JP3668782B2 - Blower fan and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
[0002]
The present invention relates to a structure of an impeller of a blower fan such as a turbofan and a manufacturing method thereof.
[Prior art]
[0003]
FIG. 8 shows a structure of a conventional general ceiling-embedded air conditioner 1, and FIGS. 9 and 10 show a turbofan as an example of a conventional blower fan applied to the ceiling-embedded air conditioner. The structure of two types of impellers with different rotation directions is also shown.
[0004]
First, in FIG. 8, reference numeral 2 denotes a cassette-type main body casing of the ceiling-embedded air conditioner 1. The main body casing 2 is embedded in the ceiling 3 such that its intake / blowout panel (lower surface panel portion) 4 continues in substantially the same plane as the ceiling 3.
[0005]
The intake / blowout panel 4 of the main body casing 2 is provided with a square air suction grille 5 at the center, and further, a bell mouth 15 for the turbofan impeller 11 is continuously provided therein. . Further, air blowout ports 9, 9... Having a predetermined width are provided on the outer peripheral portion 4 side of the air suction grille 5 of the intake / blowout panel 4 of the main body casing 2.
[0006]
On the other hand, a ventilation passage 10 is formed in the body casing 2 from the air suction grille 5 through the bell mouth 15 to the air outlets 9, 9,. The turbofan impeller 11 whose air suction side (the shroud 6 side described later) corresponds to the bell mouth 15 is located at the center of the main plate 14. The integrally formed boss portion 14 a is suspended by being fixed to the ceiling panel 2 a of the main body casing 2 via the rotational drive shaft 13 a of the fan motor 13 and the fan motor 13.
[0007]
Further, an air heat exchanger 12 is provided in the ventilation path 10 so as to surround the turbofan impeller 11.
[0008]
On the other hand, the turbo fan impeller 11 has a cross-section inverted hat in which the vicinity of the central boss portion 14a fixed to the rotational drive shaft 13a of the fan motor 13 is high in the air suction direction and has an edge portion 14b having a predetermined width on the outer periphery. -Shaped main plate (hub) 14 and a funnel-shaped shroud 6 in which a central-side opening edge 6a that forms an air suction port in the centrifugal direction in the turbofan impeller 11 has a small diameter and gradually increases in diameter toward the outer peripheral edge 6b. Are arranged in parallel in the circumferential direction with a predetermined blade angle and a predetermined blade interval according to the rotational direction. Further, in the air suction side end portion 6a of the shroud 6, a downstream air outlet side end portion 15b of the bell mouth 15 is loosely fitted with a predetermined dimension so as to be relatively rotatable with a predetermined gap.
[0009]
The air inlet of the bell mouth 15 is air from the air inlet grill 5 on the main casing 2 side with respect to the air inlet side end 6a of the shroud 6 forming the air inlet of the impeller 11 of the turbofan. In order to smoothly flow in the centrifugal fan impeller 11 in the centrifugal direction, it extends inwardly from the mounting edge 15a to the intake / blowout panel 4 as shown in the figure, and gradually increases from the air flow upstream side to the air flow downstream side. It has an airflow guide surface that reaches an air outlet 15b through an air inlet having a predetermined radius of curvature with a reduced opening diameter. And by corresponding to the shroud 6 of the turbofan impeller 11 by its shape, the air on the suction side of the turbofan impeller 11 is guided as smoothly as possible in the blowout-side centrifugal direction on the suction side. The aerodynamic noise generated at the time of blowing is reduced as much as possible.
[Problems to be solved by the invention]
[0010]
By the way, in the case of the impeller 11 of the conventional blower fan, the main plate 14 and the moving blade blades 16, 16... Are generally integrated, and the shroud separately formed for the blades 16, 16. 6 is joined. The main plate 14 and the blades 16, 16... Are integrally formed by injection molding using synthetic resin such as AS resin or ABS resin.
[0011]
Therefore, for example, when manufacturing two types of impellers 11 having different rotational directions as shown in FIGS. 9 and 10, for example, two types of blades 16a, 16a,. ································································································································ Must be manufactured separately. Therefore, two types of molds having a complicated structure for manufacturing the main plate and the blades are necessary, which inevitably increases the manufacturing cost.
