EP3748238A1 - Climatiseur intégré au plafond - Google Patents

Climatiseur intégré au plafond Download PDF

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Publication number
EP3748238A1
EP3748238A1 EP18904199.9A EP18904199A EP3748238A1 EP 3748238 A1 EP3748238 A1 EP 3748238A1 EP 18904199 A EP18904199 A EP 18904199A EP 3748238 A1 EP3748238 A1 EP 3748238A1
Authority
EP
European Patent Office
Prior art keywords
shroud
heat exchanger
gap
end portion
blower
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.)
Granted
Application number
EP18904199.9A
Other languages
German (de)
English (en)
Other versions
EP3748238C0 (fr
EP3748238B1 (fr
EP3748238A4 (fr
Inventor
Masakazu Ito
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.)
Mitsubishi Heavy Industries Thermal Systems Ltd
Original Assignee
Mitsubishi Heavy Industries Thermal Systems 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 Mitsubishi Heavy Industries Thermal Systems Ltd filed Critical Mitsubishi Heavy Industries Thermal Systems Ltd
Publication of EP3748238A1 publication Critical patent/EP3748238A1/fr
Publication of EP3748238A4 publication Critical patent/EP3748238A4/fr
Application granted granted Critical
Publication of EP3748238C0 publication Critical patent/EP3748238C0/fr
Publication of EP3748238B1 publication Critical patent/EP3748238B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • 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
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate

Definitions

  • the present invention relates to a ceiling-cassette air conditioner.
  • An indoor unit of a ceiling-cassette air conditioner is internally provided with a centrifugal blower, and a lower surface of the indoor unit has a bell mouth having an opening. A diameter of the opening decreases upward and inward from a suction port.
  • a drain pan for receiving water condensed and dropped on a surface of a heat exchanger during a cooling operation is installed inside the indoor unit.
  • the centrifugal blower has an impeller connected to a rotary shaft.
  • the impeller includes a hub (main plate) installed on an upper portion of the impeller and connected to the rotary shaft, a plurality of blades in which one end side is connected to the hub and the other end side is connected to a shroud, and the shroud that connects the other ends of the blades to each other and whose diameter increases upward and outward from the bell mouth side.
  • PTL 1 below discloses that the shroud is installed to be relatively rotatable inside a suction-side end portion of the shroud to maintain a predetermined gap (L1) between the shroud and the bell mouth.
  • An upper end portion of a bell mouth is accommodated inside a suction-side end portion of a shroud, and a gap is disposed between the shroud and the bell mouth.
  • a drain pan has two side walls (wall portions) to face each of an inside and an outside of a heat exchanger in order to form a drain groove for receiving drain water.
  • a discharge-side end portion of the shroud is located above an inner peripheral wall portion installed inside the heat exchanger in the drain groove, and a gap is disposed between the drain groove and the shroud.
  • a suction side of the shroud has a gap from the bell mouth, and a discharge side of the shroud has a gap from the inner peripheral wall portion of the drain groove.
  • the inventor has found a fact as follows. If air suctioned by a blower bypasses the blade side without passing through a blade side with respect to the shroud, and passes through the gap between the bell mouth and the shroud, the air causes noise. In addition, the inventor has found another fact as follows. In a case where the air discharged from the blower enters the gap between the shroud and the inner peripheral wall portion of the drain groove, and the air is stagnant or an airflow is separated on a lower side of the shroud, the air also causes the noise.
  • the present invention is made in view of the above-described circumstances, and an object thereof is to provide a ceiling-cassette air conditioner capable of reducing noise generated by air suctioned or air discharged by a blower.
  • a ceiling-cassette air conditioner including a heat exchanger, a blower having a tubular shroud having a diameter which increases upward and outward, and installed inside the heat exchanger, a bell mouth installed below the shroud and on a suction side of the blower, and a drain pan having a concave drain groove which accommodates a lower portion of the heat exchanger.
  • a ratio of a second gap B between a discharge-side end portion of the shroud and a side wall of the drain groove inside the heat exchanger with respect to a first gap A between an upper end portion of the bell mouth and a suction-side end portion of the shroud is B/A ⁇ 3 or 10 ⁇ B/A.
  • a height of the side wall of the drain groove inside the heat exchanger may be higher than a side wall of the drain groove outside the heat exchanger.
  • the ceiling-cassette air conditioner (hereinafter, referred to as an "air conditioner”) includes an indoor unit 1, an outdoor unit (not illustrated), and a refrigerant pipe (not illustrated) that connects the indoor unit 1 and the outdoor unit to each other.
  • the indoor unit 1 is installed so that a case body 2 is cassette in a ceiling. As illustrated in Fig. 2 , the case body 2 is internally equipped with a heat exchanger 7, a drain pan 10, a motor 5, a blower 6, and a bell mouth 12. A ceiling panel 8 exposed on a ceiling surface is mounted on a lower portion of the case body 2.
  • Fig. 1 is a bottom view when the indoor unit 1 is viewed from an indoor side, that is, when the indoor unit 1 is viewed from a lower surface of the indoor unit 1.
  • Fig. 2 is a longitudinal sectional view taken along line II-II in Fig. 1 .
  • the blower 6 is a centrifugal blower, and has an impeller 22 connected to a rotary shaft 21.
  • the impeller 22 includes a hub (main plate) 23 installed in an upper portion of the impeller 22 and connected to the rotary shaft 21, a plurality of blades 24 in which one end side is connected to the hub 23 and the other end side is connected to a shroud 25, and the shroud 25 that connects the other ends of the blades 24 to each other and whose diameter increases upward and outward from the bell mouth 12 side.
  • the shroud 25 has a tubular shape.
  • a radius of a lower portion is larger than a radius of an upper portion, and the radius gradually increases from the lower portion to the upper portion.
  • a suction-side end portion of the shroud 25, that is, a lower end portion is located on an outer peripheral side of the bell mouth 12, and has a gap from the bell mouth 12.
  • a discharge-side end portion of the shroud 25, that is, an upper end portion is located above an inner peripheral wall portion 18a of a drain groove 18, and has a gap from the inner peripheral wall portion 18a.
  • the bell mouth 12 is a tubular member, and is installed below the shroud 25 and on a suction side of the blower 6.
  • a radius of a lower portion is smaller than a radius of an upper portion, and the radius gradually decreases from the lower portion to the upper portion.
  • An upper end portion of the bell mouth 12 is accommodated inside the suction-side end portion of the shroud 25.
  • the drain pan 10 is disposed in a lower portion of the heat exchanger 7, and receives drain water dropped from the heat exchanger 7.
  • the bell mouth 12 is disposed in a lower portion of the drain pan 10.
