JPH0972300A - Blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a blowing sound and air resistance extremely in a blower without arranging a member which makes an air resistance on the suction port of the fan. SOLUTION: For a Sirocco fan 3 arranged inside the casing 2 of an air conditioner 1 flush-mounted on a ceiling, the peripheral edge part end surface of its suction port 3c is formed into a triangle wave shape. The air flowing on this peripheral edge part end surface is straightened and a vortex flow generation area is reduced and an actual suction port diameter is expanded and the dead air area of a fan roter is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower provided in an air conditioner such as a ceiling-embedded type air conditioner, and more particularly to measures for reducing noise and air resistance in the blower.

[0002]

2. Description of the Related Art Conventionally, for example, an actual Kaihei 5-59118 is used.
As disclosed in Japanese Patent Laid-Open Publication No. JP-A-2004-242242, a ceiling-embedded air conditioner includes a main body casing installed in a space above the ceiling,
A decorative panel that is installed on the ceiling surface and that has a suction port and a blowout port that communicate with the internal space of the main body casing, and a blower is disposed in the central portion inside the main body casing, and an air blower downstream of the blower. A heat exchanger is arranged on the side. Then, by driving the blower, the indoor air sucked into the main body casing from the suction port of the decorative panel is blown out from the blower toward the heat exchanger, and the temperature is adjusted when passing through the heat exchanger. Then, it is supplied to the indoor space from the outlet of the decorative panel.

Further, around the blower, members that act as air resistance (suction grill, air filter, etc.) are arranged, and these members disturb the flow of air and disturb the flow to the blower. Since air is introduced as it is, this causes air blow noise and air resistance to increase. That is, both the blowing noise and the air resistance in the vicinity of the blower become larger when the blower is incorporated in the air conditioner than in the blower alone. One of the causes of generation of the blowing noise and the air resistance is a vortex flow at the peripheral portion of the suction port formed in the casing of the blower. FIG. 11 shows a vortex flow generation state at the peripheral portion of the suction port (a). When such a vortex flow is generated, the amount of air suctioned is small in the vortex flow generation region, so the actual suction port diameter for sucking air is the dimension t inside the vortex flow generation region. When the actual suction port diameter t is small, the fan rotor (c) arranged in the casing (b) has a large area (generally called dead water area) s where almost no air flows. As a result, a sufficient amount of air is not blown out.

Therefore, in this type of blower, there is a demand for reducing the turbulent flow of air on the suction side of the blower to reduce the blowing noise and air resistance as much as possible. In order to meet this demand, for example, as disclosed in Japanese Unexamined Patent Publication No. 5-65899, a sirocco fan is provided with a lattice at its suction port, and blasting noise and air resistance are reduced by the rectifying action of the lattice. Is proposed.

[0005]

However, in such a structure, since the grid itself causes air resistance and hinders the effect due to the rectifying action, it is necessary to reduce the blowing noise and the air resistance. There was a limit.

The present invention has been made in view of these points, and it is possible to significantly reduce the blowing noise and the air resistance in the blower without disposing a member that becomes the air resistance in the suction port of the blower. With the goal.

[0007]

In order to achieve the above-mentioned object, the present invention provides a rectifying action of air at the peripheral portion of the suction inlet of a blower, whereby a vortex flow at the peripheral portion of the suction inlet is generated. The generation area is reduced.

Specifically, the invention according to claim 1 is, as shown in FIG. 4, an air suction portion (3e) having an air suction port (3c).
And a blower (3) arranged downstream of the air suction section (3e).
d) is provided, and it is premised on a blower in which the air sucked from the air suction port (3c) is pressure-fed by the blower means (3d). A rectifying means (15) for guiding the air flowing through the peripheral portion of the air suction port (3c) toward the blower means (3d) while rectifying the air flowing through the peripheral portion is provided.

With this configuration, when the air sucked from the air suction port (3c) by the blowing means (3d) is pressure-fed, the air flowing around the peripheral edge of the air suction port (3c) is rectified by the rectifying means (15). Will be done. Therefore, the vortex flow generation region at the peripheral portion of the suction port is reduced, and accordingly, the actual suction port diameter is increased and the dead water area is reduced.

According to a second aspect of the present invention, in the blower according to the first aspect, the rectifying means (15) has a corrugated peripheral edge portion of the air suction port (3c).

With this structure, the vortex flow generation region at the peripheral portion of the suction port can be reduced with a simple structure such as changing the shape of the peripheral portion of the air suction port (3c).

