EP2792955A1 - Réchauffeur et unité extérieure pour une unité de réfrigération équipée d'un réchauffeur - Google Patents

Réchauffeur et unité extérieure pour une unité de réfrigération équipée d'un réchauffeur Download PDF

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Publication number
EP2792955A1
EP2792955A1 EP12857382.1A EP12857382A EP2792955A1 EP 2792955 A1 EP2792955 A1 EP 2792955A1 EP 12857382 A EP12857382 A EP 12857382A EP 2792955 A1 EP2792955 A1 EP 2792955A1
Authority
EP
European Patent Office
Prior art keywords
heater
heat exchanger
outdoor heat
outdoor
casing
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
EP12857382.1A
Other languages
German (de)
English (en)
Other versions
EP2792955A4 (fr
EP2792955B1 (fr
Inventor
Bin Luo
Tadashi Sao
Mikio Kagawa
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 EP2792955A1 publication Critical patent/EP2792955A1/fr
Publication of EP2792955A4 publication Critical patent/EP2792955A4/fr
Application granted granted Critical
Publication of EP2792955B1 publication Critical patent/EP2792955B1/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
    • F24F1/20—Electric components for separate outdoor units
    • F24F1/22—Arrangement or mounting thereof
    • 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
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F24F1/18—Heat exchangers specially adapted for separate outdoor units characterised by their shape
    • 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
    • F24F1/46—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
    • 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
    • F24F1/50—Component arrangements in separate outdoor units characterised by air airflow, e.g. inlet or outlet airflow with outlet air in upward direction
    • 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
    • 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
    • F24F2013/221—Means for preventing condensation or evacuating condensate to avoid the formation of condensate, e.g. dew
    • 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 a heater for avoiding freeze of drain water, and an outdoor unit including the heater for a refrigerator.
  • a typical outdoor unit for a refrigerator includes a heater for avoiding freeze of drain water on an outdoor heat exchanger. See, e.g., PATENT DOCUMENT 1.
  • PATENT DOCUMENT 1 discloses a heater that is disposed on an outdoor unit base and below an outdoor heat exchanger. This heater, in plan view, is in the shape of an L-shaped frame along an L-shaped outdoor heat exchanger. This configuration allows the drain water on the outdoor heat exchanger to drop on the outdoor unit base and to be heated by the heater. This drain water is drained without freeze from a drain outlet disposed on the outdoor unit base.
  • PATENT DOCUMENT 1 Japanese Unexamined Patent Publication No. 2004-69220
  • Some outdoor heat exchangers include four heat exchange surfaces corresponding to four side surfaces of a casing to enlarge the heat exchange area.
  • This outdoor heat exchanger is hereinafter referred to as a "four-surface heat exchanger.”
  • An outdoor unit with the four-surface heat exchanger includes a heater that is in the shape of a rectangular frame along the four-surface heat exchanger to avoid freeze of drain water on the four-surface heat exchanger. Installation of this heater shaped along the four-surface heat exchanger is complicated. For example, the heater might be stuck on the four-surface heat exchanger when retrofitted or installed for maintenance.
  • the first aspect of the invention provides a heater for avoiding freeze of drain water on an outdoor heat exchanger (30) of an outdoor unit (10) for a refrigerator.
  • the outdoor unit (10) includes a casing (20) including four side surfaces (4).
  • the outdoor unit (10) also includes the outdoor heat exchanger (30) disposed in the casing (20), including four heat exchange surfaces (30a) corresponding to the side surfaces (4) of the casing (20), and including an opening (3a) disposed on side surfaces of the outdoor heat exchanger (30).
  • the heater is in a shape of a rectangular frame along a lower end portion of the outdoor heat exchanger (30).
  • the heater includes hinges (70) allowing the heater to fold longitudinally.
  • the heater (75) of the first aspect of the invention is for the outdoor unit (10) of the refrigerator.
  • the heater (75) is in the shape of a rectangular frame along the lower end portion of the outdoor heat exchanger (30).
  • the outdoor heat exchanger (30) includes the four heat exchange surfaces (30a).
