JP2006266664A - Ceiling embedded air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ceiling embedded air conditioner of high reliability and low noise preventing the failure of a motor by the improvement of motor cooling efficiency. <P>SOLUTION: The motor side of a hub 3c of downward projecting shape covering the motor 4 and fixing a rotating shaft 4a of the motor 4 is provided with an air guide cover 18 forming a motor side air course 3f between itself and the motor 4 and guiding air flowing into the motor side air course 3f from a clearance formed between a casing top plate 1b and a main plate 3b, toward the motor 4. The air guide cover 18 comprises a peripheral surface part 18c extended downward from the main plate 3b side and is formed such that the height position of a lower end opening 18b of the peripheral surface part 18c is located below a lower end surface 4b of the motor 4. The hub 3c has a plurality of openings 3d allowing air flowing into the motor side air course 3f from the clearance, flowing out of the lower end opening 18b of the air guide cover 18 and flowing into a clearance between the air guide cover 18 and the hub 3c, to flow out to a fan internal air course 3e. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ceiling-embedded air conditioner, and more particularly to an apparatus structure for improving motor cooling performance and reducing noise.

  A conventional ceiling-embedded air conditioner is arranged in a ceiling-embedded air conditioner body having a housing top plate, and in the ceiling-embedded air conditioner body so that the rotation axis is orthogonal to the housing top plate. A motor that covers the motor and has a lower convex hub that fixes the rotation shaft of the motor, and a surface that extends from the periphery of the upper opening surface of the hub to face the top plate and faces the top plate of the housing A main plate having a plurality of blades attached to a surface opposite to the main plate, a shroud that faces the main plate and constitutes a guide flow path of the blades, the hub, the main plate, and the shroud. A turbo fan that has a motor side air passage formed on the motor side and a fan internal air passage formed on the opposite side, and blows out the air sucked from the shroud side through the fan internal air passage. There is what it has (Prior Art 1). In this ceiling-embedded air conditioner, a part of the air blown out from the turbofan is introduced into the motor side air passage inside the hub through the gap between the housing top plate and the main plate to cool the motor. The cooled air is discharged from the opening hole provided near the motor side surface of the hub to the fan internal air passage outside the hub.

  Further, in the configuration of the above-described ceiling-embedded air conditioner, the position of the opening hole of the hub is changed to the lower side of the hub (near the fixing portion between the motor rotation shaft and the hub) instead of the vicinity of the motor side surface, and a plurality of There is an auxiliary fan provided with blades provided outside the hub so as to cover the lower opening hole (prior art 2) (see Patent Document 1). In this ceiling-embedded air conditioner, by providing an auxiliary fan, the amount of air flowing around the motor is increased to increase the cooling rate of the motor, and the lower opening is covered by covering the lower opening hole with the auxiliary fan. The operation sound of the motor leaking from the hole is reduced.

In the configuration of the prior art 2, the opening hole provided in the hub is a side opening hole in the vicinity of the side surface of the motor instead of the lower opening hole, and is substantially along the hub instead of the auxiliary fan. There is one in which an auxiliary hub formed in a convex shape is provided on the outside of the hub so as to cover a side opening hole (Prior Art 3) (see Patent Document 2).
Japanese Patent No. 3270567 Japanese Patent No. 3275474

  In the prior art 1, the air after cooling the motor flows out from the side opening hole of the hub to the fan internal air passage. At this time, the air is discharged from the side opening hole into the fan internal air passage. For this reason, the blades pass through the turbulence of the jet flow, and there is a problem that noise is deteriorated due to pressure fluctuation. Further, the jet-like flow discharged from the side opening hole interferes with the suction flow of the turbo fan. As a result, there is a problem that the flow rate of the actual blown flow from the turbofan is reduced, the blowing efficiency is deteriorated, and the noise value with respect to the air volume is deteriorated. Further, since the opening hole is provided in the side surface of the hub, the wind does not sufficiently flow to the lower end surface of the motor, and the motor cannot be effectively cooled, and the motor may be damaged due to heat generation.

  Moreover, in the prior art 2 and the prior art 3, although the opening hole provided in the hub is covered with the auxiliary fan or the auxiliary hub, it does not cover the whole hub but covers only a part. For this reason, as in the case of the prior art 1, the discharge flow from the opening hole interferes with the suction flow of the turbofan, which may cause noise deterioration.

  In addition, when transporting the air conditioner body by truck, the turbo fan vibrates due to vibration during transportation, and the outer peripheral edge of the turbo fan collides with the top plate of the air conditioner body by point contact, and stress is concentrated. However, there is a problem that the worst turbofan may be destroyed and reliability is lowered.

  The present invention has been made to solve the above-described problems, and is capable of preventing motor failure by improving motor cooling efficiency, and is highly reliable, and has a low noise and is embedded in a ceiling. The first object is to obtain the above.

  The second object is to obtain a ceiling-embedded air conditioner that can prevent the fan from being damaged during product transportation and has high product reliability.

  The ceiling-embedded air conditioner according to the present invention includes (a) a ceiling-embedded air conditioner body having a housing top panel, and (b) a housing top panel in the ceiling-embedded air conditioner body. A motor arranged so that the rotation axes are orthogonal to each other; (c) a lower convex hub that covers the motor and fixes the rotation axis of the motor; and extends from the periphery of the upper opening surface of the hub to face the top plate A main plate having a plurality of blades attached to a surface opposite to the surface facing the housing top plate, and a shroud that opposes the main plate and forms a guide flow path for the blades, and sucks from the shroud side. A turbo fan that blows air through a fan internal air passage formed on the opposite side of the hub from the motor side, and (d) a motor side air passage formed between the motor and the hub. , The air flowing into the motor side air passage from the gap formed between the housing top plate and the main plate, An air guide cover that guides air toward the motor, and the air guide cover includes a peripheral surface portion extending downward from the main plate side, and a height position of a lower end opening of the peripheral surface portion is a lower end surface of the motor. The hub flows into the motor side air passage from the gap, flows out from the lower end opening of the wind guide cover, and flows into the gap between the wind guide cover and the hub. It has a plurality of opening holes that allow it to flow out into the road.

  The ceiling-embedded air conditioner according to the present invention is provided in (a) a ceiling-embedded air conditioner body having a housing top plate, and (b) a ceiling-embedded air conditioner body. A turbofan that blows air, (c) a motor that drives the turbofan, and is arranged in the ceiling-embedded air conditioner body so that the rotation axis is orthogonal to the casing top plate; and (d) the turbofan A heat exchanger erected so as to surround, and (e) in a region corresponding to the inside of the heat exchanger in the housing top plate, projecting radially from the outer peripheral portion of the region facing the motor to the inside of the main body A plurality of reinforcing ribs formed, and (f) a top plate-side heat insulating material provided inside the housing top plate, the top plate-side heat insulating material being substantially entirely along the protruding surface of each reinforcing rib. Formed and partially or entirely along each radiation arrangement area other than each reinforcing rib of the housing top plate It is urchin formed by portion configured along the radiation arrangement region, which is constituted of the balloon radiation disposed air guide path for the air guide part of the flow to the motor from the turbo fan.

