JP2005235946A - Electronic device and axial fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thinned electronic device, and to provide an axial fan capable of cooling insides of the thinned electronic device and an electric device. <P>SOLUTION: The electronic device has the axial fan 1 slantly provided on a flat plane C3 inside a thin case C having a pair of flat planes C3 and C4 together with a heating element C1. The gradient direction of the axial fan 1 is such that a discharged air stream flows toward the heating element C1 by the flat plane C3. The axial fan 1 is designed to suppress a radially outward airflow by a housing 4 surrounding a rotor, and has a minimizing part where the intensity of the suppression is the minimum on the side facing the heating element C1 in the housing 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to various electronic devices such as office automation equipment and home appliances that require cooling of internal electronic components, and a cooling fan provided in the electronic devices. In particular, the present invention relates to a fan that takes in air from above a housing of a fan housing or an apparatus and exhausts air from a side surface.

  When various electronic devices such as OA devices and home appliances are mounted with components that generate a large amount of heat, or various components including heat generating components are densely incorporated into the device and the internal gap is small, It may interfere with a predetermined operation when the temperature inside the apparatus rises. For this reason, a cooling fan is usually mounted in the apparatus in order to suppress a temperature rise. The fan is arranged in the vicinity of the heat generation source, or is combined with a radiator that is thermally connected to the heat generation source to form a cooling device, and further the air inside the device is exhausted to the outside. It arrange | positions in the vicinity of the exhaust port provided in the housing | casing.

  A general fan used for such OA equipment and home appliances is formed such that a plurality of blades discharges air sucked from one end side in the axial direction of the rotating shaft to the other end side in the axial direction. And a housing that accommodates the rotor blade and forms a flow path of an air flow induced by the rotor blade by a cylindrical peripheral wall that surrounds the rotor blade.

  In recent years, various electronic devices such as the above-described OA equipment and home appliances tend to be highly functional and thin, and thus the internal space of the device tends to be narrowed even though the amount of heat generation is further increased. is there. Therefore, it is required that the fan mounted on the fan can be arranged in a narrow casing and that a sufficient air volume can be obtained.

  In order to meet such demands, a thin centrifugal fan has been developed (Patent Document 1). However, although a centrifugal fan generally has a high static pressure, it has a small air volume, so it is not always effective when the amount of heat to be cooled is large.

  Also, a method has been devised in which an axial fan having a relatively large diameter is mounted obliquely on a thin casing (Patent Document 2). In the example of Patent Document 2, since the exhaust flow collides with the bottom surface directly below the fan and flows to the cooled object side, the wind loss increases at the time of the collision, and sufficient air is supplied to the cooled object. Cannot be sent.

Japanese Patent Laid-Open No. 2003-023128 JP-A-10-257709

  An object of the present invention is to provide a thin electronic device and to provide an axial fan capable of cooling the inside of the thin electronic device and electric device.

  In order to solve the above-mentioned problem, the invention of claim 1 described in the present application includes, inside the housing, between one flat surface, the other flat surface facing one flat surface, and the facing flat surface. It has an axial fan that is installed and has an air blowing capability toward one end of the rotating shaft, and a component to be cooled adjacent to the axial fan. The axial fan is composed of a rotor blade and a housing surrounding the rotor blade. The axial length is smaller than the outer diameter of the housing, and the rotor shaft is arranged so that one end side of the rotor shaft approaches the part to be cooled. It is installed at an angle with respect to the normal of the flat surface. The distance between one flat surface and the other flat surface is approximately half or less of the outer diameter of the housing, and the housing is composed of a peripheral wall that suppresses the air generated by the rotor blades from going radially outward. In addition, an electronic device is provided that has a minimum portion in which a suppression strength is a minimum in a specific direction as viewed from the center of a rotor blade.

  In order to solve the above problems, the invention of claim 2 described in the present application has a local maximum adjacent to the local minimum, and the local maximum is caused by the air generated by the rotor blades outward in the radial direction. It is configured to strongly suppress this. And the front-end | tip of a rotary blade provides the electronic device comprised so that it might pass through the maximum part immediately after passing through the vicinity of the minimum part.

