Blower and heat pump utilizing said blower

Abstract

The peripheral edge at the rear edge of a propeller fan (3), which is driven by a motor (6) serving as a propeller fan driver, is covered with a bell-mouth (4). Multiple plates, namely, a top plate (8), a bottom plate (9), and side plates (10) which constitute an intake-side air duct on the outside of the propeller fan in the radial direction, and a machine room plate (11) are provided. In the cross-section of the bell-mouth at the position where the blades of the propeller fan are closest front to back at a position on the plates where the distance between the propeller fan and the plates that constitute the air duct on the outside in the radial direction is relatively small, the widening angle (?1) of the bell-mouth on the intake-side is set smaller, and the height (Hb) of overlap of the propeller fan and the bell-mouth is set higher, than those in the cross-section at the position where the distance between the propeller fan and the plates is relatively large, and the cross-sectional shape of the bell-mouth is changed gradually between the two positions.

Description

technical field [0001] The present invention relates to a blower provided with a bell mouth and an impeller, and a heat pump device using the blower. Background technique [0002] In devices equipped with blowers such as blowers in the form of propeller fans and outdoor units of air conditioners (hereinafter referred to as air conditioner outdoor units), it is essential to reduce the disturbance of the airflow flowing into the blower as much as possible in order to reduce aerodynamic noise. ,change. [0003] In addition, in order to reduce the aerodynamic noise, it is also effective to increase the diameter of the impeller, reduce the relative velocity of the blade and the gas, or ensure the cross-sectional area of ​​the gas and reduce the absolute velocity of the gas. [0004] In order to minimize the turbulence and fluctuation of the airflow flowing into the blower, it is ideal to suck in air from a uniform and sufficient wide space in the circumferential direction center...

AI Technical Summary

Problems solved by technology

[0004] In order to minimize the turbulence and fluctuation of the airflow flowing into the blower, it is ideal to suck air from a uniform and sufficient wide space in the circumferential direction around the rotation axis, and the outdoor unit of the air conditioner equipped with a blower in the form of a propeller fan is used as an example. For example, usually, the suction space outside the radial direction of the impeller has multiple sides, and the cross section perpendicular to the fan rotation axis is roughly quadrangular. In many cases, the width of the space and the bell mouth cannot form a sufficiently large cross-sectional shape around the entire circumference.

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