JP3120959B2 - Blower - Google Patents

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 mounted type, and more particularly to a measure for reducing noise and air resistance in the blower.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Utility Model Laid-Open No. 5-59118.
As disclosed in the publication, the ceiling embedded type air conditioner has a main body casing installed in the space above the ceiling,
A decorative panel provided on a ceiling surface and having a suction port and an air outlet communicating with the internal space of the main body casing, a blower is disposed in a central portion of the inside of the main body casing, and an air outlet downstream of the blower is provided. A heat exchanger is arranged on the side. Then, by driving the blower, the room air sucked into the main body casing from the inlet of the decorative panel is blown out from the blower toward the heat exchanger, and when passing through the heat exchanger, the temperature is adjusted and the conditioned air is adjusted. As a result, the air is supplied to the indoor space from the outlet of the decorative panel.

[0003] In addition, members (air suction grills, air filters, etc.) that provide air resistance are arranged around the blower, and the flow of air is disturbed by these members, and this flow is disturbed to the blower. Since the air is introduced as it is, this causes the blowing noise and the air resistance to increase. That is, the airflow noise and the air resistance in the vicinity of the blower are both larger when the air conditioner is incorporated into the air conditioner than when the blower is used alone. One of the causes of the generation of the blowing noise and the air resistance is a vortex at the periphery of the suction port formed in the casing of the blower. FIG. 11 shows a state of generation of a vortex at the periphery of the suction port (a). When such a vortex is generated, since the amount of air suction is small in the vortex generation region, the actual suction aperture for sucking air is the dimension t inside the vortex generation region. When the actual suction diameter t is small as described above, a region (generally called dead water region) s where almost no air flows in the fan rotor (c) disposed in the casing (b) is large. As a result, a sufficient air blowing amount cannot be obtained.

[0004] For this reason, in this type of blower, there is a demand that the turbulence of the air on the suction side of the blower be reduced to reduce the blowing noise and the air resistance as much as possible. For example, as disclosed in Japanese Patent Application Laid-Open No. 5-65899, a sirocco fan is provided with a grid at its suction port, and the rectifying action of the grid reduces the blowing noise and air resistance. Has been proposed.

[0005]

However, in such a configuration, the grid itself causes air resistance and hinders the effect of the rectifying action. Had limitations.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to significantly reduce the blowing noise and the air resistance in a blower without disposing a member which serves as an air resistance at a suction port of the blower. With the goal.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rectifying effect of air at a peripheral portion of a suction port of a blower. The generation area has been reduced.

More specifically, as shown in FIG. 4, the air suction port (3c) is formed and the air suction port is formed so as to guide suction air to the air suction port (3c). (3c) The air suction part curved toward the downstream side of the air flow as it goes
(3e), and a fan rotor (3d) disposed in the casing (3b) .The rotation of the fan rotor (3d) causes air outside the casing (3b) to rotate. The air suction port (3c) is bent along the air suction section (3e),
Through the fan rotor (3d) to blow the air, wherein the end surface (3f) of the peripheral portion of the air suction port (3c) is formed in a wavy shape with irregularities on the downstream side of the air flow. Configuration.

With this configuration, when the air sucked from the air inlet (3c) is blown by the fan rotor (3d), the air flowing through the peripheral portion of the air inlet (3c) is subjected to the wave formed on the end face thereof. The flow is rectified by the shape (15). For this reason, the generation region of the vortex at the peripheral portion of the suction port is reduced, and accordingly, the actual diameter of the suction port is enlarged and the dead water area is reduced. The air sucked from the air inlet (3c) is
After being guided along the curved shape of the air suction part (3e), it is rectified by the wave shape (15). For this reason, the air can be smoothly fed into the fan rotor (3d) by the synergistic action of these, and the blowing noise and the air resistance are greatly reduced.

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

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

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

According to a fifth aspect of the present invention, in the blower according to the first aspect, the peripheral shape of the air suction port (3c) has a wave pitch of 2 to 8 mm and a wave height of 1 to 5 mm.
Is formed.

With these configurations, the shape of the peripheral portion of the air inlet (3c) can be embodied, and the practicability of the configuration for reducing the vortex generation region at the peripheral portion of the air inlet is improved.

