US20160258649A1 - Indoor unit and air-conditioning apparatus - Google Patents

Indoor unit and air-conditioning apparatus Download PDF

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Publication number
US20160258649A1
US20160258649A1 US15/026,998 US201415026998A US2016258649A1 US 20160258649 A1 US20160258649 A1 US 20160258649A1 US 201415026998 A US201415026998 A US 201415026998A US 2016258649 A1 US2016258649 A1 US 2016258649A1
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United States
Prior art keywords
air
indoor unit
flow direction
passage
outlet
Prior art date
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Abandoned
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US15/026,998
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English (en)
Inventor
Kenyu Tanaka
Masahiko Takagi
Makoto Kurihara
Atsushi Kono
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
Publication date
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Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KONO, ATSUSHI, KURIHARA, MAKOTO, TAKAGI, MASAHIKO, TANAKA, KENYU
Publication of US20160258649A1 publication Critical patent/US20160258649A1/en
Abandoned legal-status Critical Current

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Classifications

    • F24F11/0034—
    • 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
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0011—Indoor units, e.g. fan coil units characterised by air outlets
    • F24F1/0014—Indoor units, e.g. fan coil units characterised by air outlets having two or more outlet openings
    • F24F11/0078—
    • 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
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/79—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling the direction of the supplied air
    • 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
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0047—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1413—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre using more than one tilting member, e.g. with several pivoting blades
    • F24F2001/0037—
    • 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
    • F24F2120/00—Control inputs relating to users or occupants
    • F24F2120/10—Occupancy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2120/00—Control inputs relating to users or occupants
    • F24F2120/10—Occupancy
    • F24F2120/12—Position of occupants

