EP1245908B1 - Dispositif de climatisation et unité d' intérieur pour celui-ci - Google Patents

Dispositif de climatisation et unité d' intérieur pour celui-ci Download PDF

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Publication number
EP1245908B1
EP1245908B1 EP02006893A EP02006893A EP1245908B1 EP 1245908 B1 EP1245908 B1 EP 1245908B1 EP 02006893 A EP02006893 A EP 02006893A EP 02006893 A EP02006893 A EP 02006893A EP 1245908 B1 EP1245908 B1 EP 1245908B1
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EP
European Patent Office
Prior art keywords
air
indoor
indoor unit
tangential fan
refrigerant
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
EP02006893A
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German (de)
English (en)
Other versions
EP1245908A2 (fr
EP1245908A3 (fr
Inventor
Kazuhiro c/o Mitsubishi Heavy Ind. Ltd. Suzuki
Hajime Mitsubishi Heavy Ind. Ltd. Izumi
Kiyoshi c/o Mitsubishi Heavy Ind. Ltd. Suenaga
Tetsuo c/o Mitsubishi Heavy Ind. Ltd. Tominaga
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 Ltd
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Mitsubishi Heavy Industries 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
Priority claimed from JP2001093884A external-priority patent/JP2002295862A/ja
Priority claimed from JP2001093886A external-priority patent/JP2002295861A/ja
Priority claimed from JP2001093885A external-priority patent/JP2002295863A/ja
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP1245908A2 publication Critical patent/EP1245908A2/fr
Publication of EP1245908A3 publication Critical patent/EP1245908A3/fr
Application granted granted Critical
Publication of EP1245908B1 publication Critical patent/EP1245908B1/fr
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
    • 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
    • F24F1/0087—Indoor units, e.g. fan coil units with humidification means
    • 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
    • F24F1/0025—Cross-flow or tangential 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
    • F24F1/0057—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in or on a wall

