Ceiling-type air conditioner

Abstract

The present invention relates to a ceiling-type air conditioner. A ceiling-type air conditioner according to an embodiment of the present invention may comprise a first suction unit and a second suction unit that are capable of differently adjusting a suction opening degree according to an operation mode. The air conditioner includes a control unit that opens the first suction unit and closes the second suction unit when operating in a cooling mode. Air sucked through the first suction unit during the operation in the cooling mode can improve the cooling effect of the air while passing through a first heat exchanger and a second heat exchanger which operate as evaporators.

Description

Ceiling-mounted air conditioner

[0001] The present invention relates to a ceiling-type air conditioner.

[0002] An air conditioner is a device that maintains the air in a given space at the most suitable condition for its intended use. Typically, the air conditioner includes a compressor, a condenser, an expansion device, and an evaporator, and operates a refrigeration cycle that compresses, condenses, expands, and evaporates a refrigerant, thereby cooling or heating the given space.

[0003] The above-mentioned designated space may be proposed in various ways depending on the location where the air conditioner is used. For example, if the air conditioner is placed in a home or office, the above-mentioned designated space may be an indoor space of the home or building.

[0004] When the air conditioner performs cooling operation, the outdoor heat exchanger provided in the outdoor unit functions as a condenser, and the indoor heat exchanger provided in the indoor unit functions as an evaporator. On the other hand, when the air conditioner performs heating operation, the indoor heat exchanger functions as a condenser, and the outdoor heat exchanger functions as an evaporator.

[0005] Depending on the installation location, air conditioners can be classified into upright, wall-mounted, or ceiling-mounted types. The upright air conditioner is an air conditioner that is installed to stand up in an indoor space, and the wall-mounted air conditioner is understood to be an air conditioner that is installed to be attached to a wall. In addition, the ceiling-mounted air conditioner is understood to be an air conditioner that is installed on a ceiling.

[0006] The air conditioner may include a cooling mode and a dehumidifying mode as its operating modes.

[0007] Cooling mode can be understood as a mode that sucks in indoor air, cools it, and then expels it, while dehumidifying mode can be understood as a mode that sucks in indoor air, lowers its humidity, and then expels it.

[0008] When the above dehumidification mode was implemented, the refrigeration cycle operated, resulting in a decrease in humidity and a drop in the temperature of the discharged air. Ultimately, users experienced unwanted cooling, resulting in discomfort.

[0009] An embodiment of the present invention aims to provide a ceiling-type air conditioner that can maintain the temperature of air discharged during dehumidification mode operation at a constant level by improving the arrangement structure of internal components provided in the indoor unit.

[0010] An embodiment of the present invention aims to provide a ceiling-type air conditioner capable of operating in different modes by separating an indoor heat exchanger into two heat exchangers and placing a fan between the two separated heat exchangers.

[0011] An embodiment of the present invention aims to provide a ceiling-type air conditioner capable of improving a constant-temperature dehumidification effect by configuring a flow path so that, when operating in a dehumidification mode, some of the air sucked in bypasses the first heat exchanger among two separated heat exchangers and passes only through the second heat exchanger.

[0012] The ceiling-type air conditioner according to the present embodiment may include a first suction unit and a second suction unit that can adjust the suction opening differently depending on the operation mode.

[0013] The above air conditioner includes a control unit that opens a first suction part and closes a second suction part when operating in a cooling mode, and during the operation in the cooling mode, air sucked through the first suction part passes through a first heat exchanger and a second heat exchanger that operate as evaporators, thereby improving the cooling effect of the air.

[0014] The above control unit opens both the first suction unit and the second suction unit during the dehumidification mode operation, and during the dehumidification mode operation, the first flow of air sucked through the second suction unit bypasses the second heat exchanger, and the second flow of air sucked through the first suction unit is cooled in the second heat exchanger, so that the first flow and the second flow can be combined at the suction side of the fan.

[0015] When the above dehumidification mode is operated, the control unit can control the refrigeration cycle so that the first heat exchanger acts as a condenser and the second heat exchanger acts as an evaporator.

[0016] The above first suction unit may constitute a main suction unit, and the above second suction unit may constitute a bypass suction unit.

[0017] The above second suction unit can be arranged on both sides of the above first suction unit.

[0018] The second suction portion may be formed in multiple numbers, and the first suction portion may be formed between the multiple second suction portions.

[0019] The first suction part and the second suction part can be separated by a partition so that they do not communicate with each other.

[0020] The air conditioner may include a casing that accommodates first and second heat exchangers and a front panel provided on the front of the casing and forming the first suction portion and the second suction portion.

[0021] A bypass path connected to the second suction unit may be provided inside the above casing.

[0022] The above bypass path can be formed by a duct or a path plate.

[0023] The above bypass path can be extended laterally of the second heat exchanger to bypass the second heat exchanger.

[0024] The above bypass path can extend from the second suction portion to the space between the first heat exchanger and the second heat exchanger to bypass the second heat exchanger.

[0025] A space in which a fan is installed is formed between the first heat exchanger and the second heat exchanger, and a bypass path can be connected to the second suction part so that air passing through the second heat exchanger through the first suction part and air passing through the bypass path are combined at the suction side of the fan.

[0026] As another embodiment, the front panel includes a first suction part and a second suction part for sucking air, and a discharge part for sucking air, and the first suction part can be formed between the second suction part and the discharge part.

[0027] To separate the flow of the first suction unit and the second suction unit, the bypass flow path may include a suction partition that divides the first and second suction units.

[0028] In one aspect of the present invention, a ceiling-type air conditioner may include a casing embedded in a ceiling and having an indoor unit fan; a first heat exchanger and a second heat exchanger provided inside the casing; a front panel provided on one side of the casing and forming an intake portion for sucking air into at least one of the first heat exchanger and the second heat exchanger; and a bypass device forming a bypass path to restrict air from flowing into the second heat exchanger among the first and second heat exchangers.

[0029] The above suction unit may include a first suction unit that sends air to the second heat exchanger; and a second suction unit that is connected to the bypass device and sucks in air that bypasses the second heat exchanger.

