CN102966580A - Fan modules and server equipment - Google Patents

Abstract

A fan module (1) and server equipment (8) are provided that can achieve a balance between increased airflow and noise reduction when an axial flow fan (3) is mounted in the server equipment (8). The fan module (1) for taking in and discharging air includes a stator (2) located on an upstream side with respect to airflow and an axial flow fan (3) located on the downstream side. When the fan module is viewed from the rotational-axial direction of the axial flow fan (3), if a leading edge of a rotor vane (32) constituting part of the axial flow fan (3) passes a trailing edge of a stator vane (22) constituting part of the stator (2), a skew is formed in which the leading edge of the rotor vane (32) constantly intersects the leading edge of the stator vane (22) at a single point.

Description

Fan modules and server equipment

technical field

The present invention relates to a fan module and a server device, for example, relates to a fan module combined with an axial flow fan and a rectifying grille, and an information device installed with the fan module, that is, a server device.

Background technique

OA, IT equipment, and home appliances are equipped with cooling fans for cooling electronic components that generate heat. In recent years, the miniaturization and high performance of these home appliances, OA, and IT equipment have been advancing in the market. Along with this miniaturization and higher performance, the amount of heat generated from the electronic components tends to increase due to the increase in the density of the electronic components in the internal structure of the device.

To cope with the increase in the amount of heat generated from electronic components, a small axial flow fan that is small and easy to obtain air volume is generally used as a cooling fan. For small axial fans, in most cases, the designer installs a fan that matches the respective purpose from the general-purpose products sold by the fan supplier into the device.

Of course, the general purpose small axial fans are not tuned in every installation, so in most installations the fan does not perform as well as one would expect.

In particular, as shown in the information equipment represented by the server equipment in the data center, in the case of high-density installation of the bases inside the equipment, due to the turbulence of the air flowing into the fan and the narrowing of the flow path width, the The air volume of the fan is significantly reduced, and the noise is increased.

Therefore, in general-purpose small axial flow fans mounted on information equipment, attention has been paid to technologies capable of increasing the air volume and reducing noise during mounting.

For example, in Patent Document 1, it is described that a total of two axial flow fans, a first axial flow fan and a second axial flow fan, are arranged in series from the upstream side of the airflow with respect to the direction of the rotation axis of the fan. There is a rectification device in between. In addition, it is described that the rectifying device imparts a swirling flow opposite to the rotation direction to the second axial flow fan by deflecting the airflow flowing out from the first axial flow fan. As the effect, it is described that the static pressure characteristics of the two axial flow fans arranged in series are improved and the air volume is increased.

Patent Document 1: WO2008/062835

In the prior art as described above, the effect of increasing the air volume is obtained, but noise reduction is not mentioned on the other hand. Therefore, there is a problem of achieving both an increase in the air volume and a reduction in noise when the axial flow fan is installed. In addition, since it presupposes the serial arrangement of two axial flow fans, there is also a problem that it cannot be used in a form that is mounted on information equipment that does not conform to this.

Contents of the invention

An object of the present invention is to provide a fan module and a server device which can increase the air volume and reduce the noise of an axial fan when mounted on information devices.

In order to solve the above-mentioned problems, for example, the configuration described in the claims is employed. This application includes a number of methods to solve the above problems, but to give an example, a fan module is used to take in and discharge air, and it is characterized in that it has a rectifying grille and a device arranged on the upstream side with respect to the flow of air. In the axial flow fan on the downstream side, when the fan module is viewed from the rotation axis direction of the axial flow fan, the rear edge of the stator blade constituting the rectifying grille and the moving blade constituting the axial flow fan The leading edge of each has two intersection points with two concentric circles with different radii, and the straight line connecting the two intersection points on the trailing edge of the stator blades that will constitute the rectifying grille and the line that will constitute the axial flow fan A straight line connecting two intersection points on the leading edge of the moving blade, on one of the two concentric circles, and an intersection point on the trailing edge of the stator blade constituting the rectifying grid and constituting the shaft When an intersection point on the leading edge of the moving blade of the flow fan overlaps, on the other concentric circle of the two concentric circles, another intersection point on the trailing edge of the stator blade constituting the rectifying grid and Another point of intersection on the leading edges of the moving blades constituting the axial fan does not coincide.

