JPH06249185A - Blower - Google Patents

Abstract

PURPOSE:To provide a blower capable of reliably preventing noise caused by surging of a cross flow fan. CONSTITUTION:In a blower wherein a cross flow fan 5 is arranged between a fan casing and a tongue part for forming a scroll, the clearance to be formed between the cross flow fan 5 and a suction end of the fan casing is so set that the clearance G1 of both side parts 14a, 14b in the longitudinal direction of the cross flow fan 5 may be narrower than the clearance G2 of a center part 14C. Thereby, pressure in the both side parts 14a, 14b of the cross flow fan 5 can be kept high, so that the pressure fluctuation is not easily generated, moreover noise caused by surging can be reliably prevented. Moreover, since the fan casing is not pressed by a decorative panel, the positional relationship to the cross flow fan 5 is not deviated by attaching of the decorative panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower device, and more particularly to a blower device having a cross flow fan.

[0002]

2. Description of the Related Art Generally, an air conditioner uses a blower for blowing air to a heat exchanger. As such a blower, a blower equipped with a cross flow fan is known ( See, for example, Japanese Patent Laid-Open No. 3-63429).

This type of blower generally has a fan casing forming a scroll around a cross flow fan and a tongue-shaped portion arranged at a position opposed to the fan casing. In this case, the distance from the cross flow fan is gradually narrowed toward the suction port side, and the distance is narrowest at the end.

On the other hand, a tongue-shaped portion is provided around the crossflow fan and close to the crossflow fan on the outlet side, and a constant distance is provided between the crossflow fan and the tongue-shaped portion. Holds the interval.

In such a conventional blower, noise has been a problem due to surging of the cross flow fan, and various means for preventing such noise have been proposed in the past. A resistor was provided on the side, and the shape and dimensions of the tongue were changed.

[0006]

However, since the tongue-shaped portion is usually attached detachably and may be displaced by being pushed by the decorative panel, the shape and shape of the tongue-shaped portion may be delicately changed. Even if the dimensions are changed, there is a problem that the position is displaced each time the decorative panel is attached or detached, and a sufficient effect cannot be obtained.

Further, the surging is caused by the pressure fluctuation of the air generated around the cross flow fan. However, especially on both sides of the cross flow fan, the pressure tends to be unstable and noise is likely to occur. There is.

Therefore, an object of the present invention is to provide an air blower capable of reliably preventing noise due to surging of a cross flow fan.

[0009]

In order to achieve the above object, the present invention provides an air blower in which a crossflow fan is arranged between a fan casing forming a scroll and a tongue-shaped portion. The space formed between the fan casings is set to be narrower on both sides in the longitudinal direction of the crossflow fan than on the central part thereof.

[0010]

[Function] Since the distance between the both sides of the cross flow fan is smaller than that of the central part compared to the central portion, the pressure on both sides of this cross flow fan is kept high, so that the pressure fluctuation is suppressed. Unlikely to occur.

Moreover, since the fan casing is not pushed by the decorative panel or the like, the positional relationship between the fan casing and the fan does not shift due to the attachment of the decorative panel or the like.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In this embodiment, a ceiling-embedded air conditioner (hereinafter referred to as "indoor unit") will be described as an example of a device equipped with the air blower according to the present invention.

The indoor unit 1 is of a general box type having a small thickness, and is a cassette type in which an upper portion A is embedded in a part of a ceiling in FIG. Inside the indoor unit 1, a substantially columnar cross-flow fan 5 for sending out air is provided, and on the upstream side of the cross-flow fan 5, a heat exchanger 3 provided in a substantially braided shape is provided. It is arranged. A fan casing 7 that forms a scroll from the lower side to the upper side is provided around the cross flow fan 5 on the outlet side of the cross flow fan 5.

The fan casing 7 is formed so as to curve upward from the blower outlet 11 side provided in the lower part, and the interval between the fan casing 7 and the cross flow fan 5 is gradually narrowed, and the suction side thereof. A fixed gap G is formed between the end portion 14 of 12 and the cross flow fan 5.

The gap G at the end 14 is determined by the distances shown in FIGS.
As shown in FIG. 6, the gap G ₁ (for example, 6.3 m) between the longitudinal side portions 14a and 14b of the cross flow fan 5 is set.
m) is a gap G ₂ (eg 7.0 m
m) is set narrower. By setting the gap G ₁ to be smaller than the gap G _{2 in} this manner, the cross flow fan 5
It is possible to increase the pressure in and to stably maintain the pressure in this portion. The distance G ₁ keeps this pressure stable up to about 6.0 mm to reduce noise, but if the distance G ₁ is less than 6.0 mm, the pressure becomes too high, which may increase noise. Since there is a gap G
_The limit for ₁ is 6.0 mm.