[0030] It includes a space portion forming a space between the first heat exchanger and the second heat exchanger, and the indoor unit fan can be installed in the space portion.

[0031] The second heat exchanger may be installed on the suction side of the indoor unit fan, and the first heat exchanger may be installed on the discharge side of the indoor unit fan.

[0032] The front panel further includes a discharge portion that discharges air passing through the indoor unit fan into the indoor space, and the second heat exchanger may be arranged inside the first suction portion and the discharge portion may be arranged on the discharge side of the first heat exchanger.

[0033] The casing further includes a heat exchanger support that supports the first heat exchanger or the second heat exchanger, and the first heat exchanger and the second heat exchanger can be arranged at an angle with respect to the heat exchanger support.

[0034] A first expansion device provided on the inlet side of the first heat exchanger and capable of adjusting the opening to depressurize the refrigerant may be further included; and a second expansion device provided on the inlet side of the second heat exchanger and capable of adjusting the opening to depressurize the refrigerant.

[0035] It further includes a refrigerant pipe connecting the first heat exchanger and the second heat exchanger, and the second heat exchanger can be connected in series to the first heat exchanger through the refrigerant pipe.

[0036] It further includes a suction vane for opening or closing the second suction portion and a control unit for controlling the suction vane and the indoor unit fan, wherein the control unit can control the suction vane to close the second suction portion when operating in a cooling mode and control the suction vane to open the second suction portion when operating in a dehumidifying mode.

[0037] The bypass device includes a duct forming the bypass path, and the duct can extend along the outside of the second heat exchanger from the second suction portion to the space between the first and second heat exchangers.

[0038] The duct may include a bypass suction portion forming one end of the duct and connected to the second suction portion; and a bypass discharge portion forming the other end of the duct and discharging air into a space between the first heat exchanger and the second heat exchanger.

[0039] The cross-sectional area of ​​the above bypass discharge portion may be formed smaller than the cross-sectional area of ​​the above bypass suction portion.

[0040] The bypass device includes a first bypass device and a second bypass device provided on both sides of the first suction unit, and further includes a space in which air passing through the first bypass device and the second bypass device is combined, and the indoor unit fan can be installed in the space.

[0041] The front panel further includes a discharge unit that discharges air passing through the indoor unit fan into the indoor space, and the second suction unit, the first suction unit, and the discharge unit can be arranged sequentially toward one direction of the front panel.

[0042] From another perspective, a ceiling-type air conditioner may include a casing that is embedded in the ceiling and has an indoor unit fan; a first heat exchanger that is provided inside the casing and is provided on the discharge side of the indoor unit fan; and a second heat exchanger that is provided inside the casing and is provided on the suction side of the indoor unit fan.

[0043] The above ceiling-type air conditioner may further include a front panel that covers the inside of the casing and includes a first suction part that sucks in air toward the second heat exchanger and a second suction part that sucks in air that bypasses the second heat exchanger.

[0044] The above ceiling-type air conditioner may include a duct that is connected to the second suction portion and extends along the side of the second heat exchanger to bypass the second heat exchanger, and the duct may include a bypass discharge portion that discharges air into a space between the first heat exchanger and the second heat exchanger.

[0045] The above indoor unit fan can be installed in the above space.

[0046] The first heat exchanger and the second heat exchanger may be connected in series by a refrigerant pipe so that the refrigerant passing through the second heat exchanger flows into the first heat exchanger.

[0047] The device further includes a suction vane for opening or closing the second suction portion, and the control unit can control the suction vane to close the second suction portion when operating in a cooling mode and to open the second suction portion when operating in a dehumidifying mode.

[0048] According to an embodiment of the present invention, by improving the arrangement structure of internal components provided in an indoor unit, the temperature of air discharged during dehumidification mode operation can be maintained constant.

[0049] According to an embodiment of the present invention, by separating the indoor heat exchanger into two heat exchangers and placing a fan between the two separated heat exchangers, the operating mode can be easily changed for each mode.

[0050] According to an embodiment of the present invention, when operating in dehumidification mode, a flow path is configured so that some of the air sucked in bypasses the first heat exchanger among the two separated heat exchangers and passes only through the second heat exchanger, thereby improving the constant temperature dehumidification effect.

[0051] FIG. 1 is a cycle diagram showing the configuration of a ceiling-type air conditioner according to a first embodiment of the present invention.

[0052] Figure 2 is a front view showing the configuration of a ceiling-type air conditioner according to the first embodiment of the present invention.

[0053] Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2.

[0054] Fig. 4 is a front view showing the arrangement of internal components of a ceiling-type air conditioner according to the first embodiment of the present invention.

[0055] Figure 5 is a cross-sectional view taken along line 5-5 of Figure 4.

[0056] FIG. 6a is a cycle diagram showing the refrigerant flow pattern when the ceiling-type air conditioner according to the first embodiment of the present invention is operated in cooling mode.

[0057] Figure 6b is a front view showing the air flow when the ceiling-type air conditioner according to the first embodiment of the present invention is operated in cooling mode.

[0058] Figure 7a is a cycle diagram showing the refrigerant flow pattern when the ceiling-type air conditioner according to the first embodiment of the present invention is operated in the dehumidification mode.

[0059] Figure 7b is a front view showing the air flow when the ceiling-type air conditioner according to the first embodiment of the present invention is operated in dehumidification mode.

[0060] Fig. 8 is a cross-sectional view showing the configuration of a ceiling-type air conditioner according to a second embodiment of the present invention and the air flow during cooling mode operation.

[0061] Fig. 9 is a cross-sectional view showing the configuration of a ceiling-type air conditioner according to a second embodiment of the present invention and the air flow during dehumidification mode operation.

[0062] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. When designating components in each drawing, it should be noted that, where possible, identical components will be given the same reference numerals, even if they appear in different drawings. Furthermore, when describing embodiments of the present invention, detailed descriptions of related known structures or functions will be omitted if they are deemed to hinder understanding of the embodiments of the present invention.

