JP2006112264A - Centrifugal fan and method for manufacturing centrifugal fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a centrifugal fan excellent in assembly workability and enabling to easily manufacture even a fan with a structure having a projection demonstrating noise suppression effect or the like formed on a blade surface. <P>SOLUTION: A blade piece connecting means including a pair of blade piece connecting parts 16a, 16b continuously formed to make distance between the upper end parts and distance between lower end parts and connecting each upper end parts and each lower end parts of each blade piece 4a respectively and a fixing part 17 connecting the blade piece connecting parts 16a, 16b as one unit is provided. At least one of a blade connecting plate piece part 5a side and a rotary base plate piece part 3a side are fixed by a fixing means after gradually reducing interval between a plurality of the blade pieces 4a to form a cylinder body by sliding a guide pin 18 projectingly provided on an upper end part a lower end part of the fixing part 17 of the blade piece connecting means along a round shape guide groove 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a centrifugal fan manufacturing method and a centrifugal fan, and more particularly to a centrifugal multiblade fan having a cylindrical shape in which a plurality of blades are arranged in an annular shape and a manufacturing technique thereof.

  In general, an automotive air conditioner includes a centrifugal fan that is rotationally driven by an electric motor at the upstream end of a duct. When the automobile air conditioner is in operation, the centrifugal fan is rotated to suck air from the vehicle interior or the exterior of the vehicle interior and send the air into the duct. The air sent into the duct in this way is adjusted to a desired temperature by passing through an evaporator, a heater core, or the like disposed in the duct, and then from the air outlet provided at the downstream end of the duct. It is made to blow out indoors.

  As such a centrifugal fan, a centrifugal multiblade fan having a cylindrical shape in which a plurality of blades are arranged in an annular shape on a disk portion is used. In such a centrifugal multiblade fan, various devices have been made to suppress the generation of noise as much as possible. For example, as shown in FIG. 14, slits 104A and 104B are formed in the blade width direction (longitudinal direction) of the wing 103 attached at equal intervals to the disk portions 101 and 102 arranged at the upper and lower positions in the gravitational direction to A reduction is known (for example, see Patent Document 1).

  It is known that the centrifugal multiblade fan 105 including the blades 103 in which the slits 104A and 104B are formed can secure a large air flow rate and reduce airflow noise generated during operation. Centrifugal multiblade fans having normal blades without slits 104A, 104B, etc. are made by injecting a material such as synthetic resin into a cavity formed by an upper mold and a lower mold, and then performing injection molding. Molding is performed by dividing the mold and the lower mold in the vertical direction and then removing the mold vertically.

  On the other hand, when the slits 104A and 104B are formed on the wing 103 in order to exert a noise reduction effect, a plurality of blade-like plate portions 106 for forming the slits 104A are provided in the upper die, and the lower die is similarly provided. It is necessary to provide a plurality of blade-like plate portions 107 for forming the slits 104B. In this case, since the molded product can be pulled out in the vertical direction, molding can be performed relatively easily only by increasing the number of components of the mold.

  However, the shape having a convex portion in a direction intersecting with the vertical direction, which is the mold drawing direction (a shaded shape when viewed from above and below) cannot mold a fan with a mold structure that is drawn in the vertical direction. .

  Therefore, conventionally, there has been proposed a method of forming a centrifugal multiblade fan by separating a blade and a disk portion and inserting each blade into a notch portion of the disk portion (for example, Patent Document 2 or Patent). Reference 3 etc.). However, this method complicates the process of aligning the blades and inserting them into the notch, and becomes unstable, resulting in poor mass productivity.

  In addition, as described above, since it takes time to align the wings and the disk portion, it is necessary to arrange the wings so that the wing row magazines are arranged so as not to be scattered (for example, , See Patent Document 4). However, with this method, a blade cascade magazine cannot be used for a blade that has a narrow blade spacing and a long chord length and can be shaded.

Also, in order to make assembly work as easy as possible, a method has been proposed in which the blade rows are integrally formed for every certain number of sheets with the aim of reducing the number of parts, stabilizing the assembly process, and simplifying the assembly (for example, , See Patent Document 5). However, such a method is halfway, and is still at the processing limit for demands for more blades and longer chords.
JP-A-10-306796 (page 9, FIG. 16) JP-A-6-241196 (2nd page, FIG. 1) JP-A-6-58290 (pages 3 and 4; FIGS. 1 and 2) JP-A-9-49499 (2nd page, FIG. 5) Japanese Patent Publication No. 5-88400 (pages 2 and 3; FIGS. 3 and 4)

  As described above, any of the above-described methods is troublesome in processing and assembling, and still has an insufficient problem in assembling workability. In addition, it is difficult to sufficiently cope with any of the above-described methods for a multiblade long string centrifugal fan.

  Therefore, the present invention has been made in view of the above-described problems, and can be easily manufactured even with a structure in which convex portions and the like that exhibit a noise suppression effect are formed on the blade surface while being excellent in assembling workability. A method for manufacturing a centrifugal fan and a centrifugal fan are provided.

  The invention according to claim 1 is formed integrally with a circular rotating substrate, a plurality of blades standing upright at substantially equal intervals on the peripheral portion of the rotating substrate, and upper ends of these blades. An annular blade connecting plate, at least a blade connecting plate piece constituting a part of the blade connecting plate at the upper end and a rotating substrate piece constituting a part of the rotating substrate at the lower end. Manufacture of a centrifugal fan that integrally fixes a plurality of blade pieces after assembling them into a cylindrical body by abutting the blade connection plate pieces and the rotating substrate pieces together. A method of connecting a pair of continuously formed blade pieces by connecting the upper end portions and the lower end portions of the blade pieces to each other so that the distance between the upper end portions and the distance between the lower end portions are variable. And the connection between these blades A blade piece coupling means having a fixed portion to be coupled is provided, and guide pins projecting from the upper end portion and the lower end portion of the fixed portion in the blade piece coupling means are slid along a circular guide groove. The cylindrical member is formed by gradually reducing the interval between the plurality of blade pieces, and then at least one of the blade connecting plate piece side and the rotating substrate piece side is fastened by fastening means. .

  The invention according to claim 2 is the method of manufacturing the centrifugal fan according to claim 1, wherein when each of the blade pieces is assembled into a cylindrical body, at least one of the blade connecting plate piece portion and the rotating substrate piece portion. A convex portion and a concave portion formed in the crab are engaged with each other.

  Invention of Claim 3 is a manufacturing method of the centrifugal fan of Claim 2, Comprising: The said convex part is 10 [degree]-80 [degree] inclination with respect to the fan rotation direction of a centrifugal fan. , 0.5 [mm] to 5 [mm] in thickness.

