JP2009085037A - Cross flow fan and electronic equipment with cross flow fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cross flow fan usable as a cooling fan and electronic equipment having the cross flow fan. <P>SOLUTION: The cross flow fan is provided with an impeller formed to have a cylindrical shape, a drive motor for rotating the impeller around the center axis by cooperatively connecting a rotating shaft to a center axis portion of the impeller, a suction guide body arranged opposing to the impeller and constituting a suction port for sucking air along with the rotation of the impeller, and a sending-out guide body arranged opposing to the impeller and constituting a sending-out port for sending out air along with the rotation of the impeller. In the cross flow fan and electronic equipment having the cross flow fan, an opposing face of the sending-out guide body to the impeller is a circumferential face-shaped bent face along the circumferential face of the impeller, and an interval dimension between the circumferential face-shaped bent face and the impeller is set to be 5% or less of the diameter dimension of the impeller. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a crossflow fan and an electronic apparatus including the crossflow fan.

  2. Description of the Related Art Conventionally, in electronic devices such as personal computers, a temperature rise occurs in an electric circuit or an electronic circuit by releasing a part of electric power consumed in the electric circuit or the electronic circuit provided in the housing as heat energy. It is known that there is a risk of causing a malfunction such as thermal runaway or failure due to heat.

  Therefore, an exhaust means for exhausting the air inside the casing to the outside of the casing is provided inside the casing, and this exhaust means causes the air to flow inside the casing and takes in the outside air having a low temperature into the casing. The inside of the housing is air-cooled (see, for example, Patent Document 1).

  However, in an electronic device having a very small housing such as a notebook computer, it is difficult to dispose a large fan inside the housing, so that a sufficient cooling effect may not be obtained. In consideration of the cooling effect obtained by the fans to be arranged, the electronic components to be arranged inside the housing are selected.

  In view of such a current situation, the present inventors have been conducting research and development of a cooling method having a more efficient cooling effect in order to improve the capacity of a small electronic device having a small housing, and in various fans I tried again to verify the cooling capacity.

  Specifically, the inventors of the present invention have three types of cross-flow fans for blowing air provided in an indoor unit of an air conditioner, as well as an axial fan and a centrifugal fan that are generally used as cooling fans. I measured the pressure and flow rate. Note that the crossflow fan is also called a crossflow fan.

  As a result, although the axial fan has an excellent balance between pressure and air volume, it is necessary to increase its size and rotation in order to obtain the desired performance. It has been confirmed that the noise is inappropriate and the noise may be significantly increased by increasing the rotation speed.

  Further, the most commonly used centrifugal fan has a feature that it can obtain a large pressure although its flow rate is small, and it has been confirmed that it is suitable for the purpose of sucking out air inside the housing. However, in order to obtain the desired performance, at least one of large size and high rotation is required, and it is required to be small and have low noise such as a notebook computer. Was not suitable.

In general, cross-flow fans that are not often used for cooling cannot obtain the same pressure as centrifugal fans, but it has been reconfirmed that the flow characteristics are very good compared to other fans. It has been confirmed that the flow rate can be further increased by extending the axial length. In particular, there is a possibility that a sufficient flow rate can be obtained even at a relatively low rotation, and it can be expected as a fan with low noise and a large flow rate.
JP 2001-195154 A

  Thus, in view of only the balance between the pressure characteristics and the flow characteristics, the centrifugal fan is suitable for cooling the inside of the housing, but is easily affected by the downsizing of the fan accompanying the downsizing of the housing, Moreover, since there is a high demand for low noise in recent years, a centrifugal fan is not necessarily optimal when considering use at a relatively low speed.

  Based on the verification results described above, the present inventors consider that a cross-flow fan can be used as long as the pressure characteristics can be improved, and research and development have been conducted to improve the pressure characteristics of the cross-flow fan, leading to the present invention. It is a thing.

  In the crossflow fan of the present invention, the impeller formed in a cylindrical shape, a drive motor that interlocks and connects the rotation shaft to the central shaft portion of the impeller, and rotates the impeller around the central shaft, and the impeller is opposed to the impeller. A suction guide body that constitutes a suction port that sucks air along with the rotation of the impeller, and a sending outlet that is disposed opposite to the impeller and sends out air as the impeller rotates. In the crossflow fan having the delivery guide body to be configured, the delivery guide body has a surface facing the impeller as a circumferential curved surface along the circumferential surface of the impeller, and the circumferential curved surface and the blades. The distance from the car was set to 5% or less of the diameter of the impeller.