[0063] Additionally, terms such as first, second, A, B, (a), (b), etc. may be used to describe components of embodiments of the present invention. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by the terms. When it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but another component may also be "connected," "coupled," or "connected" between each component.

[0064] FIG. 1 is a cycle diagram showing the configuration of a ceiling-type air conditioner according to a first embodiment of the present invention.

[0065] Referring to FIG. 1, a ceiling-type air conditioner (10, hereinafter referred to as an air conditioner) according to a first embodiment of the present invention may include a plurality of components constituting a refrigeration cycle and a refrigerant pipe (101) that connects the plurality of components and guides the flow of refrigerant.

[0066] The above air conditioner (10) may include a compressor (110) that compresses refrigerant.

[0067] The above refrigerant pipe (101) is provided on the discharge side of the compressor (110) and may include a discharge pipe (101a) that guides the refrigerant compressed in the compressor (110) to the condenser (120).

[0068] A gas-liquid separator (150) may be connected to the suction side of the compressor (110). The gas-liquid separator (150) may be configured to filter out liquid refrigerant among the refrigerant sucked into the compressor (110) and send the separated gas-phase refrigerant to the compressor (110).

[0069] The above refrigerant pipe (101) may include a low-pressure pipe (101d) in which the gas-liquid separator (150) is installed.

[0070] The refrigerant compressed in the compressor (110) is discharged through the discharge pipe (101a) and can be introduced into the condenser (120) through the discharge pipe (101a). The discharge pipe (101a) can be connected to the inlet side of the condenser (120).

[0071] A condensation fan (125) may be installed on one side of the condenser (120). The condensation fan (125) may blow air into the condenser (120).

[0072] For example, the condenser (120) may be configured as an outdoor heat exchanger of the outdoor unit. At this time, the condensation fan (125) is configured as an outdoor unit fan and can perform heat exchange by blowing outside air into the condenser (120).

[0073] The above refrigerant pipe (101) may include a condensation pipe (101b) connected to the outlet side of the condenser (120). High-pressure liquid refrigerant condensed in the condenser (120) may flow through the condensation pipe (101b).

[0074] For example, the condensation pipe (101b) may constitute at least a portion of the pipe connecting the outdoor unit and the indoor unit.

[0075] The above condensation pipe (101b) can be connected to an indoor unit (200, see FIG. 2).

[0076] The above air conditioner (10) may include a first heat exchanger (141) connected to the condensation pipe (101b). The condensed refrigerant flowing through the condensation pipe (101b) may flow to the first heat exchanger (141).

[0077] The above air conditioner (10) may include a first expansion device (131) provided on the inlet side of the first heat exchanger (141). The refrigerant flowing through the condensation pipe (101b) may flow into the first heat exchanger (141) after passing through the first expansion device (131).

[0078] The above first expansion device (131) can be installed inside the indoor unit (200).

[0079] The above first expansion device (131) may be configured as an electronic expansion valve (EEV) whose opening can be adjusted. The degree of pressure reduction of the refrigerant can be adjusted according to the opening adjustment of the first expansion device (131).

[0080] When the cooling mode is performed among the operation modes of the air conditioner (10), the opening of the first expansion device (131) can be adjusted so that the pressure of the refrigerant can be reduced. Accordingly, the refrigerant flowing through the condensation pipe (101b) can be reduced to a low pressure while passing through the first expansion device (131), and the reduced pressure refrigerant can be heat exchanged (evaporated) in the first heat exchanger (141). At this time, the first heat exchanger (141) can function as an evaporator.

[0081] When the dehumidification mode is performed among the operation modes of the air conditioner (10), the first expansion device (131) is fully open so that the refrigerant can pass through the first expansion device (131) without being decompressed. Accordingly, the refrigerant flowing through the condensation pipe (101b) can pass through the first expansion device (131) and undergo heat exchange (condensation) in the first heat exchanger (141). At this time, the first heat exchanger (141) can function as a condenser.

[0082] The above air conditioner (10) may further include a second heat exchanger (142) arranged on the outlet side of the first heat exchanger (141). The first heat exchanger (141) and the second heat exchanger (142) may be connected in series.

[0083] The above refrigerant pipe (101) may include an intermediate pipe (101c) connected to the outlet side of the first heat exchanger (141). The intermediate pipe (101c) may be connected to the inlet side of the second heat exchanger (142). The intermediate pipe (101c) may connect between the first heat exchanger (141) and the second heat exchanger (142), and may cause the refrigerant passing through the first heat exchanger (141) to be introduced into the second heat exchanger (142).

[0084] The above air conditioner (10) may further include a second expansion device (135) installed in the intermediate pipe (101c). The refrigerant flowing through the intermediate pipe (101c) may pass through the second expansion device (135) and then flow into the second heat exchanger (142).

[0085] The above second expansion device (135) can be installed inside the indoor unit (200).

[0086] The above second expansion device (135) may be configured as an electronic expansion valve (EEV) whose opening can be adjusted. The degree of depressurization of the refrigerant can be adjusted according to the opening adjustment of the second expansion device (135).

[0087] When the cooling mode is performed among the operation modes of the air conditioner (10), the second expansion device (135) is fully open so that the refrigerant can pass through the second expansion device (135) without being decompressed. Accordingly, the refrigerant evaporated in the first heat exchanger (141) can be further evaporated while passing through the second heat exchanger (142). Accordingly, the second heat exchanger (142) can function as an evaporator.

[0088] When the dehumidification mode is performed among the operation modes of the air conditioner (10), the opening of the second expansion device (135) can be adjusted so that the pressure of the refrigerant can be reduced. Accordingly, the refrigerant condensed in the first heat exchanger (141) and flowing through the intermediate pipe (101c) can be reduced in pressure while passing through the second expansion device (135). The refrigerant reduced in pressure in the second expansion device (135) can be introduced into the second heat exchanger (142) and heat exchanged (evaporated). Accordingly, the second heat exchanger (142) can function as an evaporator.

