TWI775035B

TWI775035B - Heat dissipation fan

Info

Publication number: TWI775035B
Application number: TW109100989A
Authority: TW
Inventors: 黃瀚樑; 廖文能; 謝錚玟; 陳聖諺; 林育民; 王俊傑
Original assignee: 宏碁股份有限公司
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2022-08-21
Also published as: TW202126909A

Abstract

A heat dissipation fan used for being disposed in an portable electronic device is provided. The heat dissipation fan includes a housing and a blade wheel disposed in the housing. The housing includes an inlet and a noise reduction structure disposed around the inlet. The blade wheel has a plurality of metal blades. An air flow entering the housing by passing the noise reduction structure is affected by the noise reduction structure so as to generate a plurality of air streamlines with different pressures and vibration frequencies, and then the blade wheel drives the air flow out of the housing.

Description

散熱風扇cooling fan

本發明是有關於一種風扇，且特別是一種散熱風扇。 The present invention relates to a fan, and particularly a cooling fan.

現有可攜式電子裝置，例如筆記型電腦等，其運算系統包括諸如處理器、顯示晶片等熱產生元件，因此需以風扇和其他冷卻解決方案來消散操作期間產生的熱量。 Existing portable electronic devices, such as notebook computers, etc., whose computing systems include heat-generating components such as processors and display chips, require fans and other cooling solutions to dissipate the heat generated during operation.

雖然現有技術的冷卻解決方案在特定環境下仍屬適合，但其實尚留有顯著的改良空間。舉例來說，風扇葉片以固定頻率或轉速所進行的旋轉，其會在運算系統中產生可聽到的噪音。特別是，常會為了增加散熱效能而採用增大風扇氣流的手段，例如增加風扇的葉片面積，卻往往也是提升其噪音的主要原因。 While the cooling solutions of the prior art may still be suitable in certain circumstances, there is significant room for improvement. For example, the rotation of fan blades at a fixed frequency or rotational speed can produce audible noise in the computing system. In particular, measures to increase the airflow of the fan are often used to increase the heat dissipation efficiency, such as increasing the area of the fan blades, but this is often the main reason for increasing the noise.

因此，在滿足散熱效能的前提下，同時還需追求其靜謐程度，實為現今相關技術人員所需面臨的重大課題。 Therefore, on the premise of satisfying the heat dissipation performance, it is also necessary to pursue the degree of quietness, which is a major issue that the relevant technical personnel need to face today.

本發明提供一種散熱風扇，藉由降噪結構破壞氣流而產生不同壓力的空氣流線並伴隨不同震動頻率，以有效地降低噪音。 The present invention provides a cooling fan, which destroys the airflow through a noise reduction structure to generate air flow lines with different pressures accompanied by different vibration frequencies, so as to effectively reduce noise.

本發明的散熱風扇，配置於可攜式電子裝置。散熱風扇包括外殼與葉輪。外殼具有入風口與降噪結構。降噪結構沿入風口的周緣配置。葉輪設置於外殼內，且葉輪具有金屬葉片。經由入風口進入散熱風扇的氣流受降噪結構破壞而產生多個不同壓力的空氣流線且伴隨不同震動頻率，再受葉輪驅使而傳送出外殼。 The cooling fan of the present invention is arranged in a portable electronic device. The cooling fan includes a casing and an impeller. The housing has an air inlet and a noise reduction structure. The noise reduction structure is arranged along the periphery of the air inlet. The impeller is arranged in the casing, and the impeller has metal blades. The air flow entering the cooling fan through the air inlet is destroyed by the noise reduction structure, resulting in a plurality of air streamlines with different pressures and with different vibration frequencies, and then driven by the impeller to be transmitted out of the casing.

基於上述，散熱風扇在其入風口處的周緣設置降噪結構，以利用降噪結構將行經入風口的氣流破壞分成多個不同壓力的空氣流線並伴隨不同震動頻率，據以改變入風口處的流場。此舉利用風扇的外殼對流入的氣流產生結構性破壞，進而能有效地避免氣流因頻率共振而產生的噪音。 Based on the above, the cooling fan is provided with a noise reduction structure on the periphery of the air inlet, so as to use the noise reduction structure to break the airflow passing through the air inlet into multiple air streamlines with different pressures and with different vibration frequencies. flow field. This makes use of the casing of the fan to structurally damage the inflowing airflow, thereby effectively avoiding the noise generated by the airflow due to frequency resonance.

