JP4244388B2 - Heat dissipation device, fan frame structure, heat dissipation system - Google Patents

Description

The present invention relates to a heat dissipation fan, its fan frame structure, and a heat dissipation system, and more particularly to a heat dissipation fan capable of reducing noise, its fan frame structure, and a heat dissipation system.

With the development of the performance of electronic devices, heat dissipation devices or heat dissipation systems have become one of the indispensable components in current electronic devices. This is because if the heat generated from the electronic device is not effectively dissipated, the performance of the electronic device is impaired and damage is caused.

The most widely used heat dissipation device at present is a fan as shown in Patent Document 1, for example. Referring to FIGS. 1A and 1B together, FIG. 1A shows a schematic view of a conventional fan, and FIG. 1B shows a cross-sectional view taken along line A-A ′ of FIG. 1. A conventional heat radiating fan 1 generally used is mainly composed of a fan frame 11 and an impeller 12. When the fan operates, the motor 13 drives the rotation of the impeller 12 to provide an air current to an electronic component (not shown) that generates heat, thereby achieving the purpose of heat dissipation from the electronic component. . The fan frame 11 has through holes that form the air inlet 112 and the air outlet 114 at both ends of the fan frame 11. The intake port 112 and the exhaust port 114 are connected by a central columnar passage 116, and the airflow provided by the impeller 12 is freely sucked and discharged. Also, the four corners of the fan frame 11 have a plurality of screw holes 14 so that the fan 1 can be fixed to the frame of an electronic device (such as a computer).

Referring to FIG. 1C, FIG. 1D, and FIG. 1E as a structure for improving the heat dissipation performance in the conventional heat radiating fan, these drawings are schematic views obtained by improving three types of fan frames in the conventional fan. Represents. The conventional fan forms an inclination angle C (FIG. 1C) or a lead angle D (FIG. 1D) in the vicinity of the intake port 112 or the exhaust port 114 of the fan frame 11 to reduce the area of intake or exhaust of airflow. It has increased. Alternatively, as shown in FIG. 1E, a part of the vicinity of the exhaust port 114 of the fan frame 11 is cut away to form a concave port E, thereby increasing the area for discharging the airflow. However, the recessed opening E formed by partially cutting the vicinity of the exhaust port 114 of the fan frame 11 can increase the discharge area of the airflow, but causes a disadvantage that the airflow is easily dispersed relative thereto. .

However, in any of the fan frames of FIGS. 1B, 1C, 1D, or 1E, when the airflow passes through the exhaust port 114, that is, flows out, the airflow directly contacts the inner peripheral wall of the columnar passage 116 (FIG. 1B), Alternatively, it directly contacts the inclination angle C, the lead angle D, or the wall portion of the recess E, blocks the air flow, slows the speed, and reduces the wind pressure. Furthermore, noise is generated due to the influence of the airflow being blocked, and when the rotation speed of the fan is increased, the noise level generated thereby is correspondingly increased.
JP 2002-345199 A

Therefore, in order to solve the above problems, the present invention reduces noise generated by friction between the airflow and the frame wall of the fan frame, stabilizes and concentrates the airflow, and improves performance. Provided are a heat dissipation fan having a smooth curved enlarged portion, a fan frame structure thereof, and a heat dissipation system.

In accordance with the objects of the present invention, a fan frame structure for a heat dissipation device is provided. The fan frame structure includes an outer frame having a columnar passage for guiding an air flow from one opening to the other opening, and an inner peripheral wall of the columnar passage on the side of at least one of the openings expands radially and outward. It has a smooth curved enlarged portion. The curved enlarged portion further includes a recess for forming a circulating flow in the airflow in order to prevent the subsequent airflow from directly contacting the frame wall of the outer frame. The curved enlarged portion is vertically symmetrical or bilaterally symmetrical with respect to the axis of the columnar passage, or the curved enlarged portion is enlarged radially and outwardly about the axis of the columnar passage, and outside the outer frame. Protruding. Further, the curved enlarged portion on the side of at least one opening is formed at a lead angle, an inclination angle, a lead inclination, or an arc angle.

