JP4695687B2 - Impeller, fan device, and impeller manufacturing method - Google Patents

Description

  The present invention relates to an impeller having a substantially annular connecting member that connects a plurality of blades, a fan device, and a method for manufacturing the impeller.

  As the impeller rotates, centrifugal force acts on the blade itself. Centrifugal force is generated substantially parallel to the radial direction when viewed from the root of the blade support. An impeller that rotates at high speed needs to be designed with strength in consideration of the stress generated at the base of the wing by centrifugal force. Further, there is a concern that the blade is deformed by the influence of centrifugal force and the radially outer end of the blade is displaced radially outward. If the radially outer end of the blade is displaced radially outward, the radially outer end of the blade may come into contact with the inner surface of the outer frame that surrounds the impeller. As an effective measure against the influence of this centrifugal force, for example, Patent Documents 1 to 7 disclose a substantially annular connecting member that connects blades.

  Further, the impeller is often manufactured by injection molding from the viewpoint of manufacturing cost and mass productivity. As a mold for injection molding, a set of molds that are released in the central axis direction of the impeller is used. The one set of molds is composed of, for example, a fixed mold and a movable mold.

  At least one of these sets of molds is provided with a movable part (sometimes called an ejector pin) that is provided so as to be able to advance and retreat in the direction of the central axis and push the impeller out of the mold. The impeller after molding is separated from the mold by the movable part. The arrangement of the movable part with respect to the mold is determined in consideration of the shape of the impeller, the distribution of the close contact portion where the impeller and the mold are in close contact, and the like.

  Further, since the impeller is pushed out of the mold by the movable portion, it is performed in a state before the injection-molded resin material is completely cured, so that the impeller portion pressed by the movable portion is deformed (including an indentation). The same may occur. For this reason, as a part of the impeller that receives the movable part, a part that is likely to be deformed or a part that is liable to be deteriorated in fluid characteristics due to the deformation, such as a wing, is avoided, and a support part in the center of the impeller can be avoided. There are many cases.

  In the case of an impeller having a connecting member for connecting a plurality of blades as described above, a substantially annular connecting member is provided on the radially outer side of the blade, so that the impeller and the mold on the radially outer side of the impeller There is an increase in the close contact area. For this reason, in order to facilitate mold release after injection molding, a receiving part for the movable part of the mold is additionally provided in the part of the connecting member, or a receiving part for the moving part is used instead of the supporting part. It is necessary to provide in the part. As a result, the connecting member is required to have enough strength to withstand the pressing by the movable part.

The receiving part of the movable part provided in the connecting member is provided on at least one of the two surfaces facing both sides of the impeller in the central axis direction of the impeller. For this reason, as a structure for improving the intensity | strength with respect to the press by the movable part of a connection member, the structure which increased the thickness of the radial direction of the connection member in the whole circumferential direction can be considered, for example. However, when the radial thickness of the entire connecting member is increased, the degree of interference between the air flow generated by the blade and the connecting member increases, and the fluid characteristics of the impeller deteriorate. Further, when the thickness of the connecting member increases, the mass of the impeller increases, the torque required to rotate the impeller increases, and the efficiency reduction decreases.
US Design Patent No. D511824 US Patent Application Publication No. 2008/0056899 US Pat. No. 6,554,574 US Pat. No. 4,684,324 U.S. Pat. No. 4,569,631 U.S. Pat. No. 4,569,632 US Pat. No. 6,241,474

  Therefore, the problem to be solved by the present invention is that an impeller provided with a substantially annular connecting member for connecting a plurality of blades is connected by pressing at the time of mold release by a movable part provided in a mold for injection molding. An object of the present invention is to provide an impeller, a fan device, and a method of manufacturing an impeller that can prevent deformation of the member and can suppress deterioration in fluid characteristics and increase in mass due to an increase in radial thickness.

  In order to solve the above problems, in the impeller of the present invention, a support portion having a cylindrical outer surface centered on a central axis, and radially outward from the cylindrical outer surface of the support portion. A plurality of blades that are formed by stretching and rotate around the central axis together with the support portion, and are formed along a circumferential direction centered on the central axis; The support unit, the plurality of blades, and the connecting member are continuous with each other, having two surfaces facing both sides in the central axis direction, and a substantially annular connecting member that connects the plurality of blades. The resin member is integrally formed, and at least one of the two surfaces of the connecting member is provided with at least one widened portion obtained by partially expanding the radial width of the surface. .