  • a suction port 3 is formed in a central portion on a lower surface of the indoor unit 1, and a discharge port 4 is formed adjacent to the suction port 3 and along an outer peripheral portion on the lower surface of the indoor unit 1.
  • a suction grill 11 and a filter 13 disposed above the suction grill 11 are installed in the suction port 3.
  • the drain pan 10 is made of styrene foam, and a surface for storing the drain water is coated with a waterproof paint.
  • a shape of the drain pan 10 in a plan view is a substantially quadrangular shape. Openings 16 and 17 are formed in the drain pan 10 to correspond to the suction port 3 and the discharge port 4.
  • a bottom portion 10a of the drain pan 10 is disposed over an entire region having the heat exchanger 7 installed therein, along a lower portion of the heat exchanger 7 disposed to surround the blower 6.
  • Fig. 3 is a plan view illustrating the drain pan 10.
  • a concave drain groove 18 is formed in the drain pan 10, and the drain water is accumulated inside the drain groove 18.
  • the drain groove 18 has an inner peripheral wall portion 18a formed inside the heat exchanger 7, that is, on an inlet side of the heat exchanger 7, and an outer peripheral wall portion 18b formed outside the heat exchanger 7, that is, on an outlet side of the heat exchanger 7.
  • the inner peripheral wall portion 18a is disposed along the opening 16 formed corresponding to the suction port 3.
  • the outer peripheral wall portion 18b is disposed along the opening 17 formed corresponding to the discharge port 4.
  • the lower portion of the heat exchanger 7 is accommodated in the drain groove 18, and a height position of a lower end of the heat exchanger 7 is lower than an upper end of the drain groove 18.
  • the outer peripheral wall portion 18b of the drain groove 18 prevents the drain water adhering to the lower portion of the heat exchanger 7 from being scattered outward.
  • a convex portion 19 protruding upward is formed in the bottom portion 10a of the drain pan 10.
  • the heat exchanger 7 is placed on an upper surface of the convex portion 19.
  • the convex portion 19 is formed corresponding to a shape of a bottom surface of the heat exchanger 7 along the bottom surface of the heat exchanger 7 so that a gap from the heat exchanger 7 is not formed as far as possible.
  • the bottom portion 10a of the above-described drain pan 10 is formed at a lower position than the bottom portion 10a inside the heat exchanger 7. In this manner, the water accumulated in the drain pan 10 is easily guided outward from the inside of the heat exchanger 7.
  • the blower 6 is disposed inside the heat exchanger 7. A wind flow from the blower 6 is oriented outward from the inside of the heat exchanger 7. Accordingly, the drain water accumulated in the drain pan 10 is easily discharged outward from the inside of the heat exchanger 7 by using a wind force.
  • an insulation 20 is installed between a lower portion of the heat exchanger 7 and an upper surface of the convex portion 19. In this manner, a space between the heat exchanger 7 and the convex portion 19 is closed by the insulation 20. Accordingly, it is possible to reduce the air flowing outward from the inside of the heat exchanger 7 after passing through a gap without passing through the heat exchanger 7.
  • the insulation 20 is installed between the lower portion of the heat exchanger 7 and the upper surface of the convex portion 19, the insulation 20 is accommodated in the drain groove 18. Therefore, even the drain water dropped from the heat exchanger 7 and adhering to the insulation 20 is prevented from being scattered outward.
  • a ratio of the second gap B between the discharge-side end portion of the shroud 25 and the inner peripheral wall portion 18a of the drain groove 18 with respect to the first gap A between the upper end portion of the bell mouth 12 and the suction-side end portion of the shroud 25 is B/A ⁇ 3 or 10 ⁇ B/A.
  • Fig. 5 is a graph illustrating a relationship between a sound pressure level (dB) of the sound generated by the air flow and B/A.
  • the inventor obtains the following result.
  • the sound pressure level is reduced, compared to a case of 3 ⁇ B/A ⁇ 10.
  • the sound having a frequency of approximately 1 kHz is particularly reduced.
  • the height of the inner peripheral wall portion 18a is higher than the height of the outer peripheral wall portion 18b. In this manner, it is possible to shorten a distance between the discharge-side end portion of the shroud 25 and the upper end portion of the inner peripheral wall portion 18a. As illustrated in Fig. 5 , it is desirable that 1 ⁇ B/A is satisfied, in view of the following facts. In a case of B/A ⁇ 1, compared to a case of 1 ⁇ B/A ⁇ 3, the sound pressure level becomes higher, and the contact caused by the vibration of the bell mouth 12 and the shroud 25 is avoided.
  • the second gap B between the discharge-side end portion of the shroud 25 and the inner peripheral wall portion 18a of the drain groove 18 is relatively widened.
  • the air is less likely to stagnate on the lower side of the shroud 25, and the airflow is less likely to be separated. Therefore, compared to a case of 3 ⁇ B/A ⁇ 10, the air flows on the lower side of the shroud 25, and the airflow is less likely to be separated. Accordingly, the noise is reduced. As illustrated in Fig. 5 , it is found that the sound pressure level is reduced in a range of 10 ⁇ B/A ⁇ 20.
  • the ratio of the second gap B between the discharge-side end portion of the shroud 25 and the inner peripheral wall portion 18a of the drain groove 18 with respect to the first gap A between the upper end portion of the bell mouth 12 and the suction-side end portion of the shroud 25 is B/A ⁇ 3 or 10 ⁇ B/A.
  • the noise is reduced, compared to a case of 3 ⁇ B/A ⁇ 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP18904199.9A 2018-01-30 2018-11-08 Climatiseur intégré au plafond Active EP3748238B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018013680A JP7278710B2 (ja) 2018-01-30 2018-01-30 天井埋込み型空気調和機
PCT/JP2018/041452 WO2019150691A1 (fr) 2018-01-30 2018-11-08 Climatiseur intégré au plafond