  In order to solve the above problems, the invention according to claim 3 described in the present application is characterized in that one flat surface has an intake port that opens to the outside of the housing, and the other end of the rotating shaft faces the intake port. Provide an installed electronic device.

  In order to solve the above-mentioned problems, the invention according to claim 4 described in the present application is such that, in the housing, the peripheral edge on the side from which air is discharged has a bent portion on the substantially opposite side to the rotating shaft with respect to the component to be cooled. In the bent portion, the peripheral edge has a shape in which there is one flat surface that can be contacted with almost no gap. One plane provides an electronic device in which a side of the both surfaces that does not face the housing is inclined in a direction away from the member to be cooled, and is adjacent to or in contact with the other surface.

  In order to solve the above-mentioned problem, the invention of claim 5 described in the present application is that the housing has an exhaust-side enlarged portion that expands as the inner diameter increases from the rotor blade toward the one end side of the rotary shaft, and the inner diameter rotates. An expansion portion on the intake side that expands away from the blade toward the other end side of the rotary shaft, and the rotary blade is installed between the expansion portion on the exhaust side and the expansion portion on the intake side. The fan is surrounded by a member that resists air flow along one or the other flat surface, and no electronic device is provided between the axial fan and the component to be cooled. To do.

  In order to solve the above-mentioned problems, the invention of claim 6 described in the present application provides an electronic apparatus in which the surrounding member is constituted by a continuous wall surface and blocks air flow.

  In order to solve the above-described problems, the invention of claim 7 described in the present application provides an electronic device in which the surrounding member is constituted by a continuous wall surface and blocks air flow.

  In order to solve the above-mentioned problems, the invention of claim 8 described in the present application provides an electronic device in which the surrounding member is composed of a plurality of members including electronic components.

  In order to solve the above-mentioned problems, the invention of claim 9 described in the present application provides an electronic device in which a heat sink is attached to a component to be cooled.

  In order to solve the above problems, the invention of claim 10 described in the present application is an electronic device in which an axial fan previously manufactured as a separate part is installed in a predetermined arrangement in a casing. An electronic device is provided.

  In order to solve the above-described problems, the invention of claim 11 described in the present application is composed of a rotor blade and a housing surrounding the rotor blade, and the housing is configured such that air generated by the rotor blade is directed radially outward. It consists of the peripheral wall to suppress. In addition, an axial fan is provided that has a minimum portion that shows a minimum suppression strength in a specific direction as viewed from the center of the rotor blade, and the minimum portion is a portion where the peripheral wall expands radially outward. To do.

  In order to solve the above-mentioned problem, the invention of claim 12 described in the present application has a local maximum adjacent to the local minimum, and the local maximum is the air generated by the rotor blades going outward in the radial direction. It is configured to strongly suppress this. And the front-end | tip of a rotary blade provides the axial flow fan comprised so that it might pass through the maximum part immediately after passing through the vicinity of the minimum part.

  In order to solve the above-mentioned problem, the invention of claim 13 described in the present application is such that, in the housing, the peripheral edge on the exhaust side has a bent portion on the substantially opposite side of the rotation axis with respect to the minimum portion, The peripheral edge has a shape in which there is one flat surface that can be contacted with almost no gap. One flat surface provides an axial fan in which the side of the both surfaces not facing the housing is inclined in a direction away from the member to be cooled.

  In order to solve the above-mentioned problems, the invention of claim 14 described in the present application provides an axial fan having a reflecting plate installed at a location coinciding with one plane.

  In order to solve the above-mentioned problem, the invention of claim 15 described in the present application is that the housing has an exhaust-side enlarged portion whose inner diameter increases from the rotor blade toward the one end side of the rotary shaft, and an inner diameter is rotated. An expansion portion on the intake side that expands away from the blade toward the other end side of the rotary shaft, and the rotary blade is installed between the expansion portion on the exhaust side and the expansion portion on the intake side. Provide fans.

  According to the electronic device of the first aspect of the present invention, an air flow having a sufficient air volume can be generated in the thin casing, and the internal electronic components can be cooled.

