JP2018150865A - Turbofan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbofan where deposition is uniformized with ultrasonic deposition compared to conventional turbofans, thereby improving deposition quality.SOLUTION: A turbofan 10 includes a main plate 12 having, at its center part, a boss fixed on a rotational shaft of a motor, and a bladed shroud 13 with a plurality of blade parts 134, wherein the main plate and the shroud are molded separately by thermoplastic resin, and the bladed shroud is integrated with the main plate by ultrasonic deposition. Each blade part of the bladed shroud includes at least one projection. The main plate includes a fitting part A fitted to the blade part of the bladed shroud. In the fitting part A, provided is a hole part into which the projection is fitted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a turbofan molded from a thermoplastic resin mounted on an air conditioner, and relates to a turbofan that is intended to confirm and improve the welding quality.

  A conventional turbofan is composed of a fan body in which a main plate and a plurality of wings having a bag-like hollow structure having openings on the back side are integrally formed of a thermoplastic resin, and a shroud. Further, each blade of the fan body has a fitting female portion communicating from the blade tip to the blade hollow portion, and a fitting male portion extending from the shroud in the fan height direction at each blade of the shroud. Is formed.

  Then, after the fitting male part of the shroud is inserted into the fitting female part of the fan main body, the blade tip welded part which becomes the inclined surface of the shroud surface and the fan main body and the side of the male male part of the shroud and the fan main body are fitted A side surface of the female portion is fixed and integrated to form a turbo fan. When both the shroud and the fan main body formed in this way are fixed, positioning can be performed easily and accurately by the fitting male portion of the shroud and the fitting female portion of the fan main body (see, for example, Patent Document 1). ).

  The conventional turbofan is configured as described above, and the positioning accuracy when the shroud and the fan main body are fixed can be improved. However, the welding surface between the shroud and the fan main body is the surface of the shroud, the blade tip welded portion that becomes the inclined surface of the fan main body, the side surface of the fitting male portion of the shroud, and the side surface of the female fitting portion of the fan main body. When the fan body is assembled and welded, both are pressurized in the direction of the rotation axis (vertical direction) of the turbofan, but the blade tip welded part of the fan body is inclined in the blade rotation direction, so the blade tip welded part is As a result, the vertical force escapes and a horizontal force is applied to the wing, resulting in a decrease in the welding force, and there is a possibility that the welding is not evenly performed.

Japanese Patent No. 3509456

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a turbofan that is welded more uniformly by ultrasonic welding than conventional turbofans and has improved welding quality.

The turbofan of the first invention for solving the above problems has the following characteristics.
A main plate having a boss fixed to the rotation shaft of the motor in the center and a shroud with blades provided with a plurality of blade portions are separately molded with a thermoplastic resin,
A turbofan in which the bladed shroud is integrated with the main plate by ultrasonic welding,
Each blade portion of the bladed shroud includes at least one protrusion,
The main plate includes a fitting portion A with the blade portion of the shroud with blades, and the fitting portion A has a hole portion into which the protrusion is fitted.

According to the turbofan of the first invention, the following effects are exhibited.
One or more protrusions are provided on the blade portion of the bladed shroud. On the main plate side, a fitting portion for fitting the blade portion and a hole portion into which the protrusion of the blade portion is fitted are provided. Because of this structure, positioning and fixing are sufficiently performed when the blade part of the shroud with blades is assembled to the main plate and ultrasonic welding is performed, and the pressure of ultrasonic welding is applied to the shroud with blades, etc. However, the applied pressure is transmitted evenly and the joint is welded evenly.

The turbofan of the second invention has the following features in the first invention.
The shape of the projection on the at least one blade portion and the hole on the main plate side corresponding to the blade portion in the turbofan is the shape of the protrusion on the other blade portion and the hole portion on the main plate side corresponding to the blade portion. Is different.

  According to the turbofan of the second invention, when the blade portions of the shroud with blades are arranged at an uneven pitch with respect to the circumferential direction of the turbofan, incorrect assembly to different fitting portions on the main plate side Prevention becomes possible. As a result, the performance of the turbofan can be properly exhibited.

The turbofan of the third invention has the following features in the first invention or the second invention.
The fitting part A was provided in a standing wall shape surrounding the periphery of the blade part fitted into the fitting part A.

