JPH06307390A - Turbo fan and manufacture thereof - Google Patents

Abstract

PURPOSE:To increase the degree of freedom of the shape of each blade while reducing the cost without increasing the weight and size of a turbo fan. CONSTITUTION:A turbo fan 15 consists of a hub 16 made of aluminum and a shroud 18 made of aluminum, and blades 19 made of resin, and combination of these components allows easy formation of a three-dimensional or complicated shape with different thickness of the blades, and increases the degree of freedom of the shape of the blades 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbofan and a method for manufacturing the turbofan.

[0002]

2. Description of the Related Art Conventionally, a turbo fan of this type has been known as a kind of centrifugal fan used for an air conditioner as disclosed in, for example, Japanese Utility Model Laid-Open No. 64-41696, and is With a plurality of blades (blades) radially arranged with a hub circumferentially spaced between the hub, which is integrally attached to the rotary shaft so as to rotate integrally, and a shroud arranged concentrically with the hub on the side of the hub. It is one united. However, in this conventional device, the hub, shroud and each blade are all made of a metal material such as aluminum, which is disadvantageous in terms of cost and the like.

On the other hand, conventionally, it is also known that the hub, shroud and blades of the turbofan are all integrally molded with a resin material, which leads to cost reduction as compared with the case of using a metal material as described above. Can be achieved.

[0004]

By the way, from the viewpoint of improving the blowing performance of the turbofan, each blade has a three-dimensionally changed shape, and each end portion of the blade on the hub side and the shroud side is more than the intermediate portion. There is a demand for thickening, and for that purpose, it is necessary to increase the degree of freedom of each blade shape.

However, when the hub, shroud and blades are all integrally molded with a resin material as in the prior art, it is impossible to die-cut blades having different three-dimensional shapes and different wall thicknesses, and the above requirements must be met. Was difficult.

Further, it is considered that the hub, the shroud, and the blades are divided and molded, and then they are integrally assembled, but the thickness of the hub and the shroud made of resin must be increased in order to secure the strength. Therefore, the turbo fan will increase in weight and size.

The present invention has been made in view of the above points, and its main purpose is to reduce the cost without increasing the weight and size of the turbofan by properly combining the constituent materials. While aiming for
It is to be able to increase the degree of freedom of each blade shape.

[0008]

In order to achieve the above object, in the invention of claim 1, the hub and the shroud are made of aluminum, and the blades are made of resin which is easy to form in a complicated manner.

That is, according to the present invention, as shown in FIGS. 1 and 2, a hub (16) made of aluminum which is attached to a rotary shaft (7) of a motor or the like so as to rotate integrally with the rotary shaft (7) and a side portion of the hub (16). Aluminum shrouds (18) arranged concentrically with each other and radially arranged with a circumferential interval between the hub (16) and the shroud (18), and both ends (19a) of each. , (19b) are integrally fixed to the hub (16) and the shroud (18), respectively, to form a plurality of resin blades (19), (19), ...
It has and.

According to the second aspect of the invention, as shown in FIG.
Each blade (19) is assumed to be smoothly twisted with respect to a plane passing through the center of the hub (16) between the hub side end (19a) and the shroud side end (19b).

According to the third aspect of the invention, as shown in FIG.
In each blade (19), the thickness of the hub-side and shroud-side end portions (19a) and (19b) is set to be larger than that of the middle portion.

As a method of manufacturing the turbofan according to claim 1, in the invention of claim 4, as shown in FIGS. 1, 5 and 6, the end portions of the blades (19) on the hub side and the shroud side ( 19a) and (19b) are provided with protrusions (2
0) and (21), while the protrusions (20) and (21) of the blades (19) are inserted into the blade mounting positions of the hub (16) and the shroud (18). , (23) are formed in advance, and each blade (1
After inserting the protrusions (20) and (21) of 9) into the insertion holes (22) and (23) of the hub (16) and the shroud (18), respectively, the insertion holes (22) and (23) are inserted. Then, the blades (19) are attached to the hub (16) and the shroud (18) by thermally processing the tips of the protrusions (20) and (21) located on the back side of the hub (16) and the shroud (18). ) Fixed to immovable.

On the other hand, in the invention of claim 5, as shown in FIG. 8, screw insertion holes (24), (25) are formed at the blade mounting positions of the hub (16) and the shroud (18), respectively. After the blade (19) is positioned at the blade mounting position of the hub (16) and the shroud (18), screws (26) and (26) are inserted from the rear side of the hub (16) and the shroud (18) into the screw insertion hole. (24), (2
5) and insert the ends (19) of each blade (19).
The blades (19) are immovably fixed to the hub (16) and the shroud (18) by being screwed and fastened to a) and (19b).

