EP2871427A1 - Unité extérieure pour dispositif de climatisation - Google Patents

Unité extérieure pour dispositif de climatisation Download PDF

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Publication number
EP2871427A1
EP2871427A1 EP20140190909 EP14190909A EP2871427A1 EP 2871427 A1 EP2871427 A1 EP 2871427A1 EP 20140190909 EP20140190909 EP 20140190909 EP 14190909 A EP14190909 A EP 14190909A EP 2871427 A1 EP2871427 A1 EP 2871427A1
Authority
EP
European Patent Office
Prior art keywords
air
heater
outdoor unit
disposed
bell mouth
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
EP20140190909
Other languages
German (de)
English (en)
Other versions
EP2871427B1 (fr
Inventor
Koji Yamaguchi
Tetsuo Yamashita
Masatomo Hatta
Minoru Ishii
Reiji Morioka
Tetsuya Tazawa
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 Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2871427A1 publication Critical patent/EP2871427A1/fr
Application granted granted Critical
Publication of EP2871427B1 publication Critical patent/EP2871427B1/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
    • 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
    • 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
    • F24F1/36—Drip trays for 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
    • F24F1/26—Refrigerant piping
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of 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
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/34—Heater, e.g. gas burner, electric air heater

Definitions

  • the present invention relates to an outdoor unit for an air-conditioning device.
  • heat pump air-conditioning devices during a heating operation in which an outdoor heat exchanger serves as an evaporator, heat exchange may be interrupted due to frost formed on the outdoor heat exchanger. Accordingly, heat pump air-conditioning devices have conventionally been proposed which perform a defrost operation to remove frost when frost formation is detected.
  • frost adhered on the outdoor heat exchanger melts into drain water and, by extension, into water vapor.
  • the drain water generated by the defrost operation drops on the upper surface of a bottom panel which forms the bottom of a housing of the outdoor unit, and is then discharged to the outside of the outdoor unit through a drain discharging hole which is formed on the bottom panel. Further, water vapor generated by the defrost operation is discharged to the outside of the outdoor unit by natural convection or by rotation of a fan during a heating operation after the end of the defrost operation.
  • the outdoor unit Upon wide use of heat pump air-conditioning devices, the outdoor unit is sometimes installed in an extremely cold climate (where the outside air temperature is 0 degrees C or below) in addition to a cold climate, as in the conventional case.
  • the surface temperatures of the outdoor heat exchanger and the housing are 0 degrees C or below, as well as the outside air temperature. Accordingly, water vapor generated during a defrost operation may collect and refreeze in the housing, which remains frosted. Further, ice which is generated from frozen water vapor does not melt during a defrost operation. Upon repeated defrost operations, the ice may grow into icicles by repeating refreezing.
  • the heater described in Patent Literature 1 there is a problem that the water vapor adhered on a member other than the bottom panel cannot sufficiently be prevented from freezing since the heater is disposed on the upper surface of the bottom panel.
  • the amount of air flowing on the outer periphery of a bell mouth during a fan operation is small and air stagnation occurs.
  • water vapor generated during the defrost operation tends to accumulate and ice tends to grow on the bell mouth.
  • ice generated from the frozen water vapor adhered on the bell mouth may come into contact with a propeller fan disposed inside the outdoor unit, and break the propeller fan, or may apply a load to a fan motor which drives the propeller fan, and break the propeller fan.
  • the present invention is made in light of the above problems, and has as its object to provide an outdoor unit for an air-conditioning device that prevents water vapor adhered on the bell mouth from freezing.
  • An outdoor unit for an air-conditioning device includes a housing having a front panel in which an opening is formed, a fan disposed in an air-sending device chamber which is formed inside the housing, an outdoor heat exchanger disposed in the air-sending device chamber, a bell mouth which is disposed in the air-sending device chamber and extends backwards from a periphery of the opening, and a heater which is disposed in the air-sending device chamber and extends in the up and down direction.