Furthermore, it is characterized in that the inclination direction of the moving blade is opposite to the inclination direction of the stator blade.

Furthermore, it is characterized in that the stator blades are given reverse pre-rotation with respect to the rotor blades.

Furthermore, it is characterized in that the stator blades constituting the rectifying grid are warped in a U-shape.

Furthermore, it is characterized in that a rectification grille is arranged also on the downstream side of the axial flow fan.

Furthermore, it is characterized in that the position of the trailing edge of the stator vane constituting the rectifying grill disposed on the downstream side of the axial fan is a positive position with respect to the leading edge in the rotation direction of the axial fan.

Furthermore, it is characterized in that the space between adjacent stator blades constituting the rectifying grid is narrower than the width of a finger.

Furthermore, it is characterized in that the axial flow fan of any one of the fan modules described above is integrally formed with the rectifying grille.

Furthermore, it is characterized in that a plurality of fan modules described above are combined in series or in parallel.

Furthermore, it is characterized in that any one of the fan modules described above is mounted on server equipment.

Invention effect

According to the present invention, it is possible to provide a fan module capable of increasing the air volume and reducing the noise of the axial fan when it is installed in server equipment.

Attached to the lock

Fig. 1 is a fan module according to Embodiment 1 of the present invention.

Fig. 2 is a rectifying grille constituting the fan module shown in Fig. 1 .

FIG. 3 is an axial flow fan constituting the fan module shown in FIG. 1 .

Fig. 4 shows the inflow to the axial fan when the atmosphere is open.

Fig. 5 shows the inflow to the axial fan when it is installed on information equipment.

Fig. 6 is a comparison of the speed distribution of the inflow axial flow fan when the atmosphere is open and when it is installed.

Fig. 7 is a part of the fan module shown in Fig. 1 viewed from the rotation axis direction.

Fig. 8 is a graph showing the effect of the second embodiment of the present invention.

Fig. 9 is a cylindrical section of the fan module according to the third embodiment of the present invention.

Fig. 10 is a fan module according to Embodiment 4 of the present invention.

Fig. 11 is a rectification grille constituting the fan module shown in Fig. 10 .

Fig. 12 is a cylindrical section of the fan module according to the fourth embodiment of the present invention.

Fig. 13 is a fan module according to Embodiment 5 of the present invention.

Fig. 14 is a rectification grille constituting the fan module shown in Fig. 13 .

Fig. 15 is a schematic configuration diagram of a PC server device according to Embodiment 6 of the present invention.

Fig. 16 is a fan module according to Embodiment 7 of the present invention.

Fig. 17 is a graph showing the effect of the seventh embodiment of the present invention.

Fig. 18 is a fan module according to the eighth embodiment of the present invention.

Fig. 19 is a fan module according to Embodiment 9 of the present invention.

FIG. 20 is a schematic configuration diagram of a blade server (blade server) according to Embodiment 10 of the present invention.

Explanation of reference signs

1 fan module

2 rectifying grille

3 Axial fans

21, 31 Boss

22 Stator blades

23, 35 outer frame

32 moving blade

33 motor cover

34 pillars

Detailed ways

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, the schematic configuration of the fan module will be described with reference to FIGS. 1 to 3 . In addition, since the structure with the same code|symbol shown in each figure has the same function, description of these may be omitted in other figure. Figure 1 is the fan module. The fan module 1 is configured by serially arranging a rectifying grill 2 and an axial fan 3 sequentially from the upstream side of the air flow.

Figure 2 is a rectification grid. The rectifying grid 2 is composed of a boss 21 , a stator vane 22 extending from the boss and an outer frame 23 supporting the stator vane.

Figure 3 is an axial flow fan. The axial flow fan 3 comprises: a rotating boss 31 on which the motor is installed, a moving blade 32 extending from the boss, a motor cup (motor cup) 33 supporting the motor mounted on the boss, and a motor cover for supporting the motor. The column 34 of the barrel 33 and the outer frame 35 for supporting it.

Embodiment 1 will be described with reference to FIG. 4 , FIG. 5 , and FIG. 6 . Fig. 4 is a diagram illustrating a state of an inflow axial fan when the atmosphere is released. FIG. 5 is a diagram illustrating a state of an inflow axial fan when it is mounted on information equipment. Fig. 6 is a comparison diagram of the speed distribution of the inflow axial flow fan when the atmosphere is released and when it is installed.

