JPH1047704A - Air conditioning indoor machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce operation noise of an air conditioning indoor machine. SOLUTION: A centrifugal fan 15 is disposed at the left of a first chamber 11 extending horizontally, and a coil 16 is disposed at the right of the first chamber 11. A silencing chamber 13 is provided between a second chamber 12 for containing an air filter 17 and the foreging first chamber 11, and a flow passage cross sectional area of the silencing chamber 3 is set to be smaller than those of the first and second chambers 11 and 12. Air sucked in from an air inlet 35 of the second chamber 12 with the operation of the fan 15 passes in succession through the air filter 17, silencing chamber 13, coil 16, and fan 15, and is exhausted from an air outlet 31 of the first chamber 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning indoor unit suitable for being installed in a ceiling.

[0002]

2. Description of the Related Art Conventionally, this type of indoor unit for air conditioning includes:
There is one configured as follows. That is, a centrifugal fan and a coil are arranged at a predetermined interval in a case extending in the horizontal direction, an air filter is directly opposed to the coil, and the air outside the case is caused to flow to the air filter by the operation of the fan. It is configured such that the coil and the fan pass through in order.

[0003]

The above-mentioned conventional air-conditioning indoor unit is excellent in that the components are arranged in a horizontal direction, so that the height is reduced and the unit can be easily installed in the ceiling. Since the sound passes straight through the coil and the air filter and is emitted to the outside of the case, there has been a problem that the operating noise is large. An object of the present invention is to reduce operating noise of an indoor unit for air conditioning.

[0004]

In order to achieve the above-mentioned object, the present invention comprises an air-conditioning indoor unit as shown in FIGS. 1 and 2, for example. A centrifugal fan 15 and a coil 16 are arranged at a predetermined interval in a first chamber 11 extending in the horizontal direction, and a muffling chamber is provided between the second chamber 12 containing an air filter 17 and the first chamber 11. The first chamber 11, the muffling chamber 13, and the second chamber 12 are communicated with each other in the horizontal direction, and the air sucked from the air inlet 35 of the second chamber 12 by the operation of the fan 15 is filtered by the air filter. 17, the silencing chamber 13, the coil 16, and the fan 15, in order, so that the air can be discharged to the air outlet 31 of the first chamber 11. The value was set to a value smaller than the cross-sectional area of each channel of the chamber 11 and the second chamber 12.

[0005]

The present invention operates as follows, for example, as shown in FIGS. The suction noise of the centrifugal fan 15
The air passes through the coil 16 of the chamber 11, the muffling chamber 13, and the air filter 17 of the second chamber 12 in order, and is released to the outside from the air inlet 35. Energy is reduced by the contraction effect when propagating to the sound deadening chamber 13 having a small channel cross-sectional area,
The energy is also reduced by the expansion effect when propagating from the silencing chamber 13 to the second chamber 12 having a large channel cross-sectional area.

When the guide member 24 for guiding the air passing through the coil 16 to the suction port 15a of the fan 15 is provided in the above-described configuration, the air flow from the coil 16 to the suction port 15a is provided. And the flow noise is reduced, and the discharge pressure of the fan 16 is increased by about 10%.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
FIG. FIG. 1 is a schematic view of the indoor unit for air conditioning as viewed in a longitudinal section. FIG. 2 is a plan view of the indoor unit.

As shown in FIG. 1, an air-conditioning indoor unit 2 is arranged in a ceiling space S above a ceiling 1, and the indoor unit 2 is hung from a slab 4 by a plurality of hanging members 3.
The indoor unit 2 includes a first case 6 and a second case 7 extending in the horizontal direction, and a short silencing case 8 disposed between the two cases 6.7. Reference numeral 9 denotes a drain pan. A centrifugal fan 15 is arranged on the left part of the first chamber 11 in the internal space of the first case 6, and a coil 16 is arranged on the right part of the first chamber 11 above.

An air filter 17 is accommodated in the second chamber 12 in the internal space of the second case 7. The cross-sectional area of the flow passage of the silencing chamber 13 formed in the internal space of the silencing case 8 is set to a value smaller than the cross-sectional area of each of the flow passages of the first chamber 11 and the second chamber 12. Then, the first chamber 11, the muffling chamber 13, and the second chamber 12 are sequentially communicated in the horizontal direction.

The fan 15 is formed in a double suction type, and is arranged such that the suction ports 15a and 15a are located at the lower part in the first chamber 11, and the discharge ports 15b are located at the upper part. Is done. An electric motor 20 is connected to a rotation shaft 15c of the fan 15. Reference numeral 21 denotes a bracket. A heating medium such as hot water or cold water is supplied to the coil 16 from an outdoor unit (not shown).

The inner surface of the top wall 11a of the first chamber 11 and the left side wall 1
A sound absorbing material (not shown) is mounted on the inner surface of 1b. A guide member 24 for guiding the air passing through the coil 16 to the suction ports 15a of the fan 15 projects downward from the top wall 11a.
The sound absorbing material 25 is also mounted. Furthermore, the above-mentioned silencer 1
The sound absorbing material 27 is also attached to the entire inner wall surface of the third. In addition,
Each sound absorbing material described above is made of glass wool or the like.

An air outlet 31 of the first chamber 11 is constituted by the discharge port 15 b of the fan 15, and the air outlet 31 and an air supply port 32 of the ceiling 1 are connected by an air supply duct 33. Further, an air inlet 35 opened on the right side of the second chamber 12 and a return air port 36 of the ceiling 1 are connected by a return air duct 37.