In accordance with another object of the present invention, a fan frame structure for a heat dissipation device is further provided. The fan frame structure includes an outer frame having an intake port, an exhaust port, and a columnar passage that guides airflow from the intake port to the exhaust port, and the inner peripheral wall of the columnar passage on the exhaust port side is radially and outwardly. It has a smooth curved enlargement that expands. The curved enlarged portion further includes a recess for forming a circulating flow in the airflow in order to prevent the subsequent airflow from directly contacting the frame wall of the outer frame. The curved enlarged portion is vertically symmetrical or bilaterally symmetrical with respect to the axis of the columnar passage, or the curved enlarged portion is enlarged radially and outwardly about the axis of the columnar passage, and outside the outer frame. Protruding. The curved enlarged portion on the discharge port side is formed at a lead angle, an inclination angle, a lead inclination, or an arc angle.

Further, in the above fan frame structure, the inner peripheral wall of the columnar passage on the intake port side further expands radially and outwardly symmetrically vertically or horizontally with respect to the axis of the columnar passage, or The inner peripheral wall of the columnar passage on the side protrudes outward from the outer frame with respect to the axis of the columnar passage and expands radially and outwards, or expands radially and outwards in a circular or elliptical shape To do. The inner peripheral wall of the columnar passage on the inlet side with respect to the axis of the columnar passage is formed at a lead angle, an inclination angle, a lead inclination, or an arc angle.

According to another object of the present invention, a heat dissipation device having an impeller and a fan frame structure is further provided. The fan frame structure houses the impeller therein. The fan frame structure includes a columnar passage that guides the airflow from one opening to the other opening, and the inner peripheral wall of the columnar passage on the exhaust port side has a smoothly curved enlarged portion that expands radially and outward. Have. The curved enlarged portion further includes a recess for forming a circulating flow in the airflow in order to prevent a subsequent airflow from directly contacting the frame wall of the fan frame structure. The curved enlarged portion is vertically symmetrical or bilaterally symmetrical with respect to the axis of the columnar passage, or the curved enlarged portion on the exhaust port side is enlarged radially and outwardly with respect to the axis of the columnar passage, and Projects outside the fan frame structure. Further, the curved enlarged portion on the exhaust port side is formed at a lead angle, an inclination angle, a lead inclination, or an arc angle.

The heat dissipation device described above includes an axial flow fan. Further, the length of the impeller rotor blades increases along the radial direction of the curved enlarged portion. The heat dissipation device includes a motor base installed in the fan frame structure, the impeller is provided in the motor base, and the motor base has a radially inclined side portion to increase the area of intake or exhaust of airflow. Have. The side portion has a planar or curved surface. The fan frame structure is approximately square, circular, elliptical, or rhombus.

In accordance with another object of the present invention, a heat dissipation device including an impeller and a fan frame structure is provided. The fan frame structure houses the impeller therein. The fan frame structure includes an intake port, an exhaust port, and a columnar passage that guides airflow from the intake port to the exhaust port, and the inner peripheral wall of the columnar passage on the side of at least one of the openings expands radially and outward. A smooth curved enlarged portion. The curved enlarged portion further includes a recess for forming a circulating flow in the airflow in order to prevent the subsequent airflow from directly contacting the frame wall of the outer frame. The curved enlarged portion is vertically symmetrical or bilaterally symmetrical with respect to the axis of the columnar passage, or the curved enlarged portion is enlarged radially and outwardly about the axis of the columnar passage, and outside the outer frame. Protruding. Further, the curved enlarged portion on the side of at least one opening is formed at a lead angle, an inclination angle, a lead inclination, or an arc angle. Further, in the above-described fan frame structure, the inner peripheral wall of the columnar passage on the side of the intake port further expands radially and outwardly symmetrically vertically or horizontally with respect to the axis of the columnar passage, or the intake port The inner peripheral wall of the columnar passage on the side of the column further protrudes outward from the outer frame with respect to the axis of the columnar passage and expands radially and outward, or radially and outwardly in a circular or elliptical shape. Expanding. The inner peripheral wall of the columnar passage on the inlet side with respect to the axis of the columnar passage is formed at a lead angle, an inclination angle, a lead inclination, or an arc angle.