  • the outdoor heat exchanger (30) includes the opening (3a) disposed on the side surfaces of the outdoor heat exchanger (30).
  • This heater (75) includes the hinges (70) allowing the heater (75) to fold longitudinally. In other words, the hinges (70) fold so that the heater (75) folds longitudinally.
  • the heater (75) that is folded is placed inside the outdoor heat exchanger (30) through the opening (3a) on the side surface of the outdoor heat exchanger (30). Then, the heater (75) is attached along the lower end portion of the outdoor heat exchanger (30).
  • the second aspect of the invention provides the heater (75), of the first aspect of the invention, including a first heating portion (76) and a second heating portion (77) that are aligned longitudinally.
  • the hinges (70) are wirings (78, 79) connecting the first heating portion (76) and the second heating portion (77).
  • the heater (75) of the second aspect of the invention includes the first heating portion (76) and the second heating portion (77) that are aligned longitudinally.
  • the hinges (70) are the wirings (78, 79) connecting the two heating portions (76, 77).
  • the wirings (78, 79) are able to fold. In other words, the wirings (78, 79) fold so that the heater (75) folds longitudinally.
  • the third aspect of the invention provides the heater (75) of the second aspect of the invention.
  • the first heating portion (76) of the second aspect of the invention includes a body (76a) and end portions (76b).
  • the second heating portion (77) includes a body (77a) and end portions (77b).
  • the bodies (76a, 77a) extend along a bottom board (22) of the casing (20).
  • the end portions (76b, 77b) are bent upward from the bodies (76a, 77a).
  • the end portions (76b, 77b) are connected with the wirings (78, 79).
  • the first heating portion (76) of the third aspect of the invention includes a body (76a) and end portions (76b).
  • the second heating portion (77) includes a body (77a) and end portions (77b).
  • the bodies (76a, 77a) extend along a bottom board (22) of the casing (20).
  • the end portions (76b, 77b) are bent upward from the bodies (76a, 77a).
  • the end portions (76b, 77b) are connected with the wirings (78, 79) serving as the hinges (70).
  • the end portions (76b, 77b) connected with the wirings (78, 79) extend upward from the bottom board (22).
  • the wirings (78, 79) connecting the heating portions (76, 77) are not in contact with the bottom board (22), of the casing (20), receiving the drain water. This configuration prevents the wirings (78, 79) connecting the heating portions (76, 77) from being in contact with the drain water.
  • the fourth aspect of the invention provides the outdoor unit, for the refrigerator, including the heater (75) of any one of the first to third aspects of the invention.
  • the heater (75), of the fourth aspect of the invention, that is folded longitudinally is placed inside the outdoor heat exchanger (30) through the opening (3a) on the side surface of the outdoor heat exchanger (30) including the four heat exchange surfaces (30a). Then, the heater (75) is expanded inside the outdoor heat exchanger (30). Then, the heater (75) is attached on the outdoor unit (10) along the lower end portion of the outdoor heat exchanger (30).
  • the fifth aspect of the invention provides the outdoor unit, of the fourth aspect of the invention, including compressors (5a, 5b) disposed inside the outdoor heat exchanger (30).
  • the heater (75), of the fifth aspect of the invention, that is folded longitudinally is placed inside the outdoor heat exchanger (30) through the opening (3a) on the side surface of the outdoor heat exchanger (30) including the four heat exchange surfaces (30a). During this time, the heater (75) is not in contact with the compressors (5a, 5b). Then, the heater (75) is expanded inside the outdoor heat exchanger (30) that accommodates the compressors (5a, 5b). Then, the heater (75) is attached on the outdoor unit (10) along the lower end portion of the outdoor heat exchanger (30).
  • the heater (75) is in the shape of a rectangular frame and includes the hinges (70) that allow the heater (75) to fold longitudinally.
  • This configuration allows, for installation in the outdoor unit (10) of the refrigerator, the heater (75) folded longitudinally to be placed inside the outdoor heat exchanger (30) through the opening (3a) disposed on the side surface of the outdoor heat exchanger (30). That is, if the opening (3a) on the side surface of the outdoor heat exchanger (30) is narrow, the heater (75) is still easily placed inside the outdoor heat exchanger (30) without being stuck on the outdoor heat exchanger (30).