In the cooling of various information devices, a blocker, such as a base, which disturbs the air flow, is generally arranged on the upstream side of the cooling fan. Noise is generated when the airflow disturbed by these barriers flows into the fan mounted on the information equipment. In addition, as shown in Fig. 4, the general-purpose small axial flow fan is assumed to be used under the condition of open atmosphere, so the inflow a1 to the axial flow fan is not only designed to come from the direction of the rotation axis, but also assumed to be from the direction perpendicular to the rotation axis. direction. On the other hand, since the axial flow fan at the time of installation has a flow path restricted, for example, as shown in FIG. 5, only the inflow a2 from the rotation axis direction becomes. When comparing the difference in the speed distribution in the direction of the rotating shaft due to the difference in the inflow conditions of the axial flow fan, the situation is as shown in FIG. 6 . The intersection of the vertical axis and the horizontal axis in FIG. 6 represents the position of the fan radius 0 of the axial flow fan (that is, the position of the fan center of the axial flow fan). It can be seen from FIG. 6 that the speed of the axial flow fan in the installation (solid line in FIG. 6 ) increases on average in the direction of the rotation axis due to the limitation of the flow path. That is, the average value of the velocity distribution of the inflow axial flow fan at the time of mounting becomes faster than the average value of the velocity distribution of the inflow axial flow fan at the time of opening to the atmosphere.

Therefore, the axial flow fan at the time of installation is used in a state different from the originally assumed state, so the air volume and static pressure drop.

Therefore, if the fan module 1 shown in FIG. 1 is used for the cooling of various information equipment like conventionally used axial flow fans, the barrier body arranged on the upstream side of the fan module (specific examples will be described later, However, it means that, for example, the disturbed air flow is rectified by the rectifying grill 2 and flows into the axial fan 3 . In this way, since the disturbed air flow does not flow into the axial fan 3, the noise generated is suppressed, and in addition, by improving the inflow conditions assumed under the design of the axial fan, even in the installed state, it is compatible with the Compared with the axial flow fan which does not have a rectification grille on the upstream side, the air volume and static pressure of the axial flow fan at the time of installation are increased.

[Example 2]

On the other hand, as shown in FIG. 1 , in the fan module 1, since the rectifying grille 2 is disposed in front of the axial flow fan 3, there is concern that the axial flow fan 3 may be damaged by the rotation of the boss 31 on which the motor is installed. Rotating the moving blades 32 may cause interference of the moving blade stator blades of the rectifying grid and the stator blades 22 , and there is a concern that noise at a frequency due to the number of the moving blades 32 or the stator blades 22 may increase.

On the other hand, in the second embodiment, by paying attention to the positional relationship between the stator blades 22 and the rotor blades 32 , an increase in noise at a frequency caused by the number of blades of the rotor blades 32 or the stator blades 22 is suppressed.

FIG. 7 is a part of the fan module 1 viewed from the upstream side of the airflow in the direction of the rotation axis of the rotor blade 32 . As described above, when the moving blade 32 rotating in the direction of the arrow in the drawing passes the stationary stator blade 22 , moving blade-stator blade interference occurs.

Regarding the circle 41 and the circle 42 that make the center and the boss 21 of the rectifying grid 2 the same and have any different radii, the intersection point of the circle 41 and the stator blade 22 is set as point 43, and the intersection point of the circle 42 and the stator blade 22 is set as For the point 44 , the intersection point of the circle 41 and the rotor blade 32 is defined as a point 45 , and the intersection point of the circle 42 and the rotor blade 32 is defined as a point 46 . When the line segment connecting point 43 and point 44 is set as line 47, and the line segment connecting point 45 and point 46 is set as line 48, the fan module of the second embodiment becomes, on circle 41, point 43 and point 45 When overlapping, or when point 44 and point 46 are overlapped on circle 42 , the structure in which line 47 and line 48 do not coincide. The so-called inconsistent structure means, for example, as shown in FIG. 7, when the point 46 on the moving blade 32 moves to a position overlapping with the point 44 on the stator blade, other points 45' on the moving blade 32 A state that does not overlap with point 43 on the stator blade.