  The ceiling-embedded air conditioner according to the present invention is provided in (a) a ceiling-embedded air conditioner body having a housing top plate, and (b) a ceiling-embedded air conditioner body. A turbo fan for blowing air, (c) a motor for driving the turbo fan, (d) a heat exchanger erected so as to surround the turbo fan, and (e) an inside of the heat exchanger in the casing top plate A plurality of reinforcing ribs formed radially and projecting from the outer peripheral portion of the region facing the motor to the outside of the main body, and (f) the top plate side provided inside the case top plate The top plate side heat insulating material is formed so that substantially the whole is along the surface other than each reinforcing rib, and so that it is along part or all of each reinforcing rib portion of the housing top plate. The part formed along each reinforcing rib part is blown from the turbofan. And it is obtained by constituting the radiation arrangement air guide path for the air guide part of the flow to the motor.

  In the present invention, the wind guide cover is provided inside the hub, and the wind guide cover is formed so that the height position of the lower end opening of the peripheral surface portion is located below the lower end surface of the motor. The air that has flowed into the motor can be reliably guided to the lower end surface of the motor. Thereby, the whole surface of a motor can be cooled. As a result, the motor cooling efficiency is improved, the motor failure due to heat generation can be prevented, and a highly reliable ceiling-embedded air conditioner can be obtained.

  Moreover, since the opening hole which discharges | releases air to a fan internal air path is provided in the main plate vicinity of the peripheral surface part of a hub, it can prevent that the air which flows out into a fan internal air path from an opening hole interferes with a fan suction flow. For this reason, the shear disturbance of the fan suction flow is suppressed, and the noise caused by the blades passing through the turbulent flow can be reduced. Further, it is possible to prevent an increase in noise due to deterioration of the blowing efficiency due to interference with the fan suction flow.

  In addition, the hub has a substantially double structure, and the opening hole is provided in the vicinity of the main plate on the peripheral surface portion of the hub. As described above, from the motor side air passage of the hub to the fan internal air passage. The distance is extended and the noise is attenuated. As a result, it is possible to reduce the leakage of motor operation sound such as electromagnetic abnormal sound and bearing rotation sound emitted from the motor to the outside. Moreover, it is possible to obtain a ceiling-embedded air conditioner that can provide a comfortable environment for the resident with low noise.

  Further, similarly to the attenuation of noise, the flow velocity of the air flowing out from the opening hole into the fan internal air passage is also attenuated, so that it is possible to reliably prevent a decrease in the flow rate of the fan blowing flow and to prevent an increase in noise due to the deterioration of the blowing efficiency. In addition, due to the effect of reducing the flow rate of the fan blowing flow, a sufficient amount of motor cooling air can be secured and the motor can be effectively cooled.

  In addition, the present invention provides a reinforcing rib on the casing top plate and guides part of the blowout flow from the turbo fan to the motor by the top plate side heat insulating material and the reinforcing rib provided inside the casing top plate. Since the radiating arrangement air guide passage is formed, first, the strength of the casing top plate can be increased by the reinforcing rib, so that the casing top board 1b can be thinned and lightened. As a result, the air flow rate can be increased, the cooling efficiency can be improved, and the motor can be prevented from being damaged.

Embodiment 1 FIG.
Hereinafter, a ceiling-embedded air conditioner according to Embodiment 1 of the present invention will be described with reference to FIGS.
1 is an external perspective view of the air conditioner of the present invention, FIG. 2 is a longitudinal sectional view showing the inside of the air conditioner of FIG. 1, and FIG. 3 shows the inside of the air conditioner main body 1 of FIG. 2 is a horizontal sectional view taken along line XX in FIG. 2, FIG. 4 is an enlarged sectional view in the vicinity of the turbo fan 3 in FIG. 2, and FIG. 5 is a turbo mounted in the ceiling-embedded air conditioner 1 of the present invention. FIG. 6 is a perspective view of the fan 3, FIG. 6 is a perspective view of the turbo fan 3 of FIG. 5 turned upside down, and FIG. 7 is a perspective view of the air guide cover 18 disposed on the turbo fan 3.

  In FIG. 1, a ceiling-embedded air conditioner body 1 is embedded in a ceiling of a room 15 in a state where a substantially rectangular decorative panel 2 provided below the ceiling-embedded air conditioner body 1 is visible. Yes. Near the center of the decorative panel 2 is formed along a substantially rectangular suction grille 2a communicating with an air suction port 11a (see FIG. 2) to the ceiling-embedded air conditioner body 1 and each side of the decorative panel 2. The panel outlet 2b communicates with the main body outlet 16a (see FIG. 2), and each panel outlet 2b includes a wind vane 2c to form a ceiling-embedded air conditioner.

  As shown in FIGS. 2 and 3, the casing of the air conditioner body 1 is formed of a casing side plate 1a and a casing top plate 1b attached to a portion surrounded by the casing side plate 1a. The case side plate 1a and the case top plate 1b are made of sheet metal members. Moreover, the heat insulating material 1c is affixed on the surface inside the air conditioner main body 1 of at least a part of the case side plate 1a and the case top plate 1b, thereby constituting an air passage wall surface. Inside the air conditioner main body 1, a centrifugal fan provided with a motor 4 disposed so that the rotation shaft 4 a is orthogonal to the casing top plate 1 b, a turbo fan 3 driven to rotate by the motor 4, and a turbo fan 3 and a substantially C-shaped heat exchanger 6 erected so as to surround 3.

  Under the heat exchanger 6, a drain pan 12 formed of a foam material and an electrical component box 13 for storing electronic components such as a control board are disposed. Further, the two end portions 6a of the substantially C-shaped heat exchanger 6 are connected by a heat exchanger connecting plate 7 and are formed in a substantially rectangular shape as a whole. As shown in FIG. 3, a gap is formed between the heat exchanger connecting plate 7 and the side plate-side heat insulating material 1d on the outer side (the case side plate 1a side). And a drain pan 12 to form a pipe storage space 10. 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.

  The centrifugal blower includes a turbo fan 3 and a bell mouth 5 that forms a suction air passage 23 a to the turbo fan 3. The turbo fan 3 covers the motor 4 and extends downward from the periphery of the upper opening surface of the hub 3c so as to face the housing top plate 1b. A substantially ring-shaped main plate 3b having a plurality of blades 3a attached to the surface opposite to the surface facing the body top plate 1b, and a shroud 3g that faces the main plate 3b and constitutes a guide flow path to the blade 3a. And. The hub 3 c has an upper end formed integrally with the main plate 3 b and a lower end fixed to the rotating shaft 4 a of the motor 4. Here, the hub 3c includes a hollow conical cylindrical peripheral surface portion 3ca that is reduced in diameter from the inner peripheral portion of the main plate 3b and a flat surface portion 3cb that extends from the lower end opening of the peripheral surface portion 3ca toward the motor shaft 4a. And a cylindrical portion 3cc extending in the direction of the motor shaft 4a from the inner periphery of the plane portion 3cb. In addition, a plurality of opening holes 3d are formed in the circumferential surface portion 3ca at concentric positions near the main plate 3b. The hub 3c having such a configuration is fixed to the motor rotating shaft 4a by the cylindrical portion 3cc. In this fixed state, the gap E1 between the main plate 3b and the top plate-side heat insulating material 1e formed integrally with the hub 3c is a predetermined distance. The dimensions are designed to be

  Further, an air guide cover 18 is provided inside the hub 3c of the turbo fan 3 (on the motor 4 side). The air guide cover 18 forms a motor side air passage 3f between the motor 4 and the air flowing into the motor side air passage f from the gap E1 formed between the housing top plate 1b and the main plate 3b. As shown in FIG. 7, the cross-sectional area of the motor-side air passage 3f is directed from the inner peripheral portion of the flange portion 18a toward the lower end opening 18b, as shown in FIG. And a hollow conical cylinder-shaped peripheral surface portion 18c reduced in diameter so as to be small. The peripheral surface portion 18c is formed with substantially the same inclination as the peripheral surface portion 3ca of the hub 3c, and the gap E2 between the peripheral surface portion 3ca and the peripheral surface portion 3ca of the hub 3c is arranged at a predetermined interval. The air guide cover 18 is formed such that the height position of the lower end opening 18b of the peripheral surface portion 18c is located below the lower end surface 4b of the motor 4, and the air flowing into the motor side air passage 3f is The configuration is such that the air is guided to the entire motor 4. The air guide cover 18 having such a configuration is made of a metal member having high thermal conductivity such as aluminum or plated steel plate, and is suspended and fixed to the main plate 3b by a flange portion 18a by welding or the like. Is rotated together with the turbo fan 3.