Definitions

  • the present invention relates to, for example, an indoor unit included in, for example, an air-conditioning apparatus, and in particular, relates to air blowing (diffusing).
  • a known indoor unit included in, for example, an air-conditioning apparatus has a function of enabling outlet vanes (air flow direction louvers) of the indoor unit to be positioned at an angle beyond, for example, a normal position so that air (blown air) from the indoor unit is not directly blown to a human (see, for example, Patent Literature 1).
  • end part of each outlet vane on a downstream side in an air flow direction (downstream end part) is located at a higher level or position (or closer to a ceiling) than at the normal position. In such a state, the blown air tends to flow more horizontally than a normal air flow direction.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2011-075168 (FIG. 9, for example)
  • the present invention has been made to overcome the above-described disadvantage and is directed to, for example, an indoor unit capable of reducing smudging, for example, if an outlet vane is moved to an upward position so that blown air is not directly applied to a human.
  • the present invention provides an indoor unit comprising: at least one air outlet having formed therein an inner air-passage wall and an outer air-passage wall located at outside of the inner air-passage wall; and at least one air flow direction louver disposed in the air outlet, the air flow direction louver being rotatable about a rotation axis and configured to deflect air blown from the air outlet by an angular position thereof in rotation, wherein while the indoor unit is in an operating state, the outer air-passage wall and the air flow direction louver define therebetween an outer air passage through which the blown air passes, and the inner air-passage wall and the air flow direction louver define therebetween an inner air passage through which the blown air passes, and the air flow direction louver is rotatable to an upward position, being the angular position, at which the outer air passage between the outer air-passage wall and the air flow direction louver is narrowed to have a higher air flow resistance than the inner air passage.
  • the indoor unit according to the present invention allows the air flow direction louver to be moved to the upward position to achieve a comfortable operation such that air is not directly blown to a human.
  • the outer air passage between the air flow direction louver and the outer air-passage wall is narrowed to have a higher air flow resistance than the inner air passage. This reduces the flow velocity and flow rate of the blown air flowing along a room wall, thus reducing smudging.
  • FIG. 1 is a vertical sectional view of an indoor unit 100 according to Embodiment 1 of the present invention.
  • FIG. 2 is a first sectional view illustrating the positional relationship between an air outlet 132 and an outlet vane 150 in Embodiment 1 of the present invention.
  • FIG. 3 is a second sectional view illustrating the positional relationship between the air outlet 132 and the outlet vane 150 in Embodiment 1 of the present invention.
  • FIG. 4 is a third sectional view illustrating the positional relationship between the air outlet 132 and the outlet vane 150 in Embodiment 1 of the present invention.
  • FIG. 5 shows an exterior of an indoor unit 100 according to Embodiment 2 of the present invention.
  • FIG. 6 is a diagram illustrating an exemplary configuration of an air-conditioning apparatus according to Embodiment 4 of the present invention.
  • FIG. 1 is a vertical sectional view of an indoor unit 100 according to Embodiment 1 of the present invention.
  • the indoor unit 100 according to Embodiment 1 has a ceiling-embedding structure that can be embedded or concealed in the ceiling of a room, and is also of a four-way cassette type having air outlets in four directions.
  • the indoor unit 100 will now be described.
  • the indoor unit 100 is connected to an outdoor unit by refrigerant pipes to form a refrigerant circuit through which refrigerant is circulated for, for example, refrigeration or air conditioning.
  • the indoor unit 100 includes a casing 120 that includes a top panel 121 and a side panel 122 .
  • the indoor unit 100 is concealed in the ceiling of a room and is installed such that the top panel 121 is located at an upper side.
  • the casing 120 itself opens to the room (or opens downward).
  • a decorative panel 130 which is substantially rectangular in plan view, is attached to lower part of the indoor unit 100 such that the decorative panel 130 faces the room.
  • the decorative panel 130 includes a grille 131 and a filter 140 at substantially center part of the decorative panel 130 .
  • the grille 131 serves as an air inlet through which air is taken into the indoor unit 100 .
  • the filter 140 removes dust from air passed through the grille 131 .
  • the indoor unit 100 has a main-body air inlet 123 , through which air is allowed to flow into the main body of the indoor unit 100 , located at central part of a lower surface of the indoor unit 100 .
  • the indoor unit 100 further has a main-body air outlet 124 , through which air is allowed to flow out of the main body, located around the main-body air inlet 123 .
  • the grille 131 , the main-body air inlet 123 , the main-body air outlet 124 , and air outlets 132 communicate with one another, thus defining an air passage in the indoor unit 100 .
  • the indoor unit 100 includes in the main body a turbo fan 170 , a bell mouth 160 , a fan motor 180 , and an indoor heat exchanger 110 .
  • the turbo fan 170 is a centrifugal blower device having its rotation axis extending vertically. The turbo fan 170 blows air, sucked through the grille 131 , laterally (lateral direction in FIG. 1 ) to produce a flow of air.