  Furthermore, in the cross-flow fan of the present invention, in the drive motor, the rotating shaft protrudes from both the left and right sides of the main body that houses the coil portion, and the impeller is linked and linked, and the delivery guide body and the impeller The distance dimension is gradually expanded as the distance from the drive motor increases. In particular, the distance dimension is 2% of the diameter dimension of the impeller on the drive motor side.

  Further, an electronic device equipped with the crossflow fan of the present invention incorporates the above-described crossflow fan in the housing, and cools the inside of the housing by sending out the air inside the housing to the outside of the housing. Another characteristic is that the body is formed integrally with the housing.

  In the crossflow fan of the present invention, the surface facing the impeller in the suction guide body is a circumferential curved surface along the circumferential surface of the impeller, and the distance between the circumferential curved surface and the impeller is By setting the impeller diameter to 5% or less of the impeller diameter, it is possible to provide a cross-flow fan with good pressure characteristics.

  Therefore, in the electronic device in which the cross-flow fan is built in the housing, the inside of the housing can be effectively cooled. Note that the electronic device is not limited to a notebook computer, and the inside of the housing is cooled like an electronic device such as a desktop personal computer, a server device, a DVD player, or an electronic device such as a flat-screen TV. Any electronic device may be used.

  In addition, when the delivery guide body is formed integrally with the housing, the delivery guide body itself can be used as a reinforcing structure for the housing, contributing to improved rigidity of a thin housing such as a laptop computer. In addition, the high cooling efficiency improves the processing speed and improves the performance, and also provides a highly rigid electronic device such as a laptop computer.

  The electronic device including the cross flow fan and the cross flow fan of the present invention can be used as a cooling fan by improving the pressure characteristics of the cross flow fan. In particular, a cross flow fan can easily obtain a large flow rate compared to an axial flow fan or a centrifugal fan, and a sufficient flow rate can be easily obtained even if the impeller of the cross flow fan is rotated at a relatively low speed. It can be an efficient cooling fan.

  The cross flow fan has lower pressure characteristics than the centrifugal fan, and in the past, the suction efficiency of the air inside the housing was low, but it constitutes a delivery port that sends out air as the impeller rotates A circumferential curved surface along the circumferential surface of the impeller is provided on the surface of the delivery guide body facing the impeller, and the distance between the circumferential curved surface and the impeller is set to the diameter of the impeller. The present inventors have found that a sufficient pressure can be obtained by setting it to 5% or less, and the use as a cooling fan is possible.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of a notebook computer incorporating a cross-flow fan A according to the present embodiment, and FIG. In the present embodiment, the cross current fan A is built in the case B of the notebook computer. However, the cross current fan of the present invention is not limited to the case of the laptop computer, but also in a desktop personal computer or server device. Various types that require cooling by a cooling fan, such as a rectangular box-shaped casing, a rectangular box-shaped casing in an electronic device such as a DVD player, or a casing of an electronic device such as a flat-screen television such as a liquid crystal television or a liquid crystal display It can be used by being incorporated in a casing of an electronic device. In FIG. 1, D is a display in a notebook personal computer, and in FIGS. 1 and 2, d1 is a hinge part that rotatably connects the display D to the housing B.

  As shown in FIG. 1, the cross-flow fan A has an impeller 10 formed in a cylindrical shape, and a rotary shaft 21 is interlocked and connected to a central axis portion of the impeller 10 to rotate the impeller 10 around the central axis. Arranged so as to oppose the drive motor 20 and the impeller 10, and opposed to the impeller 10 and the suction guide body 30 constituting the suction port 31 that sucks air as the impeller 10 rotates. And a delivery guide body 40 that constitutes a delivery port 41 that delivers air as the impeller rotates.

  The impeller 10 includes a plurality of circular partition plates 11 arranged at predetermined intervals along the rotation axis direction, and a plurality of blades 12 installed between adjacent partition plates 11 along the circumferential direction of the partition plate 11. Is formed by.