Next, the operation at the time of operation of the ceiling-embedded air conditioner configured as described above will be described.
When the air conditioner is operated, when the motor 4 is driven and the turbo fan 3 rotates in the direction of arrow A (see FIGS. 3, 5 and 6), the air in the room 15 is sucked in from the suction grill 2a as indicated by the arrow B, and the filter 14 Then, after dust and the like are removed, it passes through the bell mouth 5 and is sucked into the turbo fan 3. Thereafter, the air C1 blown from the blower outlet 3i of the turbo fan 3 is heated or cooled while passing through the heat exchanger 6, and the air flow direction is controlled by a wind vane 2c rotated by a vane motor (not shown) while the air flow direction is controlled. Air-conditioning is performed from the outlet 2b to the room 15. During cooling, the condensed water generated by the condensation of the air in the room 15 by the heat exchanger 6 is discharged to the outside of the air conditioner body 1 by the drain pump 17.

  4, the flow B sucked into the turbo fan 3 includes a flow C1 flowing from the turbo fan 3 toward the heat exchanger 6, a main plate 3b, a top plate side heat insulating material 1e, 3d, flows into the motor-side air passage 3f, flows around the motor 4, passes through the lower end opening 18b of the air guide cover 18, and then passes through the gap E2 between the hub 3c and the air guide cover 18 to open the hole 3d. Is discharged toward the fan internal air passage 3e and becomes a flow C2 that merges with the fan suction flow B.

  In this flow C2, first, the air that passes through the gap E1 and flows into the motor side air passage 3f (motor 4 side) inside the air guide cover 18 becomes an air flow toward the lower end opening 18b. Here, since the air guide cover 18 is formed so that the height position of the lower end opening 18b of the peripheral surface portion 18c is located below the lower end surface of the motor 4, the air flowing into the motor side air passage 3f is removed. The air can be surely guided to the lower end surface 4b of the motor 4. Thereby, the whole surface of the motor 4 can be cooled, and the winding temperature inside the motor 4 and the heat of the element can be radiated.

  The air that has cooled the surface of the motor 4 flows out from the lower end opening 18b of the air guide cover 18, contacts the flat surface portion 3cb of the hub 3c, is guided upward through the gap E2, and is fanned from the opening hole 3d. It is discharged toward the internal air passage 3e. Here, since the opening hole 3d is provided on the main plate 3b side (near the main plate 3b) of the peripheral surface portion 3ca of the hub 3c, the air flowing out from the opening hole 3d to the fan internal air passage 3e is separated from the fan suction flow B. Interference can be prevented. For this reason, the shear disturbance of the fan suction flow B is suppressed, and the noise caused by the blade 3a passing through the turbulent flow can be reduced. Further, it is possible to prevent an increase in noise due to the deterioration of the blowing efficiency due to the interference with the fan suction flow B.

  Further, the hub 3c has a substantially double structure, and the opening hole 3d is provided on the main plate 3b side of the peripheral surface portion 3ca of the hub 3c. Compared to the case where the opening hole that discharges to the side of the motor is provided near the side surface of the motor or the hub is partly double-structured and the height position where the opening hole is provided is low, the fan internal airflow The air path to the road 3e is long. For this reason, noise is attenuated, and driving noise such as electromagnetic abnormal noise and bearing rotation noise generated from the motor 4 can be reduced.

  Further, similarly to the attenuation of noise, the flow velocity of the air flowing out from the opening hole 3d to the fan internal air passage 3e is also attenuated. Therefore, it is possible to reliably prevent a reduction in the flow rate of the fan blowing flow C1 caused by the air flowing out from the opening hole 3d into the fan internal air passage 3e interfering with the fan suction flow B, and to prevent an increase in noise due to a deterioration in the blowing efficiency. it can. In addition, due to the effect of reducing the flow rate of the fan blow-off flow C1, a sufficient amount of motor cooling air can be secured and the motor 4 can be effectively cooled.

  Next, the dimensional design of each part of the turbofan 3 that can sufficiently exhibit the cooling effect and noise reduction effect of the motor 4 will be described with reference to FIGS. Note that the minimum gap distance between the wind guide cover 18 and the lower end of the motor 4 (the distance between the lower end of the motor 4 and the surface of the peripheral surface portion 18c in the perpendicular line extending from the lower end of the motor 4 toward the surface of the peripheral surface portion 18c of the wind guide cover 18). ) K, the area G5 of the blower outlet 3i of the turbo fan 3, the circumferential opening area G1 at the interval E2 between the air guide cover 18 and the hub 3c (the air guide cover 18 and the hub 3c are surrounded by a plane perpendicular to the peripheral surface portion 3ca). The opening area when cutting into a shape), and the total opening area G4 of the opening hole 3d (the total area of each opening hole 3d).

FIG. 8 is a diagram showing the relationship between the minimum clearance gap k between the air guide cover 18 and the lower end of the motor 4 and the motor cooling efficiency. The motor cooling efficiency is a ratio between (h1−h2) and h1 when the motor temperature h1 when there is an opening hole 3d and the motor temperature h2 when there is no opening hole 3d.
From FIG. 8, the minimum gap interval k is 8 mm or more at which the air guide cover 18 does not collide with the motor 4 when the motor rotation shaft 4a is swayed at the starting point during transportation, and the motor cooling efficiency tends to deteriorate rapidly. It can be seen that the thickness is preferably 25 mm or less. By adopting this size, sufficient air flows on the motor surface, stable motor cooling efficiency can be obtained, and damage due to motor heat generation can be prevented.

FIG. 9 is a diagram showing a relationship between G4 / G1 (ratio of the total opening area G4 and the circumferential opening area G1) and the motor cooling efficiency.
As shown in FIG. 9, if G4 / G1 is 40% or more, the ventilation resistance in the flow path from the gap E2 between the air guide cover 18 and the hub 3c to the opening hole 3d of the hub 3c is not too large, and the air flows at the minimum. The motor cooling efficiency can be obtained stably and high, and the motor 4 can be prevented from being damaged by heat generation.

FIG. 10A is a diagram showing the relationship between G4 / G5 (the ratio between the turbo fan outlet area G5 and the total opening area G4) and the noise value, and FIG. 10B is the diagram showing G4 / G5 (turbo fan blowing area). It is a figure which shows the relationship between a motor cooling efficiency and the ratio of the exit area G5 and the total opening hole area G4.
From FIG. 10A, it can be seen that if G4 / G5 is 10% or less, the discharge flow from the opening hole 3d does not interfere with the suction flow B and the noise level is low. Further, FIG. 10B shows that the motor cooling efficiency can be stably obtained when G4 / G5 is 0.5% or more. Thereby, if G4 / G5 is set to 0.5% or more and 10% or less, the motor cooling efficiency can be stably obtained with low noise.