  In the above-described impeller according to the present invention, the widened portion is disposed at any position in the overlapping section overlapping the wing on the surface of the connecting member provided with the widened portion when viewed from the central axis direction. be able to.

  In this case, the widened portion is the first of the first and second ends on both sides in the circumferential direction of the overlapping section, which has a larger distance along the central axis direction between the end and the wing. It is good to arrange at any position between the end and an intermediate position in the circumferential direction of the overlapping section.

  In particular, the widened portion is disposed between the first end of the overlapping section and the intermediate position at a position closer to the first end than the intermediate position with respect to the circumferential direction. Is even better.

  Further, in the impeller according to the present invention described above, the widened portion is arranged along the central axis direction of the end and the blade among the first and second ends on both sides in the circumferential direction of the overlapping section. You may make it arrange | position in the vicinity of the 1st end with a larger distance.

  In the impeller according to the present invention, it is preferable that the widened portion is disposed in each of the plurality of overlapping sections obtained corresponding to the plurality of blades.

  In the above-described impeller according to the present invention, the widened portion is provided so as to be able to advance and retreat in a mold for molding the resin member, and forms a receiving portion of a movable portion that pushes the resin member from the mold. it can.

  In order to solve the above problems, in the fan device of the invention, the impeller according to the invention described above, a motor that drives the impeller, an outer frame body that surrounds the impeller, and a diameter of the outer frame body And a support body that is provided inward in the direction and supports the motor.

  In order to solve the above problems, in the impeller manufacturing method of the present invention, a support portion having a cylindrical outer surface centered on a central axis, and a radial direction from the cylindrical outer surface of the support portion A plurality of blades that are formed to extend outward and rotate around the central axis together with the support portion, and in a circumferential direction centered on the central axis by generating airflow in the central axis direction. Two surfaces facing each other on both sides in the central axis direction, and a substantially annular connecting member for connecting the plurality of blades, and the two surfaces of the connecting member An impeller manufacturing method in which at least one of the at least one widened portion formed by partially expanding the radial width of the surface is provided on at least one of the surfaces, and a set of molds released in the central axis direction Resin is injected into the closed space formed by the mold. The step of integrally forming the support portion of the impeller, the plurality of blades and the connecting member as a continuous resin member, and releasing the mold in the central axis direction, And a step of pushing out the widened portion of the connecting member of the resin member in a direction away from the mold by a movable portion provided to be movable back and forth in the central axis direction.

  According to the impeller of the present invention, at least one of the two surfaces on both sides in the central axis direction of the impeller in the substantially annular connecting member that connects the plurality of blades partially has a radial width of the surface. At least one widened portion is provided which is enlarged. Therefore, when the impeller support section, the plurality of blades and the connecting member are molded by injection molding using a pair of molds that are released in the direction of the central axis, the widened portion of the connecting member is made of a molded product. It can be a receiving part of a movable part provided in the mold for separating from the mold. In the widened portion of the connecting member, since the radial width is partially enlarged and the strength is improved, it is possible to avoid the deformation of the connecting member due to the pressing at the time of releasing by the movable portion. Moreover, since at least one of the two surfaces of the connecting member partially enlarges the radial width of the surface to form a widened portion, the fluid characteristics of the connecting member due to an increase in radial thickness. It is also possible to suppress the deterioration and mass increase.

  In the impeller, if the widened portion is arranged at a position overlapping the blades on the surface of the connecting member, the resin member constituting the impeller support portion, the plurality of blades and the connecting member is molded by the movable portion after the injection molding. When being pushed away from each other, the blades and the connecting members can be easily separated without causing deformation. That is, since the wing portion has a large contact area with the mold, when the connecting member is pressed by the movable portion of the mold and the resin member is separated from the mold, a load is applied to the joint portion between the resin member and the wing. Easy to take. In the present invention, since the widened portion is disposed at any position in the overlapping section overlapping with the wings on the surface of the connecting member provided with the widened portion when viewed from the central axis direction, the connecting member is moved by the movable portion of the mold. The portion that is connected to the wings of the resin can be pressed to separate the resin member from the mold. As a result, when the resin member is pushed away from the mold by the movable part, the resin member can be easily separated without causing deformation of the wing and the connecting member.