  • the folded heater (75) is also expanded after placed inside the outdoor heat exchanger (30).
  • the heater (75) is easily installed along the lower end portion of the outdoor heat exchanger (30) without being stuck on the outdoor heat exchanger (30). This heater for the outdoor unit of the refrigerator is useful for easy installation.
  • the simple configuration allows the heater (75) to fold longitudinally.
  • the heater (75) includes the heating portions (76, 77). These heating portions (76, 77) include the end portions (76b, 77b) connected with the wirings (78, 79) serving as the hinges (70). These end portions (76b, 77b) are bent upward from the bodies (76a, 77a) extending along the bottom board (22) of the casing (20). This configuration prevents the wirings (78, 79) connecting the heating portions (76, 77) from being in contact with the drain water when the heater (75) is attached on the bottom board (22) of the outdoor unit (10).
  • the heater (75) is able to fold longitudinally.
  • the heater (75) is placed inside the outdoor heat exchanger (30) and installed in the outdoor unit (10) without being stuck on the outdoor heat exchanger (30) including the four heat exchange surfaces (30a).
  • the outdoor unit includes the compressors (5a, 5b) disposed inside the outdoor heat exchanger (30).
  • the heater (75) to be installed in this outdoor unit might be stuck on not only the outdoor heat exchanger (30) but also on the compressors (5a, 5b) disposed inside the outdoor heat exchanger (30). Thus, the installation is more complicated.
  • the heater (75) that is able to fold longitudinally is installed in the outdoor unit.
  • the folded heater (75) is placed inside the outdoor heat exchanger (30) through the opening (3a) on the side surface of the outdoor heat exchanger (30).
  • the heater (75) is easily installed along the lower end portion of the outdoor heat exchanger (30) without contact with the compressors (5a, 5b).
  • FIGS. 1-4 illustrate an outdoor unit (10) of the first embodiment.
  • the outdoor unit (10) is connected with an indoor unit (not shown) to operate vapor-compression refrigeration cycles.
  • the outdoor unit (10) is used for an air conditioner serving as a refrigerator.
  • the outdoor unit (10) is installed on, e.g., a rooftop of a building.
  • the outdoor unit (10) includes a casing (20), an outdoor heat exchanger (30), outdoor fans (40), and a compression system (50).
  • the casing (20) is rectangular in plan view.
  • the casing (20) includes four poles (21), a bottom frame (22), side panels (23), and a flat top board (24).
  • the bottom frame (22) serves as a bottom board. That is, the casing (20) includes four side surfaces (4) between the top board (24) and the bottom frame (22). See FIG. 4 .
  • the four poles (21) are disposed in four corners.
  • the four poles (21) each includes a lower part fixed to the bottom frame (22).
  • the left and right poles (21, 21) disposed on a front side of the casing (20) each includes a lower end connected with a foundation leg (27).
  • the left and right poles (21) disposed on a back side of the casing (20) each also includes a lower end connected with another foundation leg (27).
  • the foundation legs (27) each protrudes downward from the bottom frame (22).
  • These foundation legs (27) might be installed on four corners of a flat top board (24) of another casing (20), or upper ends of poles (21) of the another casing (20).
  • These foundation legs (27) allow the plurality of outdoor units (10) to be stacked vertically. This configuration also secures a certain clearance between the flat top board (24) and the bottom frame (22).
  • FIG. 1 illustrates the side panels (23) that include upper side panels (23a), a front side panel (23b), and a lateral side panel (23c).
  • the upper side panels (23a) serve as four upper side surfaces of the casing (20).
  • the front side panel (23b) serves as a lower left portion of a front surface of the casing (20).
  • the lateral side panel (23c) serves as a lower front portion of a left lateral side surface of the casing (20).
  • the casing (20) includes an inlet (25) that is disposed on a lower right portion of the front surface of the casing (20).
  • the casing (20) includes an inlet (25) that is disposed on a lower portion of a right lateral side surface of the casing (20).
  • the casing (20) includes an inlet (25) that is disposed on a lower portion of a back surface of the casing (20).
