JP2013160190A - Electric fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric fan in which an air blowing range is expanded while securing energy saving performance by reducing power consumption, in an electric fan used for decreasing a sensible temperature by direct wind or for circulating indoor air.SOLUTION: A pair of sheets 4 which are confronted while being supported by an impeller guard 3 and a winding means 5 are provided at an outer circumferential side of an impeller 1. Therefore, since a swirling flow around a rotational axis is destroyed and an air flow is thrown to a position away from the rotational axis. Thus, since the swirling flow generated from the impeller 1 is separated by the sheets 4, axial power required for the impeller 1 is reduced. On the other hand, since a blown air-flow of the electric fan becomes an elliptical wide air flow with positions of the sheets 4 as a shorter diameter, an air blowing range can be expanded into an arbitrary range while securing energy saving performance by reducing power consumption.

Description

  The present invention relates to a fan that is used for reducing the temperature of sensation due to direct wind and circulating indoor air.

  Conventionally, this type of electric fan is known to have a structure that widens the airflow with a characteristic blade shape (see, for example, Patent Document 1).

  Hereinafter, the electric fan will be described with reference to FIGS. 11 and 12.

  As shown in FIGS. 11 and 12, a twisted plate having an arbitrary size and a gentle curved surface radially from the blade support shaft cylinder 101 and on the outer peripheral portion of the front surface of the blade on the rear side with respect to the rotation direction of the blade 102. 103 is provided. When the airflow generated by the rotation of the blades 102 collides with the whirling plate 103, the airflow having a change in a wider range can be sent by moving while greatly rotating in the rotation direction of the blades 102.

  In addition, some fans of this type are provided with guide vanes at the rear stage of the blades to widen the airflow (see, for example, Patent Document 2).

  Hereinafter, the electric fan will be described with reference to FIG.

  As shown in FIG. 13, the motor 104 for rotating the fan blades 102, the rotating shaft 105 for transmitting the power of the motor 104 to the blades, the rear guard 106 for covering the blades, and the front guard 107 are divided into front guards. Reference numeral 107 includes a guide vane 108 that changes the blowing direction, and the front guard is rotated by a small motor 109. Moreover, it is comprised from the support pillar 110 which supports the front guard 107 of a fan, and the support stand 112 which supports the ventilation part 111 of a fan.

  With this configuration, by rotating the front guard 107 provided with the guide vanes 108, the wind can be changed in a wide range of left, right, up and down.

JP-A-8-121392 JP 62-20696 JP

  In the conventional electric fan as in Patent Document 1, since the swirl plate 103 is greatly inclined to the pressure surface side, there is a problem that the shaft power necessary to rotate the blades 102 increases and the power consumption increases. It was.

  Moreover, in the conventional electric fan like patent document 2, if the guide blade 108 is installed in the back | latter stage of the blade | wing 102, the static pressure concerning the blade | wing 102 will rise. Since the axial flow type blade 102 used in the electric fan cannot generally take a large static pressure, the installation of the guide blade 108 that increases the static pressure of the blade 102 causes a decrease in the wind speed. There was a problem that the power consumption was increased by reducing the efficiency.

  Then, this invention solves the said conventional subject, and it aims at providing the electric fan which expands a ventilation range, without increasing power consumption.

  In order to achieve this object, the present invention provides an electric fan that includes an impeller, an electric motor that drives the impeller, and an impeller guard that covers the impeller. At least one pair of facing sheets covering a part of the outer periphery of the guard, and a winding means capable of winding the sheet in the circumferential direction of the impeller, thereby providing To achieve this goal.

  According to the present invention, an electric fan including an impeller, an electric motor that drives the impeller, and an impeller guard that covers the impeller, is supported by the impeller guard and covers a part of the outer periphery of the impeller guard. When the impeller rotates and crosses the sheet, the blades are provided with at least one pair of opposed sheets and winding means capable of winding the sheets in the circumferential direction of the impeller. The airflow increased in pressure on the outer periphery side of the vehicle collides with the seat, and the swirl component of the airflow is reduced, so that the swirl flow centered on the rotation axis is collapsed, and the airflow is discharged to a position away from the rotation axis. Thereby, since the swirl | vortex flow produced from an impeller is cut | disconnected by a sheet | seat, the blowing airflow of an electric fan becomes the elliptical wide airflow which made the sheet | seat position the short diameter, and it can acquire the effect that the ventilation range is expanded.

  Further, since the shaft power necessary for the rotation of the impeller is reduced by separating the swirling flow by the seat, it is possible to obtain an effect of reducing power consumption and improving energy saving performance.

  Furthermore, since the user can change the length of the sheet, an effect that the air blowing range can be arbitrarily determined is obtained.