  Here, the impeller blades are inclined with respect to a plane perpendicular to the central axis direction when the blade is cut along a plane perpendicular to the extending direction of the blades. For this reason, the distance along the center axis direction from the said surface to a wing | blade changes with the circumferential position in the said overlap area of the said surface in which the wide part of a connection member is provided. Accordingly, the degree of close contact between the portion on the radially inner side surface or the outer side surface of the connecting member corresponding to the overlapping section and the mold on which the movable portion is provided also varies depending on the circumferential position in the overlapping section. However, the greater the distance along the central axis direction from the surface to the wing, the greater the degree of adhesion.

  In the present invention, the widened portion of the first and second ends on both sides in the circumferential direction of the overlapping section, the first end having a larger distance along the central axis direction between the end and the wing, If it is disposed at any position between the intermediate position with respect to the circumferential direction of the overlapping section, in the overlapping section of the connecting member, the radially inner side surface or the outer surface portion of the connecting member corresponding to the overlapping section; The receiving part of the movable part can be provided at a portion where the degree of close contact with the mold provided with the movable part is large. As a result, when the resin member is pushed away from the mold by the movable portion, the resin member can be easily separated while preventing the wing and the connecting member from being deformed more reliably.

  In particular, the widened portion is configured to be disposed at a position closer to the first end than the intermediate position in the circumferential direction between the first end and the intermediate position of the overlapping section. Then, among the overlapping sections in the connecting member of the impeller, a portion having a higher degree of adhesion between the radially inner side surface or the outer side surface of the connecting member corresponding to the overlapping section and the mold on which the movable portion is provided A receiving part for the movable part can be provided. As a result, when the resin member is pushed away from the mold by the movable part, the resin member can be easily separated while further reliably preventing deformation of the wing and the connecting member.

  Further, in the present invention, the widened portion is a first end having a larger distance along the central axis direction between the end and the wing among the first and second ends on both sides in the circumferential direction of the overlapping section. In the overlapping section of the impeller connecting member, the radially inner side surface or the outer surface portion of the connecting member corresponding to the overlapping section and the mold provided with the movable portion A receiving part for the movable part can be provided in the vicinity of the part having the greatest degree of adhesion. As a result, when the resin member is pushed away from the mold by the movable part, the resin member can be easily separated while further reliably preventing deformation of the wing and the connecting member.

  Further, in the present invention, when the widened portion is arranged in each of the plurality of overlapping sections obtained corresponding to all the blades, when the resin member is pushed away from the mold by the movable portion, all With respect to the wing, the resin member can be easily separated while more reliably preventing the wing and the joint between the wing and the connecting member from being deformed.

  In the impeller of the present invention described above, if the widened portion forms a receiving part of the movable part of the molding die, the impeller provided with a substantially annular connecting member for connecting a plurality of blades is used for injection molding. It is possible to avoid the deformation of the connecting member due to the pressing at the time of releasing by the movable part provided in the mold, and it is possible to suppress the deterioration of the fluid characteristics and the increase of the mass of the connecting member due to the increase in the radial thickness.

  According to the fan device of the present invention, the above-described impeller is prevented from being deformed in the substantially annular connecting member that connects the plurality of impeller blades due to extrusion by the movable portion of the mold after injection molding. Since the deterioration of the fluid characteristics and the increase in mass of the connecting member due to the increase in the radial thickness are suppressed, an air flow can be generated stably and efficiently.

  Furthermore, according to the impeller manufacturing method of the present invention, at least one of the two surfaces on both sides in the central axis direction of the impeller in the substantially annular connecting member that connects the plurality of blades is arranged in the radial direction of the surface. At least one widened portion having a partially enlarged width is provided. In addition, when the impeller support portion, the plurality of blades, and the connecting member are molded by injection molding using a set of molds that are released in the central axis direction, the widened portion of the connecting member is used to mold the molded product. It is a receiving part of the movable part provided in the mold in order to be separated from the mold. Therefore, in the widened portion of the connecting member, since the radial width is partially enlarged and the strength is improved, it is possible to avoid the deformation of the connecting member due to the pressing at the time of releasing by the movable portion. In addition, since at least one of the two surfaces of the connecting member partially enlarges the radial width of the surface to form a widened portion, the fluid of the connecting member due to an increase in the radial thickness. The deterioration of characteristics and the increase in mass can also be suppressed.

