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EP0789196B1 - Air conditioner having eccentrically-disposed fan - Google Patents

Air conditioner having eccentrically-disposed fan Download PDF

Info

Publication number
EP0789196B1
EP0789196B1 EP96114731A EP96114731A EP0789196B1 EP 0789196 B1 EP0789196 B1 EP 0789196B1 EP 96114731 A EP96114731 A EP 96114731A EP 96114731 A EP96114731 A EP 96114731A EP 0789196 B1 EP0789196 B1 EP 0789196B1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
fan
air conditioner
air
center
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96114731A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0789196A2 (en
EP0789196A3 (en
Inventor
Syouichi Suda
Kazuo Abe
Kazuhiro Hiugano
Masazumi Makino
Kazunobu Okawa
Yukito Nawata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Publication of EP0789196A2 publication Critical patent/EP0789196A2/en
Publication of EP0789196A3 publication Critical patent/EP0789196A3/en
Application granted granted Critical
Publication of EP0789196B1 publication Critical patent/EP0789196B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0022—Centrifugal or radial fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0047—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0067—Indoor units, e.g. fan coil units characterised by heat exchangers by the shape of the heat exchangers or of parts thereof, e.g. of their fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0071—Indoor units, e.g. fan coil units with means for purifying supplied air
    • F24F1/0073—Indoor units, e.g. fan coil units with means for purifying supplied air characterised by the mounting or arrangement of filters