  • a heater which extends in the up and down direction is provided in an air-sending device chamber in which a bell mouth is provided. Accordingly, even if water vapor adheres to the bell mouth during a defrost operation, the temperature of the water vapor adhered on the bell mouth becomes 0 degrees C or higher due to heat generated by the heater. As a result, it is possible to prevent the water vapor adhered on the bell mouth from freezing in an extremely cold environment where the outside air temperature is 0 degrees C or below.
  • Fig. 1 is a perspective view of an outdoor unit 100 of an air-conditioning device according to Embodiment.
  • Fig. 2 is an exploded perspective view of the outdoor unit 100 of the air-conditioning device according to Embodiment.
  • Fig. 3 is an exploded perspective view of the outdoor unit 100 of the air-conditioning device according to Embodiment, and shows details of Fig. 2 .
  • an outer cover of the outdoor unit 100 is implemented in a housing 50.
  • the housing 50 includes a front and side panel 50a, a right side panel 50b, a bottom panel 50c, a top panel 50d and a back panel 50e (see Fig. 4 ).
  • the front and side panel 50a is implemented using, for example, a member having an L shape, as seen in a plan view, and forms the front face and the left side face of the housing 50.
  • a partition 1 is provided in the housing 50. Using the partition 1, the inner space of the housing 50 is divided into a machine chamber 10 and an air-sending device chamber 20.
  • the front and side panel 50a may be implemented using separate members, which individually form the front face and the left side face of the housing 50. That is, the front and side panel 50a may be divided into a front panel which forms the front face of the housing 50, and a left side panel which forms the left side face of the housing 50.
  • a compressor 11 and an electrical component box 12 are provided in the machine chamber 10.
  • a control board (not shown) is provided in the electrical component box 12.
  • the control board serves as a member for controlling the rotation speed of the compressor 11 and driving, for example, a heater 30 (to be described later).
  • the control board (not shown) is implemented using hardware such as a circuit device that implements its function, or software running on an arithmetic unit such as a microcomputer or CPU.
  • the air-sending device chamber 20 is provided with an outdoor heat exchanger 21, a fan 22, a fan motor 23 (see Fig. 4 ), a fan motor supporting plate 24, an upper plate 25 and a supporting plate connection portion 26.
  • the outdoor heat exchanger 21 is positioned more to the back of the outdoor unit 100 than the fan 22, the fan motor 23, the fan motor supporting plate 24, the upper plate 25 and the supporting plate connection portion 26.
  • the outdoor heat exchanger 21 has, for example, an L shape, as seen in a plan view, and is disposed to extend along the surface of the left side face of the front and side panel 50a and the back panel 50e.
  • the fan 22 serves as an air-sending means implemented in, for example, a propeller fan, and generates an air circulating flow for effectively exchanging heat.
  • the fan 22 serves to introduce the outside air from the back side of the outdoor unit 100 into the outdoor unit 100, and exhausting it to the front face of the outdoor unit 100.
  • the fan motor 23 serves as a driving means for driving the fan 22, and is mounted on the fan motor supporting plate 24 by using a fixing means such as a screw.
  • the fan motor supporting plate 24 serves to support the fan motor 23, and is a frame-shaped member which extends upwards from the bottom panel 50c. Note that a plurality of fan motor supporting plates 24 may be provided, instead of a single fan motor supporting plate 24 as shown in the drawings.
  • the upper plate 25 is implemented using a plate member which is, for example, almost parallel to the bottom panel 50c.
  • the upper plate 25 serves as a member for reinforcing the strength of the fan motor supporting plate 24 to cope with the situation in which the fan motor 23 is comparatively large.
  • the upper plate 25 is connected to the fan motor supporting plate 24.
  • the upper plate 25 is mounted, for example, on the top end of the fan motor supporting plate 24 and extends to the front.
  • the supporting plate connection portion 26 is, for example, a U-shaped member, and is integrated with the fan motor supporting plate 24.
  • the inner surface of the supporting plate connection portion 26 is in contact with the upper surface of the outdoor heat exchanger 21.
  • the fan motor supporting plate 24 is fixed to the outdoor heat exchanger 21 by mounting the supporting plate connection portion 26 on the outdoor heat exchanger 21.
  • an opening 50a1 is formed in the front and side panel 50a.
