JP2006070808A - Impeller and blower fan provided with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impeller and a blower fan provided with it by which sucked air is efficiently sent in the centrifugal direction thereby to improve efficiency of suction, and obtain a high air-volume, a high static pressure is obtained by restraining effluent of the air, at least the same performance can be achieved at low speed of rotation as compared with conventional blower fans, further, noise which becomes higher with increase in the number of revolutions can be reduced. <P>SOLUTION: The impeller 1 of a centrifugal type comprises a boss part 2, and a plurality of blades 3 radially extending from the periphery of the boss part 2. Each blade 3 is constituted to have a retreating blade part 4 extended from the periphery of the boss part 2 and curved or bent in the direction reverse to the rotation direction of the impeller 1, and an advancing blade part 5 which is extended from the end on the periphery of the retreating blade part 4 through an inflection part 6, and curved or bent in the rotation direction of the impeller 1. The blower fan is provided with a flat casing, upper and lower suction ports, an exhaust port, and the impeller 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an impeller used for a centrifugal blower fan and a blower fan including the impeller.

  In recent years, various electronic devices have been required to be smaller and thinner. On the other hand, as electronic devices have become more multifunctional, the inside of a housing tends to have a higher density and the amount of heat generation tends to increase. For this reason, it is strongly required to cool the heat generating elements and heat generating components such as the drive circuit board and the power supply unit inside the housing and efficiently dissipate the generated heat to the outside.

  A blower fan is widely used as an element for exhausting air inside the casing to the outside of the casing in order to cool the heat generating elements and the heat generating components. Such a blower fan is required to be small or thin because elements and parts are mounted at a high density inside the housing of the electronic device. Therefore, as a small or thin blower fan, a centrifugal blower fan as disclosed in Patent Document 1 or Patent Document 2 has been widely used in recent years. Centrifugal blower fans draw air from both sides or one side of the impeller in the direction of the rotation axis, send it in the centrifugal direction orthogonal to the rotation axis, and exhaust it in the direction of the heat generating part and heat dissipation part. Therefore, since it can be used by arranging side by side on the side of the heat generating element, the heat generating component, or the heat radiating portion, it is preferably used particularly for a thin electronic device with a small empty space inside the housing.

  Patent Document 1 includes an impeller including a cylindrical boss, a plurality of wide ribs extending in a radial direction from the outer peripheral surface of the boss, and a blade provided on the rib at a position away from the outer peripheral surface of the boss. And a fan motor provided with the impeller.

In Patent Document 2, an impeller having blades disposed in a substantially radial manner at regular intervals in the circumferential direction with a longitudinal direction sandwiched between a disk-shaped main plate and an annular side plate facing the main plate, and the impeller A multi-blade forward fan is disclosed that includes a casing that is supported and installed inside and that introduces air from the side plate side and blows it out in the circumferential direction.
Japanese Patent Laid-Open No. 2004-52735 JP 2000-145893 A

  However, in the above conventional technique, like the impeller blades described in Patent Document 1, the blade portion of the impeller is generally linear. When the blade part is straight, the air flow and static pressure can be increased by increasing the length and width of the blade and increasing the area of the blade, but the overall size increases, making it difficult to mount on a small or thin electronic device. It had the problem that.

  The air volume and static pressure can also be increased by increasing the number of revolutions of the impeller, but the problem is that the generated noise increases, making it difficult to install in acoustic equipment and information processing equipment that require quietness. Had.

The multi-blade forward fan of Patent Document 2 has a problem in that since the exit angle of the blades is formed as large as 150 ° or more, the pressure loss increases and the air volume and static pressure both decrease. In particular, when the inner wall of the casing is disposed in the vicinity of the tip of the blade of the centrifugal blower fan connected from the boss, the pressure loss increases remarkably when the blade outlet angle is 150 ° or more, and the air volume and There was a problem that the static pressure gradually decreased.

  The present invention solves the above-described conventional problems, and efficiently sends out the air sucked in the inner peripheral side of the blade portion in the centrifugal direction, thereby increasing the intake efficiency and obtaining a high air volume, and also providing the outer peripheral side of the blade portion. An object of the present invention is to provide an impeller capable of obtaining a high static pressure by appropriately suppressing the outflow of air from the surface of the blade portion.

  In addition, the present invention solves the above-described conventional problems, and by obtaining a high air volume and high static pressure, it is possible to achieve the same or higher performance at a lower rotational speed than a conventional blower fan, and increases with the rotational speed. It aims at providing the ventilation fan which can reduce a noise.

  In order to solve the above problems, an impeller according to the present invention is an impeller of a centrifugal air blower fan that includes a cylindrical boss portion and a plurality of blade portions extending radially from the outer peripheral surface of the boss portion, The blade part extends from the outer peripheral surface of the boss part and curves or bends in the direction opposite to the impeller rotation direction, and extends from the outer peripheral end of the reverse blade part via the inflection part and curves in the impeller rotation direction. Alternatively, the forward wing portion is bent, and the backward wing portion is positioned closer to the rotation shaft center side of the impeller than the forward wing portion.

