CN101048620B - Fan unit for air conditioner - Google Patents

Abstract

Provided is a fan unit installed in an air conditioner, characterized in that it includes: a fan having a plurality of blades arranged on the circumference; At least one rib is provided, the rib being spaced from the inner edge portion of the blade.

Description

Fan unit for air conditioner

technical field

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

Background technique

In the filter device provided on the indoor unit of the existing air conditioner, an air filter for preventing dust from entering the body of the air conditioner is provided in front of the heat exchanger, and the air filter is detachably constructed. And the attached dust can be removed by hand. The filter device with such a structure not only requires frequent maintenance, but also the air filter is gradually clogged until the maintenance is performed. As a result, the air volume passing through the heat exchanger decreases, the ability to regulate air decreases, and the power consumption increases.

Therefore, for the purpose of reducing the maintenance man-hours of the air filter, an automatic cleaning device (such as , refer to Patent Document 1).

Patent Document 1: JP-A-6-74521

However, even if the dust sucked and cleared by the dust suction device is discharged to the outside, the dust sucked by the fan of the dust suction device adheres to and accumulates on the surface of the fan, the suction air volume of the dust suction device decreases, and the suction performance decreases. , and may not be able to attract dust. In addition, the dust that is not attached to the fan and accumulated on the fan floats inside the suction cover, and the dust lumps grown by being involved with other dust will enter the gap between the fan and the housing, hindering the rotation, and in the worst case, there is a lock. Problem with the fan.

Contents of the invention

The present invention is made in view of such problems in the prior art, and aims to provide a highly reliable air conditioner fan unit that prevents dust attracted by the fan from adhering to and accumulating on the surface of the fan. Prevents reduction in suction performance due to reduction in suction air volume.

In order to achieve the above object, the present invention provides a fan unit installed in an air conditioner, which is characterized in that it includes: a fan having a plurality of blades arranged on the circumference; The casing near the inner edge of the blade is provided with at least one rib spaced apart from the inner edge of the blade, the rib is bent into a substantially L-shape, and has a The inner edge portion of the blade extends radially inwardly, and the bent portion bent from the extended portion. Furthermore, the rib preferably divides the bent portion in the direction of rotation of the blade. An angle between the first surface on the upstream side and the corner portion of the bent portion with respect to the second surface of the blade is set to be an acute angle.

In addition, it is more preferable that a corner between the first surface and the second surface has a corner.

In addition, it is preferable that an angle formed by an upstream side surface of the base of the extending portion and a tangent to the inner edge of the case is set to be an obtuse angle.

In addition, the rib is preferably set so that the surface on the upstream side of the bent portion in the direction of rotation of the blade is inclined toward the downstream side in the direction of rotation toward the tip.

In addition, the rib has an upright portion extending from the casing toward the upstream side in the suction direction of the fan, so that the extended portion can be further separated from the blade.

Invention effect

According to the present invention, since at least one rib is provided close to the inner edge of the blade on the case housing the fan, even if dust adheres to the surface of the blade, the attached dust abuts against the rib by the rotation of the blade and is removed from the blade. The leaf surface peels off and falls off. Therefore, it is possible to prevent a decrease in the suction air volume of the fan due to the accumulation of dust due to the adhesion of the dust to the blade surface, prevent a decrease in the suction performance, and provide a highly reliable air conditioner.

In addition, since the rib is bent into a substantially L-shape and formed into a shape having an extension portion extending radially inward from the inner edge portion of the housing and a bending portion bent from the extension portion, Therefore, the bent portion can be easily arranged near the inner edge of the blade, and dust adhering to the blade can be removed with a simple structure.

Furthermore, if the angle between the first surface on the upstream side of the bent portion in the direction of rotation of the blade and the corner portion of the bent portion with respect to the second surface of the blade is set to be an acute angle, the acute-angled portion is easy to catch and adhere. Due to the dust on the blades, the dust can be easily removed.

In addition, if the corner between the first surface and the second surface has corners, it is easier to catch the dust adhering to the blade.

In addition, if the angle formed by the surface on the upstream side of the base of the extension part and the tangent line of the inner edge of the housing is set to be an obtuse angle, dust will not float inside the suction cover without adhering to the fan, and will not be rolled up. Dust lumps that have grown due to other dust are deposited on the base of the ribs. Therefore, it is possible to prevent the worst situation such as locking of the fan, and to provide a highly reliable air conditioner.

In addition, if the surface on the upstream side of the bent portion in the rotation direction of the blade is inclined toward the front end to the downstream side of the rotation direction and the shape is set, it is easy to peel off and fall off the attached dust, and prevent the dust from adhering to the surface of the fan. , The accumulation causes the decrease of the suction air volume of the fan, prevents the decrease of the suction performance, and can provide an air conditioner with high reliability.

In addition, the rib has a raised portion that extends from the casing to the upstream side in the suction direction of the fan, so that the extended portion is further away from the blade, and the space between the extended portion and the blade becomes larger, which can prevent the fan from sucking. When the dust does not adhere to the fan, it floats inside the suction cover, and other dust is involved and grows.