Definitions

  • This invention relates to air conditioners that cool or warm the air to condition room environments as demanded, and particularly to indoor units of air conditioners.
  • FIG. 5 shows a mechanical structure of the indoor unit, an internal section of which is observed from the lateral side.
  • reference numeral 1 designates a body or casing of the indoor unit
  • reference numeral 2 designates an air inlet surface having numerous slits
  • reference numerals 3a, 3b, and 3c designate indoor heat exchangers
  • reference numeral 4 designates an air duct
  • reference numeral 5 designates a tangential fan
  • reference numeral 6 designates a stabilizer
  • reference numeral 7 designates an air outlet.
  • the conventional air conditioner using the aforementioned indoor unit suffers from various problems, which will be described below.
  • the indoor unit provides two narrow areas (or small gaps) in the periphery of the tangential fan 5.
  • One is provided between the tangential fan 5 and the stabilizer 6, and the other is provided between the tangential fan 5 and a casing 8, which is a part of an inwardly bent portion of the body frame and is arranged opposite to the stabilizer 6 via the tangential fan 5.
  • the indoor air When the indoor air flows into the air duct 4 under the effect of the negative pressure, it encounters refrigerant pipes of the indoor heat exchangers 3a, 3b, and 3c respectively, so that it is varied in flow direction, intensity, and speed. That is, flows of the indoor air transmitted through the indoor heat exchangers may have different velocities, which depends upon the transmitted positions of the indoor heat exchangers. Therefore, it is possible to estimate various distributions of velocities with respect to the flows of the indoor air transmitted through the indoor heat exchangers, respectively.
  • the flow of the indoor air transmitted through the indoor heat exchanger 3a which is arranged proximately to the tangential fan 5, becomes extreme in the velocity distribution.
  • the aforementioned flow of the indoor air is continuously cut by the blades of the tangential fan 5 that is rotating. This causes a particular kind of noise called 'Nz' sound in the indoor unit 1.
  • US-A-4014625 discloses a transverse flow fan in which the blade angles of the impeller blades are in a particular relationship to the control angles of the surfaces of a tongue in the casing which extends close to the periphery of the fan.
  • Various control means are provided for improving and stabilizing flow through the impeller, such as a control plate in the inflow space, a tongue surface in the outflow space with a specially shaped depression therein, at least one ring around the impeller at a point along the axial length thereof, and various projections projecting into the outflow space.
  • Particular limited relationships are provided between the position of the tongue and the position of the curved outer wall of the casing where it is closest to the impeller and the curvature of the wall relative to the dimensions of the impeller.
  • An air conditioner of this invention is basically composed of an outdoor unit and an indoor unit.
  • the outdoor unit has an outdoor heat exchanger for performing heat exchanging between outdoor air and refrigerant that is cooled or warmed by indoor air.
  • the indoor unit contains indoor heat exchangers for performing heat exchanging between the indoor air and the refrigerant that is cooled or warmed by the outdoor air, a tangential fan forcing the indoor air to flow through the indoor heat exchangers, and a stabilizer that is arranged in proximity to the tangential fan.
  • dimensions of the indoor unit are determined to satisfy at least one of the three relationships as follows: L 1 ⁇ L 2 1.0 ⁇ s ⁇ L 1 ⁇ 1.3 ⁇ s 1.2 ⁇ s ⁇ L 2 ⁇ 2.0 ⁇ s ; where 'L 1 ' denotes a distance between the circumferential surface of the tangential fan and the stabilizer, 'L 2 ' denotes a distance between the circumferential surface of the tangential fan and a casing that is arranged opposite to the stabilizer via the tangential fan, and 's' denotes a minimal gap between adjoining blades of the tangential fan.
  • FIG. 1 shows an outline layout and construction of the air conditioner of the embodiment.
  • the air conditioner is basically composed of two units, namely an outdoor unit 10 and an indoor unit 20, between which refrigerant circulates via a refrigerant pipe 30.
  • the outdoor unit 10 is composed of an outdoor heat exchanger 11, a compressor 12, and a propeller fan.
  • the outside heat exchanger 11 performs heat exchanging between the outdoor air and the refrigerant that is cooled or warmed by the indoor air.
  • the compressor 12 sends the refrigerant to the outdoor heat exchanger 11 or indoor heat exchangers, which will be described later.
  • the propeller fan 13 forces the outdoor air to flow into the outdoor heat exchanger 11.
  • the indoor unit 20 is composed of indoor heat exchangers 23a, 23b, and 23c, a tangential fan 25, and a stabilizer 26.
