Blower device

A blower device comprising:

• a centrifugal blower including a centrifugal fan configured to rotate about an axis, suck air from one side of the blower device in an axial direction of the centrifugal fan, and blow the air outward in a radial direction of the centrifugal fan from a center located at the axis;
• an air flow guide disposed between the centrifugal fan and an other side of the blower device in the axial direction;
• a casing accommodating the centrifugal fan and allowing the air to flow as an air flow toward the other side in the axial direction;
• and
• a cooling heat exchanger accommodated in the casing, disposed between the air flow guide and the other side in the axial direction, wherein
• the air flow from the centrifugal fan includes:
• a first air flow that is from the centrifugal fan, bent toward the other side in the axial direction, and then toward the other side in the axial direction;
• and
• a second air flow that is from the centrifugal fan, bent toward the other side in the axial direction, and then bent inward in the radial direction,
• a first pressure loss is a pressure loss generated in the first air flow between the centrifugal fan and an end of the air flow guide facing the other side in the axial direction,
• a second pressure loss is a pressure loss generated in the second air flow between the centrifugal fan and the end of the air flow guide facing the other side in the axial direction,
• a first pressure loss ratio is a divided value obtained by dividing the second pressure loss by the first pressure loss,
• a third pressure loss is a pressure loss generated in the first air flow between the centrifugal fan and an end of the air flow guide facing the one side in the axial direction,
• a fourth pressure loss is a pressure loss generated in the second air flow between the centrifugal fan and the end of the air flow guide facing the one side in the axial direction,
• a second pressure loss ratio is a divided value obtained by dividing the fourth pressure loss by the third pressure loss,
• the air flow guide is configured to make the first pressure loss ratio smaller than the second pressure loss ratio,
• the casing is a casing for a vehicle air conditioner,
• the casing forms the air flow guide configured to generate the first pressure loss in the first air flow by obstructing the first air flow toward the other side in the axial direction,
• the air flow guide includes an inlet-side casing, a guide casing, and an outlet-side casing,
• the inlet-side casing, the guide casing, and the outlet-side casing are connected to each other in the axial direction to form an air flow passage within the inlet-side casing, the guide casing, and the outlet-side casing,
• the centrifugal blower is disposed in the inlet-side casing,
• a cross-sectional area of the air flow passage of the outlet-side casing is smaller than a cross-sectional area of the air flow passage of the inlet-side casing,
• a distance between the guide casing and the axis of the centrifugal fan in a radial direction decreases in the axial direction from one side to the other side,
• the cooling heat exchanger is configured to cool the first air flow and the second air flow that have passed through the air flow guide,
• the cooling heat exchanger is disposed in the outlet-side casing,
• the air flow guide further includes an upstreaming casing,
• the upstreaming casing is connected to the one side of the inlet-side casing in the axial direction to form the air flow passage within the inlet-side casing, the guide casing, the outlet-side casing and the upstreaming casing,
• a cross-sectional area of the upstreaming casing is equal to a cross-sectional area of the inlet-side casing, and
• the upstreaming casing is disposed upstream of the centrifugal blower.