  In the present invention, the axial fan is not only installed in a low-height space while being inclined toward the component to be cooled, but the shape of the housing is devised so that the air is partially directed radially outward. A minimal part that easily flows out is provided facing the part to be cooled.

  Since the wind of the axial fan blocked by the bottom of the space can go to the part to be cooled through this minimum part, the wind can be sent efficiently and the part to be cooled can be cooled efficiently. Is done.

  According to another aspect of the present invention, a local maximum portion is provided adjacent to the local minimum portion to block the flow of wind. In this way, you can concentrate the wind. Furthermore, the minimum part is located at the position facing the cooling component, and the maximum part is located behind the rotating blade adjacent to it, so that the portion where the tip of the rotating blade moves away from the part to be cooled is It is possible to cover the parts to be cooled. That is, since the flow in the direction away from the component to be cooled can be suppressed, the static pressure is increased and the component to be cooled is efficiently cooled.

  In the electronic device according to claim 3, since the intake port is provided in the housing and the intake side of the axial fan is disposed close to the housing, the intake of air is facilitated, and the axial flow having a relatively low static pressure is provided. Even a fan can get enough airflow.

  In the electronic device according to the fourth aspect, the side close to the flat surface inside the electronic device inside the housing of the axial fan has a shape that is obliquely cut, so that it is larger in the space of the same height. It becomes possible to install an axial fan having a diameter, increase the air volume, and cool the components in the electronic device more strongly.

  In the electronic device according to the fifth aspect, by providing the enlarged portions on the intake side and the exhaust side of the housing of the axial fan, the resistance of the intake and exhaust is reduced and the air volume is increased. These reductions in resistance are particularly useful under conditions where air flow resistance tends to increase as in the configuration of the present invention.

  In the electronic device according to the sixth aspect, wind leakage that cannot be sufficiently suppressed by the housing can be reduced, so that the cooling of the member to be cooled is further efficient.

  In the electronic device according to the seventh aspect, the intake direction can be limited to the opening only by covering the periphery of the axial fan with a wall that does not allow air to pass therethrough. Mainly, only the air outside the casing can be blown to the object to be cooled.

  In the electronic device according to the eighth aspect of the present invention, the electronic component is surrounded by the electronic component so that the electronic component is disposed on the exhaust side by the flow of air sucked from the periphery toward the axial fan. It can be cooled at the same time as the parts.

  In the electronic device according to the ninth aspect, the component to be cooled can be cooled more efficiently by mounting the heat sink on the component to be cooled.

  According to another aspect of the electronic device of the present invention, an axial fan integrated with the housing is separately prepared and attached to the inside of a housing having an air inlet on the outer surface. By doing so, the electronic device of the present invention can be assembled more efficiently.

  According to the axial fan of the eleventh aspect, the enlarged portion on the exhaust side has a portion further enlarged in the width direction. By separately manufacturing the axial fan and attaching it to the housing, the electronic device of the present invention can be efficiently assembled, and the component to be cooled can be efficiently cooled.

  According to the axial flow fan of the twelfth aspect, since the exhaust direction cannot be concentrated as much as possible, and the portion where the tip of the rotor blade moves away from the exhaust direction can be covered, the static pressure is increased.

  According to the axial flow fan of the thirteenth aspect, it is possible to suppress the height required for installation on a flat surface to a lower level.

  According to the axial flow fan of the fourteenth aspect, it is possible to obtain a fan that can be blown by deflecting the flow of the sucked air by approximately 90 degrees, although it is an axial flow fan.

  According to the axial flow fan of the fifteenth aspect, the resistance of the intake air and the exhaust gas is reduced and the air volume is increased.

  An embodiment of an electronic device and an axial fan according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part in a state where the axial fan 1 is mounted on a notebook personal computer, and FIG. 2 is a plan view of FIG. 1 viewed from the intake port side of the axial fan 1. 3 is a perspective view of the axial fan of FIG. 1 as viewed from the intake port side, and FIG. 4 is a perspective view of the axial fan of FIG. 1 as viewed from the exhaust port side. 5 is a plan view of FIG. 1 viewed from the exhaust port side of the axial fan, and FIG. 6 is a side view of FIG. 5 viewed from the arrow A in FIG.

