Blower
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorHiroyasu Fujinaka
Life of this patent
Estimating the term…
Abstract
In a blower in which air is sucked to the inside through slits formed in an annular wall, the width w and the number of slits are so set that an air flow of 20 to 40% of the maximum air flow is sucked through the slits in a state in which the static pressure is zero. By this configuration, the fan stall inhibiting effect due to the air flow through the slits and the energy loss due to the viscosity of air yielded in the slits are balanced, whereby the efficiency of the blower can be improved.
Claims6
A blower having an annular wall spaced from a blade tip end of a fan and at least one slit formed in a portion opposed to the blade tip end of the annular wall for communication between inner and outer peripheral portions of the annular wall so that air is sucked to the inner peripheral portion of the annular wall through the slit as the fan rotates, wherein
- the width and the number of slits are so set that an air flow of 20 to 40% of the maximum air flow is sucked through the slits in a state in which the static pressure is zero.
A method for determining a slit shape for a blower having an annular wall spaced from a blade tip end of a fan and a slit formed at a portion opposed to the blade tip end of the annular wall for communication between inner and outer peripheral portions of the annular wall so that air is sucked to the inner peripheral portion of the annular wall through the slit as the fan rotates, wherein
- the shape of the slit is so determined that an air flow of 20 to 40% of the maximum air flow is sucked through the slit in a state in which the static pressure is zero.
Dependencies are inferred from the claim text.