JPS584199B2 - Propeller fan with disc ring - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a propeller fan, and relates to a propeller fan with a disc ring that blows air in a wide-angle conical shape (diagonally to the axial direction) without using a fixed wind tunnel or shield. .

Conventionally, the method of sending wind diagonally using a propeller fan was done by using a wind tunnel and forming a conical passageway in the wind tunnel, but the size of the wind tunnel was large and the loss caused by the wind tunnel was high. The large amount of noise caused the product to become larger and more expensive, as well as reducing air volume and increasing noise.

The present invention has been made in an attempt to eliminate the above-mentioned drawbacks.

That is, on the trailing edge of a plurality of blades forming a propeller fan,
A disc ring is provided concentrically with the rotating shaft so that the plurality of blades are connected to each other, the other front edge side is the main suction side, and the center part of the disc ring is a suction hole for auxiliary air flow opposite to the flow direction. Therefore, the action of the centrifugal fan is included, and the pressure difference in the radial direction is balanced with the pressure difference in the axial direction, and the flow is directed diagonally. Because the air flow sucked in from the center makes it less likely to come into contact with the disc link,
The air is blown out diagonally with low loss and efficiency.Furthermore, the air near the center of the blowout side flows into the blade side from the inner diameter side of the disc ring, which causes the air sucked in from the center to flow into the blade side. The flow is concentrated in the radial direction, resulting in a wider blowout angle.

The details of the present invention will be explained below with reference to FIGS. 1 and 2.

2 is the propeller fan, 3 is its boss, 4 is the blade, 4
a is a front edge (suction side), 4b is a rear edge (blowout side), 5 is a disc ring which is concentric with the rotating shaft and is provided on the rear edge 5b in accordance with the shape of the rear edge, 6 is a blowout side C and d are streamlines, e is a streamline sucked in from the back side of the disc ring 5, D is the outer diameter of the blade, E is the outer diameter of the disc ring, F indicates the inner diameter dimension of the disc ring 5.

Since the propeller fan 2 configured as described above has the disk ring 5 attached to the trailing edge 4b of the blade 4, it includes the action of a centrifugal fan, and the pressure difference in the radial direction is balanced with the pressure difference in the axial direction to control the flow. The orientation is diagonal.

In addition, in this case, the air C sucked in from the outer circumferential direction is lost because the flow of air d sucked in from the center is between the disk ring 5 and there is little contact with the disk ring 5. It is efficiently blown out diagonally with less amount of air.

Also, conveniently, since it is a disc ring, air near the center on the blowout side flows into the blade 4 side from the inner diameter F side of the disc ring 5, and due to this action, the flow of the above-mentioned d is radial. It is characteristic that it has the effect of a fluid element, as it is directed toward the direction side, and the air blows out at a wider angle.

In addition, even if the inner diameter of the disc ring 5 is large and some flow is blown out from the inner diameter side, it is good to be attracted from the middle by the flow on the outer circumferential side where the speed is higher and join, resulting in diagonal blowout. It is a point.

Next, regarding the appropriate dimensions and performance of the disc ring 5, which is the main part of the present invention, a cross-fin pipe type heat exchanger is arranged on the suction side, and a propeller fan with an outer diameter of 355φ is operated with a motor output of 15W and an applied voltage. Table 1 shows the actual measured values when operating at a constant speed of 600 rpm by adjusting the (change).

The larger the outer diameter E of the disc ring 5 is, the wider the blowing direction can be, but the air volume decreases, the noise increases, and the required power of the motor (shaft power, evaluated by the motor added voltage in Table 1) increases. do.

On the other hand, as the inner diameter F increases, the noise decreases, the air volume increases, and the required power for the motor decreases, but the blowing direction becomes narrower.

Even if the outer diameter E of the former disc ring 5 is increased to the outer diameter D of the blade, it is possible to blow out diagonally (E/F = 35 in Fig. 3).
5φ/180φ), and even if it is small, diagonal blowout is possible at a position of 0.6D or more where the blowout wind speed is high (see Figure 3 E/F=260φ/180φ, E=0.7
(See 3D).

If the inner diameter F of the latter disk ring 5 is larger than 0.85D, the amount blown out from the inner diameter F side will increase and the oblique blowing effect will be very small (Fig. 3 E/F = 355φ/30
0φ, F=0.8 5 E=0.8 5 D).

Also, considering the inner and outer diameter ratio F/E of the disc ring, the inner diameter F should be approximately 0.9E or less (Fig. 3 E/F = 300φ/2 60
φ, F=0.87E), it can be seen that a wide-angle conical blowing action can be effectively obtained.

That is, the appropriate positional dimensions of the disc ring 5 are in the range of 0.6D-D based on the blade outer diameter D, and the inner diameter F
is 0.85D or less with respect to the blade outer diameter D, and 0.9E or less with respect to the ring outer diameter E.

