JPH09229409A - Air supply device and ceiling-embedded air conditioner using air supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air supply device which reduces the generation of an absorption sound in an attempt to absorb an air as much as possible and a ceiling-embedded air conditioner which uses the air supply device. SOLUTION: In a ceiling-embedded air conditioner where a fan 7 is fixed with the top 4a of a casing 4 of the air conditioner in which a heat exchanger 10 is laid out around this fan 7 and the air absorbed with this fan 7 is discharged at the heat exchanger 10, a fan nozzle 13a, which extends in the peripheral direction of this fan is arranged to face the inner peripheral area of a shroud 7c of the fan 7. A baffle plate 13b is extended in the peripheral direction of this fan on the outer periphery of the shroud 7c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise control measure for a blower and a ceiling-embedded air conditioner.

[0002]

2. Description of the Related Art Generally, a turbofan is fixed to the top surface of a casing of an air conditioner, a heat exchanger is arranged around the turbofan, and air sucked by the turbofan is
A ceiling-embedded air conditioner that blows air toward the heat exchanger is known.

[0003]

Although various noise countermeasures have been conventionally taken in this type, the current noise level is about 50 dB, and it is necessary to suppress this noise as much as possible. It is extremely important for maintaining the quality of air conditioners.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technique and to reduce the suction noise generated when sucking air as much as possible, and a ceiling using the blower. To provide an embedded air conditioner.

[0005]

According to a first aspect of the present invention, a fan nozzle extending in the circumferential direction of the fan faces the inner circumference of the shroud of the blower fan, and the outer circumference of the shroud extends in the circumferential direction of the fan. It is characterized by extending a baffle that extends to.

According to a second aspect of the present invention, a fan nozzle extending in the circumferential direction of the fan faces the inner circumference of the shroud of the blower fan, and a baffle plate extending in the circumferential direction of the fan extends on the outer circumference of the shroud. The baffle plate and the fan nozzle are integrally formed.

According to a third aspect of the present invention, a blower fan is fixed to the top surface of the housing of the air conditioner, a heat exchanger is arranged around the blower fan, and the air sucked by the blower fan is In a ceiling-embedded air conditioner that discharges toward the heat exchanger, a fan nozzle that extends in the circumferential direction of the fan faces the inner circumference of the shroud of the blower fan,
A baffle plate extending in the circumferential direction of the fan is provided on the outer circumference of the shroud.

According to a fourth aspect of the present invention, a blower fan is fixed to the top surface of the casing of the air conditioner, a heat exchanger is arranged around the blower fan, and the air sucked by the blower fan is In a ceiling-embedded air conditioner that discharges toward the heat exchanger, a fan nozzle that extends in the circumferential direction of the fan faces the inner circumference of the shroud of the blower fan,
A baffle plate extending in the circumferential direction of the fan is extended on the outer periphery of the shroud, and the baffle plate and the fan nozzle are integrally formed.

According to the ceiling-embedded air conditioner having such a structure, a part of the air discharged from the blower fan is
The air is not discharged toward the heat exchanger and flows into the suction port of the blower fan from between the blower fan and the fan nozzle, causing so-called "wind entrainment" in the suction port of the blower fan. This "wind entrainment" causes noise in the air conditioner. This has been confirmed through demonstration tests. According to these inventions, since the baffle extending in the circumferential direction of the fan is extended to the outer periphery of the shroud of the blower fan, the baffle shields the circling wind, so that "wind entrainment" is reduced. The noise is suppressed compared to the conventional one.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
This will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 is an air conditioner installed on a ceiling 2 of a house, which is generally called a "four-way cassette".

This air conditioner 1 has a housing 4 suspended from a ceiling hanging bolt 3, a decorative panel 5 exposed from the ceiling, and a space between the decorative panel 5 and the housing 4. And a chamber (“filter chamber”) 6 arranged therein.

Reference numeral 7 denotes a blower fan ("turbo fan") arranged substantially in the center of the housing 4, 8 denotes a motor for driving the fan 7, and the motor 8 is mounted on the housing 4 by a mounting member 9. It is fixed to the surface 4a. Reference numeral 10 is a heat exchanger arranged so as to surround the fan 7, 11 is a drain pan arranged below the heat exchanger 10, and an air passage 12 is formed in the center thereof. Reference numeral 13 is a suction plate attached to the lower surface of the drain pan 11. As shown in FIG. 2, an inner peripheral side tongue (hereinafter referred to as “fan nozzle”) 13a and an outer peripheral side tongue 13b are formed on the suction plate 13,
An orifice 14 is provided in the inner peripheral portion of the fan nozzle 13a.
Are formed.

This orifice 14 will be described with reference to FIG.
It faces the suction port 40 of the fan 7. That is, the inside of the ventilation passage 12 is divided into the primary side space 15 and the secondary side space 16 by the suction plate 13, and the fan 7 is located in the ventilation passage 12. Below the primary side space 15 is a suction port 17. Reference numeral 18 is an air outlet, and 19 is a heat insulating material attached to the inner wall of the housing 4. A suction grille 20 is provided in the center of the decorative panel 5, and a blowout port 21 is provided around the suction grille 20.

