JP2014047773A - Cross flow fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce the strength of a cross flow fan while restraining an increase in a flow passage loss caused by a reinforcing member of the cross flow fan such as a supporting plate.SOLUTION: A plurality of blades 40 extend longitudinally from a supporting plate 50. An auxiliary ring 60 is located at a longitudinally intermediate part of the plurality of blades 40, and is connected to outer ends 40a of the plurality of blades 40. The distance between the auxiliary ring 60 and blade base parts 40c on the supporting plate side of the blades 40 is equal to or longer than 55% of the distance between the blade base parts 40c and blade tip parts 40d.

Description

  The present invention relates to a crossflow fan, particularly 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.

  The subject of this invention is reinforcing the intensity | strength of a crossflow fan, suppressing the increase in the flow path loss which generate | occur | produces in the reinforcement members of crossflow fans, such as a support plate.

  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. An auxiliary ring coupled to the outer end of the blade, the auxiliary ring being at a distance of 55% or more of the dimension from the blade base to the tip on the support plate side of the blade, away from the blade base.

  According to the crossflow fan according to the first aspect, since the auxiliary ring is separated from the blade base by a distance of 55% or more of the dimension from the blade base to the tip, the strength of the crossflow fan is improved while the auxiliary flow is increased. Since the ring is coupled to the outer ends of the plurality of blades, the flow path loss can be suppressed as compared with the conventional support plate that supports the outer end to the inner end.

  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 formed integrally with the plurality of blades.

  According to the crossflow fan according to the second aspect, by forming the auxiliary ring integrally with the plurality of blades, the work of connecting the auxiliary ring to the outer ends of the plurality of blades can be omitted. No assembly is required.

  A crossflow fan according to a third aspect of the present invention is the crossflow fan according to the second aspect, wherein the support plate includes a plurality of support plates, the auxiliary ring includes a plurality of auxiliary rings, and one support plate. A plurality of fan blocks in which one auxiliary ring and a plurality of blades are integrally formed are formed, and at least one fan block has a plurality of blades of other fan blocks fixed to a support plate.

  According to the cross-flow fan according to the third aspect, since the plurality of blades are coupled with the auxiliary ring that is 55% or more away from the blade base of the size from the blade base to the tip, the support plate of one fan block and It becomes easy to fix a plurality of blades of other fan blocks. Moreover, since the fixing of the blades is facilitated by the auxiliary ring, the blades of each fan block can be lengthened.

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

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

  The crossflow fan according to a fifth aspect of the present invention is the crossflow fan according to the fourth aspect, wherein the auxiliary ring has an outer periphery on the first surface closer to the tip of the blade than on the second surface closer to the support plate. The inclination from the side toward the inner periphery is increased.

  According to the cross-flow fan according to the fifth aspect, the first surface on the tip end side of the blade has a larger inclination from the outer peripheral side to the inner peripheral side than the second surface on the support plate side, so it is integrally molded Becomes easier.

  A crossflow fan according to a sixth aspect of the present invention is the crossflow fan according to any one of the first to fifth aspects, wherein the plurality of blades are arranged so that the outer ends are positioned concentrically, and the auxiliary ring is The outer periphery of the plurality of blades has an annular shape whose outer periphery passes through the outside.

  In the crossflow fan according to the sixth aspect, since the outer periphery of the auxiliary ring passes outside the outer end of the blade, the outer periphery of the auxiliary ring is continuously connected without being separated by the outer end of the blade. Strength can be increased.

  A crossflow fan according to a seventh aspect of the present invention is the crossflow fan according to any one of the first to sixth aspects, wherein the auxiliary ring has an annular shape and is the same as or supported by the outer diameter of the support plate. The outer diameter is larger than the outer diameter of the plate.

  According to the cross flow fan of the seventh aspect, since the outer diameter of the auxiliary ring is equal to or larger than the outer diameter of the support plate, the distance between the outer periphery of the auxiliary ring and the outer end of the blade is increased. The strength of can be increased.

  A crossflow fan according to an eighth aspect of the present invention is the crossflow fan according to any one of the first to seventh aspects, wherein the auxiliary ring is integrally formed with the main body having an annular shape, and the main body. A balancer portion that partially increases the weight of the auxiliary ring to balance rotation.

  According to the crossflow fan according to the eighth aspect, since the balancer portion of the crossflow fan is formed integrally with the main body portion of the auxiliary ring, the number of assembling steps related to the balancer portion can be saved.

  The crossflow fan according to a ninth aspect of the present invention is the crossflow fan according to the eighth aspect, wherein the auxiliary ring is a convex portion provided with a balancer portion on the inner peripheral side of the main body portion.