[0014]

With the above construction, in the invention of claim 1, the turbofan has a hub (16) and a shroud (18) made of aluminum and blades (19), (19), ... Made of resin.
Since the blades (19) are divided into (1) and (2), a turbo fan can be obtained by integrally assembling the blades (19) with the hub (16) and the shroud (18). At this time, since each blade (19) is made of resin, even if the shape is a three-dimensional shape or a complicated shape with different wall thickness, it can be easily formed and the processing can be performed easily. The degree of freedom of the shape of the blade (19) can be increased.

Also, the hub (16) and the shroud (1
Since 8) is made of aluminum, which is stronger than resin, its thickness can be made thinner than that of resin, and accordingly, the weight of the turbofan can be reduced and the size can be made compact.

According to the second aspect of the present invention, each of the blades (19), (19), ... In the turbofan has a hub (16) between its hub side end (19a) and shroud side end (19b). Since it is twisted smoothly with respect to a plane passing through the center of (1), a three-dimensional blade (19) can be easily obtained.

In the invention of claim 3, each blade (19)
Hub side and shroud side ends (19a), (19b)
Since the thickness of the blade is larger than that of the middle portion, a blade (19) having a variable wall thickness can be easily obtained.

According to the invention of claim 4, when the turbofan of claim 1 is manufactured, the insertion holes (22), (23) formed in advance at the blade mounting positions of the hub (16) and the shroud (18). After inserting the projections (20) and (21) protruding from the hub-side and shroud-side ends (19a) and (19b) of the blades (19) into the hub (16) and By heat-processing the tips of the protrusions (20) and (21) located on the back side of the shroud (18), the blades (19) can be attached to the hub (16).
And fixed immovably to the shroud (18).
On the other hand, in the invention of claim 5, when manufacturing a turbofan, after positioning each blade (19) at the blade mounting position of the hub (16) and the shroud (18), the hub (16) and the shroud (18) are positioned. Screws (26) and (26) are inserted from the back side of the blades into screw insertion holes (24) and (25) formed in advance in the blade mounting positions of the hub (16) and the shroud (18), and each blade ( 1
The blades (19) are immovably fixed to the hub (16) and the shroud (18) by being screwed and fastened to the ends (19a) and (19b) of 9). Therefore, in these inventions, the turbofan having the above configuration can be easily manufactured.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a case where a turbofan according to an embodiment of the present invention is used as a ceiling-embedded air conditioner (A), and (1) is a rectangular box-shaped casing that is embedded in an indoor ceiling. (1) is opened downward, and this opening has a suction port (2) in the center and a plurality of outlets (3), (3), ... ) Is covered. An air passage (4) is formed inside the casing (1) to connect the suction port (2) to each of the air outlets (3), and an indoor heat exchanger is provided in the middle of the air passage (4). (5) is arranged annularly. A motor (6) located in the heat exchanger (5) is attached to the upper wall of the casing (1) with its rotation shaft (7) projecting downward, and the rotation shaft of this motor (6). A turbofan (15) that pushes air sucked from below to the outside in the radial direction is integrally attached to (7), and the turbofan (15) is rotated by the drive of a motor (6), thereby Air is sucked into the air flow path (4) from the suction port (2) of the casing (1) and supplied to the heat exchanger (5), where it is cooled or heated by heat exchange, and then each blowout port (3). Is blown out from the casing (1).

Reference numeral (8) is a bellmouth-shaped suction shroud which is arranged below the turbofan (15) and is formed so that its diameter becomes smaller toward the upper side.
The air sucked from the air is guided toward the turbo fan (15) while being converged. Further, (10) is an auxiliary heater arranged between the turbo fan (15) and the heat exchanger (5).

The turbofan (15) has a center portion recessed below the peripheral portion and the rotary shaft of the motor (6) at the center of the recessed portion, as shown in detail in FIGS. 1 and 2. A hub (16) made of aluminum, which is attached to (7) in a rotationally integrated manner, is concentrically arranged below the hub (16), and has a center portion having a shape substantially the same as that of the hub (16) below the peripheral portion. And the central hole (1
7), and the center hole (17) is provided with a bellmouth-shaped aluminum shroud (18) concentrically arranged around the suction shroud (8) with a constant gap. A plurality of (10 in the figure) resin blades (19), (19), ... Are circumferentially provided between the hub (16) and the shroud (18) at unequal intervals, and The inner peripheral edge portion is radially arranged in the form of a so-called backward tilted blade located on the front side in the rotation direction of the turbofan (15) with respect to the outer peripheral edge portion. Then, the hub-side and shroud-side end portions (19a) of each blade (19),
(19b) are the hub (16) and the shroud (1), respectively.
8), the hub side and shroud side ends (19
Projections (20) and (21) projecting from a) and (19b)
Are integrally joined by heat processing. The shroud (18) is integrally connected and fixed to the hub (16) through the plurality of blades (19), (19), ....

