JP2001090689A - Fan mechanism and air conditioner with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fan mechanism capable of lowering the generation of noises and improved in the air blowing performance, and to provide an air conditioner provided with this fan mechanism. SOLUTION: A vortex stabilizing member 20 is extended from a winding start part S of a back scroll 10 in an opposite direction to the rotor rotating direction. A vortex stabilizing pocket 23 for gradually increasing a clearance between the inner surface of the vortex stabilizing member 20 and the outer peripheral surface of a fan rotor 9 is formed in the opposite direction to the rotor rotating direction. With this structure, the center of eddy at a back side can be positioned in the downstream of the winding start part S of the back scroll 10 outside of the fan rotor 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan mechanism and an air-conditioning indoor unit having the fan mechanism. More specifically, the present invention relates to a cross-flow fan type fan mechanism for reducing blowing noise and improving blowing performance. The present invention relates to an air-conditioning indoor unit having a fan mechanism and a fan mechanism.

[0002]

2. Description of the Related Art First, FIG.
Based on the above, the internal structure of a conventional air conditioner indoor unit will be described. As shown in the figure, the indoor unit casing 1 of the indoor unit
Indoor heat exchanger 4, fan rotor 9, electrical component unit 14
Body casing 1a to which the main components such as
And a front grille 5 attached to the front of the main casing 1a, and a front panel 7 attached to the front of the front grill 5 further. In the indoor unit casing 1, a plate-fin type indoor heat exchanger 4 configured by arranging a front heat exchanger 2 and a rear heat exchanger 3 in an inverted V-shape is arranged. As shown in FIG. 4, the indoor unit casing 1 has a top surface suction port 6 formed in a ceiling portion of a front grille 5 and a front panel 7 with a front surface suction port 8.
Are formed. Among them, the top surface suction port 6 is formed by forming a ceiling portion of the front grille 5 in a lattice shape, and the front surface suction port 8 is provided at a slightly upper portion of the center of the front panel 7.
It is formed by extending an opening facing upward in the lateral direction.

[0003] A fan rotor 9 is disposed inside the inverted V-shape of the indoor heat exchanger 4. This fan mechanism is a cross flow fan (lateral flow fan) type, and is arranged so that the axial direction of the fan rotor 9 is along the longitudinal direction of the indoor unit casing 1. A back scroll 10 is formed behind the fan rotor 9, and is smoothly connected to an air outlet 11 opening at a lower portion on the front side of the indoor unit casing 1. The front casing 12 of the outlet 11
Is a drain pan 1 located under the front heat exchanger 2.
3 and at a position above the outlet 11 on the front side of the drain pan 13, that is, at a position between the drain pan 13 and the front panel 7.
An electrical component unit 14 is provided. In addition, a rear drain pan 15 is disposed below the rear heat exchanger 3.

The structure of the main casing 1a will be further described. The rear drain pan 15 and the back scroll 10 are integrally formed. The back scroll 10 has a winding start portion S closest to the outer peripheral portion of the fan rotor 9 as a start end, and extends downwardly in the figure in a curved manner.
And a portion slightly lower than that also serves as a part of the side wall of the rear drain pan 15. A rear drain pan side wall 21 extends obliquely upward from the winding start portion S of the back scroll 10.

In the above-described cross-flow fan type fan mechanism, a large eccentric vortex is formed at a position close to the front casing 12 inside the fan rotor 9 due to the interaction between the tongue of the front casing 12 and the fan rotor 9. Occurs. By the action of the eccentric vortex, an air flow is generated in a plane perpendicular to the axis of the fan rotor 9. That is, the air sucked in from the suction ports 6 and 8 flows in from the suction side of the outer peripheral portion of the fan rotor 9 as a part of the flow of the eccentric vortex, and passes through the inside of the fan rotor 9 again. 9 from the outlet side and outlet 1
One is blown out.