  According to the crossflow fan according to the ninth aspect, since the balancer portion of the crossflow fan is provided on the inner peripheral side of the main body portion, it is possible to suppress a decrease in performance related to blowing of the crossflow fan due to the provision of the balancer portion.

  The crossflow fan according to a tenth aspect of the present invention is the crossflow fan according to the eighth aspect, wherein the auxiliary ring is a convex portion in which the balancer portion is provided in the thickness direction of the main body portion.

  According to the crossflow fan according to the tenth aspect, since the balancer part of the crossflow fan is provided in the thickness direction of the main body part, the balancer part can be provided so as not to increase the air resistance, and by providing the balancer part It is possible to suppress a decrease in performance related to the blowing of the cross flow fan.

  In the cross flow fan according to the first aspect of the present invention, it is possible to reinforce the strength of the cross flow fan while suppressing an increase in flow path loss by the auxiliary ring.

  In the crossflow fan according to the second aspect of the present invention, the assembly of the auxiliary ring and the plurality of blades becomes unnecessary, and the cost can be reduced.

  In the crossflow fan according to the third aspect of the present invention, the number of fan blocks can be reduced to reduce the manufacturing cost.

  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.

  In the crossflow fan according to the fifth aspect of the present invention, since the integral molding is facilitated, the yield is improved, and the crossflow fan can be provided at a low cost.

  In the crossflow fan according to the sixth aspect of the present invention, the strength of the auxiliary ring can be increased and the strength reinforcing effect of the crossflow fan can be improved.

  In the cross flow fan according to the seventh aspect of the present invention, the strength of the auxiliary ring can be increased and the strength reinforcement effect of the cross flow fan can be improved.

  With the crossflow fan according to the eighth aspect of the present invention, it is possible to provide a crossflow fan in which rotational vibration is suppressed by the balancer portion at a low cost.

  In the crossflow fan according to the ninth aspect of the present invention, it is possible to reduce the runout of rotation while suppressing a decrease in performance related to blowing by the balancer unit.

  In the crossflow fan according to the tenth aspect of the present invention, it is possible to reduce runout of rotation while suppressing a decrease in performance related to blowing by the balancer unit.

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. The partial enlarged plan view for demonstrating the modification of a structure of a fan block. The partial expanded side view for demonstrating the modification of a structure of a fan block.

  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 one of the four fan blocks 30 is disposed at the other end. The end plate 21 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 portion 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.

  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)
In the above embodiment, the connecting portion 62 of the auxiliary ring 60 has a triangular shape in plan view. However, the planar shape of the connecting portion 62 is not limited to the triangular shape, and other shapes such as a semicircular shape and a trapezoidal shape, for example. It may be.

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

(4-3)
In the above embodiment, as illustrated in FIG. 8, the case where the auxiliary ring 60 includes the ring portion 61 having the annular shape, the connection portion 62, and the connection auxiliary portion 63 has been described. However, the auxiliary ring may have a structure other than these. For example, a balancer part may be further added to the auxiliary ring 60 (main body part). The balancer portion is integrally formed with the auxiliary ring 60 (main body portion), and partially increases the weight of the auxiliary ring 60 in order to balance the rotation of the fan block 30. The ring portion 61, the plurality of connection portions 62, and the connection assisting portion 63 are arranged rotationally symmetrically about the axis O, whereas the balancer portion is not arranged rotationally symmetrical.

  If the balancer portion of the cross flow fan 10 is formed integrally with the main body portion (ring portion 61, connection portion 62, and connection auxiliary portion 63) of the auxiliary ring, the assembly man-hour associated with the balancer portion can be saved. Thereby, the cross flow fan 10 in which the runout of rotation is suppressed by the balancer portion can be provided at a low cost.

  When the balancer portion of the fan block 30 is formed integrally with the main body portion of the auxiliary ring (the ring portion 61, the connection portion 62, and the connection auxiliary portion 63), the assembly man-hour associated with the balancer portion can be saved. Further, by providing the balancer portion in the auxiliary ring 60 in the outer diameter portion, the balancer portion resin amount can be reduced and the cost can be reduced. Conventionally, in order to correct the fan block imbalance by arranging the blades at unequal pitches, an annular support plate or a balancer portion is provided on the inner peripheral side thereof, but the auxiliary ring 60 on the outer diameter side is provided on the auxiliary ring 60. Providing a balancer part can reduce the amount of resin and reduce costs. In addition, it is more efficient to correct the unbalance with the auxiliary ring 60 at the substantially central portion of the blade 40, instead of correcting the balance of the blade 40 with an unequal pitch arrangement with the support plate 50 of the blade base 40c. Thereby, the cross flow fan 10 in which the runout of rotation is suppressed by the balancer portion can be provided at a low cost.

