WO2015104838A1

WO2015104838A1 - Centrifugal fan, air-conditioning device, and air-cleaning device

Info

Publication number: WO2015104838A1
Application number: PCT/JP2014/050337
Authority: WO
Inventors: 池田　尚史; 惇司河野; 昌彦高木; 栗原　誠; 潔吉村
Original assignee: 三菱電機株式会社
Priority date: 2014-01-10
Filing date: 2014-01-10
Publication date: 2015-07-16
Also published as: JP6211101B2; EP3093500A1; JPWO2015104838A1; EP3093500A4; EP3093500B1

Abstract

A centrifugal fan (3) provided with a principal plate (3b), a shroud (3g), and a plurality of blades (3a), wherein: the principal plate (3b) includes a base (3cd), a hub (3c), and a guide part (51); the hub (3c) projects toward the shroud (3g) side in the center section of the principal plate (3cd); the base (3cd) is positioned around the hub (3c); the guide part (51) is positioned to the outside of the hub (3c); the guide part includes a rotating wall (30) and an induction part (31); the rotating wall (30) extends at an angle to the direction in which the base (3cd) extends, when viewed as a vertical section; and the induction part (31) is provided on a surface outside the guide part (51) on the upstream side of the rotating wall (30).

Description

Centrifugal fan, air conditioner and air purifier

The present invention relates to a centrifugal fan, an air conditioner, and an air purifier.

In the ceiling-embedded air conditioner, a suction port and an air outlet are formed on the lower surface of the device facing the air-conditioned room. And after adjusting the temperature of the air sucked into the case from the suction port with a heat exchanger provided in the case, the air is sent out from the air outlet to the room.

The above-described air flow of the air conditioner is created by a centrifugal fan that sucks air upward from below and turns the flow outward in the radial direction to blow out air. The centrifugal fan has a shroud, a main plate, and a plurality of blades provided between the shroud and the main plate.

When the flow that turns from the upward direction to the radial direction by the centrifugal fan as described above (the flow that flows between the main plate and the shroud of the centrifugal fan) is the main flow, from the outside (upper side) of the main plate to the inside of the main plate There is also an air conditioner that generates a subflow in which air travels.

For example, in Patent Document 1, a guide is provided on the upper side of the center of the main plate, and an air flow along the inside and outside of the guide is generated to generate a subflow. Further, there is a centrifugal fan drive motor at the upper center of the main plate, and it has been expected that the cooling effect of the drive motor can be obtained by this subflow.

Japanese Patent No. 4684085

Here, there is a concern that the flow of the sub-flow tends to be disturbed by that amount because the channel tends to be narrower than the main flow.

The present invention has been made in view of the above, and an object of the present invention is to provide a centrifugal fan or the like that can obtain a subflow that is less likely to be disturbed.

The present invention for achieving the above object is a centrifugal fan comprising a main plate, a shroud, and a plurality of blades, wherein the main plate includes a base, a hub, and a guide portion, , Projecting toward the shroud side at the center of the main plate, the base is located around the hub, the guide is located outside the hub, and the guide Includes a turning wall and an attracting portion, and the turning wall extends in an inclined manner with respect to the extending direction of the base when viewed in a longitudinal section, and the attracting portion is located upstream of the turning wall. Are provided on the outer surface of the guide portion.
The attraction part may be a round part. Alternatively, the attraction part may be a recess that opens toward the outside of the guide part.
The guide portion and the base may be configured by integral molding. In that case, a flat surface may be provided between the defining portion of the subflow outlet provided in the main plate and the inner surface of the turning wall.
The guide portion may be welded to at least the base or the hub. In that case, the guide surface which guides a subflow to the subflow blower outlet provided in the said main board may be provided in the surface inside the said rolling wall. Further, the guide surface may be flush with a defining portion of a subflow outlet provided in the main plate. Furthermore, the guide part may be welded to the outer surface of the hub. The guide portion may include a flange portion extending along the base, the flange portion may be in surface contact with the base, and the guide portion may be welded to the base at the flange portion. .
The air conditioner of the present invention that achieves the same object includes a case, a heat exchanger disposed in the case, and the above-described centrifugal fan according to the present invention disposed in the case.
An air cleaning apparatus of the present invention that achieves the same object includes a case, a filter disposed in the case, and the above-described centrifugal fan according to the present invention disposed in the case.