The perspective view which shows the electric fan of Embodiment 1 of this invention. The top view which shows the electric fan of Embodiment 1 of this invention (A) is a perspective view showing the sheet and the winding means in a state where the sheet is wound, and (b) is a perspective view showing the sheet and the winding means in a state where the sheet is pulled out. The perspective view which shows the electric fan of Embodiment 1 of this invention. (A) is a perspective view which shows the flow of the airflow of the fan without a sheet | seat, (b) is the perspective view which shows the flow of the airflow of the fan of Embodiment 1 of this invention. The perspective view which shows the electric fan of Embodiment 2 of this invention. The front view which shows the electric fan of Embodiment 2 of this invention The perspective view which shows the electric fan of Embodiment 3 of this invention. The perspective view which shows the electric fan of Embodiment 4 of this invention. The perspective view which shows the electric fan of Embodiment 5 of this invention. Front view showing the blades of a conventional fan AA sectional view of the blade shown in FIG. Cross-sectional view of main parts showing a conventional electric fan

  The electric fan according to claim 1 of the present invention is an electric fan including an impeller, an electric motor that drives the impeller, and an impeller guard that covers the impeller, and is supported by the impeller guard and the impeller guard. And at least one pair of opposed sheets covering a part of the outer periphery of the sheet, and a winding means capable of winding the sheet in the circumferential direction of the impeller.

  As a result, when the impeller rotates and crosses the seat, the air flow boosted on the outer peripheral side of the impeller collides with the seat and the swirl component of the air flow decreases, so that the swirl flow around the rotation axis is disrupted. Since the airflow is discharged to a position away from the rotating shaft, the swirl flow generated from the impeller is separated by the sheet, so that the axial power required for the impeller is reduced, while the blowout airflow of the fan has a short diameter at the seat position. Therefore, the air flow range is expanded while reducing power consumption and ensuring energy saving.

  Furthermore, since the user can change the length of the seat, the air blowing range can be arbitrarily determined.

  Further, the winding means may be configured to automatically wind. Thereby, since the storage of the sheet is automatic, there is an effect that the airflow can be easily switched.

  In addition, two pairs of the sheet and the winding unit may be provided at opposing positions. Accordingly, it is possible to switch between a state where the upper and lower sides of the impeller guard are covered, a state where the left and right sides are covered, and a state where the impeller guard is not covered. Thus, there is an effect that three types of airflow can be switched.

  The sheet may be provided with winding means capable of pulling the sheet to either the left or right in the circumferential direction of the impeller. Thereby, since the sheet drawing direction is not restricted, there is an effect that it is possible to switch between three types of air currents with the pair of sheets and the winding means.

  Moreover, you may make it the structure provided with the rotation means which makes a pair of said sheet | seat and the said winding means rotatable. Thereby, since it becomes possible to determine the said sheet | seat as arbitrary arrangement | positioning of a user, there exists an effect that the freedom degree of airflow increases and a user's comfort improves.

  The sheet may include an opening, and the winding means may be provided on both sides of the sheet. Thereby, by adjusting the winding amount of the sheet, it is possible to switch between the opening and the other than the opening, and the sheet can be automatically pulled out, so that the airflow is automatically switched. There is an effect that becomes possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 and 2, the electric fan of the present embodiment has an impeller 1, an electric motor 2 that drives the impeller 1, and an impeller guard 3 that covers the impeller 1. The impeller 1 includes at least one pair of opposed sheets 4 that are supported by each other and covers a part of the outer periphery of the impeller guard 3, and winding means 5 that can wind the sheet 4 in the circumferential direction of the impeller 1. It is provided on the outer peripheral side. The seat 4 is fixed along the outer periphery of the impeller guard 3.

  In FIG. 1 and FIG. 2, the seat 4 is disposed to face the upper side and the lower side of the outer periphery of the impeller 1. In the present embodiment, as an example, the impeller 1 has a diameter of 30 cm, the impeller guard 3 is made of metal, and the outer diameter of the impeller guard 3 is 37 cm.

  FIG. 3A shows the sheet 4 and the winding means 5 in a state where the sheet 4 of the present embodiment is wound, and FIG. 3B shows the sheet 4 and the winding means 5 in a state where the sheet 4 is pulled out. Show. The sheet 4 is provided with an attachment / detachment portion 6 that enables attachment / detachment to / from the impeller guard 3 at the tip pulled out from the winding means 5. In this embodiment, as an example, the portion covered with the seat 4 is set to 32 cm along the impeller guard 3.

  Further, the ratio of the impeller guard 3 covered with one seat 4 is, for example, 34% of the circumferential length of the impeller guard 3, but is preferably in the range of 20 to 45%. The numerical value is determined in relation to the range that expands the airflow. Furthermore, the length of the sheet 4 in the short direction is, for example, 1.9 times the length of the impeller 1 in the thickness direction, but is desirably in the range of 1 to 3 times.