  • the turbo fan 170 is used as an blower device in Embodiment 1, any other blower device, such as a sirocco fan or a radial fan, may be used in the present invention.
  • the bell mouth 160 defines an inlet air passage for the turbo fan 170 and rectifies an air flow.
  • the fan motor 180 rotates and drives the turbo fan 170 .
  • the indoor heat exchanger 110 of, for example, a finned tube type is disposed downstream of the turbo fan 170 such that the indoor heat exchanger 110 surrounds the turbo fan 170 .
  • the indoor heat exchanger 110 functions as an evaporator in a cooling operation and functions as a condenser in a heating operation.
  • the air outlets 132 are arranged at respective sides of the decorative panel 130 such that each of the air outlets 132 extends along the corresponding side.
  • the indoor unit 100 according to Embodiment 1 has four air outlets 132 .
  • the indoor unit 100 further includes an outlet vane (flap) 150 disposed in each of the air outlets 132 .
  • the outlet vane 150 serves as an air flow direction louver that changes an air flow direction.
  • Each outlet vane 150 is rotated or moved about a rotation axis 151 by driving of a motor (not illustrated), so that the outlet vane 150 is positioned.
  • the indoor unit 100 further includes a controller 190 configured to control operations of the components of the indoor unit 100 .
  • the controller 190 drives and controls the motors connected to the outlet vanes 150 to position each of the outlet vanes 150 .
  • FIGS. 2 to 4 are sectional views illustrating the positional relationship between the air outlet 132 and the outlet vane 150 in Embodiment 1 of the present invention.
  • FIG. 2 illustrates the positional relationship in a normal mode.
  • FIG. 3 illustrates the positional relationship in a direct air-blowing avoidance mode in which an air flow (blown air) is not directly blown to a human.
  • FIG. 4 illustrates the positional relationship in a non-operating state.
  • the air outlet 132 includes an inner air-passage wall 132 B adjacent to the grille 131 (or closer to the center of the indoor unit 100 ) and an outer air-passage wall 132 A adjacent to an outer frame of the decorative panel 130 (or farther from the center of the indoor unit 100 ).
  • the inner air-passage wall 132 B and the outlet vane 150 define therebetween an inner air passage through which the blown air passes.
  • the outer air-passage wall 132 A and the outlet vane 150 define therebetween an outer air passage through which the blown air passes
  • the indoor unit 100 according to Embodiment 1 is configured such that end part (downstream end part) of the outlet vane 150 located on a downstream side in a flow direction of the blown air overlaps the outer air-passage wall 132 A when the indoor unit 100 is viewed from below.
  • the outlet vane 150 does not completely close the air outlet 132 such that the outlet vane 150 and the inner air-passage wall 132 B form a clearance therebetween.
  • a clearance of approximately 8.73 mm is left between the outlet vane 150 and the inner air-passage wall 132 B.
  • the rotation axis 151 of the outlet vane 150 is accordingly located closer to the outer air-passage wall 132 A.
  • the outlet vane 150 overlaps the outer air-passage wall 132 A by a small extent (for example, approximately 2.15 mm) in the positional relationship between the air outlet 132 and the outlet vane 150 in the normal mode.
  • the clearance between the outlet vane 150 and the inner air-passage wall 132 B is the largest (for example, approximately 12.4 mm). This results in a low air flow resistance, thus facilitating flowing of the blown air.
  • the outer air passage between the outlet vane 150 and the outer air-passage wall 132 A is narrowed, thus increasing the air flow resistance. This reduces the flow velocity of the blown air flowing along the ceiling.
  • the inner air passage between the outlet vane 150 and the inner air-passage wall 132 B is left (by approximately 9.22 mm, for example) without being closed, thus allowing the blown air to flow through the inner air passage.
  • the controller 190 determines, based on instruction information contained in the signal, which outlet vane 150 of the outlet vanes 150 included in the indoor unit 100 is to be moved. The controller 190 then permits the determined outlet vane 150 to be moved to a position (at which direct air-blowing avoidance is achieved; hereinafter, referred to as an “upward position”) at a predetermined angle at which air flows substantially horizontally (upwardly) as compared with the air flow direction provided by the outlet vane 150 in the normal mode. In this process, an edge (outer edge) of the outlet vane 150 is moved upward relative to that in the normal mode, so that the outer edge comes close to the outer air-passage wall 132 A.
  • the blown air passing through the inner air passage between the outlet vane 150 and the inner air-passage wall 132 B also flows in the vicinity of a design surface (facing the room) of the outlet vane 150 .
  • a design surface facing the room
  • the air-conditioning apparatus is performing the cooling operation, therefore, room air warmer than the blown air will not contact the outlet vane 150 . Consequently, the room air can be prevented from being cooled by the outlet vane 150 (in particular, the design surface thereof) upon coming into contact with the outlet vane 150 , thus preventing condensation on the outlet vane 150 .
  • part of the blown air passing through the inner air passage between the outlet vane 150 and the inner air-passage wall 132 B flows through the grille 131 into the indoor unit 100 . Consequently, the blown air is not directly blown to a human, thus achieving comfort.
  • the indoor unit 100 inhibits all of the (four in Embodiment 1) outlet vanes 150 from being at the upward position at the same time.