[0089] A fan (145, hereinafter referred to as an indoor unit fan) for blowing air may be provided on one side of the first heat exchanger (141) and the second heat exchanger (142). The indoor unit fan (145) may be installed in the indoor unit (200). When the indoor unit fan (145) operates, indoor air may pass through the indoor unit (200) and the first heat exchanger (141) and the second heat exchanger (142).

[0090] The above refrigerant pipe (101) may include a low-pressure pipe (101d) extending from the outlet side of the second heat exchanger (142) to the suction side of the compressor (101). The low-pressure pipe (101d) may be connected to a gas-liquid separator (150).

[0091] The refrigerant evaporated in the second heat exchanger (142) flows through the low-pressure pipe (101d) and can be separated into gas and liquid in the gas-liquid separator (150). The gaseous refrigerant separated in the gas-liquid separator (150) can be sucked into the compressor (101) through the low-pressure pipe (101d).

[0092] The refrigerant flow described above can circulate in a cycle during operation of the air conditioner (10).

[0093] FIG. 2 is a front view showing the configuration of a ceiling-type air conditioner according to a first embodiment of the present invention, FIG. 3 is a cross-sectional view taken along 3-3 of FIG. 2, FIG. 4 is a front view showing the arrangement of internal components of a ceiling-type air conditioner according to a first embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along 5-5 of FIG. 4.

[0094] Referring to FIGS. 2 to 5, an indoor unit (200) according to an embodiment of the present invention may include a casing (210) and a front panel (250).

[0095] The above casing (210) is embedded in the interior space of the ceiling, and the front panel (250) can be coupled to the lower side of the casing (210). In addition, the front panel (250) can be positioned at approximately the height of the ceiling and exposed to the outside.

[0096] A number of parts can be installed inside the above casing (210).

[0097] The above-described plurality of components may include a heat exchanger (141, 142) that exchanges heat with air sucked into the interior of the casing (210). The heat exchanger (141, 142) may extend upwardly at an angle with respect to the front panel (250).

[0098] The above heat exchangers (141, 142) may include a first heat exchanger (141) and a second heat exchanger (142). From a refrigerant flow perspective, the second heat exchanger (142) may be placed on the outlet side of the first heat exchanger (141).

[0099] The above indoor unit (200) may include a heat exchanger support (270) that supports the first and second heat exchangers (141, 142). The heat exchanger support (270) may function as a main drain pan that collects condensate generated in the first and second heat exchangers (141, 142).

[0100] The above first heat exchanger (141) can be supported on the heat exchanger support member (270) and arranged to be inclined upward toward the discharge member (255a).

[0101] The above second heat exchanger (142) can be supported on the heat exchanger support member (270) and arranged to be inclined upward toward the suction member (251a, 252a).

[0102] According to this configuration, multiple heat exchangers can be easily installed inside a casing (21) with a limited volume to increase the heat exchange area (improvement of installation efficiency).

[0103] A space (211) for installing an indoor fan (145) may be formed between the first heat exchangers (141, 142). Due to the inclined arrangement of the first and second heat exchangers (141, 142), the space (211) may be formed to increase in size as it goes upward.

[0104] For example, the indoor unit fan (145) may include a cross-flow fan.

[0105] The second heat exchanger (142) may be installed on the suction side of the indoor unit fan (145), and the first heat exchanger (141) may be installed on the discharge side of the indoor unit fan (145).

[0106] Accordingly, at least a portion of the air sucked into the indoor unit (200) can be heat-exchanged in the second heat exchanger (142), then pass through the indoor unit fan (145), and then heat-exchanged in the first heat exchanger (141).

[0107] The above-described plurality of components may further include a sub-drain pan (261, 265) that supports the lower portions of the first and second heat exchangers (141, 142). The sub-drain pan (261, 265) may include a first drain pan (261) provided on the lower surface of the first heat exchanger (141) and a second drain pan (265) provided on the lower surface of the second heat exchanger (142).

[0108] The first drain pan (261) can collect condensate generated from the first heat exchanger (141), and the second drain pan (265) can collect condensate generated from the second heat exchanger (142).

[0109] The condensate collected in the first and second drain pans (261, 265) can be collected in the heat exchanger support (270) provided at a lower position than the first and second drain pans (261, 265).

[0110] The above-described plurality of components may further include a filter (230) arranged on the inside of the suction portion (251a, 252a) of the front panel (250) to filter out foreign substances in the air. The filter (230) may be provided at a position corresponding to the suction portion (251a, 252a) so as to have an area greater than that of the suction portion (251a, 252a) so that air sucked from the suction portion (251a, 252a) can pass therethrough.

[0111] The above-described plurality of components further include a PCB device (240) that controls the operation of the air conditioner (10). The PCB device (240) may be installed on the inner surface of the casing (100). The PCB device (240) may include a controller.

[0112] The front panel (250) is mounted on the front of the casing (210) and may be formed in an approximately rectangular shape when viewed from below. The front panel (250) may be formed to protrude further outward than the lower end of the casing (210) so that the peripheral portion may be configured to contact the lower surface of the ceiling.

[0113] The front panel (250) may form a suction portion (251a, 252a) for sucking air. The suction portion (251a, 252a) may include a first suction portion (251a) and a second suction portion (252a).

[0114] The first suction part (251a) is positioned at the center of the front panel (250) and may be formed to extend in the left and right directions. The first suction part (251a) is a suction part that is always open regardless of the operating mode of the air conditioner, such as cooling mode or dehumidification mode, and may be understood as a "main suction part."

[0115] Define the direction. Based on FIGS. 2 and 3, the front panel (250) is understood to be provided at the front of the casing (210), and the direction in which the first suction portion (251a) extends can be understood to be the left and right direction of the indoor unit.

[0116] A suction grill (251) may be provided in the first suction portion (251a). The suction grill (251) may include a plurality of grill portions to prevent foreign substances from entering through the suction portion (251a).

[0117] The above second suction unit (252a) can be placed on both sides of the front panel (250).