  As shown in FIGS. 1 and 2, the axial fan 1 is disposed in an inclined manner at an angle with respect to the perpendicular P on the bottom surface of the casing C in the casing C of the notebook computer. It is juxtaposed with a heat sink C2 that is thermally connected to the heating element C1 in the direction. The inclination direction of the axial fan 1 is a direction in which one end side of the rotating shaft approaches the heat sink C2. The housing C includes a pair of flat surfaces C3 and C4. The flat surface C3 is located on one end side of the rotating shaft of the axial fan 1, and the flat surface C4 is located on the other end side. The flat surface C4 is provided with an intake port C5 on the other end side of the rotating shaft of the axial fan 1. Since the casing C is small and thin, and various electronic components C6 and the like are densely arranged in the casing C, the axial fan 1 is surrounded by the various electronic components C6, and the lateral air Is arranged in a space with high resistance, but it is configured such that a predetermined amount of air can be sucked by combining the upper intake port C5 and the lateral space respectively. Since the distance H1 between the pair of flat surfaces C3 and C4 is approximately half or less of the outer diameter R of the axial fan 1, it can be seen that the axial fan 1 is disposed in the thinned case sink space. The flat surfaces C3 and C4 are not limited to the case where the casing C is configured by a metal or resin plate-like member, and may be formed using a circuit board mounted in the casing C.

  As shown in FIGS. 3 and 4, the detailed structure of the axial fan 1 includes a rotor blade 2 provided with an electric motor inside, and a housing 4 that supports the rotor blade 2. The rotary blade 2 is provided with a plurality of blades, and has a blowing ability to discharge air sucked from the other end side of the rotary shaft of the electric motor toward the one end side.

  The housing 4 has a flat shape because the axial length H2 is smaller than the outer diameter R as shown in FIG. The housing 4 has a cylindrical peripheral wall 41 surrounding the periphery of the rotary blade 2, and an air flow induced by the rotary blade 2 flows from the opening on the other end side to the opening on the one end side in the peripheral wall ( That is, the peripheral wall 41 suppresses air from being dissipated outward in the radial direction. Therefore, in the peripheral wall 41, the opening on the other end side functions as the intake port 42 and the one end side functions as the exhaust port 43. On the side of the air inlet 42, a circular portion 44 that supports the electric motor is supported by three ribs 45a, 45b, and 45c that are connected to three portions in the circumferential direction of the peripheral wall 41. A lead wire (not shown) from the electric motor is housed and held in a groove 49 provided in a tapered surface 43a, which will be described later, and pulled out to the outside.

  As shown in FIG. 3, the peripheral wall 41 is formed as an intake-side tapered surface 42a (corresponding to the intake-side enlarged portion) that expands as the inner diameter of the end portion on the intake port 42 side increases toward the other end side direction. However, flat walls 41a and 41b are formed at two opposite positions in the middle. A pair of attachment portions 47 for attaching the axial fan 1 to the casing C are provided at both ends of the flat wall 41a on the outer peripheral side of the tapered surface 42a.

  As shown in FIG. 4, the inner diameter of the end portion of the peripheral wall 41 on the exhaust port 43 side is also formed as an exhaust-side tapered surface 43a (corresponding to the exhaust-side enlarged portion) that increases as it moves away from the one end side. However, the gradient of the tapered surface 43a varies along the circumferential direction. In addition, similar flat walls 41a and 41b are formed in portions corresponding to the flat walls 41a and 41b on a part of the tapered surface 43a. As shown in FIGS. 4 and 5, the tapered surface 43a has the maximum gradient at both ends of the flat wall 41a, the gradient gradually decreases from both ends toward the flat wall 41b, and is minimum at the center of the flat wall 41b. Yes. That is, the tapered surface 43a is a gentle surface from both ends of the lower half taper surface 43a divided by the straight line L in the horizontal direction passing through the rotation axis in FIG. 5 and becomes deepest at the upper center of the flat wall 41b. A recess 41c is formed. Therefore, the intensity of suppression of air going radially outward in the concave portion 41c where the gradient of the tapered surface 43a is minimum is minimized (that is, the concave portion 41c corresponds to the minimal portion), and the radius around this vicinity is the center. The air flow outside the direction is easy to flow. On the contrary, the flat wall 41a of the tapered surface 43a and the vicinity of both ends thereof have a steep gradient, so that the suppression strength is maximized. In addition, a pair of attachment part 48 is provided in the edge part of the taper surface 43a at the both ends of the flat wall 41b.