According to a third aspect of the present invention, in the blower according to the second aspect, the peripheral portion of the air suction port (3c) has a triangular wave shape.

According to a fourth aspect of the present invention, in the blower according to the second aspect, the corrugated shape of the peripheral portion of the air suction port (3c) is sinusoidal.

According to a fifth aspect of the present invention, in the blower according to the second aspect, the peripheral portion of the air suction port (3c) has a rectangular wave shape.

With these configurations, the shape of the peripheral portion of the air suction port (3c) can be embodied, and the practicality of the structure for reducing the vortex flow generation region at the peripheral portion of the suction port is improved.

The invention according to claim 6 is the above-mentioned claim 1,
The blower of 2, 3, 4 or 5 WHEREIN: An air suction part
The air sucked through (3e) from the air suction port (3c)
As shown in d), it is formed so as to be curved toward the downstream side of the air flow toward the center of the air suction port (3c).

With this structure, the air sucked from the air suction port (3c) is guided to the blower means (3d) along the curved shape of the air suction portion (3e), and then is rectified by the rectifying means (15). Will be rectified. Therefore, due to these synergistic effects, the air can be smoothly sent to the blowing means (3d), and the blowing noise and the air resistance are significantly reduced.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a ceiling-embedded air conditioner (1) according to the present embodiment, FIG. 2 is a bottom view thereof (a view as seen from the indoor side when installed on the ceiling surface), and FIG. FIG. 3 is an enlarged view of a cross section taken along line III-III in FIG. 2.
As shown in FIG. 3, the air conditioner (1) has a ceiling
The main casing (2), which is inserted into the opening (H) formed in (R) and opens downward, is installed in the space above the ceiling (S). The main casing (2) includes a top plate (2a) and side plates (2b) extending downward from the outer edge of the top plate (2a). Further, in the center of the main casing (2), there is a blower (3) having a suction port (3c) that opens laterally (vertical direction of the paper) and a blowout port (3a) that opens upward. It is arranged. This blower (3) has a plurality of blades (3g, 3g, ...) Inside a resin fan casing (3b) as shown in FIG.
The sirocco fan accommodates the fan rotor (3d) as a blowing means, and the air sucked from the suction port (3c) along with the rotation of the fan rotor (3d) is blown above the air outlet (3a). To discharge. The blower (3) is supported by a fan top plate (3i) that divides the suction side and the discharge side. Further, with respect to the blower (3), heat exchangers (4, 4 ') are arranged on both left and right sides of FIG. 3 (both sides in the width direction of the air conditioner). This heat exchanger (4, 4 ') is connected to the outdoor unit via a refrigerant pipe (12) (see FIG. 1), and functions as an evaporator during cooling operation and as a condenser during heating operation,
Heat is exchanged with the air discharged from the blower (3) to adjust the temperature of the air. Further, a drain pan (5) is arranged below the heat exchanger (4), and the condensed water generated in the heat exchanger (4) during the cooling operation is collected as a drain to the drain pipe (13). It is designed to be discharged.

A decorative panel (6) is attached to the lower end of the body casing (2). This Makeup Panel (6)
Has an opening (6a) formed in the center thereof.
A cover panel smaller than the opening (6a) in the center of a)
(7) is provided, and on both outer sides of the cover panel (7),
Air inlets (6b, 6b) for introducing indoor air into the main casing (2) are formed. In other words, the air inlets (6b, 6b) are the same as those shown in FIGS. 1 and 2.
The air conditioner (1) is provided at two locations, and each extends in the longitudinal direction of the air conditioner (1) (left-right direction in FIG. 2). Also,
As shown in FIG. 3, the cover panel (7) is provided with hook portions (7a, 7a) whose both side edges are curved. The hook portions (7a, 7a) are attached to the decorative panel (6). It is integrally assembled to the decorative panel (6) in a state where it is locked by the locking pins (6c, 6c) extending in the horizontal direction and prevented from falling. In addition, the air inlet (6
An air filter (8) is provided at a position facing b, 6b) to prevent dust from entering the body casing (2).

Further, air outlets (6d, 6d) are formed at both side edges (both side edges in the vertical direction in FIG. 2) of the decorative panel (6). The air outlets (6d, 6d) are parallel to the outer member (9) forming the outer edge of the decorative panel (6) and the inner position at a predetermined distance from the outer member (9). It is formed between the extending inner member (10).
Then, the conditioned air generated in the heat exchanger (4) is supplied to the indoor space by the air outlets (6d, 6d). In this way, the air inlet (6
b), air filter (8), blower (3), heat exchanger (4,4 '),
An air flow passage (A) is formed across the air outlet (6d).

