EP4001784B1 - Heat source unit for refrigeration device - Google Patents

Heat source unit for refrigeration device Download PDF

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Publication number
EP4001784B1
EP4001784B1 EP20850584.2A EP20850584A EP4001784B1 EP 4001784 B1 EP4001784 B1 EP 4001784B1 EP 20850584 A EP20850584 A EP 20850584A EP 4001784 B1 EP4001784 B1 EP 4001784B1
Authority
EP
European Patent Office
Prior art keywords
casing
propeller fan
distance
heat exchanger
fan
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.)
Active
Application number
EP20850584.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP4001784A4 (en
EP4001784A1 (en
Inventor
Zuozhou Chen
Kaname Maruyama
Masahito Higashida
Shigenori Kondou
Ryuusuke Ohtaguro
Hironobu Teraoka
Tooru Iwata
Tetsuya Okamoto
Kazushi Hisayama
Kebi Chen
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.)
Daikin Industries Ltd
Original Assignee
Daikin 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
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of EP4001784A1 publication Critical patent/EP4001784A1/en
Publication of EP4001784A4 publication Critical patent/EP4001784A4/en
Application granted granted Critical
Publication of EP4001784B1 publication Critical patent/EP4001784B1/en
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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/40—Vibration or noise prevention at outdoor units
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/46—Component arrangements in separate outdoor units
    • F24F1/48—Component arrangements in separate outdoor units characterised by air airflow, e.g. inlet or outlet airflow
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/56—Casing or covers of separate outdoor units, e.g. fan guards