  Further, the housing 4 has a bent portion that is in contact with the flat surface C3 so that the rotation axis has an angle with respect to the perpendicular P on the substantially opposite side of the rotation axis in the peripheral wall 41, rib 45c, and circular portion 44 on the exhaust port 43 side. 43b is formed. As a result, the axial fan 1 is inclined with respect to the flat surface C3, and a part of the exhaust port 43 (near the bent portion 43b) is blocked by the flat surface C3.

  The axial fan 1 draws air in the axial direction from the intake port 42 and exhausts it in the axial direction from the exhaust port 43 when the rotary blade 2 rotates in the direction of the arrow Y1 in FIGS. Flows along the tapered surface 43a toward the one end side of the rotating shaft while forming a spiral flow around the rotating shaft, which is a combination of the rotational velocity component and the axial velocity component. Then, this exhaust flow collides with the flat surface C3 from an oblique direction and is deflected and flows toward the heat sink C2.

  At this time, the air flow flowing on the left side of the exhaust port 43 in FIG. 5 has a gentle slope of the tapered surface 43a along the flow direction, so that the strength of suppression of the air flow outward in the radial direction gradually decreases and the radius It is also discharged out of the direction. In particular, since the strength of the suppression is minimal within the recess 41c, air easily flows radially outward in this region. On the other hand, the airflow flowing on the right side of FIG. 5 of the discharge port 43 flows closer to the axial direction because the inclination of the tapered surface 43a becomes tight along the flow direction, and the suppression strength is maximized (axial direction). The air flow is due to the flat surface C3). Further, since the exhaust port 43 is partially closed by the flat surface C3, the closed side has a higher internal pressure than the open side, and the flow toward the heat sink C2 is also promoted by this internal pressure difference. Thus, since the axial fan 1 is configured to exhaust air not only in the axial direction but also in a specific range of radial directions, there is little windage loss when the exhaust flow is deflected to the heat sink C2 side by the flat surface C3. Flows smoothly.

  Therefore, even in the case where the objects to be cooled are juxtaposed with the axial flow fan (the relationship where the objects to be cooled are positioned in a direction substantially perpendicular to the intake direction), As shown in FIG. 4, the housing 4 is arranged so that the recess 41c faces the heat sink C2, and the exhaust flow smoothly flows toward the cooled body, so that the cooled body can be efficiently cooled. Further, since the intake and exhaust air is supplied from the side of the electronic component C6 surrounding the axial flow fan 1, an air flow is generated in this region, and the electronic component C6 is also cooled.

  In addition, since the concave portion 41c serving as the radial outlet is formed with a gentle curved surface by the tapered surface 43a, the suppression of the flow outward in the radial direction is gradually relieved, so that there is little wind loss and smooth air. It is possible to flow from the recess 41c to the outside, and noise generation is small.

  Further, the rib 45a is connected to the left side of the recess 41a in FIGS. 5 and 6 so that the exhaust flow from the recess 41a can be rectified. The exhaust flow has a large air volume because the left side of the concave portion 41a is discharged as it is along the rotation direction. On the contrary, the right side of the concave portion 41a is discharged in the direction opposite to the rotational direction, and therefore has a smaller air volume than the left side. If unevenness occurs in such air volume, efficient cooling may not be possible. However, by positioning the rib 45a in a part where the air volume is large as in this example, the rib 45a performs a rectifying action to alleviate the unevenness. There is work. Note that the rib 45a may be provided at an arbitrary position when the exhaust flow unevenness does not hinder the blowing or cooling.