  As a result, the intake air can be efficiently sent out in the centrifugal direction to increase the intake efficiency to obtain a high air volume, and the air can be discharged from the surface of the blade part on the outer periphery side of the blade part. An impeller capable of obtaining a high static pressure by being appropriately suppressed can be provided.

  In order to solve the above problems, a blower fan according to the present invention includes a flat casing, upper and lower intake ports formed on the upper and bottom walls of the casing, and an exhaust port formed on the side wall of the casing. And an impeller disposed inside the casing, wherein the impeller includes a cylindrical boss portion and a plurality of blade portions extending radially from the outer peripheral surface of the boss portion. An impeller, wherein a blade portion extends from the outer peripheral surface of the boss portion and is bent or bent in a direction opposite to the rotation direction of the impeller, and the impeller extends from the outer peripheral side end portion of the reverse wing portion via the inflection portion. And a forward wing portion curved or bent in the rotational direction of the forward wing portion, and the backward wing portion is positioned closer to the center of the impeller rotation axis than the forward wing portion.

  Thereby, by obtaining a high air volume and a high static pressure, it is possible to provide a blower fan that can achieve performance equal to or higher than a conventional blower fan at a low rotational speed and can reduce noise that increases with the rotational speed. .

  As described above, according to the impeller of the present invention and the blower fan including the impeller, the following advantageous effects can be obtained.

  According to the first aspect of the present invention, the swept wing portion is bent or bent in the direction opposite to the rotation direction of the impeller, and the front surface thereof is inclined toward the outer peripheral side, so that the intake air is efficiently directed toward the outer peripheral side. Since the forward wing is curved or bent in the direction of rotation of the impeller and the front surface thereof is inclined toward the inner peripheral side, it is difficult for air to flow out from the front surface of the forward wing, It is possible to provide an impeller that can be pushed out strongly, can increase both air volume and static pressure, and can improve fan performance.

In addition, since the backward wing and the forward wing are connected by a smooth inflection, the pressure loss when air is sent from the inner periphery to the outer periphery of the blade can be reduced. Thus, it is possible to provide an impeller that can suppress the vortex flow and reduce noise and also prevent a decrease in air volume and static pressure.

  According to the second aspect of the present invention, in addition to the effect of the first aspect, since the backward wing portion and the forward wing portion are formed symmetrically, the balance between the intake air and the exhaust air is good, and the intake air is efficiently discharged to the outer periphery. As a result, the exhausted air can be efficiently and strongly pushed out and exhausted. As a result, a high air volume and a high static pressure can be obtained at a low rotation, and a low noise impeller can be provided.

  According to the third aspect of the present invention, in addition to the effect of the first or second aspect, in addition to the effect of the first or second aspect, the reverse wing portion and the forward wing blade are provided in accordance with the opening diameter of the intake air and the outer diameter of the impeller. By making the ratio of the length with the part in the range of 1: 0.5 to 1.5, the balance between the intake and exhaust can be adjusted appropriately, and the intake air is efficiently sent to the outer peripheral part, the efficiency It is possible to provide a low-noise blower fan that is capable of extruding and exhausting well and is excellent in fan performance capable of obtaining a high air volume and high static pressure.

  According to the fourth aspect of the invention, in addition to the effect of any one of the first to third aspects, the exit angle of the swept wing portion is 10 ° to 50 °. It is possible to provide an impeller that can be sent out toward the outer peripheral side of the section and can increase the intake efficiency.

  In addition, since the air can be efficiently sucked in, the vortex flow during the air sucking is suppressed, and the turbulent noise caused by the air intake can be reduced, so that a low noise blower fan can be provided.

  According to the fifth aspect of the invention, in addition to the effect of any one of the first to fourth aspects, since the exit angle of the forward wing portion is 55 ° to 110 °, the air is in front of the forward wing portion. Thus, it is possible to provide an impeller that can increase the static pressure without impairing the force of strongly pushing air outward.

  According to the sixth aspect of the invention, since the impeller has the backward wing portion and the forward wing portion, the sucked air can be efficiently and strongly sent out and exhausted, and a high air volume and high static pressure can be obtained. It is possible to provide a blower fan having excellent fan performance.

  In addition, it is possible to provide a low-noise blower fan that can achieve the same or higher performance at a lower rotational speed than conventional blower fans and can reduce noise that increases with the rotational speed.

  According to the seventh aspect of the invention, in addition to the effect of the sixth aspect, the peripheral portion of the substantially circular upper air inlet and / or lower air inlet is located in the vicinity of the inflection portion of the impeller. Thus, it is possible to provide a blower fan with high intake efficiency that can efficiently send out the air introduced into the retreat wing part.

