1. Field of the Invention
The present invention relates to a heat-dissipating fan housing and, more particularly, to a heat-dissipating fan housing with stationary blades.
2. Description of the Related Art
The primary objective of the present invention is to provide a heat-dissipating fan housing that provides concentrated airflows after passing through the stationary blades to reduce the noise and to increase the wind pressure.
The heat-dissipating fan housing according to the preferred teachings of the present invention includes a casing having a compartment with two ends respectively defining an air inlet and an air outlet spaced in an axial direction. The compartment includes an impeller section, a stationary blade section, and an airflow concentration section arranged from the air inlet toward the air outlet. The stationary blade section is between the impeller section and the airflow concentration section in the axial direction. The impeller section is adapted for rotatably receiving an impeller. A mounting portion is received in the compartment. The impeller is adapted to be rotatably coupled to the mounting portion for driving airflows to enter the casing via the air inlet and to exit the casing via the air outlet. A plurality of stationary blades is interconnected between the casing and the mounting portion. The stationary blades are received in the stationary blade section. Each stationary blade includes a first edge facing the air inlet and a second edge facing the air outlet. The airflow concentration section is between the second edge of each stationary blade and the air outlet in the axial direction. The airflow concentration section concentrates the airflows after passing through the stationary blades. The noise is reduced, the wind pressure is increased, and less electricity is consumed.
Preferably, the casing has an axial length in the axial direction. The second edge of each stationary blade has a first axial spacing to the air outlet in the axial direction. The first edge of each stationary blade has a second axial spacing to the second edge of the stationary blade in the axial direction. The first axial spacing is at least 20% of the axial length. The second axial spacing is at least 10% of the axial length. The first axial spacing can be equal to the second axial spacing. Thus, the impeller section is still large enough to rotatably receive the impeller without adversely affecting the air output amount while providing the airflow concentration section for concentrating the airflows after passing through the stationary blades.
Preferably, each stationary blade includes an air incoming surface facing the air inlet. A section of the incoming surface adjacent the second edge is at an acute angle in a range between 60° and 75° with a plane perpendicular to the axial direction. Thus, the airflows created by rotating the impeller can be concentrated and not easy to diffuse after passing through the stationary blades and the airflow concentration section.
Preferably, the second edge of at least one of the stationary blades includes a guiding plate extending toward the air outlet into the airflow concentration section. The guiding plate further enhances the airflow concentration effect.
The present invention will become clearer in light of the following detailed description of illustrative embodiments of this invention described in connection with the drawings.
The illustrative embodiments may best be described by reference to the accompanying drawings where:
All figures are drawn for ease of explanation of the basic teachings of the present invention only; the extensions of the figures with respect to number, position, relationship, and dimensions of the parts to form the preferred embodiments will be explained or will be within the skill of the art after the following teachings of the present invention have been read and understood. Further, the exact dimensions and dimensional proportions to conform to specific force, weight, strength, and similar requirements will likewise be within the skill of the art after the following teachings of the present invention have been read and understood.
Where used in the various figures of the drawings, the same numerals designate the same or similar parts. Furthermore, when the terms “first”, “second”, “inner”, “outer”, “end”, “portion”, “section”, “axial”, “spacing”, “length”, and similar terms are used herein, it should be understood that these terms have reference only to the structure shown in the drawings as it would appear to a person viewing the drawings and are utilized only to facilitate describing the invention.
A heat-dissipating fan housing of an embodiment according to the preferred teachings of the present invention is shown in
The casing 10 includes a compartment 11 having two ends respectively defining an air inlet 12 and an air outlet 13 spaced in an axial direction. The compartment 11 includes an impeller section 111, a stationary blade section 112, and an airflow concentration section 113 arranged from the air inlet 12 toward the air outlet 13. The stationary blade section 112 is between the impeller section 111 and the airflow concentration section 113 in the axial direction.
The mounting portion 20 is received in the compartment 11 and substantially located in the stationary blade section 112. An impeller 40 and a stator forming main components of a motor are mounted to the mounting portion 20. The impeller 40 is rotatably coupled to the mounting portion 20 and rotatably received in the impeller section 111 for driving airflows to enter the casing 10 via the air inlet 12 and to exit the casing 10 via the air outlet 13 after passing through the impeller section 111, the stationary blade section 112, and the airflow concentration section 113, providing heat-dissipating function.
The stationary blades 30 are interconnected between the casing 10 and the mounting portion 20. In an example, a first end of each stationary blade 30 is coupled to an outer periphery of the mounting portion 20, and a second end of each stationary blade 30 is coupled or not coupled to an inner periphery of the casing 10. In another example, the first end of each stationary blade 30 is not coupled to the outer periphery of the mounting portion 20, and the second end of each stationary blade 30 is coupled to the inner periphery of the casing 10. The stationary blades 30 are received in the stationary blade section 112. Each stationary blade 30 includes a first edge 31 facing the air inlet 12 and a second edge 32 facing the air outlet 13. The airflow concentration section 113 is between the second edge 32 of each stationary blade 30 and the air outlet 13 in the axial direction.
The airflows flow in casing 10 in the axial direction perpendicular to a plane S. Each stationary blade 30 includes an air incoming surface 33 facing the air inlet 12. A section of the incoming surface 33 adjacent the second edge 32 is at an acute angle E in a range between 60° and 75° with the plane S. Thus, the airflows created by rotating the impeller 40 can be concentrated and not easy to diffuse after passing through the stationary blades 30 and the airflow concentration section 113.
It can be appreciated that the stationary blades 30 are located in the stationary blade section 112, and the airflow concentration section 113 is between the second edge 32 of each stationary blade 30 and the air outlet 13 in the axial direction. The airflows created by rotating the impeller 40 enter the casing 10 via the air inlet 12 and pass through the stationary blades 30 into the airflow concentration section 113. The airflow concentration section 113 concentrates the airflows after passing through the stationary blades 30. Thus, the airflows exiting the casing 10 are concentrated and, therefore, not easy to diffuse. Besides, the noise is reduced and the wind pressure is increased (
In the preferred form shown in
The heat-dissipating fan housing according to the preferred teachings of the present invention can be utilized in fans. When compared with a conventional heat-dissipating fan housing having the same power, the heat-dissipating fan housing according to the preferred teachings of the present invention has increased wind pressure and increased air output amount by providing the airflow concentration section 113. Namely, given the same wind pressure and the same air output amount, the heat-dissipating fan housing according to the preferred teachings of the present invention consumes less electricity.
Thus since the invention disclosed herein may be embodied in other specific forms without departing from the spirit or general characteristics thereof, some of which forms have been indicated, the embodiments described herein are to be considered in all respects illustrative and not restrictive. The scope of the invention is to be indicated by the appended claims, rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.