  Further, in the present example, the air flowing in the axial direction of the exhaust flow of the axial fan 1 collides with the flat surface C3 of the casing C at an angle, so that the air flow flows toward the heat sink C2 and the heat sink C2 is cooled. However, if the flat surface C3 of FIG. 1 is not directly under the exhaust port 43 due to the structure of the casing C, a dedicated flat plate may be installed or the exhaust port 43 may be connected as shown in FIG. You may make it provide the reflecting plate 50 in the housing 4 so that a part may be obstruct | occluded.

  By the way, the axial fan 1 includes an end surface of the flat wall 41b of the housing 4 on the inlet 41 side, an end surface of the peripheral wall 41 continuous therewith, and a rib 45c (corresponding to a bent portion) as shown in FIG. An axial fan having a larger outer diameter size, even if the casing C is made thinner by making it a shape that is cut in a range in which the rotor blades 2 do not interfere so as to be parallel to the flat surface C3 of C. 1 or the casing C can be made thinner without changing the outer diameter size of the axial fan 1. Similarly, the end surface of the flat wall 41a on the exhaust port 43 side and the end surface of the peripheral wall 41 continuous therewith are cut so as to be parallel to the flat surface C4 of the housing C as shown in FIG. By doing so, the same effect can be obtained in the thinned casing C.

  Further, like the axial fan 1 'shown in FIG. 8, the housing 4' has the same intake / exhaust relationship with the axial fan 1, so that the periphery of the intake / exhaust port can be installed parallel to the horizontal installation surface. The rotor blade 2 'may be configured to have an angle with respect to the perpendicular P of the installation surface. . Since the axial fan 1 'can be mounted in parallel to any of the flat surfaces C3 and 4 as shown in FIG. 1, the configuration shown in FIG. 1 can be easily realized. In this case, the housing 4 ′ of the axial fan 1 ′ can be configured as a single member by deforming the housing 4, or can be configured as a separate part from the housing 4.

  Further, when the object to be cooled is smaller than the outer diameter size of the axial fan 1, when it is desired to intensively cool the exhaust fan radially outward of the axial fan 1, or when it is desired to set a higher static pressure, 5 to strengthen the slope of the taper surface 43a located on the right side of the rib 45a or extend the flat wall 41b to increase the strength of restraining the air flow radially outward at this part, By adopting a configuration in which the maximum portion is disposed adjacent to the minimum portion, it is preferable that the air flow be concentrated on the left side of the rib 45a. Further, as shown in FIG. 9, the same configuration has a tapered surface 43a on the exhaust side as a starting point where the gradient is maximum (maximum part), where the gradient gradually decreases in the rotation direction and the gradient becomes minimum. It can also be realized by configuring the (minimum portion) as a scroll shape that is the end point.

  Further, in this example, the flat walls 41a and 41b are formed at both the intake and exhaust ports 42 and 43. However, the tapered surfaces 42a and 43a are continuously formed so that only one or none is provided. It may be.

  As mentioned above, although one Embodiment of this invention was described, the scope of the present invention is not limited to this, and can be changed in the range which does not deviate from the meaning.

1 is a cross-sectional view showing an embodiment of an electronic device and an axial fan of the present invention. The top view which looked at FIG. 1 from the inlet-port side of the axial flow fan. The perspective view which looked at the axial fan of FIG. 1 from the inlet port side. The perspective view which looked at the axial flow fan of FIG. 1 from the exhaust port side. The top view which looked at the principal part of FIG. 1 from the exhaust port side of the axial flow fan. The side view which looked at the axial flow fan of FIG. 1 from the side. The top view which shows the modification of the axial fan of this invention. Sectional drawing which shows another modification of the axial fan of this invention. The top view which shows another modification of the axial fan of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1 'Axial flow fan 2 Rotor blade 4, 4' Housing 41 Perimeter wall 42 Intake port 43 Exhaust port 42a, 43a Tapered surface C Case C1 Heat generating body C2 Heat sink C3, C4 Flat surface C5 Inlet port

Claims (15)