Definitions

  • the present invention relates to a heat source unit for a refrigeration apparatus.
  • JP 2009 204290 A discloses a heat source unit including a casing, an outdoor heat exchanger, and a fan (propeller fan).
  • the outdoor heat exchanger has a substantially L-shape, and has a first portion extending along the left side surface of the casing and a second portion extending along the back surface of the casing.
  • JP 2016 164468 A forms basis for the two-part form of independent claim 1.
  • JP 2009 204290 A described above the fan and the first portion of the outdoor heat exchanger are close to each other.
  • the velocity of air flowing through the first portion of the outdoor heat exchanger into the fan is higher than that of air flowing through the second portion of the outdoor heat exchanger into the fan. If the air that has passed through the heat exchanger with such a shape is sucked into the fan, the flow rate of the air sucked into the fan varies significantly from area to area, resulting in noise generated by rotation of the fan.
  • the invention is directed to a heat source unit (3) for a refrigeration apparatus (1).
  • the heat source unit (3) includes: a box-shaped casing (50) having a back surface and one side surface each having an inlet (53), and a front surface having an outlet (52); a partition plate (51) provided inside the casing (50) to face the one side surface of the casing (50), the partition plate (51) defining an air passage (A) that allows the inlet (53) and the outlet (52) to communicate with each other; a heat exchanger (60) provided in the air passage (A) and having a first portion (61) along the back surface of the casing (50) and a second portion (62) along the one side surface of the casing (50); and a propeller fan (70) provided in the air passage (A) to blow air toward the outlet (52) of the casing (50).
  • a first distance S1 and a second distance S2 satisfies a relationship "6 ⁇ S1/S2," where the first distance S1 is a shortest distance between an outer peripheral circle (V) of the propeller fan (70) and the second portion (62) of the heat exchanger (60), and the second distance S2 is a shortest distance between the outer peripheral circle (V) of the propeller fan (70) and the partition plate (51).
  • the second distance S2 is longer than or equal to 10 mm and is shorter than or equal to 40 mm.
  • An air conditioner (1) is a refrigeration apparatus that performs a refrigeration cycle.
  • the air conditioner (1) performs a cooling operation for lowering the indoor temperature, a heating operation for increasing the indoor temperature, and any other operations.
  • the air conditioner (1) includes an indoor unit (2), an outdoor unit (3), and a refrigerant pipe (4).
  • the indoor unit (2) is attached to a wall surface in a room.
  • the indoor unit (2) includes therein an indoor heat exchanger and a fan (which are not shown).
  • the outdoor unit (3) is installed outdoors.
  • the outdoor unit (3) includes therein an outdoor heat exchanger (60), which will be described below.
  • the refrigerant pipe (4) connects the indoor unit (2) and the outdoor unit (3) together.
  • the outdoor unit (3) is a heat source unit.
  • the outdoor unit (3) includes a casing (50), the outdoor heat exchanger (60) (hereinafter referred to as the "heat exchanger"), a propeller fan (70), a fan motor (80), and a bell mouth (90).
  • the terms "right,” “left,” “front,” “rear,” “back,” “top,” “bottom,” in the following description refer to the directions illustrated in FIGS. 2 and 3 .
  • the casing (50) has the shape of a substantially rectangular parallelepiped box.
  • a partition plate (51) extending in a substantially vertical direction is provided inside the casing (50).
  • the partition plate (51) partitions the interior of the casing (50) into a machine chamber (R1) and a blower chamber (R2).
  • the partition plate (51) faces the left side surface of the casing (50).
  • the partition plate (51) is substantially parallel to the left side surface of the casing (50).
  • the partition plate (51) is inclined from an intermediate point thereof in the front-to-back direction toward the right side surface of the casing (50).
  • the machine chamber (R1) is formed on the right side of the partition plate (51).
  • the machine chamber (R1) includes a compressor (55) and a control unit (not shown).
  • the compressor (55) is used to compress a refrigerant flowing through the refrigerant pipe (4).
  • the control unit houses a control board and electrical components for controlling driving of the compressor (55) and the fan motor (80).
  • the blower chamber (R2) is formed on the left side of the partition plate (51).
  • the blower chamber (R2) includes the heat exchanger (60), the propeller fan (70), the fan motor (80), and the bell mouth (90), which will be described below.
  • the casing (50) has an outlet (52) and inlets (53).
  • the outlet (52) is formed in the front surface of the casing (50).
  • the outlet (52) has a substantially circular shape.
  • the respective inlets (53) are formed in the back (rear) and left side surfaces of the casing (50).
  • the blower chamber (R2) forms an air passage (A) that allows the inlets (53) and the outlet (52) to communicate with each other.
  • the air passage (A) is defined in the casing (50) by the partition plate (51) to allow the inlets (53) and the outlet (52) to communicate with each other.
  • the heat exchanger (60) is a so-called cross-fin-type fin-and-tube heat exchanger.
  • the heat exchanger (60) is used to allow the air sucked through the inlets (53) into the casing (50) to exchange heat with the refrigerant.
  • the heat exchanger (60) is provided in the blower chamber (R2). In other words, the heat exchanger (60) is provided in the air passage (A).
  • the heat exchanger (60) has a substantially L-shape in plan view (as viewed from above).
  • the heat exchanger (60) is disposed along the back and left side surfaces of the casing (50).
  • the heat exchanger (60) has a first portion (61) extending along the back surface of the casing (50), and a second portion (62) extending along the left side surface of the casing (50).
  • the first portion (61) extends substantially parallel to a direction substantially orthogonal to the center axis (Y) of rotation of the propeller fan (70).
  • the second portion (62) extends substantially parallel to the center axis (Y) of rotation of the propeller fan (70).
  • the propeller fan (70) is used to send air in the blower chamber (R2) to the outside of the outdoor unit (3).
  • the propeller fan (70) is provided in the blower chamber (R2).
  • the propeller fan (70) is provided in the air passage (A).
  • the propeller fan (70) is disposed near the outlet (52) (near the front surface of the casing (50)).
  • the propeller fan (70) is disposed between the second portion (62) of the heat exchanger (60) and the partition plate (51) as viewed from the front.
  • the center axis (Y) of rotation of the propeller fan (70) is generally orthogonal to the front and back surfaces of the casing (50).
  • the propeller fan (70) has a plurality of blades (71).
  • the propeller fan (70) blows air toward the outlet (52) of the casing (50).