[0118] The second suction portion (252a) may be positioned on both sides of the first suction portion (251a). That is, the first suction portion (251a) may be formed between the second suction portions (252a) on both sides.

[0119] The above second suction unit (252a) is a suction unit that can be selectively opened based on the operation mode of the air conditioner, such as cooling mode or dehumidification mode, and can be understood as a “sub suction unit” or a “bypass suction unit.”

[0120] A suction vane (252) may be provided in the second suction portion (252a). The suction vane (252) may be provided to be movable to open or close the second suction portion (252a). The control unit of the air conditioner (10) may drive the suction vane (252) to open and close the second suction portion (252a).

[0121] The first suction part (251a) and the second suction part (252a) can be separated from each other so that the suctioned air does not mix with each other.

[0122] For example, a partition (253) may be provided between the first suction part (251a) and the second suction part (252a) so that they can be separated from each other. The partition (253) may be configured to extend a predetermined length into the interior of the casing (210) between the first and second suction parts (251a, 252a).

[0123] Accordingly, the air sucked through the first suction part (251a) and the air sucked through the second suction part (252a) are partitioned by the partition part (253) and can flow through separate paths.

[0124] The front panel (250) may form a discharge portion (255a) for discharging air. The discharge portion (255a) may be formed to be long in the horizontal direction at a position adjacent to the upper end of the front panel (250). On the other hand, the first and second suction portions (251a, 252a) may be formed to be long in the horizontal direction at a position adjacent to the lower end of the front panel (250).

[0125] A discharge vane (255) may be provided in the discharge portion (255a). The discharge vane (255) may be provided to be movable to open or close the discharge portion (255a).

[0126] The control unit of the air conditioner (10) can drive the discharge vane (255) to open and close the discharge portion (255a). Depending on the opening degree of the discharge portion (255a) opened and closed by the discharge vane (255), the amount or wind direction of air discharged through the discharge portion (255a) can be adjusted. For example, the discharge vane (252) can be provided to be rotatable around a hinge axis provided at both ends of the discharge vane (252).

[0127] When the indoor unit fan (145) is driven, air in the indoor space is sucked into the casing (210) through the first suction part (251a) or the second suction part (252a) and heat-exchanged in the first heat exchanger (141) or the second heat exchanger (142). At this time, the air passes through the indoor unit fan (145) after being heat-exchanged in the second heat exchanger (142), and the air discharged from the indoor unit fan (145) can be heat-exchanged in the first heat exchanger (141).

[0128] The air that has passed through the first heat exchanger (141) can be discharged through the discharge port (255a) of the front panel (250).

[0129] As described above, the air sucked through the first suction portion (251a) passes through the second heat exchanger (142), the indoor unit fan (145), and the first heat exchanger (141) in sequence, and can be discharged to the outside of the indoor unit (200) through the discharge portion (255a).

[0130] The air sucked through the second suction part (252a) forms a flow that bypasses the second heat exchanger (142), so that it may not exchange heat with the second heat exchanger (142).

[0131] A bypass device (300) connected to the second suction unit (252a) may be provided inside the casing (210). Since the second suction unit (252a) is provided on both sides of the first suction unit (251a), two bypass devices (300) may be provided.

[0132] For example, the two bypass devices (300) may include a first bypass device (301) provided on one side of the first suction part (251a) and a second bypass device (302) provided on the other side of the first suction part (251a).

[0133] The above bypass device (300) may include a bypass passage (340) that forms a flow of air sucked from the second suction portion (252a). The bypass passage (340) may be formed in a duct (310).

[0134] The above duct (310) has an inlet end connected to the second suction portion (252a) and can extend in a direction toward the discharge portion (255a). The inlet end can form a bypass suction portion (320).

[0135] The above duct (310) may be arranged on the side of the second heat exchanger (142). Therefore, the air sucked in from the second suction portion (252a) may flow along the outer side of the second heat exchanger (142) without passing through the heat exchange surface of the second heat exchanger (142).

[0136] The above duct (310) may include a guide surface (312) that guides the flow of air so that the air that bypasses the second heat exchanger (142) can flow in toward the center of the indoor unit (200), that is, toward the center (center in the left-right direction) of the indoor unit fan (145).

[0137] The above guide surface (312) may include a curved surface or a rounded surface so as to smoothly redirect the air flow toward the indoor unit fan (145).

[0138] The above duct (310) may include a bypass discharge portion (330) that discharges air from the bypass path (340). The bypass discharge portion (330) may be understood as a discharge-side end portion of the duct (310) that discharges air into the space portion (211).

[0139] The above bypass discharge unit (330) can discharge air into the space between the first heat exchanger (141) and the second heat exchanger (142).

[0140] The above duct (310) extends from the bypass intake (320) toward the bypass discharge (330), and its cross-sectional area may be formed to decrease based on the air flow direction.

[0141] That is, the cross-sectional area of ​​the bypass discharge portion (330) may be smaller than the cross-sectional area of ​​the bypass suction portion (320). With this configuration, the flow velocity of air from the bypass suction portion (320) toward the bypass discharge portion (330) may increase, thereby improving flow efficiency.

[0142] Since the first and second bypass devices (300) are provided on both sides of the second heat exchanger (142), the air that has passed through the first bypass device and the air that has passed through the second bypass device can flow in a direction that brings them closer to each other. That is, the air that has passed through the first bypass device can flow to the right toward the center of the indoor fan (145), and the air that has passed through the second bypass device can flow to the left toward the center of the indoor fan (145).

[0143] Air passing through the above duct (310) is discharged into the space (211) and can be sucked into the indoor unit fan (145).

[0144] FIG. 6a is a cycle diagram showing the refrigerant flow during cooling mode operation of a ceiling-type air conditioner according to a first embodiment of the present invention, FIG. 6b is a front view showing the air flow during cooling mode operation of a ceiling-type air conditioner according to a first embodiment of the present invention, FIG. 7a is a cycle diagram showing the refrigerant flow during dehumidification mode operation of a ceiling-type air conditioner according to a first embodiment of the present invention, and FIG. 7b is a front view showing the air flow during dehumidification mode operation of a ceiling-type air conditioner according to a first embodiment of the present invention.