An electronic device in which an electronic component is housed in a housing,
Inside the housing,
One flat surface,
The other flat surface opposite to the one flat surface;
An axial fan that is installed between the opposed flat surfaces and has a blowing ability toward one end of the rotating shaft;
A component to be cooled adjacent to the axial fan;
Have
The axial fan is
A rotor and a housing surrounding the rotor;
The axial length is smaller than the outer diameter of the housing. The rotary shaft is installed at an angle with respect to the normal of the one flat surface so that the one end side of the rotary shaft approaches the part to be cooled. Is,
The distance between the one flat surface and the other flat surface is approximately half or less of the housing outer diameter,
The housing is
It consists of a peripheral wall that suppresses the air generated by the rotor blades from going radially outward, and
In a specific direction as seen from the center of the rotor blade, the intensity of the suppression has a minimum portion showing a minimum,
Electronic equipment. A local maximum is present adjacent to the local minimum,
The local maximum portion is configured to strongly suppress the air generated by the rotor blades from going radially outward, and
The tip of the rotor blade is configured to pass through the local maximum immediately after passing near the local minimum.
The electronic device according to claim 1. The one flat surface has an air inlet opening outside the housing; and
The other end side of the rotating shaft is installed facing the intake port,
The electronic device according to claim 1. In the housing, the peripheral edge on the side from which air is discharged has a bent portion on a substantially opposite side of the rotating shaft with respect to the component to be cooled,
In the bent portion, the peripheral edge has a shape in which there is one flat surface that can be contacted with almost no gap,
The one plane is
Of the both sides, the side not facing the housing is inclined in a direction away from the member to be cooled,
In proximity to or in contact with the other surface,
The electronic device according to claim 1. The housing is
An enlarged portion on the exhaust side, the inner diameter of which increases from the rotary blade toward the one end side of the rotary shaft;
An enlarged portion on the intake side, the inner diameter of which expands from the rotary blade toward the other end side of the rotary shaft,
The rotor blade is installed between the exhaust-side enlarged portion and the intake-side enlarged portion,
The electronic device according to claim 1. The axial fan is surrounded by a member that provides resistance to air flow along the one or the other flat surface,
The member is not disposed between the axial fan and the component to be cooled.
The electronic device according to claim 1. The surrounding member is composed of a continuous wall surface and blocks air flow.
The electronic device according to claim 6. The surrounding member is composed of a plurality of members including electronic components.
The electronic device according to claim 6. A heat sink is attached to the component to be cooled,
The electronic device according to claim 1. The electronic device is formed by installing the axial fan, which has been manufactured as a separate part in advance, in a predetermined arrangement inside the housing.
The electronic device according to claim 1. A rotor and a housing surrounding the rotor;
The housing is
It consists of a peripheral wall that suppresses the air generated by the rotor blades from going radially outward, and
In a specific direction as seen from the center of the rotor blade, the intensity of the suppression has a minimum portion showing a minimum,
The minimum portion is composed of a portion where the peripheral wall expands radially outward.
An axial fan characterized by things. A local maximum is present adjacent to the local minimum,
The maximum portion is configured to strongly suppress the air generated by the rotor blades from going radially outward, and
The tip of the rotor blade is configured to pass through the local maximum immediately after passing near the local minimum.
The axial fan according to claim 11. In the housing, the peripheral edge on the exhaust side has a bent portion on a substantially opposite side of the rotation axis with respect to the minimum portion,
In the bent portion, the peripheral edge has a shape in which there is one flat surface that can be contacted with almost no gap,
The one plane is inclined in the direction away from the member to be cooled, the side of the both surfaces not facing the housing.
The axial fan according to claim 11 or 12, characterized in that: Having a reflector installed at a location coinciding with the one plane;
The axial fan according to claim 13, characterized in that: The housing is
An enlarged portion on the exhaust side, the inner diameter of which increases from the rotary blade toward the one end side of the rotary shaft;
An enlarged portion on the intake side, the inner diameter of which expands from the rotary blade toward the other end side of the rotary shaft,
The rotor blade is installed between the exhaust-side enlarged portion and the intake-side enlarged portion,
The axial fan according to claim 11 to 14.

Images