[0012]
The present invention has been made to solve such problems, and is symmetrical with respect to the center height in the rotational axis direction so that the shape of each blade of the blower fan impeller can be shared in different rotational directions. formed into a shape, and the vertically reversed, by integrally bonding the main plate or the shroud, and configured to implement two types of blower fan impeller having different blade rotating direction, as such By manufacturing, it is possible to simultaneously provide two types of impellers having different rotational directions at low cost with at least three types of molds having a simple structure of a main plate, a moving blade blade, and a shroud. It is intended.
[Means for Solving the Problems]
[0013]
In order to achieve the above object, each invention of the present application includes the following problem solving means.
[0014]
(1) Invention of Claim 1 The blower fan of the present invention includes a main plate 14 that is rotationally driven, a shroud 6 having an air suction port, and a plurality of blades 26 a provided between the main plate 14 and the shroud 6. , 26a · · ·, 26b, the blower fan 11 comprising a 26b · · ·, as each vane 26a, 26a · · ·, 26b, the 26b · · ·, be shared in different rotational directions, the rotation for the axial direction of the blade center height formed into symmetrical shape, it is characterized in that integrally joined with the main plate 24 or the shroud 6 on either side of both ends in the height direction.
[0015]
According to this structure, molding the blades 26a, 26a · · ·, 26b, the 26b · · ·, as may be shared in a different direction of rotation, symmetric shape for the blade center height of the rotational axis The main plate 24 or the shroud 6 can be joined to either side of the both ends in the height direction, and the rotational direction is made different only by reversing the vertical relationship during the joining. Two types of impellers for blower fans can be formed simultaneously.
[0016]
Therefore, the molds for forming the impeller 11 of two types of blower fans having different rotation directions are the same shape of the blades 26a, 26a..., 26b, 26b. There are only three simple structures, and the rotational direction can be reduced at a very low cost compared to the case where the main plate and the blades are integrated with two types of molds with a complicated structure as in the past. It becomes possible to form the impeller 11 of two different types of blower fans.
[0017]
(2) Invention of Claim 2 The blower fan of the present invention is the structure of the invention of Claim 1, wherein the blades 26a, 26a..., 26b, 26b. Are provided with concave and convex engaging portions 27, 28, 27, 28.
[0018]
According to such a configuration, if the concave and convex engaging portions 27, 28, 27, 28,... Are engaged with each other and finally ultrasonically welded as described later, for example, bonding can be easily performed. It can be integrated.
[0019]
(3) Invention of Claim 3 The manufacturing method of the ventilation fan of this invention is the plurality of sheets provided between the main plate 14 to be rotationally driven, the shroud 6 having the air suction port, and the main plate 14 and the shroud 6. blades 26a of, 26a · · ·, 26b, upon manufacturing the blowing fan comprising a 26b · · ·, firstly the respective blades 26a, 26a · · ·, 26b, the 26b · · ·, shared in different rotational directions as can be, formed into symmetrical shape about the blade center height of the rotation axis direction, then so bonded integrally with the main plate 24 or the shroud 6 on either side of both ends in the height direction Thus, it is characterized in that the impellers 11 of two types of blower fans having different rotation directions are manufactured at the same time.
[0020]
According to such a configuration, first the blades 26a, 26a · · ·, 26b, the 26b · · ·, as may be shared in a different direction of rotation, symmetric shape for the blade center height of the rotational axis It is formed so that it can be joined to the main plate 24 or the shroud 6 on either side of the both ends in the height direction, and the rotational direction is changed only by reversing the vertical relationship during the joining. The impellers of two types of blower fans can be formed at the same time.
[0021]
Therefore, the molds for forming the impeller 11 of two types of blower fans having different rotation directions are the same shape of the blades 26a, 26a..., 26b, 26b. There are only three simple structures, and the rotational direction is different at a very low cost compared to the case of manufacturing using two types of molding molds with a complicated structure in which the main plate and blades are integrated. It becomes possible to form the impeller 11 of two types of blower fans.