  • the propeller fan (70) is positioned to correspond to the outlet (52) of the casing (50).
  • the propeller fan (70) rotated by the fan motor (80) produces an air flow so that air that has exchanged heat in the heat exchanger (60) flows toward the front surface of the casing (50).
  • the shortest distance between the outer peripheral circle (V) of the propeller fan (70) and the inner surface of the second portion (62) of the heat exchanger (60) is defined as a "first distance S 1”
  • the shortest distance between the outer peripheral circle (V) of the propeller fan (70) and the inner surface of the partition plate (51) is defined as a "second distance S2.”
  • S1/S2 6.
  • the outdoor unit (3) of this embodiment satisfies the relationship "6 ⁇ S1/S2.”
  • the outer peripheral circle (V) of the propeller fan (70) is an imaginary circle passing through portions of the blades (71) of the propeller fan (70) that are farthest from the center axis (Y) of rotation of the propeller fan (70).
  • the center of the outer peripheral circle (V) of the propeller fan (70) is located on the center axis (Y) of rotation of the propeller fan (70).
  • the second distance S2 which is the shortest distance between the outer peripheral circle (V) of the propeller fan (70) and the inner surface of the partition plate (51), is 40 mm.
  • the outdoor unit (3) of the present embodiment satisfies the condition where the second distance S2 is shorter than or equal to 40 mm.
  • the fan motor (80) is provided in the blower chamber (R2). In other words, the fan motor (80) is provided in the air passage (A).
  • the fan motor (80) is a rotational drive source of the propeller fan (70).
  • the fan motor (80) is fixed to a fan motor base (not shown) attached to the back surface of the casing (50).
  • An output shaft of the fan motor (80) is connected to the propeller fan (70).
  • the center axis of the output shaft of the fan motor (80) substantially coincides with the center axis (Y) of rotation of the propeller fan (70). If the fan motor (80) rotates in response to a drive control signal output from the control board of the control unit, this rotation is transmitted via the output shaft of the fan motor (80) to the propeller fan (70), which thus rotates.
  • the bell mouth (90) is provided in the blower chamber (R2).
  • the bell mouth (90) has an annular shape.
  • the bell mouth (90) surrounds the whole circumference of the propeller fan (70).
  • the bell mouth (90) is positioned to correspond to the propeller fan (70) and the outlet (52) of the casing (50).
  • the bell mouth (90) is fixed to the casing (50).
  • the bell mouth (90) has an opening (not shown) for guiding the air flow produced by the propeller fan (70) to the outside of the casing (50).
  • a meshed outlet grille (not shown) is attached to the front surface of the casing (50) to cover the opening.
  • the propeller fan (70) is driven by the fan motor (80), and air is sucked through the inlets (53) into the casing (50).
  • the air sucked into the casing (50) passes through the heat exchanger (60) facing the inlets (53), and exchanges heat with the refrigerant.
  • the air that has passed through the heat exchanger (60) flows toward the front of the casing (50), and is delivered forward by the blades (71) of the propeller fan (70).
  • the delivered air is discharged through the outlet (52) to the outside of the casing (50).
  • FIG. 4 is a graph showing the relationship between the frequency and sound power level of blower sound from the outdoor unit (3). Specifically, FIG. 4 is a graph showing the sound power levels at different frequencies of the blower sound produced from the outdoor unit (3) in a situation where the rotational speed of the propeller fan (70) is 650 rpm. The second distance S2 in this experiment was 10 mm.
  • FIG. 5 is a graph showing the relationship between S1/S2 and the sound power level at 125 Hz. Specifically, FIG. 5 is a graph obtained by plotting the sound power levels of sound at 125 Hz produced from the outdoor unit (3) at S1/S2 of 2, 6, and 11 in a situation where the rotational speed of the propeller fan (70) is 650 rpm.
  • FIG. 6 is a graph showing the relationship between the second distance S2 and the sound power level. Specifically, FIG. 6 is a graph obtained by plotting the sound power levels of the blower sound from the outdoor unit at second distances S2 of 10 mm, 35 mm, and 60 mm in a situation where the rotational speed of the propeller fan (70) is 650 rpm.
  • an outdoor unit (3) of an air conditioner (1) includes: a box-shaped casing (50) having a back surface and left side surface each having an inlet (53), and a front surface having an outlet (52); a partition plate (51) provided inside the casing (50) to face the left side surface of the casing (50), the partition plate (51) defining an air passage (A) that allows the inlet (53) and the outlet (52) to communicate with each other; a heat exchanger (60) provided in the air passage (A) and having a first portion (61) along the back surface of the casing (50) and a second portion (62) along the left side surface of the casing (50); and a propeller fan (70) provided in the air passage (A) to blow air toward the outlet (52) of the casing (50).
  • a first distance S 1 that is the shortest distance between the outer peripheral circle (V) of the propeller fan (70) and the second portion (62) of the heat exchanger (60) and a second distance S2 that is the shortest distance between the outer peripheral circle (V) of the propeller fan (70) and the partition plate (51) satisfy the relation "6 ⁇ S1/S2.”
  • the outer peripheral circle (V) of the propeller fan (70) is some distance away from the second portion (62) of the heat exchanger (60). This allows the difference in air velocity between an area closer to the first portion (61) of the heat exchanger (60) and an area closer to the second portion (62) of the heat exchanger (60) to be smaller than in the known art. This can reduce noise produced by the rotation of the propeller fan (70).
  • the second distance S2 is shorter than or equal to 40 mm.
  • the first distance S 1 can be set to be long. This allows the difference in air velocity between the area closer to the first portion (61) of the heat exchanger (60) and the area closer to the second portion (62) of the heat exchanger (60) to be smaller than in the known art. This can reduce noise produced by the rotation of the propeller fan (70).
  • the casing (50) of the foregoing embodiment may have its blower chamber (R2) formed on the right side of the partition plate (51).
  • one of the inlets (53) may be formed in the right side surface of the casing (50), and the second portion (62) of the heat exchanger (60) may be formed along the right side surface of the casing.
  • the present invention is useful for a heat source unit for a refrigeration apparatus.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)
EP20850584.2A 2019-08-07 2020-08-07 Heat source unit for refrigeration device Active EP4001784B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019145394A JP7051764B2 (ja) 2019-08-07 2019-08-07 冷凍装置の熱源ユニット
PCT/JP2020/030412 WO2021025153A1 (ja) 2019-08-07 2020-08-07 冷凍装置の熱源ユニット