  The partition plates 11 located at both ends of the impeller 10 are disk-shaped and have a central shaft 13 projecting from the central portion. The other partition plates 11 are reduced in weight as a circular shape having a hole in the center. In FIGS. 1 and 2, reference numeral 14 denotes a bearing that rotatably supports the central shaft 13 of the impeller 10.

  Each of the blades 12 is a narrow plate body, which is curved with respect to the central direction of the partition plate 11 as shown in FIG. 2 and is installed between the adjacent partition plates 11 at a predetermined angle. An air flow can be generated as the vehicle 10 rotates.

  In the present embodiment, the drive motor 20 that rotationally drives the impeller 10 has the rotating shafts 21 and 21 projecting from the left and right sides of the main body housing the coil portion, and the impeller 10 The central axis (not shown) is interlocked.

  That is, in the cross-flow fan A of this embodiment, the two impellers 10 and 10 are rotationally driven by one drive motor 20, and the drive motor 20 is provided between the two impellers 10 and 10. is there.

  In this way, by using the cross-flow fan A with the drive motor 20 disposed in the center, the air flow generated by the respective impellers 10 is generated on both sides of the drive motor 20 and thus generated in the drive motor 20 portion by this air flow. Heat can be easily sent out of the housing B, and the drive motor 20 can suppress an increase in temperature inside the housing B.

  Furthermore, there is no possibility that the stress acting on the rotating shaft 21 of the drive motor 20 is biased, and the impeller 10 can be rotated by driving the drive motor 20 smoothly. Further, the position of the center of gravity of the cross-flow fan A can be set near the center of the cross-flow fan A, and the cross-flow fan A having a good weight balance can be obtained.

  In addition, since each impeller 10 can be shortened, the rigidity of the impeller 10 can be improved, and the impeller 10 can be stably rotated without causing extra vibration or the like. Therefore, as will be described later, it is possible to improve the accuracy of the gap provided between the delivery guide body 40.

  In this embodiment, the impeller 10 is mounted by projecting the rotation shaft 21 to the left and right of one drive motor 20, but if there is no problem in weight, two drives each having one rotation shaft are provided. The motor may be arranged in the center, and the impellers may be arranged on the left and right sides of the motor so that one drive motor rotates and drives one impeller.

  Further, in the present embodiment, the same impellers 10 and 10 are mounted on the drive motors 20 with the rotation shafts 21 and 21 projecting from the left and right sides of the main body, respectively. The impeller 10 mounted on the left side of the drive motor 20 and the impeller mounted on the right side of the drive motor 20 are different from each other, and the drive motor 20 is moved from the center of the cross-flow fan A. You may arrange | position in the displaced position.

  As shown in FIG. 2, the suction guide body 30 is disposed to face the impeller 10. The suction guide body 30 is provided with a suction port edge 32 which forms a narrow gap with the impeller 10 and serves as a suction port 31, and the downstream side of the suction port edge 32 is a required curved surface 33. On the surface 33, the size of the gap with the impeller 10 is gradually expanded to form an expanded air flow passage 34.

  In particular, in the present embodiment, the suction guide body 30 is provided with a bulging portion 35 bulging upward on the suction port 31 side, and the position of the suction port edge 32 is positioned near the center in the thickness direction of the housing B. I am letting. Thus, by setting the position of the suction port edge 32 in the vicinity of the center in the thickness direction of the casing B, the position of the suction port 31 can be set in the vicinity of the center in the thickness direction of the casing B. The inside air can be sucked substantially evenly, and can be sucked effectively without causing the air to stay in the housing B.

  Further, as shown in FIG. 2, the delivery guide body 40 is also arranged to face the impeller 10. In particular, the delivery guide body 40 is provided with a bulging portion 42 that bulges along the peripheral surface of the impeller 10, and the impeller is disposed on the opposed surface of the bulging portion 42 that faces the impeller 10. A circumferential curved surface 43 having a circumferential shape along 10 circumferential surfaces is provided.