為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。 In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

100:電子裝置 100: Electronics

110:外殼 110: Shell

112、114:部件 112, 114: Components

116、216:降噪結構 116, 216: Noise reduction structure

120:輪轂 120: Wheels

130:葉片 130: Blade

A1、A2、A3:切口 A1, A2, A3: Cutouts

B1、B2、B3:凸起 B1, B2, B3: Raised

C1、C2、C3:折片 C1, C2, C3: flaps

d1、d2、d3:橫向尺寸 d1, d2, d3: horizontal dimension

N1、N2:入風口 N1, N2: air inlet

N3:出風口 N3: air outlet

X-Y-Z:直角座標 X-Y-Z: Cartesian coordinates

圖1是依據本發明一實施例的散熱風扇的***圖。 FIG. 1 is an exploded view of a cooling fan according to an embodiment of the present invention.

圖2是圖1的散熱風扇的俯視圖。 FIG. 2 is a plan view of the cooling fan of FIG. 1 .

圖3是本發明另一實施例的散熱風扇的外殼局部示意圖。 3 is a partial schematic diagram of a casing of a cooling fan according to another embodiment of the present invention.

圖1是依據本發明一實施例的散熱風扇的***圖。圖2是圖1的散熱風扇的俯視圖。同時提供直角座標X-Y-Z以利於構件描述。請同時參考圖1與圖2，在本實施例中，散熱風扇100是離心式風扇，配置於可攜式電子裝置(未繪示)，例如是筆記型電腦，散熱風扇100包括外殼110與設置在外殼110內的葉輪(包括輪轂120與葉片130)，其中外殼110由部件112與部件114所構成，並據以使外殼110沿Z軸設置有入風口N1、N2以及出風口N3。葉片130環繞輪轂120配置，且以動力源(例如馬達，在此未繪示)驅動輪轂120而讓葉片130隨輪轂120轉動，進而使周邊空氣得以從入風口N1、N2被吸入散熱風扇100，並從出風口N3吹出。此處例如是將熱源(未繪示)直接置於出風口N3處，或藉由熱管傳熱至設置在出風口N3處的鰭片組)，以讓散熱風扇100對熱源或鰭片組進行散熱。在圖2中，以虛線箭號繪示氣流的流向與狀態。 FIG. 1 is an exploded view of a cooling fan according to an embodiment of the present invention. FIG. 2 is a plan view of the cooling fan of FIG. 1 . At the same time, the Cartesian coordinates X-Y-Z are provided to facilitate the construction item description. Please refer to FIG. 1 and FIG. 2 at the same time. In this embodiment, the cooling fan 100 is a centrifugal fan, which is disposed in a portable electronic device (not shown), such as a notebook computer. The cooling fan 100 includes a casing 110 and a set of The impeller (including the hub 120 and the blades 130 ) in the casing 110 , wherein the casing 110 is composed of the components 112 and 114 , and accordingly, the casing 110 is provided with air inlets N1 , N2 and N3 along the Z axis. The blades 130 are arranged around the hub 120, and the hub 120 is driven by a power source (such as a motor, not shown here) to make the blades 130 rotate with the hub 120, so that the surrounding air can be drawn into the cooling fan 100 from the air inlets N1 and N2, And blow out from outlet N3. Here, for example, the heat source (not shown) is directly placed at the air outlet N3, or the heat is transferred to the fin set at the air outlet N3 by means of a heat pipe), so that the cooling fan 100 can perform heat transfer on the heat source or the fin set. heat dissipation. In FIG. 2 , the flow direction and state of the air flow are shown by dashed arrows.