Definitions

  • the present invention relates to an air conditioner which is embedded and mounted in a ceiling, for example.
  • Fig. 1 shows a conventional air conditioner which is embedded and mounted in a ceiling (hereinafter referred to as "in-ceiling mount type air conditioner”).
  • the air conditioner has a housing (hereinafter referred to as “unit body") 1, a fan 2 and a heat exchanger 3 which is formed in a substantially square shape so as to surround the fan 2.
  • the fan 2 and the heat exchanger 3 are accommodated in the housing 1, and pipe holding plates 4 of the heat exchanger 3 are connected to each other through a partition plate 5.
  • a drain pump 7 is further disposed in a space 6 which is spatially separated from the inside of the heat exchanger 3 by the partition plate 5.
  • the air becomes turbulent or eddy when it is blown out from the fan 2, and the turbulence or eddy of the blow-out air causes noises during the operation of the air conditioner.
  • US-A-4,313,493 describes an air conditioner with a fan and a heat exchanger being bent so as to surround the fan in a casing.
  • An inducing casing is surrounding the fan so that air is suched from three sides and blown out to the other side of the heat exchanger.
  • an object of the present invention is to provide an air conditioner which can reduce noises under the operation of the air conditioner (hereinafter referred to as "operation noise").
  • an air conditioner which contains a fan and a heat exchanger in a housing, the heat exchanger being bent so as to surround the fan, is characterized in that the shaft center of the fan is disposed eccentrically from the center of the heat exchanger (i.e., is displaced from the center of the heat exchanger in any direction).
  • an air conditioner which contains a fan and a heat exchanger in a housing, the heat exchanger being bent so as to surround the fan, and pipe holding plates of the heat exchanger being connected to each other through a partition plate, is characterized in that the shaft center of the fan is disposed eccentrically from the center of the heat exchanger toward the partition plate.
  • the shaft center of the fan is disposed eccentrically from the center of the heat exchanger, or the shaft center of the fan is disposed eccentrically from the center of the heat exchanger toward the partition plate side. Therefore, the turbulence of the air is suppressed, so that the operation noise can be reduced.
  • Fig. 2 is a bottom view showing an unit body of an air conditioner according to the present invention
  • Fig. 3 is a bottom view showing the unit body to which a decorative panel is attached
  • Fig. 4 is a cross-sectional view showing the unit body of Fig. 3 and the decorative panel.
  • reference numeral 10 represents an in-ceiling mount type air conditioner.
  • This in-ceiling mount type air conditioner is fixed while suspended in a ceiling space 11 of a house or building 40, and it is of a four-direction air blowing type.
  • the air conditioner has an unit body 22 and a decorative panel 14.
  • An air suction port (not shown) is formed at the center of the longitudinal direction of the decorative panel 14, and blow-out ports 18 are formed around the air suction port of the decorative panel 14 as shown in Fig. 3.
  • Four bolts 42 are fixed to roof frames of the house 40 or the like so as to extend from the house 40 vertically downwardly, and are also fixed to hanging hooks of the unit body 22 to secure the air conditioner.
  • a fan motor 24, a turbo fan 26, a heat exchanger 38 and an electrical equipment box 36 In the unit body 22 of the air conditioner 10 are disposed a fan motor 24, a turbo fan 26, a heat exchanger 38 and an electrical equipment box 36.
  • Reference numeral 16 represents an air suction port of the turbo fan 26.
  • the heat exchanger 38 is bent in a substantially rectangular shape so as to surround the fan motor 24 and the turbo fan 26.
  • the pipe holding plates 49 of the heat exchanger 38 are connected through a partition plate 28.
  • a drain pump 30, a drain exhaust port 32, a refrigerant pipe 34, etc. are disposed in a space at the outside of the heat exchanger 38 which is spatially separated from the inside of the heat exchanger 38 by the partition plate 28.
  • the partition plate 28 is used to prevent the sucked air from leaking out during the operation of the air conditioner, and thus allows the heat-exchanged air to be surely blow out from the four-direction air blow-out ports 18 into a room R.
  • the heat exchanger 38 is bent in a substantially rectangular shape, and located to surround the turbo fan 26 as shown in Fig. 2.
  • the shaft center of the turbo fan 26 is eccentrically displaced from the center of the heat exchanger 38 toward the partition plate (i.e., the turbo fan 26 is disposed eccentrically from the center of the heat exchanger 38 toward the partition plate 28).
  • the shaft center of the turbo fan 26 means the axial center of the output shaft of the fan motor 24, and the center of the heat exchanger 38 means the intersection point between lines L1 and L2, that is, the intersection point between a longitudinal axis L1 and a lateral axis L2.
  • an air filter 20 is also provided at the air suction port of the decorative panel 14 of the air conditioner 10.
  • the turbo fan 26 upon actuation of the fan motor 24 in a body casing 22, the turbo fan 26 is rotated to suck air from the room R through the air suction port of the decorative panel and the air suction port 16 of the turbo fan 26.
  • the sucked air is cleaned by the air filter 20, and then fed to the heat exchanger 38.
  • the air is subjected to the heat exchange by the heat exchanger 38, and then blown out from the four blow-out ports into the room Rn in the four directions.
  • the room air which has been sucked from the air suction port 16 and heat-exchanged by the heat exchanger 38 is prevented from leaking from the inside of the heat exchanger 38 to the surrounding portions of the drain pump 30, the drain exhaust port 32, the in-door mechanical valve 60, etc. due to existence of the partition plate 28 located at a corner portion of the unit body 22, and thus the heat-exchanged air is allowed to be surely blow out from the four-direction blow-out ports 18 into the room R.
  • the shaft center of the turbo fan 26 is eccentrically displaced from the center of the heat exchanger 38 (i.e., the center of the area surrounded by the rectangular heat exchanger 38) toward the partition plate 28 side by a distance of L3 as shown in Fig. 2, so that the operation noise during the operation of the air conditioner can be more greatly reduced as compared with the conventional air conditioner, which will be described later.
  • the distance L3 is preferably equal to about 100mm, however, it may be varied in accordance with the size of the unit body 22. Further, it has been found out that the distance L3 is not dependent on the bending shape of the heat exchanger 38.
  • the heat exchanger 38 may be bent in a square, rectangular, elliptic or circular shape.
  • the displacement direction of the shaft center of the turbo fan 26 is not limited to a specific one. In the embodiment shown in Fig.
  • the shaft center of the turbo fan 26 is displaced from the center of the heat exchanger 38 toward the partition plate side (in the case of Figs. 2 and 3, in a direction along the longitudinal axis L1 which approaches to one short side of the heat exchanger 38 nearer to the partition plate 28).
  • This displacement direction is merely determined as a preferable one to reduce the operation noise, and it may be set to any direction, for example, the opposite direction to the above displacement direction (i.e., the direction opposite to the partition plate side).
  • the latter case i.e., the displacement in the opposite direction to the partition plate side
  • the eddy or turbulence of air which is blown out from the turbo fan 26 to the heat exchanger 38 can be reduced, so that the noises during the operation of the air conditioner can be more reduced as compared with the conventional air conditioner.
  • Fig. 5 is a graph showing noise test data obtained according to the present invention
  • Fig. 6 is a graph showing noise test data obtained according to the prior art.
  • the abscissa represents the frequency while the ordinate represents the magnitude of noises (dB).
  • the frequency band used for the noise test data was 25Hz to 20KHz
  • the histogram at the right end of each graph represents an average value in the used frequency band. Comparing these test data of Figs. 5 and 6, it is apparent from Figs. 5 and 6 that the air conditioner of the present invention can more greatly reduce the operation noise by about 2 dB as compared with the conventional air conditioner. That is, in the case of Fig. 5, the operation noise is reduced to 48.3dB whereas in the case of Fig. 6, the operation noise is equal to 50.3dB.
  • the present invention is not limited to the above embodiment, and various modifications may be made without departing from the subject matter of the present invention.
  • the above-mentioned embodiment relates to a four-direction air blow-out type air conditioner 10, however, the present invention is applicable to any other type air conditioners, such as a two-direction air blow-out type air conditioner or the like.
  • the heat exchanger is bent so as to surround the fan, and the shaft center of the fan is eccentrically displaced from the center of the heat exchanger or displaced from the center of the heat exchanger toward the partition plate side. Therefore, the turbulence or eddy of the air which is blow out from the fan can be suppressed, so that the operation noise can be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
EP96114731A 1995-09-22 1996-09-13 Air conditioner having eccentrically-disposed fan Expired - Lifetime EP0789196B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP269532/95 1995-09-22
JP26953295A JP3506400B2 (ja) 1995-09-22 1995-09-22 空気調和機
JP26953295 1995-09-22

