JP4649972B2 - Blower and air conditioner equipped with it - Google Patents

Description

  The present invention relates to a turbo fan type blower, and more particularly to a configuration in which flow separation is prevented and air blowing efficiency is improved, while a mold structure is simplified to reduce manufacturing costs.

  For example, as shown in the front view of FIG. 6A and the cross-sectional view of FIG. 6B, the conventional turbofan blower 30 is formed with an annular shroud 32 having an inflow opening at the center and a boss. And a plurality of blades connected to the shroud 32 and arranged on the outer peripheral side of the hub 31 with a constant inclination angle with respect to the diametrical direction. When the drive motor 34 is rotationally driven, ambient air is sucked from the inlet of the shroud 32 and air is radially sent out by the action of the blade 33.

  The tip portion located on the outer peripheral surface side of the blade 33 is formed so that the thickness gradually increases from the center side toward the outer peripheral end side, as shown in the sectional view of FIG. This increases the pressure on the pressure side, which is the direction of rotation, and improves the air discharge rate, while preventing air separation on the negative pressure side, which is the back side of the pressure surface, and reducing noise generation as much as possible. (For example, refer to Patent Document 1).

  As another method, the blade 33 is formed as an overall twisted surface to increase the pressure on the pressure surface side and improve the air discharge amount, while the air pressure on the negative pressure surface side which is the back surface on the pressure surface side is increased. There is also an example of preventing the peeling phenomenon.

  However, in many cases, the blade 33 is integrally formed on the circumference of the hub 31 by resin molding, and as described above, the blade 33 is formed so as to gradually increase in thickness toward the outer peripheral end side, or as a whole. If it is going to be formed so as to be a torsional surface, not only the cavity and core as a mold structure, but also a slide structure that is inserted between the blades and pulled out to the outer peripheral surface side and a link mechanism or piston that drives it A mechanism is required, which not only increases the size of the mold but also increases the complexity of the structure. This is reflected in the manufacturing unit price, which increases the cost.

JP 2001-107892 (page 3, FIG. 3)

  In view of the above problems, the present invention increases the pressure on the pressure surface side of the blade and improves the air discharge amount to improve the blowing efficiency, while the air pressure on the negative pressure surface side serving as the back surface on the pressure surface side is increased. An object of the present invention is to provide a blower that prevents the occurrence of noise by preventing the peeling phenomenon and that reduces the manufacturing cost as much as possible by eliminating the need for a slide structure in the mold.

  In order to solve the above-mentioned problems, the present invention is formed in a disk shape, on a peripheral surface, a hub provided with a plurality of main blades having joint edges, and formed in an annular shape with a central portion as an inlet, A secondary blade is provided at the rear end portion of the main blade on the suction surface side, and a blower is constituted by a shroud joined to the hub by the joining edge and a drive motor pivotally attached to the hub. The main blade is formed integrally with the hub. The hub is formed by molding with a mold having a cavity and a core that do not have an undercut shape. In addition, a heat exchanger is provided in the main body having the suction port and the air outlet, and a hub having a plurality of main blades having joint edges on the peripheral surface, and an annular shape having a central portion as an inlet. A blower comprising a shroud that is formed on the suction surface side rear end of the main blade and that is joined to the hub by the joining edge, and a drive motor that is attached to the hub. An air conditioner is provided.

  According to the present invention, a plurality of main blades having a constant inclination angle with respect to the radial direction are integrally formed on a disk-shaped hub, while being formed in a convex shape on the inner wall of the shroud formed in an annular shape. The plurality of sub-blades are integrally provided, and the sub-blades are arranged in close contact with one side of the upper rear edge portion of the main blade through a minute gap. This prevents flow separation on the suction surface side of the main blade to reduce noise and improve discharge efficiency. In addition, the main blade is not twisted, and the thickness in the cross section is almost constant, so the mold that forms the main blade does not require a slide structure, the outer dimensions of the mold are reduced, and the structure is simple The manufacturing cost of the blower including the hub and the shroud can be reduced.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.