According to the turbofan of the third invention, the following effects are exhibited.
The blade portion of the shroud with blades is fitted into a fitting portion A provided in a wall shape standing so as to surround the periphery thereof. In addition, since the blade portion is fitted with the protrusion provided on the blade portion and the hole portion provided in the fitting portion A, each blade portion and the main plate are equal when the turbofan is manufactured by ultrasonic welding. To be welded.

The turbofan of the fourth invention has the following features in any of the first invention to the third invention.
The welding edge was provided in the fitting part A with the shroud with blades of the main plate.

  According to the fourth invention, since the welding edge is provided in the fitting portion A, the joining of the blade portion of the shroud with blades and the main plate becomes easier and stronger.

The turbofan of the fifth invention has the following features in any one of the first invention to the fourth invention.
The welding edge provided in the fitting part A with the shroud with blades of the main plate was provided in the center of the fitting part A.

  According to the fifth invention, since the welding edge is provided at the center of the fitting portion A, the blade portion of the shroud with blades can maintain a stable posture in the fitting portion A of the main plate. For this reason, the blade | wing part and main plate of a shroud with a blade | wing can be welded equally.

The turbofan of the sixth invention has the following features in any one of the first invention to the fifth invention.
The hole is penetrating.

According to the sixth invention, the effects of the first to fifth inventions are exhibited, and the following effects are also exhibited.
Since the hole provided in the fitting part A is penetrating, after the blade part of the shroud with blades is fitted and welded to the fitting part A of the main plate, the opening part of the hole part of the fitting part A From the above, the state of the protrusion of the blade portion can be confirmed. If the dimensions from the bottom of the main plate to the projections of the blades are confirmed, it is possible to confirm whether or not the degree of welding between the blades and the main plate is uniform, and the welding quality of the turbofan is greatly improved. Conventionally, as shown in FIG. 2, the welded state is confirmed by the height h of the bottom of the main plate of the finished turbofan and the peripheral flange of the shroud. Compared with such a conventional confirmation method, the confirmation accuracy of the welded state has been remarkably improved.

The turbofan of the seventh invention for solving the above-described problems has the following characteristics.
A main plate with blades having a boss fixed to the rotation shaft of the motor at the center and having a plurality of blade portions, and a shroud are separately molded with a thermoplastic resin,
A turbofan in which the bladed main plate is integrated with the shroud by ultrasonic welding,
Each blade portion of the bladed main plate includes at least one protrusion,
The shroud includes a fitting portion B with the blade portion of the main plate with blades, and the fitting portion B has a hole portion into which the protrusion is fitted.

  According to the seventh aspect, the same effect as in the first to sixth aspects is exhibited.

The turbofan of the eighth invention for solving the above-described problems has the following characteristics.
A main plate having a boss fixed to the rotation shaft of the motor at the center, a shroud, and a plurality of blade members are separately molded with a thermoplastic resin,
A turbofan in which the plurality of blade members are integrated with the main plate and the shroud by ultrasonic welding,
The blade member includes at least two protrusions,
The main plate includes a fitting portion C with the plurality of blade members,
The shroud includes a fitting portion D with the plurality of blade members,
The fitting part C and the fitting part D were provided with holes for fitting the protrusions of the blade member.

  According to the eighth invention, the same effect as in the first to sixth inventions is exhibited. Further, the turbofan is divided into three members, a shroud, a blade member, and a main plate, and is manufactured by ultrasonic welding. Therefore, the structure of the mold to be molded is simplified, and the effect that the turbofan is inexpensive is also exhibited.

The perspective view which shows the set state at the time of the assembly of the main plate of the turbo fan of Embodiment 1 of this invention, and a shroud with a blade | wing. FIG. 3 is a perspective view illustrating a completed state of the turbo fan according to the first embodiment. 1 is an overall schematic view of a bladed shroud of a turbofan according to Embodiment 1. FIG. Explanatory drawing of the blade | wing part of the shroud with a blade | wing of the turbo fan of Embodiment 1. FIG. 1 is an overall schematic view (perspective view) of a main plate of a turbofan according to Embodiment 1. FIG. 1 is an overall schematic view (plan view) of a main plate of a turbofan according to Embodiment 1. FIG. Explanatory drawing of the fitting part A provided in the main plate of the turbo fan of Embodiment 1. FIG. The elements on larger scale of the fitting part A of FIG. Explanatory drawing of the process of ultrasonically welding the turbo fan of Embodiment 1. FIG. The perspective view which shows the set state at the time of the assembly of the blade | wing main board and shroud of the turbofan of Embodiment 2 of this invention. FIG. 4 is an overall schematic diagram of a shroud of a turbofan according to a second embodiment. The enlarged view of the fitting part B provided in the shroud of the turbo fan of Embodiment 2. FIG. Explanatory drawing of the process of ultrasonically welding the turbo fan of Embodiment 2. FIG. The perspective view which shows the set state at the time of the assembly of the main board, shroud, and blade | wing member of the turbofan of Embodiment 3 of this invention. Explanatory drawing of the blade member of the turbo fan of Embodiment 3. FIG.