This configuration can also be considered as a fan module that takes in and discharges air, and is characterized in that it has a rectifying grill provided on the upstream side with respect to the flow of air and an axial flow fan provided on the downstream side. When viewing the fan module from the direction of the axis of rotation of the axial fan, if two imaginary concentric circles with different radii are set, the rear edge of the stator vane constituting the rectifying grille and the moving part constituting the axial fan will The leading edges of the blades respectively have two intersections with the concentric circles, and the straight line connecting the two intersections on the trailing edges of the stator blades constituting the above-mentioned rectifying grid and the leading edge of the moving blades constituting the above-mentioned axial fan The straight line connecting the two intersection points is on one of the above two concentric circles, an intersection point on the trailing edge of the stator blade constituting the above-mentioned rectifying grid and on the leading edge of the moving blade constituting the above-mentioned axial flow fan When one of the intersection points overlaps, on the other of the two concentric circles, the other intersection point on the trailing edge of the stator blades constituting the above-mentioned rectifying grid and the leading edge of the moving blades constituting the above-mentioned axial flow fan Another intersection point on is inconsistent.

Furthermore, in this structure, when the front edge of the moving blade which comprises the said axial flow fan passes the trailing edge of the stator blade which comprises the said rectification grille, it is conceivable to always give the skew which intersects at one point. .

According to this structure, since the rotor blade 32 always passes the stator blade 22 at only one point, it is possible to minimize the area where the interference of the rotor blade and the stator blade simultaneously occurs. As an effect thereof, it is possible to suppress an increase in the sound pressure level of each frequency component of noise caused by the number of rotor blades 32 or stator blades 22 . FIG. 8 is a graph showing the effect of the second embodiment. From FIG. 8 , it can be confirmed that the fan module of the second embodiment shown in FIG. 7 reduces blade passing frequency noise (sound pressure level) due to the number of blades. In the case where Example 2 was implemented, the sound pressure level was generally lower than when Example 2 was not implemented. In addition, when "number of times of blade passing frequency" on the horizontal axis of FIG. 8 is set to n times, there is a relationship of (frequency of noise/(number of rotations of axial fan×number of blades))=n.

[Embodiment 3]

The third embodiment is that in the fan module of the first or second embodiment, the air volume during installation is further increased by adding a structure for deflecting the air flow by the stator blades. FIG. 9 is a cylindrical section of the fan module showing the positional relationship between the stator blades 22 and the moving blades 32 according to the third embodiment. The stator blades 22 of the rectifying grille and the moving blades 32 of the axial flow fan are arranged from the upstream side of the air flow, and the moving blades 32 rotate in the direction of rotation R. FIG. The stator vane 22 has a cross-sectional shape warped in a U-shape with respect to the direction of rotation R. As shown in FIG.

The velocity component 51 of the airflow toward the fan module is deflected by the stator blades 22 , thereby becoming the velocity component 52 of the airflow and flowing into the moving blade 32 . Therefore, due to the existence of the stator blades 22 , the airflow having the velocity component 54 of the airflow which is the velocity in the circumferential direction opposite to the rotation direction R flows into the moving blades 32 . That is, the stator blades are given reverse pre-rotation with respect to the rotor blades. Usually, when designing an axial flow fan, the airflow to the moving blade is designed so that it does not have a velocity component in the circumferential direction. However, when the axial flow fan is installed and used on various information devices, the airflow is disturbed and the airflow having a velocity component in the circumferential direction in the same direction as the rotation direction of the axial flow fan flows into the axial flow. fan. In addition, the velocity component 53 of the airflow has the same direction and the same magnitude as the velocity component 51 of the airflow flowing toward the fan module.