According to the present invention, it is possible to obtain a subflow that is less likely to be disturbed in the centrifugal fan.

It is a figure which shows the installation state of the air conditioning apparatus of Embodiment 1 of this invention. It is the figure which showed the internal structure of the air conditioning apparatus of this Embodiment 1 from the side. It is a figure which shows the internal structure of the air conditioning apparatus of this Embodiment 1 planarly. It is a figure of the aspect same as FIG. 2 regarding the centrifugal fan of this Embodiment 1, and its surrounding part. It is a figure which expands and shows the guide part of this Embodiment 1, and its peripheral part. It is a figure of the same aspect as FIG. 4 regarding Embodiment 2 of this invention. It is a figure of the same aspect as FIG. 5 regarding this Embodiment 2. FIG. It is a perspective view which shows the guide part regarding this Embodiment 2. FIG. It is a figure of the same aspect as FIG. 6 regarding Embodiment 3 of this invention. It is a figure of the same aspect as FIG. 7 regarding this Embodiment 3. FIG. It is a figure of the same aspect as FIG. 8 regarding this Embodiment 3. FIG. It is a figure of the same aspect as FIG. 6 regarding Embodiment 4 of this invention. It is a figure of the same aspect as FIG. 8 regarding this Embodiment 4. FIG. It is a figure of the same aspect as FIG. 6 regarding the form which combined the structure of Embodiment 1 and the structure of Embodiment 4. FIG. It is a figure of the same aspect as FIG. 6 regarding the form which combined the structure of Embodiment 1 and the structure of

Embodiment

3, 4. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an installation state of the air-conditioning apparatus according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing the internal structure of the air-conditioning apparatus according to Embodiment 1 from the side. FIG. 3 is a diagram illustrating the internal configuration of the air-conditioning apparatus according to Embodiment 1 in a plan view. FIG. 4 is a diagram of the same aspect as FIG. FIG. 5 is an enlarged view (enlarged view of a V portion in FIG. 4) showing the guide portion and its peripheral portion according to the first embodiment.

The air conditioner 100 is a so-called indoor unit of a packaged air conditioner, and most of the air conditioner 100 is embedded in the back of the ceiling of the room 15 that is a space to be air conditioned. FIG. 1 illustrates a state in which the lower part of the case 1 of the air conditioner 100 is looked up from the room.

The air conditioner 100 includes a case 1 embedded in a ceiling 15a of a space (room 15) to be air-conditioned. The case 1 is an example, but is generally formed in a rectangular parallelepiped shape. The case 1 includes an upper surface portion 1a, a side surface portion 1b, and a decorative panel 2 that is a lower surface portion. The upper surface portion 1a and the side surface portion 1b are made of sheet metal members. Moreover, the heat insulating material 1c is arrange | positioned inside each of the upper surface part 1a and the side part 1b, and the airway wall surface is comprised by such an upper surface part 1a and the side part 1b.

As shown in FIG. 3, the side surface portion 1 b has four main surfaces 21 oriented in two orthogonal axes, and further has a corner portion 22 between the two corresponding main surfaces 21. The side surface portion 1b is formed in a cylindrical shape extending vertically, and the upper portion of the side surface portion 1b is closed by the upper surface portion 1a, and the decorative panel 2 is provided below the side surface portion 1b. The case 1 is generally formed in a box shape by the upper surface portion 1a, the side surface portion 1b, and the decorative panel 2.

At the bottom of the case 1, that is, in the first embodiment, the decorative panel 2 is provided with at least one inlet 2a and at least one outlet 2b. In the air conditioning apparatus 100 according to the first embodiment, as an example, one suction port 2a and four air outlets 2b are provided as will be described later.

In the case 1, a centrifugal fan (turbo fan) 3, a fan motor 4, a bell mouth 5, and a heat exchanger 6 serving as a blower are housed. The centrifugal fan 3 creates a flow of air that is sucked into the case 1 from the suction port 2a and blown out from the blowout port 2b to the target space. The heat exchanger 6 is disposed in such an air flow path and adjusts the temperature of the air.

