JP6445312B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner using a cross flow fan for blowing air during an air conditioning operation.

  In an indoor unit of an air conditioner, hot air or cold air is blown out from a blower outlet of a cabinet by driving a cross flow fan. In the cross flow fan, the pressure of gas is generally increased by rotating a blade. Although pressure loss occurs when the sucked air passes through the inside of the cabinet, a desired air volume is ensured by increasing the pressure of the air circulating by the cross flow fan.

  By the way, a support shaft projects from the side surface of the cross flow fan in the axial direction, and the support shaft is rotatably supported by the cabinet. A boss is provided on the other side surface of the cross flow fan, the motor shaft of the motor is fitted into the shaft hole of the boss, and the motor shaft is fixed to the boss. There are shafts on both the left and right sides of the cross flow fan, and the space with the shaft is a portion without blades. A pressure difference is generated between the part where the blade is present and the part where the blade is not present, and air that is not subjected to heat exchange near both ends of the cross flow fan is sucked. When this air touches the cold air that has passed through the heat exchanger, dew is produced.

  In order to prevent such condensation, Patent Document 1 provides a rectifying member that covers the end face of the crossflow fan. The rectifying member is formed so as to overlap the end surface of the cross flow fan from the air passage side wall. Thereby, the air which flowed in from the shaft hole of the air passage side wall does not flow to the upstream side of the cross flow fan but is rectified and flows toward the blower outlet side.

Japanese Patent No. 4006703

  However, although air flows in from the side wall along the axial direction between the side surface and the side wall of the cross flow fan, the heat-exchanged air does not flow. At the side end of the cross flow fan, the flow rate in the air blowing direction is reduced, and the air flow along the axial direction is adversely affected, resulting in air loss.

  In view of the above, an object of the present invention is to provide an air conditioner that can reduce the air flow loss of the cross flow fan by increasing the flow rate at the side end of the cross flow fan.

  An air conditioner according to the present invention is provided with a cross flow fan for blowing air that has passed through a heat exchanger and a heat exchanger to a blower outlet in a cabinet in which a suction port and a blower outlet are formed. A cover member that surrounds the side of the cross flow fan is provided so that air does not flow through the side of the flow fan, and an air intake portion that takes in heat-exchanged air is formed in the cover member.

  Air does not flow on the side of the cross flow fan due to the cover member, and the flow rate of air blown at the side end of the cross flow fan is reduced. However, since the air intake is provided in the cover member, the heat-exchanged air flows toward the side end of the cross flow fan. For this reason, the flow rate of the air blow at the side end increases.

  The intake portion is located on the upstream side in the blowing direction of the cross flow fan. The air flowing in from the intake part flows along the blowing direction. Even if the air flowing along the axial direction enters from the outside, the air blown by the cross flow fan is not affected by the air flow.

  The intake section is disposed so as to face the blades of the cross flow fan. The heat-exchanged air flows smoothly from the inlet to the blades at the side edges of the cross flow fan.

  The cover member has a ring portion that surrounds the outer peripheral surface of the side end of the cross flow fan, and a plurality of intake portions are formed in the ring portion. Since only the side edge of the cross flow fan is covered by the ring portion having the air intake portion, the main flow in the blowing direction by the cross flow fan is not obstructed, and the flow in the same direction as the main flow flows on the side of the cross flow fan. Arise.

  According to the present invention, since the heat-exchanged air can flow from the intake portion to the side end of the cross flow fan, the flow rate of the air blown at the side end can be increased. Therefore, the airflow loss of the crossflow fan can be reduced, and the airflow efficiency at the side end of the crossflow fan can be increased.

The perspective view of the indoor unit of the air conditioner of this invention Cross section of indoor unit Sectional view of cabinet with crossflow fan installed and enlarged sectional view of side edge of crossflow fan The perspective view of the cover member of 1st Embodiment Plan view of cover member covering side edge of cross flow fan The perspective view of the cover member of 2nd Embodiment The perspective view of the cover member of 3rd Embodiment The figure which shows the cover member of another form

  The indoor unit of the air conditioner of 1st Embodiment is shown in FIGS. The indoor unit includes a heat exchanger 1 and a cross flow fan 2, which are housed in a cabinet 3. A suction port 4 is formed on the upper surface of the cabinet 3, and an air outlet 5 is formed on the lower portion of the front surface of the cabinet 3.

  An air passage 6 extending from the inlet 4 to the outlet 5 is formed inside the cabinet 3, the heat exchanger 1 is disposed in the air passage 6, and the cross flow fan 2 is disposed downstream of the heat exchanger 1 in the blowing direction. Is placed. A filter 7 is disposed between the suction port 4 and the heat exchanger 1, and dust is removed from the indoor air sucked from the suction port 4 by the filter 7. An air guide panel 8 is provided at the air outlet 5 so as to be openable and closable.

  The cabinet 3 includes a back plate 10 and a front panel 11, and the front panel 11 is detachably attached to the back plate 10. The front panel 11 is formed in a box shape with the back side open, and an opening serving as the air outlet 5 is formed in the lower part of the front surface of the front panel 11.