  As described above, by adopting a dimensional design that maintains the relationship between the corresponding components (the air guide cover 18 and the motor 4, the air guide cover 18 and the hub 3c, the opening hole 3d and the fan outlet 3i), the noise can be reduced. Damage to the motor 4 due to heat generation can be prevented, and a quiet and high-quality ceiling-embedded air conditioner can be obtained.

  FIG. 11 is a frequency characteristic diagram during operation of the air conditioner of the present invention, and shows a comparison result with the conventional one. The horizontal axis represents frequency, and the vertical axis represents noise value SPL. The experimental results are a result of comparison between the configuration of the present invention and the conventional configuration (having a single hub structure and an opening hole in the vicinity of the motor side surface of the hub for releasing air inside the hub to the outside of the hub). . From FIG. 11, it can be confirmed that electromagnetic noise generated from the motor 4, bearing rotation noise, and the like can be reduced.

FIG. 12 is a relationship diagram between the air flow rate and noise during operation of the air conditioner of the present invention, and shows a comparison result with the prior art. The abscissa indicates the air flow rate and the ordinate indicates the noise value.
From FIG. 12, when the air flow rate is the same, the configuration of the present invention is the conventional configuration (the hub has a single structure, and an opening hole for releasing the air inside the hub to the outside of the hub is provided near the side of the motor of the hub. It was confirmed that noise could be reduced compared to

  As described above, according to the first embodiment, the air guide cover 18 is provided on the inner side (motor 4 side) of the hub 3c, and the height position of the lower end opening 18b of the peripheral surface portion 18c is the motor 4 in the air guide cover 18. Therefore, the air flowing into the motor-side air passage 3f can be reliably guided to the lower end surface 4b of the motor 4. Thereby, the whole surface of the motor 4 can be cooled, and the winding temperature inside the motor 4 and the heat of the element can be radiated. As a result, the motor cooling efficiency is improved, the motor failure due to heat generation can be prevented, and a highly reliable ceiling-embedded air conditioner can be obtained.

  Further, since the opening hole 3d for releasing air to the fan internal air passage 3e is provided on the main plate 3b side of the peripheral surface portion 3ca of the hub 3c, the air flowing out from the opening hole 3d to the fan internal air passage 3e becomes the fan suction flow B. Can be prevented from interfering with. For this reason, the shear disturbance of the fan suction flow B is suppressed, and the noise caused by the blade 3a passing through the turbulent flow can be reduced. Further, it is possible to prevent an increase in noise due to the deterioration of the blowing efficiency due to the interference with the fan suction flow B.

  Further, the hub 3c has a substantially double structure as a whole, and the opening hole 3d is provided on the main plate 3b side of the peripheral surface portion 3ca of the hub 3c, so that the motor side air passage of the hub 3c as described above. The distance from 3f to the fan internal air passage 3e is extended, and the noise is attenuated. As a result, it is possible to reduce the leakage of motor operation noise such as electromagnetic noise generated from the motor 4 and bearing rotation noise from the motor 4 as compared with a hub having a single structure or partly having a double structure. As a result, it is possible to obtain a ceiling-embedded air conditioner that can provide a comfortable environment for the occupants with low noise.

  Further, similarly to the attenuation of noise, the flow velocity of the air flowing out from the opening hole 3d to the fan internal air passage 3e is also attenuated. Therefore, it is possible to reliably prevent a reduction in the flow rate of the fan blowing flow C1 caused by the air flowing out from the opening hole 3d into the fan internal air passage 3e interfering with the fan suction flow B, and to prevent an increase in noise due to a deterioration in the blowing efficiency. it can. In addition, due to the effect of reducing the flow rate of the fan blow-off flow C1, a sufficient amount of motor cooling air can be secured and the motor 4 can be effectively cooled.

  Further, since the peripheral surface portion 18c of the air guide cover 18 is formed in a hollow conical cylindrical shape whose diameter is reduced so that the cross-sectional area of the motor side air passage 3f becomes smaller toward the lower end opening 18b, the motor side air passage 3f. The air flow inside rises toward the lower end opening 18b. As a result, it is possible to effectively cool the whole from the upper part of the motor 4 to the lower end surface 4b of the motor 4 that has been insufficiently cooled.

  In addition, by designing the corresponding components so that the minimum gap k is 8 mm or more and 25 mm or less, G4 / G1 is 40% or more, and G4 / G5 is 0.5% or more and 10% or less. In addition, it is possible to prevent damage due to heat generation of the motor 4 with low noise, and it is possible to obtain a quiet and high-quality ceiling-embedded air conditioner.

  Further, since the wind guide cover 18 is made of a metal member having high thermal conductivity such as aluminum or plated steel plate, the heat of the heated air around the motor is transmitted to the wind guide cover 18, and the wind guide cover 18. Since it rotates integrally with the turbo fan 3, the amount of air passing through it while contacting the surface of the wind guide cover 18 is increased compared to the case where the wind guide cover 18 is provided so as not to rotate, and heat dissipation is promoted. Therefore, a high cooling effect of the motor 4 can be obtained. As a result, failure due to heat generation of the motor 4 can be further prevented, and a highly reliable ceiling-embedded air conditioner can be obtained.

  Further, since the opening hole provided in the fixing member for the motor 4, that is, the opening hole 3d of the hub 3c is arranged on the bottom side (that is, the main plate 3b side) instead of the top side of the truncated cone shape, Compared to the case where the opening hole 3d is to be secured near the lower side surface or near the lower end of the conventional hub, the area of the member (hub 3c) between the adjacent opening holes 3d can be increased, so that high strength against the rotational torque of the motor 4 is obtained. be able to.

  In the first embodiment, the case where the peripheral surface portion 18c of the air guide cover 18 and the peripheral surface portion 3ca of the hub 3c are substantially parallel is illustrated, but as shown in FIG. 13, the peripheral surface portion 18c of the air guide cover 18 is provided. It is good also as a structure which bent 18m along the outer peripheral surface by the side of the motor 4, and provided the cylindrical part 18d. In the case of this shape, the air that has flowed into the air guide cover 18 on the side of the motor 4 can be made to follow the surface of the motor 4 with certainty, so that the motor cooling efficiency can be further improved. Further, similarly to the above, it is possible to obtain a highly-reliable ceiling-embedded air conditioner that can reduce electromagnetic abnormal noise, bearing rotation noise, and the like and is quiet and can prevent the motor 4 from being damaged.

Embodiment 2. FIG.
Hereinafter, a ceiling-embedded air conditioner according to Embodiment 2 of the present invention will be described with reference to FIGS.
FIG. 14 is a longitudinal sectional view showing the inside of the air conditioner according to Embodiment 2 of the present invention, FIG. 15 is a horizontal sectional view showing the inside of the air conditioner main body 1 shown in FIG. FIG. 17 is an enlarged view of the vicinity of the turbo fan 3, and FIG. 17 shows an outline when the fan swings around the fixed point of the hub 3c and the motor rotating shaft 4a during transportation or the like and contacts the top plate side heat insulating material 1e. FIG. In these drawings, the same parts as those in the first embodiment shown in FIGS.

