Patent Grant
9790961
This application claims the priority benefit of China application serial no. 201410145311.7, filed on Apr. 11, 2014. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
Technical Field
The invention relates to a blower and a method for decreasing eddy noise.
Related Art
Regarding current heat dissipation devices used in collaboration with electronic components, besides commonly used passive heat dissipation devices (for example, a heat sink, etc.), fans that produce airflow to achieve a forced cooling effect are also as commonly used heat dissipation devices. Along with product development and improvement of living standards, users have increasing demand on low-noise products, and the airflow noise generated when the fan is used to provide the forced cooling effect becomes one of the noises concerned by the user. Due to a flow field characteristic of a blower, a usage rate of the blower in thin type electronic products is gradually increased. Since a fan wheel in a fan frame of the blower is a rotation member, and a rotation speed of the fan wheel is relatively high, a wind noise is generated when a fan blade is rotated at a high speed to collide with air, which usually bothers the user. Fan-related patents include U.S. Patent publication No. 20110070109, U.S. Patent publication No. 20130189130 and U.S. Patent publication No. 20140003624 and China utility model patent No. 202560660.
The invention is directed to a blower, which has function of decreasing eddy noise.
The invention is directed to a method for decreasing eddy noise, which is adapted to decrease the eddy noise generated when a blower operates.
An embodiment of the invention provides a blower including a fan frame, a fan wheel, at least one induction element and a coil. The fan frame has in inlet and an outlet. The fan wheel is disposed in the fan frame and has a wheel hub and a plurality of fan blades connected to periphery of the wheel hub. The induction elements are disposed in the fan blades, the coil is disposed on the fan frame for driving the induction elements, such that the fan blades corresponding to the induction elements swing back and forth to generate a vibration sound.
In an embodiment of the invention, the vibration sound generated by the fan blades has a same frequency and amplitude with that of an eddy noise, and the vibration sound generated by the fan blades has an opposite phase with that of the eddy noise.
In an embodiment of the invention, the fan frame has a throat portion, and a space between the fan wheel and the fan frame is defined as a pressure zone and a pressure releasing zone, and a generation position of the eddy noise is near the throat portion.
In an embodiment of the invention, the induction elements are permanent magnets.
In an embodiment of the invention, the blower further includes a control circuit, the control circuit is electrically connected to the coil and supplies a current to the coil, and the coil generates a magnetic field to drive the induction elements, so as to drive the corresponding fan blades to swing back and forth to generate the vibration sound.
In an embodiment of the invention, the induction elements are piezoelectric materials.
In an embodiment of the invention, the control circuit controls a frequency, an intensity and a phase of the current supplied to the coil, so as to correspondingly change a frequency, an amplitude and a phase of the vibration sound.
In an embodiment of the invention, the blower further includes a microphone electrically connected to the control circuit for detecting a frequency, an amplitude and a phase of the eddy noise.
In an embodiment of the invention, the coil surrounds the inlet.
In an embodiment of the invention, the coil is located near the throat portion.
In an embodiment of the invention, the coil surrounds the fan frame and is located between the outlet and the fan wheel.
In an embodiment of the invention, the induction elements are embedded in the corresponding fan blades.
In an embodiment of the invention, the blower further includes a motor, the fan wheel is located between the fan frame and the motor, and the fan wheel rotates relative to the fan frame.
Another embodiment of the invention provides a method for decreasing eddy noise, which is adapted to a blower. The blower includes a fan frame and a fan wheel disposed in the fan frame. The method for decreasing eddy noise includes following steps. First, a frequency, an amplitude and a phase of eddy noise generated when the fan wheel rotates are obtained. Then, at least one fan blade of the fan wheel of the blower is swung back and forth to generate a vibration sound according to the frequency, the amplitude and the phase of the eddy noise, where the vibration sound has a same frequency and amplitude with that of the eddy noise, and the vibration sound has an opposite phase with that of the eddy noise, such that the vibration sound and the eddy noise generated when the fan wheel rotates are counteracted to each other.
In an embodiment of the invention, the step of obtaining the frequency, the amplitude and the phase of the eddy noise includes reading data from a database, where the data is the frequency, the amplitude and the phase of the eddy noise corresponding to a current rotation speed of the fan wheel.
In an embodiment of the invention, the step of obtaining the frequency, the amplitude and the phase of the eddy noise includes detecting the frequency, the amplitude and the phase of the eddy noise through a microphone.
In an embodiment of the invention, the microphone is disposed near a throat portion of the fan frame.
In an embodiment of the invention, the step of swinging the at least one fan blade of the fan wheel of the blower back and forth to generate the vibration sound includes using a control circuit to supply a current to a coil of the fan frame to generate a magnetic field to drive at least one induction element fixed to the fan blades according to the frequency, the amplitude and the phase of the eddy noise, so as to drive the fan blade to swing back and forth to generate the vibration sound.
In an embodiment of the invention, the control circuit controls a frequency, an intensity and a phase of the current supplied to the coil, so as to correspondingly change a frequency, an amplitude and a phase of the vibration sound.