Description of drawings

Fig. 1 is the front view of the indoor unit of air conditioner of the present invention;

Fig. 2 is a sectional view along line II-II of Fig. 1;

Fig. 3 is a perspective view showing the air filter and its cleaning mechanism provided on the indoor unit;

4 is a perspective view of a dust suction device provided in the indoor unit according to Embodiment 1 of the present invention;

Fig. 5 is a perspective view of main parts of the dust suction device of Fig. 4;

Fig. 6 is a partially enlarged view of the dust suction device of Fig. 4;

Fig. 7 is a schematic cross-sectional view of the dust suction device of Fig. 4;

8 is a partially enlarged view of a dust suction device provided on an indoor unit according to Embodiment 2 of the present invention;

Fig. 9 is a partially enlarged view showing a modified example of the dust suction device of Fig. 8;

Fig. 10 is a partially enlarged view showing another modified example of the dust suction device of Fig. 8 .

In the picture:

1-indoor unit; 2-air filter; 3-dust suction device; 4-suction pipe connection port; 5-suction pipe; 6-suction nozzle; 6a-suction hole; 7-exhaust pipe connection port; 8- Exhaust duct; 9-suction and exhaust motor; 10-fan; 11-casing; 12-suction cover; 13-mounting substrate; 14-motor for nozzle driving; 15-rib (rib); 15a-extension part 15b-bending part; 15c-the upstream side surface of the bending part; 15d-rising part; 21-blade; 23-acute corner;

Detailed ways

Hereinafter, based on embodiment of this invention, it demonstrates referring drawings.

1 is a front view of an indoor unit of an air conditioner according to the present invention, FIG. 2 is a sectional view along line II-II of FIG. 1 , and FIG. 3 is a perspective view showing an air filter and its cleaning mechanism provided on the indoor unit.

As shown in FIGS. 1 to 3 , the interior of the indoor unit 1 is provided with: a heat exchanger 20 , a fan (not shown) that blows the air that has undergone heat exchange in the heat exchanger 20 into the room, and a fan (not shown) that removes the passing heat. Air filter 2 for exchanger 20 dust. In the vicinity of the side surface in the indoor unit 1 , a dust suction device 3 for sucking and discharging dust adhering to the air filter 2 is disposed. At the suction side part (suction duct connection port 4) of this dust suction device 3, it is connected with the suction nozzle 6 via the suction duct 5 of bellows shape, and at the blowing side part (exhaust duct connection port 7) of the dust suction device 3 ), connected with the exhaust pipe 8 whose front end communicates with the outside.

On the surface of the suction nozzle 6 facing the air filter 2, a plurality of suction holes 6a are arranged in a row from the upper part of the air filter 2 toward the front part, and are sucked by the suction action of the dust suction device 3 described later. The suction hole 6 a sucks the dust adhering to the air filter 2 to clean the air filter 2 .

Embodiment 1

FIG. 4 is a schematic perspective view of the dust suction device 3 installed in the indoor unit 1 , and FIG. 5 is a perspective view of main parts of the dust suction device 3 . In addition, FIG. 6 is a partial enlarged view of the dust suction device 3 , and FIG. 7 is a schematic cross-sectional view of the dust suction device 3 .

As shown in Figures 4 to 7, the dust suction device 3 is constituted as a fan unit, which has: a centrifugal fan 10 rotating under the action of the suction and exhaust motor 9; a casing 11 for accommodating the fan 10; The suction cover 12 provided integrally with the housing 11 on the windward side of the housing 11; The plurality of blades 21 of the fan 10 are arranged in a circumferential shape, and the blades 21 rotate in the direction of arrow B in FIG. 6 .

In this configuration, the suction/exhaust motor 9 is rotated forward for suction, and the nozzle driving motor 14 is driven. Then, in the state where the dust suction device 3 is in operation, the suction nozzle 6 moves along the surface on the windward side of the air filter 2, and the dust adhering to the air filter 2 is sucked into the suction pipe through the suction hole 6a together with the air. In the nozzle 6, the dust sucked into the dust suction device 3 from the suction duct 5 is discharged to the outside through the exhaust duct 8 together with the air. The air and dust sucked into the dust suction device 3 flow in the direction of arrow C in FIG. 7 .

In the case of long-term use, as shown in FIG. 6 , dust A may adhere and accumulate on the surfaces of the blades 21 constituting the fan 10 . Therefore, in the present invention, as shown in FIGS. The extension portion 15 a is bent in a direction perpendicular to it (downstream side in the suction direction of the fan 10 ). The bent portion 15b of the rib 15 is provided at a predetermined distance from the inner edges 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 sequentially aligned with the inner edges of the blades 21 . margin. Here, at least one rib 15 is sufficient, and a plurality of ribs may be provided in consideration of the suction air volume of the dust suction device 3 .

With the above structure, the dust adhering to the air filter 2 is sucked by the dust suction device 3 through the suction duct 6, even if the dust A is adhering to the surface of the blade 21, the rotation of the blade 21 causes the dust A adhering to the surface to come into contact (collision). ) on the rib 15, the dust A is peeled off from the surface of the blade 21 and falls off. The peeled off dust A is discharged to the outside through the exhaust duct 8 together with the air under the action of the suction force of the dust suction device 3 . Therefore, it is possible to prevent the reduction of the suction air volume of the dust suction device 3 due to the accumulation of the dust A attached to the surface of the blade 21, and to prevent the reduction of its suction performance, and to provide a highly reliable indoor unit of the air conditioner.