【Formula 1】

P _th = ρ(C _u2 u2-C _u1 u1)...Formula 1

P _th : Theoretical full pressure

ρ: density

C _u1 : Rotational speed of rotor blade inlet

C _u2 : Rotational speed of the rotor blade outlet

u ₁ : Peripheral speed at the inlet of the moving blade

u ₂ : Peripheral speed at the outlet of the moving blade

Equation 1 is an equation representing the theoretical total pressure of the axial flow fan. According to this formula, the theoretical total pressure of the axial fan can be obtained as follows: the circumference of the inlet of the axial fan is subtracted from the product of the rotational speed C _u2 and the rotational speed u ₂ from the speed component in the circumferential direction of the axial fan outlet The velocity component of the direction, that is, the difference obtained by the product of _Cu1 and the rotational velocity _u1 , is multiplied by the density ρ of the air. Therefore, it can be seen from this equation that when the airflow flowing into the axial fan has a velocity component in the circumferential direction in the same direction as the rotational direction of the axial fan, the total pressure of the axial fan will drop. On the other hand, the stator blade 22 of the third embodiment supplies the rotor blade 32 with an air flow having a velocity component in the circumferential direction opposite to the rotation direction R of the rotor blade 32 . According to formula 1, this kind of air flow will increase the theoretical total pressure of the axial flow fan, and then the static pressure will increase and the air volume will also increase.

[Example 4]

Fig. 10 is the fan module 11 of the fourth embodiment. The fan module 11 has a structure in which the first rectifying grill 2 , the axial flow fan 3 , and the second rectifying grill 6 are arranged in this order from the upstream side of the air flow. The first rectifying grid 2 and the axial fan 3 are the same as those in the first to third embodiments.

FIG. 11 is a diagram showing the structure of the second rectifying grill 6 . The second rectifying grid 6 is composed of a boss 61 , a plurality of stator vanes 62 extending from the boss and an outer frame 63 supporting the stator vanes.

FIG. 12 is a cylindrical cross section of the fan module showing the positional relationship between the stator blade 22 , the moving blade 32 and the stator blade 62 according to the fourth embodiment. The stator blades 22 of the first straightening grille, the moving blades 32 of the axial flow fan, and the stator blades 62 of the second straightening grille are arranged from the upstream side of the air flow, and the moving blades 32 rotate in the direction of rotation R. Here, the position of the trailing edge of the stator blade 62 relative to the leading edge in the rotational direction R is a positive position. In addition, the air flow that flows into the stator blade 22 and reaches the rotor blade 32 is the same as in FIG. 9 . Furthermore, the airflow flowing out from the rotor blade 32 flows into the stator blade 62 at the velocity component 55 . Airflow passing through stator blades 62 is rectified to exit at velocity component 56 .

【Formula 2】

$P_{\mathrm{the\; s}}=\mathrm{\&rho;}{\mathrm{\&eta;}}_{\mathrm{the\; <figure-callout\; id="2"\; label="s\; V"\; filenames="HSA00000760903600021.png,HSA00000760903600092.png"\; state="\{\{state\}\}">s</figure-callout>}}\frac{{V_{}}^{}}{}\frac{{{}_2}^2-{{\mathrm{<figure-callout\; id="3"\; label="V"\; filenames="HSA00000760903600031.png"\; state="\{\{state\}\}">V</figure-callout>}}_3}^2}{2}$ ...Formula 2

P _s : static pressure rise

ρ: density

η _s : static pressure efficiency

V ₂ : Absolute value of the velocity at the inlet of the stator blade

V ₃ : Absolute value of the velocity at the outlet of the stator blades

Equation 2 is an equation representing the rise in static pressure due to the second rectifying grille. According to this formula, the static pressure rise of the rectifying grid can be obtained as follows: the difference obtained by subtracting the square of the absolute value of the velocity of the stator blade outlet from the square of the absolute value of the velocity of the stator blade inlet _V2 is divided by 2. Multiply it with the air density ρ and the static pressure efficiency η _s . When this effect is associated with FIG. 12 , the speed 55 is changed to a speed 56 by being decelerated by the stator blades 62 . That is, the air volume is increased based on a rise in static pressure corresponding to the amount of deceleration.

[Embodiment 5]

FIG. 13 is the fan module 12 of the fifth embodiment. The fan module 12 is configured by serially arranging the rectifying grill 7 and the axial fan 3 sequentially from the upstream side of the air flow.

FIG. 14 is a diagram showing a specific structure of the rectification grid 7 of FIG. 13 . The rectifying grid 7 is composed of a boss 71 , a plurality of stator blades 72 extending from the boss, more than one guide ring 73 and an outer frame 74 supporting the stator blades. The number of vanes of the stator vanes 72 is set such that the interval between adjacent vanes is narrower than the finger size of a person using the server device, and further, entry of fingers is completely prevented by providing the guide ring 73 .