  • the casing (20) includes an inlet (25) that is disposed on a lower back portion of the left lateral side surface of the casing (20).
  • the four upper side panels (23a) are attached on the poles (21), and surround the outdoor fans (40).
  • the upper side panels (23a) form an upper space (2b), which accommodates the two outdoor fans (40). See FIGS. 2 and 3 .
  • the top board (24) is also fixed to the upper ends of the poles (21).
  • the top board (24) includes two air outlets (26) positioned above the two outdoor fans (40).
  • the air outlet (26) is rectangular in plan view.
  • the air outlet (26) is covered with a mesh grill (24a) that is rectangular.
  • the top board (24) includes installation surfaces for the grills (24a). The installation surface is recessed and positioned below an upper end surface of the top board (24). This configuration prevents the grill (24a) and screws that fasten the grill (24a) to the top board (24) from being positioned above the upper end surface of the top board (24).
  • FIGS. 2-4 illustrate the outdoor heat exchanger (30) that is a fin and tube heat exchanger.
  • the outdoor heat exchanger (30) exchanges heat between outdoor air and a refrigerant.
  • the outdoor heat exchanger (30) includes a plurality of heat transfer tubes that are arranged vertically and pass through plate fins.
  • the heat transfer tubes of the outdoor heat exchanger (30) are bent at a right angle in three points along the four side surfaces (4) of the casing (20).
  • the outdoor heat exchanger (30) is a bent heat exchanger (a rectangular shell heat exchanger) that stands vertically and includes four heat exchange surfaces (30a) corresponding to the four side surfaces (4) of the casing (20). See FIG. 4 .
  • the compression system (50), the oil separator (51), and the accumulator (52) are also attached on the bottom frame (22).
  • the compression system (50) includes two compressors (5a, 5b).
  • the two of the four heat exchange surfaces (30a) include openings (3a, 3a). See FIGS. 2 and 4 .
  • the two openings (3a, 3a) serve as maintenance openings for the machines in the casing (20).
  • Ends of the outdoor heat exchanger (30) each serves the opening (3a).
  • a tube plate (31) is provided on each of the ends of the outdoor heat exchanger (30) in order to fix the outdoor heat exchanger (30) to the casing (20).
  • FIG. 1 illustrates the casing (20) including the front side panel (23b) and the lateral side panel (23c) each corresponding to the opening (3a) of the outdoor heat exchanger (30).
  • the front side panel (23b) and the lateral side panel (23c) serve as lower side panels in a lower portion of the casing (20).
  • the front side panel (23b) and the lateral side panel (23c) are installed on the pole (21a) to freely open or close the openings (3a, 3a).
  • the outdoor heat exchanger (30) includes the opening (3a) on the front side of the casing (20).
  • This front side serves as a service surface.
  • the front side also serves an opening surface where the front side panel (23b) is detached.
  • the opening (3a) that is opened by detaching the front side panel (23b) serves as a service opening through which a heater (75) to be installed passes.
  • the heater (75) will be described later.
  • the casing (20) also includes horizontal stays (20a, 20b, 20c, 20d) on the four surfaces of the casing (20).
  • the stays (20a, 20b, 20c, 20d) are positioned between a lower space (2a) accommodating the outdoor heat exchanger (30) and the upper space (2b) accommodating the outdoor fan (40).
  • the two outdoor fans (40) each includes a rotating member (41), a fan motor (not shown), and a bell mouth (43).
  • the outdoor fans (40) are mounted on the stays (20a, 20c).
  • the casing (20) also accommodates an electrical equipment unit (60) that accommodates electrical equipment for controlling the compression system (50) etc.
  • the electrical equipment unit (60) is disposed above the front surface of the outdoor heat exchanger (30) and near an upper end of the outdoor heat exchanger (30).
  • the electrical equipment unit (60) is also disposed between the upper side panel (23a) and the bell mouth (43) of the outdoor fan (40).
  • the bottom frame (22) includes a compressor cover that covers the compression system (50).
  • This compressor cover serves as a soundproof box for reducing noises produced by vibrations of the compression system (50).