  The turbofan of the present invention will be described with reference to FIGS.

  1 is a perspective view showing a set state of the turbo fan main plate and bladed shroud according to the first embodiment of the present invention during assembly, FIG. 2 is a perspective view showing a completed state of the turbo fan of the first embodiment, and FIG. 4 is an overall schematic view of a shroud with blades of a turbo fan of Embodiment 1, FIG. 4 is an explanatory view of blade portions of the shroud with blades of the turbo fan of Embodiment 1, and FIG. 5 is an overall schematic view of a main plate of the turbo fan of Embodiment 1. (Perspective view), FIG. 6 is an overall schematic diagram (plan view) of the main plate of the turbo fan of the first embodiment, FIG. 7 is an explanatory view of the fitting portion A provided on the main plate of the turbo fan of the first embodiment, and FIG. It is the elements on larger scale of the fitting part A of FIG. FIG. 9 is an explanatory diagram of a process for ultrasonic welding of the turbofan of Embodiment 1, FIG. 9A shows a state before welding, and FIG. 9B shows a state after welding.

  FIG. 10 is a perspective view showing a set state when the turbofan bladed main plate and shroud of the second embodiment of the present invention are assembled, FIG. 11 is an overall schematic diagram of the turbofan shroud of the second embodiment, and FIG. It is an enlarged view of the fitting part B provided in the shroud of the turbo fan of Embodiment 2. FIG. 13 is an explanatory diagram of a process for ultrasonic welding of the turbo fan according to the second embodiment. FIG. 13A shows a state before welding, and FIG. 13B shows a state after welding.

  FIG. 14 is a perspective view showing a set state when assembling the main plate, shroud, and blade member of the turbo fan according to the third embodiment of the present invention, and FIG. 15 is an explanatory view of the blade member of the turbo fan according to the third embodiment.

  Conventionally, a turbofan is manufactured by individually molding each member and assembling and joining (welding) by ultrasonic welding. As shown in FIG. 2, the finished product after welding confirms whether or not the h dimension after welding is a specified dimension. However, it is difficult to confirm whether or not each member is uniformly welded. In order to solve such a problem, the inventor made various improvements to the structure and structure of the components that are uniformly welded, and further studied a method for confirming whether or not the members were uniformly welded, and reached the present invention. According to the present invention, the components shown in FIG. 1, FIG. 10 and FIG. 14 are arranged as shown in FIG. 1, FIG. 10 and FIG. 14 and assembled and joined by ultrasonic welding. It is possible to get a fan. It is also possible to confirm whether or not each member is uniformly welded.

<1> Turbo Fan of Embodiment 1 The configuration and structure of each member of the turbo fan of Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 2 shows a completed state of the turbo fan 10 according to the first embodiment.

  FIG. 1 shows a state where a disk-shaped main plate 12 and a bladed shroud 13 constituting the turbofan 10 are set. The bladed shroud 13 has a plurality of blade portions 134 that are connected to the main plate 12 in a shroud 131 that forms a fan air guide passage. Each part is individually injection molded using a thermoplastic resin. The blade part 134 of the bladed shroud 13 is fitted and assembled into fitting parts A provided at a plurality of locations around the main plate 12. Each part is joined by ultrasonic welding. The structure of the blade part 134 will be described in detail in <1-3>. As shown in FIG. 1, the blade part 134 has a positive pressure surface that pushes out the wind and a negative pressure surface that is the opposite surface. In this embodiment, the case where the blade | wing part 134 is the same shape (straight) from the top part to the bottom part is demonstrated. In addition, in order to implement | achieve the ventilation characteristic of a turbo fan, the shape of the blade | wing part 134 may be a shape which showed the required curved surface shape in the positive pressure surface and the negative pressure surface.