  In the present invention, the intake air is efficiently sent out in the centrifugal direction on the inner peripheral side of the blade part to increase the intake efficiency and obtain a high air volume, and the air flows out from the surface of the blade part on the outer peripheral side of the blade part. For the purpose of providing an impeller capable of obtaining a high static pressure by making it difficult to do so, a blade portion of the impeller extends from the outer peripheral surface of the boss portion, and a retracted wing portion curved or bent in a direction opposite to the rotation direction of the impeller, A forward wing portion that extends from the outer peripheral side end of the backward wing portion via the inflection portion, and is curved or bent in the rotation direction of the impeller, and the backward wing portion is positioned closer to the center of the impeller rotation axis than the forward wing portion. It was realized by doing.

An object of the present invention is to provide a blower fan that can achieve a performance equal to or higher than a conventional blower fan at a low rotational speed by obtaining a high air volume and a high static pressure, and can reduce noise that increases with the rotational speed. A flat casing, an upper inlet and a lower inlet formed in the upper wall and the bottom wall of the casing, an exhaust outlet formed in the side wall of the casing, an impeller disposed inside the casing, The impeller blade portion extends from the outer peripheral surface of the boss portion and is bent or bent in the direction opposite to the rotation direction of the impeller, and the impeller extends from the outer peripheral side end portion of the reverse wing portion via the inflection portion. And a forward wing portion that is curved or bent in the rotational direction, and the backward wing portion is located closer to the center of the rotation axis of the impeller than the forward wing portion.

  A first invention made to solve the above-described problem is an impeller of a centrifugal blower fan including a cylindrical boss portion and a plurality of blade portions extending radially from the outer peripheral surface of the boss portion. The blade portion extends from the outer peripheral surface of the boss portion and is bent or bent in the direction opposite to the rotation direction of the impeller, and extends from the outer peripheral side end portion of the reverse rotation blade portion via the inflection portion in the rotation direction of the impeller. A forward wing portion that is curved or bent, and the backward wing portion is positioned closer to the center of the impeller rotation axis than the forward wing portion.

  This configuration has the following effects.

  When pushing out the air to the outer peripheral side by the retreating wing part of the blade part, the retreating wing part curves or bends in the direction opposite to the rotation direction of the impeller, and the front surface of the retreating wing part pushing out the air is inclined to the outer peripheral side. The intake air can be efficiently sent toward the outer peripheral side, and the air volume can be increased.

  In addition, the forward wing is curved or bent in the direction of rotation of the impeller, and the front surface of the forward wing that pushes out the air is inclined toward the inner peripheral side. It can be pushed out strongly and the static pressure can be increased.

  Since the reverse wing and the forward wing are connected by a smooth inflection, the pressure loss when air is sent from the inner periphery to the outer periphery of the blade is small, and the reduction of air volume and static pressure is prevented. it can.

  Further, since the pressure loss when the sucked air is sent from the inner peripheral side to the outer peripheral side of the blade part is reduced, the vortex flow in the blade part is suppressed, and the noise generated with the rotation of the impeller can be reduced. .

  A second invention made to solve the above problems is the impeller according to the first invention, wherein the backward wing portion and the forward wing portion are formed symmetrically with the inflection portion as the symmetry center. Have.

  With this configuration, in addition to the operation of the first invention, the following operation is provided.

  Since the backward wing portion and the forward wing portion are formed symmetrically, the balance between intake and exhaust is good, the intake air can be efficiently sent to the outer peripheral side, and the supplied air can be efficiently and strongly pushed out.

  3rd invention made | formed in order to solve the said subject is an impeller as described in 1st or 2nd invention, Comprising: The ratio of the length of a backward wing | blade part and an advance wing | blade part is 1: 0.5-1. .5.

  With this configuration, in addition to the functions of the first or second invention, the following functions are provided.

  Depending on the opening diameter of the intake port and the outer diameter of the impeller, the size of the fan and impeller and the intake air can be changed by changing the length of the backward blade portion and the forward blade portion within a range of 1: 0.5 to 1.5. The balance between intake and exhaust can be adjusted appropriately according to the diameter and the size of the exhaust port, and the vortex flow during fan intake can be suppressed, turbulence noise due to intake can be reduced, and low noise Can be realized.

  In particular, by setting (the length of the forward wing portion) / (the length of the backward wing portion) to be 0.5 or more, the fed air can be pushed out efficiently and strongly. In addition, by setting (the length of the forward wing portion) / (the length of the backward wing portion) to 1.5 or less, the intake air can be efficiently sent to the outer periphery, and the vortex flow at the intake port is suppressed. The noise of the blower fan can be reduced, and a high air volume can be obtained.