In an embodiment of the invention, the step of obtaining the frequency, the amplitude and the phase of the eddy noise includes detecting the frequency, the amplitude and the phase of the eddy noise through a microphone, where the microphone is electrically connected to the control circuit, and the control circuit supplies the current to the coil according to a detection result of the microphone.
According to the above descriptions, in the embodiment of the invention, a magnetic force (for example, the induction elements fixed to the fan blades and the coil supplied with electricity) is used to swing the fan blades of the fan wheel of the blower to generate the vibration sound, so as to counteract the eddy noise generated when the fan wheel rotates.
Other objectives, features and advantages of the invention will be further understood from the further technological features disclosed by the embodiments of the invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” etc., is used with reference to the orientation of the Figure(s) being described. The components of the invention can be positioned in a number of different orientations. As such, the directional terminology is used for purposes of illustration and is in no way limiting. On the other hand, the drawings are only schematic and the sizes of components may be exaggerated for clarity. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the invention. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected,” “coupled,” and “mounted” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. Similarly, the terms “facing,” “faces” and variations thereof herein are used broadly and encompass direct and indirect facing, and “adjacent to” and variations thereof herein are used broadly and encompass directly and indirectly “adjacent to”. Therefore, the description of “A” component facing “B” component herein may contain the situations that “A” component directly faces “B” component or one or more additional components are between “A” component and “B” component. Also, the description of “A” component “adjacent to” “B” component herein may contain the situations that “A” component is directly “adjacent to” “B” component or one or more additional components are between “A” component and “B” component. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
Referring to
In the embodiment, the fan frame 110 has a throat portion 116, and a space between the fan wheel 120 and the fan frame 110 is defined as a pressure zone P and a pressure releasing zone R. As shown in
In order to decrease the eddy noise, as shown in
In the embodiment, as shown in
In the embodiment, as shown in
In the embodiment, as shown in
In the embodiment, as shown in
In an embodiment, as shown in
In an embodiment, as shown in
In the embodiment, as shown in
In another embodiment, as shown in
In another embodiment, as shown in
In another embodiment, the induction element can be a piezoelectric material, and when the coil is supplied with electricity to generate the magnetic field, the magnetic field induces the induction coil on the piezoelectric material to generate a current, and the piezoelectric material swings back and forth due to the current, and drives the fan blade to swing to generate vibration sound.
In the aforementioned embodiments, the blower having a function of decreasing eddy noise is introduced. In the following embodiment, a method for decreasing eddy noise adapted to the blower is introduced below. It should be noticed that in the aforementioned embodiments of the blower, the method for decreasing eddy noise is also introduced. Therefore, the following embodiment related to the method for decreasing eddy noise can serve as a supplementary description of the aforementioned embodiments of the blower without limiting the aforementioned embodiments.
Referring to
In the embodiment, the step (S102) of obtaining the frequency, the amplitude and the phase of the eddy noise includes accessing a data from a database. For example, the frequencies, amplitudes and phases of the eddy noise generated under different rotation speeds of the fan wheel 120 can be concluded through data simulation or actual experiments, etc., and the concluded data is stored in the database. Therefore, a batch of data can be obtained from the database according to a current rotation speed of the fan wheel 120, where the obtained data is the frequency, the amplitude and the phase of the eddy noise corresponding to the current rotation speed of the fan wheel 120.
In the embodiment, the step (S102) of obtaining the frequency, the amplitude and the phase of the eddy noise further includes detecting the frequency, the amplitude and the phase of the eddy noise through the microphone 160. As shown in
In the embodiment, the step (S104) of swinging the at least one fan blade 124 of the fan wheel 120 of the blower 100 back and forth to generate the vibration sound includes supplying a current to the coil 140 of the fan frame 110 to generate a magnetic field to drive the induction elements 130 fixed to the fan blades 124 according to the frequency, the amplitude and the phase of the eddy noise through the control circuit 150, so as to drive the fan blades 124 to swing back and forth to generate the vibration sound. The control circuit 150 can control a frequency, an intensity and a phase of the current supplied to the coil 140, so as to correspondingly change a frequency, an amplitude and a phase of the vibration sound. In case that the microphone 160 is used to detect the frequency, the amplitude and the phase of the eddy noise, the control circuit 150 electrically connected to the microphone 160 can supply the current to the coil 140 according to a detection result of the microphone 160.
In summary, in the embodiments of the invention, a magnetic force (for example, the induction elements fixed to the fan blades and the coil supplied with electricity) is used to swing the fan blades of the fan wheel of the blower to generate the vibration sound, so as to counteract the eddy noise generated when the fan wheel rotates. The vibration sound and the eddy noise may have the same frequency and amplitude and have opposite phases, such that the vibration sound and the eddy noise can be counteracted to each other, so as to improve the effect of decreasing the eddy noise. The vibration sound can be generated according to basic parameters (for example, frequency, amplitude and phase) of the eddy noise corresponding to the rotation speed of the fan wheel, or according to basic parameters of the eddy noise detected by the microphone, so as to decrease the eddy noise in real-time.
The foregoing description of the preferred embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the invention and its best mode practical application, thereby to enable persons skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the invention”, “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred. The invention is limited only by the spirit and scope of the appended claims. The abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the invention. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the invention as defined by the following claims. Moreover, no element and component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims.
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