The suction port 2 a is provided at the center of the decorative panel 2 and extends over a wide area of the decorative panel 2. Moreover, although the suction inlet 2a of this Embodiment 1 is provided as a grille (grille) type, this invention is not limited to this. A filter 14 is provided on the upstream side of the suction port 2a (inside the case 1) to remove air after passing through the suction port 2a.

As an example, in the first embodiment, the decorative panel 2 and the suction port 2a each have a rectangular outer edge in plan view.

A plurality of air outlets 2b are provided in a region between the outer edge of the decorative panel 2 and the outer edge of the suction port 2a. In the first embodiment, each of the decorative panel 2 and the inlet 2a has four edges, and there are four outlets 2b, each of which is described later. It arrange | positions along the edge | side which corresponds in the decorative panel 2 and the suction inlet 2a except the corner part to perform. Moreover, the four blower outlets 2b are located so that the suction inlet 2a may be surrounded. Each air outlet 2b is provided with a wind direction plate 2c for adjusting the direction of air to be blown out.

ファン A fan motor 4 is disposed in the center of the case 1. The fan motor 4 is supported on the lower surface (the inner space side of the case) of the upper surface portion 1 a of the case 1. A centrifugal fan 3 is attached to a rotating shaft extending downward in the fan motor 4. Further, a bell mouth 5 is provided between the centrifugal fan 3 and the suction port 2 a to form a suction air path from the suction port 2 a toward the centrifugal fan 3. The centrifugal fan 3 sucks air into the case 1 from the suction port 2a, and causes the air to flow out from the blowout port 2b to a room (indoor) 15 that is a target space.

A heat exchanger 6 which is an example of a pressure loss body is disposed on the radially outer side of the centrifugal fan 3. In other words, the heat exchanger 6 is arranged in a flow path of air generated in the case by the centrifugal fan 3 and performs heat exchange between the air and the refrigerant.

The heat exchanger 6 has a plurality of fins arranged at a predetermined interval, and a heat transfer tube passing through the fins. The heat transfer tube is connected to a well-known outdoor unit (not shown) through a connection pipe, whereby the heat exchanger 6 is supplied with a cooled refrigerant or a heated refrigerant.

Further, the two end portions 6 a of the heat exchanger 6 are connected by a heat exchanger connecting plate 7. A space is formed on the outer side of the heat exchanger connecting plate 7 between the side surface side heat insulating material 1d, and the upper and lower sides of the space are blocked by the upper surface portion 1a and the drain pan 12, and the pipe storage space 10 is configured. Has been. In the pipe storage space 10, a header 8 and a distributor 9 connected to a heat transfer tube 6b extending from one end 6a of the two ends 6a are arranged.

A drain pan 12 for temporarily storing condensed water is provided below the heat exchanger 6. Further, on the back side of the drain pan 12, an electrical component box 13 for storing the electronic substrate is provided. In addition, the structure and aspect of the centrifugal fan 3, the bellmouth 5, and the heat exchanger 6 are not specifically limited, In this Embodiment 1, a well-known thing is used.

In such a configuration, when the centrifugal fan 3 rotates in the direction of arrow A, the air in the room 15 is sucked into the suction port 2a of the decorative panel 2 as indicated by the arrow B. The air removed by the filter 14 is guided by the bell mouth 5 and sucked into the centrifugal fan 3. Further, in the centrifugal fan 3, the air sucked upward from below is blown out from the fan outlet 3i in the horizontal direction and in the radial direction as indicated by the arrow C1. The air thus blown out is blown into the room 15 from each of the air outlets 2b by changing the flow direction downward after passing through the heat exchanger 6 which is a pressure loss body and after heat exchange and humidity adjustment. Is done. Further, the direction of the air blown into the room 15 is controlled by the wind direction plate 2c.

Here, the flow in the case 1 of the air conditioner 100 will be described. In case 1, a main flow and a sub flow are generated. The main flow is a flow indicated by arrows B and C1 as described above. That is, the main flow is a flow that flows into the centrifugal fan 3 that has flowed out of the bell mouth 5, flows through a space between a main plate 3b and a shroud 3g, which will be described later, and flows out from the fan outlet 3i. The subflow is a flow indicated by arrows C2, E1, and E2. That is, the sub-flow passes from the space outside the fan outlet 3i in the radial direction to the upper side of the centrifugal fan 3 (between the centrifugal fan 3 and the upper surface portion 1a) and from the central portion near the rotation shaft to the inside of the centrifugal fan 3. This is a flow that merges with the main flow, which will be described in detail later.