The fan module 12 implements safety measures during fan module replacement operations through the effect of completely preventing finger entry by the rectification grille 7 .

In addition, in the fifth embodiment, the guide ring 73 is not necessary, as long as the space between adjacent stator vanes 72 is narrower than fingers, the same effect can be obtained.

[Embodiment 6]

FIG. 15 is a schematic structural diagram of a PC server device installed with a fan module according to the sixth embodiment. A PC server device 8 , which is one type of server device, is composed of a chassis 81 , a unit 82 having an internal board on which a CPU is mounted, and a fan module 13 .

As the fan module 13, the fan module described in any one of Embodiment 1 to Embodiment 5 can be used. In this embodiment, the fan module 13 is formed into an integrated structure by bonding the rectifying grille and the axial flow fan, shortening The time required for the installation work and the replacement work of the fan module 13 is shortened.

[Embodiment 7]

Fig. 16 is the fan module of the seventh embodiment. The fan module 111 has a structure in which the fan module 14 and the fan module 15 are arranged in series. As the fan modules 14 and 15, the fan modules described in any one of the first to sixth embodiments can be used.

In the information equipment category, especially those related to high-density internal structures, the pressure loss of the equipment increases, so two or more axial flow fans are used in series for the purpose of obtaining the required cooling air volume by increasing the static pressure. . It is expected that the increase in static pressure corresponding to the increase in the number of axial flow fans can be obtained by using the axial flow fans in series, but in general, the effect alone cannot be obtained. For example, in the case of simply using two axial flow fans in series, although it is expected to obtain a static pressure increase of 2 times, in fact, only about 1.5 times the static pressure can be obtained.

As in Embodiment 7, when a plurality of fan modules described in any one of Embodiment 1 to Embodiment 6 are used in series, the static pressure will be reduced by modularizing the axial flow fan unit. As shown in Figure 17, in the case of using a single axial flow fan in series, the static pressure can be increased by more than 2 times.

In addition, the fan module 111 described in the seventh embodiment is a fan module in which two fan modules are arranged in series, but the effect of the seventh embodiment can be obtained without limiting the number of fan modules arranged in series. In addition, fan modules configured in series do not necessarily need to use the same fan module.

[Embodiment Eight]

Fig. 18 is the fan module of the eighth embodiment. The fan module 112 is composed of a first axial flow fan 3 , a first rectification grille 6 , a second rectification grille 2 and a second axial flow fan 3 sequentially arranged in series from the upstream side of the air flow.

Moreover, when the fan module is viewed from the direction of the rotation axis of the second axial flow fan, it is characterized in that if two imaginary concentric circles with different radii are set, the stator blades constituting the second rectifying grille There are two intersections between the trailing edge of the moving blade and the leading edge of the moving blade constituting the above-mentioned second axial flow fan and each of the concentric circles, and the two intersection points on the trailing edge of the stator blades that will constitute the second rectifying grid The straight line connecting the straight line and the straight line connecting the two points of intersection on the front edge of the moving blade constituting the second axial flow fan is on one of the two concentric circles, and the stator constituting the second rectifying grid When an intersection point on the trailing edge of the blade overlaps with an intersection point on the leading edge of the moving blade constituting the second axial flow fan, the second rectifier is formed on the other concentric circle of the two concentric circles. Another intersection point on the trailing edge of the stator blade of the grill does not coincide with another intersection point on the leading edge of the moving blade constituting the above-mentioned second axial flow fan.

Further, the second axial fan has moving blades, the second rectifying grid has stator blades, and preferably, the inclination direction of the moving blades is opposite to the inclination direction of the stator blades.

The fan module 112 can obtain a static pressure increase higher than that of the case of using axial fans in series in the same manner as in the seventh embodiment. Especially when the size of the fan module is limited and the structure of the seventh embodiment cannot be adopted, it can play an effect.

[Embodiment 9]

Fig. 19 is the fan module of the ninth embodiment. The fan module 113 has a structure in which the fan module 16 and the fan module 17 are arranged in parallel.

In information equipment, especially when the air volume is increased due to the low-density internal structure, the cooling air volume can be increased by using axial fans in parallel. As in the ninth embodiment, by using the axial fans in parallel, the cooling air volume at the time of installation can be increased compared to the use of the axial fans in parallel.