  According to a fourth aspect of the present invention, there is provided a method of manufacturing a centrifugal fan according to any one of the first to third aspects, wherein each of the blade pieces has the blade connecting plate piece rotated by the fan rotation. And the rotary substrate piece is provided on the negative pressure surface side.

  Invention of Claim 5 is a manufacturing method of the centrifugal fan as described in any one of Claim 1 to Claim 4, Comprising: The said fastening means is the said blade | wing connection plate piece part side and a rotation board piece. It is provided on both sides of the part side.

  The invention according to claim 6 is the method for manufacturing the centrifugal fan according to claim 1 or 5, wherein the blade connecting plate piece is provided with a rib for preventing the fastening means from coming off. Features.

  The invention according to claim 7 is the method for manufacturing the centrifugal fan according to claim 1 or 5, wherein the rotating substrate piece portion is directly or directly on the rotor for rotating the rotating substrate. It is characterized by the fact that an engaging protrusion is provided for indirect engagement via a pin.

  The invention according to claim 8 is a method of manufacturing a centrifugal fan according to any one of claims 1 to 7, wherein each blade has a centrifugal fan between adjacent blades. A rectifying piece extending in the direction of fan rotation is formed between the upper end and the lower end of the wing piece, and each rectifying piece and the wing piece are abutted and assembled into a cylindrical body. And

  The invention according to claim 9 is the method for manufacturing the centrifugal fan according to any one of claims 1 to 8, wherein the blade piece and the blade piece connecting means are integrally injection-molded. It is characterized by forming.

  According to a tenth aspect of the present invention, a circular rotating substrate, a plurality of blades erected on the periphery of the rotating substrate at substantially equal intervals, and upper ends of these blades are integrally formed. A centrifugal fan having at least an annular blade connection plate, and having a blade connection plate piece portion constituting a part of the blade connection plate at an upper end portion and a rotation constituting a part of the rotating substrate After assembling a plurality of blade pieces having a substrate piece portion at the lower end portion into a cylindrical body by abutting each blade connection plate piece portion and each rotating substrate piece portion, the plurality of blade pieces are integrated together. It is characterized by being fixed.

  According to the first aspect of the present invention, the blade is integrally formed with the blade connecting plate piece constituting a part of the blade connecting plate at the upper end and the rotating substrate piece constituting the part of the rotating board at the lower end. A plurality of pieces slide a guide pin protruding from the blade piece connecting means along a circular guide groove to form a cylindrical body by gradually reducing the interval between the blade pieces. Thereafter, at least one of the blade connecting plate piece side and the rotating substrate piece side is integrally fastened (fixed) by fastening means, so that the guide pin performs processing positioning. The spacing and direction of each blade piece can be accurately controlled, assembly accuracy is high, assembly balance is minimized, and assembly strength in the centrifugal direction can be improved.

  In addition, the conveyance can be simplified because the guide pin may be pulled manually or automatically using another means. When the guide groove is of a cylindrical path type, it can be easily driven by a radial rod or a disk having a groove.

  Therefore, the centrifugal fan can be easily manufactured by simply assembling each blade piece by sliding the guide pin in the guide groove, and the assembling workability can be greatly improved.

  Moreover, since the parallel blade pieces can be prevented from being twisted by the fixing portions of the blade piece connecting means, handling during assembly work can be performed accurately and quickly, and complications can be prevented. Can do.

  Thus, according to the present invention, it is possible to realize a centrifugal fan manufacturing method that is excellent in assembling workability and that can be easily manufactured even with a structure in which convex portions or the like that exert a noise suppressing effect are formed on the blade surface. .

  According to invention of Claim 2, if the convex part and recessed part which were formed in either the wing | blade connection plate piece part and the rotation board piece part are made to engage, it will be cylindrical, even if it does not hold | maintain each wing piece temporarily. The completed state can be maintained, and the alignment of each blade piece can be facilitated, and the assembly work efficiency can be further improved. In addition, by engaging these concave and convex portions, it is possible to reliably prevent the blade pieces from being displaced or separated by the centrifugal force when the centrifugal fan rotates.

  According to the third aspect of the present invention, the convex portion formed on either the blade connecting plate piece portion or the rotating substrate piece portion is 10 [°] to 80 [°] with respect to the fan rotation direction of the centrifugal fan. By having an inclination, when each blade piece is reduced in diameter and assembled, the concave and convex portions of the adjacent blade pieces are smoothly fitted so that they slide, and after this fitting, the centrifugal direction ( That is, it can be made difficult to come off with respect to the fan rotation direction. In addition, by having a thickness of 0.5 [mm] to 5 [mm] at the tip of this convex part, when assembling with a reduced diameter, it does not lock and fits smoothly, at the fixed position. At the final fitting position, the resistance against the centrifugal direction can be exerted.

According to the invention described in claim 4, each blade piece is provided with the blade connecting plate piece portion on the pressure surface side in the fan rotation direction, so that when the blade piece is formed, the blade connecting plate piece portion is the pressure surface. Since the rectifying piece 6 and the rotating substrate piece 3a are on the negative pressure side, the blade piece can be easily formed by removing the front and rear of the mold, and the target performance can be prevented from being lowered. In addition, by providing the rotating substrate piece on the suction surface side, the forward-facing fan can easily form a circumferential shape and a warped shape on the inlet side, so a fluid shape with reduced performance degradation is suppressed. That is, it can be finished in a shape that can achieve the effect of noise reduction. Further, in addition to these, since the blade piece has the blade connecting plate piece portion on the pressure surface side in the fan rotation direction and the rotating substrate piece portion on the negative pressure surface side, the blade piece has a crank shape. It is possible to obtain an advantage that the bonding property between each other can be dispersed and strengthened in the blade width direction.
According to the invention described in claim 5, since the fastening means is provided on both sides of the blade connecting plate piece side and the rotary substrate piece portion side, after assembling each blade piece into a cylindrical body, the cylindrical body shape is surely secured. Can be retained. In addition, since the fastening force becomes strong and the shape can be stabilized, the effect of preventing scattering against centrifugal force can be further improved.

  According to the invention described in claim 6, since the ribs for preventing the fastening means from coming off are provided on the blade connecting plate piece, it is possible to prevent the fastening means from being displaced or detached by centrifugal force. Can do.

  According to the seventh aspect of the present invention, the rotating substrate piece is provided with an engaging protrusion for directly or indirectly engaging with the rotor for rotating the rotating substrate via the fastening means. The shaft runout during the rotation of the centrifugal fan can be minimized.