Next, the details of the centrifugal fan 3 will be described. The centrifugal fan 3 includes a plurality of blades 3a, a main plate 3b, and a shroud 3g.

The shroud 3g is an annular member that forms a suction guide channel to the blade 3a in plan view. The shroud 3g is opposed to the main plate 3b in the direction of the rotation axis RA of the centrifugal fan 3 and is provided away from the rotation axis RA of the centrifugal fan 3. The main plate 3b is provided on the upper surface portion 1a side of the case 1, and the shroud 3g is provided on the bell mouth 5 side.

A plurality of blades 3a are welded between the shroud 3g and the main plate 3b. That is, one end of each blade 3a is welded to the main plate 3b, and the other end of each blade 3a is welded to the shroud 3g.

The main plate 3b includes a base 3cd, a hub 3c, and a guide portion 51. At least the guide portion 51 and the base 3cd are formed by integral molding. As an example, in the first embodiment, the base 3cd, the hub 3c, and the guide portion 51 are formed by integral molding.

The hub 3c protrudes toward the shroud 3g side at the center of the main plate 3b (the rotation axis RA of the centrifugal fan 3 and its vicinity). The hub 3c has a diameter that decreases toward the rotation axis RA, and includes a portion that approaches the shroud 3g as it approaches the rotation axis RA. The above-described fan motor 4 is disposed in the fan central portion outer air passage 3f on the outer side (upper side) of the hub 3c.

Here, the “outer side” and “inner side” of each part related to the centrifugal fan 3 are determined as follows. First, the “inner side” in the part means the space side between the main plate and the shroud in the member as the inner side. In addition, the “outside” in the part is the outside on the opposite side of the space between the main plate and the shroud in the member. Therefore, to describe based on this “outside” / “inside” arrangement, the outer surface of the turning wall 30 to be described later is the upper surface of the turning wall 30, and the inner surface of the turning wall 30 is the turning wall. 30 is a lower surface (hub 3c side / shroud 3g side), and an outer surface of the hub 3c is an upper surface of the hub 3c (turning wall 30 side), and an inner side of the hub 3c (shroud 3g side). It becomes the side of.

A boss 3h for fixing the rotating shaft 4a of the fan motor 4 is formed integrally with the protruding end 3cb of the hub 3c.

The base 3cd is a portion located around the hub 3c. The base 3cd is an annular portion whose outer peripheral edge is circular in plan view. In addition, as an example, the base 3cd is a substantially flat plate-like portion and extends along one surface.

The guide part 51 is located outside the hub 3c. The guide part 51 includes a turning wall 30 and an attracting part 31. The turning wall 30 extends obliquely with respect to the extending direction of the base 3cd when viewed in the longitudinal section (as viewed in FIGS. 4 and 5). The turning wall 30 extends away from the hub 3c, and constitutes a part of the flow path of the subflow with the hub 3c.

Further, the turning wall 30 guides the subflow indicated by reference numeral E1 flowing outside the turning wall 30 so as to flow through a flow path between the inside of the turning wall 30 and the outside of the hub 3c, as indicated by reference numeral E2. Furthermore, it guides to the subflow blower outlet 3d provided in the main plate 3b.

The attracting part 31 is provided on the outer surface of the guide part 51 on the upstream side (upstream side of the subflow) of the turning wall 30. The attracting portion 31 is a round portion that smoothly connects the outer surface of the base 3 cd and the outer surface of the turning wall 30, and is a surface that is curved so as to bulge toward the outside of the guide portion 51. The attracting part 31 suppresses separation of the subflow flowing from the outside of the base 3cd to the outside of the rolling wall 30.

The main plate 3b has at least one (a plurality of in the first embodiment) sub-flow blower that is a through hole that communicates the outside (fan central portion outside air passage 3f) and the inside (fan internal air passage 3e) of the main plate 3b. An outlet 3d is provided. More specifically, the subflow outlet 3d is disposed on the base 3cd side with respect to the direction in which the rotation axis RA extends with respect to the tip opening 30a that is the tip of the turning wall 30 on the shroud 3g side. Specifically, the tip opening 30a is provided in the hub 3c.