  The heat exchanger 1 and the cross flow fan 2 are attached to the back plate 10. A guide wall 12 is formed in a curved surface on the front side of the back plate 10. A drain pan unit 13 that receives drain water dripped from the heat exchanger 1 is mounted on the back plate 10. The drain pan unit 13 is disposed below the heat exchanger 1 and ahead of the cross flow fan 2. The drain pan unit 13 is formed in a cylindrical shape, and the air passage 6 is formed by the hollow portion of the drain pan unit 13 and the guide wall 12 of the back plate 10. The cross flow fan 2 is located between the drain pan unit 13 and the guide wall 12 of the back plate 10.

  The cross flow fan 2 is formed by connecting a plurality of impellers arranged in the axial direction. A boss is attached to an end plate on one side of the cross flow fan 2 in the axial direction. A support shaft 15 protrudes from the end plate on the other side of the cross flow fan 2. A side wall 16 of the air passage 6 is formed on the back plate 10 in a pair of left and right. The left and right side walls 16 are respectively provided with flanges 17 for rotatably supporting the cross flow fan 2. A bearing 18 is provided on the flange 17 on the other side, and the support shaft 15 is rotatably supported. A motor 20 accommodated in a motor case 19 is disposed outside the flange 17 on one side. A motor shaft 21 protrudes from the motor case 19. The motor shaft 21 passes through the flange 17 on one side, and is fitted into the boss of the cross flow fan 2, so that the motor shaft 21 is fixed to the boss.

  There is a gap between the left and right side surfaces of the cross flow fan 2 and the flange 17. A cover member 30 that surrounds the side of the cross flow fan 2 is provided so that air does not flow through the gap on the side of the cross flow fan 2. The cover members 30 are respectively disposed on the left and right side ends of the cross flow fan 2.

  The cover member 30 has a ring portion 31 that covers the outer peripheral surface of the cross flow fan 2. The ring portion 31 is provided on the side wall 16 so as to protrude toward the inner side in the axial direction. The ring portion 31 is formed in an arc shape having a larger diameter than the outer diameter of the cross flow fan 2. The drain pan unit 13 is provided with a stabilizer 32 constituting the upper wall of the air passage 6, and the front end of the ring portion 31 is in contact with or close to the stabilizer 32. The rear end of the ring portion 31 is in contact with or close to the guide wall 12 of the back plate 10. The inner side edge of the ring portion 31 is located closer to the center than the end plate of the cross flow fan 2. The axial width of the ring portion 31 is set to be equal to or less than the distance between the side surface of the cross flow fan 2 and the flange 17, and the cross flow fan 2 can be displaced in the axial direction so that the cross flow fan 2 can be attached to and detached from the cabinet 3.

  Thus, the cover member 30 surrounding the side end of the cross flow fan 2 is formed by using a plurality of members that form the air passage 6 such as the side wall 16, the drain pan unit 13, and the guide wall 12. Since the cover member 30 surrounds the side end of the cross flow fan 2, the space between the end plates 34 and the side walls 16 at both ends of the cross flow fan 2 that leads to the outside of the air passage 6 is shielded. Thereby, in the space on the side of the cross flow fan 2, it is possible to prevent an air flow different from the main flow of the cross flow fan 2, that is, a flow in a direction different from the blowing direction. Therefore, the disturbance of the air flow on the side of the cross flow fan 2 does not occur.

  As shown in FIGS. 4 and 5, the cover member 30 is provided with an intake portion 33 that faces the air passage 6. A circular hole is formed in the ring portion 31 as the intake portion 33. The air intake portion 33 is located upstream of the cross flow fan 2 in the air blowing direction, and a plurality of air intake portions 33 are arranged at equal intervals. The intake portion 33 faces the heat exchanger 1, and the intake portion 33 is located closer to the inner side than the end plate 34 of the cross flow fan 2 and hangs on the blade. Thereby, the side end of the cross flow fan 2 covered by the cover member 30 communicates with the air passage 6.

  When the cross flow fan 2 is driven, the air that has passed through the heat exchanger 1 and exchanged heat passes through the air passage 6 and is blown out into the room from the outlet 5. On both the left and right sides of the cross flow fan 2, the space surrounded by the cover member 30 has a negative pressure, and heat-exchanged air is taken in from the intake portion 33. The air taken into this space flows into the blade at the side end of the cross flow fan 2 and is blown out toward the outlet 5. A part of the air that flows in flows through the space between the side surface of the cross flow fan 2 and the flange 17 and the side wall 16 and is drawn into the air passage 6 on the downstream side of the cross flow fan 2.

  Since the flow of air flowing in from the intake portion 33 is in the same direction as the blowing direction by the cross flow fan 2, the blowing by the cross flow fan 2 is not disturbed. Further, since the cover member 30 surrounds the side of the cross flow fan 2, the air flow rate at the side end of the cross flow fan 2 decreases, but the air from the intake portion 33 moves toward the side end of the cross flow fan 2. Since it circulates, the flow volume of the ventilation at the side end of the cross flow fan 2 increases. Moreover, the space on the side of the cross flow fan 2 does not become negative pressure due to the sucked air, so that it is possible to prevent inflow of air that has not undergone heat exchange from the outside of the side wall 16. Therefore, the airflow loss of the crossflow fan 2 can be reduced, and the performance of the crossflow fan 2 can be fully exhibited.