  • the controller 190 determines that direct air-blowing avoidance instructions are given in association with more than a predetermined number of outlet vanes 150 , the controller 190 allows a display unit included in, for example, the remote control to display a message indicative of failed direct air-blowing avoidance.
  • the indoor unit 100 may inhibit all of the outlet vanes 150 from being simultaneously located at the upward position.
  • the controller 190 may reduce the rotation speed of the turbo fan 170 (fan motor 180 ) to regulate the air flow rate, If, for example, an instruction can be given to a compressor included in an outdoor unit, for example, the controller 190 may reduce the rotation speed of the compressor in the refrigerant circuit to regulate a supply capacity.
  • the indoor unit 100 allows a designated outlet vane 150 to be at the upward position, thus achieving a comfortable operation in which air is not directly blown to a human.
  • part of the outlet vane 150 overlapping the outer air-passage wall 132 A is increased, and the outer air passage is accordingly narrowed.
  • the flow velocity and flow rate of the blown air through the outer air passage between the outlet vane 150 and the outer air-passage wall 132 A are reduced, so that the flow of the blown air is reduced. This results in a reduction in area of the blown air flow along the ceiling.
  • a large amount of blown air flows through the inner air passage defined between the outlet vane 150 and the inner air-passage wall 132 B.
  • inhibiting more than a predetermined number of outlet vanes 150 of the indoor unit 100 from being simultaneously located at the upward position can eliminate, for example, an increase in load on the turbo fan 170 (fan motor 180 ). This can prevent damage to the turbo fan 170 (fan motor 180 ), thus increasing reliability.
  • FIG. 5 is a perspective view of an indoor unit 100 according to Embodiment 2 of the present invention.
  • components designated by the same reference numerals as those in FIGS. 1 to 4 operate or act in a manner similar to those described in Embodiment 1.
  • a human presence sensor 191 is a sensor (detector) detecting the presence or absence of an occupant or human in, for example, a room.
  • the controller 190 controls the components in the indoor unit 100 .
  • the controller 190 determines, based on a signal transmitted from the human presence sensor 191 , the presence or absence of a human.
  • the controller 190 determines the position of the human.
  • the controller 190 determines, based on the determined position, an outlet vane 150 to be moved, adjusts the angle of the outlet vane 150 , and permits the outlet vane 150 to be moved (rotated) to the upward position.
  • a designated outlet vane 150 of the four outlet vanes 150 of the indoor unit 100 is moved to the upward position in accordance with a signal indicative of a direct air-blowing avoidance instruction transmitted from the remote control.
  • the indoor unit 100 according to Embodiment 2 includes the human presence sensor 191 .
  • the controller 190 automatically determines an outlet vane 150 to be moved to the upward position in accordance with a result of detection by the human presence sensor 191 , and controls the position of the outlet vane 150 to avoid direct air application.
  • Data associated with each of the outlet vanes 150 and indicative of a defined area where air blown through the outlet vane 150 is directly applied to a human is stored in a storage unit (not illustrated) included in, for example, the controller 190 .
  • the controller 190 determines the position of a human in accordance with a result of detection by the human presence sensor 191 .
  • the controller 190 permits the outlet vane 150 corresponding to the area to be moved to the upward position.
  • the indoor unit 100 includes the human presence sensor 191 , and the controller 190 permits an outlet vane 150 determined in accordance with a result of detection by the human presence sensor 191 to be moved to the upward position.
  • the controller 190 permits an outlet vane 150 determined in accordance with a result of detection by the human presence sensor 191 to be moved to the upward position.
  • any of the outlet vanes 150 is moved to avoid direct air application. This movement is not limited to that for direct air-blowing avoidance.
  • air blown from a certain air outlet 132 may interfere with air blown from a neighboring air outlet 132 . This interference may cause, for example, uneven room temperature distribution.
  • the outlet vane 150 in one of these air outlets 132 can be moved to eliminate the interference between blown air flows.
  • FIG. 6 is a diagram illustrating an exemplary configuration of an air-conditioning apparatus according to Embodiment 4 of the present invention.
  • FIG. 6 illustrates the air-conditioning apparatus as an example of a refrigeration cycle apparatus.
  • the air-conditioning apparatus of FIG. 6 includes an outdoor unit 200 and an indoor unit 100 connected by a gas refrigerant pipe 300 and a liquid refrigerant pipe 400 .
  • the outdoor unit 200 includes a compressor 210 , a four-way valve 220 , an outdoor heat exchanger 230 , and an expansion valve 240 .
  • the compressor 210 compresses sucked refrigerant and discharges the refrigerant.
  • the compressor 210 may be, but not limited to, capable of changing its operation frequency to any value by using, for example, an inverter circuit, to change the capacity (amount of refrigerant sent per unit time) of the compressor 210 .
  • the four-way valve 220 is a valve switching between, for example, a refrigerant flow direction in the cooling operation and a refrigerant flow direction in the heating operation.
  • the outdoor heat exchanger 230 in Embodiment 4 exchanges heat between the refrigerant and air (outdoor air).
  • the outdoor heat exchanger 230 functions as an evaporator in the heating operation to evaporate and gasify the refrigerant, and functions as a condenser in the cooling operation to condense and gasify the refrigerant.
