep the strength of supporting the blades 40 high, the support plate 50 has a width W1 (radius r1-radius r2) of the support plate 50 that is a radial distance (distance) from the outer end 40a to the inner end 40b of the blades 40. It is set larger than d1−distance d2).

(3-3) Auxiliary ring The auxiliary ring 60 is located in the middle part of the blade 40 in the longitudinal direction, and is a distance of 60% of the dimension (the length L1 of the blade 40) from the blade base 40c to the blade tip 40d. Only a position away from the blade base 40c. In order to improve the strength of the cross flow fan 20 and facilitate an assembly process such as ultrasonic welding, the auxiliary ring 60 is disposed at a distance of 55% or more of the length L1 from the blade base 40c. It is preferable. However, it is not necessary to make 55% or more of the length L <b> 1 from the blade base 40 c, and it is only necessary to be located in the middle portion of the blade 40 in the longitudinal direction. As can be seen from the above description, the concept of the intermediate portion in the longitudinal direction of the blade 40 includes a form at a position slightly deviated from the center.

  FIG. 8 shows a cross-sectional shape of a portion where the auxiliary ring 60 and the blade 40 are joined. The cross section shown in FIG. 8 is a cross section that appears when cut along a plane perpendicular to the axis O. In FIG. 9, the auxiliary ring 60, the blade 40, and the support plate 50 are partially enlarged when viewed from the blade tip 40 d of the blade 40 toward the blade base 40 c. The auxiliary ring 60 mainly includes a ring part 61, a connection part 62, and a connection auxiliary part 63. The radius r3 of the outer periphery 61a of the ring part 61 is larger than the radius r1 of the outer periphery 51a of the support plate 50. Further, the radius r3 of the outer periphery 61a of the ring portion 61 is larger than the distance d1 from the center of the auxiliary ring 60 (a point on the axis O) to the outer end 40a of the blade 40. That is, the outer periphery 61 a of the ring portion 61 passes outside the outer ends 40 a of all the blades 40. In the auxiliary ring 60, the radius r4 of the inner periphery 61b of the ring portion 61 is larger than the radius r2 of the inner periphery 51b of the support plate 50 and slightly larger than the distance d1 to the outer end 40a of the blade 40. The inner circumference 61b passes near the outside of the outer end 40a of the blade 40.

  The connection part 62 is formed in a triangular shape protruding inward from the ring part 61 when viewed in the direction of the axis O. The triangular connection portion 62 has three top portions 62a, 62b, and 62c, the side between the top portions 62a and 62b is connected to the ring portion 61, and the side between the top portions 62a and 62c is the suction surface of the blade 40. 40f. On the other hand, the connecting portion 62 is not connected to the pressure surface 40 e of the blade 40. The length L4 (the length from the top portion 62a to the top portion 62c) of the portion where the connecting portion 62 is connected to the suction surface 40f is shorter than one half of the chord length L3. By setting the length L4 of the portion connected to the suction surface 40f to be shorter than one half of the chord length L3, air is blown compared to the case where it is set to be longer than one half of the chord length L3. The characteristics are improved.

  In the vicinity of the outer end 40a of the blade 40, a connection assisting portion 63 is formed. The connection auxiliary portion 63 is a portion that fills the space between the outer end 40a of the blade 40, the connection portion 62, and the ring portion 61, and assists the connection of these three members.

  FIG. 10 shows an enlarged part of the auxiliary ring 60 as seen from the side. The auxiliary ring 60 has a first surface 60a on the blade tip 40d side, a second surface 60b on the blade base 40c side, an outer peripheral surface 60c, and an inner peripheral surface 60d. A curved surface 60e having a radius of curvature R1 is formed at a portion connecting the first surface 60a and the outer peripheral surface 60c, and a curved surface 60f having a radius of curvature R2 is formed at a portion connecting the second surface 60b and the outer peripheral surface 60c. Has been.

  The auxiliary ring 60 is thinner as it goes from the inner circumference side to the outer circumference side. That is, the auxiliary ring 60 has a thickness t2 on the outer peripheral surface 60c smaller than a thickness t1 in the vicinity of the blade base 40c. In more detail, the first surface 60a of the auxiliary ring 60 has an inclination angle θ1 that intersects a plane perpendicular to the axis 0 and a tilt angle θ2 that the second surface 60b intersects this perpendicular plane. Is set to The thickness t1 of the auxiliary ring 60 is set smaller than the thickness t3 of the support plate 50.

