JP4861289B2 - Fan unit for air conditioner - Google Patents

Description

  The present invention relates to a fan unit used for an outdoor unit, an indoor unit, an exhaust fan unit, and the like of an air conditioner.

  A filter device provided in a conventional indoor unit of an air conditioner is provided with an air filter for preventing dust from entering the inside of the main body of the air conditioner on the front surface of the heat exchanger. Is configured to be detachable so that attached dust can be cleaned by hand. The filter device having such a configuration not only requires frequent maintenance, but also gradually clogs the air filter until the maintenance is performed, and as a result, the amount of air passing through the heat exchanger decreases. As a result, the air conditioning capability is reduced, leading to an increase in power consumption.

For this reason, in order to reduce the maintenance work of the air filter, an automatic cleaning device has been proposed in which dust adhering to the air filter is sucked and cleaned by the dust suction device through the suction nozzle, and the sucked dust is discharged to the outside. (For example, refer to Patent Document 1).
JP-A-6-74521

  However, even if the dust suctioned and cleaned by the dust suction device is discharged to the outside, the dust sucked by the fan of the dust suction device adheres and accumulates on the fan surface, and the suction air volume of the dust suction device decreases and the suction performance is reduced. In the worst case, it may be impossible to suck dust. In addition, dust that does not adhere to or accumulate on the fan drifts inside the suction cover and entrains other dust, and the lump of dust that has grown enters the gap between the fan and the casing, preventing rotation. There was also a problem of locking.

  The present invention has been made in view of the above-described problems of the prior art, and prevents the dust sucked into the fan from adhering to and accumulating on the fan surface, thereby reducing the suction performance by reducing the suction air volume. The object is to provide a fan unit for an air conditioner that prevents and has high reliability.

  In order to achieve the above object, the present invention is a fan unit provided in an air conditioner, comprising a fan having a plurality of blades arranged on a circumference, and a casing for housing the fan, wherein the blade At least one rib is provided in the casing in the vicinity of the inner edge of the.

  Further, the rib is bent in a substantially L shape, and has an extending part extending radially inward from an inner edge part of the casing, and a bent part bent from the extending part. .

  Further, the rib has an acute angle at a corner between the first surface upstream of the bent portion in the rotation direction of the blade and the second surface of the bent portion facing the blade. It is preferable to set.

  More preferably, the corner between the first surface and the second surface has a ridge angle.

  Moreover, it is good to set the angle which the surface of the upstream of the base of the said extension part makes with the tangent of the inner edge part of the said casing to an obtuse angle.

  Moreover, it is also preferable that the rib is set so that the upstream surface of the bent portion in the rotation direction of the blade is inclined toward the downstream side in the rotation direction toward the tip.

  Further, the rib may have a rising portion extending upstream from the casing in the suction direction of the fan, and the extending portion may be further separated from the blade.

  According to the present invention, since at least one rib is provided in the casing accommodating the fan in the vicinity of the inner edge portion of the blade, even if dust adheres to the surface of the blade, the attached dust is caused by the rotation of the blade. It comes into contact with the rib and peels off from the blade surface. Therefore, it is possible to provide a highly reliable air conditioner by preventing a reduction in the suction air volume of the fan due to the accumulation of dust due to adhesion to the blade surface to prevent a reduction in the suction performance.

  In addition, the rib is bent into a substantially L shape, so that it has a shape including an extending portion extending radially inward from the inner edge portion of the casing and a bent portion bent from the extending portion. The bent portion can be easily disposed in the vicinity of the inner edge portion of the blade, and dust attached to the blade can be removed with a simple configuration.

  Furthermore, when the angle of the corner between the first surface upstream of the bent portion in the rotation direction of the blade and the second surface of the bent portion facing the blade is set to an acute angle, dust attached to the blade It becomes easy to hook the sharp angle portion, and dust can be easily removed.

  In addition, if the corner between the first surface and the second surface is set to have a ridge angle, the dust attached to the blade can be more easily caught.

  Also, if the angle formed by the upstream surface of the base of the extension and the tangent to the inner edge of the casing is set to an obtuse angle, the dust will drift inside the suction cover without adhering to the fan, and it will grow by entraining other dust. The lump of dust that has been deposited does not accumulate at the base of the rib. Therefore, the worst situation of the fan locking can be prevented, and a highly reliable air conditioner can be provided.

  In addition, if the shape is set so that the upstream surface of the bent portion in the rotational direction of the blade is inclined toward the downstream side in the rotational direction toward the tip, the attached dust can be easily separated and detached, and the dust on the fan surface It is possible to provide a highly reliable air conditioner by preventing a reduction in the suction air volume of the fan accompanying the adhesion and accumulation of the air and preventing a reduction in the suction performance.

  Also, if the rib has a rising part that extends upstream from the casing in the fan suction direction, and the extension part is further separated from the blade, the space between the extension part and the blade becomes large and is sucked by the fan. Therefore, it is possible to prevent the dust from drifting inside the suction cover without adhering to the fan and entraining and growing other dust.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a front view of an indoor unit of an air conditioner according to the present invention, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is an air filter provided in the indoor unit. It is a perspective view which shows the cleaning mechanism.