  The material of the sheet 4 may be any material that is flexible and can withstand an assumed tensile load, such as polyethylene, glass fiber, and steel, and does not allow air to pass therethrough.

  Further, the shape of the sheet 4 may have an opening as long as it can block the wind, and the same effect can be obtained although the effect is inferior.

  The winding means 5 can be fixed to the metal impeller guard 3 by a magnetic force. As other fixing means, a resin claw may be provided and fixed to the guard, or may be fixed with a screw.

  The winding means 5 can automatically wind the sheet 4. As a winding means, a mainspring is provided inside, and the mainspring is deformed when the sheet 4 is pulled out, and the sheet 4 is wound up by using a return force. As another automatic winding method, the sheet may be wound using a driving device such as a motor. When winding manually, a mechanism may be adopted in which a lever is attached to wind up.

  The attaching / detaching portion 6 is a magnet that is fixed to the metal impeller guard 3 by a magnetic force and is attachable / detachable. As another fixing method, a resin claw may be provided on the attachment / detachment portion 6 and attached to / detached from the impeller guard 3.

  FIG. 4 shows a fan in which the sheet 4 arranged facing the upper and lower sides of the outer periphery of the impeller 1 shown in FIGS. 1 and 2 is arranged facing the left side and the right side of the outer periphery of the impeller 1.

  Next, the operation of the first embodiment will be described.

  In FIG. 5, the figure which compared the flow of the airflow of the electric fan without the sheet | seat 4 and the electric fan of this Embodiment is shown. The arrows in the figure indicate the flow of airflow.

  As shown in FIG. 5A, the airflow of the fan without the seat 4 flows linearly while turning around the rotation axis of the electric motor 2. On the other hand, as shown in FIG. 5B, in the electric fan of the present embodiment in which the seat 4 is disposed so as to face the upper side and the lower side, when the impeller 1 rotates and crosses the seat 4, the impeller 1 The airflow increased in pressure on the outer peripheral side collides with the seat 4 and the swirl component of the airflow is reduced, so that the swirl flow centered on the rotation axis is collapsed, and the airflow is discharged to a position away from the rotation axis. As a result, the swirl flow generated from the impeller 1 is separated by the seat 4, so that the axial power required for the impeller 1 is reduced, while the blowout airflow of the fan is an elliptical wide airflow with the position of the seat 4 as the short diameter It becomes.

  Thus, according to the electric fan of Embodiment 1 of this invention, since power consumption reduces by reducing shaft power, the ventilation range can be expanded, ensuring energy saving. In FIG.5 (b), since the sheet | seat 4 is facing the upper side and the lower side, it becomes a wide air current in the horizontal direction, for example, when several people are located in a line, an air current can be simultaneously sent with respect to several people.

  Further, when the seat 4 is opposed to the left side and the right side, the air current is wide in the vertical direction, so that air can be uniformly blown from the head to the feet. In general, it is known that comfort is improved when a uniform wind speed is applied rather than applying a biased wind speed to each part of the body. Comfort can be improved.

  Further, since the user can adjust the portion covering the impeller guard 3 by the length of the sheet 4 drawn (the appropriate range of the ratio of the impeller guard 3 covered by the seat 4 described above is displayed on the seat 4), the user can The extent of spread can be determined arbitrarily.

(Embodiment 2)
As shown in FIGS. 6 and 7, the electric fan according to the present embodiment is provided with two pairs of sheets 4 that are opposed to each other and that have winding means 5. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  6 and 7, the sheet 4 and the winding means 5 are disposed so as to face the vertical direction and the horizontal direction of the outer periphery of the impeller 1.

  In the above configuration, when only the seat 4 arranged opposite to the vertical direction of the outer periphery of the impeller 1 is pulled out, a wide air current spreading in the horizontal direction is obtained. is there.

  In addition, when only the seat 4 arranged facing the left and right direction on the outer periphery of the impeller 1 is pulled out, it becomes a wide air current spreading in the vertical direction, which is effective when the whole body is exposed to wind such as after taking a bath. is there.

  Moreover, by winding all the sheets 4 with the winding means 5, it can be set as standard airflow, and can switch easily three types of airflow.

(Embodiment 3)
As shown in FIG. 8, the electric fan of the present embodiment winds a pair of opposed sheets 24, winding means 25 provided with a drawing port of the sheet 24 on the outer peripheral side, and a presser 26 for pressing the sheet 24. The take-up means 25 is provided on both the left and right sides of the impeller 1 circumferential direction.