A gap L is also set between the tongue-shaped portion 15 located below the crossflow fan 5 and the crossflow fan 5. The tongue-shaped portion 15 has a substantially cylindrical shape. The cross flow fan 5 is provided along the longitudinal direction of the cross flow fan 5, and the gap L between the cross flow fan 5 and the cross flow fan 5 gradually widens toward the outlet 11.

In this embodiment, in order to strictly set and maintain the gap L between the tongue portion 15 and the cross flow fan 5, the bearing portions (not shown) at both ends of the cross flow fan 5 are made of resin. A guide part 23 formed integrally is provided.

On the other hand, below the heat exchanger 3, a sub-drain pan 17 is provided and a plurality of receivers 19 are provided.
A drain pan 21 is provided at the lower end of the heat exchanger 3, and the drain pan 21 receives the drain from the heat exchanger 3.

A decorative panel 13 having a suction port 9 and an outlet 11 is provided on the lower surface of the indoor unit 1. The outlet 11 of the decorative panel 13 has vertical blades for changing the wind direction. 25 and horizontal blades 27 are provided, and a filter 29 is provided at the suction port 9 of the decorative panel 13.

Next, the operation of this embodiment will be described.

When the air blower is driven during operation of the air conditioner, the crossflow fan 5 rotates in the direction of arrow S,
The air on the suction side 12 is taken in and blown to the air outlet 11 side. As a result, air is taken in through the inlet 9, passes through the heat exchanger 3, and the heat-exchanged air is blown from the outlet 11 via the crossflow fan 5.

In the cross flow fan 5, both side portions 1
4a and 14b are formed to have a smaller distance from the proximal end portion of the fan casing 7 than the central portion 14c, so that the pressure on both sides of the crossflow fan 5 is kept high and pressure fluctuations occur. It is difficult and noise due to surging can be prevented.

Furthermore, according to the present embodiment, pressure fluctuations are less likely to occur around the cross flow fan 5, so that not only noise can be reduced, but also outflow of blown air can be stabilized.

Moreover, in this embodiment, since the casing 7 is not pressed by the decorative panel 13 or the like, the gap G between the end portion 14 of the casing 7 and the cross flow fan 5 is set.
However, it does not change when the decorative panel is attached or removed. Therefore, noise due to surging of the cross flow fan 5 can be reliably prevented.

Next, the result of the experiment of this embodiment will be described.

In the above embodiment, the cross flow fan 5 having a length M in the longitudinal direction of 500 to 700 mm is used, and the blades are divided into 10 sections in the longitudinal direction. Both sides 14a, 14b
In the above, the distance G ₂ on both sides corresponding to the length M1 for one division (about 50 to 70 mm) is 7.0 mm, and the distance G at the center is G.
₁ was set to 6.3 mm.

Under such conditions, the noise when the indoor unit 1 was operated was measured, and a comparative experiment was conducted with a conventional one in which the distance G ₂ between both side portions 14a and 14b was set to be the same as the distance G ₁ between the central portions 14c. did.

As a result, in this embodiment, 500 to 60
Noise generated intermittently at the frequency of 0 Hz is lower than that of the conventional one, and the so-called A characteristic (B characteristic, C characteristic) is generated.
It has been confirmed that the characteristics are the closest to those of the human ear), and the characteristics are about 0.5 dB lower than the conventional one.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified without departing from the gist of the present invention.

Further, although the above embodiment has been described by taking the air blower used for the indoor unit of the air conditioner as an example, the present invention is not limited to this and may be used for other air blowers such as a ventilation fan.

[0032]

According to the blower of the present invention, the longitudinal sides of the crossflow fan are set narrower than the central portion thereof in the space formed between the crossflow fan and the fan casing. Therefore, since the pressures on both sides of the cross flow fan are maintained high, pressure fluctuation is unlikely to occur and noise due to surging can be reliably prevented.

Moreover, since the fan casing is not close to the front panel, the distance between the crossflow fan and the fan casing does not shift when the front panel or the like is attached or detached.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an air conditioner incorporating the blower of the present invention.

FIG. 2 is a front view showing a gap between a cross flow fan shown in FIG. 1 and a casing.

FIG. 3 is a cross-sectional view showing a gap between a cross flow fan shown in FIG. 2 and a casing.

[Explanation of symbols]

1 indoor unit 3 heat exchanger 5 the cross flow fan 7 casing 14a side portions 14b both side portions 14c central portion 15 interval interval G ₂ the central portion of the tongue G ₁ side

Claims (1)

[Claims] 1. In an air blower in which a crossflow fan is arranged between a fan casing forming a scroll and a tongue-shaped part, the space formed between the crossflow fan and the fan casing is set to An air blower characterized in that both side portions in the longitudinal direction are set to be narrower than the central portion.