A wind direction changing blade 22 is arranged at the outlet 21. Reference numeral 23 is a pre-filter arranged on the back side of the suction grill 20.

The filter chamber 6 is arranged between the decorative panel 5 and the housing 4. Inside the chamber 6, a suction space (ventilation passage) 25 in which a high-performance filter 24 is provided, and this suction space. Four discharge spaces 26 provided outside 25 are formed. The suction space 25 connects the suction port 17 of the housing 4 to the suction grill 20 of the decorative panel 5, and the discharge space 26 connects the air outlet 18 of the housing 4 to the air outlet 21 of the decorative panel 5. ing.

The filter chamber 6 is provided with an outside air introducing portion (“opening”) 51, and a connecting duct 53 is connected to the outside air introducing portion 51, and the connecting duct 5 is connected.
An outside air introducing duct 27 is connected to the unit 3. The central axes of the outside air introducing duct 27 and the outside air introducing portion 51 are separated by a distance L1. According to this, when the outside air introducing duct 27 is connected, the outside air introducing duct 27 is separated from the ceiling plate 2 by the distance L2, so that a working space is secured and the connection is simplified.

Reference numeral 28 denotes a booster fan device provided in the outside air introducing duct 27.
A filter 29 and a booster fan 30 are housed in 8. By operating this booster fan 30, the housing 4
Outside air is introduced inside. The outside air introduction portion 51 connected to the outside air introduction duct 27 penetrates the side portion of the filter chamber 6 and faces the suction space 25 of the filter chamber 6.

The outside air is introduced by the booster fan device 28. In this case, the outside air introduced through the outside air introduction duct 27 is introduced into the filter chamber 6 through the suction space 25, and merges with the room air that has passed through the high-performance filter 24, and the orifice of the suction plate 13 is introduced. 14 is sucked.

According to this, since the outside air introducing duct 27 is connected to the filter chamber 6 and the outside air is introduced through the filter chamber 6, the outside air introducing duct 27 is used.
Since the outside air flowing in through the inside smoothly flows into the suction port 17 of the housing 4, it is possible to suppress a decrease in the amount of ventilation flowing through the outside air introducing duct 27. Therefore, the amount of outside air introduced can be increased. If it is not necessary to dispose the high performance filter 24 or to introduce the outside air, the filter chamber 6 and the connecting duct 53 connected to this chamber are not necessary, and in this case, the air conditioner 1 is a casing. It is composed of a body 4 and a makeup panel 5.

In the air conditioner having such a structure, the air in the room flows as shown by the solid line in FIG. 1 to cool and heat the room. That is, the indoor air discharged from the turbo fan 7 is discharged from the outer peripheral portion of the fan 7 by the centrifugal force of the fan 7, passes through the heat exchanger 10, undergoes heat exchange there, and then is discharged to the air outlet 18 of the housing 4. Outlet 2 of decorative panel 5
It is blown out into the room through 1.

However, a part of the indoor air discharged from the turbo fan 7 does not pass through the heat exchanger 10, and the top surface 4a of the housing 4 of the air conditioner and the hub 7 of the turbo fan 7 are not.
It may wrap around between a and a as shown by a dotted arrow (FIG. 1) to cause so-called “wind bypass”. This "wind bypass" causes noise in the air conditioner.

According to this embodiment, in order to prevent air from flowing between the top surface 4a of the housing 4 of the air conditioner and the hub 7a of the turbofan 7, the top surface 4a of the housing 4 and A ring-shaped baffle plate 100 as shown in FIG. 2 is interposed between the turbofan 7 and the hub 7a. This baffle plate 100 is formed by punching an iron plate,
Preferably, the upright portion 100a of the baffle plate 100 is arranged so as to be located within the rotation trajectory of the blade 7b fixed to the hub 7a of the turbofan 7. Incidentally, 7c is a shroud of the turbofan 7.

FIG. 3 shows the noise measurement data (48.3 dB) with the baffle 100, and FIG. 4 shows the noise measurement data (50.7 dB) without the baffle 100. As is clear from FIGS. 3 and 4, when the baffle plate 100 is provided, noise is reduced by about 2.4 dB as much as “wind bypass” is eliminated.

In short, according to this embodiment, the baffle plate 100 formed in a ring shape between the top surface 4a of the housing 4 and the hub 7a of the turbofan 7 as shown in FIG.
Is eliminated, the "wind bypass" is eliminated, and the noise caused by the discharge action of the turbofan 7 is reduced accordingly.

Although the present invention has been described based on the embodiment, it is obvious that the present invention is not limited to this. For example, the baffle plate 100 is not limited to the ring shape, and it is obvious that the baffle plate 100 may have any shape as long as it can prevent "wind bypass".