葉片130是以金屬材質沖壓而製成，輪轂120的材質為塑膠或壓鑄用金屬，因此，輪轂120能經由射出成型(塑膠)或壓鑄(金屬)而與葉片130相互結合。進一步的說，在葉片130製作完成之後可放置於模具(未繪示)內，並將塑膠或是加熱後呈現液態之金屬流入模具內並包覆葉片130，使其成形後的輪轂120成型並固定葉片130。在另一實施例中，輪轂120與葉片130則是分別形成，然其分別預留接合結構(例如能彼此對應的嵌合槽與嵌合凸部)，之後再將葉片130逐一干涉嵌合至輪轂120。 The blade 130 is made of metal material by stamping, and the material of the hub 120 is plastic or metal for die casting. Therefore, the hub 120 can be combined with the blade 130 by injection molding (plastic) or die casting (metal). Further, after the blade 130 is fabricated, it can be placed in a mold (not shown), and plastic or metal that is liquid after heating flows into the mold and covers the blade 130, so that the formed hub 120 is formed and formed. Fixed vane 130 . In another embodiment, the hub 120 and the blades 130 are formed separately, but they are respectively reserved for engaging structures (for example, a fitting groove and a fitting convex portion that can correspond to each other), and then the blades 130 are interfered and fitted to each other one by one. Wheel hub 120 .

上述製程僅為舉例說明，本發明不以上述製程為限。以第二種製程為例，由於這些葉片130可以單獨製作再組裝至輪轂 120，因此葉片130可以藉由金屬材質的延展性來降低厚度，而使每個葉片130之間的空間也隨之增加，進而提昇輪轂120帶動葉片130旋轉時所產生的氣流量。另一方面，降低葉片130的厚度也可以使散熱風扇100配置有更多數量的葉片130，進而提昇其旋轉時所產生的氣流流量。據此，當本實施例的散熱風扇100用於可攜式電子裝置時，便能藉此提供氣流至機體內部，進而使氣流挾帶熱源所產生的熱量並散逸至機體外部而進行有效地散熱。 The above-mentioned process is only for illustration, and the present invention is not limited to the above-mentioned process. Taking the second process as an example, since these blades 130 can be fabricated separately and then assembled to the hub Therefore, the thickness of the blades 130 can be reduced by the ductility of the metal material, so that the space between each blade 130 is also increased, thereby increasing the airflow generated when the hub 120 drives the blades 130 to rotate. On the other hand, reducing the thickness of the blades 130 can also enable the cooling fan 100 to be equipped with a larger number of blades 130, thereby increasing the airflow generated when the cooling fan 100 is rotated. Accordingly, when the cooling fan 100 of this embodiment is used in a portable electronic device, it can provide airflow to the inside of the body, so that the airflow can carry the heat generated by the heat source and dissipate it to the outside of the body to effectively dissipate heat. .

值得注意的是，本實施例的外殼110還具有降噪結構116，其沿著入風口N1的周緣配置。在此，降噪結構116具有不規則外形，且呈現出環狀幾何結構。也就是改變現有平滑邊緣的入風口，而使本實施例的外殼110在入風口N1呈現不連續且非平整結構。 It is worth noting that the housing 110 of this embodiment also has a noise reduction structure 116, which is disposed along the periphery of the air inlet N1. Here, the noise reduction structure 116 has an irregular shape and exhibits a ring geometry. That is, the existing air inlet with smooth edges is changed, so that the casing 110 of this embodiment presents a discontinuous and non-flat structure at the air inlet N1.

請同時參考圖1與圖2，進一步地說，本實施例的降噪結構116是呈鋸齒狀，也就是由多個凸起(凸起B1、凸起B2、凸起B3)與多個切口(切口A1、切口A2、切口A3)交錯配置而成，且重要的是，任意相鄰的兩凸起(例如凸起B1、凸起B2)，任意相鄰的兩切口(例如切口A1、切口A2)，或任意相鄰的凸起與切口(例如凸起B1、切口A1)，皆具有不同的外形輪廓，也就是上述的不規則外形。 Please refer to FIG. 1 and FIG. 2 at the same time. Further, the noise reduction structure 116 of the present embodiment is in a zigzag shape, that is, consists of a plurality of protrusions (a protrusion B1, a protrusion B2, and a protrusion B3) and a plurality of notches (cut A1, cut A2, cut A3) are staggered, and it is important that any adjacent two protrusions (such as protrusion B1, protrusion B2), any adjacent two cuts (such as cut A1, cut A2), or any adjacent protrusions and incisions (eg, protrusions B1, incisions A1), all have different contours, that is, the above-mentioned irregular contours.

