JP2021014795A - Turbo fan - Google Patents

Abstract

To provide a turbo fan of which blade member having a curved shape can be molded while being positioned in a mold jig and fixed when being integrally molded with a main plate, thereby maintaining fluidity of a resin at integral molding and ensuring an air flow rate.SOLUTION: In a turbo fan, a blade member 27 includes blade body parts 42, 48 and a flange part 43, the flange part 43 is formed while extending on an outside more than projection surfaces of the blade body parts 42, 48 and a positioning part 80 for positioning the blade member 27 relative to a main plate 24 is formed in the flange part 43.SELECTED DRAWING: Figure 7

Description

The present invention relates to a turbofan, and more particularly to a turbofan capable of stably supporting a blade member and making it possible that the main plate and the blade member are less likely to be displaced even when the blade member is distorted in the centrifugal direction.

Conventionally, a turbofan which is mounted on an indoor unit of an air conditioner and has a main plate and a plurality of blades integrally molded and a shroud is known.

As such a turbofan, conventionally, for example, a wing is erected on a main plate and joined to a shroud with almost no curvature, so that the wing and the main plate are fixed to a jig when integrally molded. A technique is disclosed in which the base of the blade can be pressed with a jig without being formed large, and the fan body is integrally molded with a thermoplastic resin (see, for example, Patent Document 1).

JP-A-2007-120445

However, in recent turbofans, in order to secure the air volume, the shape is curved and the blade members tend to be inclined with respect to the main plate. Therefore, the mounting angle between the main plate and the shroud with respect to the blade members is different. The blade member may be formed in a twisted shape.

Therefore, when the blade member and the main plate are integrally molded, the flange portion of the blade member to be fixed to the mold jig needs to be formed so as to project from the curved projection surface. For this reason, the flange portion becomes large, the gap formed between the flange portions of the adjacent blade members becomes narrow, and the fluidity when the thermoplastic resin injected during integral molding flows through this gap may decrease. It was.

Further, in the pre-step of integral molding, there is a problem that the angle of the blade member fixed to the main plate is held so as not to be displaced, and the blade member is positioned so as not to cause a further air volume resistance.

The present invention has been made in view of the above points, and since a blade member having a curved shape can be positioned and fixed to a mold jig during integral molding with a main plate, it can be molded. The purpose is to provide a turbofan that maintains the fluidity of the resin and secures the air volume.

In order to achieve the above object, the present invention is a turbo fan including a main plate, a shroud, and a plurality of curved blade members between the main plate and the shroud, wherein the blade members are a blade main body portion and a flange portion. The flange portion is formed so as to extend outward from the projection surface of the blade main body portion, a positioning portion for positioning the blade member with respect to the main plate is formed on the flange portion, and the positioning portion is the said. It is characterized by having a detent function for preventing the blade member from rotating and moving.

Further, the blade member is formed of a positive pressure side blade member and a negative pressure side blade member, the positive pressure side blade member has a positive pressure surface portion and a flange portion of the blade main body portion, and the negative pressure side blade member is said. It has a negative pressure surface portion of the blade main body portion, the blade main body portion is arranged so that the positive pressure surface portion and the negative pressure surface portion face each other, and the flange portion faces the direction opposite to the rotation direction on the negative pressure surface portion side. It is characterized in that the positioning portion is formed at the end portion of the flange portion.

Further, the positioning portion is a hole portion, and the detent function is characterized in that the hole portion has a different shape other than a circular shape.

Further, the gap portion formed between the flange portions of the adjacent blade members is formed large from the rotation axis toward the outside, and the gap portion is covered with resin and integrally molded.

Further, the positioning portion is fixed to a positioning pin provided on a jig for integrally molding the main plate.

According to the present invention, the blade member can be formed without deviation from the main plate, and noise can be reduced.

It is a vertical sectional view which shows the embodiment of the ceiling-embedded air conditioner to which the turbofan of this invention is applied. It is a perspective view of the ceiling-embedded air conditioner of this embodiment. It is a bottom view of a turbofan. It is a perspective view of a turbofan. It is an exploded perspective view of a turbofan. It is a schematic of the insert of the blade member. It is an enlarged view of a main part.

Hereinafter, embodiments of the turbofan according to the present invention will be described with reference to the drawings.

FIG. 1 is a vertical cross-sectional view showing an embodiment of a ceiling-embedded air conditioner to which a turbofan according to the present invention is applied. FIG. 2 is a perspective view of a ceiling-embedded air conditioner.

In the present embodiment, as shown in FIG. 1, the indoor unit 10 is installed in the ceiling space 13 between the ceiling 11 of the building and the ceiling plate 12 installed below the ceiling 11.

As shown in FIG. 1, the indoor unit 10 includes a box-shaped air conditioner main body 14 having an open lower surface, and a hanging metal fitting 18 is attached to an outer corner of the air conditioner main body 14. Is installed. The air conditioner main body 14 is installed in a state of being suspended from the ceiling 11 by a suspension bolt 15 connected to the suspension metal fitting 18. Inside the air conditioner main body 14, a styrofoam heat insulating member 16 is arranged in contact with the inner surface of the side plate 17 of the air conditioner main body 14 to prevent dew condensation on the side plate 17.