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

In addition, as shown in FIG. 6, the surface of the bent portion 15b of the rib 15 with respect to the rotation direction B of the blade 21 (the surface on the upstream side of the bent portion 15b in the rotation direction B of the blade 21) is opposite to the bent portion 15b. The angle of the corner portion 23 between the surfaces of the blades 21 is set to be an acute angle α (α<90). When the blades 21 rotate, when the dust A adhering to the surfaces of the blades 21 abuts against the ribs 15, the blades The dust A attached to the blade 21 is easily caught on the acute corner portion 23, and the dust A attached to the blade 21 can be easily removed.

Furthermore, as shown in FIG. 6, by setting the above-mentioned acute-angled portion 23 to have an angular portion (the surface on the upstream side of the rib 15 in the direction of rotation B of the blade 21 and the surface relative to the blade 21 are sharp and have no rounded corners) 24 With the rotation of the blade 21, when the dust A adhering to the surface abuts against the rib 15, it is more likely to catch on the corner portion 24, thereby peeling off and falling off.

Embodiment 2

In this embodiment, as shown in FIG. 8 , a substantially L-shaped rib 15 is provided on the inner edge of the housing 11, and the root of the rib 15 in the direction of rotation B of the blade 21 (the root of the extended portion 15a) The angle formed by the surface on the upstream side of the rib 15 and the tangent to the inner edge of the housing 11 at the root of the rib 15 is set to be an obtuse angle β (β≧90). According to this configuration, the dust sucked by the fan 10 does not adhere to the fan 10 but floats inside the suction cover 12 , and dust lumps generated by entraining other dust do not accumulate on the bases of the ribs 15 .

In addition, FIG. 9 is a view of the rib 15 viewed from the arrow IX in FIG. 8, and as shown in FIG. It is set to be inclined toward the downstream side of the rotation direction B toward the front end (inclination angle γ). By setting the bent portion 15b in such a shape, it is possible to prevent dust from adhering to and accumulating on the upstream surface 15c of the bent portion 15b, thereby preventing a reduction in the suction performance of the dust suction device 3 .

Furthermore, as shown in FIG. 10, a standing portion is provided on the substantially L-shaped rib 15, and it may be formed in an inverted U-shape when viewed from the side. That is, the rib 15 shown in FIG. 10 includes: an upright portion 15d extending from the inner edge of the casing 11 toward the upstream side in the suction direction of the fan 10; an extension portion 15a extending from the front end of the upright portion 15d extending radially inward; and a bent portion 15 b bent in a direction perpendicular to the extending portion 15 a (downstream side in the suction direction of the fan 10 ).

In this structure, compared with the structure shown in FIG. 8 or FIG. 9 , the extended portion 15a extending substantially parallel to the housing 11 is farther away from the vane 21 . By setting as large a space as possible between the extended portion 15a and the vane 21, This prevents the dust sucked by the fan 10 from adhering to the fan 10 , floating inside the suction cover 12 , and being drawn into other dust to grow.

Above, the present invention has been described by taking the indoor unit of the air conditioner as an example, but the present invention is not limited to the indoor unit of the air conditioner, and can also be applied to fans installed in the outdoor unit or exhaust fan unit of the air conditioner.

Industrial Applicability

The fan unit of the present invention can be applied to an air conditioner, but it can also be applied to an apparatus installed in an environment capable of exhausting air to the outside that has an air filter other than an air conditioner.

Claims (5)

1. a fan unit that is arranged at air conditioner is characterized in that,

It possesses: fan, and it has a plurality of blades that dispose on circumference; And housing, it accommodates this fan,

Near the inner edge portion of described blade described housing is provided with at least one rib, and the inner edge portion of described rib and described blade is spaced apart,

Described rib is flexed into roughly L word shape, and have from the inner edge portion of described housing to radial direction inboard extended prolong portion and from this prolong portion's warpage joggling part,

And described rib is acute angle with first of the upstream side of the described joggling part on the direction of rotation of described blade and described joggling part with respect to the angle initialization in the bight between second of described blade.

2. fan unit for air conditioning as claimed in claim 1 is characterized in that,

Bight between described first and described second has corner angle.

3. fan unit for air conditioning as claimed in claim 1 is characterized in that,

The tangent line angulation of the face of the described upstream side that prolongs the root that portion and the inner edge portion of described housing is set at the obtuse angle.

4. fan unit for air conditioning as claimed in claim 1 is characterized in that,

Described rib is set at: the forward end that faces of the upstream side of the described joggling part on the direction of rotation of described blade tilts to the downstream of direction of rotation.

5. fan unit for air conditioning as claimed in claim 1 is characterized in that,

Described rib has rising portions, and this rising portions extends from the upstream side of described housing on the suction direction of described fan, makes described prolonging the described further away from each other blade of portion.

Images