  The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the above configuration, the seat 24 can be pulled out to the left or right side in the circumferential direction of the impeller 1, and the seat 24 and the impeller guard 3 can be moved by passing the seat 24 between the presser 26 and the impeller guard 3. Since the gap can be reduced and the leakage of wind can be suppressed, the three types of airflow can be switched only by the pair of facing sheets 24 and the winding means 25.

  In the third embodiment, the winding means 25 is fixed and the sheet 24 can be pulled out to the left and right. However, the winding means 25 may be rotatably supported with the winding axis as a rotation axis. There is no difference in the effects.

(Embodiment 4)
As shown in FIG. 9, the electric fan according to the present embodiment includes a pair of facing sheets 34, a winding means 35, and a groove 36 concentric with the impeller 1 that makes one round of the impeller guard 3. The winding means 35 is provided with a convex portion 37 so as to be fitted with 36, and the sheet 34 and the winding means 35 are installed so as to be movable along the groove 36.

  The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the above configuration, the sheet 34 and the winding means 35 are movable along the groove 36 and can be fixed at any position of the user, so that the wide airflow can be spread to any angle other than vertical and horizontal. . In addition, since the amount by which the seat 34 is pulled out can be adjusted, the range in which the air current spreads can also be adjusted, and the comfort of the user is improved by increasing the degree of freedom of the air current. Although the impeller guard 3 is provided with the groove 36 and the sheet 34 and the winding means 35 are moved, the winding means 35 is fixed to the impeller guard 3 and the impeller guard 3 is rotated on the rotating shaft of the impeller 1. You may rotate as an axis | shaft and it does not produce a difference in the effect.

(Embodiment 5)
As shown in FIG. 10, the electric fan according to the present embodiment includes at least one pair of sheets 44 facing each other, winding means 45 on both sides of the sheet 44, and an opening 46 in the sheet 44.

  The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 10, the sheet | seat 44 provided with two pairs of opening parts 46 with which the outer periphery of the impeller 1 was provided facing up and down, right and left, and the winding means 45 are shown.

  In the above configuration, since the opening portion 46 is provided in the seat 44, when covering the impeller guard 3, the opening portion 46 is accommodated in the winding means 45, and only the portion other than the opening portion 46 is drawn out, and the blade When the car guard 3 is not covered, a portion other than the opening 46 is accommodated in the winding means 45 and only the opening 46 is pulled out, so that the impeller guard 3 is covered or switched when not covered. Can do.

  Further, since the winding means 45 is provided on both sides of the sheet 44, when the one winding means 45 takes up the sheet 44, the sheet 44 is pulled out from the other winding means 45, so that the sheet 44 is automatically pulled out. It becomes possible to do. Thereby, a wide air current in the vertical direction, a wide air current in the horizontal direction, and a standard air current can be automatically switched.

  In the fifth embodiment, the two pairs of sheets 44 and the winding means 45 facing each other are provided. However, the pair of sheets 44 and the winding means 45 facing each other can be rotated about the rotation axis of the impeller 1. However, there is no difference in the effect.

  The electric fan according to the present invention includes a pair of opposed sheets 4 supported by the impeller guard 3 on the outer peripheral side of the impeller 1, so that the swirl flow generated from the impeller 1 is separated by the sheet 4. For this reason, while the shaft power required for the impeller 1 is reduced, the blown airflow of the electric fan becomes an elliptical wide airflow with the position of the seat 4 as the short diameter, thus reducing power consumption and ensuring energy saving. The air blowing range can be expanded to an arbitrary range, and utilization as a fan for home use or office use is expected.

DESCRIPTION OF SYMBOLS 1 Impeller 2 Electric motor 3 Impeller guard 4 Sheet 5 Winding means 6 Detachable part 24 Sheet 25 Winding means 26 Presser 34 Sheet 35 Winding means 36 Groove 37 Convex part 44 Sheet 45 Winding means 46 Opening part

Claims (6)

An electric fan including an impeller, an electric motor that drives the impeller, and an impeller guard that covers the impeller;
At least one pair of opposed sheets supported by the impeller guard and covering a part of the outer periphery of the impeller guard, and winding means capable of winding the sheet in the circumferential direction of the impeller. A fan characterized by The electric fan according to claim 1, wherein the winding means automatically winds up. The electric fan according to claim 1 or 2, wherein two pairs of the sheet and the winding means are provided at positions facing each other. The electric fan according to claim 1 or 2, further comprising winding means capable of pulling out the sheet to either the left or right in the circumferential direction of the impeller. The electric fan according to claim 1 or 2, further comprising a rotating unit that allows the pair of sheets and the winding unit to rotate on a concentric circle of the impeller. 6. The electric fan according to claim 2, wherein the sheet includes an opening, and the winding unit is provided on both sides of the sheet.

Images