[0006]

With respect to the above-mentioned conventional fan mechanism, how the air flow is formed in order to reduce the amount of noise generated or to improve the blowing performance was examined in detail. . As a result, as shown in FIG. 6, it was confirmed that a back-side vortex different from the eccentric vortex was generated inside the fan rotor 9 at the winding start portion S of the back scroll 10. Due to the generation of the vortex, the air flow along the back scroll 10 is disturbed near the winding start portion of the back scroll 10, and as a result, noise is generated (particularly, NZ sound is generated), and the blowing performance is reduced. It is considered that an inconvenient phenomenon has occurred.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the present invention is to provide a fan mechanism capable of reducing a noise generation amount and improving a blowing performance. is there. Also, the amount of noise generated,
It is also an object of the present invention to provide an air-conditioning indoor unit having a fan mechanism with improved ventilation performance.

Therefore, the fan mechanism according to the first aspect comprises a fan rotor 9, a front casing 12, and a back scroll 10.
In the cross-flow fan type fan mechanism having the above structure, the backside vortex center is located outside the fan rotor 9 in the vicinity of the winding start portion S of the backside scroll 10.

The fan mechanism according to the first aspect is characterized in that the center of the vortex on the back side is located outside the fan rotor 9. By doing so, the winding start portion S of the back scroll 10 is formed. The turbulence of the air flow in the vicinity is suppressed, and the flow along the back scroll 10 becomes smooth (see FIG. 1). As a result, it is possible to reduce the noise generation amount and improve the blowing performance.

According to a second aspect of the present invention, the fan mechanism includes a vortex stabilizing member 20 extending from the winding start portion S of the back scroll 10 in a direction opposite to the rotor rotation direction. A vortex stabilizing pocket 23 is formed between the inner surface of the forming member 20 and the outer peripheral surface of the fan rotor 9 in such a manner that the distance between them gradually increases in the direction opposite to the rotor rotation direction. Is characterized in that the center of the vortex on the back side is positioned upstream of the winding start portion S of the back scroll 10.

According to the fan mechanism of the second aspect, the turbulence of the air flow in the vicinity of the winding start portion S of the back scroll 10 can be suppressed with a simple configuration, and the amount of noise generated can be reduced.
In addition, it is possible to improve the blowing performance.

According to a third aspect of the present invention, the distance between the inner surface of the tip of the vortex stabilizing member 20 and the outer peripheral surface of the fan rotor 9 is determined by the distance between the back scroll 10 and the fan rotor at the winding start portion S of the back scroll 10. 9 is three times or more and six times or less the distance from the outer peripheral surface of the substrate 9.

The distance between the inner surface of the tip end of the vortex stabilizing member 20 and the outer peripheral surface of the fan rotor 9 is determined by the distance between the outer peripheral surface of the back scroll 10 and the outer peripheral surface of the fan rotor 9 at the winding start portion S of the back scroll 10. 3 times or more, preferably,
If it is four times or more, the center of the vortex on the back side can be held in a more stable state outside the fan rotor 9. On the other hand, the distance between the inner surface of the tip portion of the vortex stabilizing member 20 and the outer peripheral surface of the fan rotor 9 is 6 times the distance between the outer surface of the back scroll 10 and the outer peripheral surface of the fan rotor 9 at the winding start portion S of the back scroll 10. When it is larger than double,
In addition to not being able to further improve the effect of stabilizing the vortex position, the ventilation resistance is increased and the ventilation performance is reduced. Therefore, if the distance between the inner surface of the tip end portion of the vortex stabilizing member 20 and the outer peripheral surface of the fan rotor 9 is within the above range, the ventilation position is not reduced and the vortex position is stabilized. The advantages of reducing the amount of noise generation and improving the blowing performance can be obtained.

A fan mechanism according to a fourth aspect of the present invention is characterized in that the inner surface of the vortex stabilizing member 20 is formed in the middle thereof so as to project radially outward of the fan rotor 9.

According to the fan mechanism of the fourth aspect, the position at which the vortex is generated can be further stabilized, and therefore, the advantages of reducing the amount of noise generated due to the stabilization of the vortex position and improving the blowing performance can be obtained.