  In the second embodiment, the flow rate that flows from the gap E1 to the motor 4 side into the ring-shaped fan main plate equivalent region 1f facing the main plate 3b of the top plate-side heat insulating material 1e of the first embodiment shown in FIG. The flow straightening part 1g which restricts the above is formed, thereby reducing the flow rate discharged from the opening hole 3d toward the fan internal air passage 3e to reduce noise. In addition, this rectification | straightening part 1g is integrally formed by the top-plate-side heat insulating material 1e.

Hereinafter, the shape of the rectifying unit 1g will be specifically described with reference to FIGS. FIG. 18 is a perspective view of the heat insulating material 1c as viewed from the fan-side equivalent portion.
The rectifying portion 1g is formed in a substantially ring shape, and is configured such that the distance in the height direction from the main plate 3b becomes shorter from the outer peripheral portion toward the inner peripheral portion side. Further, the minimum gap E1 between the rectifying unit 1g and the main plate 3b and the gap D1 in the height direction between the main plate 3b and the top plate-side heat insulating material 1e are formed to have a predetermined relationship. Further, as shown in FIG. 17, the side surface 1h of the rectifying unit 1g is brought into contact with the rectifying unit 1g when the turbo fan 3 is swung around the fixing unit 3h between the hub 3c and the motor rotating shaft 4a during transportation, as shown in FIG. It is formed with an inclination that does not make point contact with the outer peripheral edge of the turbofan 3. Further, the shape of the inclined side surface 1h is specifically a polygonal shape that makes a line or surface contact with the outer peripheral edge of the turbofan 3 as shown in FIG.

  By providing the rectifying unit 1g having such a configuration, the flow C2 which is blown out from the outlet 3i of the turbo fan 3 and reverses in the direction of the gap E1 between the main plate 3b and the top plate-side heat insulating material 1e is excessively increased in the motor side wind. It can suppress going to the road 3f. For this reason, the flow rate of the air flowing out from the opening hole 3d to the fan internal air passage 3e can be reduced, interference with the fan suction flow B and occurrence of shearing turbulence can be suppressed, and noise can be reduced.

Next, the dimension design of the rectifying unit 1g that can sufficiently exhibit the cooling effect and noise reduction effect of the motor 4 will be described with reference to FIG.
FIG. 19A shows the same feed with respect to E1 / D1 (the ratio of the minimum gap E1 between the rectifying unit 1g and the main plate 3b and the height direction gap D1 between the top plate-side heat insulating material 1e and the main plate 3b). The figure which showed the change of the noise value at the time of air volume, FIG.19 (b) is the figure which showed the motor cooling efficiency at the time of the same ventilation volume with respect to E1 / D1.

  If E1 / D1 is too small, the airflow resistance of the gap D1 is large, so that air does not flow and noise is reduced as shown in FIG. 19A, but on the other hand, the amount of inflow to the surface of the motor 4 is reduced. The motor 4 cannot be sufficiently cooled, and the motor cooling efficiency is deteriorated as shown in FIG. On the other hand, if E1 / D1 is too large, air flows excessively in the gap D1 and noise increases as shown in FIG. 19 (a). On the other hand, sufficient air flows on the surface of the motor 4. Therefore, the cooling efficiency of the motor 4 can be increased. Therefore, E1 / D1 is set to 0.3 to 0.7 in this example in consideration of the cooling effect of the motor 4 and the noise reduction effect. As a result, the motor cooling efficiency is improved, the failure due to the heat generation of the motor 4 can be prevented, and the noise value can also be reduced.

  As described above, according to the second embodiment, the same operational effects as those of the first embodiment can be obtained, and the rectifying unit 1g having the above shape is provided, so that the air is blown out from the outlet 3i of the turbo fan 3 and the main plate 3b. It is possible to prevent the flow C2 that reverses in the direction of the gap E1 between the top plate side heat insulating material 1e and the motor 4 from being excessively directed. For this reason, the flow rate of the air flowing out from the opening hole 3d to the fan internal air passage 3e can be reduced, interference with the fan suction flow B and occurrence of shearing turbulence can be suppressed, and noise can be reduced.

  Moreover, even if the main plate 3b of the turbofan 3 contacts the top plate side heat insulating material 1e during transportation or the like, it is not a point contact as in the conventional case but a line or surface contact as shown in FIG. Stress concentration on the fan main plate 3b can be avoided, and the turbo fan 3 can be prevented from being damaged. Further, since the heat insulating material 1c constituting the air path can be used and the rectifying portion 1g can be integrally formed at the time of forming the heat insulating material 1c, there is an advantage that an assembling process can be omitted without the necessity of separately forming parts. As a result, it is possible to obtain a ceiling-embedded air conditioner that can prevent a motor failure by improving the motor cooling efficiency, has high reliability, and can provide a comfortable environment for the occupant with low noise.

  Moreover, since E1 / D1 is set to 0.3 to 0.7, a ceiling-embedded air conditioner having both the cooling effect of the motor 4 and the noise reduction effect can be obtained.

  The rectifying unit 1g has been described by exemplifying a case in which the side surface shape is a polygonal shape in this example, but is not limited to this, and the shape is in line contact or surface contact with the outer peripheral edge of the turbofan 3. And may be formed as shown in FIG.

  FIG. 20 is a perspective view illustrating another example of the shape of the rectifying unit 1g. In this example, the side surface 1h of the rectifying unit 1g is configured to have a truncated cone shape. Even in this case, since at least the main plate 3b and the side surface 1h are in line contact, stress concentration on the main plate 3b due to impact can be avoided, and damage to the turbo fan 3 can be prevented. Further, even in this shape, if E1 / D1 = 0.3 to 0.7 as described above, a ceiling-embedded air conditioner having both the cooling effect of the motor 4 and the noise reduction effect can be obtained. it can.

  Moreover, although the case where the rectifying unit 1g is configured by the top plate side heat insulating material 1e in the present example has been illustrated and described, for example, as shown in FIG. 21, for example, the fan main plate equivalent region 1f portion of the housing top plate 1b May be modified to constitute the rectifying unit 1g. In this case, even if there is no top plate-side heat insulating material 1e inside the air passage of the top plate 1b, the cost can be reduced because it can be molded integrally with the housing top plate 1b.

Embodiment 3 FIG.
Hereinafter, a ceiling-embedded air conditioner according to Embodiment 3 of the present invention will be described with reference to FIGS.
22 is a longitudinal sectional view showing the inside of the air conditioner according to Embodiment 3 of the present invention, and FIG. 23 is a perspective view of the current plate 19 of FIG. In these drawings, the same parts as those in the first embodiment shown in FIGS.

  The third embodiment has a shape corresponding to the rectifying unit 1g instead of forming the rectifying unit 1g on the top plate side heat insulating material 1e in the second embodiment shown in FIG. The rectifying plate 19 having the same function as that of the rectifying unit 1g is mounted so as to be replaceable, and other configurations are the same as those of the second embodiment. The rectifying plate 19 is made of a sheet metal member or a plastic member, and is fixed to the top plate side heat insulating material 1e or the case top plate 1b by screws or the like.

  By configuring in this way, the same effects as in the first and second embodiments can be obtained, and the rectifying plate 19 can be replaced. When the ventilation resistance changes in part, the amount of flow in the gap E2 between the main plate 3b and the rectifying plate 19 can be adjusted to a flow rate suitable for the model by simply replacing the rectifying plate 19.