[0145] First, referring to FIG. 6a, when the cooling mode operation of the air conditioner (10) according to the first embodiment of the present invention starts, the compressor (110) is driven so that the refrigeration cycle can be circulated.

[0146] The refrigerant compressed in the compressor (110) can be condensed in the condenser (120) and pass through the first heat exchanger (141) and the second heat exchanger (142). The indoor unit fan (145) can be driven.

[0147] The first expansion device (131) provided on the inlet side of the first heat exchanger (141) is opened and controlled (state B), and the refrigerant can be decompressed in the first expansion device (131). The decompressed refrigerant can evaporate (primary evaporation) while passing through the first heat exchanger (141). The first heat exchanger (141) can function as an evaporator.

[0148] The refrigerant that has passed through the first heat exchanger (141) can pass through the second expansion device (135). At this time, the second expansion device (135) is fully open (state A), and the refrigerant may not be depressurized during the process of passing through the second expansion device (135).

[0149] The refrigerant that has passed through the second expansion device (135) can evaporate (secondary evaporation) while passing through the second heat exchanger (142). The first heat exchanger (141) can function as an evaporator.

[0150] The refrigerant evaporated in the second heat exchanger (142) can be sucked into the compressor (110) through the gas-liquid separator (150). Such a refrigerant cycle can be formed.

[0151] Referring to FIG. 6b in terms of air flow, the control unit of the air conditioner (10) can control the suction vane (252) to close the second suction portion (252a).

[0152] When the indoor fan (145) operates, air in the indoor space can be sucked into the interior of the casing (210) through the first suction part (251a). By closing the suction vane (252), air sucked through the second suction part (252a) can be restricted.

[0153] The air sucked in from the first suction portion (251a) can be cooled by first passing through the second heat exchanger (145). The air that has passed through the second heat exchanger (145) is sucked in by the indoor unit fan (145) and discharged, and can be cooled by passing through the first heat exchanger (141).

[0154] In this way, the cooling effect can be improved because the air can be cooled while passing through multiple heat exchangers (141, 142).

[0155] Air passing through the first heat exchanger (141) can be discharged into the indoor space through the discharge portion (255a). The control portion can open the discharge portion (255a) by controlling the discharge vane (255).

[0156] Referring to FIG. 7a, when the dehumidification mode operation of the air conditioner (10) according to the first embodiment of the present invention starts, the compressor (110) is driven so that the refrigeration cycle can be circulated.

[0157] The refrigerant compressed in the compressor (110) can be condensed in the condenser (120) and pass through the first heat exchanger (141) and the second heat exchanger (142). The indoor unit fan (145) can be driven.

[0158] The first expansion device (131) provided on the inlet side of the first heat exchanger (141) is fully open (state A), and the refrigerant can pass through the first expansion device (131) without pressure reduction. The refrigerant passing through the first expansion device (131) can be further condensed while passing through the first heat exchanger (141). The first heat exchanger (141) can function as a condenser.

[0159] The refrigerant that has passed through the first heat exchanger (141) can pass through the second expansion device (135). At this time, the opening of the second expansion device (135) is controlled (state B), and the refrigerant can be depressurized while passing through the second expansion device (135).

[0160] The refrigerant depressurized in the second expansion device (135) can evaporate while passing through the second heat exchanger (142). The second heat exchanger (141) can function as an evaporator.

[0161] The refrigerant evaporated in the second heat exchanger (142) can be sucked into the compressor (110) through the gas-liquid separator (150). Such a refrigerant cycle can be formed.

[0162] Referring to FIG. 7b in terms of air flow, the control unit of the air conditioner (10) can control the suction vane (252) to adjust the suction vane (252) to open the second suction portion (252a).

[0163] When the indoor fan (145) operates, air in the indoor space can be sucked into the casing (210) through the first suction part (251a) and the second suction part (252a). That is, at least some of the air can be sucked through the first suction part (251a), and the other part of the air can be sucked through the second suction part (252a).

[0164] The air sucked in from the first suction portion (251a) is cooled while first passing through the second heat exchanger (145) and can flow into the space portion (211). As the air is cooled in the second heat exchanger (145), moisture is condensed, and the condensed water can be collected in the second drain pan (265) of the second heat exchanger (145). Therefore, dehumidification of the air can be achieved.

[0165] The air sucked in from the second suction part (252a) can be introduced into the duct (310) through the bypass suction part (320). The air in the duct (310) flows along the side of the second heat exchanger (145), and can bypass the second heat exchanger (145) and not exchange heat with the second heat exchanger (145).

[0166] The air within the duct (310) can be introduced into the space (211) between the second heat exchanger (142) and the first heat exchanger (141) along the guide surface (312). At this time, the air can be discharged from the duct (310) through the bypass discharge portion (330).

[0167] Air sucked in from the first suction part (251a) and heat-exchanged with the second heat exchanger (145) and air sucked in from the second suction part (252a) and bypassing the second heat exchanger (145) can be mixed in the space (211).

[0168] The temperature of the mixed air may have a value between the temperature of the air cooled in the second heat exchanger (145) and the temperature of the indoor air. That is, the temperature value of the air cooled in the second heat exchanger (145) may increase.

[0169] The above mixed air can be sucked in by the indoor fan (145) placed in the space (211) and introduced into the first heat exchanger (141). The above mixed air can be heated in the first heat exchanger (141) to increase its temperature (reheating of air).

[0170] The above heated air can be discharged into the indoor space through the discharge portion (255a).

[0171] In this way, the air sucked in from the second suction portion (252a) bypasses the second heat exchanger (142) and is mixed with the air cooled in the second heat exchanger (142), so that the temperature of the air that has passed through the second heat exchanger (142) can initially increase.