  For example, as shown in FIG. 12, the balancer portion can be provided as a convex portion 64 on the inner peripheral surface 60 d of the auxiliary ring 60 on the inner peripheral side of the main body portion. In addition, in FIG. 12, the substantially linear part 64a shown with the dashed-two dotted line is a shape when a balancer part is not provided. As described above, when the balancer part is provided on the inner peripheral side of the main body part, it is possible to reduce the runout of the rotation while suppressing the performance deterioration related to the air blowing due to the provision of the balancer part.

  For example, as shown in FIG. 12, the balancer portion can be provided as a convex portion 64 on the inner peripheral surface 60 d of the auxiliary ring 60 on the inner peripheral side of the main body portion. In FIG. 12, the substantially linear portion 64a indicated by the two-dot difference line is a shape in the case where no balancer portion is provided. As described above, when the balancer part is provided on the inner peripheral side of the main body part, it is possible to reduce the runout of the rotation while suppressing the performance deterioration related to the air blowing due to the provision of the balancer part.

  Moreover, the convex part provided in the thickness direction of the main-body part may be sufficient as a balancer part. For example, as shown in FIG. 13, a convex portion 65 of the auxiliary ring 60 in which one of the plurality of connection portions 62 and the plurality of connection auxiliary portions 63 is increased can be provided as a balancer portion. Or the convex part 66 of the auxiliary | assistant ring 60 which increased a part of thickness of the ring part 61 can also be provided as a balancer part. Since the balancer part of the crossflow fan 10 is provided in the thickness direction of the main body part, the balancer part is provided so as not to increase the air resistance, and the deterioration of the performance related to the airflow of the crossflow fan due to the provision of the balancer part is suppressed. The runout of rotation can be reduced.

(5) Features (5-1)
The ring portion 61 of the auxiliary ring 60 is located at an intermediate portion in the longitudinal direction of the plurality of blades 40 and is coupled to the outer ends 40 a of the plurality of blades 40. Since the auxiliary ring 60 is coupled to the outer ends 40a of the plurality of blades 40, the flow path loss is suppressed as compared with the case where the annular plate-shaped member supports the outer end to the inner end of the blades 40. Moreover, in the said embodiment, the auxiliary | assistant ring 60 exists in the position 60% of the dimension from the blade | wing base part 40c by the side of the support plate side of the blade | wing 40 to the blade | wing front-end | tip part 40d, and the position away from the blade | wing base part 40c. Since the auxiliary ring 60 is separated from the blade base 40c by a distance of 55% or more of the dimension from the blade base 40c to the blade tip 40d, the strength of the cross flow fan 10 is improved. .

  Since the blade 40 has a gently curved plate shape, it is easy to bend in the width direction of the blade 40. By bending, stress concentrates on a joint portion between the blade base 40c or the blade tip 40d and the support plate 50 or the end plate 21, and it becomes fragile or causes vibration. Further, by bending, it becomes easy to cause poor bonding when the blade 40 is bonded to the support plate 50 or the end plate 21 by ultrasonic welding or the like. When the plurality of blades 40 are bundled by the auxiliary ring 60, the blades 40 are difficult to bend, and thus problems such as breakage due to stress concentration and bonding failure due to bending and generation of noise can be solved. In addition, the blade collapse after molding can be suppressed, the insertion into the welding slot is facilitated, and the blade rigidity on the tip side from the auxiliary ring can be sufficiently secured, so that the workability is further improved. Thus, considering that the blade tip portion 40d is joined, the blade tip portion is separated from the blade base portion 40c by a distance of 55% or more of the dimension from the blade tip portion 40d to the blade tip portion more than the middle in the longitudinal direction of the blade 40. An auxiliary ring 60 is provided at a position close to 40d. In the above-described embodiment, the distance is 60%, but when the blades 40 are bundled at the middle part in the longitudinal direction, for example, a distance of 55% or more and 75% or less, more preferably a distance of 60% or more and 65% or less. It is preferable that it exists in.

  For example, in order to obtain a block similar to the fan block 30 of length L1, instead of the auxiliary ring 60, as shown in FIG. The structure which joins by 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 positioned in the middle of the block, not only the passage loss of the two fan blocks 130 is increased, but also the effective blade length is shortened as compared with 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.

(5-2)
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 integrally formed 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.

(5-3)
The support plate 50 is also formed of resin, and a plurality of fan blocks 30 in which one support plate 50, one auxiliary ring 60, and a plurality of blades 40 are integrally formed are formed by injection molding or the like. And since the several blade | wing 40 is couple | bonded by the auxiliary | assistant ring 60 which is 55% or more away from the blade | wing base part 40c of the dimension from the blade | wing base part 40c to the blade | wing front-end | tip part 40d, the support plate 50 of one fan block 30 and others The plurality of blades 40 of the fan block are easily fixed. As a result, it is possible to lengthen the blades 40 of each fan block 30 to reduce the number of fan blocks and to reduce the manufacturing cost.