The fan mechanism according to any one of claims 1 to 4 is
If the invention is applied to an air-conditioning indoor unit as described in claim 5, it is possible to improve the use comfort by reducing the noise generation amount and improving the blowing performance.

In the air conditioner indoor unit of the present invention, a front heat exchanger 2 and a rear heat exchanger 3 are arranged in an indoor unit casing 1,
In an air-conditioning indoor unit in which a rear drain pan 15 is arranged below the rear heat exchanger 3, any one of the above-described claims 2 to 4 is provided between the front heat exchanger 2 and the rear heat exchanger 3. And the vortex stabilizing member 20 and the rear drain pan side wall 21 are integrated.

According to the air conditioner indoor unit of the sixth aspect, since the vortex stabilizing member 20 and the rear drain pan side wall 21 are integrated, the operation can be performed without increasing the cost.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of a fan mechanism and an air-conditioning indoor unit having the fan mechanism according to the present invention will be described in detail with reference to the drawings. The specific overall structure of the air conditioner indoor unit in each of the following embodiments is the same as that described above with reference to FIG.

(First Embodiment) FIG. 1 shows a characteristic structure of this embodiment. As described above, in the figure, 3 is a rear heat exchanger, 9 is a fan rotor of a cross flow fan, and 10 is a back scroll. The back scroll 10 is also called a rear casing and has a smoothly curved cross-sectional shape (see FIG. 1). In a portion indicated by a point S in FIG. 1, it is closest to the outer peripheral portion of the fan rotor 9 (the interval is about 4
mm), this point S is the winding start portion. A vortex stabilizing member 20 extends from the winding start portion S in a direction opposite to the rotation direction of the fan rotor 9 so as to be gradually separated from the outer peripheral portion of the fan rotor 9. The vortex stabilizing member 20 includes a back drain side wall 21 provided also in the conventional example, and an auxiliary member 22 attached to the back side of the back drain side wall 21 (the surface opposite to the fan rotor 9). Consisting of: The inner surface of the vortex stabilizing member 20 faces the fan rotor 9, and a vortex stabilizing pocket 23 is formed between the inner surface and the outer surface of the fan rotor 9 (the outer surface of the rotation trajectory). . This vortex stabilization pocket 2
Numeral 3 has a substantially triangular cross section, and the interval thereof gradually increases toward the rear in the rotation direction of the fan rotor 9. In this case, this interval is about 15 mm,
The distance between the back scroll 10 and the outer peripheral surface of the fan rotor 9 at the winding start portion S is about 5.0 times. The dimension from the winding start portion S of the back scroll 10 to the tip of the vortex stabilizing member 20 is about 28 mm, and the tangent to the winding start portion S of the back scroll 10 and the tip of the vortex stabilizing member 20 are measured. Is about 20 °.

(Second Embodiment) FIG. 3 shows a second embodiment. This uses an auxiliary member 24 in which a part of the shape is changed, and the basic points are substantially the same as those in the first embodiment. In this case, an arc-shaped convex pocket 29 is formed on the inner surface of the vortex stabilizing member 20 in the middle toward the outside in the radial direction of the fan rotor 9. In this case, the distance between the inner surface of the tip of the vortex stabilizing member 20 and the outer peripheral surface of the fan rotor 9 is about 14 mm,
The distance between the back scroll 10 and the outer peripheral surface of the fan rotor 9 at the winding start portion S is about 4.7 times. The dimension from the winding start portion S of the back scroll 10 to the tip of the vortex stabilizing member 20 is about 28 mm, and the tangent to the winding start portion S of the back scroll 10 and the tip of the vortex stabilizing member 20 are measured. Is about 16 °.