如此一來，當葉輪轉動而將外部空氣吸入時，所形成的氣流在行經入風口N1將會被降噪結構116破壞，並據以產生不同壓力的空氣流線且伴隨不同的震動頻率。換句話說，相較於現有風扇是具備平滑結構的入風口，隨著葉輪是以固定轉速進行旋轉，往往會因此讓氣流流入外殼時是存在相同震動頻率，如此便容易因共振而產生噪音。有鑒於此，本實施例的散熱風扇100便是藉由位在入風口N1處的降噪結構116，以將固定波型的氣流破碎化，正如圖2所示意者，對應三種不同的切口A1、A2與A3，即代表氣流在該處會因此而形成三種不同壓力的空氣流線，進而伴隨震動頻率彼此不同，因而能有效地抑制噪音。一般而言，本實施例因所述降噪結構116的存在而能有效使噪音降低5%至10%。 In this way, when the impeller rotates to inhale the outside air, the formed air flow will be destroyed by the noise reduction structure 116 when passing through the air inlet N1, and accordingly, air streamlines with different pressures and different vibration frequencies are generated. In other words, compared to the existing The fan is an air inlet with a smooth structure. As the impeller rotates at a fixed speed, the same vibration frequency is often present when the airflow flows into the casing, so it is easy to generate noise due to resonance. In view of this, the cooling fan 100 of this embodiment uses the noise reduction structure 116 located at the air inlet N1 to break up the airflow of the fixed wave pattern, as shown in FIG. 2 , corresponding to three different incisions A1 , A2 and A3, which means that the airflow will form three air streamlines with different pressures, and then the vibration frequencies will be different from each other, so the noise can be effectively suppressed. Generally speaking, the present embodiment can effectively reduce the noise by 5% to 10% due to the existence of the noise reduction structure 116 .

本實施例是以三種不同外形的凸起B1、B2、B3搭配三種不同外形的切口A1、A2、A3形成一群組，並再以多個群組重複環繞入風口N1而形成多頻率輪廓的降噪結構116，也就是相鄰兩個結構輪廓雖然相異，但仍能以相同群組而以固定頻率重現於入風口N1的周緣。 In this embodiment, three different shapes of protrusions B1, B2, B3 are combined with three different shapes of notches A1, A2, A3 to form a group, and multiple groups are repeated to surround the air inlet N1 to form a multi-frequency profile. The noise reduction structure 116 , that is, although the contours of two adjacent structures are different, they can still be reproduced in the same group at the periphery of the air inlet N1 at a fixed frequency.

但，本實施例不因此受限其結構特徵，也就是說，舉凡符合前述任意相鄰的結構輪廓是彼此相異的不規則輪廓，皆可適合地配置在外殼110的入風口N1處。在其他未繪示的實施例中，降噪結構也能是沿入風口N1的周緣而設置無一重複輪廓的不規則結構。 However, the present embodiment is not limited to its structural features, that is, any irregular contours that conform to any of the aforementioned adjacent structural contours that are different from each other can be appropriately disposed at the air inlet N1 of the housing 110 . In other non-illustrated embodiments, the noise reduction structure can also be an irregular structure without repeating contours disposed along the periphery of the air inlet N1.

在本實施例中，雖然降噪結構116適配置在外殼110的部件112，但對於另一入風口N2而言，其也能配置相同或類似的降噪結構116。無論何者，所述降噪結構116可通過對金屬板件進行沖壓而取得，因此有利於降低散熱風扇100的製程難度及製作成本。 In this embodiment, although the noise reduction structure 116 is adapted to be disposed on the component 112 of the housing 110 , the same or similar noise reduction structure 116 can also be configured for the other air inlet N2 . In any case, the noise reduction structure 116 can be It is obtained by stamping, so it is beneficial to reduce the manufacturing difficulty and manufacturing cost of the cooling fan 100 .