  Note that the rectifying plate 19 is not limited to the illustrated shape, as in the case of the rectifying unit 1g, and may be formed as shown in FIG.

  In this example, the case where the side surface 1h of the current plate 19 is configured in a truncated cone shape is shown. Even in this case, since at least the main plate 3b and the side surface 1h are in line contact, stress concentration on the main plate 3b due to impact can be avoided, and damage to the turbo fan 3 can be prevented. Moreover, if E1 / D1 = 0.3 to 0.7 as described above, a ceiling-embedded air conditioner having both the cooling effect of the motor 4 and the noise reduction effect can be obtained.

Embodiment 4 FIG.
Hereinafter, a ceiling-embedded air conditioner according to Embodiment 4 of the present invention will be described with reference to FIGS.
25 is a longitudinal sectional view showing the inside of an air conditioner according to Embodiment 4 of the present invention, and is a YY sectional view of FIG. 26 is a sectional view taken along the line ZZ in FIG. 27 is an external view of the top plate in the direction of arrow S in FIG. 25, FIG. 28 is a partially enlarged view near the turbo fan 3 in FIG. 25, and FIG. 29 is a cross-sectional perspective view taken along line V-V in FIG. FIG. 30 is a partial cross-sectional side view of the motor 4, and FIG. 31 is a schematic diagram of a driving substrate built in the motor 4. FIG. 32 is a diagram showing measurement experiment results of the motor surface temperature and the noise value according to the positional relationship between the radiation arrangement air guide path 1k and the turbo fan 3 of FIG. In these drawings, the same parts as those in the first embodiment shown in FIGS.

  In the fourth embodiment, a plurality of reinforcing ribs 1i are provided on the casing top plate 1b of the first embodiment shown in FIG. 1 to improve the strength of the casing top plate 1b. A radiation arrangement air guide path 1k that guides the flow C2 to the motor 4 is formed by the top board side heat insulating material 1ea provided on the top board 1b to improve the cooling efficiency of the motor 4.

  A plurality of reinforcing ribs 1i project radially inward from the outer peripheral portion of the region facing the motor 4 toward the housing side plate 1a in the region corresponding to the inside of the heat exchanger 6 in the housing top plate 1b. Is formed. On the inner surface side of the case top plate 1b and the case side plate 1a on which such reinforcing ribs 1i are formed, a heat insulating material 1ca formed in a substantially box shape as a whole is disposed to constitute an air passage wall surface. The heat insulating material 1ca includes a top plate side heat insulating material 1ea along a part or all of the inner surface of the housing top plate 1b and a side plate side heat insulating material 1d similar to the above. In this Embodiment 4, it has one of the characteristics in the top-plate-side heat insulating material 1ea, and the shape of the top-plate-side heat insulating material 1ea will be described in detail below.

  Although the top-plate-side heat insulating material 1ea is supposed to be along a part or all of the inner surface of the case top plate 1b, in this example, it is formed so as to be along a part of the case top plate 1b. That is, a reinforcing rib 1i is formed on the housing top plate 1b so as to protrude toward the inside of the main body, and the top plate-side heat insulating material extends along the entire protruding surface 1ia with reference to the protruding surface 1ia (see FIG. 29). 1ea is formed. A plurality of radiation arrangement regions (that is, a triangular region (a long hole-shaped region at one location) sandwiched between the reinforcing ribs 1i adjacent to each other on the housing top plate 1b) projecting outward from the projecting surface 1ia Of these, a part (several places) of the radiation arrangement region 1 ib is formed so as to protrude along the top plate side heat insulating material 1 ea. In this example, as shown in FIG. 26, it forms along 4 radiation | emission arrangement | positioning area | regions 1ib, and forms other parts flatly along the radiation | emission arrangement | positioning area | region 1ib. Therefore, as shown in FIGS. 26 and 29, the radiation arrangement regions 1ib other than the four radiation arrangement regions 1ib are covered with the flat portion of the top-plate-side heat insulating material 1ea and hidden. .

  The portion corresponding to the radiation arrangement region 1 ib (see FIG. 29) has a clearance distance between the turbofan main plate 3b and a clearance between the reinforcing rib 1i and the turbofan main plate 3b due to the top plate-side heat insulating material 1ea thus configured. A radial arrangement air guide path 1k larger than the distance is formed.

Next, the configuration of the motor 4 to be cooled and the mounting of the motor 4 will be described with reference to FIGS. 30 and 31. FIG.
The motor 4 has a configuration in which a motor-embedded board 4h on which a drive circuit 4d and a control circuit 4e are mounted is mounted on a housing top plate side (opposite side of the turbofan) inside the motor. Specifically, a DC motor It consists of A motor built-in substrate 4h and a rotor 4g are fixed to the rotating shaft 4a inside the motor 4, and a stator 4f including a winding, a core, and the like is disposed around the rotor 4g. The stator 4f is molded and integrated with a molding material 4k. The rotor 4g is disposed in a hollow portion formed by the stator 4f, and the rotor 4g is rotated by a bearing 4i press-fitted into the end of the hollow portion and the bracket 4L. It holds freely and constitutes a DC motor. The rotor 4g is formed by forming a plastic magnet material into a cylindrical shape, and has N and S magnetic fields on the outer periphery.

  Further, the motor-embedded substrate 4h includes a Hall element 4j that detects the magnetic field of the rotor 4g and generates a rotation speed signal, a control circuit 4e that receives the rotation speed signal and transmits a rotation speed command voltage, and a magnetic field of the stator 4f from the rotation speed command voltage. A drive circuit 4d for controlling the energization is mounted. A power element 4M is mounted on the drive circuit 4d of the motor built-in substrate 4h, and is in contact with the bracket 4L via an insulating plate and heat radiating silicone.

  The motor built-in substrate 4h is connected to the electronic substrate 25 in the electrical component box 24 of FIG. As shown in FIG. 31, the electronic board 25 is supplied with power from the AC / DC converter 25a that converts and boosts the voltage (ex200V) of the AC power supply 26 to DC voltage and supplies power to the drive circuit 4d and the control circuit 4e. A control circuit power supply 25b is mounted.

  In the motor 4 having such a configuration, during operation, the heat generation temperature of the power element 4M becomes higher than that of other portions such as the windings of the stator 4f, and heat is transferred via the heat radiating silicone, so that the temperature of the bracket 4L and the motor 4 The temperature of the side surface 4c on the case top side increases. Therefore, if the bracket 4L and the side surface 4c on the housing top plate side of the motor 4 cannot be radiated, the power element 4M is damaged by heat generation, and the motor 4 fails. That is, in order to prevent failure of the motor 4, cooling of the bracket 4L and the side surface 4c on the housing top plate side of the motor is mainly required.

  As another example of the motor 4, when the drive circuit 4d and the control circuit 4e are DC motors mounted on the electronic board 25 of the electrical component box 24 outside the motor, the motor 4 is transmitted from the stator 4f having the highest temperature. The rotating shaft 4a is heated by heat, the lubricating oil of the bearing 4i deteriorates due to high temperature, and the bearing 4i stops seizing and breaks down. That is, also in this case, in order to prevent the failure of the motor 4, it is necessary to mainly cool the bearing equivalent portion 4P (see FIG. 28) on the surface of the motor and the bracket 4L with which the bearing 4i contacts. The bearing equivalent portion 4P indicates a portion corresponding to the outer surface of the bearing 4i of the motor 4.