  According to the eighth aspect of the present invention, since the rectifying piece is integrally formed between the upper end portion and the lower end portion of the blade piece, if each blade piece is assembled into a cylindrical body, the flow path between the blades is set to the blade. The blade width direction of the separation vortex generated in the flow path between the blades which is divided in the width direction (longitudinal direction of the blades) and suppresses the amplification of the oscillation generated on the rotating substrate side when air flows in. A rectifying piece is obtained that segments the perturbations in.

  According to the ninth aspect of the present invention, the plurality of blade pieces having the blade connecting plate piece portion and the rotating substrate piece portion and the blade piece connecting means for connecting these blade pieces are integrally injection-molded. Since it can be formed, it is possible to go from the blade piece molding to the assembly process continuously, so it is possible to save the trouble of collecting the blade pieces and fitting them in a predetermined position, and to greatly simplify the manufacturing process. In addition, the number of parts can be reduced by integrally forming the blade pieces and the blade piece connecting means. In addition, any complicated wing shape can be formed as long as the shape is not shaded in two dimensions.

  According to the tenth aspect of the present invention, it is possible to easily manufacture even a structure in which a protrusion (that is, a rectifying piece) or the like that exhibits a noise suppressing effect is formed on the blade surface while being excellent in assembling workability. A centrifugal fan can be provided.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. In addition, this Embodiment is an example which applied the centrifugal fan which concerns on this invention to the air blower of a vehicle air conditioner.

"Configuration of centrifugal fan"
First, the structure of the centrifugal fan manufactured by the method of the present invention will be schematically described. FIG. 1 is a perspective view of a centrifugal fan according to the present invention, FIG. 2 is a cross-sectional view showing a major portion of the centrifugal fan in FIG. 1, and FIGS. 3 and 4 show a part (blade piece) of the centrifugal fan of FIG. FIG. 5 is a perspective view showing an essential part of the centrifugal fan shown in FIG.

  As shown in FIGS. 1 and 2, the centrifugal fan 1 according to the present embodiment has a cylindrical shape and is fixed to a convex rotor 2 bulging substantially in the center at a substantially conical shape, and a lower end peripheral portion of the rotor 2. A planar circular rotating substrate 3, a plurality of blades 4 erected on the peripheral edge of the rotating substrate 3 at substantially equal intervals, and a ring formed integrally with the upper ends of the plurality of blades 4. This is a centrifugal multiblade fan (so-called centrifugal multiblade fan) comprising the blade connecting plate 5.

  In addition, a shaft insertion port 50 into which a motor drive shaft (not shown) fixed to the case (not shown) side of the blower that houses the centrifugal fan 1 is inserted and fixed protrudes substantially at the center of the rotor 2. It is installed.

  Incidentally, the centrifugal fan 1 is accommodated in this case, and a circular suction port is formed on the upper surface of the centrifugal fan 1. Further, the case is formed with an air flow path that circulates in a spiral shape that gradually becomes a wide flow path from the narrow flow path so as to surround the stored centrifugal fan 1 and protrudes in the tangential direction of the centrifugal fan 1. . In this case, a cylindrical discharge port for discharging air from the end of the air flow path is formed, and the air flow path is substantially spiral toward the discharge port.

  In addition to this configuration, the centrifugal fan 1 is provided with various contrivances for the blade 4 in order to further improve noise reduction. That is, as shown in FIGS. 2 to 4, the centrifugal fan 1 extends in the fan rotation direction X (see FIG. 1) of the centrifugal fan 1 and adjacent ones are substantially parallel (identical). A plurality of rectifying pieces 6 are provided so as to be on the line. Further, the rectifying pieces 6 and 6 adjacent to each other in the blade width direction Y between the blades 4 and 4 are provided substantially horizontally at substantially uniform intervals in the blade width direction Y orthogonal to the fan rotation direction X, respectively. Yes.

  From another viewpoint, an annular (ring-shaped) disk plate having a width substantially the same as or shorter than the blade length of the blade 4 is used as a rectifying piece 6, and a plurality of the rectifying pieces 6 are formed into the annular shape. The blades 4 arranged at substantially equal intervals are integrated with a desired interval in the blade width direction Y. Furthermore, in other words, a plurality of the cylindrical bodies are arranged in the blade width direction Y with respect to the cylindrical body formed by arranging the plurality of blades 4 at substantially equal intervals. It is a structure in which each blade 4 is integrated with a desired interval so as to be divided into pieces.

  As shown in FIGS. 1 and 2, the rectifying piece 6 divides (divides) the flow path between the blades 4 and 4 in the blade width direction Y, and from above the centrifugal fan on the paper surface serving as the suction port. The air sucked in the direction of the rotation axis prevents separation vortices generated in the blades 4 and 4, the inter-blade inflow portion Ra, and the inter-blade outflow portion Rb from being disturbed in the blade width direction Y. Further, the rectifying piece 6 also functions to suppress amplification of oscillation generated on the rotating substrate 3 side when air flows in.

  Incidentally, the inter-blade inflow portion Ra and the inter-blade outflow portion Rb referred to here are a flow path defined by the blades 4 and 4 adjacent in the fan rotation direction and the rectifying pieces 6 and 6 adjacent in the blade width direction. It means the air inflow side, that is, the interblade inflow portion Ra, and the air outflow side, that is, the interblade outflow portion Rb.

  Therefore, the rectification piece 6 prevents the turbulence in the blade width direction Y of the separation vortex generated in the flow path between the blades 4 and 4 that has been amplified in conjunction with the amplification of the oscillation by segmentation (split). Thus, the disturbance between the blades 4 and 4 can be appropriately controlled, and the absolute value of the disturbance can be lowered. Thereby, it becomes possible to reduce the noise of an air blower as a whole.

  Further, since the rectifying piece 6 is provided between the blades 4 and 4, the rectifying piece 6 also acts as a reinforcing plate for the wing 4, so that the rigidity as the centrifugal fan 1 is secured and the structure is deformed. The thickness of each blade 4 can be reduced to the limit while improving the strength and vibration strength. Accordingly, the flow path between the blades 4 and 4 can be widened, and the number of blades can be increased, so that the air flow performance can be remarkably improved.

  Even when the flow passage between the blades 4 and 4 is narrowed by the plate thickness when the flow straightening piece 6 is provided and the air volume is reduced, the blade is slightly longer than the total plate thickness of the flow straightening pieces 6. By setting the width, it is possible to cover the decrease in the air volume. However, if this property is utilized to extend the blade width to the limit, it is possible to achieve a larger air volume and a greater noise reduction with the same projected area as before.