  As (the length of the forward wing portion) / (the length of the backward wing portion) becomes smaller than 0.5, the air sent toward the outer peripheral side of the blade portion does not flow out properly in the direction of rotation of the impeller. On the other hand, there is a tendency that the force of strongly extruding to the outside tends to be impaired, and it becomes difficult to increase the static pressure, which is not preferable.

  Further, as (the length of the forward wing portion) / (the length of the backward wing portion) becomes larger than 1.5, the range in which the intake air is efficiently sent toward the outer peripheral side of the blade portion becomes shorter. Since it rises so as to be orthogonal to the rotation direction of the impeller within a range close to the inner diameter of the impeller, it is difficult to smoothly push out the air sucked into the outer peripheral portion of the blades to the outer peripheral side, which is not preferable.

  Further, if (the length of the forward wing portion) / (the length of the backward wing portion) exceeds 1.5, the amount of air that is sucked and pushed out to the outer peripheral side is larger than the air amount that is held on the front surface of the forward wing portion. Since it tends to decrease, it becomes difficult for air to flow out from the front surface of the forward wing portion. As a result, it is possible to obtain a force that strongly pushes the air outward, but there is an adverse effect of an increase in noise that is generated due to the eddy current generated when the air hardly flows out from the front surface of the forward wing part. This is not preferable from the viewpoint of low fan noise.

  A fourth invention made to solve the above-described problem is the impeller according to any one of the first to third inventions, wherein the virtual circle passes through the inflection portion about the rotation axis of the impeller. The angle formed by the tangent to the extension line of the outer peripheral end of the swept wing is 10 ° to 50 °.

  With this configuration, in addition to the operation of any one of the first to third inventions, the following operation is provided.

  The angle between the tangent line of the virtual circle passing through the inflection part and the extension line of the outer peripheral side end of the swept wing, that is, the exit angle of the swept wing is 10 ° to 50 °. It is possible to send out toward the outer peripheral side of the part, and it is possible to increase the intake efficiency.

  Here, as the exit angle of the receding wing part becomes smaller than 10 °, the receding wing part inclines so as to follow the rotation direction of the impeller, so that the force for pushing out the sucked air to the outer peripheral side becomes small. As the angle becomes larger than 0 °, the retracted blade portion rises so as to be orthogonal to the direction of rotation of the impeller, so that it becomes difficult to push out the sucked air smoothly to the outer peripheral side.

  A fifth invention made to solve the above-described problem is the impeller according to any one of the first to fourth inventions, wherein the outer peripheral side end of the forward wing portion is centered on the rotation axis of the impeller. The angle formed by the tangent line of the virtual circle passing through the part and the extension line of the outer peripheral side end portion of the forward wing portion is 55 ° to 110 °.

  With this configuration, in addition to the operation of any one of the first to fourth inventions, the following operation is provided.

  Since the angle formed by the tangent line of the imaginary circle passing through the outer peripheral end of the forward wing and the extended line of the outer peripheral end of the forward wing, ie, the exit angle of the forward wing is 55 ° to 110 °, the air It becomes difficult to flow out from the front surface of the forward wing portion, and the static pressure can be increased without impairing the force of strongly pushing air outward.

  Here, as the exit angle of the forward wing portion becomes smaller than 55 °, the air easily flows out from the front surface of the forward wing portion, the holding force of the air in the forward wing portion decreases, and as the outlet angle becomes larger than 110 °, the air advances. Since the outer peripheral side end of the wing is greatly curved or bent, the pressure loss increases and both the air volume and the static pressure decrease. In particular, in a centrifugal fan having a blade portion connected from a boss portion, when the inner wall of the casing is disposed in the vicinity of the tip of the blade forward blade portion, the pressure increases as the outlet angle of the forward blade portion becomes larger than 110 °. This is not preferable because the loss is remarkably increased and the air volume and static pressure are further reduced.

  A sixth invention made to solve the above-described problem is a blower fan, which is a flat casing, an intake port formed in at least one of the upper wall or the bottom wall of the casing, It has the structure provided with the exhaust port formed in the side wall, and the impeller as described in any one of the 1st thru | or 5th invention arrange | positioned inside the casing.

  This configuration has the following effects.

  Since the impeller has a reverse wing part and a forward wing part, the air sucked at the upper and lower intake ports can be efficiently and strongly sent out from the exhaust port, and high air volume and high static pressure can be obtained. It is possible to achieve the same or higher performance at a lower rotational speed than the conventional blower fan, and to reduce noise that increases with the rotational speed.

  Here, as a casing, what was formed in the flat box shape which has a bottom wall, an upper wall, and a side wall with metals, such as aluminum, synthetic resins, etc. is used. In addition, an air inlet is formed in a substantially circular shape or a polygonal shape around the rotation axis of the impeller on at least one of the upper wall or the bottom wall of the casing. A holding plate supported by a support member such as a rib extending from the peripheral portion is disposed in the central portion of the lower intake port or the upper intake port, and a drive unit such as a circuit board, a stator, or a shaft support portion is provided on the holding plate. It is mounted and the impeller is pivotally supported by the pivotal support.