[0022]
(4) Invention of Claim 4 The manufacturing method of the ventilation fan of this invention is the structure of the said invention of Claim 3, The said blade | wing 26a, 26a ..., 26b, 26b ..., the main plate 14, or the shroud 6 Are provided with concavo-convex engaging portions 27, 28, 27, 28... That can be fitted and integrated with each other, and these concavo-convex engaging portions 27, 28, 27, 28. To be integrated.
[0023]
According to such a configuration, the concave and convex engaging portions 27, 28, 27, 28,... Are engaged, and then easily joined by a method such as finally ultrasonic welding as described later. It can be integrated.
[0024]
(5) Invention of Claim 5 The manufacturing method of the blower fan of this invention is the structure of the said invention of Claim 4, The uneven | corrugated engaging part 27,28,27,28 is ultrasonically welded after engagement. Thus, they are characterized by being integrated with each other.
[0025]
According to such a configuration, the concave and convex engaging portions 27, 28, 27, 28... Can be engaged with each other, and then ultrasonically welded to easily join and integrate them.
【The invention's effect】
[0026]
As a result, according to the structure of the blower fan of the present invention and the manufacturing method thereof, the number of complicated molding dies can be reduced, and two kinds of blower fans having different rotation directions can be provided at low cost. Become.
DETAILED DESCRIPTION OF THE INVENTION
[0027]
(Embodiment 1)
1 to 5 show, as an example, the structure of a blower fan according to Embodiment 1 of the present invention configured as a turbofan impeller for a ceiling-embedded air conditioner similar to the above-described conventional example and its manufacture. Shows how.
[0028]
(Blower fan structure)
First, FIG. 1 to FIG. 3 show a state before assembly of the turbofan impeller 11 installed in the ventilation path in the cassette-type main body casing of the ceiling-embedded air conditioner as shown in FIG. FIG. 4 shows the state after the subsequent assembly, and FIG. 5 shows the entire structure of the moving blade blade of the impeller 11.
[0029]
The turbo fan impeller 11 includes a boss portion 24a fixed to the rotational drive shaft of the fan motor at the center, and the boss portion 24a is high in the air intake direction on the shroud 6 side, and a flat portion having a predetermined width on the outer peripheral side. .., (See FIG. 1), 26b, 26b,... (See FIG. 2), which are different from each other, are joined to mutually different ends. A main plate (hub) 24 having an inverted outer peripheral edge portion 24b having a predetermined width and integrated, and a flat one side surface of the outer peripheral edge portion 24b of the main plate 24 according to the rotation direction. .., 26b, 26b... And a plurality of blades 26a, 26a..., 26b, 26b.・ ・ ・ Turbof on the opposite end of the main plate The center-side opening edge 6b that forms an air suction port in the centrifugal direction in the impeller 11 has a small diameter, and a funnel-shaped shroud 6 that gradually increases in diameter toward the outer peripheral edge 6a side. As shown in FIG. 4, each is integrally joined and fixed to each other.
[0030]
The main plate 24, the plurality of blade blades 26a, 26a,..., 26b, 26b,..., And the shroud 6 are formed by separately molding each of the individual molding dies with an ABS resin material, for example. As shown in FIGS. 1 and 2, they are formed separately from each other. In particular, the blade blades 26a, 26a,..., 26b, 26b,... Are symmetrically shaped in the same mold with respect to the blade center height in the rotation axis direction so that they can be shared in different rotation directions. Molded (described later).
[0031]
And the radial inner and outer end positions on the upper and lower ends of the plurality of blade blades 26a, 26a,..., 26b, 26b. As shown in FIG. 2, the projections 27, 27, 27, 27 for fitting are fitted into the respective opposing portions of the main plate 24 and the shroud 6 corresponding thereto. Recesses 28, 28, 28, 28 are provided respectively.
[0032]
And these convex part 27,27,27,27 and recessed part 28,28,28,28 are made into each of the said several blade blade 26a, 26a ..., 26b, 26b ..., for example, FIG. Or, as shown in comparison with FIG. 2, when the main plate 24 and the shroud 6 are fitted and integrated with their vertical relations reversed to each other, as a single unit molded with the same molding die, as shown in FIG. Two types of blade blades 26a, 26a,..., 26b, 26b,... Having the same shape but having blade angles suitable for different (reverse) rotational directions are installed. As a result, the two types of turbofan impellers 11 and 11 having different rotation directions shown in FIGS. 1 and 2 can be simply configured.