  FIG. 1 is a perspective view of an impeller 1 according to an embodiment of the present invention as viewed from the intake side in the direction of the central axis 17, FIG. 2 is a side view of the impeller 1 of FIG. 1, and FIG. FIG. 4 is an enlarged view of a part of FIG. 3, and FIG. 5 is a view of the rotor blade 22 and the connecting member 23 in the impeller 1 of FIG. 1. FIG. 6 is a cross-sectional view of the fan device 11 in which the impeller 1 of FIG. 1 is used.

  As shown in FIG. 6, the fan device 11 using the impeller 1 according to the present embodiment includes the impeller 1, a plurality of stationary blades 12, a motor 13, an outer frame body 14, and a support body 15. ing. The stationary blade 12, the outer frame body 14, and the support body 15 constitute a housing 16 of the fan device 11. In the present embodiment, the stationary blade 12 and the support 15 are provided on the exhaust side of the impeller 1 in the direction of the central axis 17 (the lower side in FIG. 6).

  The outer frame body 14, the support body 15, and the stationary blade 12 are integrally formed as a continuous resin member by injection molding. A mold generally used for injection molding is mainly composed of two mold members, a movable mold and a fixed mold which are separated from the housing 16 in the direction of the central axis 17. As a result, the fan device 11 can be mass-produced at low cost.

  The outer frame body 14 is provided so as to surround the impeller 1. The support 15 is provided inward of the outer frame 14 in the radial direction, and supports the motor 13 and a circuit board (not shown) that constitutes a drive circuit for driving the motor 13.

  The stationary blade 12 connects the outer frame body 14 and the support body 15, has a wind receiving surface that extends radially outward from the support body 15 and inclines with respect to the direction of the central axis 17. Yes. The role of the stationary blade 12 is to collect the air flow generated by the rotation of the impeller 1 toward the central shaft 17, and to generate the generated air flow radially inward or radially outward. Pointing in any direction. Such a stationary blade 12 is provided on the exhaust side of the impeller 1 in the direction of the central axis 17 so as to efficiently collect air or change the direction of the air generated by the impeller 1. As a modification, the stationary blade 12 may be provided on the intake side in the direction of the central axis 17 of the impeller 1.

  The motor 13 includes a rotor magnet 18 attached to an inner surface of a support portion 21 described later of the impeller 1, and an armature 19 that generates torque between the rotor magnet 18. Such a motor 13 is accommodated in the support portion 21 of the impeller 1.

  As shown in FIGS. 1 to 5, the impeller 1 includes a support portion 21, a plurality of (for example, seven) moving blades 22, and a connecting member 23. The support portion 21 has a cylindrical outer surface 21 a centering on the central axis 17. In the present embodiment, the support portion 21 has a substantially cup shape centered on the central shaft 17, and the motor 13 is accommodated inside the support portion 21.

  The plurality of moving blades 22 are formed to extend radially outward from the cylindrical outer surface 21a of the support portion 21 with a space in the circumferential direction around the central axis 17. The plurality of moving blades 22 rotate in the rotation direction 20 around the central axis 17 together with the support portion 21 to generate an air flow in the direction of the central axis 17. In the present embodiment, the air flow sucked from the upper side in FIG. 1 and FIG. 2 (center axis 17 direction intake side) is discharged to the lower side (center axis 17 direction exhaust side) of FIG. 1 and FIG. For this reason, the moving blade 22 has the extending direction of the moving blade 22 so that the front edge 22a in the rotation direction 20 of the moving blade 22 is located closer to the intake side in the direction of the central axis 17 than the rear edge 22b in the rotation direction 20. The cross-sectional shape when the moving blade is cut on a vertical plane is inclined with respect to the plane perpendicular to the central axis 17.

  Further, in the present embodiment, a forward moving blade is adopted as the moving blade 22, and the moving blade 22 moves forward in the rotational direction 20 as it moves away in the radial direction from the root of the support portion 21 on the radially inner side. Is greatly curved. By adopting such a forward moving blade, the air flow generated by the moving blade 22 can be sent out while being prevented from spreading radially outward.