  FIG. 1 is a cross-sectional view of a ceiling-embedded air conditioner using a turbofan blower according to the present invention. FIG. 2A is a perspective view of the blower according to the present invention, and FIG. 2B is a side view. FIG. 3 is an exploded perspective view, and FIGS. 4A and 4B are cross-sectional views showing the first embodiment. FIGS. 5A and 5B are sectional views showing a second embodiment.

  First, a ceiling-embedded air conditioner, which is a type of air conditioner incorporating a blower according to the present invention, will be described. As shown in FIG. 1, the ceiling-embedded air conditioner is mounted on a polygonal casing 1 that is suspended from a ceiling inner wall surface by a plurality of suspension bolts, and an open lower surface of the casing 1. The outer panel is constituted by the decorative panel 2 that is in close contact with the surface.

  The decorative panel 2 is formed with a suction port, and a suction grille having a filter 2a attached to the back surface thereof is freely opened and closed. Yes. A blower 5 according to the present invention and a heat exchanger 4 are disposed so as to surround the blower 5 in the air flow path connecting the suction port and the blower outlet 3. The sucked indoor air is sent to the heat exchanger 4 to exchange heat, and then sent out from the air outlet 3 into the room again.

  The blower 5 is disposed between the shroud 7 and the hub 6, an annular shroud 7 having an inlet opening facing the suction grille, a hub 6 having a central portion protruding downward in a bell shape. A plurality of main blades 8 and a drive motor 9 fixed to the upper surface wall of the casing 1 by screws or the like, and having a rotary shaft 9a attached to the hub 6 of the blower 5; 9, when the hub 6, the shroud 7 and the main blade 8 rotate together, air is sucked from the inlet of the shroud 7 as shown by an arrow in FIG. With rotation, air is discharged radially toward the heat exchanger 4.

  Next, the detailed structure of the blower 5 will be described. As shown in the exploded perspective view of FIG. 2, the blower 5 excluding the drive motor 9 is formed by integrally forming a hub 6 in which a plurality of main blades 8 are integrally formed on a circumference and a sub blade 10 on an inner wall. The shroud 7 is integrated, and the hub 6 and the shroud 7 are joined together as a blower.

  The hub 6 is formed in a disk shape having a central portion 6a protruding in a bell shape, and a plurality of main blades 8 are integrally formed on the circumference thereof. The main blade 8 is disposed on the hub 6 with a constant inclination angle with respect to the radial direction, and includes a joining edge 8a that joins to the inner wall surface of the shroud 7 by notching the upper part on the outer peripheral side obliquely. The cross section of the main blade 8 in the lateral direction has a wing shape in which one end bulges in a circular shape and the other end is sharpened. A boss 6b having an insertion hole for attaching the rotating shaft 9a of the drive motor 9 is formed at the upper portion of the central portion 6a.

  The shroud 7 is provided with a circular inflow port 7a in the center, and is formed in an annular shape with a cross section having a concave arc shape. The inner wall of the shroud 7 has a convex outer shape, from the inner peripheral side to the outer peripheral side. A plurality of sub-blades 10 formed so as to gradually increase the wall thickness are formed integrally. The secondary blade 10 is arranged on one side of the upper rear edge portion of the main blade 8 formed on the hub 6 in close contact or with a minute gap. When the joining edge 8a formed on the upper part of the main blade 8 is fixed to the inner wall surface of the shroud 7 by ultrasonic welding or an adhesive, the hub 6 and the shroud 7 are shown in FIG. As shown, the main blade 8 and the sub blade 10 are overlapped with each other.

  FIG. 4A is a top view showing a state where the hub 6 and the shroud 7 are joined. FIG. 4B shows the cross-sectional shape of the blade at each cut surface shown in FIG. In FIG. 2B, the thickness of the CC cross section on the hub 6 side and the BB cross section at the substantially central portion is substantially constant, but the A- on the shroud 7 side. In the A section, the main blade 8 and the sub-blade 10 are arranged. As shown in FIG. 4B, the secondary blade 10 is disposed on the main blade 8 so as to extend from the outer peripheral end side of the main blade 8.