  • the indoor heat exchangers 23a, 23b, and 23c perform heat exchanging between the indoor air and the refrigerant that is cooled or warmed by the outdoor air.
  • the tangential fan 25 rotates to cause movement or flow of the indoor air through the indoor heat exchangers 23a, 23b, and 23c.
  • the stabilizer 26 is arranged proximately to the tangential fan 25 to produce an exhausting force for the indoor air.
  • FIG. 2 shows an internal mechanical structure of the indoor unit 20 in detail.
  • the indoor unit 20 also contains a body or casing 21, an air inlet surface 22, an air duct 24, and an air outlet 27.
  • the air inlet surface 22 covers the front side and upper side of the body 21 of the indoor unit 20
  • the air inlet surface 22 has numerous slits that may substantially block the indoor heat exchangers 23a, 23b, and 23c from view and that ensures air inflow in an effective manner.
  • the indoor heat exchangers 23a, 23b, and 23c are arranged in proximity to the front side and upper side of the body 21 of the indoor unit 20. That is, they are arranged to substantially encompass the tangential fan 25 with appropriate gaps therebetween.
  • the present embodiment uses three indoor heat exchangers; however, the number and arrangement of the indoor heat exchangers may vary greatly depending upon the size and type of the indoor unit. Therefore, it can be said that the number and arrangement of the indoor heat exchangers is not a main factor in this invention.
  • the air duct 24 provides air flows between the indoor heat exchangers 23a, 23b, and 23c and the tangential fan 25 respectively, and it is defined by the body 21 and a casing 28, which corresponds to a part of an inwardly bent portion of the body frame.
  • Both ends of the tangential fan 25 are defined by circular disks 25a, the center of which is pivotally supported by a shaft and the like. Between the circular disks 25a, the prescribed number of blades 25b are arranged at equal spacing therebetween in the circumferential direction of the tangential fan 25.
  • a drive motor (not shown) drives the tangential fan 25 to rotate in the direction of the arrow shown in FIG. 2.
  • the stabilizer 26 is 'horizontally' elongated to have substantially the same length as the tangential fan 25. That is, the stabilizer 26 is arranged just above the air outlet 27 and is arranged in parallel to and in proximity to the tangential fan 25.
  • the refrigerant is compressed by the compressor 12 to produce high temperature and high pressure 'gaseous' refrigerant, which is sent to the indoor unit 20 via a refrigerant pipe 30. Therefore, the gaseous refrigerant circulates through the indoor heat exchangers 23a, 23b, and 23c.
  • the heat of the high temperature and high pressure gaseous refrigerant that passes through the indoor heat exchangers 23a, 23b, and 23c is transferred to the indoor air that is input due to the rotation of the tangential fan 25. Therefore, the warmed air will be supplied into the room by the indoor unit 20.
  • the high temperature and high pressure gaseous refrigerant whose heat may be exhausted in the indoor air is subjected to condensation and liquefaction by the indoor heat exchangers 23a, 23b, and 23c, so that it is converted to high temperature and high pressure 'liquid' refrigerant.
  • the high temperature and high pressure liquid refrigerant is sent back to the outdoor unit 10 via the refrigerant pipe 30, wherein it passes through an expansion valve (not shown). While passing through the expansion valve, it is converted to low temperature and low pressure liquid refrigerant, which is forwarded to the outdoor heat exchanger 11.
  • the low temperature and low pressure liquid refrigerant passing through the outdoor heat exchanger 11 removes the heat from the outdoor air, which is input due to the rotation of the propeller fan 13.
  • the refrigerant inversely flows through the refrigerant pipe 30. That is, the high temperature and high pressure gaseous refrigerant that is compressed by the compressor 12 is sent to the outdoor heat exchanger 11 via the refrigerant pipe 30.
  • the heat of the high temperature and high pressure gaseous refrigerant is transferred to the outdoor air, so that the gaseous refrigerant is subjected to condensation and liquefaction, and is converted to high temperature and high pressure liquid refrigerant, which is supplied to the expansion valve in the outdoor unit 10. While passing through the expansion valve, it is converted to low temperature and low pressure liquid refrigerant, which is sent to the indoor unit 20 via the refrigerant pipe 30.
  • the low temperature and low pressure liquid refrigerant sequentially passes through the indoor heat exchangers 23a, 23b, and 23c.
  • the low temperature and low pressure liquid refrigerant removes the heat from the indoor air, so that it is subjected to evaporation and gasification, and is converted to low temperature and low pressure gaseous refrigerant, which is again sent to the compressor 12.
  • the aforementioned processes are repeated.