  7th invention made | formed in order to solve the said subject is a ventilation fan as described in 6th invention, Comprising: An upper inlet and / or a lower inlet are formed in substantially circle shape, The peripheral part is an impeller It has the structure formed so that it might be located in the vicinity of the inflection part.

  With this configuration, in addition to the operation of the sixth invention, the following operation is provided.

  Since the peripheral part of the substantially circular upper air inlet and / or lower air inlet is located in the vicinity of the inflection part of the impeller, the air introduced into the casing from the upper air inlet and / or the lower air inlet is moved backward by the wing part. Can be sent out more efficiently.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1A is a plan view of an impeller according to Embodiment 1 of the present invention, and FIG. 1B is a schematic plan view of an impeller for explaining the entrance angle and the exit angle of the receding wing part and the advancing wing part. It is.

  In FIG. 1, 1 is an impeller according to Embodiment 1 of the present invention, 2 is a cylindrical boss portion, 2 a is a rotating shaft fixed to the center of the lower surface of the top surface portion 2 b of the boss portion 2, and 3 is a boss portion 2. A plurality of blade portions extending radially from the outer peripheral surface, 4 extends from the outer peripheral surface of the boss portion 2, and the retreat wing portion of the blade portion 3 curved in the direction opposite to the rotation direction X of the impeller 1, 5 is the outer periphery side of the retreat wing portion 4 The forward wing portion extending from the end portion and curved in the rotation direction X of the impeller 1, 6 is a bending portion which is a portion of the blade portion 3 that changes from the backward wing portion 4 to the forward wing portion 5, and β 1 is the inlet of the backward wing portion 4. The angle β2 is the exit angle of the forward wing portion 5, and β3 is the exit angle of the backward wing portion 4 and the entrance angle of the forward wing portion 5.

  Here, the retreat wing part 4 and the advance wing part 5 of each blade part 3 are formed on an arc having the same length and the same radius of curvature, and are symmetrical with respect to the inflection part 6 as a center of symmetry. Is formed.

  Further, the inlet angle β1 of the swept wing part 4 is the tangent to the outer peripheral surface of the boss part 2 at the connecting portion 6a between the swept wing part 4 and the outer peripheral surface of the boss part 2, and the inner peripheral side end of the swept wing part 4. Is an angle taken from the tangent to the rotational direction on the outer diameter side of the tangent. The exit angle β2 of the forward blade portion 5 is an angle formed by a tangent line of an imaginary circle centering on the rotation shaft 2a at the outer peripheral side end portion of the forward blade portion 5 and an extension line of the outer peripheral side end portion of the forward blade portion 5. It is an angle taken from the tangent in the rotational direction on the outer diameter side of the tangent. The exit angle β3 of the swept wing part 4 is the outer diameter of the angle formed by the tangent line of the imaginary circle centering on the rotation axis 2a in the inflection part 6 and the extension line of the outer peripheral side end part of the swept wing part 4. The angle taken from the tangent to the direction of rotation on the side. The backward wing portion 4 and the forward wing portion 5 are connected by a smooth inflection portion 6. That is, the exit angle β3 of the receding wing part 4 is the same as the entrance angle of the advancing wing part 5. The inlet angle β3 of the forward blade portion 5 is an angle formed with the inner peripheral side end portion of the forward blade portion 5 with respect to a tangent of a virtual circle centering on the rotation axis 2a in the inflection portion 6.

  Each blade portion 3 is formed such that the outlet angle β2 of the forward blade portion 5 is 55 ° to 110 °, and the outlet angle (inlet angle of the forward blade portion 5) β3 of the backward blade portion 4 is 10 ° to 50 °. Has been.

  Further, the ratio of the length of the backward wing portion and the forward wing portion is formed to be 1: 0.5 to 1.5.

  A blower fan provided with impeller 1 according to Embodiment 1 of the present invention configured as described above will be described with reference to FIGS. 2 and 3.

  FIG. 2A is a perspective view of a main part of the blower fan according to Embodiment 1 of the present invention, and FIG. 2B is an internal perspective plan view of the blower fan according to Embodiment 1 of the present invention. (C) is a central cross-sectional view of the blower fan of FIG. 2 (b), and FIG. 3 is an enlarged plan view of the main part of the impeller 1.