[0015]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an in-ceiling air conditioner (1) according to the present embodiment, FIG. 2 is a bottom view thereof (a view as seen from the indoor side in a state of being installed on a 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 present air conditioner (1)
A main casing (2) that is inserted and arranged in an opening (H) formed in (R) and that opens downward is installed in the space above the ceiling (S). The main casing (2) includes a top plate (2a) and a side plate (2b) extending downward from an outer edge of the top plate (2a). A blower (3) having a suction opening (3c) opening laterally (in a direction perpendicular to the paper surface) and an air outlet (3a) opening upward is provided in the center of the main casing (2). It is arranged. As shown in FIG. 4, the blower (3) includes a plurality of blades (3g, 3g,...) In a resin fan casing (3b).
The sirocco fan accommodates a fan rotor (3d) as a blowing means provided with air blown from the air outlet (3a) through the air inlet (3c) with the rotation of the fan rotor (3d). To be discharged. The blower (3) is supported by a fan top plate (3i) that partitions the suction side and the discharge side. In addition, heat exchangers (4, 4 ') are disposed on the left and right sides (both sides in the width direction of the air conditioner) of Fig. 3 with respect to the blower (3). The heat exchanger (4, 4 ′) is connected to an outdoor unit via a refrigerant pipe (12) (see FIG. 1), and functions as an evaporator during a cooling operation and as a condenser during a heating operation,
The heat is exchanged with the air discharged from the blower (3) to adjust the temperature of the air. Also, a drain pan (5) is provided below the heat exchanger (4), and the condensed water generated in the heat exchanger (4) during cooling operation is collected as drain and sent to the drain pipe (13). It is designed to discharge.

A decorative panel (6) is attached to the lower end of the main casing (2). This decorative panel (6)
Has an opening (6a) in the center thereof, and the opening (6a)
In the center of a), a cover panel smaller than the opening (6a)
(7) is arranged, and on both outer portions of the cover panel (7),
An air inlet (6b, 6b) for introducing room air into the main body casing (2) is formed. That is, as shown in FIGS. 1 and 2, the air inlets (6b, 6b)
(1), each extending in the longitudinal direction of the air conditioner (1) (the 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, and the hook portions (7a, 7a) are attached to the decorative panel (6). It is locked to the provided horizontally extending locking pins (6c, 6c) and is integrally assembled to the decorative panel (6) in a state where it is prevented from dropping. Also, the air inlet (6
An air filter (8) is provided at a position facing the b, 6b) to prevent dust from entering the main body casing (2).

Air outlets (6d, 6d) are formed at both side edges (upper and lower side edges in FIG. 2) of the decorative panel (6). Each of the air outlets (6d, 6d) is parallel to an outer member (9) forming the outer edge of the decorative panel (6) and an inner position at a predetermined distance from the outer member (9). It is formed between the inner member (10) that extends.
The air outlets (6d, 6d) supply the conditioned air generated in the heat exchanger (4) to the indoor space. In this way, the air inlet (6
b), air filter (8), blower (3), heat exchanger (4,4 '),
An air flow passage (A) is formed over the air outlet (6d).

At the center of each of the air outlets (6d, 6d), horizontal blades (6) that can change the blowing direction of the conditioned air blown from each of the air outlets (6d, 6d) into the indoor space are provided. 11) is disposed rotatably. The horizontal blade (11) is a long plate made of resin, and has support pins (not shown) projecting from both sides in the longitudinal direction thereof. The support pins are rotatable on the decorative panel (6). The support pin is supported, and a rotation operation about the support pin is performed by driving a motor (not shown).

Next, as a feature of this embodiment, the configuration 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 portion of the suction port (3c) of b) is a bell mouth portion as an air suction portion that curves inward (upward in FIG. 5 on the side of the fan rotor (3d)) toward the opening edge (center portion).
(3e), and the end face (3f) of the inner edge of the bell mouth portion (3e) is formed with a plurality of triangular waves in the form of a plurality of triangular waves over the entire circumference. FIG. 6 is an enlarged view of the end face (3f) of the inner edge. As specific dimensions of the end face (3f), the pitch P of the triangular wave is set to 2 mm, and the height H is set to 1 mm. The size of the end face (3f) is not limited to this, and can be set arbitrarily, for example, when the pitch P is in the range of 2 to 8 mm and the height H is in the range of 1 to 5 mm. Thus, the rectification means (15) according to the present invention is constituted.

Due to the shape of the end face (3f) of the suction port (3c), the air introduced into the fan casing (3b) along the shape of the bell mouth portion (3e) is displaced by the triangular wave end face (3f). 3f)
The rectification is performed.

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

In such an 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). Due to this rectifying action, as shown in FIG. 10, the region where the vortex is generated in the bell mouth portion (3e) is reduced. For this reason, the actual suction diameter T is increased and the dead water area S is reduced as compared with the conventional one (shown in FIG. 11). That is, the blowing noise can be reduced by reducing the eddy current, and the blowing volume can be increased by reducing the air resistance accompanying the expansion of the suction aperture T and the reduction of the dead water area S. In addition, since this rectifying structure does not have the flow resistance of the air such that a grid is provided in the conventional suction port, it does not hinder the reduction of the blowing sound and the air resistance.