  This is different from the conventional countermeasures by increasing the diameter of the centrifugal fan 1 and reducing the rotation speed to reduce the noise, or reducing the noise of the fan by reducing the flow resistance and reducing the fan load. Since the noise can be essentially suppressed with a fan of a large size, it can be replaced with the conventional product (ie, no large capital investment is required), and the noise problem has been affected by the noise level while maintaining the desired air volume. It can be used for electronic products that have not been used, and can contribute to the expansion of the range of applications of the blower.

  Further, in the case of the centrifugal fan 1, a sawtooth-shaped uneven portion (so-called serration) 7 protruding toward the fan rotation direction X is provided at the end portion between the blade outflow portions Rb in the blades 4, 4. It is provided along Y.

  By this serration 7, the air flow accelerated and discharged between the blades 4 and 4 and the relatively slow air flow flowing around the centrifugal fan 1 are converted into the blade-side outflow portion Rb side end portion of the blade 4. Can be mixed gradually. Therefore, mixing of the air flowing out from the flow paths between the four and the four is alleviated, and noise generated by the mixing can be dispersed and reduced.

  Further, a direction (separate from the flow direction of the air flowing in along the blade 4 on the inter-blade outflow portion Rb side (that is, in the vicinity of the serration 7) on the suction surface of each blade 4, 4 of the centrifugal fan 1. In other words, a plurality of projecting portions 8 projecting in the thickness direction of the blade 4 are provided at predetermined intervals along the blade width direction Y.

  And this protrusion part 8 is the inter-blade outflow part Rb side, without letting the flow of the said air flow peel from wing | blade 4 by allowing the air which flowed into the flow path between wings 4 and 4 to pass through. Discharge from the Rb side end.

  At the same time, the protrusion 8 disperses the air flow on the pressure surface (front surface) side of the blade 4 and the air flow on the negative pressure surface (back surface) side in a stepwise manner. The pressure difference can be sufficiently relaxed (blurred) in advance.

  Therefore, the air discharged from the flow path between the blades 4 and 4 is sufficiently dispersed to diffuse the strength when the main streams of air flowing on both the pressure surface and the suction surface of the blade 4 collide or mix. It is possible to reduce the noise generated during the collision and mixing.

  Further, the blades 4 and 4 of the centrifugal fan 1 penetrate in the fan rotation direction X direction of the centrifugal fan 1 in the vicinity of the serration 7 of the inter-blade outflow portion Rb side end (that is, the blade 4 penetrates in the plate thickness direction). ) Through-holes 9 are formed. These through holes 9 are respectively formed at positions corresponding to the bottoms (valleys) of the teeth in the serration 7. Then, in the air flowing on the front surface (negative pressure surface) side and the air flowing on the back surface (pressure surface) side, air is leaked through the through hole 9 from the higher pressure side to the lower pressure side.

  As a result, the pressure difference between these airs can be relaxed (blurred) in advance. Therefore, it is possible to further disperse the air flowing out from the flow path between the blades 4 and 4 and to disperse the strength when the main flows of the air flowing on both the front and back surfaces of the blade 4 collide or mix. it can.

  Further, serrations 10 projecting in the fan rotation direction X are provided along the blade width direction Y at the end portions on the inter-blade inflow portion Ra side of the blades 4 and 4 of the centrifugal fan 1.

  With this serration 10, the flow of air flowing between the blades 4, 4 that are likely to be combined into one main flow can be dispersed at the end of the blade-inflow portion Ra of the blades 4, 4. Accordingly, the air introduced along with the rotation of the centrifugal fan 1 can be caused to flow along the blades 4 to the depth between the blades 4, 4, thereby reducing the generation of separation vortices due to the flowed-in air. it can.

  At the same time, the serration 10 can disperse the separation flow that is likely to occur on the back surface (pressure surface) side of the blade 4 (that is, the pressure difference between the front surface (negative pressure surface) side and the back surface side of the blade 4 is blurred). The air separation on the back surface side can be reduced, and the performance degradation and noise increase due to the narrowing (blocking) of the flow path accompanying the separation can be suppressed.

  Further, by dispersing the air flowing in from an oblique direction with respect to the rotation shaft (not shown) by the serrations 10, it is possible to suppress the fluctuation in the blade width direction Y and reduce the swing noise.

  In addition to this, since the blade 4 can be extended in the inner diameter direction of the centrifugal fan 1, the chord length can be increased equivalently, and the direction of air between the blades 4, 4 can be smoothed to improve the intake efficiency. Can be improved.

  This is different from the conventional countermeasures by increasing the fan outside diameter of the centrifugal fan 1 and reducing the rotation speed to reduce noise, or by reducing the flow path resistance and reducing the fan load to reduce noise. Because it can essentially suppress noise while maintaining the same fan size, it can be replaced with a conventional product (that is, no large capital investment is required) It can be employed in electronic products that have been difficult to use, and can contribute to the expansion of the application range of centrifugal fans.

  Further, a direction (another direction) perpendicular to the flow direction of the air flowing along the blade 4 toward the inter-blade inflow portion Ra (that is, in the vicinity of the serration 10) on the suction surface of each blade 4, 4 of the centrifugal fan 1. In other words, a plurality of projecting portions 11 projecting in the thickness direction of the blade 4 are provided at predetermined intervals along the blade width direction Y.

  And this protrusion part 11 distribute | circulates the air which flows in along the wing | blade 4 to the flow path between each wing | blade 4 and 4 in the wing | blade width direction Y in the inter-blade inflow part Ra side, and wing | blade 4 without peeling. Can be guided to the back of the flow path between the blades 4 and 4.

  For this reason, it is possible to suppress the separation vortex in the flow path between the blades 4 and 4 that has occurred at the time of the inflow of air, and it is possible to segment the disturbance in the blade width direction Y of the separation vortex.

  Accordingly, by appropriately controlling the turbulence between the blades 4 and 4, the absolute value of this turbulence can be reliably reduced, so that the noise caused by the air passing through the flow path between the blades 4 and 4 is sufficiently reduced. Can be made.

  Further, a through-hole 12 penetrating in the fan rotation direction X direction of the centrifugal fan 1 is formed in the vicinity of the serration 10 at the inter-blade inflow portion Ra side end portion of each blade 4, 4 of the centrifugal fan 1.

  Thereby, in addition to the effect of dispersing the air flow on both the front and back surfaces of the blade 4, excess air on the front surface side of the blade 4 flows out to the back surface side of the blade 4 by passing through the through-hole 12. It is possible to supplement the air flow rate that tends to be insufficient on the back surface side. That is, the pressure difference between the front and back surfaces of the blade 4 can be reduced.