Next, the cooling effect of the motor 4 by providing the radiation arrangement air guide path 1k will be described.
In the top plate-side heat insulating material 1ea, the portion that is formed along the radiation arrangement region 1ib and constitutes each radiation arrangement air guide channel 1k is formed flatly in accordance with the other portion (that is, the protruding surface 1ia of the reinforcing rib 1i). The gap distance E1 is larger than the (part). For this reason, it is possible to increase the flow rate when a part C2 of the blowout flow of the turbo fan 3 is attracted to the motor 4, and it is also possible to increase the flow velocity. Therefore, the cooling effect of the motor 4 can be enhanced.

  Further, the flow C2 attracted in the direction of the motor 4 while turning between the main plate 3b and the top plate-side heat insulating material 1ea abuts against the side surface 1ka of the radial arrangement air guide path 1k as shown in FIG. Therefore, the side surface 4c of the motor 4 on the housing top plate side and the bracket 4L on the housing top plate side top surface of the motor 4 can be cooled.

  Here, in this example, the top-plate-side heat insulating material 1ea is set so as to be along only a part of the radiation arrangement regions 1ib among the radiation arrangement regions 1ib of the housing top plate 1b, and not along all the radiation arrangement regions 1ib. The reason for this is that, if it is formed so as to extend along the entire surface, there is a possibility of increasing noise.

  As shown in FIG. 28, the air C2 flowing into the motor side air passage 3f through the gap E1 between the main plate 3b and the top plate side heat insulating material 1eb flows around the motor 4 and then passes through the opening hole 3d. It is discharged toward the air passage 3e. At this time, since the air flow passes through the bearing equivalent portion 4P on the motor surface, the bearing equivalent portion 4P can be cooled, and the motor 4 can be sufficiently cooled to prevent damage. Further, since the motor 4 can be sufficiently cooled as described above, the turbo fan 3 can be rotated to the limit set temperature of the power element 4M. Thereby, it becomes possible to increase an air flow rate, and the heat exchange performance in the heat exchanger 6 can be improved. Furthermore, since the internal circuit loss of the power element 4M can be reduced, the motor efficiency is improved and energy saving is possible.

Next, the positional relationship between the radiation arrangement air guide path 1k and the turbofan 3 that can obtain a high cooling effect and noise reduction effect of the motor 4 will be described.
If the inner peripheral end 1 kb of the radial arrangement air guide path 1 k is separated from the motor 4, it is difficult to induce the flow to the housing top plate side surface 4 c and the bracket 4 L of the motor 4, and the cooling cannot be sufficiently performed. If the outer peripheral end 1kc of the radial arrangement air guide path 1k is too far outside the outer periphery of the turbofan 3, the blowout flow C1 itself, not the flow C2 passing through the gap E1 and going to the motor side air path 3f, is directly provided in the radial arrangement direction. It collides with the side surface 1ka of the air passage 1k and causes an increase in noise. Further, when the blowout flow C1 directly collides with the side surface 1ka of the radial arrangement air guide path 1k and the air flow is turned toward the motor 4, the amount of inflow to the motor 4 increases, and conversely the heat Since the amount of inflow into the exchanger 6 is reduced, an increase in the air volume is required to increase the heat exchange capacity, resulting in noise deterioration.

  In view of the above, the optimum position range of the inner peripheral end 1 kb and the outer peripheral end 1 kc of the radiation arrangement air duct 1 k that can exhibit both the cooling effect and the noise reduction effect will be examined.

  FIG. 32 (a) shows the relationship between the position of the inner peripheral end 1kb of the radial arrangement air guide path 1k and the surface temperature T1 of the bracket 4L arranged on the casing top plate side of the motor 4 after the same time operation. FIG. FIG. 32B is a diagram showing a relationship between the position of the outer peripheral end 1kc of the radial arrangement air guide path 1k and the noise value SPL1 when the air volume is the same. FIG. 32 (c) shows the relationship between the position of the outer peripheral end 1kc of the radial arrangement air guide path 1k and the surface temperature T1 of the bracket 4L disposed on the casing top plate side of the motor 4 after operation for the same time. FIG.

  The outer diameter L1 of the turbo fan 3, the distance L0 between the rotational axis center 4ac of the motor 4 and the outer peripheral end 1kc of the radial arrangement air guide path 1k, the inner peripheral end 1kb of the rotational axis center 4ac of the motor 4 and the radial arrangement air guide path 1k. When the distance L2 is 0 ≦ L2 ≦ 0.3 × L1 as shown in FIG. 32A, compared to when the radial arrangement air guide path 1k is not provided (L2 = 0.5 × L1). The motor 4 is sufficiently cooled. This is considered to be because the area of the side surface 1ka of the radiation arrangement air guide path 1k can be secured widely and the flow rate of air toward the motor 4 can be increased.

  Further, as shown in FIG. 32 (b), if L0 ≦ 0.6 × L1, the noise value is hardly deteriorated. Further, as shown in FIG. 32C, the motor 4 is sufficiently cooled if 0.5 × L1 ≦ L0, that is, if the outer peripheral end 1kc of the radiation arrangement air guide path 1k is outside the main plate 3b of the turbofan.

  Therefore, by designing the dimensions so that 0.5 × L1 ≦ L0 ≦ 0.6 × L1 and 0 ≦ L2 ≦ 0.3 × L1, the motor 4 is sufficiently cooled and the noise level is reduced. A high quality ceiling-embedded air conditioner can be obtained.

  As described above, according to the fourth embodiment, since the reinforcing rib 1i is formed on the housing top plate 1b so as to protrude toward the inside of the main body, the strength can be increased without increasing the height of the main body. As a result, the casing top plate 1b can be thinned, and the weight can be reduced. Further, the top plate side heat insulating material 1ea provided on the inner surface side of the housing top plate 1b forms the radiation arrangement air guide path 1k having a function of turning the flow C2 toward the motor 4, so that the motor 4 is effective. Therefore, it is possible to cool the motor and prevent the motor from being damaged.

  Moreover, since the heat insulating material (top plate side heat insulating material 1ea) is provided on the inner surface side of the case top plate 1b, the heat exchanger 6 is cooled during the cooling operation, the internal atmosphere of the main body is also cooled, and the air conditioner main body 1 Even when the temperature and humidity behind the ceiling is high, dew condensation on the surface of the housing top plate 1b can be prevented, and the floor surface is kept clean without the inconvenience of dripping water on the floor of the room. Can be used as is.

  In addition, both the cooling efficiency of the motor 4 and the suppression of deterioration of the noise value are both achieved by the design satisfying 0.5 × L1 ≦ L0 ≦ 0.6 × L1 and satisfying 0 ≦ L2 ≦ 0.3 × L1. Thus, a high-quality ceiling-embedded air conditioner capable of preventing damage due to heat generation of the motor 4 and reducing noise can be obtained.

  Further, since the motor-embedded board 4h on which the drive circuit 4d and the control circuit 4e are mounted is housed in the motor 4, the electrical product is compared with the case where the drive circuit 4d and the control circuit 4e are housed in the electrical product box 24. The box 24 can be made smaller and the bell mouth 5 and the main body suction air passage 11 are not partially blocked. Therefore, it is possible to reduce ventilation resistance and to prevent suction drift and to reduce noise.