A flat surface 32 is provided between the defining portion 3 s of the subflow outlet 3 d provided on the main plate 3 b and the inner surface of the turning wall 30. The flat surface 32 serves as a guide surface that guides the subflow to the subflow outlet 3d provided on the main plate 3b.

Based on such a configuration, as a sub-flow, a part of the air flowing out from the fan outlet 3i has a gap between the outer surface of the base 3cd and the heat insulating material 1c on the upper surface 1a side as indicated by reference numeral C2. , Flows inward in the radial direction (flows toward the rotation axis RA), and flows from the outer surface of the base 3cd along the outer surface of the turning wall 30, as indicated by reference numeral E1, by the attracting portion 31. As shown by reference numeral E2, the space between the inner surface of the rolling wall 30 and the outer surface of the hub 3c flows radially outward, and the space between the main plate 3b and the shroud 3g from the subflow outlet 3d. It flows out to (fan internal air passage 3e) and merges with the main flow.

According to the centrifugal fan and the air conditioner of the first embodiment configured as described above, the following advantages can be obtained. First, a subflow that flows through the fan center outer side air passage is obtained along with the flow of the main flow. Therefore, the fan motor can be cooled by the subflow flowing around the fan motor. In addition, when the subflow flows into the air passage outside the fan central part, an induction part made of a curved surface is provided upstream of the turning wall, so that the flow is less likely to peel off and flows along the outer surface of the turning wall. It is possible to obtain a subflow that is obtained and hardly disturbs. In particular, when the subflow does not flow along the outer surface of the turning wall when flowing into the air passage outside the central part of the fan, noise due to turbulence increases or motor cooling performance decreases due to a decrease in effective passage area. However, in the first embodiment, by obtaining a subflow that is less likely to cause disturbance, an increase in noise can be prevented, and the reliability of motor driving can be improved due to a sufficient motor cooling effect.

Moreover, in this Embodiment 1, since the flat surface which is a guide surface to a subflow blower outlet is provided, when flowing between the surface outside the hub and the surface inside the turning wall, the subflow is By traveling past the subflow outlet and colliding with the subsequent subflow or being obstructed by the subsequent subflow, there is also an advantage that the flow can be smooth and the subflow can be made smooth.

In addition, since the motor-cooled flow discharged from the subflow outlet to the fan internal air passage is discharged to the area near the corner where the hub extension direction and the base extension direction intersect, the subflow becomes the main flow. The disturbance at the time of joining can be suppressed, and the noise reduction by it can also be aimed at.

In the first embodiment, since the guide portion and the base are formed by integral molding, there is little unevenness from the outer surface of the base to the outer surface of the turning wall that passes through the attracting portion. A continuation plane can be obtained, which also reduces subflow disturbance.

In addition, the guide surface and the defining portion of the subflow outlet are the same surface, in other words, the guide surface and the defining portion of the subflow outlet are continuous, and the defining portion of the subflow outlet is It is the exit part of the surface which comprises a guide surface. Therefore, the loss of the subflow due to the unevenness can be suppressed, and the disturbance of the subflow can be reduced by providing the blowout portion with extremely small unevenness.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIGS. 6 and 7 are diagrams of the same mode as FIGS. 4 and 5 relating to the second embodiment, respectively. FIG. 8 is a perspective view showing a guide part according to the second embodiment. The second embodiment is the same as the first embodiment except for the parts described below.

The main plate 203b includes a base 3cd, a hub 3c, and a guide portion 251. The guide part 251 is located outside the hub 3 c and includes the turning wall 30, the attracting part 31, and the flange part 233. The flange portion 233 extends radially outward along the base 3cd.

The guide portion 251 is separate from the base 3cd and the hub 3c, and is welded to at least the base 3cd or the hub 3c. In the second embodiment, the flange portion 233 of the guide portion 251 is in surface contact with the base 3cd, and the guide portion 251 is welded to the outer surface of the base 3cd on the inner surface of the flange portion 233. Yes.

A guide surface 232 for guiding the subflow to the subflow outlet 3d provided on the main plate 3b is provided on the inner surface of the turning wall 30. The guide surface 232 is provided so as to be flush with the defining portion 3s of the subflow outlet 3d provided on the main plate 3b.