(4) Modification (4-1)
Although the case where one auxiliary ring 60 is provided in one fan block 30 has been described in the above embodiment, a plurality of auxiliary rings 60 may be provided in one fan block 30.

(4-2)
In the above embodiment, the case where the radius r3 of the outer periphery 61a of the ring portion 61 is larger than the radius r1 of the outer periphery 51a of the annular support plate 50 has been described. It may be set to be the same as the radius r1 of the 50 outer peripheries 51a.

(4-3)
In the above embodiment, the case where the radius r4 of the inner periphery 61b of the ring part 61 is slightly larger than the distance d1 to the outer end 40a of the blade 40 has been described, but the radius r4 is equal to the distance d1 and the inner periphery of the ring part 61 You may comprise 61b so that the outer end 40a of the blade | wing 40 may pass.

(4-4)
In the above embodiment, the case where the shape of the auxiliary ring 60 is an annular shape has been described. However, the shape of the auxiliary ring 60 is not limited to an annular shape, and has, for example, the same number of corners as the number of blades 40. It may be a polygonal shape or a shape with serrations (many notches) at the outer peripheral edge.

(5) Features (5-1)
As described above, the ring portion 61 of the auxiliary ring 60 is located outside the outer ends 40 a of the plurality of blades 40 and is positioned in the middle portion of the plurality of blades 40 in the longitudinal direction. The plurality of connection portions 62 of the auxiliary ring 60 extend from the ring portion 61 to between adjacent blades of the plurality of blades 40 and are joined to the blades 40 between adjacent blades. In other words, the term “between adjacent blades” refers to a region sandwiched between the pressure surface 40 e of one blade 40 of the plurality of blades 40 and the negative pressure surface 40 f of the blade 40 adjacent to the blade 40.

  By connecting the auxiliary ring 60 to the blade 40 at the connecting portion 62 that extends only between adjacent blades, flow path pressure loss is suppressed. At the same time, the ring-shaped ring portion 61 bundles the plurality of blades 40 at the intermediate portion in the longitudinal direction of the plurality of blades 40, whereby the strength of the fan block 30 including the annular support plate 50 and the plurality of blades 40 is reinforced. The

  For example, to obtain a block similar to the length L1 fan block 30, instead of the auxiliary ring 60, as shown in FIG. The structure joined by the support plate 150 can be considered. Here, the structure of the support plate 150 is the same as that of the support plate 50 described above. When the two fan blocks 130 in FIG. 11 and the one fan block 30 in FIG. 5 are compared, the strength when the impeller is configured is almost the same. However, in the configuration shown in FIG. Since 150 is located in the middle of the block, the flow path loss of the two fan blocks 130 becomes larger than in the case of the auxiliary ring 60. Furthermore, in the configuration as shown in FIG. 11, an increase in the cost for assembly can be considered due to an increase in the number of steps for joining the two fan blocks 130.

  In addition, although the said embodiment demonstrated the case where the support plate 50 was circular, even if a support plate is disk shape, it can form similarly to the case where it is circular, and uses a disk-shaped support plate. Even in this case, the same effect as that obtained when the annular support plate 50 is used can be obtained.

(5-2)
In the cross flow fan 10, each connecting portion 62 is joined to the negative pressure surface 40 f of each blade 40 and is not joined to the pressure surface 40 e of each blade 40. Even if there is the auxiliary ring 60, since the loss on the pressure surface 40e side is reduced by the absence of the connecting portion 62 on the pressure surface 40e of the blade 40 in this way, the pressure side 40f side with a small pressure is reduced. The effect of suppressing the flow path loss can be enhanced rather than reducing the loss.

(5-3)
Each connection portion 62 is formed in a triangular shape protruding inward from the ring portion 61. Then, one side of the triangular connection part 60 (side between the top part 62 a and the top part 62 c) is joined to the negative pressure surface 40 f of the blade 40. Since one side of the triangular connecting portion 62 is joined to the suction surface 40f of the blade 40, the joining portion can be enlarged relative to the area of the connecting portion 62. On the other hand, since one of the vertices is on the pressure surface side of the other blade, the flow path loss increased by the connecting portion can be suppressed low. With such a structure, it is possible to simultaneously improve the effects of reducing the flow path loss and preventing the strength of the cross flow fan 10 from being reduced. In the connection portion 60 described above, the sides between the top portions 62a, 62b, and 62c are substantially linear, but each side may be slightly uneven.