The heat dissipation device described above includes an axial flow fan. Further, the length of the impeller rotor blades increases along the radial direction of the curved enlarged portion. The heat dissipation device includes a motor base installed in the fan frame structure, the impeller is provided in the motor base, and the motor base has a radially inclined side portion to increase the area of intake or exhaust of airflow. Have. The side portion has a planar or curved surface. The fan frame structure is approximately square, circular, elliptical, or rhombus.

In accordance with another object of the present invention, a heat dissipation system is provided that includes a system frame, at least one electronic component provided in the system frame, and a heat dissipation device. The heat dissipation device is provided in the system frame and dissipates heat generated by the operation of at least one electronic component. The heat dissipation device includes an impeller and a fan frame structure that accommodates the impeller. Fan frame structure includes a columnar passage for guiding airflow from one opening to the other opening, and the inner circumferential wall of the columnar passages on the side of the at least one opening is smooth to expand and radially outwardly It has a curved enlarged portion.

In accordance with another object of the present invention, a heat dissipation system is provided that includes a system frame, at least one electronic component provided in the system frame, and a heat dissipation device. The heat dissipation device is provided in the system frame and dissipates heat generated by the operation of at least one electronic component. The heat dissipation device includes an impeller and a fan frame structure that accommodates the impeller. The fan frame structure includes an intake port, an exhaust port, and a columnar passage that guides airflow from the intake port to the exhaust port, and the inner peripheral wall of the columnar passage on the exhaust port side is expanded smoothly in a radial direction and outward. A curved enlarged portion.

The heat dissipating fan of the present invention, its fan frame structure, and the heat dissipating system have a curved enlarged portion to reduce noise due to friction between the air flow and the frame wall, and to stabilize and concentrate the air flow, Fan performance can be improved. In addition, it expands the inner peripheral wall of the fan frame structure to the outside without affecting other heat dissipation components installed on the fan, increasing the intake and exhaust area, and concentrating the airflow. As a result, the heat dissipation performance of the fan can be improved. Further, when assembling a fan or a fan frame structure in the system or other heat radiating components, it is not necessary to change the arrangement of the system or the heat radiating components.

In order that the objects, features, and advantages of the present invention will be more clearly understood, embodiments will be described below in detail with reference to the drawings.

Referring to FIGS. 2A and 2B together, FIG. 2A shows a schematic view of a fan according to an embodiment of the present invention, and FIG. 2B shows a cross-sectional view along the line BB ′ of FIG. 2A. ing. The heat dissipation device 2 of the present invention can be, for example, an axial fan, and includes a fan frame structure 21, an impeller 22, and a motor base 26. The fan frame structure 21 includes a frame having various shapes such as a substantially square shape, a circular shape, an oval shape, or a rhombus shape, that is, an outer frame, and the fan frame structure 21 includes a columnar passage 216. The fan frame structure 21 has a through hole including a columnar passage 216 formed in the fan frame structure 21 and an intake port 212 and an exhaust port 214 formed at both ends of the fan frame structure 21. The air inlet 212 and the air outlet 214 are connected by a columnar passage 216. The columnar passage 216 guides the airflow from one opening (ie, the air inlet 212) to the other opening (ie, the air outlet 214) and is generated by the impeller 22. The generated airflow is freely sucked and discharged by the fan frame structure 21. Also, the four corners of the fan frame structure 21 have a plurality of screw holes 24, thereby fixing the fan 2 to the frame of an electronic device (such as a computer).