Publications (3)

Publication Number Publication Date
EP4001784A1 EP4001784A1 (en) 2022-05-25
EP4001784A4 EP4001784A4 (en) 2022-08-31
EP4001784B1 true EP4001784B1 (en) 2024-01-31

Family

ID=74502973

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20850584.2A Active EP4001784B1 (en) 2019-08-07 2020-08-07 Heat source unit for refrigeration device

Country Status (4)

Country Link
EP (1) EP4001784B1 (ja)
JP (1) JP7051764B2 (ja)
PL (1) PL4001784T3 (ja)
WO (1) WO2021025153A1 (ja)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000205601A (ja) * 1999-01-08 2000-07-28 Hitachi Ltd 空気調和機用室外ユニット
JP4106790B2 (ja) * 1999-01-19 2008-06-25 トヨタ自動車株式会社 車両の制御装置
JP2001108201A (ja) * 1999-10-04 2001-04-20 Mitsubishi Heavy Ind Ltd 多重圧排熱ボイラ
JP2001108261A (ja) * 1999-10-07 2001-04-20 Hitachi Ltd 空気調和機の室外機
JP4690682B2 (ja) * 2004-09-07 2011-06-01 三菱電機株式会社 空調機
JP2009204290A (ja) 2008-02-29 2009-09-10 Daikin Ind Ltd 冷凍装置の熱源ユニット
JP2010127590A (ja) * 2008-12-01 2010-06-10 Mitsubishi Electric Corp 空気調和機の室外機及びこの室外機を備えた空気調和機
JP5562374B2 (ja) 2012-04-16 2014-07-30 三菱電機株式会社 送風装置
JP2014020741A (ja) * 2012-07-23 2014-02-03 Panasonic Corp ヒートポンプ装置およびそれを備えた温水生成装置
JP2014081147A (ja) * 2012-10-17 2014-05-08 Hitachi Appliances Inc 空気調和機の室外ユニット
JP2016164468A (ja) * 2015-03-06 2016-09-08 三菱重工業株式会社 空気調和機用室外機
KR102163905B1 (ko) * 2016-01-25 2020-10-12 미쓰비시덴키 가부시키가이샤 실외기 및 그것을 구비한 공기 조화기
JPWO2018016012A1 (ja) * 2016-07-19 2019-02-28 三菱電機株式会社 熱源機及び冷凍サイクル装置
JP6698878B2 (ja) * 2017-01-10 2020-05-27 三菱電機株式会社 空気調和機の室外機

Also Published As

Publication number Publication date
JP2021025727A (ja) 2021-02-22
EP4001784A4 (en) 2022-08-31
EP4001784A1 (en) 2022-05-25
JP7051764B2 (ja) 2022-04-11
PL4001784T3 (pl) 2024-06-03
WO2021025153A1 (ja) 2021-02-11

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