<1-1> Structure of Main Plate As shown in FIGS. 5 and 6, the main plate 12 includes a convex hub 122 formed so as to cover the motor at the center thereof, and a motor shaft at the center of the hub 122. Has a boss 121 to be inserted and fixed in the height direction (vertical direction in FIGS. 1 and 2). Further, as shown in FIG. 5, a fitting portion A (hereinafter referred to as a fitting portion 124) into which the blade portion 134 is fitted when assembled and joined to the blade-shaped shroud 13 is provided at the peripheral portion of the main plate 12. The number of blade portions 134 is provided.

  The fitting part 124 is configured as shown in FIGS. The wall portion 125, the hole portion 126, and the welding edge 127 are formed so as to stand on the main plate 12 and have a predetermined height and thickness. The hole 126 may be a through shape or a bag shape. The bottom part 134B of the blade part 134 of the bladed shroud shown in FIGS. 3 and 4 is fitted into the fitting part 124. A columnar protrusion 135 shown in FIG. The protrusion 135 is fitted into a hole 126 provided in the fitting portion 124 of the main plate 12. In FIG. 7, three holes 126 are provided in each fitting portion 124. The number is not limited to three, and it is sufficient that at least one is provided. The bottom part 134B and the side part 134S of the blade part 134 of FIG. 4 are fitted and positioned by the wall part 125 and the hole part 126 of the fitting part 124. Further, when the bottom part 134B and the side part 134S of the blade part 134 are fitted into the fitting part 124, the bottom surface (bottom part 134B) of the blade part 134 comes into contact with the welding edge 127 as shown in FIG. As shown in FIG. 7, the welding edge 127 is provided at the center portion of the fitting portion 124, with two rows between the hole portions 126 and two rows at other portions, for a total of four rows. The cross section has a substantially triangular shape as shown in FIG. When the number of the holes 126 provided in the fitting portion 124 is one, two rows of welding edges are provided.

  FIG. 9A shows a state immediately before the main plate 12 and the blade part 134 are joined by ultrasonic welding. By configuring the fitting portion 124 as shown in FIGS. 7 and 8, each blade portion 134 is welded and joined to the main plate 12 in a stable posture even when subjected to the applied pressure during ultrasonic welding, as shown in FIG. 9B. It becomes a state.

<1-2> Structure of Shroud with Blades The shroud with blades 13 will be described with reference to FIGS. FIG. 3 is a view of the bladed shroud 13 of FIGS. 1 and 2 as viewed from below so that the blade part 134 and the protrusion 135 of the blade part can be seen. As shown in FIG. 3, the bladed shroud 13 has a large opening 132 at the center. The peripheral portion 133 has a substantially inclined surface in the outer peripheral direction. Further, the peripheral portion 133 is provided with the same number as the fitting portions 124 (see FIGS. 5 and 6) for fitting the blade portions 134 to the main plate 12.

<1-3> Structure of Blade Part Each blade part 134 of the shroud with blades 13 is provided with a protrusion 135 that is fitted into a hole 126 provided in the fitting part 124 of the main plate 12. The protrusion 135 has a cylindrical shape. 3 and 4, the shape of the blade portion 134 is the same shape (straight) from the top to the bottom of the positive pressure surface that pushes out the wind and the opposite surface. Since there are a plurality of blade portions 134, in order to reduce the weight of the turbofan, it can be hollowed out by a method such as blow molding.

<1-4> Assembly and Joining of Turbo Fan As shown in FIG. 1, the main plate 12 and the shroud 13 with blades configured as described above are provided with the blade portion 134 of the shroud 13 with blades on the fitting portion 124 of the main plate 12. Insert temporary assembly. The temporary assembly is referred to as a workpiece below. At this time, the projections 135 of the blades 134 are fitted into the holes 126 of the fitting portions 124 of the main plate 12. At this time, as shown in FIG. 9A, the bottom portion 134B of the blade portion 134 and the welding edge 127 in the fitting portion 124 of the main plate 12 are in contact with each other. The blade portion 134 of the bladed shroud 13 is guided by the wall portion 125 of the fitting portion 124 of the main plate 12, and the projection 135 of the blade portion 134 is fitted into the hole 126 in the fitting portion 124, so that ultrasonic welding is performed. The previous workpiece can secure a stable posture. In FIG. 9A, the projection 135 of the blade portion 134 fitted in the hole 126 is indicated by a two-dot chain line in relation to the welding edge.