The fan frame structure 21 accommodates the impeller 22, and the motor base 26 is also installed in the fan frame structure 21. The impeller 22 is installed on the motor base 26. When the fan 2 operates, the motor 23 installed in the motor base 26 drives the rotation of the impeller 22 to generate heat (not shown). The airflow can be provided and the purpose of heat dissipation can be achieved.

Subsequently, referring to FIGS. 2B and 3A together, FIG. 3A is a schematic view of the curved enlarged portion F in FIG. 2B and represents the direction of air flow. The inner peripheral wall of the columnar passage 216 of the exhaust port 214 has a smooth curved enlarged portion F that expands radially and outward. The curved enlarged portion F further includes a concave portion 218 whose curvature is intentionally larger than other portions so as to form a circulation flow on the proximal end side of the curved enlarged portion F. When flowing to 218, a circulation flow is first formed in the recess 218 to prevent subsequent airflow from directly contacting the frame wall of the fan frame structure 21. Therefore, the airflow located in the vicinity of the recess 218 can provide the function of an air cushion, and the subsequent airflow does not directly contact the frame wall of the fan frame structure 21. Therefore, the friction between the original gas and the solid is changed to the friction between the gas and the gas, and noise can be greatly reduced. Moreover, since the recessed part 218 of the curved enlarged portion F further provides a sufficient space for the airflow, the airflow can be stabilized. In addition, in the present invention, the columnar passage 216 on the exhaust port 214 side is compared with the conventional fan frame 11 (FIG. 1E) that increases the outflow area of the air flow by forming the recess E when the air flow is discharged from the exhaust port 214. Since the inner peripheral wall has a smooth curved enlarged portion F that expands in the radial direction and outward, the airflow can be further concentrated and discharged.

The curved enlarged portion F is bilaterally symmetric or vertically symmetrical with respect to the axis of the columnar passage 216 (that is, another smooth curve that expands radially and outward also on the inner peripheral wall of the columnar passage 216 of the intake port 212). It has an enlarged part). Further, the length of the impeller 22 is increased along the shape of the smoothly-curved enlarged portion F that expands radially and outwardly on the inner peripheral wall of the fan frame structure 21. Can be adapted to the fan frame structure 21. Preferably, the leading end of the curved enlarged portion F of the exhaust port 214 has a lead angle 219a (FIG. 3A) in which the inner peripheral wall section changes into a curved line, and the inner peripheral wall section has a linear shape in order to discharge airflow more smoothly. Chamfered portions such as a changing inclination angle, a lead inclination angle in which the inner peripheral wall section changes in a curved shape and a straight line, and an arc angle in which the inner peripheral wall section changes in an arc shape are formed.

Further, the inner peripheral wall of the fan frame structure 21 on the side of the air inlet 212 can also be formed with an inclination angle 219b (FIG. 2B), a lead angle, a lead slope angle, an arc angle, and the like. Can also be increased. Alternatively, the inner peripheral wall of the columnar passage 216 of the fan frame structure 21 on the intake port 212 side described above further expands radially and outwardly symmetrically about the axis of the columnar passage 216, or the fan frame structure 21 Projecting outward, can be expanded radially and outwardly in a circular or elliptical shape.

In addition to the above, the curved enlarged portion F protrudes outward from the fan frame structure 21 around the axis of the columnar passage 216 and expands radially and outwardly according to the needs of the user. Alternatively, the discharge area can be further expanded.

Referring to FIG. 3B, there is shown a schematic diagram of another fan frame structure according to an embodiment of the present invention. Here, in addition to providing the above-mentioned curved enlarged portion F and the lead angles of the intake port 212 and the exhaust port 214, the motor base 26 is inclined in the radial direction in order to increase the air intake or exhaust area. Side 262. Further, the side portion 262 inclined in the radial direction has a flat surface or a curved surface.