  The main blade 8 and the sub-blade 10 function as a single blade, so that when the main blade 8 rotates at a high speed, the sub-blade 10 is placed on the suction surface side of the main blade 8 opposite to the rotation direction. A laminar flow that gently bends along the surface is generated, and a vortex is generated to prevent the flow from separating from the blade surface as much as possible, while preventing the generation of noise and improving the blowing efficiency. It has become.

  Next, a second embodiment will be described. In the second embodiment, as shown in FIGS. 5A and 5B, the cross-sectional shapes of the main blade 11 and the sub blade 12 are different from those of the first embodiment. As shown in the CC sectional view and the BB sectional view of FIG. 5B, the main blade 11 has a minute recess shape by notching the rear end portion on the high pressure surface side which is the rotational direction. In the AA cross section on the shroud 7 side, the secondary blade 12 is disposed on the primary blade 11, and the secondary blade 12 has a mountain shape so as to slightly protrude toward the suction surface side.

  By making the rear end notch into a minute concave shape, a static pressure is obtained on the high pressure surface side, while the sub blade 12 projects the suction surface side in a slightly mountain shape, thereby causing a reverse flow phenomenon of the separated flow. The air resistance when the blade rotates is reduced.

  Next, a method for manufacturing the hub 6 and the shroud 7 will be described. As described above, the hub 6 integrated with the main blade 8 is formed by injection molding using a resin material, and the shroud 7 integrated with the auxiliary blade 10 is also formed by injection molding. It has become. When the hub 6 and the shroud 7 are combined, the auxiliary blade 10 formed in a convex shape is disposed on one side of the rear edge of the main blade 8 so that the thickness of the rear end of the blade increases. The characteristics of the blade are improved, the shape of the main blade 8 is simplified, and the mold that integrally forms the main blade 8 and the hub 6 does not have an undercut shape, thereby eliminating the need for a slide structure. It has become. Accordingly, the mold can be miniaturized, and the slide structure and the drive mechanism for driving the slide structure are not required, and the mold structure can be simplified. Further, by arranging the auxiliary blade 10 on the main blade 8, the generation of vortex is prevented, the separation of the flow is prevented, and the aerodynamic performance is improved.

  If the mold structure is simplified, the cost of mold production can be reduced, and the molding time for injection molding can be shortened, so that the manufacturing cost of the blower 5 including the hub 6 and the shroud 7 can be reduced. As a result, the cost of an air conditioner such as a ceiling-embedded air conditioner that uses this can be reduced.

It is sectional drawing which shows a ceiling embedded type air conditioner. (A) is a perspective view of a blower according to the present invention. (B) is a side view thereof. It is a disassembled perspective view of the air blower by this invention. (A) is a top view in the first embodiment. (B) is sectional drawing of the braid | blade in each cut surface. (A) is a top view in the second embodiment. (B) is sectional drawing of the braid | blade in each cut surface. It is sectional drawing of the air blower by this invention. (A) is a front view of the air blower by a prior art example. (B) is a sectional view thereof. (C) is sectional drawing which shows the edge part of a braid | blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Decorative panel 2a Filter 3 Outlet 4 Heat exchanger 5 Blower 6 Hub 6a Center part 6b Boss 7 Shroud 7a Inlet 8 Main blade 8a Joint edge 9 Drive motor 9a Rotating shaft 10 Sub blade 11 Main blade 12 Sub blade

Claims (4)

  It is formed in a disc shape, and is formed in an annular shape with a plurality of main blades provided with joint edges on the peripheral surface and an inflow port at the center, and at the suction surface side rear end of the main blade A blower comprising a shroud provided with a secondary blade to be arranged and joined to the hub by the joining edge, and a drive motor pivotally attached to the hub.   The blower according to claim 1, wherein the main blade is formed integrally with the hub.   The blower according to claim 2, wherein the hub is formed by a mold including a cavity having no undercut shape and a core.   A heat exchanger is provided in the main body equipped with an inlet and an outlet, and a hub with a plurality of main blades having joint edges on the peripheral surface, and an annular shape with the central portion as an inlet. A sub-blade disposed at the suction surface side rear end of the main blade, and a blower including a shroud joined to the hub by the joint edge and a drive motor pivotally attached to the hub. An air conditioner characterized by that.

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