  The work temporarily assembled in this way is placed on a jig of an ultrasonic welding machine. A predetermined position of the blade shroud 13 of the workpiece is contact-pressed with a horn of an ultrasonic welder, the welding edge 127 is melted, and the workpiece is integrated. As shown in FIG. 1, the work plate may be placed on the jig of the ultrasonic welder by setting the main plate 12 on the jig or by inverting and setting the bladed shroud on the jig. May be.

  In this ultrasonic welding process, the configuration of the fitting portion 124 of the main plate 12 and the configuration of the shroud 13 with blades interact with each other, and the blades 134 and the main plate of the shroud 13 with blades are not displaced. 9 is uniformly ultrasonically welded in a stable posture, and the state shown in FIG. 9B is obtained. Therefore, the turbo fan 10 with stable quality can be obtained by ultrasonic welding.

  Further, the hole 126 is a through hole having a recessed portion K as shown in FIG. 9, so that the state of the projection 135 of the bladed shroud 134 can be confirmed. As shown in FIG. 9B, by checking the dimension H between the tip of the projection 135 and the bottom of the main plate 12, it can be confirmed how much ultrasonic welding has been performed. When the number of the hole 126 of each fitting part 124 and the number of protrusions 135 of each blade part 134 is one, it is possible to confirm the variation in the degree of welding between each blade part and the main plate. Further, when a plurality of hole portions 126 of each fitting portion and a plurality of projections 135 of each blade portion are provided, it is possible to check how uniformly each blade portion is welded to the fitting portion of the main plate.

  Based on the above confirmation results, it is possible to appropriately review the molding conditions, ultrasonic welding conditions, and welding jig of each member of the turbofan 10. Therefore, compared with the conventional welding confirmation method (confirmation method based on the dimension h in FIG. 2), the accuracy of confirmation of the uniformity of welding is significantly improved, and a high-quality turbofan can be provided. The present invention makes it possible to review the manufacturing conditions of the previous process, and also exhibits the effect of performing ultrasonic welding stably and uniformly.

<2> Turbo Fan of Embodiment 2 The configuration and structure of each member of the turbo fan 20 of Embodiment 2 of the present invention will be described below with reference to FIGS. FIG. 2 shows a completed state of the turbo fan 20 according to the second embodiment. The appearance is almost the same as the turbo fan 10 of the first embodiment.

  FIG. 10 shows a state where the disk-shaped main plate 22 with blades and the shroud 23 constituting the turbo fan 20 are set. The shroud 23 forms a fan air intake duct. The bladed main plate 22 has a plurality of blade portions 224 connected to the shroud 23. Each part is individually injection molded using a thermoplastic resin. The blade portions 224 of the bladed main plate 22 are fitted and assembled and joined to fitting portions B (hereinafter referred to as fitting portions 234, see FIG. 11) provided at a plurality of locations on the peripheral portion 233 of the shroud 23. Bonding is performed by ultrasonic welding. The structure of the blade portion 224 is the same as that described in <1-3>.

  As shown in FIG. 10, the bladed main plate 22 has no fitting portion 124 of the main plate 12 of the first embodiment, and the blade portion 224 is provided at substantially the same position as the fitting portion 124. The bladed main plate 22 has a convex hub 222 formed so as to cover the motor at the center thereof, and a motor shaft inserted into the center of the hub 222 in the height direction (vertical direction in FIG. 10). And a boss 221 to be fixed. Three protrusions 225 are provided on the top 224T of the blade 224. The number of protrusions is not limited to three, but may be one or more. The protrusion 225 is fitted into a hole 236 (see FIG. 11) of a fitting portion 234 of the shroud 23 described later. The hole 236 may be a through shape or a bag shape.

  The shroud 23 will be described with reference to FIG. FIG. 11 is a view of the shroud 23 viewed from the back so that the fitting portion 234 can be seen. As shown in FIG. 11, the shroud 23 has a large opening 232 in the center. Further, the peripheral portion 233 is provided with the same number of fitting portions 234 as the blade portions 224 at the positions where the blade portions 224 of the main plate 22 with blades are fitted with the top portions 224T of the blade portions 224. The peripheral portion 233 has a substantially inclined surface in the outer peripheral direction. As shown in FIG. 12, the fitting portion 234 has a shape that can be fitted in accordance with the shape of the top portion 224T of the blade portion 224 (see FIG. 10). The fitting part 234 is configured such that the top part 224T and the side part 224S of the blade part 224 are fitted and positioned along the wall part 235.

  As shown in FIG. 12, a hole 236 and a welding edge 237 are provided in the ceiling portion 238 of the fitting portion 234. A total of four rows of welding edges 237 are provided on the ceiling portion 238 at portions other than the hole portions 236. The welding edge 237 is provided at the center of the fitting portion 234. The cross section of the welding edge 237 has a substantially triangular shape as shown in FIG. When the top portion 224T of the blade portion 224 is fitted into the fitting portion 234, the projection 225 of the blade portion 224 is fitted into the hole portion 236, and the top portion 224T comes into contact with the welding edge 237 to be in the state of FIG. In FIG. 13A, the protrusion 225 of the blade 224 fitted in the hole 236 is indicated by a two-dot chain line in relation to the welding edge.

  As shown in FIG. 10, each blade portion 224 is provided with a protrusion 235 that fits into a hole portion 236 provided in the fitting portion 234 of the shroud 23. The protrusion 235 has a cylindrical shape. In addition, the shape of the blade portion 224 is the same shape (straight) from the top to the bottom of the positive pressure surface that pushes out the wind and the opposite surface. In addition, the shape of the blade portion 224 may be a shape in which the positive pressure surface and the negative pressure surface have a required curved surface shape in order to realize the air blowing characteristics of the turbo fan. Furthermore, since there are a plurality of blade portions 224, it can be hollowed out by a method such as blow molding in order to reduce the weight of the turbofan.

  The bladed main plate 22 and the shroud 23 configured as described above are temporarily assembled by fitting the blade portion 224 of the bladed main plate 22 into the fitting portion 234 of the shroud 23 as shown in FIG. The temporary assembly is referred to as a workpiece below. At this time, the protrusions 225 of the blade portions 224 are fitted in the holes 236 of the fitting portions 234 of the shroud 23. At this time, as shown to Fig.13 (a), the top part 224T of the blade | wing part 224 and the welding edge 237 in the fitting part 234 of the shroud 23 are the states which are contacting. The blade portion 224 of the bladed main plate 22 is guided by the wall portion 235 of the shroud fitting portion 234, and the hole 236 in the fitting portion 234 and the protrusion 225 of the blade portion 224 are fitted, so that the ultrasonic welding is performed. This work can secure a stable posture.

  The work temporarily assembled in this way is placed on a jig of an ultrasonic welding machine. The horn of the ultrasonic welding machine contacts and pressurizes a predetermined position of the shroud 23 of the workpiece, the welding edge 237 is melted, and the workpiece is integrated. As shown in FIG. 10, the method of placing the work on the jig of the ultrasonic welding machine may be such that the main plate 22 with blades may be set on the jig, or reversed and the shroud 23 is set on the jig. You may do it.

  In the process of this ultrasonic welding, the configuration of the main plate 22 with blades and the configuration of the fitting portion 234 of the shroud 23 interact with each other, and the blade portions 224 of the main plate 22 with blades and the shroud are not displaced. 23 can be uniformly ultrasonically welded in a stable posture. Accordingly, a stable quality turbo fan 20 can be obtained by ultrasonic welding.

  Further, by making the hole 236 a through hole, the same effect as the turbofan 10 of the first embodiment is exhibited.

<3> Turbo Fan of Embodiment 3 The configuration and structure of each member of the turbo fan 30 of Embodiment 3 of the present invention will be described below with reference to FIGS. FIG. 2 shows a completed state of the turbo fan 30 according to the third embodiment. The appearance is almost the same as the turbo fan of the first embodiment.