That is, a method of manufacturing the turbo fan (15) will be described. As shown in FIGS. 6 and 7, a plurality of hub side protrusions (20) are provided at the hub side end (19a) of each blade (19). , (20), ... And a plurality of shroud-side protrusions (2) at the shroud-side end (19b).
1), (21), ... Are respectively formed. On the other hand, at the blade mounting position where each blade (19) is mounted on the hub (16), an insertion hole (22) through which the hub side protrusions (20), (20), ... Of each blade (19) are inserted. , (22), etc., and similar blade mounting positions in the shroud (18), each blade (1
Insertion holes (23), (23), ... Through which the shroud-side protrusions (21), (21), ... Then, as shown in FIG. 5, each blade (19)
Hub side protrusions (20), (20), ... of the hub (16)
Of the shroud-side projections (21), (21), ... to the insertion holes (23), (23) ,. The hub (16) and the shroud (18) are inserted so as to project to the back side, and then, as shown in FIG. 1, the hub (16) and the shroud are inserted through the insertion holes (22) and (23). Protrusions (20), (2 located on the back side of (18)
Each blade (19) is transformed into a hub (16) and a shroud (18) by deforming the tip portion of 1) by heat processing.
It is fixed so that it cannot move.

Further, as shown in FIG. 4, the blades (19) have different shapes at the hub side end (19a) and the shroud side end (19b), and the outer peripheral side of the hub side end (19a) is different. It is located on the front side in the fan rotation direction with respect to the outer peripheral side of the shroud side end (19b), and the inner peripheral side of the hub side end (19a) is rearward with respect to the inner peripheral side of the shroud side end (19b) in the fan rotation direction. Hub side end (19a) so that it is located
And the shroud side end (19b) are twisted smoothly with respect to a plane passing through the center of the hub (16).

Therefore, in the above embodiment, the turbo fan (15) in the air conditioner (A) has a hub (16) and a shroud (18), and a plurality of blades (1).
9), (19), ..., By dividing each blade (19) between the hub (16) and the shroud (18), the turbofan (15) is integrally connected and fixed. Is obtained.

At this time, since each blade (19) is made of resin, its shape is in a plane passing through the center of the hub (16) between the hub side end (19a) and the shroud side end (19b). On the other hand, the blade (19) can be easily formed even with a complicated three-dimensional shape that is smoothly twisted, and the degree of freedom of the shape can be increased to improve the performance of the turbofan (15). At the same time, the blade (19) can be easily processed.

Moreover, the hub (16) and the shroud (1
Since 8) is made of aluminum, which is stronger than resin, its thickness can be made smaller than that of resin, and the weight of the turbofan (15) can be reduced and the size can be made compact. it can.

In the above embodiment, each blade (19)
Hub (16) by heat-processing the protrusions (20), (21) of the
And the shroud (18),
Other fixing methods can also be adopted. For example, in FIG.
Shows an example thereof, and in this method, screw insertion holes (24), (24), ... Are previously provided at the blade mounting positions of the hub (16).
, And screw insertion holes (25), (25), ... Are formed at the blade mounting positions of the shroud (18). Then, after positioning each blade (19) at the blade mounting position of the hub (16) and the shroud (18), screws (26) and (26) are respectively attached from the back side of the hub (16) and the shroud (18). The blades (19) are inserted into the screw insertion holes (24) and (25) and screwed and fastened to the end portions (19a) and (19b) of the blades (19), so that the blades (19) are connected to the hub (16) and the shroud. It may be fixed immovably with respect to (18).

In the above embodiment, each blade (1
Although the thickness of 9) is constant from the hub side end (19a) to the shroud side end (19b), as shown in FIG.
Hub-side and shroud-side ends (1) of each blade (19)
The thickness of 9a) and (19b) may be thicker than the middle portion. In this case, the blade (1) whose wall thickness changes between the hub side end (19a) and the shroud side end (19b).
9) can be easily obtained, which can contribute to improvement of the performance of the turbo fan (15). Further, in the above embodiment,
This is the case of a turbo fan in which the intervals of the blades (19), (19), ... Are set to unequal pitch, but it goes without saying that the present invention can be applied to a turbo fan having blades of equal pitch. Is.

Further, in the above embodiment, the air conditioner (A) is used.
In the case of the turbo fan (15) used for the above, it goes without saying that the present invention can be applied to the turbo fan used for other devices.

[0030]

As described above, according to the invention of claim 1, the turbofan is divided into a hub and shroud made of aluminum and a blade made of resin, and these are formed in combination. With the resin blade, even if the shape is a three-dimensional shape or a complicated shape with different wall thickness, it can be easily molded to increase the degree of freedom of the shape of the blade, and in turn, the performance of the turbofan. The thickness of the hub and shroud can be made thinner than that of resin, and the turbofan can be made lighter and more compact.