In addition, the fan module 113 described in Embodiment 9 is a fan module in which two fan modules described in any one of Embodiment 1 to Embodiment 8 are arranged in parallel, but there is no need to limit the number of fan modules arranged in parallel, and, Fan modules configured in parallel do not necessarily need to use the same fan module to achieve its effect.

[Embodiment 10]

FIG. 20 is a schematic configuration diagram of a blade server device which is an example of the server device of the tenth embodiment. The blade server 9 is composed of a housing 91 , an electronic equipment unit 92 including a server blade, and a fan module 1111 .

As the fan module 1111, for example, by combining a plurality of fan modules according to Embodiments 1 to 9, the effects of increasing the air volume and reducing the noise of the blade server 9 can be obtained.

In addition, the use of the fan module in Embodiment 10 is not limited to blade server equipment, and may also be a fan module targeting all types of server equipment such as rack servers and PC servers.

In addition, this invention is not limited to the said Example, Various modification examples are possible. For example, the above-mentioned embodiments have been specifically described to facilitate understanding of the present invention, but are not necessarily limited to all the configurations described. In addition, a part of the structure of a certain example can be replaced with the structure of another example, and the structure of another example can also be added to the structure of a certain example. Furthermore, addition, deletion, and replacement of other configurations can be performed on a part of the configurations of the respective embodiments.

In addition, each of the aforementioned configurations, functions, processing units, processing devices, and the like may be realized in part or in whole by hardware, for example, by designing with an integrated circuit or the like. In addition, the above-mentioned configurations, functions, and the like can also be realized by software by interpreting and executing a program for realizing each function by a processor. Information such as programs, forms, and files that realize each function can be stored in a memory, a hard disk, a recording device such as a SSD (Solid State Drive, or a solid state drive), or a recording medium such as an IC card, SD card, or DVD.

In addition, the control lines and information lines are shown in consideration of the need for explanation, and not all control lines or information lines are necessarily shown on the product. In fact, it can also be considered that almost all structures are interconnected.

Claims (10)

1. A fan module that takes air in and exhausts it, characterized in that, having a rectifying grill arranged on the upstream side with respect to the flow of air and an axial flow fan arranged on the downstream side, When the fan module is viewed from the direction of the rotation axis of the axial flow fan, the trailing edge of the stator blades constituting the rectifying grille and the leading edge of the moving blades constituting the axial flow fan respectively have different radii. Each of the two concentric circles has two intersection points, and the straight line connecting the two intersection points on the trailing edge of the stator vane constituting the rectifying grille and the two intersecting points on the leading edge of the moving blade constituting the axial flow fan A straight line connected by two intersection points, on one of the two concentric circles, an intersection point on the trailing edge of the stator vanes constituting the rectifying grid and the leading edge of the moving blades constituting the axial flow fan In the case where one intersection point on the above overlaps, on the other concentric circle of the two concentric circles, another intersection point on the trailing edge of the stator blades constituting the rectifying grille and the moving part constituting the axial flow fan Another point of intersection on the leading edge of the blade is inconsistent. 2. The fan module according to claim 1, characterized in that, The direction of inclination of the moving blades is opposite to the direction of inclination of the stator blades. 3. The fan module according to claim 1 or 2, characterized in that, The stator blades constituting the rectifying grid are warped in a U-shape. 4. The fan module according to claim 3, characterized in that, The stator blades are given reverse pre-rotation with respect to the rotor blades. 5. The fan module according to any one of claims 1-4, characterized in that, A rectification grille is also disposed on the downstream side of the axial flow fan. 6. The fan module according to claim 5, characterized in that, The position of the trailing edge of the stator vane constituting the rectifying grill disposed on the downstream side of the axial fan is a positive position with respect to the leading edge in the rotation direction of the axial fan. 7. The fan module according to any one of claims 1-6, characterized in that, The space between adjacent stator blades constituting the rectifying grid is narrower than the width of a finger. 8. The fan module according to any one of claims 1-7, characterized in that, The axial fan constituting the fan module is integrated with the rectification grille. 9. A fan module, characterized in that a plurality of fan modules according to any one of claims 1 to 8 are combined in series or in parallel. 10. A server device, characterized in that the fan module according to any one of claims 1-9 is installed.

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