(5-4)
As shown in FIG. 9, in the auxiliary ring 60, the length L4 of the portion where the connecting portion 62 is joined to the suction surface 40 f of the blade 40 is not more than half the chord length L3 of the blade 40. Therefore, the area occupied between adjacent blades of the connecting portion 62 is reduced, and the flow path loss is suppressed.

(5-5)
By setting the radius r4 of the inner periphery of the ring part 61 to be equal to or greater than the distance d1 from the axis O of the central axis of the cross flow fan 10 to the outer end 40a of the blade 40, the inner periphery of the ring part 61 However, the air flow on the central axis side is not hindered by the ring portion 61. Thereby, the flow path loss can be easily suppressed, and the strength of the auxiliary ring 60 can be increased by increasing the distance from the inner periphery to the outer periphery of the ring portion 61 (the width W2 of the ring portion).

(5-6)
In the cross flow fan 10 described above, the auxiliary ring 60 and the plurality of blades 40 are formed of resin, and the auxiliary ring 60 is formed integrally with the plurality of blades 40 by injection molding or the like. By forming the auxiliary ring 60 integrally with the plurality of blades, the assembly of the auxiliary ring and the plurality of blades becomes unnecessary, and the cost can be reduced. Similarly, the support plate 50 is also formed of resin, and is formed integrally with the auxiliary ring 60 and the plurality of blades 40 by injection molding or the like simultaneously with the plurality of blades 40 and the auxiliary ring 60. Therefore, the cost reduction effect by reducing the assembly man-hour is further increased.

(5-7)
Further, the auxiliary ring 60 becomes thinner as the thickness of the ring portion 61 goes from the inner peripheral side to the outer peripheral side. That is, the inner thickness t1 is larger than the outer thickness t2. Therefore, the fluid loss of air in the auxiliary ring 60 can be reduced, and the air blowing characteristics can be improved. In addition, it is preferable that the thickness of the auxiliary ring 60 decreases from the connecting portion 62 to the ring portion 61 as it goes to the outer peripheral side. Also in this case, the air blowing characteristics can be further improved. Further, since the auxiliary ring 60 is thinner on the outer peripheral side than on the inner peripheral side, the fan block 30 of the cross flow fan 10 can be easily removed from the mold during injection molding.

DESCRIPTION OF SYMBOLS 10 Cross flow fan 20 Impeller 30 Fan block 40 Blade 50 Support plate 60 Auxiliary ring 61 Ring part 62 Connection part

Japanese Patent Laid-Open No. 05-87086

Claims (4)

A disc-shaped or annular support plate (50);
A plurality of blades (40) extending longitudinally from the support plate;
A ring portion (61) located in an intermediate portion in the longitudinal direction of the plurality of blades and continuously formed annularly outside the outer ends of the plurality of blades; and a plurality of the blades from the ring portion An auxiliary ring (60) having a plurality of connections (62) extending between adjacent blades and joined to the blades between the adjacent blades;
With
The auxiliary ring is formed integrally with a plurality of the blades using a thermoplastic resin as a main material,
The support plate is made of a thermoplastic resin as a main material, has an outer periphery outside the outer ends of the plurality of blades, and is molded integrally with the plurality of blades .
The auxiliary ring has a plurality of connection portions formed in a substantially triangular shape protruding inward from the ring portion, and one side of the connection portion in the substantially triangular shape is joined to the suction surface of the blade. A cross flow fan. In the auxiliary ring, the length (L4) of the portion where the connecting portion is joined to the suction surface of the blade is less than half of the chord length (L3) of the blade,
The crossflow fan according to claim 1 . In the auxiliary ring, the ring portion has an annular shape, and the radius (r4) of the inner periphery of the ring portion is a distance (d1) from the central axis of the cross flow fan to the outer end (40a) of the blade. Is greater than or equal to
The crossflow fan according to claim 1 or 2 . The auxiliary ring is thinner as the thickness of the ring part goes from the inner peripheral side to the outer peripheral side,
The crossflow fan according to any one of claims 1 to 3 .

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