A fan motor 21 is attached to the lower surface of the upper plate of the air conditioner main body 14, so that the rotary shaft 22 that is rotationally driven by the drive of the fan motor 21 extends downward to the fan motor 21. It is provided. A turbofan 23 is attached to the lower end portion of the rotating shaft 22, and the fan motor 21 and the turbofan 23 constitute a blower device 20.

The turbofan 23 includes a main plate 24 formed in an annular plate shape. An inverted truncated cone-shaped motor accommodating portion 25 extending downward is formed in the central portion of the main plate 24.

The fan motor 21 is housed in the motor housing part 25, and the rotating shaft 22 of the fan motor 21 extends downward and is connected to the bottom surface of the motor housing part 25. Then, by rotationally driving the fan motor 21, the turbofan 23 is configured to rotate via the rotary shaft 22.

A shroud 26 is provided below the main plate 24, and the shroud 26 is formed in an annular shape having an arc-shaped peripheral surface. Between the main plate 24 and the inner peripheral surface of the shroud 26, there are a plurality of curved blade members 27 arranged at predetermined intervals in the circumferential direction, and the blade members 27 are integrally molded with the main plate 24.

An orifice 28 is arranged below the shroud 26, and the orifice 28 is formed in an annular shape having an arc-shaped peripheral surface.

Between the blower 20 and the heat insulating member 16, a heat exchanger 30 formed in a substantially square shape in a plan view is arranged so as to surround the side of the blower 20.

The heat exchanger 30 is a heat exchanger 30 that functions as a refrigerant evaporator during the cooling operation and as a refrigerant condenser during the heating operation. The heat exchanger 30 exchanges heat between the indoor air sucked into the air conditioner main body 14 and the refrigerant, cools the air in the air conditioning room during the cooling operation, and heats the indoor air during the heating operation. It is configured to be able to.

Further, on the lower side of the heat exchanger 30, a drain pan 31 is arranged so as to correspond to the lower surface of the heat exchanger 30. The drain pan 31 is for receiving the drain water generated in the heat exchanger 30. Further, a suction port 32 of the blower 20 is formed in the central portion of the drain pan 31.

Further, as shown in FIGS. 1 and 2, a substantially square decorative panel 33 is attached to the lower surface of the air conditioner main body 14 so as to cover the lower opening of the air conditioner main body 14.

A suction port 34 communicating with the suction port 32 of the drain pan 31 is formed in the central portion of the decorative panel 33, and a suction grill 35 covering the suction port 34 can be attached to and detached from the suction port 34 portion of the decorative panel 33. It is attached. A filter 36 for removing dust and the like in the air is provided on the air conditioner main body 14 side of the suction grill 35.

An air outlet 37 for sending air after air conditioning into the room is formed at a position outside the suction port 34 of the decorative panel 33 and along each side of the decorative panel 33. Each outlet 37 is provided with a flap 38 for changing the wind direction. Then, the rotary shaft 22 is rotationally driven by the fan motor 21 to rotate the turbofan 23, so that the air in the room is sucked from the suction ports 32 and 34, passes through the filter 36, and then passes through the heat exchanger 30. The air is exchanged by heat, and the air after air conditioning is sent into the room from the air outlet 37.

Next, the turbo fan will be described in more detail.

FIG. 3 is a bottom view of the turbofan. FIG. 4 is a perspective view of the turbofan. FIG. 5 is an exploded perspective view of the turbofan.

In the turbofan 23, the shroud 26, the main plate 24, and a plurality of curved blade members 27 are integrally molded in advance, and after manufacturing each of these, they are assembled to form the turbofan 23. There is.

FIG. 4 shows a state in which the thermoplastic resin 50 is integrally molded with the main plate 24 between the flange portions 43 of the plurality of blade members 27, and the outer peripheral shape of the flange portion 43 is in the direction opposite to the fan rotation direction. It is configured in a substantially arcuate curved shape, and the gap 44 formed between the flange portions 43 of the adjacent blade members 27 during injection molding is also configured in the direction opposite to the fan rotation direction, and is formed from the rotation shaft 45. It is formed so as to spread widely in the direction of moving away.

In the present embodiment, as shown in FIG. 5, the blade member 27 includes a positive pressure side blade member 40 located on the positive pressure side and a negative pressure side blade member 41 located on the negative pressure side, and these two blade members are provided. A single blade member 27 is formed by being brought into contact with each other.

The positive pressure side blade member 40 includes a blade main body 42 forming a positive pressure side surface and a flange portion 43 extending the bottom plate of the blade main body 42, and the flange portion 43 lowers the bottom plate of the negative pressure side blade member 41. It is formed toward the negative pressure surface side so as to receive from the fan, and further extends in the direction opposite to the rotation direction of the fan.

A hole portion serving as a positioning portion 80 is formed at an end portion of the flange portion 43 extending in the direction opposite to the rotation direction of the fan. The positioning portion 80 is arranged on the main plate 24 at a substantially central portion of the positive pressure side blade member 40 of the adjacent blade members 27.