In actual application, the heat dissipation device 2 of the present proposal can be arranged in a system frame 3 provided with a plurality of electronic components to form a heat dissipation system 5. FIG. 4 shows a schematic view in which the system frame 3 provided with electronic components and the heat dissipation device of the present invention are arranged. In the system frame 3, a heat source that generates heat or an electronic component is mounted on the circuit board 4. The heat radiating device 2 is provided at an appropriate position, and provides cold air generated by the operation of the heat radiating device 2 to a heat source or an electronic component. Therefore, the heat generated by the electronic component can be effectively dissipated and the electronic component can be prevented from being damaged by the high temperature.

Referring to FIGS. 5A and 5B together, FIG. 5A is a result of sound waves obtained by performing an acoustic test on a conventional fan, and FIG. 5B is a sound wave obtained by performing an acoustic test on the fan of the present invention. Is the result of Both the conventional fan and the fan of the present invention used a fan having a diameter of about 8 cm, and the rotational speed was 5700 rpm. As can be seen by comparing FIG. 5A and FIG. 5B, the conventional fan generates obvious noise at 665 Hz, and the fan of the present invention is improved there.

Referring to FIGS. 6A and 6B together, FIG. 6A is a result of sound volume obtained by performing an acoustic test on a conventional fan, and FIG. 6B is a sound volume obtained by performing an acoustic test on the fan of the present invention. Is the result of Both the conventional fan and the fan of the present invention used a fan having a diameter of about 8 cm, and the rotational speed was 5700 rpm. As seen in FIG. 6A, the noise level generated by the conventional fan at a rotational speed of 5700 rpm is 49.6 dB. As seen in FIG. 6B, the noise level generated by the fan of the present invention at the same rotational speed is 46.7 dB. Therefore, the fan using the present invention provides a reduced noise characteristic compared to the conventional fan.

Referring to FIG. 7, a characteristic comparison between the conventional fan and the fan of the present invention is shown here. Both the conventional fan and the fan of the present invention used a fan having a diameter of about 8 cm, and the rotational speed was 5700 rpm. As seen in the figure, the fan using the present invention has a higher wind pressure and air volume than the conventional fan. With the same air volume of about 40 CFM, the conventional fan reaches a wind pressure of about 7.9 mmH ₂ O, but the fan of the present invention can reach a wind pressure of about 12 mmH ₂ O, increasing the wind pressure by about 63%. Is done. In addition, when the air pressure is about 10 mmH ₂ O, the conventional fan reaches an air volume of about 28.8 CFM, but the fan of the present invention can reach an air volume of about 45 CFM, and the air volume is increased by about 56%. The Therefore, when the fan of the present invention is used, the wind pressure and the air volume can be effectively increased, and the effect of rectification can be achieved.

As described above, the heat dissipating fan, the fan frame structure, and the heat dissipating system of the present invention have the curved enlarged portion F, thereby reducing noise caused by friction between the air flow and the frame wall, and stabilizing and concentrating the air flow. The fan performance can be improved. Further, the inner peripheral wall of the fan frame structure 21 is expanded outwardly without affecting other heat dissipating parts installed on the fan from the beginning, and the area of the intake and exhaust air is increased, and the airflow is concentrated. As a result, the heat dissipation performance of the fan can be improved. Further, when assembling the fan or the fan frame structure 21 in the system or other heat radiating component, it is not necessary to change the arrangement of the system or the heat radiating component.

The preferred embodiment of the present invention has been described above, but this does not limit the present invention, and a few modifications and similar modifications that can be made by those skilled in the art without departing from the spirit and scope of the present invention. It is possible to add these devices. Accordingly, the scope of the protection claimed by the present invention is based on the scope of the claims.