  For this reason, it is possible to reduce air separation that is likely to occur on the back side of the blade 4, and it is possible to suppress performance degradation and noise increase due to the narrowing (blocking) of the flow path accompanying the separation. Therefore, a further noise reduction effect can be expected due to the synergistic effect of the dispersion of the inflowing air and the delamination prevention.

  In the case of this embodiment, the blade pieces 4a constituting the blades 4 and 4 are provided with blade connecting plate pieces 5a located on the upper side thereof on the pressure surface side in the fan rotation direction X.

  Thereby, when the blade piece 4a is processed and molded from the side surface (blade surface), since the blade connecting plate piece portion 5a is on the pressure surface side, the blade piece 4a can be easily formed. It can also prevent the performance from deteriorating.

  Further, the blade piece 4a is provided with a rotating substrate piece portion 3a positioned on the lower side thereof on the suction surface side. As a result, the forward-facing fan can easily form a circumferential shape or a warped shape on the inlet side, so that it can be finished into a fluid shape, that is, a shape capable of reducing the noise, while suppressing a decrease in performance.

  In addition to these, since the blade piece 4a has the blade connecting plate piece portion 5a on the pressure surface side in the fan rotation direction X and the rotating substrate piece portion 3a on the negative pressure surface side, the blade piece 4a has a crank shape. In addition, it is possible to obtain an advantage that the joining property between the adjacent blade pieces 4a and 4a can be dispersed and strengthened in the blade width direction Y.

  As shown in FIG. 5, the blade connecting plate pieces 5a and the rotating substrate piece 3a are fastened together when the blade pieces 4a and 4a are bundled into a cylindrical shape. Fastening grooves 5b (separation prevention ribs) and fastening grooves 3b are provided so as not to remove the resin band 13 which is a fastening means for fastening.

  The blade connecting plate piece 5a is formed with a concave portion 14a and a convex portion 14b for fitting adjacent blade pieces 4a and 4a together, and adjacent to the rotating substrate piece portion 3a. A concave portion 15a and a convex portion 15b for fitting the blade pieces 4a and 4a to each other are formed.

  Thus, as shown in FIG. 6, if the concave portions 14a and 15a formed on either the blade connecting plate piece portion 5a or the rotating substrate piece portion 3a are engaged with the convex portions 14b and 15b, each blade piece 4a is engaged. The cylindrical completed state can be maintained without temporarily holding 4a, and the positioning of each blade piece 4a, 4a can be facilitated, and the assembly work efficiency can be further improved. In FIG. 6, for the sake of convenience, the fitting state between the concave portion 14a and the convex portion 14b on the blade connecting plate piece portion 5a side is shown in close-up, but as shown in FIG. 7, the rotating substrate piece portion 3a. It goes without saying that the concave portion 15a and the convex portion 15b on the side are similarly fitted.

  Further, by engaging these concave and convex portions (the concave portions 14a and 15a and the convex portions 14b and 15b), it is ensured that when the centrifugal fan 1 is rotated, the blade pieces 4a and 4a are displaced or dispersed apart by the centrifugal force. Can be prevented.

  At this time, the tips of the convex portions 14b and 15b formed on any one of the blade connecting plate piece 5a and the rotating substrate piece 3a are arranged with respect to the fan rotation direction X of the centrifugal fan 1 as shown in FIG. An inclination θ of about 10 [°] to 80 [°] is provided.

  Thus, when each blade piece 4a, 4a is assembled with a reduced diameter, the recess 14a and the projection 14b of the adjacent blade pieces 4a, 4a or the recess 15a and the projection 15b are smoothly fitted so that they slide. And after this fitting, it can be made hard to remove | deviate with respect to the centrifugal direction (namely, fan rotation direction X).

  Moreover, the front-end | tip of these convex parts 14b and 15b has a thickness of 0.5 [mm]-5 [mm]. Thereby, when each blade piece 4a, 4a is reduced in diameter and assembled, the blade pieces 4a, 4a are not locked but smoothly fitted, and the drag force in the centrifugal direction can be exerted at the final fitting position that is the fixed position.

"Method of manufacturing centrifugal fan"
Next, a manufacturing method of the centrifugal fan 1 that realizes the above-described noise reduction will be described with reference to FIGS.

  8 to 10 are perspective views showing a process of assembling a blade piece obtained by dividing the centrifugal fan into each blade into a cylindrical shape.

  Since the centrifugal fan having a general configuration has a shape in which the rectifying pieces 6 are integrated in the blade width direction Y of each blade 4, the rectifying pieces 6 are obstructed when the upper die and the lower die are vertically removed. I can't do it. Therefore, in the present invention, the cylindrical centrifugal fan 1 is formed by dividing the blade 4a into the blade width direction Y for each blade 4, and the plurality of blades 4a are combined to form a cylindrical centrifugal fan. Set to 1.

  First, the blade piece 4a as shown in FIG. 3 or FIG. 4 is formed. The blade piece 4a has a blade connecting plate piece portion 5a constituting a part of the blade connecting plate 5 at an upper end (air inlet side or shroud side) and a rotating substrate piece constituting a part of the rotating substrate 3. A portion 3a is provided at the lower end. Further, a plurality of rectifying pieces 6 are formed on the blade piece 4a between the upper end portion and the lower end portion of the blade piece 4a. The blade connecting plate piece 5a, the rotating substrate piece 3a, and the rectifying piece 6 are formed by being integrally molded with the blade piece 4a.

  The blade connecting plate piece 5 a also serves as an abutting portion between adjacent blade pieces 4 a and has a fan shape in which the annular blade connecting plate 5 is equally divided for each blade 4. And the said recessed part 14a and the convex part 14b which mutually engage are formed in the both sides | surfaces used as the abutting surface of this blade | wing connection plate piece part 5a. The concave portions 14a and the convex portions 14b have, for example, a circular arc shape in a plan view, and as described above, the blade connecting plate pieces 5a are not easily detached from each other when engaged (fitted). Yes.

  In addition, the shape of the said recessed part 14a and the convex part 14b is not restricted to circular arc shape, The reverse triangle shape etc. which exhibit a wedge effect may be sufficient.

  Like the blade connecting plate piece portion 5a, the rotating substrate piece portion 3a also serves as an abutting portion between adjacent blade pieces 4a, and the circular rotating substrate 3 is equally divided into each blade 4 correspondingly. It is said that. And the recessed part 15a and the convex part 15b which mutually engage are formed in the both sides | surfaces used as the abutting surface of this rotation board piece part 3a. The concave portions 15a and the convex portions 15b are substantially the same in shape as the concave portions 14a and the convex portions 14b formed in the previous blade connecting plate piece portion 5a.