According to the invention of claim 2, each blade comprises:
A blade having a three-dimensional shape can be easily obtained by twisting smoothly between the hub-side end and the shroud-side end with respect to a plane passing through the center of the hub.

According to the invention of claim 3, each blade comprises:
Since the thickness of the hub-side and shroud-side ends is made larger than that of the middle part, a blade having a variable wall thickness can be easily obtained.

According to a fourth aspect of the present invention, as a method of manufacturing the turbofan, protrusions are formed in advance on the hub-side and shroud-side ends of each blade, and the blades are attached to the hub and shroud. After forming an insertion hole through which the protrusion of the blade is inserted and inserting the protrusion of each blade into the insertion hole of the hub and shroud, heat the tip of the protrusion located on the back side of the hub and shroud. After processing, each blade was fixed so as to be immovable with respect to the hub and shroud. In addition, claim 5
In the invention, the screw insertion holes are formed in advance at the blade mounting positions of the hub and the shroud, the blades are positioned at the blade mounting positions of the hub and the shroud, and then the screws are screwed into the screw insertion holes from the rear side of the hub and the shroud. The blades are inserted and screwed and fastened to the end portions of the blades, so that the blades are immovably fixed to the hub and the shroud.
Therefore, in these inventions, the turbofan can be easily manufactured.

[Brief description of drawings]

1 is an enlarged cross-sectional view taken along the line II of FIG.

FIG. 2 is a plan view of a turbofan according to an embodiment of the present invention as viewed from below.

FIG. 3 is a vertical cross-sectional view of a ceiling-embedded air conditioner.

FIG. 4 is a plan view showing a change in shape of each blade in the turbo fan.

FIG. 5 is a cross-sectional view showing a state in which the turbo fan is being manufactured.

FIG. 6 is a front view of a blade.

FIG. 7 is a perspective view of a blade.

FIG. 8 is a view corresponding to FIG. 5, showing a modified example of the method for manufacturing the turbo fan.

FIG. 9 is a side view showing a modified example of the blade.

[Explanation of symbols]

 (A) Air conditioner (6) Motor (7) Rotating shaft (15) Turbo fan (16) Hub (18) Shroud (19) Blade (19a) Hub side end (19b) Shroud side end (20), (21) Projection (22), (23) Insertion hole (24), (25) Screw insertion hole (26) Screw

Claims (5)

[Claims] 1. A hub (16) made of aluminum, which is attached to a rotary shaft (7) so as to rotate integrally, a shroud (18) made of aluminum which is concentrically arranged on the side of the hub (16), and the hub. (16) and shroud (18) are radially arranged with a space in the circumferential direction, and both end portions (19a), (19b) are integrated with hub (16) and shroud (18), respectively. A turbo fan comprising a plurality of resin blades (19), (19), ... 2. The turbofan according to claim 1, wherein each blade (19) lies in a plane passing through the center of the hub (16) between the hub-side end (19a) and the shroud-side end (19b). A turbo fan characterized by being smoothly twisted. 3. The turbofan according to claim 1 or 2, wherein each blade (19) has a hub-side and shroud-side end (19a), (19b) thicker than an intermediate portion. Is a turbo fan. 4. The method of manufacturing a turbofan according to claim 1, wherein the blade (19) has a protrusion (20) at the hub-side and shroud-side ends (19a), (19b), respectively.
(21) while forming the blades (19) at the blade mounting positions of the hub (16) and the shroud (18).
Insertion holes (2) through which the protrusions (20) and (21) of the
2) and (23) are formed in advance, and the protrusions (20) and (21) of each blade (19) are inserted into the insertion holes (22) of the hub (16) and shroud (18).
After being inserted into the (23) respectively, the insertion holes (22),
The hub (16) and the shroud (1) are inserted through the (23).
Fixing each blade (19) immovably with respect to the hub (16) and shroud (18) by thermally processing the tips of the protrusions (20) and (21) located on the back side of 8). A method for manufacturing a turbofan, characterized by: 5. The method for manufacturing a turbo fan according to claim 1, wherein screw insertion holes (24), (25) are formed at blade mounting positions of the hub (16) and the shroud (18), Replace each blade (19) with hub (16) and shroud (1
After the blade is positioned at the blade mounting position of 8), screws (2) are attached from the rear side of the hub (16) and the shroud (18).
6) and (26) are inserted through the screw insertion holes (24) and (25), and the end portions (19a) and (1) of each blade (19) are inserted.
9b) by screwing and fastening each blade (19)
Is fixed to the hub (16) and the shroud (18) so as not to move. A method for manufacturing a turbofan, comprising: