Cross flow fan and indoor unit of air-conditioning apparatus

A cross flow fan comprising:

• an impeller that includes a plurality of impeller elements each including a plurality of blades disposed along an outer circumference of a support plate, the plurality of impeller elements being fixed to each other in a direction of a rotational axis passing through a center of the support plate;
• wherein each of the blades is divided into a plurality of blade sections in the rotational axis direction;
• wherein at least one of the divided blade sections is a long-chord blade section whose chord has a length greater than a length of a chord of at least another one of the blade sections, the chord being a line segment connecting a blade outer-circumferential edge and a blade inner-circumferential edge of each of the blades in a cross section perpendicular to the rotational axis of the blades;
• wherein the blade inner-circumferential edge of the long-chord blade section protrudes toward an inner circumferential side, relative to the blade inner-circumferential edge of the at least another one of the blade sections as a short-chord blade section having a shorter chord;
• and
• wherein a plurality of recesses are provided at the blade inner-circumferential edge of at least one of the blade sections.

A cross flow fan comprising:

• an impeller that includes a plurality of impeller elements each including a plurality of blades disposed along an outer circumference of a support plate, the plurality of impeller elements being fixed to each other in a direction of a rotational axis passing through a center of the support plate;
• wherein each of the blades is divided into a plurality of blade sections in the rotational axis direction;
• wherein at least one of the divided blade sections is a long-chord blade section whose chord has a length greater than a length of a chord of at least another one of the blade sections, the chord being a line segment connecting a blade outer-circumferential edge and a blade inner-circumferential edge of each of the blades in a cross section perpendicular to the rotational axis of the blades;
• wherein the blade inner-circumferential edge of the long-chord blade section protrudes toward an inner circumferential side, relative to the blade inner-circumferential edge of the at least another one of the blade sections as a short-chord blade section having a shorter chord;
• and
• wherein, at the blade inner-circumferential edge, an inter-blade-section smoothening section is provided at a stepped portion between two adjacent blade sections having chords of different lengths, the inter-blade-section smoothening section having a chord of a length between lengths of the respective chords of the two blade sections.

A cross flow fan comprising:

• an impeller that includes a plurality of impeller elements each including a plurality of blades disposed along an outer circumference of a support plate, the plurality of impeller elements being fixed to each other in a direction of a rotational axis passing through a center of the support plate;
• wherein each of the blades is divided into a plurality of blade sections in the rotational axis direction;
• wherein at least one of the divided blade sections is a long-chord blade section whose chord has a length greater than a length of a chord of at least another one of the blade sections, the chord being a line segment connecting a blade outer-circumferential edge and a blade inner-circumferential edge of each of the blades in a cross section perpendicular to the rotational axis of the blades;
• wherein the blade inner-circumferential edge of the long-chord blade section protrudes toward an inner circumferential side, relative to the blade inner-circumferential edge of the at least another one of the blade sections as a short-chord blade section having a shorter chord;
• and
• wherein, in a cross section perpendicular to the rotational axis of the blades, the blade outer-circumferential edges of all the blades of the impeller element are located on an outer diameter line of a same diameter having a center at a position of the rotational axis;
• a center line between a blade pressure surface as a front surface and a blade pressure suction surface as a rear surface in a rotational direction of the blade is defined as a camber line;
• and, when an angle formed by the outer diameter line and the camber line is defined as an outlet angle, the long-chord blade section has the outlet angle greater than that of the short-chord blade sections.

An air-conditioning apparatus comprising:

• an air inlet that suctions indoor air;
• an air outlet that blows the indoor air suctioned through the air inlet into a room;
• and
• a cross flow fan that blows the indoor air from the air inlet to the air outlet;
• wherein the cross flow fan includes an impeller that includes a plurality of impeller elements each including a plurality of blades disposed along an outer circumference of a support plate, the plurality of impeller elements being fixed to each other in a direction of a rotational axis passing through a center of the support plate;
• and
• wherein each of the blades has a first section through which an airflow flows out from an inner part of the air outlet, the first section being included at a position in the direction of the rotational axis, and has a second section through which an airflow flows out from an outer part, which is greater than the inner part in distance from the rotational axis, of the air outlet, the second section being included at other position in the direction of the rotational axis.