(Second Embodiment)
In the air conditioner of the present embodiment, a large amount of air sucked from the air intake portion 33 of the cover member 30 flows toward the blade side of the cross flow fan 2. That is, the intake portion 33 is shaped so that the opening is larger on the inner side than on the outer side in the axial direction. Other configurations are the same as those of the first embodiment.

  As shown in FIG. 6, the intake part 33 is a triangular hole. The opening of the portion of the intake portion 33 that hangs on the blade is larger than the opening of the portion that hangs on the end plate. Thereby, sufficient air flows into the blades at the side ends of the cross flow fan 2, and the flow rate of air blown at the side ends of the cross flow fan 2 increases. Accordingly, the amount of air blown at the side end of the cross flow fan 2 is increased, and the air blowing efficiency is improved.

(Third embodiment)
Also in the air conditioner of the present embodiment, the air intake portion 33 of the cover member 30 is shaped such that a large amount of air that is sucked flows toward the blade side of the cross flow fan 2. Other configurations are the same as those of the first embodiment.

  As shown in FIG. 7, the air intake portion 33 is a slit cut out from the inner side edge of the ring portion 31 and has a shape that becomes narrower from the inner side toward the outer side in the axial direction. As a result, a large amount of air flows into the blades at the side end of the cross flow fan 2, the flow rate of the air flow at the side end of the cross flow fan 2 is increased, and the air loss at the side end of the cross flow fan 2 can be reduced.

  As described above, the air conditioner of the present invention is a cross-flow fan that blows air that has passed through the heat exchanger 1 and the heat exchanger 1 to the blower outlet 5 in the cabinet 3 in which the suction port 4 and the blower outlet 5 are formed. 2 is provided with a cover member 30 surrounding the side of the cross flow fan 2 so that air does not flow through the side of the cross flow fan 2, and heat is exchanged with the cover member 30. An intake portion 33 for taking in fresh air is formed.

  The cover member 30 can eliminate the disturbance of the air flow on the side of the cross flow fan 2. And by providing the intake part 33, the heat-exchanged air flows in, and the flow rate of the air blow at the side end of the cross flow fan 2 can be increased.

  The intake portion 33 is located on the upstream side in the blowing direction of the cross flow fan 2. As a result, only the heat-exchanged air is sucked into the side of the cross flow fan 2, and an air flow toward the downstream side can be generated on the side of the cross flow fan 2.

  The intake portion 33 is disposed so as to face the blades of the cross flow fan 2. Thereby, the air which flowed in from the intake part 33 flows toward the braid | blade of the side end of the crossflow fan 2, and can increase the flow volume of the ventilation in a side end.

  The cover member 30 has a ring portion 31 that surrounds the outer peripheral surface of the side end of the cross flow fan 2, and a plurality of intake portions 33 are formed in the ring portion 31. Thereby, the flow of the same direction as the flow of the main flow can be produced on the side of the cross flow fan 2 without obstructing the flow of the main flow in the blowing direction by the cross flow fan 2.

  The cover member 30 is formed using a plurality of members in the cabinet 3 that form an air passage 6 from the suction port 4 to the blowout port 5. Thereby, the space of the side of the cross flow fan 2 can be enclosed with few members.

  In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention. The air intake portion 33 of the cover member 30 may be provided only in one of the left and right ring portions 31. As another embodiment of the cover member 30, as shown in FIG. 8, a cover member 30 surrounding the side surface of the cross flow fan 2 may be used. A semi-disc-shaped side plate 35 facing the side surface of the cross flow fan 2 is formed integrally with the ring portion 31. The cover member 30 is attached to the back plate 10.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Cross flow fan 3 Cabinet 6 Air outlet 12 Guide wall 13 Drain pan unit 16 Side wall 17 Flange 30 Cover member 31 Ring part 33 Intake part

Claims (5)

A cabinet with an air passage from the suction port to the air outlet is provided with a heat exchanger and a crossflow fan that blows air that has passed through the heat exchanger to the air outlet , and the crossflow fan rotates on the side wall of the air passage An air conditioner that is supported in order to prevent a flow in a direction different from the blowing direction from occurring in the space between the end plate and the side wall of the cross flow fan. provided a cover member for surrounding the end, the cover member is formed an intake section for taking the heat exchanged air to the space, the intake unit air conditioner, characterized in that located closer to the center than the end plate . The air conditioner according to claim 1, wherein the intake portion is located upstream of the cross flow fan in the blowing direction. The air conditioner according to claim 1 or 2, wherein the air intake section is arranged to face a blade of the cross flow fan. The air conditioner according to any one of claims 1 to 3, wherein the cover member has a ring portion surrounding an outer peripheral surface of a side end of the cross flow fan, and a plurality of intake portions are formed in the ring portion. Machine. Cover member, an air conditioner according to claim 4, wherein the formed utilizing a plurality of members in the cabinet forming the air passage.

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