Hereinafter, the configuration and structure of each member of the turbo fan according to Embodiment 3 will be described.
FIG. 14 shows a state where the disk-shaped main plate 32, the shroud 33, and the blade member 34 constituting the turbo fan 30 are set. Each part is individually injection molded using a thermoplastic resin. The shroud 33 forms a fan air intake duct. The blade member 34 is fitted and assembled into a fitting portion C (same shape as FIG. 7) of the main plate 32 and a fitting portion D (same shape as FIG. 12) of the shroud 33. Bonding is performed by ultrasonic welding. The main plate 32, the shroud 33, and the blade member 34 will be described with reference to FIGS. 9, 13, 14, and 15. FIG. In the third embodiment, the main plate 32 is the same as that in FIGS. 5 to 9 in the first embodiment, and the shroud is the same as that in FIGS. 11 to 13 in the second embodiment. Therefore, in FIGS. 5 to 9 and FIGS. 11 to 13, the parts corresponding to the main plate and the shroud of the third embodiment are numbered in parentheses.

  As shown in FIG. 14, the main plate 32 has a convex hub 322 formed so as to cover the motor at the center thereof, and the motor shaft at the center of the hub 322 in the height direction (vertical direction in FIG. 14). And a boss 321 to be inserted and fixed. In order to assemble and join the blade member 34 to the main plate 32 and the shroud 33, the main plate 32 is fitted with a fitting portion C (hereinafter referred to as a fitting portion 324, see FIGS. 5 to 9). Are provided with the same number of fitting portions D (hereinafter referred to as fitting portions 334, see FIGS. 11, 12, and 13) into which the blade members 34 are fitted. In addition, three protrusions 345 are provided on the top 34T and the bottom 34B of the blade member 34, respectively. The number of the protrusions 345 is not limited to three, but may be one or more on the top 34T and the bottom 34B. The protrusion 345 is fitted into a hole 326 of the fitting portion 324 of the main plate 32 and a hole 336 of the fitting portion 334 of the shroud 33 which will be described later.

  The shroud 33 will be described with reference to FIG. The shroud 33 has a large opening 332 at the center. The peripheral portion 333 is provided with the same number of fitting portions 334 (see FIGS. 11 and 12) as the blade members 34 at the positions where the blade members 34 are fitted. The peripheral portion 333 has a substantially inclined surface in the outer peripheral direction. The fitting portion 334 (see FIGS. 11 and 12) has a shape that matches the shape of the top portion 34T of the blade member 34 shown in FIG. 15, and the top portion 34T and the side portion 34S of the blade member 34 along the wall portion 335 thereof. Is configured to be fitted and positioned.

  As shown in FIG. 12, a hole 336 and a welding edge 337 are provided in the ceiling portion 338 of the fitting portion 334. The welding edge 337 is provided at the center of the ceiling portion 338 of the fitting portion 334. The cross section of the welding edge 237 has a substantially triangular shape. When the top portion 34T of the blade portion 34 is fitted into the fitting portion 334, the top portion 34T comes into contact with the welding edge 337 to be in the state shown in FIG.

  As shown in FIG. 15, each blade member 34 has a hole 326 provided in the fitting portion 324 (see FIG. 7) of the main plate 32 and a hole provided in the fitting portion 334 of the shroud 33 (see FIG. 12). A protrusion 345 that is fitted into the portion 336 is provided. The protrusions 345 have a cylindrical shape, and three are provided on the top 34T and the bottom 34B of the blade member 34, respectively. In addition, in FIG. 15, the shape of the blade member 34 is the same shape (straight) from the top to the bottom of the positive pressure surface that pushes out the wind and the opposite surface. Further, the blade member 34 may have a shape in which the positive pressure surface and the negative pressure surface have a required curved surface shape in order to realize the air blowing characteristics of the turbo fan 30. Furthermore, since there are a plurality of blade members 34, the blade members 34 may be hollowed by a method such as blow molding in order to reduce the weight of the turbofan.

  As shown in FIG. 14, the main plate 32, the shroud 33, and the blade member 34 configured as described above are temporarily assembled by fitting the blade member 34 into the fitting portion 324 of the main plate 32 and the fitting portion 334 of the shroud 33. The temporary assembly is referred to as a workpiece below. At this time, the projections 345 of the blade portions 34 are fitted into the hole portions 326 of the fitting portions 324 of the main plate 32 and the hole portions 336 of the fitting portions 334 of the shroud 33. At this time, the bottom part 34B of the blade part 34 and the welding edge 327 in the fitting part 324 of the main plate 32 come into contact with each other, and the state shown in FIG. The top part 34T of the blade part 34 and the welding edge 337 in the fitting part 334 of the shroud 33 come into contact with each other, and the state shown in FIG. The blade member 34 is guided by the wall portion 325 of the fitting portion 324 of the main plate 32 and the wall portion 335 of the fitting portion 334 of the shroud 33, and the hole 326 in the fitting portion 324 of the main plate 32 and the protrusion 345 of the blade member 34. And the hole 336 of the fitting portion 334 of the shroud 33 and the protrusion 345 of the blade member 34 are fitted, so that the workpiece before ultrasonic welding can secure a stable posture.