As another embodiment, a part of the indoor air discharged from the turbo fan 7 does not pass through the heat exchanger 10, and the fan nozzle 13a and the hub 7a of the turbo fan 7 are provided.
As shown by a dotted arrow (FIG. 1), the air may go around the suction port 40 of the fan 7 and cause so-called “wind entrainment”. This "wind entrainment" causes noise in the air conditioner.

According to this embodiment, in order to prevent air from entering the suction port 40 of the turbo fan 7 between the fan nozzle 13a of the suction plate 13 and the hub 7a of the turbo fan 7, the turbo fan 7 is prevented. Shroud 7c
As shown in FIG. 1, a ring-shaped outer peripheral tongue (hereinafter referred to as “baffle plate”) 13b extending in the circumferential direction is provided on the outer periphery of the. This baffle plate 13b is integrally molded (resin molded) with the suction plate 13, and is preferably the fan nozzle 13 described above.
It has a height h which is approximately equal to the height of a.

FIG. 5 shows noise measurement data (48.4 dB) with the baffle plate 13b, and FIG. 6 shows noise measurement data (49.6 dB) without the baffle plate 13b. As is clear from FIG. 5 and FIG. 6, when the baffle plate 13b is provided, noise is reduced by 1.2 dB as much as “wind entrainment” is eliminated.

In short, according to this embodiment, since the baffle plate 13b extending in the circumferential direction is provided on the outer circumference of the shroud 7c, the "wind entrainment" is reduced, and the suction action of the turbofan 7 is caused accordingly. The noise generated is reduced.

Although the present invention has been described based on the embodiment, it is obvious that the present invention is not limited to this. For example, the baffle plate 13b is formed integrally with the suction plate 13, but the baffle plate 13b is not limited to this, and it is obvious that any baffle plate 13b may be used as long as it can prevent "wind entrainment".

Although the above-described embodiment describes the ceiling-embedded air conditioner, the application of the present invention is not limited to the ceiling-embedded air conditioner.
It goes without saying that it can be applied to all blowers having a shroud.

Needless to say, if two baffles 13b and 100 are provided above and below the turbofan 7, a so-called synergistic effect can be obtained.

[0034]

As is apparent from the above description, according to the invention described in claims 1 to 3, since the baffle plate extending in the circumferential direction of the fan is provided on the outer periphery of the shroud of the blower fan, the so-called so-called The "wind entrainment" is reduced, and the noise due to the suction action of the blower fan can be reduced accordingly.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view around a blower fan.

FIG. 3 is noise measurement data when a baffle plate 100 is provided.

FIG. 4 is noise measurement data when the baffle plate 100 is not provided.

FIG. 5 is noise measurement data when a baffle plate 13b is provided.

FIG. 6 is noise data when the baffle plate 13b is not provided.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air conditioner 4 Housing 4a Top surface 5 Decorative panel 6 Filter chamber 7 Turbofan 7a Hub 13 Suction plate 13a Fan nozzle 13b, 100 Baffle plate 27 Outside air introduction duct

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazuhiro Hinata, 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Masazumi Makino 2-5, Keihan Hondori, Moriguchi City, Osaka Prefecture No. 5 Sanyo Electric Co., Ltd. (72) Inventor Kazuo Abe 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Inventor Yukito Nawata 2 Keihan Main Street, Moriguchi City, Osaka Prefecture 5-5-5 Sanyo Electric Co., Ltd. (72) Inventor Kazunobu Okawa 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A fan nozzle extending in the circumferential direction of the fan is exposed to the inner circumference of the shroud of the blower fan, and a baffle plate extending in the circumferential direction of the fan is extended to the outer circumference of the shroud. Blower device. 2. A fan nozzle extending in the circumferential direction of the fan is exposed to the inner circumference of the shroud of the blower fan, and a baffle plate extending in the circumferential direction of the fan is extended to the outer circumference of the shroud. An air blower characterized by being integrally molded with a fan nozzle. 3. A blower fan is fixed to a top surface of a casing of an air conditioner, a heat exchanger is arranged around the blower fan, and air sucked by the blower fan is directed toward the heat exchanger. In a ceiling-embedded air conditioner for discharging, a fan nozzle extending in the circumferential direction of the fan faces the inner circumference of the shroud of the blower fan, and a baffle plate extending in the circumferential direction of the fan extends on the outer circumference of the shroud. A ceiling-embedded air conditioner characterized by being installed. 4. A blower fan is fixed to a top surface of a casing of an air conditioner, a heat exchanger is arranged around the blower fan, and air sucked by the blower fan is directed toward the heat exchanger. In a ceiling-embedded air conditioner for discharging, a fan nozzle extending in the circumferential direction of the fan faces the inner circumference of the shroud of the blower fan, and a baffle plate extending in the circumferential direction of the fan extends on the outer circumference of the shroud. Let
The ceiling-embedded air conditioner in which the baffle plate and the fan nozzle are integrally formed.