  • the expansion valve 240 reduces the pressure of the refrigerant to expand the refrigerant.
  • the expansion valve 240 is an electronic expansion valve
  • the opening degree of the expansion valve 240 is controlled in accordance with an instruction from, for example, the above-described controller 190 .
  • the indoor heat exchanger 110 exchanges heat between the refrigerant and, for example, air to be conditioned.
  • the indoor heat exchanger 110 functions as a condenser in the heating operation to condense and liquefy the refrigerant, and functions as an evaporator in the cooling operation to evaporate and gasify the refrigerant.
  • the four-way valve 220 is switched to provide a connection indicated by full lines.
  • High temperature, high pressure gas refrigerant, compressed and discharged by the compressor 210 passes through the four-way valve 220 and flows into the outdoor heat exchanger 230 .
  • the refrigerant exchanges heat with outdoor air, and thus condenses and liquefies.
  • the condensed and liquefied refrigerant (liquid refrigerant) flows into the expansion valve 240 .
  • the pressure of the refrigerant is reduced by the expansion valve 240 , so that the refrigerant turns into two-phase gas-liquid refrigerant.
  • the refrigerant then flows out of the outdoor unit 200 .
  • the two-phase gas-liquid refrigerant that has flowed out of the outdoor unit 200 passes through the liquid refrigerant pipe 400 and flows into the indoor unit 100 .
  • the refrigerant is distributed by a distributor and flow control capillary tubes (not illustrated) and then flows into the indoor heat exchanger 110 .
  • the refrigerant exchanges heat with, for example, air to be conditioned, and thus evaporates and gasifies.
  • the evaporated and gasified refrigerant then flows out of the indoor unit 100 .
  • the gas refrigerant that has flowed out of the indoor unit 100 passes through the gas refrigerant pipe 300 and flows into the outdoor unit 200 .
  • the refrigerant passes through the four-way valve 220 and is again sucked into the compressor 210 .
  • the refrigerant is circulated through the air-conditioning apparatus in the above-described manner, thus achieving air conditioning (cooling).
  • the four-way valve 220 is switched to provide a connection indicated by dotted lines.
  • High temperature, high pressure gas refrigerant, compressed and discharged by the compressor 210 passes through the four-way valve 220 and flows out of the outdoor unit 200 .
  • the gas refrigerant that has flowed out of the outdoor unit 200 passes through the gas refrigerant pipe 300 and flows into the indoor unit 100 .
  • the refrigerant While passing through the indoor heat exchanger 110 , the refrigerant exchanges heat with, for example, air to be conditioned, and thus condenses and liquefies.
  • the refrigerant passes through the distributor and the flow control capillary tubes (not illustrated) and then flows out of the indoor unit 100 .
  • the refrigerant that has flowed out of the indoor unit 100 passes through the liquid refrigerant pipe 400 and flows into the outdoor unit 200 .
  • the pressure of the refrigerant is reduced by the expansion valve 240 , so that the refrigerant turns into two-phase gas-liquid refrigerant.
  • the refrigerant then flows into the outdoor heat exchanger 230 . While passing through the outdoor heat exchanger 230 , the refrigerant exchanges heat with outdoor air, and thus evaporates and gasifies.
  • the evaporated and gasified (liquid refrigerant) passes through the four-way valve 220 and is again sucked into the compressor 210 .
  • the refrigerant is circulated through the air-conditioning apparatus in the above-described manner, thus achieving air conditioning (heating).
  • the air-conditioning apparatus (refrigeration cycle apparatus) according to Embodiment 4 includes the above-described indoor unit 100 , and can accordingly achieve direct air-blowing avoidance and reduce smudging.
  • the indoor unit 100 has the four air outlets 132 and the four outlet vanes 150 , namely, it is of the four-way cassette type that blows air in four ways.
  • the present invention can be applied to any other ceiling concealed indoor unit for producing, for example, two-way or three-way air flows.
  • the present invention can be applied to any other type of indoor unit. In addition to smudging on a ceiling, therefore, smudging on any indoor wall other than the ceiling can be reduced by appropriately installing the indoor unit.
  • any number of air outlets 132 and any number of outlet vanes 150 may be arranged.
  • the air-conditioning apparatus has been described as an example of a refrigeration cycle apparatus.
  • the present invention can be applied to any other refrigeration cycle apparatus, such as a refrigerator or a freezer.
  • the present invention can be applied to, for example, an blower device and a ventilating device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Air Conditioning Control Device (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
  • Duct Arrangements (AREA)
  • Air-Flow Control Members (AREA)
US15/026,998 2013-12-13 2014-10-06 Indoor unit and air-conditioning apparatus Abandoned US20160258649A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2013-257951 2013-12-13
JP2013257951A JP6157339B2 (ja) 2013-12-13 2013-12-13 室内機及び空気調和装置
PCT/JP2014/076657 WO2015087606A1 (ja) 2013-12-13 2014-10-06 室内機及び空気調和装置

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US15/026,998 Abandoned US20160258649A1 (en) 2013-12-13 2014-10-06 Indoor unit and air-conditioning apparatus

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CN111706965A (zh) * 2020-05-28 2020-09-25 青岛海尔空调器有限总公司 用于空调的防地板凝露的方法及装置、空调
CN114593511A (zh) * 2021-11-29 2022-06-07 青岛海尔空调器有限总公司 用于控制空调出风角度的方法及装置、终端设备

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WO2015087606A1 (ja) 2015-06-18
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