As described above, according to the present embodiment, the blower (3)
Only by changing the shape of the inner peripheral end surface (3f) of the blower (3)
In this case, both the blowing noise and the air resistance can be reduced, and both the quietness and the air conditioning performance of the air conditioner can be improved.

-Experimental Example- Next, an experimental example performed to confirm the effect of the present invention will be described. In this experiment, the blowing sound and the blowing air amount were measured while increasing the rotation speed of the fan rotor in each of the apparatus according to the present invention shown in FIG. 10 and the apparatus according to the conventional example shown in FIG. FIG. 7 shows the result.
As can be seen from this figure, it was confirmed that the blow sound was lower in the configuration according to the present invention, and thereby the quietness of the air conditioner was improved. In particular, the fan rotor (3
This is more noticeable as the rotation speed in d) is higher. In addition, the blowing air volume is
The configuration according to the present invention is higher, 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 portion (3e)
A modified example of the shape of f) will be described. The one shown in FIG. 8 is formed in a sine wave shape, and the one shown in FIG. 9 is formed in a rectangular wave shape. The end face (3
Even in the case where f) is formed, similarly to the above, it is possible to obtain a rectifying action of the introduced air, and thereby it is possible to reduce both the blowing sound and the air resistance in the blower, and the air conditioner The silence and air-conditioning performance can both be improved.

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

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

[0028]

As described above, according to the present invention, the following effects can be obtained. According to the first aspect of the present invention, the air flowing through the peripheral edge is rectified by providing the end face of the peripheral edge of the air suction port of the blower with a corrugated shape formed unevenly on the downstream side in the air flow direction. The rectifying action reduces the vortex generation area around the suction port, and the actual suction port diameter increases to reduce the dead water area. In addition, the air resistance can be reduced, and both the quietness and the blowing ability of the blower can be improved without increasing the air flow resistance as in the case where a grid is provided in the conventional suction port.

Further, since the air suction portion is formed to be curved downstream of the air flow toward the center of the air suction port, the air sucked from the air suction port is smoothly guided toward the fan rotor. In combination with the above effects, the blowing noise and the air resistance can be significantly reduced, and the quietness and the blowing capacity of the blower can be further improved.

According to the second aspect of the present invention, the wave shape of the peripheral portion of the air inlet is triangular, the third aspect is a sine wave, the fourth aspect is a rectangular waveform,
In the invention according to claim 5, since the wave pitch is 2 to 8 mm and the wave height is 1 to 5 mm, the shape of the peripheral portion of the air inlet can be embodied by these, and the vortex generation region at the peripheral portion of the air inlet can be reduced. The practicality of the configuration for reduction can be improved.

[Brief description of the drawings]

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

FIG. 2 is a diagram of the air conditioner as 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 part.

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

FIG. 7 is a diagram showing the results of an experimental example.

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

FIG. 9 is a diagram corresponding to FIG. 6 in another modified example.

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

FIG. 11 is a view showing a state in which a vortex is generated at a blower suction port in a conventional example.

[Explanation of symbols]

 (3) Blower (3c) Suction port (3d) Fan rotor (3e) Bell mouth part (air suction part) (3g) Blade (15) Rectifying means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-1409 (JP, A) JP-A-55-112898 (JP, A) JP-A-59-129799 (JP, A) 80097 (JP, A) JP-A-3-233196 (JP, A) JP-A-7-145799 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04D 29 / 28,29 / 44 F04D 29 / 54,29 / 66 F24F 1/00

Claims (5)

(57) [Claims] 1. An air suction port (3c) is formed, and suction air is formed.
Toward the the air suction port air intake port so as to guide the (3c) (3c)
A casing (3b) having an air suction portion (3e) curved downstream of the air flow in accordance with the above, and a fan rotor (3d) disposed in the casing (3b); ), The casing (3b)
A blower for bending outside air along the air suction portion (3e) and guiding the air to the fan rotor (3d) through the air suction port (3c) to blow the air. An end face (3f) of the peripheral portion is a blower formed in a wavy shape with irregularities formed on the downstream side of the air flow. 2. The blower according to claim 1, wherein the wavy shape of the peripheral portion of the air suction port is triangular. 3. The blower according to claim 1, wherein the wavy shape of the peripheral portion of the air suction port is sinusoidal. 4. The blower according to claim 1, wherein the wavy shape of the peripheral portion of the air suction port is rectangular. 5. The blower according to claim 1, wherein the wave shape of the peripheral portion of the air inlet (3c) has a wave pitch of 2 to 8 mm and a wave height of 1 to 5 mm.