When the centrifugal fan 15 is operated, the air in the room R is returned to the return air duct 37 and the air inlet 3 of the second room 12.
5. Air filter 17 / muffler chamber 13 / coil 16 / fan 15 / air outlet 31 of first chamber 11 / air supply duct 33

The above embodiment can be modified as follows. The centrifugal fan 15 may be upside down from the arrangement of FIG. More specifically, the suction ports 15a, 15a of the fan 15 are located at the upper part in the first chamber 11, and the discharge ports 15b are located at the lower part. In this case, the guide member 2 for guiding the air that has passed through the coil 16 to the suction ports 15a.
4 projects upward from the bottom wall 11c of the first chamber 11
(Not shown).

The above-mentioned centrifugal fan 15 may be of a single suction type. The guide member 24 may be arranged obliquely instead of being arranged vertically. The first case 6, the second case 7, and the muffling case 8 described above.
The three cases described above may be formed by integrally forming two adjacent cases or by integrally forming three cases, instead of being formed separately. The air inlet 35 is only required to take air into the second chamber 12, and may be, for example, an opening in the ceiling space S.

[0016]

The present invention has the following effects because it is constructed and operates as described above. (Invention of claim 1) The invention of claim 1 has the following effects.
Since the sound deadening chamber was provided between the first chamber and the second chamber, and the flow path cross-sectional area of the sound deadening chamber was set to a value smaller than each flow path cross-sectional area of the above-described first chamber and the second chamber, The suction noise of the centrifugal fan is reduced by the contraction / expansion action when the sound propagates from the first chamber through the sound deadening chamber to the second chamber. For this reason, the fan suction noise emitted from the air inlet of the second chamber is reduced, and the operation noise of the indoor unit can be reduced.

(Invention of Claim 2) According to the invention of Claim 2, since the sound absorbing material is mounted on the inner wall surface of the sound deadening chamber, the suction sound of the centrifugal fan can be absorbed while passing through the sound deadening chamber,
The operation noise of the indoor unit can be further reduced.

According to the third aspect of the present invention, since the air passing through the coil can be smoothly guided to the suction port of the fan by the guide member, the flow noise from the coil to the suction port can be improved. And the discharge pressure of the fan increases.

(Invention of claim 4) The invention of claim 4 also has basically the same effect as the above-mentioned invention of claim 3. That is, since the air passing through the coil can be smoothly guided to the suction port of the fan by the guide member, the flow noise from the coil to the suction port can be reduced, and the discharge pressure of the fan increases.

(Invention of claim 5) According to the invention of claim 5, since the sound absorbing material is attached to the guide member, the flow noise described above can be absorbed and the operation noise of the indoor unit can be further reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of an indoor unit for air conditioning according to the present invention as viewed in a longitudinal section.

FIG. 2 is a plan view of the indoor unit.

[Explanation of symbols]

11 ... first room, 11a ... top wall of first room 11, 11c ... bottom wall of first room 11, 12 ... second room, 13 ... sound deadening room, 15 ...
Centrifugal fan, 15a ... Suction port of centrifugal fan 15, 16
... Coil, 17 ... Air filter, 24 ... Guide member, 2
5 ... Sound absorbing material, 27 ... Sound absorbing material, 31 ... Air outlet of the first chamber 11, 35 ... Air inlet of the second chamber 12.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Sakane 1-4-5 Minamimorimachi, Kita-ku, Osaka-shi Shinko Industries Co., Ltd. (72) Minoru Onoe 1-4-5 Minamimoricho, Kita-ku, Osaka-shi Shinko Kogyo Co., Ltd. (72) Inventor Shoji Funaki 1-4-5 Minamimori-cho, Kita-ku, Osaka City Shinko Kogyo Co., Ltd. (72) Inventor 1-4-5 Minamimori-cho, Kita-ku, Osaka City No. Shinko Industry Co., Ltd.

Claims (5)

[Claims] 1. A centrifugal fan (15) and a coil (16) are arranged at a predetermined interval in a first chamber (11) extending in a horizontal direction, and a second chamber (11) accommodating an air filter (17) is provided. A silencing chamber (13) is provided between the first chamber (12) and the first chamber (11), and the first chamber (11), the silencing chamber (13), and the second chamber (12) communicate with each other in the horizontal direction. And by operating the fan (15),
The air sucked from the air inlet (35) of the second chamber (12) is passed through the air filter (17), the sound deadening chamber (13), the coil (16) and the fan (15) in this order, and the first air is sucked. Room (1
The air outlet (31) of (1) is configured to be capable of discharging air, and the flow passage cross-sectional area of the silencing chamber (13) is set to be equal to the first chamber (11) and the second chamber
(12) The air conditioner indoor unit, wherein the value is set to a value smaller than the cross-sectional area of each flow path. 2. The air conditioner indoor unit according to claim 1, wherein a sound absorbing material (27) is attached to an inner wall surface of the sound deadening room (13). 3. The air conditioner indoor unit according to claim 1, wherein the suction port (15a) of the centrifugal fan (15) is located at a lower part in the first chamber (11). A guide member for guiding the air passing through the coil (16) to the suction port (15a),
(24) The air conditioner indoor unit characterized in that it is configured to protrude downward from the top wall (11a) of the first chamber (11). 4. The air-conditioning indoor unit according to claim 1, wherein the suction port (15a) of the centrifugal fan (15) is located at an upper part in the first chamber (11). A guide member for guiding the air passing through the coil (16) to the suction port (15a),
(24) The indoor unit for air conditioning, wherein the indoor unit is configured to protrude upward from a bottom wall (11c) of the first chamber (11). 5. The air conditioner indoor unit according to claim 3, wherein a sound absorbing material (25) is attached to the guide member (24).