FIG. 4 shows the relationship between the air volume and generated noise in the above-described fan mechanism. FIG. 3 shows a conventional example having only the back drain side wall 21 in comparison with the first and second embodiments. As is clear from the figure, both of the above embodiments can reduce the amount of noise generated. In addition, when the rotation speed of the fan rotor 9 was set to be the same, it was confirmed that both of the above embodiments improved the air blowing performance as compared with the conventional one. As shown in FIG. 1, each performance is improved because the center of the vortex on the back side is stable outside the fan rotor 9 at a position upstream of the winding start portion S of the back scroll 10. It is confirmed that the cause is that the air flow along the back scroll 10 from the winding start portion S of the back scroll 10 is stabilized. In the case where the inner surface of the vortex stabilizing member 20 is formed in a convex shape toward the outside in the radial direction of the fan rotor 9 in the middle thereof as in the second embodiment, the vortex is formed in the convex portion. Is stably held. Also, if the vortex stabilizing member 20 is formed by attaching the auxiliary members 22 and 24 to the back drain side wall 21 as described above,
The back drain side wall 21 will be substantially extended,
Therefore, according to this structure, it is possible to reliably prevent a problem that drain water drops from the rear heat exchanger 3 to the fan rotor 9.

(Third Embodiment) FIG. 5 shows a third embodiment. In this embodiment, a flat auxiliary member 25 is attached to the inner surface of the back drain side wall 21 and the inner surface of the vortex stabilizing member 20 is formed in a flat shape. In this case, the distance between the inner surface of the tip portion of the vortex stabilizing member 20 and the outer peripheral surface of the fan rotor 9 is about 15 mm, and the winding start portion S
Is approximately 4.3 times the distance (3.5 mm) between the back scroll 10 and the outer peripheral surface of the fan rotor 9. The dimension from the winding start portion S of the back scroll 10 to the tip of the vortex stabilizing member 20 is about 28 mm, and the tangent to the winding start portion S of the back scroll 10 and the tip of the vortex stabilizing member 20 are measured. Is about 20 °.

(Comparative Example) In a first comparative example shown in FIG. 7, an auxiliary member 26 is attached to a back drain side wall 21 connected to the back scroll 10, and the back scroll 10 is smoothly rotated in the rotation direction of the fan rotor 9. It is extended to the back of.
That is, it has a structure in which the winding start portion S of the back scroll 10 is directly moved rearward in the rotation direction of the fan rotor 9. The second comparative example shown in FIG.
An auxiliary member 27 is continuously provided from the distal end of the back drain side wall 21 connected to the outer periphery of the fan rotor 9 so as to project between the winding start portion S of the back scroll 10 and the distal end of the auxiliary member 27. This is a structure in which a pocket 28 is formed.
In the conventional example having only the back drain side wall 21, the distance between the inner surface at the tip of the back drain side wall 21 and the outer circumferential surface of the fan rotor 9 is about 9.5 mm,
The distance between the back scroll 10 and the outer peripheral surface of the fan rotor 9 at the winding start portion S of the back scroll 9 (3.5 m)
m) is about 2.7 times. In the second comparative example, the distance between the inner surface of the distal end portion of the auxiliary member 27 and the outer peripheral surface of the fan rotor 9 is different from that of the back scroll 10 and the fan rotor 9 at the winding start portion S of the back scroll 9.
Is substantially equal to the distance from the outer peripheral surface.

FIG. 9 shows the relationship between the air volume and generated noise in the above-described fan mechanism. FIG. 7 shows a conventional example having only the back drain side wall 21, the third embodiment, and the first and second comparative examples in comparison. As is clear from the figure, in the third embodiment,
It is possible to reduce the amount of noise generation as compared with the conventional example.
Also, when the rotation speed of the fan rotor 9 was set to be the same, it was confirmed that the above-described third embodiment improved the air blowing performance over the conventional one. On the other hand, in the first comparative example and the second comparative example, it is apparent that the noise generation amount is significantly increased. It should be noted that in both comparative examples, no remarkable decrease in the blowing performance occurred.