  Further, substantially blade-shaped inter-blade piece connection portions 16a and 16b are connected to end portions of the blade connection plate piece portion 5a and the rotary substrate piece portion 3a in the longitudinal direction of the blade 4 (blade width direction Y). It is connected via the part 19. The inter-blade piece connecting portions 16a and 16b are made of a thin metal plate and are connected to the connecting portion 19 by a hinge, and can be folded (openable and closable) around the connecting portion 19. Yes.

Furthermore, apexes other than the apexes of the doglegs where the connecting portions 19 of the inter-blade piece connecting portions 16a and 16b are arranged (in other words, adjacent vane pieces in the inter-blade piece connecting portions 16a and 16b). For example, a rod-shaped fixing portion 17 is provided at the portion of the 4a, 4a), and both ends of the fixing portion 17 in the blade width direction Y (see FIG. 3 or 4) are made of, for example, metal. A guide pin 18 is projected. (Incidentally, these inter-blade piece connecting portions 16a and 16b, the fixing portion 17 and the connecting portion 19 are inter-blade piece connecting means.)
On the other hand, the rectifying piece 6 also has a fan shape in which the disk shape is equally divided for each blade 4 as well as the abutting portion between the adjacent blade pieces 4a, similarly to the blade connecting plate piece portion 5a. Yes. In the present embodiment, the centrifugal fan 1 has five rectifying pieces 6 attached thereto.

  Thus, the blade piece 4a in which the blade connecting plate piece 5a, the rotating substrate piece 3a, and the rectifying piece 6 are integrated with the blade 4 is formed by, for example, injection molding. In the injection molding, the entire centrifugal fan 1 cannot be molded at a time, but the wing piece 4a can be easily manufactured by using the rectifying piece 6 thus divided.

  Further, after a pair of blade-piece connecting portions 16a and 16b, to which the fixing portion 17 is attached, are arranged at predetermined intervals on the insert molding die, the connecting portions provided on the blade-tip connecting portions 16a and 16b are arranged. If the blade piece 4a is insert-molded so as to be integrated with the installation portion 19, these blade-piece connecting portions 16a, 16b and the blade piece 4a need not be connected one by one and can be connected at a time. . Therefore, the production time can be greatly shortened, so that the production capacity is greatly increased. Further, when each blade piece 4a is insert-molded integrally with the blade-piece connecting portions 16a, 16b and the fixing portion 17 in this way, it is possible to proceed to an assembly process continuously after injection molding.

  Next, the blade pieces 4a, 4a thus injection-molded are slid by engaging the guide pins 18 arranged at both ends of the fixed portion 17 with the guide grooves 22 formed in the rail 21 of the assembly device 20. Move. The rail 21 has a circular structure as it proceeds from the straight line.

  And as shown in FIG. 9, each blade piece 4a, 4a is advanced to the tip of the rail 21 by using the guide pin 18 as a fulcrum. At this time, the guide pins 18 on both sides provided in front of the leading blade piece 4a are picked, and the blade connecting portions 16a and 16b are slid. Then, the portion of the connecting portion 16a, 16b between the blade pieces is folded and the opposing distance is reduced, so that each blade piece 4a, 4a is inevitably cylindrical as shown in FIG. Form. When the cylindrical shape is obtained, the cylindrical body is pressed by hand. Then, the wing pieces 4a and 4a that are cylindrical bodies are formed by fitting the concave portions 14a and the convex portions 14b of the blade connecting plate piece portion 5a and / or the concave portions 15a and the convex portions 15b of the rotating substrate piece portion 3a. It retains its cylindrical shape without being scattered.

  And the several adjacent blade piece 4a is fixed integrally. As the fastening means, for example, bonding by bonding, bonding by ultrasonic waves, coalescence by a combination of concaves and convexes, coalescence by a resin band 13 or the like can be adopted, but in this embodiment, the wing pieces 4a and 4a that are cylindrical bodies are joined together. Fastened by an annular resin band 13.

  Then, finally, the blades 4a, 4a and the connecting portion 19 are separated from each other, whereby the centrifugal fan 1 as shown in FIG. 1 is formed.

  As described above, in the present embodiment, the blade connecting plate piece 5a constituting a part of the blade connecting plate 5 at the upper end and the rotating board piece constituting the part of the rotating substrate 3 at the lower end. A plurality of blade pieces 4a integrally formed with 3a slides guide pins 18 projecting from a fixed portion 17 which is one of blade connecting means along a guide groove 22 having a circular shape. Then, the interval between the plurality of blade pieces 4a, 4a can be gradually reduced to form a cylindrical body. Thereafter, at least one of the blade connecting plate piece portion 5a side and the rotating substrate piece portion 3a side is attached to the resin band 13 , 30 are integrally fastened (fixed), so that the guide pin 18 can perform processing positioning to accurately control the interval and direction of each blade piece 4a, 4a, and the assembly accuracy is high. And assy Lance minimal, assembled strength of the centrifugal direction can be improved.

  In addition, since the guide pins 18 may be pulled manually or automatically using other means, the conveyance can be simplified.

  Accordingly, the centrifugal fan 1 can be easily manufactured by simply assembling each blade piece 4a by sliding the guide pin 18 in the guide groove 22, and the assembling workability can be greatly improved.

  In addition, since the fixing portions 17 of the blade connecting means can prevent the blades 4a and 4a arranged in parallel from being twisted, handling during assembly work can be speeded up quickly and complicated. It can be prevented in advance.

  Thus, a method of manufacturing a centrifugal fan that can be easily manufactured even with a structure in which the rectifying piece 6 and the like that have excellent assembly workability and exhibit noise suppression effects are formed on the blade surface, and the centrifugal fan manufactured thereby 1 can be realized.

  Further, if the concave portions 14a and 15a formed in either the blade connecting plate piece portion 5a or the rotating substrate piece portion 3a and the convex portions 14b and 15b are engaged (fitted), the blade pieces 4a and 4a are connected to each other. Even if it is not temporarily held, it is possible to hold the completed state of the cylindrical shape, and it is possible to easily align the wing pieces 4a and 4a, and it is possible to further improve the assembly work efficiency. In addition, by engaging these concave and convex portions 14a, 15a, 14b, and 15b, it is possible to reliably prevent the blade pieces 4a and 4a from being displaced due to the centrifugal force during the rotation of the centrifugal fan 1 or from being scattered apart. it can.