In the second embodiment configured as described above, similarly to the first embodiment, by obtaining a subflow that is less likely to be disturbed, an increase in noise can be prevented, and the reliability of motor driving due to a sufficient motor cooling effect can be prevented. The improvement in performance can be achieved.

In addition, since the guide surface to the subflow outlet is provided, as in the first embodiment, when the subflow flows between the outer surface of the hub and the inner surface of the turning wall, the subflow is connected to the subflow outlet. Proceeding too far, colliding with the subsequent subflow, or being obstructed by the subsequent subflow, there is an advantage that the subflow can be made smooth without causing the flow to be stagnant.

As in the first embodiment, the motor-cooled flow discharged from the subflow outlet to the fan internal air passage is discharged to a region near the corner where the hub extension direction and the base extension direction intersect. Therefore, the disturbance when the subflow merges with the main flow can be suppressed, and the noise can be reduced accordingly.

Moreover, since the guide part is separate from the base and the hub, even if the size of the motor is changed, it is not necessary to newly manufacture the entire centrifugal fan only by exchanging only the guide part. In addition, resource saving and cost reduction can be achieved by eliminating the need to remanufacture a large mold.

Further, since the guide portion is welded to the base of the main plate at the flange portion, it is possible to ensure a large immunity from welding between the guide portion and the base, and to improve the adhesion between the guide portion and the base, thereby improving the connection strength. Can be raised. Further, since the guide portion contacts the outer surface of the base on the inner surface of the collar portion, it is possible to reliably prevent the guide portion from dropping downward.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIGS. FIGS. 9 to 11 are views of the same mode as FIGS. 6 to 8 relating to the third embodiment. In addition, this Embodiment 3 shall be the same as the corresponding structure of the said

Embodiment

1 or 2 except the part demonstrated below.

The main plate 303b includes a base 3cd, a hub 3c, and a guide portion 351. The guide part 351 includes the turning wall 30, an attracting part 331, and a flange part 233. The attracting part 331 is a recess that opens toward the outside of the guide part 351.

The guide portion 351 is separate from the base 3cd and the hub 3c, and is welded to at least the base 3cd or the hub 3c. In the third embodiment, the guide portion 351 is welded to the outer surface of the base 3cd on the inner surface of the flange portion 233.

In the third embodiment configured as described above, since an attracting part made of a recessed part is provided upstream of the turning wall, when the subflow flows into the fan central part outside air passage, the negative pressure by the recessed part As a result, the subflow is drawn toward the outer surface of the guide portion, whereby the flow is hardly separated and the effect of flowing along the outer surface of the turning wall is obtained, and a subflow that is less likely to be disturbed can be obtained. Therefore, as in the first embodiment, by obtaining a subflow that is less likely to be disturbed, an increase in noise can be prevented and motor driving reliability can be improved by a sufficient motor cooling effect.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 12 and 13 are diagrams of the same mode as FIGS. 6 and 8 relating to the fourth embodiment. The fourth embodiment is the same as the corresponding configuration of the first to third embodiments except for the parts described below.

The main plate 403b includes a base 3cd, a hub 3c, and a guide portion 451. The guide part 451 includes the turning wall 30 and an attracting part 331. The attracting part 331 is a recessed part that opens toward the outside of the guide part 451.

The guide part 451 is separate from the base 3cd and the hub 3c, and is welded to at least the base 3cd or the hub 3c. In the fourth embodiment, the guide portion 451 is welded to the outer surface of the hub 3c on the inner surface of the guide portion 451 which is the opposite side of the attracting portion 331. Further, the upper end of the guide portion 451 that is the end opposite to the tip opening 30a (lower end after assembly) is flush with the outer surface of the base 3cd of the main plate 403b.

In the fourth embodiment configured as described above, since an attracting portion made of a concave portion is provided upstream of the turning wall, when the subflow flows into the fan central portion outside air passage, the negative pressure due to the concave portion is provided. As a result, the subflow is drawn toward the outer surface of the guide portion, whereby the flow is hardly separated and the effect of flowing along the outer surface of the turning wall is obtained, and a subflow that is less likely to be disturbed can be obtained. Therefore, as in the first embodiment, by obtaining a subflow that is less likely to be disturbed, an increase in noise can be prevented and motor driving reliability can be improved by a sufficient motor cooling effect.