Publications (4)

Publication Number Publication Date
EP3748238A1 true EP3748238A1 (fr) 2020-12-09
EP3748238A4 EP3748238A4 (fr) 2021-10-20
EP3748238C0 EP3748238C0 (fr) 2025-12-31
EP3748238B1 EP3748238B1 (fr) 2025-12-31

Family

ID=67478745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18904199.9A Active EP3748238B1 (fr) 2018-01-30 2018-11-08 Climatiseur intégré au plafond

Country Status (5)

Country Link
EP (1) EP3748238B1 (fr)
JP (1) JP7278710B2 (fr)
CN (1) CN212746683U (fr)
ES (1) ES3058506T3 (fr)
WO (1) WO2019150691A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113932305A (zh) * 2021-11-02 2022-01-14 珠海格力电器股份有限公司 一种吊顶式空调室内机及吊顶式空调器

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11101194A (ja) * 1997-09-30 1999-04-13 Daikin Ind Ltd 遠心送風機及び該遠心送風機を備えた空気調和機
JP3807101B2 (ja) * 1998-06-19 2006-08-09 株式会社富士通ゼネラル 天井埋込型空気調和機
JP2002235930A (ja) 2001-02-09 2002-08-23 Daikin Ind Ltd 空気調和機
US7614250B2 (en) * 2002-12-16 2009-11-10 Daikin Industries, Ltd. Centrifugal fan with air guide
EP1589292A1 (fr) * 2004-04-23 2005-10-26 Unico Consumer Products Co., Ltd. Appareil de traitement de l'air encastrés dans un plafond
KR100782195B1 (ko) * 2006-08-10 2007-12-04 엘지전자 주식회사 공기 조화기
EP2023049B1 (fr) * 2007-07-25 2013-10-30 Sanyo Electric Co., Ltd. Climatiseur de type d'assemblage au plafond et son unité intérieure
JP2010138700A (ja) 2008-12-09 2010-06-24 Daikin Ind Ltd 遠心送風機
JP2013108684A (ja) 2011-11-22 2013-06-06 Hitachi Appliances Inc 空気調和機の室内機
JP5811134B2 (ja) * 2013-04-30 2015-11-11 ダイキン工業株式会社 空気調和機の室内ユニット
JP5668782B2 (ja) * 2013-04-30 2015-02-12 ダイキン工業株式会社 化粧パネル及びそれを備えた空気調和機の室内ユニット
JP5641089B2 (ja) * 2013-04-30 2014-12-17 ダイキン工業株式会社 化粧パネル及びそれを備えた空気調和機の室内ユニット
JP2015114089A (ja) * 2013-12-16 2015-06-22 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． 天井埋込型室内機及びそれを用いた空気調和機
JP2015132425A (ja) * 2014-01-14 2015-07-23 三菱電機株式会社 空気調和機
WO2015125673A1 (fr) * 2014-02-18 2015-08-27 東芝キヤリア株式会社 Climatiseur
JP2016011827A (ja) * 2014-06-05 2016-01-21 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． 天井埋込型室内機及びそれを用いた空気調和機
JP6458984B2 (ja) * 2014-10-10 2019-01-30 株式会社富士通ゼネラル 天井埋込型空気調和機
JP6369684B2 (ja) * 2014-10-10 2018-08-08 株式会社富士通ゼネラル 天井埋込型空気調和機
US20170299201A1 (en) * 2014-11-28 2017-10-19 Johnson Controls-Hitachi Air Conditioning Technology (Hong Kong) Limited Indoor unit for air conditioner
JP6504349B2 (ja) * 2015-03-31 2019-04-24 株式会社富士通ゼネラル 天井埋込型空気調和機
US10473356B2 (en) 2015-07-08 2019-11-12 Hitachi-Johnson Controls Air Conditioning, Inc. Indoor unit for air conditioner
CN105546661B (zh) * 2016-02-19 2018-11-06 珠海格力电器股份有限公司 空调器
JP2017215091A (ja) * 2016-05-31 2017-12-07 日立ジョンソンコントロールズ空調株式会社 空気調和機の室内機

Also Published As

Publication number Publication date
EP3748238C0 (fr) 2025-12-31
JP2019132475A (ja) 2019-08-08
ES3058506T3 (en) 2026-03-11
EP3748238B1 (fr) 2025-12-31
CN212746683U (zh) 2021-03-19
WO2019150691A1 (fr) 2019-08-08
JP7278710B2 (ja) 2023-05-22
EP3748238A4 (fr) 2021-10-20

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