  As shown in FIGS. 1 to 3, inside the indoor unit 1, a heat exchanger 20, a fan (not shown) that blows out the air heat-exchanged by the heat exchanger 20 into the room, and the heat exchanger 20. An air filter 2 for removing dust that passes through is disposed. A dust suction device 3 for sucking and discharging dust adhering to the air filter 2 is installed near the side surface in the indoor unit 1. A suction nozzle 6 is connected to a suction side portion (suction duct connection port 4) of the dust suction device 3 via a bellows-shaped suction duct 5, and a discharge side portion (exhaust duct connection port) of the dust suction device 3 7) is connected to an exhaust duct 8 whose tip communicates with the outside.

  A plurality of suction holes 6a are formed side by side on the surface of the suction nozzle 6 facing the air filter 2 from the upper surface portion to the front surface portion of the air filter 2, and each suction hole 6a is removed by suction operation of the dust suction device 3 described later. The air filter 2 is cleaned by sucking dust adhering to the air filter 2.

Embodiment 1 FIG.
FIG. 4 is a schematic perspective view of the dust suction device 3 provided in the indoor unit 1, and FIG. 5 is a perspective view of a main part of the dust suction device 3. FIG. 6 is a partially enlarged view of the dust suction device 3, and FIG. 7 is a schematic sectional view of the dust suction device 3.

  As shown in FIGS. 4 to 7, the dust suction device 3 includes a centrifugal fan 10 that is rotated by an intake / exhaust motor 9, a casing 11 that houses the fan 10, and a casing 11 that is integrated with the casing 11 on the windward side of the casing 11. It is comprised as a fan unit which has the suction cover 12 provided in 1 and the attachment board | substrate 13 to which the casing 11 etc. were attached. The fan 10 has a plurality of blades 21 arranged circumferentially, and the blades 21 rotate in the direction of arrow B in FIG.

  In this configuration, the intake / exhaust motor 9 is rotated forward for suction and the nozzle driving motor 14 is driven. Then, in a state where the dust suction device 3 is activated, the suction nozzle 6 moves along the windward surface of the air filter 2, and dust adhering to the air filter 2 is sucked into the suction nozzle 6 together with the air through the suction hole 6a. Then, the dust sucked into the dust suction device 3 from the suction duct 5 is discharged outside the room through the exhaust duct 8 together with air. The air and dust sucked into the dust suction device 3 flow in the direction of arrow C in FIG.

  When used for a long period of time, as shown in FIG. For this reason, in this invention, as shown in FIGS. 5-7, it extends radially inward from the inner edge part of the casing 11 which accommodates the fan 10, and also is the direction orthogonal to this extension part 15a (fan 10). A substantially L-shaped rib 15 is provided which is bent on the downstream side in the suction direction. The bent portion 15b of the rib 15 is provided at a predetermined distance from the inner edge portions of the plurality of blades 21 constituting the fan 10, and when the fan 10 rotates, the bent portion 15b of the rib 15 is provided for each blade 21. It faces the inner edge of each. Here, at least one rib 15 may be provided, and a plurality of ribs may be provided in consideration of the suction air volume of the dust suction device 3.

  With the above configuration, dust adhering to the air filter 2 is sucked by the dust suction device 3 through the suction nozzle 6, and even if dust A adheres to the surface of the blade 21, it adheres to the surface by rotation of the blade 21. The dust A comes into contact with (collises with) the rib 15, and the dust A is peeled off and separated from the surface of the blade 21. The separated and separated dust A is discharged together with air through the exhaust duct 8 to the outside by the suction force of the dust suction device 3. Accordingly, it is possible to prevent a decrease in the suction air volume of the dust suction device 3 due to the accumulation of dust A on the surface of the blade 21, and to prevent a decrease in the suction performance of the indoor unit of the air conditioner with high reliability. Can be provided.

  As described above, the rib 15 has a substantially L shape, and the bent portion (free end) 15b can be arranged at a desired position with respect to the casing 11 with a simple configuration.

  Further, as shown in FIG. 6, the surface of the bent portion 15 b of the rib 15 facing the rotation direction B of the blade 21 (the surface on the upstream side of the bent portion 15 b in the rotation direction B of the blade 21) and the blade 21 are opposed. The angle of the corner 23 between the bent portion 15 b and the surface of the bent portion 15 b is set to an acute angle α (α <90), and the dust A adhering to the surface of the blade 21 as the blade 21 rotates contacts the rib 15. At the time of contact, the acute angle portion 23 can easily catch the dust A adhering to the blade 21, and the dust A adhering to the blade 21 can be easily removed.

  Furthermore, as shown in FIG. 6, the above-described acute angle portion 23 has a ridge angle portion (the surface on the upstream side of the rib 15 in the rotation direction B of the blade 21 and the surface facing the blade 21 are pointed and not rounded) 24. By setting the shape to have, as the blade 21 rotates, when the dust A adhering to the surface of the blade 21 comes into contact with the rib 15, it is more easily caught by the ridge corner portion 24, and is peeled off and detached.