  • reference symbol L 1 designates a distance between the circumferential surface of the tangential fan 25 and the stabilizer 26, wherein the circumferential surface of the tangential fan 25 is defined by outer edges of the blades 25b that are subjected to circumferential movement during rotation.
  • reference symbol L 2 designates the shortest distance between the circumferential surface of the tangential fan 25 and the casing 28, which is arranged opposite to the stabilizer 26 via the tangential fan 25.
  • Reference symbol 's' designates a minimal gap between adjoining blades 25b of the tangential fan 25.
  • the prescribed dimensions are established based on the following relationships (a), (b), and (c).
  • L 1 ⁇ L 2 1.0 ⁇ s ⁇ L 1 ⁇ 1.3 ⁇ s 1.2 ⁇ s ⁇ L 2 ⁇ 2.0 ⁇ s
  • the distance L 1 is arranged close to the vortex flow. As the distance L 1 becomes smaller, the air blowing power (or wind power) increases; however, the noise level also increases correspondingly. In addition, as the distance L 2 becomes smaller, the air blowing power increases. Because the aforementioned relationship (a) is established between the distances L 1 and L 2 , the indoor unit 20 can exhibit good aerodynamic performance in any one of the warming mode, cooling mode, and dry mode (dehumidifying mode) while demonstrating noticeable reduction in noise.
  • the indoor unit 20 can exhibit good aerodynamic performance in any one of the warming mode, cooling mode, and dry mode while demonstrating noticeable reduction in noise.
  • prescribed measurements were performed with respect to noise levels actually produced by the indoor unit 20.
  • the measurement result is shown in FIG. 3, which is created using the 'fixed' wind power for the air outlet 27 against each of 'dimensionless' values that are produced by dividing the distance L 1 between the tangential fan 25 and stabilizer 26 by the minimal gap s of the adjoining blades 25b.
  • the horizontal axis represents the dimensionless value 'L 1 /s'
  • the vertical axis represents the noise level dB(A).
  • FIG. 3 shows that the aerodynamic performance is improved while the noise level is extremely increased.
  • L 1 /s> 1.3 i.e., L 1 >1.3s
  • FIG. 3 also shows that the noise level is greatly increased. It can be assumed that the indoor unit 20 causes a relatively large amount of noise because the tangential fan 25 may perform the exhausting action insufficiently to allow the occurrence of the back flow of the air into the air duct 24. If the indoor unit 20 is designed to meet the aforementioned range of L 1 >1.3s, it may be necessary to accept the unwanted reduction of the aerodynamic performance and the increase of the size of the indoor unit 20.
  • the indoor unit 20 could demonstrate good aerodynamic performance in either the cooling or warming operation while demonstrating noticeable reduction in noise.
  • prescribed measurements were performed with respect to the noise levels actually produced by the indoor unit 20.
  • the measurement results are shown in FIG. 4, which is created using the 'fixed' wind power for the air outlet 27 against each of the 'dimensionless' values that are produced by dividing the distance L 2 between the casing 28, arranged opposite to the stabilizer 26, and the circumferential surface of the tangential fan 25 by the minimal gap s of the adjoining blades 25b.
  • the horizontal axis represents the dimensionless value 'L 2 /s'
  • the vertical axis represents the noise level dB(A).
  • FIG. 4 shows that in the range of L 2 /s ⁇ 1.2 (i.e., L 2 ⁇ 1.2s), the aerodynamic performance is improved while the noise level is extremely increased.
  • L 2 /s>2.0 i.e., L 2 >2.0s
  • the noise level is increased as well.
  • the indoor unit 20 causes a relatively large noise because the tangential fan 25 may perform the exhausting action insufficiently to allow the occurrence of the back flow of the air into the air duct 24. If the indoor unit 20 is designed to meet the aforementioned range of L 2 >2.0s, it may be necessary to accept the unwanted reduction of the aerodynamic performance and the increase of the size of the indoor unit 20.
  • the present embodiment determines dimensions of the indoor unit 20 to simultaneously satisfy the aforementioned relationships (a), (b), and (c) with respect to the two narrow areas that are arranged around the tangential fan 25.
  • the present embodiment determines dimensions of the indoor unit 20 to simultaneously satisfy the aforementioned relationships (a), (b), and (c) with respect to the two narrow areas that are arranged around the tangential fan 25.
  • the present embodiment is designed to simultaneously satisfy the aforementioned relationships (a), (b), and (c) with respect to the two narrow areas around the tangential fan 25.
  • it is not always required to simultaneously satisfy the aforementioned three relationships (a), (b), and (c). That is, it is expected to demonstrate certain effects by determining dimensions of the indoor unit 20 based on at least one relationship only. For this reason, it is possible to provide various modifications as follows:

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)

Claims (3)

  1. Unité (20) d'intérieur pour un conditionnement d'air comprenant:
    une pluralité d'échangeurs de chaleur (23a, 23b, 23c) d'intérieur pour effectuer un échange de chaleur entre de l'air d'intérieur et du réfrigérant qui est refroidi ou réchauffé par de l'air d'extérieur ;
    un ventilateur (25) tangentiel pour forcer l' air d'intérieur à passer dans les échangeurs de chaleur (23a, 23b, 23c) d'intérieur ; et
    un stabiliseur (26) qui est disposé à proximité du ventilateur (25) tangentiel ;
    caractérisée en ce que
    les dimensions de l'unité (20) d'intérieur sont déterminées de façon à satisfaire à au moins l'une des relations suivantes :
    a) L 1 < L 2 ;
    Figure imgb0013
    b) 1 , 0 ⁢ s ≤ L 1 ≤ 1 , 3 ⁢ s ;
    Figure imgb0014
    et
    c) 1 , 2 ⁢ s ≤ L 2 ≤ 2 , 0 ⁢ s ;
    Figure imgb0015
    dans lesquelles
    « L1 » signifie une distance entre une surface circonférentielle du ventilateur (25) tangentiel et le stabiliseur (26),
    « L2 » signifie une distance entre la surface circonférentielle du ventilateur (25) tangentiel et une enveloppe (28) qui est disposée à l'opposé du stabiliseur (26) via le ventilateur (25) tangentiel, et
    « s » signifie un intervalle minimum entre des pales (25b) voisines du ventilateur (25) tangentiel.
  2. Unité d'intérieur pour un conditionneur d'air suivant la revendication 1, dans laquelle les dimensions de l'unité d'intérieur sont déterminées de façon à satisfaire à au moins deux des relations a) à c).
  3. Conditionneur d'air comprenant:
    une unité (10) d'extérieur ayant un échangeur de chaleur (11) d'extérieur pour effectuer un échange de chaleur entre de l'air d'extérieur et du réfrigérant qui est refroidi ou réchauffé par de l'air d'intérieur ; et
    une unité (20) d'intérieur, tel que définie à la revendication 1 ou 2, pour effectuer un échange de chaleur entre l'air d'intérieur et le réfrigérant qui est refroidi ou réchauffé par l'air d'extérieur.
EP02006893A 2001-03-28 2002-03-26 Dispositif de climatisation et unité d' intérieur pour celui-ci Expired - Lifetime EP1245908B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2001093886 2001-03-28
JP2001093884 2001-03-28
JP2001093885 2001-03-28
JP2001093884A JP2002295862A (ja) 2001-03-28 2001-03-28 空気調和装置および室内ユニット
JP2001093886A JP2002295861A (ja) 2001-03-28 2001-03-28 空気調和装置および室内ユニット
JP2001093885A JP2002295863A (ja) 2001-03-28 2001-03-28 空気調和装置および室内ユニット

Publications (3)

Publication Number Publication Date
EP1245908A2 EP1245908A2 (fr) 2002-10-02
EP1245908A3 EP1245908A3 (fr) 2004-07-07
EP1245908B1 true EP1245908B1 (fr) 2007-01-17

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EP02006893A Expired - Lifetime EP1245908B1 (fr) 2001-03-28 2002-03-26 Dispositif de climatisation et unité d' intérieur pour celui-ci

Country Status (5)

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EP (1) EP1245908B1 (fr)
CN (1) CN1185446C (fr)
AT (1) ATE352014T1 (fr)
DE (1) DE60217570D1 (fr)
ES (1) ES2276867T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103953584B (zh) * 2009-08-25 2016-08-24 三菱电机株式会社 鼓风机及具有该鼓风机的空调机
CN101703990B (zh) * 2009-09-10 2012-12-26 简甦 用于薄带状物体烘干设备的冷却装置
CN103486664B (zh) * 2012-06-13 2015-12-09 珠海格力电器股份有限公司 室内机
CN103851691A (zh) * 2012-11-28 2014-06-11 珠海格力电器股份有限公司 空调室内机
JP6248486B2 (ja) * 2013-09-11 2017-12-20 ダイキン工業株式会社 空気調和機のダクト型室内機
CN106051933B (zh) * 2016-08-16 2022-09-13 珠海格力电器股份有限公司 空调室内机及空调

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE963809C (de) * 1953-07-17 1957-05-16 Bruno Eck Dr Ing Querstromgeblaese
DE1277505B (de) * 1956-12-07 1968-09-12 Firth Cleveland Ltd Querstromgeblaese
US4014625A (en) * 1973-08-20 1977-03-29 Teruo Yamamoto Transverse flow fan
DE3016438C2 (de) * 1980-04-29 1985-12-19 Standard Elektrik Lorenz Ag, 7000 Stuttgart Querstromlüfter

Also Published As

Publication number Publication date
EP1245908A2 (fr) 2002-10-02
ES2276867T3 (es) 2007-07-01
CN1378056A (zh) 2002-11-06
EP1245908A3 (fr) 2004-07-07
CN1185446C (zh) 2005-01-19
ATE352014T1 (de) 2007-02-15
DE60217570D1 (de) 2007-03-08

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