Indoor unit of air-conditioner

An indoor unit-of an air-conditioner, comprising:

• a unit body constructed and arranged so that it can be recessed in a ceiling, having a lower surface portion exposed inside a room, comprising:
• at least one indoor heat exchanger arranged in said unit body;
• a blower fixed to said unit body;
• and
• a filter;
• wherein the lower surface portion is a decorative panel having a frame portion, and having an inlet port for guiding air in a room to said indoor heat exchanger, and having a filter fixing portion, structured as a part of said decorative panel, said filter being detachably attached to the filter fixing portion;
• a support portion provided on one side end of the filter fixing portion for supporting the filter fixing portion to be freely rotatable with respect to the frame of said decorative panel;
• and
• an open/close driving mechanism positioned in a spatial portion of a central panel portion of said decorative panel for driving the filter fixing portion to be freely opened and closed against the frame of said decorative panel in a state that said support portion is used as a fulcrum, comprising:
• an actuation cord having one end connected to a free end of the filter fixing portion, having another end fixed to a fixing portion, and having a middle portion;
• a belt member having a pulley for an engagement with the actuation cord on its middle portion;
• a pair of pulleys for engaging with said belt member to be endlessly and freely run;
• and
• a drive source, coupled to a support shaft of one of said pair of pulleys, for reciprocating said belt member and the pulley for the engagement with the actuation cord through the pulley and to move the actuation cord through the pulley and to move the actuation cord back and forth, thereby opening/closing the filter fixing portion of said decorative panel to the unit body.

An indoor unit of an air-conditioner, comprising:

• a unit body constructed and arranged so that it can be recessed in a ceiling, having a lower surface portion exposed inside a room, comprising:
• at least one indoor heat exchanger arranged in said unit body;
• a blower fixed to said unit body;
• and
• a filter;
• wherein the lower surface portion is a decorative panel having a frame portion, and having an inlet port for guiding air in a room to said indoor heat exchanger, and having a filter fixing portion, structured as a part of said decorative panel, said filter being detachably attached to the filter fixing portion;
• a support portion provided on one side end of the filter fixing portion for supporting the filter fixing portion to be freely rotatable with respect to the frame of said decorative panel;
• and
• an open/close driving mechanism positioned in a spatial portion of a central panel portion of said decorative panel for driving the filter fixing portion to be freely opened and closed against the frame of said decorative panel in a state that said support portion is used as a fulcrum, comprising:
• a belt member having a pulley;
• an idle pulley provided at a position close to said belt member;
• an actuation cord bent to form an intermediate portion having one end connected to one free end of the filter fixing portion and a second end connected to a second free end of the filter fixing portion, and having a middle portion, wherein said pulley of said belt member engages with said actuation cord on the middle portion for the engagement of the actuation cord to be doubled, and wherein the bent portion of said actuation cord engages with said idle pulley;
• a pair of pulleys for engaging with said belt member to be endlessly and freely run;
• and
• a drive source, coupled to a support shaft of one of said pair of pulleys, for reciprocating said belt member and the pulley for the engagement with the actuation cord through the pulley and to move the actuation cord back and forth, thereby opening/closing the filter fixing portion of said decorative panel to the unit body.

An indoor unit of an air-conditioner comprising:

• a unit body, constructed and arranged so that it can be recessed in a ceiling, having a lower surface portion exposed inside a room, comprising:
• at least one indoor heat exchanger arranged in said unit body;
• a blower fixed to said unit body;
• and
• a filter;
• wherein an inlet port is provided on the lower surface portion of said unit body for guiding air in a room to said at least one indoor heat exchanger, and a filter fixing portion is provided at a position opposite to said inlet port, said filter being detachably attached to the filter fixing portion;
• a drive mechanism for lifting the filter fixing portion up and down, wherein said drive mechanism comprises a plurality of actuation cords, and is placed at a position close to a hanging portion of each said plurality of actuation cords;
• an engaging portion for engaging the filter fixing portion to said unit body and to detach from containing the filter fixing portion to said unit body by said drive mechanism, wherein said engaging portion engages with the filter fixing portion by applying a pressing force, and disengages with the filter fixing portion by applying a pressing force again, and wherein a number of said engaging portions is provided to be the same as a number of said plurality of actuation cords;
• and
• a detection switch, provided at a position adjacent to said engaging portions, for detecting when said engaging portions are set in a containing state to engage with the filter fixing portion.

An indoor unit of an air-conditioner comprising:

• a unit body, provided on a rear of a ceiling, having an lower surface portion exposed indoor and an indoor heat exchanger and a blower in its exterior;
• a decorative panel, structured as the lower surface portion for said unit body, having an inlet port for guiding air in a room to said indoor heat exchanger;
• a filter fixing portion, structured as a part of said decorative panel, having a filter attached to a position opposite to said inlet port to be detachable;
• actuation cords for hanging said filter fixing portion, and lifting up and down said filter fixing portion to open/close said decorative panel;
• engaging portions for detachably engaging with said filter fixing portion by adding pressing force when said filter fixing portion closes said decorative panel, and disengages with said filter fixing portion by adding pressing force again;
• a motor positively rotating to pull up the actuation cords, thereby lifting up said filter fixing portion, and for reversely rotating to pull down the actuation cords thereby lifting down said filter fixing portion;
• a detection switch, provided at a position adjacent to said engaging portions, for detecting that said engaging portions are set in a state to engage with said filter fixing portion;
• and
• controlling means for controlling said motor to be once positively rotated from a state that said engaging portions engage with said filter fixing portion to pull up the actuation cords in accordance with an operation of a filter lifting switch, thereafter controlling said motor to be reversely rotated to pull down the filter fixing portion to be stopped, and said controlling means for controlling said motor to be, positively rotated to pull up said filter fixing portion from the time when said filter fixing portion opens said decorative panel until said detection switch detects that said engaging portions are set in a state to engage with said filter fixing portion in accordance with the operation of the filter lifting switch, after detecting, said controlling means for further pulling up said filter fixing portion, and thereafter reversely rotating said motor to loosen said actuation cords to pull down the filter fixing portion to be stopped.