圖3是本發明另一實施例的散熱風扇的外殼局部示意圖。請參考圖3，在此需先提及的是，其顯示的部分相當於圖1實施例中部件112的背面，也就是部件112面對葉輪的表面，因此與前述實施例相同的部分，在後續文字敘述中，將以相同標號敘述相同構件。 3 is a partial schematic diagram of a casing of a cooling fan according to another embodiment of the present invention. Please refer to FIG. 3 . It should be mentioned here that the part shown is equivalent to the back of the component 112 in the embodiment of FIG. 1 , that is, the surface of the component 112 facing the impeller. In the subsequent text description, the same components will be described with the same reference numerals.

本實施例與前述實施例不同的是，降噪結構216還包括設置在外殼110(部件112)內緣的折片(在此以折片C1、C2與C3為例)，且相鄰的兩折片C1、C2與C3是具有不同外形輪廓。如圖3所示，折片C1、C2與C3分別具有不同的橫向尺寸d1、d2、d3(在另一實施例中，其也可讓折片C1、C2與C3分別具有不同的縱向尺寸)。此舉讓本實施例的散熱風扇也能達到前述實施例的破壞氣流波型(flow waveform)的效果，且由於本實施例的折片C1、C2與C3是以金屬板件沖壓出凸部B1、B2、B3之後，再向外殼110的內部彎折而成，因此除了與前述相同造成不同壓力的空氣流線(不同震動頻率的氣流)之外，折片C1、C2與C3的延伸方向(縱向)實質上是從部件112的內表面朝向葉片130延伸，因此還具有能將氣流導引與匯集至葉片130的功能。 The difference between this embodiment and the previous embodiment is that the noise reduction structure 216 further includes a folded sheet (here, the folded sheets C1, C2 and C3 are taken as examples) arranged on the inner edge of the casing 110 (component 112 ), and two adjacent folds The flaps C1, C2 and C3 have different contours. As shown in FIG. 3 , the flaps C1 , C2 and C3 have different lateral dimensions d1 , d2 , and d3 respectively (in another embodiment, the flaps C1 , C2 and C3 can also have different longitudinal dimensions respectively) . This allows the cooling fan of this embodiment to achieve the effect of destroying the flow waveform of the previous embodiment, and since the folds C1, C2 and C3 of this embodiment are formed by stamping the convex portion B1 from a metal plate , B2, B3, and then bent to the inside of the casing 110. Therefore, except for the same air flow lines (airflows with different vibration frequencies) that cause different pressures as described above, the extension directions of the folds C1, C2 and C3 ( Longitudinal direction) substantially extends from the inner surface of the member 112 toward the vanes 130 , and thus also has the function of guiding and collecting the airflow to the vanes 130 .

綜上所述，在本發明的上述實施例中，散熱風扇在其入風口處的周緣設置降噪結構，以利用降噪結構將行經入風口的氣流破壞分成多個不同壓力的空氣流線並伴隨不同震動頻率，據以改變入風口處的流場。此舉利用風扇的外殼對流入的氣流產生結構性破壞，進而能有效地避免氣流因頻率共振而產生的噪音。 To sum up, in the above-mentioned embodiments of the present invention, the cooling fan is provided with a noise reduction structure on the periphery of the air inlet, so as to use the noise reduction structure to break the airflow passing through the air inlet into multiple air streamlines of different pressures and With different vibration frequencies, according to Change the flow field at the air inlet. This makes use of the casing of the fan to structurally damage the inflowing airflow, thereby effectively avoiding the noise generated by the airflow due to frequency resonance.

換句話說，散熱風扇利用不規則的上蓋結構破壞風扇進氣的流場，使空氣流動產生不規則流場頻率，進而使風扇噪音大幅降低，且進而能提升散熱效率。 In other words, the cooling fan uses the irregular upper cover structure to destroy the flow field of the fan intake air, so that the air flow generates an irregular flow field frequency, thereby greatly reducing the fan noise, and further improving the heat dissipation efficiency.

雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。 Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

100:電子裝置100: Electronics

110:外殼110: Shell

112、114:部件112, 114: Components

116:降噪結構116: Noise reduction structure

120:輪轂120: Wheels

130:葉片130: Blade

A1、A2、A3:切口A1, A2, A3: Cutouts

B1、B2、B3:凸起B1, B2, B3: Raised

N1、N2:入風口N1, N2: air inlet

N3:出風口N3: air outlet

X-Y-Z:直角座標X-Y-Z: Cartesian coordinates

Claims

一種散熱風扇，配置於可攜式電子裝置，該散熱風扇包括：一外殼，具有單一入風口與一降噪結構，該降噪結構沿該入風口的周緣配置；以及一葉輪，設置於該外殼內，該葉輪具有金屬葉片，其中該散熱風扇是離心式風扇，氣流沿軸向經由該入風口進入該外殼，且該氣流沿徑向經由出風口吹出該外殼，經由該入風口進入該外殼的該氣流，受該降噪結構的破壞而產生多個不同壓力的空氣流線且伴隨不同震動頻率，其中該降噪結構是由沿該徑向的多個凸起與沿該徑向的多個切***錯而成，且以固定頻率形成於該入風口的周緣，而呈現多頻率輪廓。 A cooling fan is arranged in a portable electronic device, the cooling fan comprises: a casing with a single air inlet and a noise reduction structure, the noise reduction structure is arranged along the periphery of the air inlet; and an impeller arranged in the casing Inside, the impeller has metal blades, wherein the cooling fan is a centrifugal fan, the airflow enters the casing through the air inlet in the axial direction, and the airflow is blown out of the casing through the air outlet in the radial direction, and enters the casing through the air inlet. The airflow is destroyed by the noise reduction structure to generate a plurality of air streamlines of different pressures and accompanied by different vibration frequencies, wherein the noise reduction structure is composed of a plurality of protrusions along the radial direction and a plurality of air flow lines along the radial direction. The incisions are staggered and formed on the periphery of the air inlet at a fixed frequency to present a multi-frequency profile.

如申請專利範圍第1項所述的散熱風扇，其中該降噪結構具有不規則外形。 The cooling fan according to claim 1, wherein the noise reduction structure has an irregular shape.

如申請專利範圍第1項所述的散熱風扇，其中該降噪結構是該外殼在該入風口處的環狀幾何結構。 The cooling fan of claim 1, wherein the noise reduction structure is an annular geometric structure of the casing at the air inlet.

如申請專利範圍第1項所述的散熱風扇，其中該降噪結構呈鋸齒狀。 The cooling fan according to claim 1, wherein the noise reduction structure has a sawtooth shape.

如申請專利範圍第1項所述的散熱風扇，其中該降噪結構是該外殼在該入風口處的不連續且非平整結構。 The cooling fan of claim 1, wherein the noise reduction structure is a discontinuous and non-flat structure of the casing at the air inlet.

如申請專利範圍第1項所述的散熱風扇，其中任意相鄰的兩個凸起、任意相鄰的兩個切口或是任意相鄰的一切口與一凸起具有不同外形。 The cooling fan according to claim 1, wherein any two adjacent protrusions, any adjacent two incisions, or any adjacent one incision and a protrusion have different shapes.

如申請專利範圍第1項所述的散熱風扇，其中該降噪結構是以金屬板件沖壓而成。 The cooling fan according to claim 1, wherein the noise reduction structure is punched from a metal plate.

如申請專利範圍第1項所述的散熱風扇，其中該降噪結構還具有設置在該外殼內緣的至少一折片。 The cooling fan according to claim 1, wherein the noise reduction structure further has at least one folded sheet disposed on the inner edge of the casing.

如申請專利範圍第8項所述的散熱風扇，其中該降噪結構具有多個折片，且任意相鄰的兩折片具有不同外形。 The cooling fan according to claim 8, wherein the noise reduction structure has a plurality of folds, and any two adjacent folds have different shapes.

如申請專利範圍第8項所述的散熱風扇，其中該折片是以金屬板件沖壓出凸部之後，再向該外殼內部彎折而成。 The cooling fan as described in claim 8, wherein the folded piece is formed by punching out a convex portion from a metal plate, and then bending it to the inside of the casing.