(5-4)
In the auxiliary ring 60 described above, the thickness of the ring portion 61 becomes thinner 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. Furthermore, since the auxiliary ring 60 is thinner on the inner peripheral side than on the outer peripheral side, the fan block 30 of the cross flow fan 10 can be easily removed from the mold during injection molding.

(5-5)
Further, in the auxiliary ring 60, the first surface 60a on the blade tip 40d side has a larger inclination from the outer peripheral side to the inner peripheral side than the second surface 60b on the support plate 50 side. Since the first surface 60a has a larger inclination from the outer peripheral side to the inner peripheral side than the second surface 60b on the support plate 50 side, for example, centering on a place near the blade tip 40d after injection molding. When the mold is rotated and removed from the fan block 30, the molded product can be easily removed. The mold for such removal has a parting surface that is divided into a plurality of parts around the axis O, for example. Thus, since the integral molding becomes easy, the yield can be improved and the manufacturing cost of the cross flow fan 10 can be reduced.

(5-6)
The plurality of blades 40 are arranged so that the outer ends 40a are positioned concentrically around the axis O. Further, the auxiliary ring 60 has an annular shape in which the outer peripheral surface 60 c passes outside the outer ends 40 a of the plurality of blades 40. Since the outer peripheral surface 60c of the auxiliary ring 60 passes outside the outer end 40a of the blade 40, the outer peripheral surface 60c of the auxiliary ring 60 is continuously connected without being divided by the outer end 40a. Thereby, the strength of the auxiliary ring 60 can be increased, and the effect of reinforcing the strength of the cross flow fan 10 can be improved.

(5-7)
The auxiliary ring 60 has an annular shape and has an outer diameter r3 larger than the outer diameter r1 of the support plate 50. When the outer diameter r3 of the auxiliary ring 60 is equal to or larger than the outer diameter r1 of the support plate 50, the distance between the outer peripheral surface 60c of the auxiliary ring 60 and the outer end 40a of the blade 40 is increased to increase the strength of the auxiliary ring 60. Can be raised. By increasing the strength of the auxiliary ring 60 in this manner, the strength reinforcing effect of the cross flow fan 10 can be improved.

10 Cross Flow Fan 20 Impeller 30 Fan Block 40 Blade 50 Support Plate 60 Auxiliary Ring

Japanese Patent Laid-Open No. 05-87086

Claims (10)

A disc-shaped or annular support plate (50);
A plurality of blades (40) extending longitudinally from the support plate;
An auxiliary ring (60) located at an intermediate portion in the longitudinal direction of the plurality of blades and coupled to the outer ends (40a) of the plurality of blades;
With
The cross flow fan, wherein the auxiliary ring is located at a distance of 55% or more of the dimension from the blade base (40c) to the tip (40d) on the support plate side of the blade, away from the blade base. The auxiliary ring is formed integrally with the plurality of blades.
The crossflow fan according to claim 1. The support plate includes a plurality of support plates;
The auxiliary ring includes a plurality of auxiliary rings,
A plurality of fan blocks formed integrally with one support plate, one auxiliary ring and a plurality of blades are formed,
At least one of the fan blocks has a plurality of the blades of another fan block fixed to the support plate.
The crossflow fan according to claim 2. The auxiliary ring is thinner as it goes from the inner circumference side to the outer circumference side,
The crossflow fan according to claim 1 or 2. In the auxiliary ring, the inclination of the first surface (60a) on the tip end side of the blade is larger from the outer peripheral side to the inner peripheral side than the second surface (60b) on the support plate side. Yes,
The crossflow fan according to claim 4. The plurality of blades are arranged so that the outer ends are positioned concentrically,
The auxiliary ring has an annular shape whose outer periphery (60c) passes outside the outer ends of the plurality of blades.
The crossflow fan according to any one of claims 1 to 5. The auxiliary ring has an annular shape and has an outer diameter (r3) that is equal to or larger than the outer diameter (r1) of the support plate.
The crossflow fan according to any one of claims 1 to 6. The auxiliary ring includes a main body portion having an annular shape, and a balancer portion (64, 65) integrally formed with the main body portion and partially increasing the weight of the auxiliary ring to balance rotation. Having
The crossflow fan according to any one of claims 1 to 7. The auxiliary ring is a convex portion (64) in which the balancer portion is provided on the inner peripheral side of the main body portion.
The crossflow fan according to claim 8. The auxiliary ring is a convex portion (65) in which the balancer portion is provided in the thickness direction of the main body portion.
The crossflow fan according to claim 8.