  It is desirable for the circumferential curved surface 43 to be as small as possible in distance from the impeller 10. That is, the outer diameter of the impeller is 20 mm, the inner diameter of the impeller is 15 mm, the length of the impeller is 30 mm, the number of blades is 24, the inner peripheral blade angle is 90 °, the outer peripheral blade angle is 25 ° 36 ′, the blade Static pressure rise-flow rate characteristics when the distance between the curved surface 43 and the impeller 10 is 3.0 mm, 2.0 mm, and 1.0 mm while rotating the impeller 10 with a string length of 2.93 mm at 4000 rpm As is apparent from FIG. 3 showing the graph, by making the distance between the circumferential curved surface 43 and the impeller 10 5% or less of the diameter of the impeller 10, a very remarkable characteristic improvement is observed. I understand that.

The horizontal axis in the graph of FIG. 3 is the dimensionless flow coefficient φ, the vertical axis is the dimensionless static pressure coefficient ψ, and the volume flow rate Q [m ³ / s], static pressure increase P _s , rotational speed N [1 / s], air density ρ [kg / m ³ ], blade diameter D _l [m], impeller length L _b [m] It is what.

周面状湾曲面43と羽根車10との間隔寸法は、狭ければ狭いほどよいことが確認されたが、周面状湾曲面43と羽根車10との間隔寸法を狭くすると、騒音が大きくなる傾向があり、好適には羽根車10の直径寸法の２〜５％であった。

It was confirmed that the smaller the gap between the circumferential curved surface 43 and the impeller 10 is, the better. However, when the gap between the circumferential curved surface 43 and the impeller 10 is narrowed, the noise increases. Preferably 2 to 5% of the diameter of the impeller 10.

  Here, the distance between the circumferential curved surface 43 and the impeller 10 does not necessarily have to be constant along the rotation axis direction of the impeller 10. For example, as shown in FIG. In the crossflow fan A provided along the left-right direction, the distance between the circumferential curved surface 43 and the impeller 10 may be gradually expanded as the distance from the drive motor 20 increases.

  As described above, the distance between the circumferential curved surface 43 and the impeller 10 is gradually expanded as the distance from the drive motor 20 increases, so that the distance between the impeller 10 and the drive motor 20 is minimized. As a result, an air flow having a larger flow velocity than the left and right regions of the housing B can be generated in the central region of the housing B, and the cooling efficiency in the housing B can be improved.

  Specifically, on the drive motor 20 side, the distance between the circumferential curved surface 43 and the impeller 10 is about 2% of the diameter of the impeller 10, and the distance from the impeller 10 as the distance from the drive motor 20 increases. It is desirable to gradually expand the dimensions to a final level of about 5%.

  On the drive motor 20 side, since the impeller 10 is firmly supported by the drive motor 20, it is possible to make it difficult for the impeller 10 to undergo position fluctuations during rotational driving, and the circumferential curved surface 43 and the impeller 10 Even if the distance dimension is reduced, desired characteristics can be easily obtained. Therefore, the distance between the circumferential curved surface 43 and the impeller 10 can be reliably adjusted to 2 to 5% of the diameter of the impeller 10.

  The suction guide body 30 is formed integrally with the lower cover body b1 in the casing B as shown in FIG. 2, and the delivery guide body 40 is integrated with the upper cover body b2 in the casing B as shown in FIG. Is formed.

  As described above, the suction guide body 30 and the delivery guide body 40 are integrally formed with the lower cover body b1 and the upper cover body b2, so that the suction guide body 30 and the delivery guide body 40 are reinforced in the housing B. And the rigidity of the backward movement B can be improved.

  In particular, in the present embodiment, as shown in FIG. 1, since the cross flow fan A is provided in the vicinity of the hinge part d1 that supports the display D, the case B is easily deformed when the display D is opened and closed. Since it can suppress by the suction guide body 30 and the delivery guide body 40, it can make it hard to produce a damage.

  Further, when the suction guide body 30 and the delivery guide body 40 are configured together with the housing B, the cross flow fan accommodated in the case having the suction guide body 30 and the delivery guide body 40 is generally accommodated in the housing B. Rather than doing this, the case B can be made smaller and thinner as much as the case is unnecessary.