  Further, the convex portions 14b and 15b formed on either the blade connecting plate piece portion 5a or the rotating substrate piece portion 3a are inclined at 10 [°] to 80 [°] with respect to the fan rotation direction X of the centrifugal fan 1. As a result, when the blades 4a and 4a are assembled with a reduced diameter, the recesses 14a and 15a and the protrusions 14b and 15b of the adjacent blades 4a and 4a fit smoothly so that they slide. And after this fitting, it can be made hard to remove | deviate with respect to the centrifugal direction (namely, fan rotation direction X).

  In addition, by having a thickness of 0.5 [mm] to 5 [mm] at the tip of the convex portions 14b, 15b, when fitting with a reduced diameter, it does not lock and fits smoothly, In the final fitting position that is the fixed position, it is possible to exert a drag force in the centrifugal direction.

  Further, since each blade piece 4a, 4a is provided with the blade connecting plate piece 5a on the pressure surface side in the fan rotation direction X, when the blade piece 4a is formed, the blade connecting plate piece 5a becomes the pressure surface. Since the rectifying piece 6 and the rotating substrate piece portion 3a are on the suction surface side, the blade piece can be easily formed by removing the front and rear of the mold, and the target performance can be prevented from being lowered.

  Further, by providing the rotating substrate piece 3a on the suction surface side, the forward-facing fan can easily form a circumferential shape and a warped shape on the inlet side, so that a decrease in performance can be suppressed and fluidized. The shape, that is, the shape that can achieve the effect of noise reduction can be finished.

In addition to these, since the blade piece 4a has the blade connecting plate piece portion 5a on the pressure surface side in the fan rotation direction X and the rotating substrate piece portion 3a on the negative pressure surface side, the blade piece 4a has a crank shape. In addition, it is possible to obtain an advantage that the joining property between the adjacent blade pieces 4a and 4a can be dispersed and strengthened in the blade width direction Y.
Further, since the resin bands 13 and 30 are provided on both sides of the blade connecting plate piece 5a side and the rotating substrate piece 3a side, each blade piece 4a and 4a is assembled into a cylindrical body, and then the cylinder is formed. The body shape can be reliably held. In addition, since the fastening force becomes strong and the shape can be stabilized, the effect of preventing scattering against centrifugal force can be further improved.

  Further, since the fastening groove 5b of the resin band 13 is formed in the blade connecting plate piece 5a, it is possible to prevent the resin band 13 from being displaced or detached by centrifugal force.

  Further, since the rectifying piece 6 is integrally formed between the upper end portion and the lower end portion of the blade piece 4a, if each of the blade pieces 4a, 4a is assembled into a cylindrical body, the flow path between the blades 4, 4 is set to the blade width. Separation vortices generated in the flow path between the blades 4 and 4 that have been divided in the direction Y (longitudinal direction of the blades) to suppress the amplification of oscillation generated on the rotating substrate 3 side when air flows in The rectifying piece 6 is obtained in which the disturbance in the blade width direction Y is segmented.

  Furthermore, a plurality of blade pieces 4a and 4a having blade connecting plate piece 5a and rotating substrate piece 3a, blade piece connecting portions 16a and 16b for connecting these blade pieces 4a and 4a, fixed portion 17 and connecting portion 19 can be integrally formed by insert molding, so that it is possible to move from the blade piece molding to the assembly process continuously, so that it is possible to save the trouble of collecting the blade pieces 4a and fitting them in a predetermined position. The wing pieces 4a and 4a and the wing piece connecting means (the wing piece connecting portions 16a and 16b, the fixing portion 17 and the connecting portion 19) are integrally formed. Therefore, the number of parts can be reduced. In addition, any complicated wing shape can be formed as long as the shape is not shaded in two dimensions.

  In addition, compared with the case where the entire centrifugal fan 1 is molded by a mold, the molding mold for molding the blade piece 4a is not enlarged, and it is easy to change the shape by simply replacing individual molds (nesting). The blade piece 4a can be manufactured. In particular, in the centrifugal fan 1 that does not require the rectifying piece 6, the shape of the blade piece 4a is simplified, so that the molding time is fast and high-speed molding is possible.

  As mentioned above, although one Embodiment of the manufacturing method of the centrifugal fan to which this invention is applied was described, various changes are possible for this invention, without being restrict | limited to the above-mentioned embodiment.

  For example, the centrifugal fan 1 according to the above-described embodiment has a structure including the rectifying piece 6, serrations 7 and 10, protrusions 8 and 11, and through holes 9 and 12 for the purpose of further reducing noise. However, the present invention can also be applied to the manufacture of the centrifugal fan 1 that does not include the rectifying piece 6, the serrations 7 and 10, the protruding portions 8 and 11, the through holes 9 and 12, and the like. In this case, the blade piece 4a has a very simple form having the blade connecting plate piece portion 5a at the upper end portion and the rotating substrate piece portion 3a at the lower end portion.

  Further, in the above-described embodiment, the rectifying piece 6 is not formed with any uneven part in the fan rotation direction, but the rectifying piece 6 is also formed on the blade connecting plate piece part 5a and the rotating substrate piece part 3a. You may form the same convex part and recessed part as what was done. In this case, it is possible to further increase the engagement strength between the adjacent blade pieces 4a, 4a.

  Further, in the above-described embodiment, the case where the annular resin band 13 is used as the fastening means and the wing pieces 4a and 4a that are cylindrical bodies are fastened together is described, but the present invention is not limited thereto. Alternatively, for example, bonding may be performed, or the ultrasonic device 35 having the upper horn 33 and the lower horn 34 as illustrated in FIG.

  Further, as shown in FIG. 12, the rotating substrate piece 3 a is provided with an engaging protrusion 15 c for directly or indirectly engaging with the rotor 2 for rotating the rotating substrate 3 via the fixed flange 30. You may be made to do. When the fixing flange 30 is interposed, the engaging protrusion 15 c of the rotating board piece 3 a is engaged with an engaging groove 31 provided in the fixing flange 30. As a result, it is possible to obtain an advantage of minimizing shaft shake when the centrifugal fan 1 rotates.

  Further, as shown in FIG. 13, when the guide groove 41 of the assembling apparatus 40 is of a spiral shape (spiral shape), a plurality of rods 43 attached radially to the rotation shaft 42 are rotated around the rotation shaft 42. By moving the guide pin 18 engaged with the tip of the rod 43 along the spiral guide groove 41, the blade pieces 4a and 4a connected to the blade-piece connecting portions 16a and 16b are moved. The diameter is reduced to a cylindrical shape.