The schematic of the conventional fan is represented. 1B is a cross-sectional view taken along the line A-A ′ of FIG. 1 is a schematic diagram showing an improved fan frame of a conventional fan. 1 is a schematic diagram showing an improved fan frame of a conventional fan. 1 is a schematic diagram showing an improved fan frame of a conventional fan. 1 represents a schematic view of a fan according to an embodiment of the invention. 2B is a cross-sectional view taken along line B-B ′ of FIG. It is the schematic of the curved expansion part F in FIG. 2B, and represents the direction of airflow. FIG. 5 shows a cross-sectional view of another fan frame structure according to an embodiment of the present invention. The schematic which arrange | positioned the system frame provided with the electronic component and the thermal radiation apparatus of this invention is represented. Fig. 4 shows a sound wave comparison between a conventional fan and the fan of the present invention. Fig. 4 shows a sound wave comparison between a conventional fan and the fan of the present invention. The volume comparison of the conventional fan and the fan of this invention is represented. The volume comparison of the conventional fan and the fan of this invention is represented. The characteristic comparison of the conventional fan and the fan of this invention is represented.

Explanation of symbols

1, 2 Fan 11, 21 Fan frame structure (outer frame)
112, 212 Intake port 114, 214 Exhaust port 116, 216 Columnar passage 12, 22 Impeller 13, 23 Motor 14, 24 Screw hole 218 Recess 219a Lead angle 219b Inclination angle 26 Motor base 262 Side 3 System frame 4 Circuit board 5 Heat dissipation System C Inclination angle D Lead angle E Concave F Curved enlarged part

Claims (10)

Including a columnar passage for guiding airflow from one opening to the other,
An inner peripheral wall of the columnar passage on the side of at least one of the openings includes an outer frame having a smooth curved enlarged portion that radially and outwardly expands, and the curved enlarged portion has a subsequent air flow. A fan frame structure for a heat dissipating device, further comprising a recess for forming a circulating flow in the air flow in order to prevent direct contact with the frame wall of the outer frame . The opening includes an intake port and an exhaust port, and the columnar passage guides airflow from the intake port to the exhaust port, and an inner peripheral wall of the columnar passage on the exhaust port side is in a radial direction. 2. The fan frame structure according to claim 1, wherein the fan frame structure has the curved enlarged portion that expands outward. An impeller, and a fan frame structure that houses the impeller,
The fan frame structure includes a columnar passage that guides an airflow from one opening to the other opening, and an inner peripheral wall of the columnar passage on the side of at least one of the openings is a smooth and radially expanding outer surface. An outer frame having a curved enlarged portion, and the curved enlarged portion further includes a recess for forming a circulating flow in the airflow in order to prevent a subsequent airflow from directly contacting the frame wall of the outer frame. Features a heat dissipation device. The opening includes an intake port and an exhaust port, and the columnar passage guides airflow from the intake port to the exhaust port, and an inner peripheral wall of the columnar passage on the exhaust port side is in a radial direction. The heat radiating device according to claim 3 , wherein the heat radiating device has the smoothly curved enlarged portion that expands outward. The heat dissipation device according to claim 3 , wherein a length of the impeller rotor blades increases along a radial direction of the curved enlarged portion. The heat radiating device according to claim 3 , comprising an axial flow fan. The motor base further includes a motor base provided in the fan frame structure, and the impeller is provided in the motor base, and the motor base has a radially inclined side portion in order to increase an airflow passage area. Item 4. The heat dissipation device according to Item 3 . The heat dissipation device according to claim 7 , wherein the side portion has a flat surface or a curved surface. System frame,
At least one electronic component provided in the system frame;
A heat dissipating device that is provided in the system frame and dissipates heat generated by the operation of at least one of the electronic components;
The heat dissipation device includes an impeller and a fan frame structure that accommodates the impeller, and the fan frame structure includes a columnar passage that guides airflow from one opening to the other opening, and is located on the side of at least one of the openings. The inner peripheral wall of the columnar passage includes an outer frame having a smooth curved enlarged portion that expands radially and outward, and the curved enlarged portion directly contacts the frame wall of the outer frame. In order to prevent this, the heat dissipation system further includes a recess for forming a circulation flow in the airflow . The opening includes an intake port and an exhaust port, and the columnar passage guides airflow from the intake port to the exhaust port, and an inner peripheral wall of the columnar passage on the exhaust port side is in a radial direction. The heat dissipation system according to claim 9 , further comprising the curved enlarged portion that expands outward.

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