  • the opening 50a1 serves to exhaust, to the outside of the outdoor unit 100, the outside air introduced into the outdoor unit 100.
  • a bell mouth 27 is provided on the back side of the front and side panel 50a so as to surround the outer periphery of the fan 22.
  • the bell mouth 27 includes, for example, a convergent portion 27a which extends backwards so that its diameter is smaller in areas more radially inward and farther from the periphery of the opening 50a1, and a divergent portion 27b which extends backwards so that its diameter is larger in areas more radially outward and farther from the back end of the convergent portion 27a.
  • the bell mouth 27 is integrated with the front and side panel 50a.
  • the bell mouth 27 serves to guide the outside air introduced in the housing 50 to the opening 50a1.
  • the bell mouth 27 may be formed to have a portion extending in the front and back direction between the convergent portion 27a and the divergent portion 27b.
  • Fig. 4 is a cross-sectional view taken along the line X-X of Fig. 1 .
  • Fig. 5 is a cross-sectional view taken along the line Y-Y of Fig. 1 .
  • a flow of air is schematically shown as an air flow A using arrows.
  • An air flow passage formed inside and outside the housing 50 will be described below with reference to Figs. 4 and 5 .
  • Fig. 6 is a view showing how the heater 30 is disposed in the outdoor unit 100 of the air-conditioning device according to Embodiment.
  • Fig. 7 is a cross-sectional view taken along the line X-X of Fig. 1 , and shows how the heater 30 is disposed in the outdoor unit 100.
  • the heater 30 which extends in the up and down direction is mounted in the outdoor heat exchanger 21 via a heater supporting member 28.
  • the heater 30 serves as a heating means implemented in, for example, a sheath heater, and heats the water vapor generated inside the housing 50.
  • a nichrome wire is provided inside the heater 30.
  • the heater 30 may be implemented in a flexible heater. This configuration facilitates positioning of the heater 30 in the housing 50. As shown in Fig. 7 , the heater 30 has a circular cross-section.
  • the heater 30 is disposed between a portion of the outdoor heat exchanger 21 which extends in the front and back direction along the left side face of the front and side panel 50a and the back end of the convergent portion 27a of the bell mouth 27 which opposes the left side face of the front and side panel 50a.
  • the heater 30 is bent in the vicinity of the heater supporting member 28 to form an inverted U shape, as seen in a side view, and is located around the outdoor heat exchanger 21.
  • the heater 30 is used with a power consumption of, for example, 100 W at a temperature of, for example, 30 degrees C.
  • the heater 30 is activated when an outside air temperature sensor (not shown) detects a predetermined temperature or below during a heating operation.
  • the power consumption and temperature of the heater 30 are not limited to the above-mentioned values, and are determined as appropriate so that the water vapor generated in the housing 50 is heated.
  • the heater 30 further extends in the right and left direction on the upper surface of the bottom panel 50c.
  • the heater 30 is desirably disposed on the front part of the bottom panel 50c.
  • the heater 30 is preferably disposed, for example, on the upper surface of the bottom panel 50c more to the front than the back end of the bell mouth 27 as seen in a plan view.
  • the heater 30 extends in the up and down direction in the vicinity of the left side face of the front and side panel 50a and does not extend on the front part of the upper surface of the bottom panel 50c. In this configuration as well, it is possible to prevent the water vapor adhered on the bell mouth 27 from freezing.
  • a configuration is also possible in which the heater 30 extends in the up and down direction while curving to the right and left instead of the use of a heater 30 extending straight in the up and down direction as shown in Fig. 6 .
  • the surface area of the heater 30, at which it emits heat to the bell mouth 27, increases, it is possible to reliably prevent the water vapor adhered on the bell mouth 27 from freezing.
  • the operation of the outdoor unit 100 in an extremely cold climate where the outside air temperature is 0 degrees C or below will be described next.
  • the above-described control board (not shown) controls the operation of the outdoor unit 100 in response to, for example, an operation of an operation means (not shown) through which a user sets an operation mode.
  • the operation mode can be, for example, a heating operation or a cooling operation, the following description assumes a heating operation as the set operation mode.