[0033]
Thus, according to the configuration of the blower fan impeller of this embodiment, each vane 26a, 26a · · ·, 26b, the 26b · · ·, so as to share in different rotational directions, the rotational axis formed into symmetrical shape about the blade center height, and configured to be joined with the main plate 24 or the shroud 6 on either side of both ends in the height direction, a vertical relationship at the junction The impellers of two types of blower fans having different rotation directions can be formed at the same time only by reversing them.
[0034]
Therefore, the molds for forming the impeller 11 of two types of blower fans having different rotation directions are the same shape of the blades 26a, 26a..., 26b, 26b. There are only three simple structures, and the rotational direction can be reduced at a very low cost compared to the case where the main plate and the blades are integrated with two types of molds with a complicated structure as in the past. It becomes possible to form the impeller 11 of two different types of blower fans.
[0035]
Further, in the blower fan impeller, in the above configuration, the joint portions of the blades 26a, 26a,..., 26b, 26b, and the main plate 14 or the shroud 6 can be fitted and integrated with each other. Concave and convex engaging portions 27, 28, 27, 28... Are provided, and these portions are integrated by ultrasonic welding.
[0036]
According to such a configuration, if the concave and convex engaging portions 27, 28, 27, 28... Are engaged with each other and finally ultrasonically welded as will be described later, they can be easily joined and integrated. Manufacturing efficiency can be increased. The shape and number of the concave and convex engaging portions are not limited to those shown in the drawings, and various modifications such as a longitudinal shape are possible.
[0037]
(Manufacturing method of blower fan)
The turbofan impeller 11 having the above configuration is manufactured, for example, as follows.
[0038]
(1) First step
A plurality of rotor vane blades 26a of the symmetrical about the blade center height of the rotation axis direction may be shared in different rotational directions, 26a · · ·, 26b, forming the shape of one class for molding 26b · · · Make a mold.
[0039]
(2) a second step the molding mold a plurality of rotor vane blades 26a using, 26a · · ·, 26b, respectively injection molded 26b · · ·.
[0040]
(3) Third step The main plate 24 and the shroud 6 are separately molded.
[0041]
(4) Fourth Step The blade blades 26a, 26a,..., 26b, 26b..., The main plate 24, and the shroud 6 respectively molded as described above are separately shown in FIGS. As described above, the rotor blades 26a, 26a,..., 26b, 26b,.
[0042]
(5) Fifth step From the state of FIG. 1 or FIG. 2, the convex portions 27, 27... 27, 27. at the upper and lower ends of the blade blades 26a, 26a. .. Are fitted into the corresponding recesses 28, 28..., 28, 28.
[0043]
(6) 6th process Finally, the said uneven | corrugated engaging part 27,28 ..., 27,28 ... is integrated reliably by welding with an ultrasonic wave.
[0044]
According to the manufacturing method of the blower fan impeller, the blades 26a, 26a · · ·, 26b, the 26b · · ·, as may be shared in a different direction of rotation, the blade center height of the rotational axis formed into symmetrical shape, only its either side end portions in the height direction configured to be joined with the main plate 24 or the shroud 6, the vertical relationship at the junction in opposite Impellers of two types of blower fans that have different rotation directions can be formed at the same time.
[0045]
Therefore, the molds for forming the impeller 11 of two types of blower fans having different rotation directions are the same shape of the blades 26a, 26a..., 26b, 26b. Compared to the case of manufacturing using two types of molding dies with a complicated structure with a main plate and blades integrated as in the past, there are only three with a simple structure. It becomes possible to form the impeller 11 of two types of blower fans.
[0046]
(Embodiment 2)
Next, FIGS. 6 and 7 show the configuration of an air conditioner blower fan (turbofan) impeller 11 similar to that of the first embodiment according to the second embodiment of the present invention.