[0172] In addition, the air is heated in the first heat exchanger (141) through the indoor unit fan (145), thereby increasing its temperature secondarily, and can be discharged through the discharge portion (255a). Therefore, when the dehumidification mode is performed, the air is not cooled but only dehumidified and can be supplied to the indoor space, so that the user does not feel cold (constant temperature dehumidification effect).

[0173] Meanwhile, the first heat exchanger (141) and the second heat exchanger (142) are spaced apart from each other, and the indoor unit fan (145) is placed in the spaced apart space, so that the distance between the second heat exchanger (142) acting as an evaporator and the first heat exchanger (141) acting as a condenser can be increased.

[0174] Accordingly, it is possible to prevent heat transfer between the first and second heat exchangers (141, 142) and a decrease in heat exchange efficiency. In addition, it is possible to prevent the problem of water condensed in the second heat exchanger (142) coming into contact with the first heat exchanger (141) and humidifying the air directed toward the second heat exchanger (142).

[0175] Another embodiment is proposed. Although the duct (310) is described as being provided as a component forming the bypass flow path (340), alternatively, a "flow plate" may be provided to form the flow path rather than a complete duct.

[0176] Hereinafter, a second embodiment of the present invention will be described. Since the second embodiment differs from the first embodiment in some configurations, the description will focus on the differences, and for parts that are identical to those of the first embodiment, the description and drawing references of the first embodiment will be used.

[0177] FIG. 8 is a cross-sectional view showing the configuration of a ceiling-type air conditioner according to a second embodiment of the present invention and the air flow during cooling mode operation, and FIG. 9 is a cross-sectional view showing the configuration of a ceiling-type air conditioner according to a second embodiment of the present invention and the air flow during dehumidification mode operation.

[0178] Referring to Fig. 8, the indoor unit (200a) of the air conditioner (10) according to the second embodiment of the present invention may include a first suction unit (1251a) and a second suction unit (1252a) for sucking indoor air. The first and second suction units (1251a, 1252a) may be provided on the front panel (250) of the indoor unit.

[0179] The above first suction portion (1251a) can be formed on a suction grill (1251).

[0180] A suction vane (1252) may be provided in the second suction portion (1252a). The suction vane (1252) may be provided to be movable to open or close the second suction portion (1252a).

[0181] The front panel (250) may include a discharge portion (255a) for discharging air from the indoor unit (200a). A discharge vane (255) is provided in the discharge portion (255a), and the discharge vane (255) may be provided to be movable for opening and closing the discharge portion (255a).

[0182] The first suction part (1251a) may be formed between the second suction part (1252a) and the discharge part (255a). That is, the second suction part (1252a), the first suction part (1251a), and the discharge part (255a) may be formed in the vertical direction of the indoor unit (200a) with reference to FIG. 2.

[0183] The casing (210) of the above indoor unit (200a) may include a bypass device (300a).

[0184] The above bypass device (300a) may include a duct (310a) that is connected to the second suction unit (1252a) and forms a flow path (340a, bypass flow path) for bypassing the second heat exchanger (142).

[0185] The above bypass path (340a) can be formed along the outer side of the second heat exchanger (142) to bypass the second heat exchanger (142).

[0186] The above duct (310a) may be configured as a complete duct or may be configured as a plate for forming a flow path.

[0187] The above duct (310a) may include a bypass suction portion (320a) connected to the second suction portion (1252a). The bypass suction portion (320a) may form one end of the duct (310a).

[0188] The above duct (310a) may include a bypass discharge portion (330a) for introducing air sucked from the second suction portion (1252a) into the space portion (211). The bypass discharge portion (330a) may form the other end of the duct (310a).

[0189] The above duct (310a) may include a guide surface (312a) that guides the flow of air so that the air bypassing the second heat exchanger (142) can flow toward the vertical reference center of the indoor unit (200).

[0190] The above guide surface (312a) may include a curved surface or a rounded surface so as to smoothly redirect the air flow toward the indoor unit fan (145).

[0191] The above indoor unit fan (145) may be installed in a space (211) forming a space between the first and second heat exchangers (141, 142). The second heat exchanger (142) may be installed on the suction side of the indoor unit fan (145), and the first heat exchanger (141) may be installed on the discharge side of the indoor unit fan (145).

[0192] Referring to Fig. 8, when the air conditioner (10) is operated in cooling mode, the suction vane (1252) may be closed, thereby restricting the intake of air through the second suction unit (1252a).

[0193] Accordingly, when the indoor unit fan (145) is operated, indoor air can be sucked in through the first suction portion (1251a), evaporated first in the second heat exchanger (142), and then evaporated secondarily in the first heat exchanger (141) after passing through the indoor unit fan (145). Then, the air can be discharged into the indoor air through the discharge portion (255a). In this regard, the description of the first embodiment is cited.

[0194] Referring to Fig. 9, when the air conditioner (10) is operated in dehumidification mode, the suction vane (1252) is opened so that air can be sucked in through the second suction part (1252a).

[0195] Therefore, when the indoor unit fan (145) is operated, indoor air can be sucked into the indoor unit (200a) through the first suction part (1251a) and the second suction part (1252a).

[0196] The air sucked in from the first suction part (1251a) can be evaporated in the second heat exchanger (142) and sucked into the indoor unit fan (145). During the evaporation process, dehumidification of the air can be achieved.

[0197] Meanwhile, air sucked in from the second suction unit (1252a) and flowing through the duct (310a) is mixed with air evaporated in the second heat exchanger (142), and the mixed air can be sucked into the indoor unit fan (145). In this process, the temperature evaporated in the second heat exchanger (142) can rise by a predetermined temperature.

[0198] Air passing through the above indoor unit fan (145) is heated in the first heat exchanger (141), and the heated air can be discharged into the indoor space through the discharge portion (255a). Accordingly, relatively warm air is discharged into the indoor space, thereby providing satisfaction to users who do not want air conditioning.

[0199] According to an embodiment of the present invention, the arrangement structure of internal components provided in an indoor unit is improved, so that the temperature of the air discharged during dehumidification mode operation can be maintained constant, and thus the industrial applicability is remarkable.