  • the fan 22 rotates and the outside air is introduced into the housing 50, as described above. Since the outdoor heat exchanger 21 functions as an evaporator, the outside air introduced in the housing 50 exchanges heat with the refrigerant in the outdoor heat exchanger 21 and has its temperature lowered. The outside air whose temperature is lowered is blown to a member such as the bell mouth 27 in the air-sending device chamber 20.
  • the control board activates the heater 30. Accordingly, when the heater 30 is activated, heat generated by the heater 30 is transmitted to the bell mouth 27, thereby suppressing frost formation on the bell mouth 27.
  • the control board stops the operation of the compressor 11 and switches a four-way valve (not shown) to enable a cooling operation. Then, the control board resumes the operation of the compressor 11 and stops the rotation of the fan 22. Upon this operation, a defrost operation starts.
  • the outdoor heat exchanger 21 functions as a condenser, the refrigerant discharged from the compressor 11 flows into the outdoor heat exchanger 21 so as to generate heat in the outdoor heat exchanger 21. Accordingly, by the defrost operation the temperature inside the housing 50 can be increased using the heat in the outdoor heat exchanger 21.
  • the temperature of the frost adhered on the bell mouth 27 increases and the frost turns into water vapor.
  • the water vapor naturally refreezes if it remains untreated in an extremely cold climate where the outside air temperature is 0 degrees C or below.
  • the heater 30 provided on the bell mouth 27 heats the water vapor adhered on the bell mouth 27. This makes it possible to prevent the water vapor adhered on the bell mouth 27 from refreezing.
  • the heater 30 may be implemented using a hot gas bypass (not shown) which directly supplies to the outdoor heat exchanger 21 at least a part of the refrigerant discharged from the compressor 11.
  • a refrigerant stream having a temperature and pressure higher than those of a refrigerant stream discharged from the compressor 11 and supplied to the outdoor heat exchanger 21 through an indoor heat exchanger (not shown) flows in the hot gas bypass. Accordingly, the bell mouth 27 can be heated by using heat generated by the refrigerant which flows in the hot gas bypass.
  • the outdoor unit 100 includes the housing 50 having the front and side panel 50a in which the opening 50a1 is formed, the fan 22 disposed in the air-sending device chamber 20 which is formed inside the housing 50, the outdoor heat exchanger 21 disposed in the air-sending device chamber 20, the bell mouth 27 which is disposed in the air-sending device chamber 20 and extends backwards from the periphery of the opening 50a1, and the heater 30 which is disposed in the air-sending device chamber 20 and extends in the up and down direction.
  • the heater 30 is disposed more to the side of the outdoor heat exchanger 21 which is provided to extend along the side face of the air-sending device chamber 20 than the bell mouth 27. Accordingly, it is possible to transmit heat generated by the heater 30 to a portion of the bell mouth 27 where heat generated by the compressor 11 is less likely to be transmitted and water vapor is most likely to freeze.
  • Fig. 8 is a view showing how the heater 30 is disposed in the outdoor unit 100 of the air-conditioning device according to Embodiment.
  • Fig. 9 is a view showing how the heater 30 is disposed in the outdoor unit 100 of the air-conditioning device according to Embodiment.
  • Fig. 10 is a view showing how the heater 30 is disposed in the outdoor unit 100 of the air-conditioning device according to Embodiment.
  • a configuration is also possible in which the heater has a plurality of portions bent to form a plurality of inverted and non-inverted U shapes.
  • a configuration is also possible in which the heater 30 extends in the right and left direction in a portion above the top end of the bell mouth 27. With this configuration, it is possible to prevent the water vapor adhered on the upper area of the bell mouth 27 as well as the water vapor adhered on the lower and side areas of the bell mouth 27 from freezing.
  • a configuration is also possible in which the heater is bent around the center of the bell mouth 27 in the up and down direction.
  • the heater 30 having this configuration it is possible to heat the central portion of the bell mouth 27 where air stagnation is most likely to occur. Accordingly, even if a sufficient space for installing the heater 30 is not provided, the water vapor adhered on the bell mouth 27 can be efficiently prevented from freezing.
  • heater supporting member 30 heater 50 housing 50a front and side panel 50a1 opening 50b right side panel 50c bottom panel 50d top panel 50e back panel 100 outdoor unit A air flow A1 air stagnation