Embodiment 2. FIG.
In the present embodiment, as shown in FIG. 8, a substantially L-shaped rib 15 is provided on the inner edge of the casing 11, and the root of the rib 15 in the rotation direction B of the blade 21 (the root of the extending portion 15 a). The angle formed by the upstream surface and the tangent to the inner edge of the casing 11 at the base of the rib 15 is set to an obtuse angle β (β ≧ 90). With this configuration, the dust sucked by the fan 10 does not adhere to the fan 10 and drifts inside the suction cover 12, and a lump of dust that grows by entraining other dust does not accumulate at the base of the rib 15. .

  9 shows the rib 15 in FIG. 8 as viewed from the arrow IX. As shown in FIG. 9, the upstream surface of the bent portion (free end) 15b of the rib 15 in the rotation direction B of the blade 21 is shown in FIG. 15c is set to be inclined toward the downstream side in the rotation direction B toward the tip (inclination angle γ). By setting the shape of the bent portion 15b in this way, it is possible to prevent dust from adhering and accumulating on the upstream surface 15c of the bent portion 15b, and to prevent the suction performance of the dust suction device 3 from being lowered. be able to.

  Furthermore, as shown in FIG. 10, a rising portion may be provided on the substantially L-shaped rib 15 so as to form an inverted U shape in a side view. That is, the rib 15 shown in FIG. 10 includes a rising portion 15d extending from the inner edge of the casing 11 to the upstream side in the suction direction of the fan 10, and an extending portion 15a extending radially inward from the tip of the rising portion 15d. And a bent portion 15b bent in a direction orthogonal to the extending portion 15a (downstream side in the suction direction of the fan 10).

  In this configuration, as compared with the configuration of FIG. 8 or FIG. 9, the extended portion 15 a extending substantially parallel to the casing 11 is further away from the blade 21, and is as large as possible between the extended portion 15 a and the blade 21. By providing the space, the dust sucked by the fan 10 is prevented from drifting inside the suction cover 12 without adhering to the fan 10 and being entrained and growing by other dust.

  As described above, the present invention has been described by taking the indoor unit of the air conditioner as an example. However, the present invention is not limited to the indoor unit of the air conditioner, and is provided in an outdoor unit or an exhaust fan unit of the air conditioner. It can also be applied to fans and the like.

  Although the fan unit according to the present invention can be applied to an air conditioner, the fan unit can also be applied to devices installed in an environment having an air filter and capable of exhausting air outside the air conditioner.

FIG. 1 is a front view of an indoor unit of an air conditioner according to the present invention. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a perspective view showing an air filter provided in the indoor unit and its cleaning mechanism. FIG. 4 is a perspective view of the dust suction device provided in the indoor unit according to Embodiment 1 of the present invention. FIG. 5 is a perspective view of a main part of the dust suction device of FIG. FIG. 6 is a partially enlarged view of the dust suction device of FIG. FIG. 7 is a schematic cross-sectional view of the dust suction device of FIG. FIG. 8 is a partially enlarged view of the dust suction device provided in the indoor unit according to Embodiment 2 of the present invention. FIG. 9 is a partially enlarged view showing a modification of the dust suction device of FIG. FIG. 10 is a partially enlarged view showing another modification of the dust suction device of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Air filter 3 Dust suction apparatus 4 Suction duct connection port 5 Suction duct 6 Suction nozzle 6a Suction hole 7 Exhaust duct connection port 8 Exhaust duct 9 Suction / exhaust motor 10 Fan 11 Casing 12 Suction cover 13 Mounting board 14 For nozzle drive Motor 15 Rib 15a Extension portion 15b Bending portion 15c Upstream surface of the bending portion 15d Rising portion 21 Blade 23 Sharp corner portion 24 Ridge corner portion

Claims (5)

A fan unit provided in an air conditioner,
Fan and a casing for accommodating the fan, and at least one rib provided on the casing of the inner edge vicinity of the blade, wherein the rib is substantially L-having a plurality of blades arranged on the circumference A bent portion extending inward in the radial direction from the inner edge of the casing, and a bent portion bent from the extended portion, and the folding in the rotation direction of the blade. A fan unit for an air conditioner, characterized in that the first surface on the upstream side of the curved portion is set to be inclined toward the downstream side in the rotational direction toward the tip . 2. The air conditioner according to claim 1 , wherein the rib has an acute angle at a corner between the first surface and the second surface of the bent portion facing the blade. Fan unit for machine. The fan unit for an air conditioner according to claim 2 , wherein a corner between the first surface and the second surface has a ridge angle. The air conditioning according to any one of claims 1 to 3 , wherein an angle formed between an upstream surface of the base of the extension portion and a tangent to an inner edge portion of the casing is set to an obtuse angle. Fan unit for machine. The ribs have the rising portion extending upstream in the suction direction of the fan from the casing, the extended portion to any one of claims 1 4, characterized in that further away from the blade The air conditioner fan unit described.

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