  Alternatively, instead of downsizing / thinning the casing B, the space obtained by integrally forming the suction guide body 30 and the delivery guide body 40 with the lower cover body b1 and the upper cover body b2 By utilizing the diameter of the wheel 10 to increase the blade peripheral speed of the impeller 10, it is possible to cause a significant pressure increase. Therefore, since the impeller 10 can be rotated at a lower speed, noise can be reduced. As described above, the size of the impeller 10 and the size of the housing B can be arbitrarily set in consideration of the cooling efficiency, noise, and compactness.

  In addition, in the present embodiment, as shown in FIG. 2, the lower cover body b1 is formed in order to form the expanded air flow passage 34 on the downstream side of the suction port 31 by the impeller 10 and the suction guide body 30. In the vicinity of the impeller 10, a curved bulging portion b3 bulged downward is provided. Thus, by providing the curved bulging portion b3, it is possible to suppress an increase in the thickness dimension of the housing B due to the built-in impeller 10. In particular, in the case of a notebook personal computer as in this embodiment, the curved bulging portion b3 can be used as a stand, which can contribute to an improvement in convenience.

  The arrangement position of the cross flow fan A is not limited to the case where it is provided on the side edge on the back side of the housing B, and may be at least one of the left and right sides of the housing B if possible. In addition, as shown in FIG. 1, when the crossflow fan A is provided in the side edge of the back | inner side of the housing | casing B, the inside of the housing | casing B is uniformly uniform by the airflow formed uniformly by the crossflow fan A. In particular, the keyboard portion and handrest portion of the notebook personal computer can be effectively cooled, so that excessive heating during use can be suppressed and the usability can be improved.

  In FIG. 2, the suction guide body 30 is drawn as if there is no space on the back surface side of the curved surface 33 and the back surface side of the circumferential curved surface 43 of the delivery guide body 40. The curved surface 33 of the 30 and the circumferential curved surface 43 of the delivery guide body 40 are each configured by a flat plate that is curved into a predetermined shape, and the flat plates are respectively positioned at predetermined positions of the lower cover body b1 and the upper cover body b2. It may be possible to reduce the weight as much as possible by fixing it to the rib provided on the.

  In the embodiment described above, the case B in the notebook computer has been described, but the same applies to the case of other electronic components.

It is explanatory drawing of the arrangement | positioning state of the crossflow fan which concerns on embodiment of this invention. It is a principal part longitudinal cross-sectional view of FIG. It is the graph which showed the effectiveness by the difference in the space | interval dimension of a circumferential curved surface and an impeller.

Explanation of symbols

A Cross current fan B Enclosure
b1 Lower cover body
b2 Top cover body
b3 Curved bulge D Display
d1 Hinge part
10 impeller
11 Partition plate
12 feathers
13 Center axis
14 Bearing
20 Drive motor
21 Rotation axis
30 Suction guide body
31 Suction port
32 Suction mouth edge
33 Curved surface
34 Flow path
35 bulge
40 Delivery guide
41 Outlet
42 bulge
43 Circumferential curved surface

Claims (6)

An impeller formed in a cylindrical shape;
A drive motor that rotationally drives the impeller around the central axis by interlockingly connecting a rotary shaft to the central shaft portion of the impeller;
A suction guide body that is arranged to face the impeller and constitutes a suction port that sucks air with the rotation of the impeller;
In the cross flow fan that is disposed to face the impeller and has a delivery guide body that constitutes a delivery outlet that sends out air as the impeller rotates,
The delivery guide body has a surface facing the impeller as a circumferential curved surface along the circumferential surface of the impeller, and an interval between the circumferential curved surface and the impeller is set to the blade A cross-flow fan characterized by being 5% or less of the vehicle diameter.   2. The cross-flow fan according to claim 1, wherein the drive motor projects the rotating shafts on both the left and right sides of the main body that houses the coil portion, and interlocks the impeller with each other.   The cross flow fan according to claim 2, wherein a distance between the delivery guide body and the impeller is gradually expanded as the distance from the drive motor increases.   The cross flow fan according to claim 3, wherein a distance between the delivery guide body and the impeller is 2% of a diameter of the impeller on the drive motor side.   An electronic apparatus comprising the cross-flow fan that cools the inside of the housing by incorporating the cross-flow fan according to any one of claims 1 to 4 in the housing and sending out air in the housing to the outside of the housing. .   6. The electronic apparatus with a crossflow fan according to claim 5, wherein the delivery guide body is formed integrally with the housing.

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