  • the bottom frame (22) also includes a plurality of drain passages (71) (five drain passages in this embodiment) for discharging drain water on the outdoor heat exchanger (30). See FIG. 4 .
  • the drain passages (71) are disposed below the outdoor heat exchanger (30).
  • FIG. 5 illustrates the drain passage (71) that is a recessed channel on the bottom frame (22).
  • the recessed channel includes a bottom (71a) and slopes (71b).
  • the bottom (71a) extends along the outdoor heat exchanger (30).
  • the slopes (71b) are disposed on both sides of the bottom (71a), and extend along the bottom (71a).
  • the bottom (71a) of the drain passage (71) includes a plurality of drain holes (72).
  • the drain passage (71) includes a plurality of platforms (73) that the outdoor heat exchanger (30) stands on.
  • the platform (73) is a raised portion on the drain passage (71).
  • the raised portion includes a stage (73a) and a side (73b).
  • the stage (73a) is flat.
  • the outdoor heat exchanger (30) stands on the stage (73a).
  • the side (73b) is tapered from the drain passage (71) to the stage (73a).
  • the stage (73a) of the platform (73) includes a plurality of drain holes (74).
  • the outdoor heat exchanger (30) stands on the stage (73a) of the platform (73). Screws, for example, engage the tube plates (31) provided on both ends of this outdoor heat exchanger (30) with the casing (20) including the bottom frame (22) so that the outdoor heat exchanger (30) is fixed to the casing (20).
  • FIGS. 4 and 5 also illustrate that the outdoor unit (10) includes the heater (75) for heating drain water on the drain passage (71) to avoid freeze of it.
  • the heater (75) is in the shape of a rectangular frame along lower end portions of the four heat exchange surfaces (30a) of the outdoor heat exchanger (30).
  • FIG. 5 illustrates that the heater (75) is sandwiched between the inside slope (71b) of the drain passage (71) and an inside portion of the tapered side (73b) of the platform (73).
  • FIG. 6 also illustrates that the heater (75) includes two heating portions: a first heating portion (76) and a second heating portion (77). In other words, the heater (75) has a split structure consisting of the two heating portions.
  • the first heating portion (76) is L-shaped along two of the four heat exchange surfaces (30a) of the outdoor heat exchanger (30).
  • One of the two of the four heat exchange surfaces (30a) is a left side surface of the outdoor heat exchanger (30).
  • the other one of the two of the four heat exchange surfaces (30a) is a back surface of the outdoor heat exchanger (30).
  • the second heating portion (77) is U-shaped along three of the four heat exchange surfaces (30a) of the outdoor heat exchanger (30).
  • the first one of the three of the four heat exchange surfaces (30a) is the back surface of the outdoor heat exchanger (30).
  • the second one of the three of the four heat exchange surfaces (30a) is a right side surface of the outdoor heat exchanger (30).
  • the third one of the three of the four heat exchange surfaces (30a) is a front surface of the outdoor heat exchanger (30).
  • the first heating portion (76) includes a body (76a) and end portions (76b).
  • the body (76a) is L-shaped.
  • the end portions (76b) are continuous with the body (76a).
  • the end portions (76b) are bent upward from a plane on which the body (76a) extends.
  • the second heating portion (77) includes a body (77a) and end portions (77b).
  • the body (77a) is U-shaped.
  • the end portions (77b) are continuous with the body (77a).
  • the end portions (77b) are bent upward from a plane on which the body (77a) extends.
  • One of the end portions (76b) of the first heating portion (76) is connected with one of the end portions (77b) of the second heating portion (77) through a connection wiring (78).
  • the other end portion (76b) of the first heating portion (76) is connected with a power connector (80) through a lead wire (79).
  • the other end portion (77b) of the second heating portion (77) is connected with the power connector (80) through another lead wire (79).
  • the first heating portion (76) is connected with the second heating portion (77) through the wirings (78, 79) so that the heater (75) is in the shape of a rectangular frame.
  • the first heating portion (76) is connected with the second heating portion (77) through the wirings (78, 79) so that the first heating portion (76) and the second heating portion (77) are aligned longitudinally.