Regarding the disc ring of the present invention, when compared with a simple disc of the same outer diameter filled to the center (■ and ■ in Table 1 and Figure 3), the ring-shaped one can obtain 7% more air volume. It was confirmed that good performance was obtained, with the noise being 1 dB lower and the blowing angle being 5 degrees larger on one side and 10 degrees larger on both sides.

This is due to the effect of the fluid element mentioned above.

In order to obtain the same blowing angle as a disk ring with a simple disk, the diameter of the disk needs to be 8% larger, and in this case, the air volume is 8% larger.
．． 1% shortfall (comparison between ■ and 0 in Table 1 and Figure 3).

This is because if a simple disk is used, the configuration approaches a centrifugal fan, which is the same as not increasing wind pressure if there is no spiral casing, resulting in low efficiency operation.

In addition, when using a simple disk, the blowing angle becomes narrow because there is no opposite suction flow from the blowing side of the central part of the impeller as in the present invention, so the inflowing air from the suction side is closer to the outer circumference of the disk. This is because it is blown out.

In the present invention, as mentioned above, since the disk ring is used, the main flow from the suction side is blown out away from the outer circumference of the disk ring by the fluid element sucking in from the opposite side by the disk ring, so it has a wide angle. The blowing direction can be obtained.

In addition, while conventional centrifugal fans and cross-flow fans have a fixed radial blowout, and axial propeller fans have a fixed axial blowout, the present invention has It has the great advantage of being able to blow out obliquely at any blowing angle.

As for the structure, since it is only necessary to provide a disc ring on the blade, the propeller fan is simple and lightweight, and the vibration of the blade can be prevented, resulting in a sturdy propeller fan.

The product dimensions also allow you to obtain the desired blowing direction with the fan itself.
It is small and can be made at low cost.

Next, an embodiment in which the propeller fan with a disk ring of the present invention is applied to an outdoor unit for a room air conditioner will be described with reference to FIGS. 4 and 5.

7 is the unit body, 8 is the base, 9 is the heat exchanger housed inside, 10 is also the compressor, 11 is the partition plate that also serves as both a ventilation passage partition and compressor sound partition, 12 is the fan motor, 13 14 is a refrigerant transport pipe, and 12 is a fan motor 12.
A cylindrical boss for a fan that is large enough to store inside the fan, 1
Reference numeral 5 denotes a first protective grill for danger prevention, which is attached slightly apart from the propeller fan 2 and protrudes from the unit body 7.
The same numbers and symbols as those in the figures and FIG. 2 indicate the same items.

In the outdoor unit configured in this way, air is sucked in from the heat exchanger 9 side and becomes warm air, which is then sent to the propeller fan 2.
It is blown out from.

In this case, the circular ring 5 is attached to the propeller fan 2, and the H2 dimension of the blade thickness is opened toward the outer circumference, so that the hot air is efficiently directed to the desired purpose by the action of the fan itself, as described above. Not only does it provide a wide-angle diagonal blowout effect, but the wind speed is low at the front of the unit, so it can be operated even in narrow installation spaces without causing damage to objects or the human body, and with almost no deterioration in performance.

Further, even if the protective grille portion 15 is in direct contact with the wall surface, the air can be blown out toward the outer periphery, so there is a great advantage that normal operation can be performed in this case as well.

Regarding the structure, there is no need to provide a separate wind direction plate or the like, and since the propeller fan 2 is arranged to protrude from the unit body 7, the unit body 7 and base 8 can also be made smaller and lighter.

As explained above, according to the present invention, the disk ring 5 is provided concentrically with the rotating shaft so that the plurality of blades are connected and attached to the rear of the plurality of blades constituting the propeller fan,
The propeller fan with a disk ring is characterized in that the other front edge side is the main flow suction side, and the center of the disk ring 5 is the suction hole for the auxiliary air flow e opposite to the flow direction. It is possible to provide a wide-angle conical propeller fan that is easy to use, lightweight and strong, and has excellent performance, and can be used in a wide range of applications, such as preventing direct blowing of toxic gases, dust, hot air, etc.

[Brief explanation of drawings]

FIG. 1 is a front view of a propeller fan showing an embodiment of the present invention;
Fig. 2 is a side view of Fig. 2, Fig. 3 is a side view illustrating the effect of the blowing direction of the present invention, and Fig. 4 is a propeller fan with a disc ring of the present invention applied to an outdoor unit of a room air conditioner. A perspective view showing the embodiment, and FIG. 5 is a sectional view of FIG. 4. 2...Propeller fan, 3...Boss,
4... Blade, 4a... Leading edge, 4b
... Trailing edge, 5 ... Disc ring, 6-.
...Fan guide, D...Blade outer diameter,
E: Disc ring outer diameter, F: Disc ring inner diameter.

Claims (1)

[Claims] 1 A disc ring 5 is attached to the rear of a plurality of blades constituting a propeller fan so that the plurality of blades are connected and attached to each other.
is provided concentrically with the rotating shaft, the other front edge side is the main flow suction side, and the center part of the disc ring 5 is a suction hole for the auxiliary air flow e opposite to the flow direction. propeller fan.