  The connecting member 23 is a substantially annular member provided to reinforce the moving blade 22 against the influence of centrifugal force. The connecting member 23 is formed along the circumferential direction around the central axis 17, and connects the moving blades 22 to each other. Link. More specifically, the connecting member 23 has a substantially cylindrical shape extending along the central axis 17, and the radial direction between the radially inner end and the radially outer end of each rotor blade 22. It is combined with the outer side part.

  The impeller 1 is integrally formed as a continuous resin member by injection molding. For injection molding of the impeller 1, as shown in FIGS. 7A to 7C, a pair of molds 31 and 32 that are released in the direction of the central axis 17 are used. One of the molds 31 and 32 is a fixed mold that is fixed at a predetermined installation position, and the other is a movable mold that approaches and separates from the fixed mold in the direction of the central axis 17. It has become. The molds 31 and 32 are often configured by incorporating a plurality of mold elements (nesting) into a base mold.

  Further, at least one of the molds 31 and 32 is provided so as to be able to advance and retreat in the direction of the central axis 17 from the inner surfaces of the molds 31 and 32, and a movable part (ejector) that pushes the impeller 1 from the molds 31 and 32 after injection molding. 33 (sometimes called pins). The movable portion 33 is driven in conjunction with the movement of the movable mold of the molds 31 and 32 in the direction of the central axis 17. In the illustrated example of FIGS. 7A to 7C, the movable portion 33 is provided in the mold 32. Below, it demonstrates based on this example of illustration.

  As shown in FIG. 7A, when the molds 31 and 32 are brought into contact with each other and the closed space 34 into which the resin material is injected is formed by the molds 31 and 32, the movable portion 33 has the tip thereof. The surface 33 a is set at a position where it is aligned with the inner surface of the mold 32 that forms the closed space 34. In this state, as shown in FIG. 7B, the resin material is injected into the closed space 34, and the impeller 1 is thereby molded. Subsequently, as shown in FIG. 7C, the movable portion 33 is moved to the mold in conjunction with the movement of the movable mold of the molds 31 and 32 in the direction away from the fixed mold. It is displaced in a direction protruding from the inner surface of 32. As a result, the impeller 1 is pushed away from the mold 32 by the movable portion 33, and the impeller 1 and the mold 32 are released.

  As described above, the impeller 1 is pushed out from the mold 32 by the movable portion 33 before the injection-molded resin material is completely cured, so that it is deformed into the portion of the impeller pressed by the movable portion 33. May occur. For this reason, it is necessary to avoid the portion of the impeller 1 that receives the movable portion 33, and the portion of the rotor blade 22 that is likely to be deformed by the pressing of the movable portion 33 and that is liable to deteriorate the fluid characteristics due to the deformation.

  Moreover, also in the impeller 1 according to the present embodiment, since the connecting member 23 is provided, the contact portion between the impeller 1 and the dies 31 and 32 on the radially outer side of the impeller 1 is increased. For this reason, in order to facilitate mold release after injection molding, the receiving of the movable part 33 of the mold 32 is provided in the connecting member 23 part, or both the support part 21 part and the connecting member 23 part are provided. It is necessary to provide in.

  Therefore, in the present embodiment, as shown in FIGS. 3 to 4, at least one widened portion is provided on at least one of the two surfaces 26 and 27 facing both sides of the connecting member 23 in the direction of the central axis 23. 28 is provided, and the receiving portion of the movable portion 33 is formed by the widened portion 28. The widened portion 28 is formed by partially enlarging the radial width of the surfaces 26 and 27. In the present embodiment, the widened portion 28 is provided on the surface 27 of the two surfaces 26 and 27 of the connecting member 23 that faces the side where the support portion 21 opens. As a modification, the widened portion 28 may be provided on the surface 26 instead of being provided on the surface 27, or may be provided on both the surfaces 26 and 27.

  In the widened portion 28 on the surface 27 of the connecting member 23, the radial width is partially enlarged and the strength is improved. Therefore, the connecting member 23 is deformed by the pressing at the time of releasing by the movable portion 33. Can be avoided. In addition, since the widened portion 28 is formed by partially expanding the radial width of the surface 27 on the surface 27 of the connecting member 23, the fluid characteristics of the connecting member 23 are deteriorated due to an increase in the radial thickness. An increase in mass can also be suppressed.

  In the present embodiment, in the widened portion 28 of the surface 27, a part of the radially inner side of the surface 27 bulges in a substantially semi-circular shape radially inward, so that the radial width of the surface 27 is increased. Has been partially enlarged. In the portion other than the widened portion 28 on the surface 27, the width in the radial direction is kept substantially constant. As a modification, instead of the radially inner side of the surface 27, a part of the radially outer side may bulge radially outward to form the widened portion 28, or the surface The widened portion 28 may be formed by bulging a part of both sides in the radial direction of the 27 in the radial direction so as to be separated from each other. Further, the bulging shape of the inner and outer sides in the radial direction of the surface 27 for forming the widened portion 28 is not limited to a substantially semicircular shape, and various bulging shapes such as a substantially rectangular shape or a substantially triangular shape. Can be adopted.

  Further, since the portion of the moving blade 22 has a large contact area with the molds 31, 32, the connecting member 23 is pressed when the impeller 1 is separated from the mold 32 by pressing the connecting member 23 with the movable portion 33 of the mold 32. A load is easily applied to the connecting portion between the rotor 23 and the rotor blade 22.

  Therefore, in the present embodiment, the same number of widened portions 28 as the moving blades 22 are provided, and when viewed from the direction of the central axis 17, the overlapping sections S overlap the moving blades 22 on the surface 27 of the connecting member 23 where the widened portions 28 are provided. Are arranged at any of the positions. As a modification, the number of widened portions 28 may be larger or smaller than the number of moving blades 22, for example, one. Further, the widened portion 28 may be disposed at a position other than the overlapping section S on the surface 27.

  As described above, since the widened portion 28 is disposed at any position in the overlapping section S on the surface 27 of the connecting member 23, a portion of the connecting member 23 coupled to the moving blade 22 by the movable portion 33 of the mold 32 is used. The impeller 1 can be separated from the mold by pressing. As a result, when the impeller 1 is pushed away from the mold 32 by the movable portion 33 and separated, the impeller 1 can be easily separated without causing deformation of the moving blade 22 and the connecting member 23.

  In addition, since the widened portion 28 is disposed in each of a plurality of overlapping sections S obtained corresponding to all the rotor blades 22, when the impeller 1 is pushed away from the mold 32 by the movable portion 33 and separated. The impeller 1 can be easily separated while more reliably preventing the deformation of the moving blades 22 and the connecting portions of the moving blades 22 and the connecting members 23 for all of the moving blades 22.

  Next, the arrangement position of the widened portion 28 in the overlapping section S will be described. As described above, the rotor blade 22 of the impeller 1 is inclined with respect to a plane perpendicular to the direction of the central axis 17 when the rotor blade 22 is cut along a plane perpendicular to the extending direction of the rotor blade 22. For this reason, the distance L (refer FIG. 5) along the center axis | shaft 17 direction from the surface 27 to the moving blade 22 with the circumferential position in the overlap area S of the surface 27 in which the wide part 28 of the connection member 23 is provided. Change. Accordingly, the degree of close contact between the radial inner side surface 29 or the outer side surface 30 of the connecting member 23 corresponding to the overlapping section S and the mold 32 provided with the movable portion 33 is also determined in the circumferential direction within the overlapping section S. The degree of adhesion increases as the distance L from the surface 27 to the moving blade increases.

  Therefore, in the present embodiment, the widened portion 28 is located in the direction of the central axis 17 between the ends E1 and E2 and the rotor blade 22 among the first and second ends E1 and E2 on both sides of the overlapping section S in the circumferential direction. It is arranged at any position P between the first end E1 having the longer distance L along the intermediate position M in the circumferential direction of the overlapping section S (within the partial section Sa). In the present embodiment, in the overlapping section S, the first end E1 is an end on the front side in the rotational direction 20, and the second end E2 is an end on the rear side in the rotational direction 20. Therefore, in the overlapping section S of the connecting member 23, the degree of close contact between the portion of the radially inner side surface 29 or the outer side surface 30 of the connecting member 23 corresponding to the overlapping section S and the mold 32 provided with the movable portion 33. The receiving part of the movable part 33 can be provided in a large part. As a result, when the impeller 1 is pushed away from the mold 32 by the movable portion 33 and separated, the impeller 1 can be easily separated while preventing the moving blade 22 and the connecting member 23 from being deformed more reliably.

  More preferably, in the present embodiment, the widened portion 28 is first than the intermediate position M in the circumferential direction between the first end E1 of the overlapping section S and the intermediate position M (in the partial section Sa). It is arrange | positioned in the position P close | similar to the edge E1. Therefore, in the overlapping section S of the connecting member 23, the degree of close contact between the portion of the radially inner side surface 29 or the outer side surface 30 of the connecting member 23 corresponding to the overlapping section S and the mold 32 provided with the movable portion 33. The receiving part of the movable part 33 can be provided in a larger part. As a result, when the impeller 1 is pushed away from the mold 32 by the movable portion 33 and separated, the impeller 1 can be easily separated while further reliably preventing the deformation of the rotor blade 22 and the connecting member 23.

  More preferably, in the present embodiment, the widened portion 28 is the first of the first and second ends E1, E2 of the overlapping section S that has the larger distance L between the ends E1, E2 and the rotor blade 22. 1 near the end E1. That is, in the present embodiment, the widened portion 28 is disposed in the vicinity of the portion where the front edge 22a in the rotational direction 20 of the moving blade 22 is coupled to the connecting member 23 in the overlapping section S when viewed from the direction of the central axis 17. Has been. Therefore, in the overlapping section S of the connecting member 23, the degree of close contact between the portion of the radially inner side surface 29 or the outer side surface 30 of the connecting member 23 corresponding to the overlapping section S and the mold 32 provided with the movable portion 33. The receiving part of the movable part 33 can be provided in the vicinity of the largest part. As a result, when the impeller 1 is pushed away from the mold 32 by the movable portion 33 and separated, the impeller 1 can be easily separated while further reliably preventing the deformation of the rotor blade 22 and the connecting member 23.

  Further, in the present embodiment, in order to facilitate the molding by the molds 31 and 32 (the mold 32 in this embodiment) where the widened portion 28 of the connecting member 23 is provided, The projecting shape toward the side is continuously connected in a constant shape from the surface 27 to the surface of the rotor blade 22 along the direction of the central axis 17. In other words, in the present embodiment, on the inner side surface 29 of the connecting member 23, the protruding portion 35 that continuously extends in the direction of the central axis 17 from the surface 17 to the surface of the rotor blade 27 at a position corresponding to the widened portion 28. Is provided.

  Further, as described above, the rotor blade 22 of the impeller 1 has a cross-sectional shape such that the front side edge portion 22a in the rotational direction 20 is located closer to the intake side in the central axis 17 direction than the rear side edge portion 22b in the rotational direction 20. It is inclined with respect to a plane perpendicular to the central axis 17. For this reason, the parting lines 36 and 37 formed on the inner side surface 29 and the outer side surface 30 located between the rotor blades 22 in the connecting member 23 of the impeller 1 have substantially the central axis 17 direction or the central axis 17 direction. In other words, portions 36a and 37a extending along the direction inclined with respect to the angle are included. In the present embodiment, the portions 36a and 37a extend substantially along the direction of the central axis 17. In addition, a parting line means the shape change part formed along the junction part of metal mold | dies on the surface of a resin molded product.

  As a feature of the configuration according to the present embodiment, a part 36a of the parting line 36 formed on the inner side surface 29 of the connecting member 23 and a part 37a of the parting line 37 formed on the outer side surface 30 are arranged in the circumferential direction. In contrast, they are arranged at positions shifted from each other.

  As described above, in the impeller 1 according to the present embodiment, deformation of the connecting member 23 of the impeller 1 due to extrusion by the movable portion 33 of the molds 31 and 32 after injection molding is avoided, and the radial direction The deterioration of the fluid characteristics and the increase in mass of the connecting member 23 due to the increase in the thickness of the connecting member 23 are also suppressed. Therefore, it is possible to provide the fan device 11 that can generate an air flow stably and efficiently.

  Further, in the impeller 1 according to the present embodiment, as illustrated in FIG. 1, the gate trace 210 of the gate at the time of injection molding is disposed near the root of each rotor blade 22 on the intake side surface in the direction of the central axis 17 of the support portion 21. ing. Therefore, since the connecting member 23 is filled with the resin material via the moving blades 22 at the time of injection molding, the vicinity of the substantially central portion between the moving blades 22 in the connecting member 23 is the final filling position of the resin material. There is a risk of gas burning in the vicinity. Since gas burning causes deterioration of the appearance of the molded product (for example, discoloration due to short molding or burning) and strength reduction (for example, decrease in resin filling density, weld line, etc.), countermeasures are necessary.

  Therefore, as a countermeasure, degassing pins are arranged at a plurality of locations on the surface 26 or 27 (27 in the present embodiment) of the connecting member 23 of the impeller 1, and the gas generated during molding is made gold using the degassing pins. You may make it discharge | emit out of a type | mold. For example, in the example shown in FIG. 4, with respect to each overlapping section S overlapping with each rotor blade 22 on the surface 27 of the connecting member 23, both sides in the circumferential direction of the central position M in the circumferential direction of the overlapping section S (for example, overlapping sections) Gas venting pins are provided at substantially both ends E1, E2) of S, respectively. In FIG. 4, pin marks 230a and 230b of the degassing pins are shown. Correspondingly, an installation space for the gas vent pin is secured in a portion corresponding to the position of the gas vent pin in the molds 31 and 32.

It is the perspective view seen from the central-axis direction intake side of the impeller which concerns on one Embodiment of this invention. It is a side view of the impeller of FIG. It is the bottom view seen from the central axial direction exhaust side of the impeller of FIG. It is a figure which expands and shows a part of FIG. It is the figure which looked at the coupling | bond part of the moving blade and connecting member in the impeller of FIG. 1 from the radial inside. It is sectional drawing of the fan apparatus with which the impeller of FIG. 1 was used. FIG. 7A to FIG. 7C are diagrams showing manufacturing steps of the impeller of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Impeller, 11 Fan apparatus, 12 Stator blade, 13 Motor, 14 Outer frame body, 15 Support body, 16 Housing, 17 Center axis, 18 Rotor magnet, 19 Armature, 20 Rotating direction, 21 Support part, 21a Cylindrical outside Side, 22 blades, 23 connecting members, 26, 27 faces, 28 widened part, 31, 32 mold, 33 movable part, 34 closed space, 36, 37 parting line, E1, E2 end, L distance, M center Position, S Overlapping section.

Claims (5)

An impeller,
A support portion having a cylindrical outer surface around the central axis;
A plurality of blades that are formed to extend radially outward from the cylindrical outer surface of the support portion and generate an air flow in the central axis direction by rotating around the central axis together with the support portion. When,
A substantially annular connecting member that is formed along a circumferential direction about the central axis and has two surfaces facing both sides of the central axis direction, and that connects the plurality of blades;
With
The support portion, the plurality of wings, and the connecting member are integrally formed of a continuous resin member,
At least one of the two surfaces of the connecting member is provided with at least one widened portion obtained by partially expanding the radial width of the surface ,
The widened portion is in an overlapping section overlapping the wings on the surface of the connecting member provided with the widened portion when viewed from the central axis direction, and the first and the first on both sides in the circumferential direction of the overlapping section Among the second ends, any position between the first end having a larger distance along the central axis direction between the end and the wing and the intermediate position of the overlapping section with respect to the circumferential direction Impeller characterized by being arranged in . The impeller according to claim 1,
The widened portion is disposed between the first end of the overlapping section and the intermediate position at a position closer to the first end than the intermediate position with respect to the circumferential direction. Impeller. The impeller according to claim 1 or 2 ,
The widened portion is disposed in each of the plurality of overlapping sections obtained corresponding to each of the plurality of blades. The impeller according to any one of claims 1 to 3 ,
The widened portion is
An impeller provided to a mold for molding the resin member so as to be capable of moving forward and backward, and forming a receiving part of a movable part that pushes the resin member out of the mold . A fan device,
  The impeller according to any one of claims 1 to 4,
  A motor for driving the impeller;
  An outer frame surrounding the impeller;
  A support that is provided radially inward of the outer frame and supports the motor;
A fan device comprising:

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