At the center of each air outlet (6d, 6d), there is a horizontal blade (6) capable of changing the blowing direction of the conditioned air blown into the indoor space from each air outlet (6d, 6d). 11) is rotatably arranged. The horizontal blade (11) is a long plate made of resin, and support pins (not shown) project from both sides in the longitudinal direction of the plate, and the support pins are rotatably attached to the decorative panel (6). It is supported, and is rotated about the support pin by driving a motor (not shown).

Next, as a feature of this embodiment, the structure of the suction port (3c) of the fan casing (3b) of the blower (3) will be described. As shown in FIG. 5, the fan casing (3
The outer peripheral part of the suction port (3c) of b) is a bell mouth part as an air suction part which is curved inward (upward in FIG. 5 on the fan rotor (3d) side) toward the opening edge (center part).
(3e), the end surface (3f) of the inner edge of the bell mouth portion (3e) is formed in a concavo-convex shape in a plurality of triangular waves over the entire circumference. FIG. 6 is an enlarged view of the end surface (3f) of the inner edge portion. The specific dimensions of the end face (3f) are set such that the triangular wave pitch P is 2 mm and the height H is 1 mm. The size of the end face (3f) is not limited to this, and can be arbitrarily set, for example, in the range of the pitch P of 2 to 8 mm and the height H of 1 to 5 mm. In this way, the rectifying means (15) according to the present invention is constructed.

Due to the shape of the end surface (3f) of the suction port (3c), the air introduced into the fan casing (3b) along the shape of the bell mouth portion (3e) is a triangular wave end surface ( 3f)
It is configured to be rectified by.

Next, the air conditioner configured as described above
The operation of (1) will be described. During this air conditioning operation, the blower (3) is driven, that is, the fan rotor (3d) is rotated in the fan casing (3b), and the air suction port (6b) is
The room air sucked into the main casing (2) from the inside is blown after dust is removed by the air filter (8).
After passing through (3), it is passed to the heat exchanger (4, 4 '). Then, in this heat exchanger (4, 4 '), heat is exchanged with the refrigerant to adjust the temperature (cooling in the cooling operation, heating in the heating operation), and then the air outlet ( The air is blown from 6d) into the indoor space to perform air conditioning of the indoor space.

In such a driving operation, the blower (3)
Among the air introduced into the fan casing (3b), the air introduced along the curved shape of the bell mouth portion (3e) is rectified by the triangular wave end surface (3f). As a result of this rectifying action, as shown in FIG. 10, the generation region of the vortex generated in the bell mouth portion (3e) is reduced. Therefore, the actual suction port diameter T is enlarged and the dead water area S is reduced as compared with the conventional one (shown in FIG. 11). That is, it is possible to reduce the blowing noise by reducing the eddy current, and it is possible to increase the blowing amount by reducing the air resistance accompanying the increase of the suction port diameter T and the reduction of the dead water area S. Further, this rectifying structure does not cause air flow resistance such as a grid provided in the conventional suction port, and therefore does not impede reduction of blowing noise and air resistance.

Thus, according to this embodiment, the blower (3)
The blower (3) only by changing the shape of the inner peripheral side end face (3f)
It is possible to reduce both the blowing noise and the air resistance in the air conditioner, and to improve both the quietness and the air conditioning performance of the air conditioner.

-Experimental Example- Next, an experimental example conducted for confirming the effects of the present invention will be described. In the present experiment, the blowing noise and the blowing air amount were measured while increasing the rotation speed of the fan rotor in each of the present invention shown in FIG. 10 and the conventional example shown in FIG. FIG. 7 shows the result.
As can be seen from this figure, the blowing noise is lower in the configuration according to the present invention, and it has been confirmed that this improves the quietness of the air conditioner. Especially the fan rotor (3d)
The higher the rotation speed of, the more remarkable. Moreover, the amount of blown air is higher in the configuration according to the present invention, and it has been confirmed that this improves the air conditioning performance of the air conditioner.

Next, the end surface (3) of the inner edge of the bell mouth part (3e) is
A modified example of the shape of f) will be described. What is shown in FIG. 8 is formed in a sine wave shape, and what is shown in FIG. 9 is formed in a rectangular wave shape. The end face (3
Even when f) is formed, the rectifying action of the introduced air can be obtained in the same manner as described above, which can reduce both the blowing noise and the air resistance in the blower, and the air conditioner. Both the quietness and the air conditioning performance can be improved.