[0047]
In this embodiment, in the configuration of the impeller 11 of the blower fan of the first embodiment, in particular, the inclined portion of the intermediate portion of the main plate 24 is extended by a predetermined width to the radially outer end side. The upper and lower ends (the leading edge side) on the radially inner end side (front edge side) of a plurality of blade blades 26a, 26a,..., 26b, 26b. The upper and lower ends 29, 30 after assembling as shown in FIG. 8 are tapered as shown in FIG. 7, and the main plate 24 is similarly extended in the direction of the taper in the central axis direction as shown in FIG. It is what.
[0048]
According to such a configuration, in addition to the same effects as those of the first embodiment, the blade lengths of the moving blade blades 26a, 26a,..., 26b, 26b. Since it can be sharpened, the air blowing performance can be further improved.
[0049]
(Other embodiments)
The blower fan in each of the above embodiments is not limited to the turbo fan, and can be applied to various centrifugal fans including a radial fan. Further, the molding material is not necessarily limited to the synthetic resin.
[Brief description of the drawings]
[0050]
FIG. 1 is a perspective view of a state before assembly showing a configuration example of a first type of a blower fan in a predetermined rotation direction according to Embodiment 1 of the present invention;
FIG. 2 is a perspective view of a state before assembly showing a configuration example of a second type whose rotation direction is different from that of the first type of the same fan.
FIG. 3 is a cross-sectional view showing a configuration of the blower fan before assembly.
FIG. 4 is a cross-sectional view in a state after assembly and integration (completed state) showing the configuration of the blower fan.
FIG. 5 is a perspective view showing a configuration of a single moving blade blade of the blower fan.
FIG. 6 is a cross-sectional view of the assembled and integrated state (completed state) showing the configuration of the blower fan according to Embodiment 2 of the present invention.
FIG. 7 is a perspective view showing a configuration of a single moving blade blade of the blower fan.
FIG. 8 is a cross-sectional view showing a configuration of a ceiling-mounted air conditioner having a blower fan.
FIG. 9 is a perspective view of a state before assembly showing a configuration example of a first type of a blower fan of the same air conditioner in a predetermined rotation direction.
10 is a perspective view of a state before assembly showing a configuration example of a second type in which the rotation direction is different from that of the first type shown in FIG. 9 of the blower fan. FIG.
[Explanation of symbols]
[0051]
6 is a shroud, 11 is an impeller of a blower fan, 24 is a main plate, 26a and 26b are blades having different rotational directions, 27 is a convex portion, and 28 is a concave portion.

Claims (5)

A main plate (14) to be rotated, a shroud (6) having an air suction port, and a plurality of blades (26a), (26a), provided between the main plate (14) and the shroud (6) ..., in (26b), (26b) blowing fan comprising a (11), each vane (26a), (26a), ..., (26b), a (26b).., different as can be shared in the direction of rotation, formed into a symmetrical shape about the blade center height of the rotation axis direction, the main board in either side of the both end portions of the height direction (24) or the shroud (6) The blower fan is characterized by being integrated with the air blower.   The joints of the blades (26a), (26a)..., (26b), (26b)... And the main plate (14) or the shroud (6) The blower fan according to claim 1, wherein joint portions (27, 28), (27, 28), ... are provided. A main plate (14) to be rotated, a shroud (6) having an air suction port, and a plurality of blades (26a), (26a), provided between the main plate (14) and the shroud (6) ..., upon producing a blowing fan comprising a (26b), (26b) ··· , firstly the respective blades (26a), (26a) ··· , (26b), the (26b) · · ·, differently can share in the direction of rotation, formed into a symmetrical shape about the blade center height of the rotation axis direction, then, one of the main plate on the side (24) or the shroud at both ends of its height direction (6) A method of manufacturing a blower fan, characterized in that it is integrally joined with the fan.   The joints of the blades (26a), (26a)..., (26b), (26b)... And the main plate (14) or the shroud (6) .. Are provided so as to be integrated by engaging the concave and convex engaging portions (27, 28), (27, 28). The method of manufacturing a blower fan according to claim 3.   5. The air blower according to claim 4, wherein the concave and convex engaging portions (27, 28) and (27, 28) are integrated with each other by ultrasonic welding after the engagement. Fan manufacturing method.

Images