The size of the vortex stabilizing pocket 23 formed by the vortex stabilizing member 20 was examined to obtain a preferable result.
As a result, the distance between the inner surface of the distal end portion of the vortex stabilizing member 20 and the outer peripheral surface of the fan rotor 9 is set to be equal to the distance between the outer peripheral surface of the back scroll 10 and the outer peripheral surface of the fan rotor 9 at the winding start portion S of the back scroll 10. 3 times or more, preferably 4 times
It is clear that if the number is twice or more, the center of the vortex on the back side can be held in a more stable state outside the fan rotor 9. On the other hand, the distance between the inner surface of the tip portion of the vortex stabilizing member 20 and the outer peripheral surface of the fan rotor 9 is 6 times the distance between the outer surface of the back scroll 10 and the outer peripheral surface of the fan rotor 9 at the winding start portion S of the back scroll 10. When it is larger than twice, further improvement of the effect of stabilizing the vortex position cannot be obtained, and in addition, the ventilation resistance increases, and a problem that the ventilation performance is deteriorated occurs. Therefore, if the distance between the inner surface of the tip end portion of the vortex stabilizing member 20 and the outer peripheral surface of the fan rotor 9 is within the above range, the ventilation position is not reduced and the vortex position is stabilized. It became clear that the advantages of reducing the amount of noise generation and improving the blowing performance were obtained. Beginning of winding S of back scroll 10
The angle between the tangent of the vortex stabilizing member 20 and the tangent of the vortex stabilizing member 20 was also examined. This angle is preferably 10 to 25 °, and more preferably 15 to 20 °.

Although the embodiment of the fan mechanism and the air-conditioning indoor unit having the fan mechanism of the present invention has been described above, the air-conditioning indoor unit having the fan mechanism and the fan mechanism of the present invention is limited to the above-described embodiment. Instead, the present invention can be implemented with various changes. For example, in the above description, the vortex stabilizing member 20 is attached to the back drain side wall 21 by the auxiliary members 22 and 2.
An example is shown in which the components 3 and 24 are attached to each other, but this is for the purpose of clarifying the comparison between the present invention and the conventional example. In practical use, these components are integrally formed. . By integrating the vortex stabilizing member 20 and the rear drain pan side wall 21 in this manner, there is an advantage that the operation can be performed without increasing the cost. Alternatively, the vortex stabilizing member 20 and the back drain side wall 21 may be configured separately, and the vortex stabilizing member 20 may be attached to the rear heat exchanger 3. Further, without using the vortex stabilizing member 20, for example, a recessed groove is provided on the back side of the back scroll 10 downstream of the winding start portion S, and the back side vortex is held in this portion. Such a structure is also within the scope of the invention of claim 1 of the present application. That is, in this case,
The vortex on the back side is held downstream of the winding start portion S of the back scroll 10. In the above description, the air-conditioning indoor unit that performs cooling and heating is described. However, the present invention can be applied to an air conditioner having another structure having a humidity control function such as dehumidification and humidification and an air purification function.

[0028]

According to the fan mechanism of the first aspect,
The turbulence of the air flow in the vicinity of the winding start portion of the back scroll is suppressed, and a smooth flow is achieved. As a result, it is possible to reduce the amount of noise generated and improve the blowing performance.

According to the fan mechanism of the second aspect, the turbulence of the air flow can be suppressed, the amount of noise generated can be reduced, and the blowing performance can be improved with a simple configuration.

According to the fan mechanism of the third aspect, the distance between the inner surface of the tip portion of the vortex stabilizing member and the outer peripheral surface of the fan rotor is properly selected, so that the ventilation performance is not reduced. The advantages of reducing the amount of noise generated due to the stabilization of the vortex position and improving the blowing performance can be obtained.

According to the fan mechanism of the fourth aspect, the position at which the vortex is generated can be further stabilized, and therefore, the advantages of reducing the amount of noise generated due to the stabilization of the vortex position and improving the blowing performance can be obtained.

The fan mechanism according to any one of claims 1 to 4 is
If the invention is applied to an air-conditioning indoor unit as described in claim 5, it is possible to improve the use comfort by reducing the noise generation amount and improving the blowing performance.