  • This configuration allows the heater (75) to fold longitudinally.
  • the wirings (78, 79) fold as hinges (70).
  • the hinges (70) fold so that the heater (75) itself folds in two longitudinally.
  • the compression system (50) operates to circulate a refrigerant in a refrigerant circuit between the outdoor unit (10) and an indoor unit (not shown) and create a refrigeration cycle.
  • the outdoor fans (40) rotate in the casing (20) of the outdoor unit (10) to allow the outdoor air to enter the casing (20) through the four inlets (25) disposed in the lower portion of the casing (20). Then, the outdoor air passes through the outdoor heat exchanger (30). This outdoor air exchanges heat with the refrigerant in the outdoor heat exchanger (30). During heating operation, the outdoor air dissipates heat to the refrigerant in the outdoor heat exchanger (30) serving as an evaporator. Thus, the outdoor air is cooled.
  • the outdoor air absorbs heat from the refrigerant in the outdoor heat exchanger (30) serving as a condenser. Thus, the outdoor air is heated. Then, the outdoor air passes through the outdoor fans (40), moves upward, and flows out from the air outlets (26).
  • the heater (75) in the outdoor unit (10) is energized to avoid freeze of the drain water on the outdoor heat exchanger (30).
  • the drain water on the outdoor heat exchanger (30) is dropped downward and received by the drain passages (71) on the bottom frame (22).
  • the drain water flows into the drain passages (71) partly through the drain holes (74) of the platform (73) that the outdoor heat exchanger (30) stands on.
  • the energized heater (75) heats the drain water in the drain passages (71) to avoid freeze.
  • the drain water flows from the drain passage (71) to the outside of the casing (20) thorough the drain holes (72).
  • the heater (75) of this embodiment is energized.
  • the heater (75) may be energized in another operation mode when the outdoor temperature is less than or equal to a predetermined temperature.
  • the heater (75) may also be energized in all the operations.
  • the heater (75) is in the shape of a rectangular frame and includes the hinges (70) that allow the heater (75) to fold longitudinally.
  • This configuration allows, for installation in the outdoor unit (10) of the refrigerator, the heater (75) folded longitudinally to be placed inside the outdoor heat exchanger (30) through the opening (3a) disposed on the side surface of the outdoor heat exchanger (30). That is, if the opening (3a) on the side surface of the outdoor heat exchanger (30) is narrow, the heater (75) is still easily placed inside the outdoor heat exchanger (30) without being stuck on the outdoor heat exchanger (30).
  • the folded heater (75) is also expanded after placed inside the outdoor heat exchanger (30).
  • the heater (75) is easily installed along the lower end portion of the outdoor heat exchanger (30) without being stuck on the outdoor heat exchanger (30). This heater for the outdoor unit of the refrigerator is useful for easy installation.
  • the heater (75) also includes the first heating portion (76) and the second heating portion (77) that are aligned longitudinally.
  • the wirings (78, 79) connecting the first heating portion (76) and the second heating portion (77) also serve as the hinges (70). This simple configuration allows the heater (75) to fold longitudinally.
  • the heater (75) includes the heating portions (76, 77). These heating portions (76, 77) include the end portions (76b, 77b) connected with the wirings (78, 79) serving as the hinges (70). These end portions (76b, 77b) are bent upward from the bodies (76a, 77a) disposed along the bottom frame (22) of the casing (20). This configuration prevents the wirings (78, 79) connecting the heating portions (76, 77) from being in contact with the drain water when the heater (75) is attached on the bottom frame (22) of the outdoor unit (10).
  • the heater (75) is able to fold longitudinally.
  • the heater (75) is placed inside the outdoor heat exchanger (30) and installed in the outdoor unit (10) without being stuck on the outdoor heat exchanger (30) including the four heat exchange surfaces (30a).
  • the outdoor unit (10) of the first embodiment includes the compressors (5a, 5b) disposed inside the outdoor heat exchanger (30).
  • the heater (75) to be installed in this outdoor unit (10) might be stuck on not only the outdoor heat exchanger (30) but also on the compressors (5a, 5b) disposed inside the outdoor heat exchanger (30). Thus, the installation is more complicated.