Further, a stepped welding support portion 46 formed at different heights is formed on the upper portion of the positive pressure side blade member 40. The upper surface of each step of the welding support portion 46 is a flat surface, and as shown in FIG. 5, a welding pin 47 is provided so as to project from each of the welding support portions 46.

The blade member 27 is integrally molded with the main plate 24 via the flange portion 43.

Further, the negative pressure side blade member 41 includes a blade main body 48 forming a surface on the negative pressure side. An engaging pin (not shown) is formed on the inner surface of the blade body 42 of the positive pressure side blade member 40, and an engaging recess on which the engaging pin is engaged is formed on the inner surface of the blade body 48 of the negative pressure side blade member 41. (Not shown) is formed.

FIG. 6 shows a state before fixing the plurality of blade members 27 to the mold jig 81. The blade main bodies 42 and 48 of the blade member 27 are inserted into the predetermined positions of the mold jig, and the flange portions 43 are fixed to the predetermined positions of the mold jig 81.

At this time, the positioning portion 80 provided at the end of the flange portion 43 may engage with the positioning pin 82 provided in the mold jig 81 to fix the blade member 27 at a predetermined position of the mold jig 81. it can.

As shown in FIG. 7, the positioning portion 80 rotates so as to prevent the blade member 27 from rotating when mounted on the positioning pin 82 of the mold jig 81, and to prevent the blade member 27 from rotating and to be maintained at a predetermined position. A stop function is configured.

Specifically, the positioning portion 80 is formed of a deformed shape other than a circular shape, and in the case of the embodiment, specifically, it is a substantially D-shaped hole portion and is inserted into a positioning pin 82 having the same shape. As a result, the mold jig 81 is arranged at a predetermined position without being displaced. Further, by providing only one positioning portion 80 on the flange portion 43, the blade member 27 can be prevented from rotating and rotational movement can be suppressed even in the mold jig 81 vertically placed as shown in FIG.

Then, by injecting a thermoplastic resin into the mold jig 81 and performing so-called insert molding, the resin flows in the gap portion 44 formed between the flange portions 43 of the plurality of blade members 27, and the adjacent flange portions Since the main plate 24 is formed by connecting the 43, the blade member 27 with respect to the main plate 24 can be integrally molded by the positioning portion 80 without any deviation.

Further, the gap portion 44 has a width widening from the central rotation shaft 45 toward the outside, and it is possible to suppress a decrease in the fluidity of the resin during molding.

Then, by integrally molding the blade member 27 and the main plate 24 and then joining the shroud 26, it is possible to provide the turbofan 23 that suppresses the air volume variation due to the variation during the integral molding and secures a predetermined air volume.

Further, when the turbofan 23 is operated, the holes forming the positioning portion 80 formed in the flange portion 43 do not protrude from the flange portion 43, and the positioning portion 80 is only one place, so that the air flowability. The air volume can be secured without disturbing the air, and the wind noise can be suppressed.

Although the positioning portion 80 has a substantially D-shaped hole, it may be prevented from rotating and may have a rectangular cross section or a notch shape.

Further, although the positioning portion 80 is a hole portion, it may be a protrusion portion. In this case, since the protrusion protrudes to the side opposite to the side where the blade member of the main plate is formed, the air volume can be secured without disturbing the air flow due to the rotation of the fan, and the wind noise can be suppressed. ..

Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the above embodiments and can be modified without departing from the gist of the invention.

10 Indoor unit 14 Air conditioner body 24 Main plate 23 Turbofan 26 Shroud 27 Blade member 40 Positive pressure side blade member 41 Negative pressure side blade member 42, 48 Blade body 43 Flange part 80 Positioning part

Claims (5)

In a turbofan provided with a main plate, a shroud, and a plurality of curved blade members between the main plate and the shroud, the blade member has a blade main body portion and a flange portion, and the flange portion has the blade portion. A positioning portion is formed on the flange portion so as to extend outward from the projection surface of the main body portion and position the blade member with respect to the main plate, and the positioning portion prevents the blade member from rotating and moving. A turbofan characterized by having a detent function. The blade member is formed of a positive pressure side blade member and a negative pressure side blade member, the positive pressure side blade member has a positive pressure surface portion and a flange portion of the blade main body portion, and the negative pressure side blade member is the blade main body. The blade body portion has a negative pressure surface portion, the positive pressure surface portion and the negative pressure surface portion are arranged facing each other, and the flange portion extends in a direction opposite to the rotation direction on the negative pressure surface portion side. The turbo fan according to claim 1, wherein the positioning portion is formed at an end portion of the flange portion. The turbofan according to claim 1 or 2, wherein the positioning portion is a hole portion, and the anti-rotation function is characterized in that the hole portion has a different shape other than a circular shape. Claim 1 is characterized in that a gap portion formed between the flange portions of the adjacent blade members is formed large from the rotation axis toward the outside, and the gap portion is covered with a resin and integrally molded. Or the turbofan described in 2. The turbofan according to any one of claims 1 to 3, wherein the positioning portion is fixed to a positioning pin provided on a jig for integrally molding the main plate.

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