  In the figure, 10 is a blower fan according to the first embodiment of the present invention, 11 is a casing having a bottom wall 11a and a side wall 11b, 11c is an inner peripheral surface of the side wall 11b, and 12 is a casing covered on the upper surface of the casing 11. 11 is a casing cover forming the upper wall of the casing 11, 13 is a circular lower inlet formed at the center of the bottom wall 11a of the casing 11, 14 is a circular upper inlet formed at the center of the casing cover 12, Is a rectangular exhaust port formed in a predetermined portion of the side wall 11 b of the casing 11, 16 is a holding plate supported by a support member (not shown) at a substantially central portion of the lower intake port 13, and 17 is an upper surface of the holding plate 16. A bearing portion that is fixedly installed on the impeller 1 and rotatably supports the rotating shaft 2a of the impeller 1, 18 is a stator around which a coil fixed around the bearing portion 17 is wound, and 19 is opposed to the stator 18. The inner peripheral surface to the mating fixed cylindrical magnet boss portion 2, 20 is a circuit board which is arranged in a lower portion of the stator 18.

  Here, the inner peripheral surface 11 c of the casing 11 is formed in a substantially circular shape except for the exhaust port 15. The exhaust port 15 may be formed by opening one side of the side wall 11b, or may be formed by opening a part of one side.

  Further, the upper air inlet 14 and the lower air inlet 13 are formed with such diameters that their peripheral portions are located in the vicinity of the inflection portion 6 of the impeller 1.

  Operation of the impeller 1 and the blower fan 10 according to Embodiment 1 of the present invention configured as described above will be described below with reference to the drawings.

  When electric power is supplied to the circuit board 20, current flows through each coil wound around the stator 18, and magnetic force is generated in the stator 18. The cylindrical magnet 19 is alternately magnetized with N and S poles in the circumferential direction, and the impeller 1 rotates by attracting the magnetic force generated in the stator 18. At this time, a Hall element (not shown) mounted on the circuit board 20 detects the N pole and S pole of the cylindrical magnet 19 and generates an output signal. By controlling the current flowing through each coil to be commutated by the output signal of the Hall element, the magnetic poles of the magnetic force generated in the stator 18 are successively changed and attracted to the N pole and S pole of the cylindrical magnet 19. It rotates continuously in a predetermined rotation direction X. As the impeller 1 rotates, outside air is sucked from the lower air inlet 13 and the upper air inlet 14.

  As shown in FIG. 3, the outside air sucked into the casing 11 is pushed out to the outer peripheral side by the retreating wing part 4 on the inner peripheral side of the blade part 3. At this time, the retreat wing part 4 is curved in the direction opposite to the rotation direction X of the impeller 1, and the front surface of the retreat wing part 4 that pushes out air is inclined toward the outer peripheral side. Thereby, the inhaled air can be efficiently sent in the centrifugal direction toward the outer peripheral side. The air sent to the outer peripheral side is pushed out by the forward wing part 5 on the outer peripheral side of the blade part 3 to the outside of the blade part 3, that is, between the outer peripheral side end part of the blade part 3 and the inner peripheral surface 11c of the casing 11. . At this time, the forward blade portion 5 is curved in the rotation direction X of the impeller 1, and the front surface of the forward blade portion 5 that pushes out the air is inclined toward the inner peripheral side. Thereby, it becomes difficult for air to flow out from the front surface of the forward wing portion 5, and the blade portion 3 can strongly push the air outward.

  Next, the fan performance of the blower fan according to Embodiment 1 of the present invention will be described with reference to FIGS.

  FIG. 4 is an air flow static pressure characteristic curve diagram showing the relationship between the air flow and static pressure of the blower fan according to the embodiment of the present invention and the conventional blower fan, and FIG. 5 is a diagram of the blower fan according to the first embodiment of the present invention. FIG. 6 is a correlation diagram showing a change in static pressure when the exit angle β3 of the swept wing part is changed, and FIG. 6 is a diagram when the exit angle β2 of the advancing wing part of the blower fan according to Embodiment 1 of the present invention is changed. FIG. 7 is a correlation diagram showing changes in the static pressure of the fan, and FIG. 7 shows changes in the static pressure when the ratio of the length of the backward blade portion and the length of the forward blade portion of the blower fan according to Embodiment 1 of the present invention is changed. FIG.

  In FIG. 4, A is the air volume static pressure characteristic curve of the blower fan according to Embodiment 1 of the present invention, and B is the air volume static pressure characteristic curve of the conventional fan. Here, as a conventional blower fan, a linear blade portion was used as the blade portion of the impeller. The inlet angle of the straight blade portion is the same as the inlet angle of the swept wing portion 4 of the impeller of the first embodiment, and the outer diameter (the linear distance from the impeller rotating shaft to the outer peripheral end of the blade portion) is also the same. It was. The other structure of the conventional blower fan is the same as that of the first embodiment, and the rotational speed of the impeller is about 3500 r / min, which is substantially the same.