  • the heater (75) that is able to fold longitudinally is installed in the outdoor unit (10).
  • the folded heater (75) is placed inside the outdoor heat exchanger (30) through the opening (3a) on the side surface of the outdoor heat exchanger (30).
  • the heater (75) is easily installed along the lower end portion of the outdoor heat exchanger (30) without contact with the compressors (5a, 5b).
  • the heater (75) includes the two heating portions (76, 77) connected with each other by the wirings (78, 79).
  • the heater (75) is able to fold in two longitudinally.
  • the heater (75) may be able to fold in three or four.
  • the layout etc. of the refrigerant circuit equipment in the embodiments is only an example, and may be modified if necessary.
  • no compressors (5a, 5b) etc. may be provided inside the outdoor heat exchanger (30).
  • the present invention is useful for a heater for avoiding freeze of drain water, and an outdoor unit including the heater for a refrigerator.
EP12857382.1A 2011-12-12 2012-12-12 Réchauffeur et unité extérieure pour une unité de réfrigération équipée d'un réchauffeur Active EP2792955B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011271295A JP5218629B2 (ja) 2011-12-12 2011-12-12 ヒータ及びそれを備えた冷凍装置の室外ユニット
PCT/JP2012/007949 WO2013088713A1 (fr) 2011-12-12 2012-12-12 Réchauffeur et unité extérieure pour une unité de réfrigération équipée d'un réchauffeur

Publications (3)

Publication Number Publication Date
EP2792955A1 true EP2792955A1 (fr) 2014-10-22
EP2792955A4 EP2792955A4 (fr) 2015-12-02
EP2792955B1 EP2792955B1 (fr) 2016-11-30

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EP12857382.1A Active EP2792955B1 (fr) 2011-12-12 2012-12-12 Réchauffeur et unité extérieure pour une unité de réfrigération équipée d'un réchauffeur

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Country Link
US (1) US20140298844A1 (fr)
EP (1) EP2792955B1 (fr)
JP (1) JP5218629B2 (fr)
KR (1) KR101428444B1 (fr)
CN (1) CN103988026B (fr)
AU (1) AU2012353915B2 (fr)
WO (1) WO2013088713A1 (fr)

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CN110770509A (zh) * 2017-07-31 2020-02-07 大金工业株式会社 制冷机室外单元
EP3690329A1 (fr) * 2019-02-01 2020-08-05 Toshiba Carrier Corporation Unité extérieure pour appareil à cycle de réfrigération

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EP2977696A1 (fr) * 2014-07-25 2016-01-27 Societe Industrielle de Chauffage (SIC) Systeme et procede de gestion des condensats liquides d'un echangeur thermique
FR3024222A1 (fr) * 2014-07-25 2016-01-29 Chauffage Soc Ind De Systeme de gestion des condensats liquides d'un echangeur thermique
CN110770509A (zh) * 2017-07-31 2020-02-07 大金工业株式会社 制冷机室外单元
EP3663659A4 (fr) * 2017-07-31 2020-12-16 Daikin Industries, Ltd. Unité extérieure destinée à un dispositif frigorifique
US11428421B2 (en) 2017-07-31 2022-08-30 Daikin Industries, Ltd. Outdoor unit of refrigeration apparatus
EP3690329A1 (fr) * 2019-02-01 2020-08-05 Toshiba Carrier Corporation Unité extérieure pour appareil à cycle de réfrigération

Also Published As

Publication number Publication date
CN103988026B (zh) 2015-09-02
JP2013122351A (ja) 2013-06-20
AU2012353915B2 (en) 2014-09-25
US20140298844A1 (en) 2014-10-09
CN103988026A (zh) 2014-08-13
WO2013088713A1 (fr) 2013-06-20
KR20140093755A (ko) 2014-07-28
EP2792955A4 (fr) 2015-12-02
KR101428444B1 (ko) 2014-08-07
JP5218629B2 (ja) 2013-06-26
EP2792955B1 (fr) 2016-11-30
AU2012353915A1 (en) 2014-07-17

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