According to the air conditioner indoor unit of the sixth aspect, since the vortex stabilizing member and the rear drain pan side wall are integrated, the operation can be performed without increasing the cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of a first embodiment of a fan mechanism of the present invention.

FIG. 2 is a central longitudinal sectional view showing an embodiment of an air-conditioning indoor unit including a fan mechanism of the present invention.

FIG. 3 is a longitudinal sectional view showing a main part of a second embodiment of the fan mechanism of the present invention.

FIG. 4 is a graph showing the relationship between the air volume and the amount of generated noise in the first and second embodiments of the fan mechanism of the present invention in comparison with a conventional example.

FIG. 5 is a longitudinal sectional view showing a main part of a third embodiment of the fan mechanism of the present invention.

FIG. 6 is a vertical sectional view of a main part for explaining a problem of a conventional fan mechanism.

FIG. 7 is a longitudinal sectional view showing a main part of a first comparative example of the fan mechanism.

FIG. 8 is a longitudinal sectional view showing a main part of a second comparative example of the fan mechanism.

FIG. 9 is a graph showing the relationship between the air volume and the amount of generated noise of the third embodiment of the fan mechanism of the present invention in comparison with the conventional example and the first and second comparative examples.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 indoor unit casing 2 front heat exchanger 3 rear heat exchanger 9 fan rotor 10 back scroll 12 front casing 20 vortex stabilizing member 21 rear drain pan side wall 23 vortex stabilization pocket S back scroll start winding

Continuing on the front page (72) Inventor Takashi Okamoto 1000 Oya, Okamotocho, Kusatsu-shi, Shiga 2nd Daikin Industries, Ltd. Shiga Works F-term (reference) 3H031 AA00 AA03 BA14 BA33 3H034 AA02 AA18 BB02 BB07 BB19 CC04 DD09 DD25 DD28 EE06 EE08 EE12 EE18 3H035 DD01 DD05 3L049 BB04 BB08 BB11 BC01 BD02 3L050 BA01

Claims (6)

[Claims] In a cross-flow fan type fan mechanism including a fan rotor (9), a front casing (12), and a back scroll (10), a winding start portion (S) of the back scroll (10) is provided. The fan mechanism characterized in that the vortex center on the back side is located outside the fan rotor (9) in the vicinity of the fan rotor (9). 2. A vortex stabilizing member (20) extending from the winding start portion (S) of the back scroll (10) in a direction opposite to the direction of rotor rotation is provided. Between the inner surface of the vortex stabilizing member (20) and the outer peripheral surface of the fan rotor (9), a vortex stabilizing pocket (23) in which the distance therebetween gradually increases in the direction opposite to the rotor rotation direction. The vortex center on the back side is located upstream of the winding start portion (S) of the back scroll (10) outside the fan rotor (9). Fan mechanism. 3. The distance between the inner surface of the distal end of the vortex stabilizing member (20) and the outer peripheral surface of the fan rotor (9) is determined by the width of the back scroll (10) at the winding start portion (S) of the back scroll (10). 3. The fan mechanism according to claim 2, wherein the dimension is not less than three times and not more than six times the distance between the outer peripheral surface of the fan rotor and the fan rotor. 4. An inner surface of the vortex stabilizing member (20) is formed in the middle of the vortex stabilizing member so as to protrude radially outward of the fan rotor (9).
Or the fan mechanism according to claim 3. 5. An air-conditioning indoor unit comprising the fan mechanism according to claim 1. 6. A front heat exchanger (2) and a rear heat exchanger (3) are disposed in an indoor unit casing (1), and a rear drain pan (15) is provided below the rear heat exchanger (3). ), The fan mechanism according to any one of claims 2 to 4 is disposed between the front heat exchanger (2) and the rear heat exchanger (3). An air-conditioning indoor unit, wherein a vortex stabilizing member (20) and a rear drain pan side wall (21) are integrated.