  The work temporarily assembled in this way is placed on a jig of an ultrasonic welding machine. The horn of the ultrasonic welding machine contacts and pressurizes a predetermined position of the shroud 33 of the workpiece, and the welding edges 327 and 337 are melted to integrate the workpiece. As shown in FIG. 14, the main plate 32 may be set on the jig as shown in FIG. 14, or the work piece is reversed and the shroud 33 is set on the jig. Also good.

  In the process of ultrasonic welding, the configuration of the fitting portion 324 of the main plate 32, the configuration of the fitting portion 334 of the shroud 33, and the protrusion 345 of the blade member 34 interact with each other, so that each member is not displaced. The main plate 32, the shroud 33, and the blade portion 34 can be uniformly ultrasonically welded in a stable posture. Therefore, the turbofan 30 with stable quality can be obtained by ultrasonic welding.

  Further, by making the hole 326 (main plate 32 side) and the hole 336 (shroud 33 side) through-holes, the same effects as the turbo fan 10 of the first embodiment and the turbo fan 20 of the second embodiment are exhibited. To do.

DESCRIPTION OF SYMBOLS 10 Turbofan 12 Main plate 121 Boss 122 Hub 124 Fitting part 125 Wall part 126 Hole part 127 Welding edge 13 Shroud with blade 131 Shroud 132 Opening part 133 Peripheral part 134 Blade part 134B Bottom part 134S Side part 135 Projection K Indentation part

Claims (8)

A main plate having a boss fixed to the rotation shaft of the motor in the center and a shroud with blades provided with a plurality of blade portions are separately molded with a thermoplastic resin,
A turbofan in which the bladed shroud is integrated with the main plate by ultrasonic welding,
Each blade portion of the bladed shroud includes at least one protrusion,
The said main plate is provided with the fitting part A with the blade | wing part of the said shroud with a blade | wing, The said fitting part A provided the hole part which fits the said protrusion. The turbofan characterized by the above-mentioned.   The shape of the projection on the at least one blade portion and the hole on the main plate side corresponding to the blade portion in the turbofan is the shape of the protrusion on the other blade portion and the hole portion on the main plate side corresponding to the blade portion. The turbofan according to claim 1, wherein the turbofan is different from the turbofan.   The turbo fan according to claim 1, wherein the fitting part A is provided in a standing wall shape surrounding the periphery of the blade part fitted into the fitting part A.   The turbofan according to any one of claims 1 to 3, wherein a welding edge is provided in the fitting portion A with the shroud with blades of the main plate.   The turbo according to any one of claims 1 to 4, wherein a welding edge provided in the fitting portion A with the shroud with blades of the main plate is provided in the center of the fitting portion A. fan.   The turbofan according to any one of claims 1 to 5, wherein the hole has a penetrating shape. A winged main plate having a boss fixed to the rotation shaft of the motor at the center and having a plurality of blade portions, and a shroud are separately molded with a thermoplastic resin,
A turbofan in which the bladed main plate is integrated with the shroud by ultrasonic welding,
Each blade portion of the bladed main plate includes at least one protrusion,
The said shroud is equipped with the fitting part B with the blade | wing part of the said main plate with a blade | wing, The hole part which fits the said protrusion in the said fitting part B was provided. The turbofan characterized by the above-mentioned. A main plate having a boss fixed to the rotation shaft of the motor at the center, a shroud, and a plurality of blade members are separately molded with a thermoplastic resin,
A turbofan in which the plurality of blade members are integrated with the main plate and the shroud by ultrasonic welding,
The blade member includes at least two protrusions,
The main plate includes a fitting portion C with the plurality of blade members,
The shroud includes a fitting portion D with the plurality of blade members,
The turbo fan according to claim 1, wherein the fitting portion C and the fitting portion D are provided with a hole portion into which the protrusion of the blade member is fitted.

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