In FIG. 5, A1 shows the change of the static pressure when changing the exit angle β3 of the backward blade portion 4 of the blower fan 10 of Embodiment 1 of the present invention. The exit angle β2 of the forward blade portion 5 of the blade portion 3 was fixed at 100 °, the rotation speed of the impeller 1 was about 3500 r / min, and the air volume was 50 L / min.

  In FIG. 6, A2 shows the change of the static pressure when the exit angle β2 of the forward blade portion 5 of the blower fan 10 according to the first embodiment of the present invention is changed. In addition, the exit angle β3 of the backward blade portion 4 of the blade portion 3 was fixed at 40 °. The rotation speed and air volume of the impeller 1 were the same as those in FIG.

  In FIG. 7, A3 shows a change in static pressure when the ratio of the length of the forward blade portion 5 and the length of the backward blade portion 4 of the blower fan 10 according to the first embodiment of the present invention is changed. In addition, the exit angle β3 of the forward blade portion 5 of the first embodiment is fixed at 40 °, and the outlet angle β2 of the backward blade portion 4 is fixed at 100 °. The rotation speed and air volume of the impeller 1 were the same as those in FIG.

  As shown in FIG. 4, the air blowing fan 10 of the first embodiment has a higher air volume and static pressure than the conventional air blowing fan because the blade portion 3 has the backward blade portion 4 and the forward blade portion 5. It was found that a high air volume and a high static pressure can be generated even if the rotation speed of the impeller is the same. From this result, it is clear that the fan fan 10 of the first embodiment can obtain fan performance equivalent to that of the conventional fan even if the rotational speed of the impeller is lowered. Usually, noise generated when the fan is driven Therefore, according to the first embodiment, it has been found that noise can be reduced while obtaining fan performance equivalent to that of the prior art.

  Further, as shown in FIG. 5, by forming the exit angle β3 of the swept wing part 4 at 10 ° to 50 °, the intake air can be efficiently sent toward the outer peripheral side of the blade part 3, It was found that the intake efficiency can be increased and the static pressure can be increased when the airflow is constant.

  Moreover, as shown in FIG. 6, since the exit angle β2 of the forward blade portion 5 is formed at 55 ° to 110 °, it is difficult for the fed air to flow out from the front surface of the forward blade portion 5, and the air volume is constant. It was found that the static pressure can be increased when

  Further, as shown in FIG. 7, the ratio of the blade lengths of the backward blade portion 4 and the forward blade portion 5 is formed at 1: 0.5 to 1.5, so that the balance between intake and exhaust is good. The intake air can be efficiently sent in the centrifugal direction toward the outer peripheral side, and the air sent to the outer peripheral side can be pushed out efficiently and strongly, so that the static pressure can be increased when the air volume is constant. I knew it was possible.

  Further, with respect to the conventional blower fan having the linear blade portion as described above, under the same conditions as in the case of FIGS. 5 to 7 (the rotation speed of the impeller 1: about 3500 r / min, the air volume: 50 L / min) When the static pressure was measured, it was 15 Pa. From this result, in the blower fan 10 according to Embodiment 1 of the present invention, the exit angle β3 of the receding wing portion 4 is set to 10 ° to 50 °, or the exit angle β2 of the forward wing portion 5 is set to 55 ° to By setting it to 110 °, or by setting the ratio of the blade lengths of the backward wing portion 4 and the forward wing portion 5 to 1: 0.5 to 1.5, all generate static pressure of about 17 Pa or more. It has been found that the static pressure can be increased by about 10% or more compared with the prior art, and the fan performance is remarkably excellent.

  As described above, the impeller 1 and the blower fan 10 including the impeller 1 according to Embodiment 1 of the present invention are configured, and thus have the following operations.

Since the retreating wing part 4 is curved in the direction opposite to the rotation direction X of the impeller 1 and the front surface of the retreating wing part 4 for pushing out air is inclined toward the outer peripheral side, the sucked air is efficiently directed toward the outer peripheral side. It can be sent out and the air volume can be increased. Further, since the forward blade portion 5 is curved in the rotation direction X of the impeller 1 and the front surface of the forward blade portion 5 that pushes out the air is inclined toward the inner peripheral side, the air flows out from the front surface of the forward blade portion 5. It becomes difficult, the air can be strongly pushed outward, and the static pressure can be increased.

  Since the backward wing portion 4 and the forward wing portion 5 are connected by the smooth inflection portion 6, the pressure loss when air is sent from the inner peripheral side to the outer peripheral side of the blade portion 3 is small, and the air volume and static pressure are reduced. Can be prevented.

  Since the backward wing portion 4 and the forward wing portion 5 are formed symmetrically with the inflection portion 6 as the center of symmetry, the balance between the intake air and the exhaust air is good, and the intake air is efficiently sent to the outer peripheral side. Can be pushed out efficiently and strongly.