It is a perspective view of the centrifugal fan by this Embodiment. It is sectional drawing which fractures | ruptures and shows the principal part of the centrifugal fan in FIG. It is an expansion perspective view when the blade piece formed by dividing the centrifugal fan in FIG. 1 for each blade is viewed from one side. It is an expansion perspective view when the blade piece formed by dividing the centrifugal fan in FIG. 1 for each blade is viewed from the other. It is a perspective view which fractures | ruptures and shows a part of centrifugal fan in FIG. It is a principal part expansion perspective view of a mode that the blade piece formed by dividing | segmenting the centrifugal fan in FIG. 1 for every blade was engaged. It is a principal part enlarged plan view which shows the fitting part of the recessed part and convex part which were formed in the rotation board piece part. It is a perspective view which shows the process of assembling the blade piece formed by dividing | segmenting a centrifugal fan for every blade. It is a perspective view which shows the process of assembling the blade piece formed by dividing | segmenting a centrifugal fan for every blade. It is a perspective view which shows the process of assembling the blade piece formed by dividing | segmenting a centrifugal fan for every blade. It is a principal part expansion perspective view which shows the example which joins each wing piece and assembles to a cylindrical body with an ultrasonic device. It is an expansion perspective view of the blade piece formed by dividing | segmenting the blade | wing of the centrifugal fan by other embodiment. It is a perspective view which shows the centrifugal fan assembly apparatus by other embodiment. It is the principal part perspective view which simplified and showed the example which manufactures the conventional centrifugal fan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Centrifugal fan 3 ... Rotating board 3a ... Rotating board piece 3b ... Fastening groove 4 ... Blade 4a ... Blade piece 5 ... Blade connection plate 5a ... Blade connection plate piece 5b ... Fastening groove (rib prevention rib)
6 ... Rectifying piece 7, 10 ... Serration 8, 11 ... Protruding portion 9, 12 ... Through hole 13 ... Resin band (fastening means)
14b, 15b ... convex part 14a, 15a ... concave part 16a, 16b ... inter-blade connecting part 17 ... fixing part 18 ... guide pin 19 ... connecting part 20 ... assembly device 21 ... rail 22 ... guide groove 30 ... fixing flange (fastening) means)
31 ... Fastening groove 33 ... Upper horn 34 ... Lower horn 35 ... Ultrasonic device

Claims (10)

A circular rotating substrate (3), a large number of blades (4) erected at substantially equal intervals on the periphery of the rotating substrate (3), and an upper end portion of the large number of blades (4) are integrated. At least an annular blade connection plate (5) formed on the upper surface, and a blade connection plate piece (5a) constituting a part of the blade connection plate (5) at the upper end. 3) A plurality of blade pieces (4a) having a rotating substrate piece portion (3a) constituting a part of 3) at the lower end, and each blade connecting plate piece portion (5a) and rotating substrate piece portion (3a) After assembling each other into a cylindrical body, a method of manufacturing a centrifugal fan (1) for integrally fixing the plurality of blade pieces (4a),
A pair of wing piece connecting portions (a pair of continuously formed wing pieces (4a) are connected to each other so that the distance between the upper end portions and the distance between the lower end portions are variable) 16a), (16b), and a blade piece connecting means having a fixed portion (17) for integrally connecting the blade piece connecting portions (16a), (16b),
A plurality of guide blades (18) projecting from the upper and lower ends of the fixed portion (17) in the blade-piece connecting means are slid along circular guide grooves (22) so that a plurality of the blades are provided. After the interval between the pieces (4a) is gradually reduced to form a cylindrical body, at least one of the blade connecting plate piece (5a) side and the rotating substrate piece (3a) side is fastened with fastening means (13, 30). The method of manufacturing a centrifugal fan, characterized in that: It is a manufacturing method of the centrifugal fan of Claim 1, Comprising:
When assembling each of the blade pieces (4a) into a cylindrical body, at least one of the blade connecting plate piece portion (5a) and the rotating substrate piece portion (3a) is provided with convex portions (14b), (15b) and concave portions. (14a), (15a) are engaged. The manufacturing method of the centrifugal fan characterized by the above-mentioned. It is a manufacturing method of the centrifugal fan of Claim 2, Comprising:
The protrusions (14b) and (15b) are inclined at 10 [°] to 80 [°] with respect to the fan rotation direction (X) of the centrifugal fan (1), and 0.5 [mm] to 5 [mm]. ] A method of manufacturing a centrifugal fan, wherein A method for manufacturing a centrifugal fan according to any one of claims 1 to 3, comprising:
Each blade piece (4a) is provided with the blade connecting plate piece portion (5a) on the pressure surface side in the fan rotation direction (X) and the rotating substrate piece portion (3a) on the negative pressure surface side. A method for manufacturing a centrifugal fan. A method for producing a centrifugal fan according to any one of claims 1 to 4, comprising:
The method of manufacturing a centrifugal fan, wherein the fastening means (13, 30) is provided on both sides of the blade connecting plate piece (5a) side and the rotating substrate piece (3a) side. It is a manufacturing method of the centrifugal fan of Claim 1 or Claim 5, Comprising:
The blade connecting plate piece (5a) is provided with a rib (5b) for preventing the fastening means (13) from coming off. It is a manufacturing method of the centrifugal fan of Claim 1 or Claim 5, Comprising:
The rotating substrate piece (3a) has an engaging protrusion (directly engaged with the rotor (2) for rotating the rotating substrate (3) directly or indirectly via the fastening means (30). 15 c) is provided. A method of manufacturing a centrifugal fan, A method for producing a centrifugal fan according to any one of claims 1 to 7, comprising:
Each wing piece (4a) has a rectifying piece (6) extending in the fan rotation direction (X) of the centrifugal fan (1) between adjacent wings (4). ), And rectifies each rectifying piece (6) and wing piece (4a) and assembles them into a cylindrical body. A method for producing a centrifugal fan according to any one of claims 1 to 8, comprising:
The method for manufacturing a centrifugal fan, wherein the blade piece (4a) and the blade piece connecting means are integrally formed by injection molding. A circular rotating substrate (3), a large number of blades (4) erected at substantially equal intervals on the periphery of the rotating substrate (3), and an upper end portion of the large number of blades (4) are integrated. A centrifugal fan (1) comprising at least an annular blade connecting plate (5) formed in
The upper end portion has a blade connecting plate piece (5a) constituting a part of the blade connecting plate (5) and the lower end portion of the rotating substrate piece (3a) constituting a part of the rotating substrate (3). After assembling a plurality of blade pieces (4a) in the cylindrical body by abutting each blade connecting plate piece portion (5a) and rotating substrate piece portion (3a), the plurality of blade pieces ( A centrifugal fan characterized by integrally fixing 4a).

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