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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)
EP14190909.3A 2013-11-07 2014-10-29 Unité extérieure pour dispositif de climatisation Active EP2871427B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2013231388A JP5984782B2 (ja) 2013-11-07 2013-11-07 空気調和機の室外機

Publications (2)

Publication Number Publication Date
EP2871427A1 true EP2871427A1 (fr) 2015-05-13
EP2871427B1 EP2871427B1 (fr) 2019-12-18

Family

ID=51842397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14190909.3A Active EP2871427B1 (fr) 2013-11-07 2014-10-29 Unité extérieure pour dispositif de climatisation

Country Status (5)

Country Link
US (1) US20150121934A1 (fr)
EP (1) EP2871427B1 (fr)
JP (1) JP5984782B2 (fr)
CN (2) CN104633806B (fr)
RU (1) RU2596969C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3348919A4 (fr) * 2016-11-11 2018-11-21 Mitsubishi Electric Corporation Unité extérieure de climatiseur
WO2020204842A1 (fr) * 2019-03-29 2020-10-08 Mitsubishi Electric Consumer Products(Thailand) Co.,Ltd. Unité extérieure pour appareil de climatisation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012101677A1 (fr) * 2011-01-27 2012-08-02 三菱電機株式会社 Appareil de conditionnement d'air
CN105874283A (zh) * 2013-11-29 2016-08-17 东芝三菱电机产业系统株式会社 电气设备壳体
CN104930601B (zh) * 2015-06-25 2019-05-24 广东美的制冷设备有限公司 一种带电加热装置的空调器室外机及其控制方法
WO2017130273A1 (fr) * 2016-01-25 2017-08-03 三菱電機株式会社 Machine extérieure et climatiseur équipé de ladite machine
CN105485791A (zh) * 2016-02-16 2016-04-13 珠海格力电器股份有限公司 空调室外机及其室外机隔板
WO2018076251A1 (fr) * 2016-10-27 2018-05-03 孙海潮 Climatiseur sans givre du type pompe à chaleur frigorifique
JP7031019B2 (ja) * 2019-01-18 2022-03-07 三菱電機株式会社 空気調和機の室外機
JP7262578B2 (ja) * 2019-05-24 2023-04-21 三菱電機株式会社 室外機および冷凍サイクル装置

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JP2008096018A (ja) * 2006-10-11 2008-04-24 Daikin Ind Ltd 空調機の室外ユニット
KR100795605B1 (ko) * 2006-12-18 2008-01-21 삼성전자주식회사 공기조화기 및 그 제어방법
JP2011052941A (ja) 2009-09-04 2011-03-17 Mitsubishi Heavy Ind Ltd 空気調和機の室外機
WO2013051166A1 (fr) * 2011-10-03 2013-04-11 三菱電機株式会社 Dispositif à cycle de réfrigération
EP2765385A1 (fr) * 2011-10-03 2014-08-13 Mitsubishi Electric Corporation Dispositif à cycle de réfrigération
WO2013088713A1 (fr) * 2011-12-12 2013-06-20 ダイキン工業株式会社 Réchauffeur et unité extérieure pour une unité de réfrigération équipée d'un réchauffeur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3348919A4 (fr) * 2016-11-11 2018-11-21 Mitsubishi Electric Corporation Unité extérieure de climatiseur
WO2020204842A1 (fr) * 2019-03-29 2020-10-08 Mitsubishi Electric Consumer Products(Thailand) Co.,Ltd. Unité extérieure pour appareil de climatisation

Also Published As

Publication number Publication date
CN204421234U (zh) 2015-06-24
CN104633806B (zh) 2017-12-29
EP2871427B1 (fr) 2019-12-18
JP2015090260A (ja) 2015-05-11
JP5984782B2 (ja) 2016-09-06
RU2596969C2 (ru) 2016-09-10
RU2014145037A (ru) 2016-05-27
US20150121934A1 (en) 2015-05-07
CN104633806A (zh) 2015-05-20

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