  Since the impeller 1 has the retreating wing part 4 and the advancing wing part 5, the air sucked in the upper intake port 14 and the lower intake port 13 can be efficiently and strongly sent out and exhausted from the exhaust port 15 to the outside. In addition, a high static pressure can be obtained, the same or higher performance can be realized at a lower rotational speed than that of a conventional blower fan, and noise that increases with the rotational speed can be reduced.

  Since the peripheral portions of the substantially circular upper air inlet 14 and lower air inlet 13 are located in the vicinity of the inflection portion 6 of the impeller 1, the air introduced into the casing 11 is efficiently moved to the outer peripheral side by the receding blade portion 4. It can be sent out and the intake efficiency can be increased.

  The present invention relates to an impeller used for a centrifugal blower fan. In particular, according to the present invention, the intake air is efficiently sent out in the centrifugal direction on the inner peripheral side of the blade portion to increase the intake efficiency and obtain a high air volume. In addition, it is possible to provide an impeller that can obtain a high static pressure by appropriately suppressing the outflow of air from the surface of the blade portion on the outer peripheral side of the blade portion.

  The present invention relates to a centrifugal blower fan, and in particular, according to the present invention, by obtaining a high air volume and a high static pressure, the same or higher performance can be realized at a lower rotational speed than a conventional blower fan, and the rotational speed. Also, it is possible to provide a blower fan that can reduce noise that increases.

(A) The top view of the impeller in Embodiment 1 of this invention, (b) The schematic top view of the impeller for demonstrating the entrance angle and exit angle of a retreat wing | blade part and an advance wing | blade part (A) The principal part perspective view of the ventilation fan in Embodiment 1 of this invention, (b) The internal perspective top view of the ventilation fan in Embodiment 1 of this invention, (c) Of the ventilation fan of FIG.2 (b) Center cross section Main part enlarged plan view of impeller Air flow static pressure characteristic curve diagram showing the relationship between air flow and static pressure of the blower fan of the embodiment of the present invention and the conventional blower fan Correlation diagram showing changes in static pressure when outlet angle β3 of the swept wing part of the blower fan according to the first embodiment of the present invention is changed. Correlation diagram showing changes in static pressure when outlet angle β2 of the forward blade portion of the blower fan according to Embodiment 1 of the present invention is changed. The correlation diagram which shows the change of the static pressure when changing the ratio of the length of the backward wing | blade part of the ventilation fan of Embodiment 1 of this invention, and the length of an advance wing | blade part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Impeller 2 Boss part 2a Rotating shaft 2b Top surface part 3 Blade part 4 Backward wing part 5 Forward wing part 6 Inflection part 6a Connection part 10 Blower fan 11 Casing 11a Bottom wall 11b Side wall 11c Inner peripheral surface 12 Casing cover (casing upper wall) )
13 Lower intake port 14 Upper intake port 15 Exhaust port 16 Holding plate 17 Bearing portion 18 Stator 19 Cylindrical magnet 20 Circuit board X Rotating direction of impeller β1 Inlet angle of retracted blade portion β2 Outlet angle of forward blade portion β3 Inverted blade portion Exit angle (advance angle of forward wing)

Claims (7)

A centrifugal blast fan impeller comprising a cylindrical boss portion and a plurality of blade portions extending radially from the outer peripheral surface of the boss portion,
The blade portion extends from the outer peripheral surface of the boss portion and is bent or bent in a direction opposite to the rotation direction of the impeller, and the impeller rotates from the outer peripheral side end portion of the reverse blade portion via the inflection portion. And an advancing wing portion curved or bent in a direction, wherein the advancing wing portion is located closer to a rotation shaft center side of the impeller than the advancing wing portion. 2. The impeller according to claim 1, wherein the backward wing portion and the forward wing portion are formed symmetrically with the inflection portion as a center of symmetry. The impeller according to claim 1 or 2, wherein a ratio of a length of the backward wing portion and the forward wing portion is 1: 0.5 to 1.5. 2. An angle formed by a tangent line of an imaginary circle passing through the inflection portion with the rotation axis of the impeller as a center and an extension line of an outer peripheral side end portion of the swept wing portion is 10 ° to 50 °. 4. The impeller according to any one of items 3 to 3. An angle formed by a tangent line of an imaginary circle passing through the outer peripheral side end of the forward wing portion and the extension line of the outer peripheral side end of the forward wing portion is 55 ° to 110 ° with the impeller rotating shaft as a center. The impeller according to any one of claims 1 to 4. A flat casing, an intake port formed in at least one of an upper wall or a bottom wall of the casing, an exhaust port formed in a side wall of the casing, and an inside of the casing. An air blower comprising the impeller according to any one of Items 1 to 5. The intake port formed in at least one of the upper wall or the bottom wall of the casing is formed in a substantially circular shape, and the peripheral edge thereof is formed in the vicinity of the inflection portion of the impeller. The blower fan according to claim 6, wherein

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