Claims

1. A casing that is built into the ceiling and has an indoor fan; A first heat exchanger and a second heat exchanger provided inside the above casing; A front panel provided on one side of the casing and forming an intake for drawing air into at least one of the first heat exchanger and the second heat exchanger; and A bypass device is included to form a bypass path to limit air from flowing into the second heat exchanger among the first and second heat exchangers. The above suction part, A first suction unit that sends air to the second heat exchanger; and A ceiling-type air conditioner, which is connected to the above-mentioned bypass device and includes a second suction unit for sucking air that bypasses the second heat exchanger.

2. In paragraph 1, A ceiling-type air conditioner comprising a space portion forming a spaced space between the first heat exchanger and the second heat exchanger, and the indoor unit fan is installed in the space portion.

3. In paragraph 1, A ceiling-type air conditioner in which the second heat exchanger is installed on the suction side of the indoor unit fan, and the first heat exchanger is installed on the discharge side of the indoor unit fan.

4. In paragraph 1, The above front panel further includes an exhaust portion that discharges air passing through the indoor unit fan into the indoor space, A ceiling-type air conditioner in which the second heat exchanger is arranged inside the first suction portion, and the discharge portion is arranged on the discharge side of the first heat exchanger.

5. In paragraph 1, The above casing further includes a heat exchanger support member that supports the first heat exchanger or the second heat exchanger, The above first heat exchanger and the above second heat exchanger, A ceiling-type air conditioner in which the first heat exchanger and the second heat exchanger are arranged at an angle with respect to the heat exchanger support member so that an installation space for the indoor unit fan is formed between the first heat exchanger and the second heat exchanger.

6. In paragraph 1, A first expansion device provided on the inlet side of the first heat exchanger and capable of controlling the opening to reduce the pressure of the refrigerant; and A ceiling-type air conditioner further comprising a second expansion device provided on the inlet side of the second heat exchanger and capable of controlling opening to depressurize the refrigerant.

7. In paragraph 6, The above first expansion device and the above second expansion device are composed of an electronic expansion valve (EEV), In the cooling mode, the control unit adjusts the opening of the first expansion device so that the refrigerant is decompressed in the first expansion device, and completely opens the second expansion device so that the refrigerant is not decompressed in the second expansion device. A ceiling-type air conditioner in which, in the dehumidifying mode, the control unit completely opens the first expansion device so that the refrigerant is not decompressed in the first expansion device, and adjusts the opening of the second expansion device so that the refrigerant is decompressed in the second expansion device.

8. In paragraph 1, Further comprising a refrigerant pipe connecting the first heat exchanger and the second heat exchanger, A ceiling-type air conditioner in which the second heat exchanger is connected in series to the first heat exchanger through the refrigerant pipe.

9. In paragraph 1, It further includes a suction vane for opening or closing the second suction unit and a control unit for controlling the suction vane and the indoor unit fan. The above control unit, A ceiling-type air conditioner that controls the suction vane to close the second suction part when operating in cooling mode, and controls the suction vane to open the second suction part when operating in dehumidifying mode.

10. In paragraph 1, The above bypass device, Including a duct forming the above bypass path, A ceiling-type air conditioner in which the above duct extends along the outer side of the second heat exchanger from the second suction portion to the space between the first and second heat exchangers.

11. In paragraph 10, The above duct, A bypass suction portion forming one end of the above duct and connecting to the second suction portion; and A ceiling-type air conditioner comprising a bypass discharge portion forming the other end of the duct and discharging air into a space between the first heat exchanger and the second heat exchanger.

12. In paragraph 11, A ceiling-type air conditioner in which the cross-sectional area of ​​the bypass discharge portion is formed smaller than the cross-sectional area of ​​the bypass suction portion.

13. In paragraph 1, The above bypass device includes a first bypass device and a second bypass device provided on both sides of the first suction part, A ceiling-type air conditioner further comprising a space in which air passing through the first bypass device and the second bypass device is combined, and in which the indoor unit fan is installed in the space.

14. In paragraph 1, The above front panel further includes an exhaust portion that discharges air passing through the indoor unit fan into the indoor space, A ceiling-type air conditioner in which the second suction part, the first suction part, and the discharge part are arranged sequentially toward one direction of the front panel.

15. A casing that is built into the ceiling and has an indoor fan; A first heat exchanger provided inside the above casing and provided on the discharge side of the indoor unit fan; A second heat exchanger provided inside the above casing and provided on the suction side of the indoor unit fan; A front panel covering the inside of the casing, comprising a first suction part for sucking air toward the second heat exchanger and a second suction part for sucking air bypassing the second heat exchanger; and A duct connected to the second suction portion and extending along the side of the second heat exchanger to bypass the second heat exchanger, A ceiling-type air conditioner, wherein the duct includes a bypass discharge portion that discharges air into a space between the first heat exchanger and the second heat exchanger.

16. In paragraph 15, The above indoor unit fan is a ceiling-type air conditioner installed in the above space.

17. In paragraph 16, Further comprising a heat exchanger support member placed at the bottom of the first heat exchanger or the second heat exchanger, The above first heat exchanger and the above second heat exchanger, A ceiling-type air conditioner in which the heat exchanger support member is inclined upward so that an installation space for the indoor unit fan is formed between the first heat exchanger and the second heat exchanger.

18. In paragraph 15, The above first heat exchanger and the above second heat exchanger, A ceiling-type air conditioner in which the refrigerant passing through the second heat exchanger is connected in series through a refrigerant pipe so that the refrigerant flows into the first heat exchanger.

19. In Article 15, Further comprising a suction vane for opening or closing the second suction portion, The control unit is, A ceiling-type air conditioner that controls the suction vane to close the second suction part when operating in cooling mode, and controls the suction vane to open the second suction part when operating in dehumidifying mode.

20. In paragraph 15, The above duct, a bypass suction unit connected to the second suction unit; and A ceiling-type air conditioner including a guide surface that extends from the bypass suction portion to the bypass discharge portion and is bent or rounded to guide air into the space between the first and second heat exchangers.

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