In addition, since the upper end of the guide portion is flush with the outer surface of the base of the main plate, in the sub-flow that flows on the outer surface of the base of the main plate, turbulence caused by unevenness occurs before the attracting portion. Can be prevented.

Although the contents of the present invention have been specifically described with reference to the preferred embodiments, various modifications can be made by those skilled in the art based on the basic technical idea and teachings of the present invention. It is self-explanatory.

The present invention is not limited to the above-described embodiments themselves, and the characteristic configurations of the above-described embodiments can be implemented in combination. For example, as shown in FIG. 14, the centrifugal fan includes a structure including the attracting portion 31 that is the round portion of the first embodiment, and the base 3 cd and the hub 3 c and the guide portion 551 as in the fourth embodiment. You may have the aspect which combined the structure welded by the outer surface of the hub 3c in the inner surface of the guide part 551 which is a body and is the other side of the attracting part 31.

As another example, as shown in FIG. 15, the centrifugal fan includes a base plate 603b having a base 3cd and a hub 3c and a guide portion 651 integrally formed as in the first embodiment, and the embodiment. You may have the aspect which combined the structure provided with the attracting part 331 which is 3 and 4 recessed parts.

In the above-described embodiment, the subflow has been described as having a role as a cooling flow of the motor in the fan center outside air passage, but the present invention is not limited to this. Some devices having a centrifugal fan may adopt a layout in which a fan motor is not arranged in the air passage outside the central portion of the fan. The outside is the dead water area. Therefore, the present invention can also be implemented as a structure that can reduce the influence of turbulence due to the presence of a dead water area by obtaining a subflow in a layout in which there is no fan motor in the air passage outside the fan center. is there.

Further, the heat exchanger shown in the above-described embodiment is merely an example of a pressure loss body placed in the air flow path generated by the centrifugal fan in the air conditioner. Therefore, for example, an air purifying filter can be used as the pressure loss body placed in the air flow path generated by the centrifugal fan in the air purifying apparatus. That is, the present invention can also be implemented as an air cleaning device.

3 Centrifugal fan, 3a blade, 3b, 203b, 303b, 403b, 603b main plate, 3c hub, 3cd base, 3d subflow outlet, 3e fan internal air passage, 3f fan center outer air passage, 3g shroud, 30 turning wall, 30a tip opening, 31,331 attracting part, 32 flat surface, 51,251,351,451,551,651 guide part, 100 air conditioner, 232 guide surface, 233 collar part.

Claims

A centrifugal fan having a main plate, a shroud, and a plurality of blades,
The main plate includes a base, a hub, and a guide part,
The hub protrudes toward the shroud side at the center of the main plate,
The base is located around the hub;
The guide portion is located outside the hub;
The guide part includes a turning wall and an attracting part,
The rolling wall extends obliquely with respect to the extending direction of the base, as viewed in the longitudinal section,
The attraction part is provided on the outer surface of the guide part on the upstream side of the turning wall,
Centrifugal fan.
The attracting part is a round part.
The centrifugal fan according to claim 1.
The attraction part is a recess that opens toward the outside of the guide part,
The centrifugal fan according to claim 1.
The guide portion and the base are configured by integral molding.
The centrifugal fan according to any one of claims 1 to 3.
A flat surface is provided between the defining portion of the subflow outlet provided in the main plate and the inner surface of the turning wall.
The centrifugal fan according to claim 4.
The guide portion is welded to at least the base or the hub,
The centrifugal fan according to any one of claims 1 to 3.
On the inner surface of the turning wall, a guide surface that guides the subflow to the subflow outlet provided in the main plate is provided,
The centrifugal fan according to claim 6.
The guide surface is flush with the defining portion of the subflow outlet provided in the main plate.
The centrifugal fan according to claim 7.
The guide portion is welded to the outer surface of the hub.
The centrifugal fan according to any one of claims 6 to 8.
The guide part includes a flange part extending along the base,
The flange portion is in surface contact with the base, and the guide portion is welded to the base at the flange portion.
The centrifugal fan according to any one of claims 6 to 8.
Case and
A heat exchanger disposed in the case;
The centrifugal fan according to any one of claims 1 to 10 disposed in the case.
Air conditioner.
Case and
A filter disposed in the case;
The centrifugal fan according to any one of claims 1 to 10 disposed in the case.
Air cleaning device.