In the present embodiment, the case where the present invention is applied to the ceiling-embedded air conditioner (1) has been described. However, the present invention is not limited to this, and the ceiling hanging type, the wall hanging type, etc. It is applicable to various air conditioners.

A fan casing of a sirocco fan
Although the case where it is applied to the end surface (3f) of the suction port (3c) of (3b) has been described, it is also possible to apply it to the suction port end surface of the bell mouth arranged on the suction side of the turbofan.

[0031]

As described above, according to the present invention, the following effects can be obtained. According to the invention described in claim 1, since the rectifying means for guiding the air flowing through the peripheral portion of the air suction port of the blower toward the blowing means while rectifying the air flowing through the peripheral portion is provided, the rectifying action of the rectifying means. Due to this, the vortex flow generation area at the periphery of the suction port is reduced, and along with this the actual suction port diameter is expanded and the dead water area is reduced, so it is possible to reduce the blowing noise and air resistance, and the conventional suction port It is possible to improve both the quietness and the blowing capacity of the blower without inviting an increase in the flow resistance of the air as in the case where the grid is provided.

According to the second aspect of the invention, since the rectifying means has the corrugated shape of the peripheral portion of the air suction port, the vortex generation region at the peripheral portion of the suction port is reduced with a simple structure. Therefore, it is possible to obtain the above-described effect of claim 1 without causing a large increase in the manufacturing cost of the blower.

In the invention of claim 3, the corrugated shape of the peripheral portion of the air suction port is triangular wave, in the invention of claim 4 sinusoidal, and in the invention of claim 5 rectangular wave. This makes it possible to embody the shape of the peripheral portion of the air suction port and improve the practicality of the configuration for reducing the vortex flow generation region at the peripheral portion of the suction port.

According to the sixth aspect of the invention, since the air suction portion is formed so as to be curved toward the downstream side of the air flow toward the center of the air suction port, the air sucked from the air suction port is blown. It is possible to smoothly guide to the means, and by the synergistic effect with the effect according to the invention described in claim 1, the blowing noise and the air resistance can be greatly reduced,
It is possible to further improve the quietness and the blowing ability of the blower.

[Brief description of drawings]

FIG. 1 is a perspective view of a ceiling-embedded air conditioner according to an embodiment of the present invention.

FIG. 2 is a view of the air conditioner viewed from the indoor side.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a perspective view in which a part of the blower is cut away.

FIG. 5 is a perspective view showing a shape of a bell mouth portion.

FIG. 6 is an enlarged view showing an end surface shape of a bell mouth portion.

FIG. 7 is a diagram showing a result of an experimental example.

FIG. 8 is a view corresponding to FIG. 6 in a modified example.

FIG. 9 is a view corresponding to FIG. 6 in another modification.

FIG. 10 is a diagram showing a vortex flow generation state at the blower suction port in the present invention.

FIG. 11 is a diagram showing a vortex flow generation state at a blower suction port in a conventional example.

[Explanation of symbols]

 (3) Blower (3c) Suction port (3d) Fan rotor (blowing means) (3e) Bell mouth part (air suction part) (3g) Blades (15) Straightening means

Claims (6)

[Claims] 1. An air suction part (3e) having an air suction port (3c).
And a blower means (3d) arranged on the downstream side of the air suction part (3e), and blows the air sucked from the air suction port (3c) into the blower means (3d).
In the blower that is pressure-fed by, a rectifying means (15) for guiding the air flowing through the air inlet (3c) toward the air blowing means (3d) while rectifying the air flowing through the peripheral edge is provided. Blower characterized by. 2. The blower according to claim 1, wherein the rectifying means (15) is configured such that the peripheral portion of the air suction port (3c) is corrugated. 3. The blower according to claim 2, wherein the wave shape of the peripheral portion of the air suction port (3c) is a triangular wave shape. 4. The blower according to claim 2, wherein the wave shape of the peripheral portion of the air suction port (3c) is a sine wave. 5. The blower according to claim 2, wherein the wave shape of the peripheral portion of the air suction port (3c) is a rectangular wave shape. 6. The air suction part (3e) guides the air sucked from the air suction port (3c) to the air blowing means (3d) so that the air flow becomes closer to the center of the air suction port (3c). Curved to the downstream side, Claims 1, 2, 3, 4
Or the blower described in 5.