Publications (3)

Publication Number Publication Date
EP0789196A2 EP0789196A2 (en) 1997-08-13
EP0789196A3 EP0789196A3 (en) 1998-07-22
EP0789196B1 true EP0789196B1 (en) 2003-12-17

Family

ID=17473704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96114731A Expired - Lifetime EP0789196B1 (en) 1995-09-22 1996-09-13 Air conditioner having eccentrically-disposed fan

Country Status (6)

Country Link
EP (1) EP0789196B1 (pt)
JP (1) JP3506400B2 (pt)
CN (1) CN1146705C (pt)
DE (1) DE69631114T2 (pt)
ES (1) ES2211926T3 (pt)
PT (1) PT789196E (pt)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0926451B1 (en) * 1997-12-24 2003-09-03 Carrier Corporation Ceiling mounted apparatus for heating and cooling
JP2000046360A (ja) * 1998-07-29 2000-02-18 Hitachi Ltd 天井埋込形の室内機
EP1589292A1 (en) * 2004-04-23 2005-10-26 Unico Consumer Products Co., Ltd. Ceiling-recessed air treatment apparatus
JP5036484B2 (ja) * 2007-10-23 2012-09-26 東芝キヤリア株式会社 天井埋込形空気調和機
CN107076432A (zh) * 2015-01-22 2017-08-18 三菱电机株式会社 室内机及制冷循环装置
CN113739262A (zh) * 2021-09-30 2021-12-03 广东美的暖通设备有限公司 空调用换热器密封板、室内机和空调

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313493A (en) * 1976-12-13 1982-02-02 Tokyo Gas Co. Ltd. Forced air unit
DE29504424U1 (de) * 1995-03-15 1995-05-18 GEA Happel Klimatechnik GmbH, 44625 Herne Deckenlüfter
JP3593418B2 (ja) * 1996-07-03 2004-11-24 東芝キヤリア株式会社 天井カセット形空気調和機

Also Published As

Publication number Publication date
DE69631114D1 (de) 2004-01-29
CN1146705C (zh) 2004-04-21
ES2211926T3 (es) 2004-07-16
CN1151498A (zh) 1997-06-11
PT789196E (pt) 2004-04-30
DE69631114T2 (de) 2004-09-02
EP0789196A2 (en) 1997-08-13
JPH0989362A (ja) 1997-04-04
EP0789196A3 (en) 1998-07-22
JP3506400B2 (ja) 2004-03-15

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