  Note that the height position of the top surface of the motor 4 on the housing top plate 1b side (the surface of the bracket 4L of the motor 4) is lower than the height position of the surface of the top plate-side heat insulating material 1ea shown by the broken line in FIG. In the case of the turbo fan 3 side), a space is formed in the vicinity of the bracket 4L, and the flow C2 easily flows into the bracket 4L. Therefore, the cooling effect can be further enhanced. As a result, it is possible to obtain a ceiling-embedded air conditioner that is improved in motor efficiency and excellent in energy saving.

Embodiment 5. FIG.
The ceiling-embedded air conditioner according to the fifth embodiment of the present invention will be described below with reference to FIGS.

  33 and 34 show an example in which the reinforcing ribs 1i arranged radially in the fourth embodiment protrude outward from the main body, and FIG. 33 shows the case top plate 1b on the top plate side heat insulating material 1eb side. It is the figure seen from. 33 is substantially the same shape as FIG. 28. FIG. 34 is an external plan view of the housing top plate 1b. FIG. 35 is a cross-sectional perspective view taken along line VV in FIG. In these drawings, the same parts as those in the first embodiment shown in FIGS. 1 to 4 and the fourth embodiment shown in FIGS.

  In the fifth embodiment, the reinforcing ribs 1i arranged in a radial manner in the fourth embodiment are protruded not in the main body direction but in the main body outer direction. On the inner surface side of the case top plate 1b and the case side plate 1a on which such reinforcing ribs 1i projecting to the outside are formed, a heat insulating material 1cb formed in a generally box shape is disposed to constitute the air channel wall surface. is doing. The heat insulating material 1cb is composed of a top plate side heat insulating material 1ea along a part or all of the inner surface of the housing top plate 1b and a side plate side heat insulating material 1d similar to the above. In this Embodiment 5, it has one of the characteristics in the top-plate-side heat insulating material 1eb, and the shape of the top-plate-side heat insulating material 1eb will be described in detail below.

  Similarly to the fourth embodiment, the top plate-side heat insulating material 1eb is formed not along the entire case top plate 1b but along a part of the case top plate 1b. That is, a reinforcing rib 1i is formed on the housing top plate 1b so as to protrude to the outside of the main body as shown in FIG. 34, and the surface 1ic with reference to the surface 1ic (see FIG. 35) other than the portion where the reinforcing rib 1i is formed. A top plate-side heat insulating material 1eb is formed along the whole. And it forms so that the top-plate-side heat insulating material 1eb may protrude along a part (only several places) of the plurality of reinforcing ribs 1i protruding outward from the surface 1ic. In this example, as shown in FIG. 33, it forms along 4 reinforcement ribs 1i, and forms other parts flatly along the reinforcement rib 1i. Therefore, as shown in FIG. 33, the reinforcing ribs 1i other than the four reinforcing ribs 1i are covered and hidden by the flat portion of the top plate heat insulating material 1eb.

  In the heat insulating material 1eb configured as described above, the portion formed along the reinforcing rib 1i has a radial arrangement in which the gap distance from the turbofan main plate 3b is larger than the portion formed flat without being along the reinforcing rib 1i. A wind guide path 1k ′ is formed.

  With this configuration, as in the case where the radial arrangement air guide path 1k according to the fourth embodiment is provided, a part of the blowout flow of the turbo fan 3 due to weight reduction by the increase in strength and the radial arrangement air guide path 1k ′ is provided. C2 can be guided to the motor 4, and the side surface 4c and the bracket 4L of the motor 4 on the housing top plate side can be effectively cooled.

  In addition, the air flowing into the motor-side air passage 3f through the gap E1 between the main plate 3b and the top plate-side heat insulating material 1eb flows around the motor 4 and is then discharged from the opening hole 3d toward the fan internal air passage 3e. The At this time, since the air flow passes through the bearing equivalent portion 4P on the motor surface, the bearing equivalent portion 4P can be cooled, and the motor 4 can be sufficiently cooled to prevent damage. Further, since the motor 4 can be sufficiently cooled in this way, the fan 3 can be rotated to the limit set temperature of the power element 4M. Thereby, it becomes possible to increase an air flow rate, and the heat exchange performance in the heat exchanger 6 can be improved. Furthermore, since the internal circuit loss of the power element 4M can be reduced, the motor efficiency is improved and energy saving is possible.

  Moreover, since the inner surface side of the case top plate 1b is covered with the top plate side heat insulating material 1eb, it is possible to prevent dew condensation even if a part of the air cooled by the heat exchanger 6 flows into the motor 4. A ceiling-embedded air conditioner can be obtained.

  In the fourth embodiment, the dimensional design satisfying 0.5 × L1 ≦ L0 ≦ 0.6 × L1 and 0 ≦ L2 ≦ 0.3 × L1 is shown in FIG. However, the fifth embodiment is also effective.

1 is an external perspective view of a ceiling-embedded air conditioner according to Embodiment 1 of the present invention. It is a longitudinal cross-sectional view which shows the inside of the air conditioner of FIG. It is the horizontal sectional view in XX of FIG. 2 which showed the inside of the air conditioner of FIG. 1 and was seen from the top plate side. FIG. 3 is an enlarged cross-sectional view in the vicinity of a turbo fan 3 in FIG. 2. 2 is a perspective view (No. 1) of a turbo fan 3. FIG. FIG. 3 is a perspective view (No. 2) of a turbo fan 3; 3 is a perspective view of the air guide cover 18. FIG. It is a figure which shows the relationship between the minimum clearance gap k of the wind guide cover 18 and the motor 4, and motor cooling efficiency. It is a figure which shows the relationship between G4 / G1 (ratio of total opening area G4 and circumferential opening area G1) and motor cooling efficiency. It is a figure which shows the relationship between G4 / G5 (ratio of the turbofan blower outlet area G5 and the total opening area G4), a noise value, and data cooling efficiency. It is a frequency characteristic figure at the time of the air conditioner driving | operation in this invention. It is a related figure of the ventilation volume and noise at the time of the air conditioner driving | operation in this invention. FIG. 6 is an enlarged cross-sectional view in the vicinity of a turbo fan 3 showing another example of a wind guide cover 18. It is a longitudinal cross-sectional view which shows the inside of the ceiling embedded type air conditioner which concerns on Embodiment 2 of this invention. It is the horizontal sectional view which showed the inside of the air conditioner main body 1 of FIG. 14, and was seen from the top plate side. It is an enlarged view of the turbo fan 3 vicinity of FIG. It is a schematic diagram when the fan 3 swings and contacts the top-side heat insulating material 1e with the hub 3c and the fixed portion 3h of the motor rotating shaft 4a as a fulcrum during transportation of the turbo fan 3. It is the perspective view seen from the fan side equivalent part of the heat insulating material 1c. E1 / D1 (the ratio of the minimum gap E1 between the rectifying unit 1g and the main plate 3b and the height gap D1 between the top plate-side heat insulating material 1e and the main plate 3b) at the same air flow rate It is a figure showing change and motor cooling efficiency. It is the perspective view which showed another example of the shape of the rectification | straightening part 1g. It is the longitudinal cross-sectional view which showed another structural example of the rectification | straightening part 1g. It is a longitudinal cross-sectional view which shows the inside of the ceiling embedded type air conditioner which concerns on Embodiment 3 of this invention. It is a perspective view of the baffle plate 19 whose side surface 1h inclination shape is a polygonal shape. It is a perspective view of the baffle plate 19 whose side surface 1h inclination shape is truncated cone shape. It is a longitudinal cross-sectional view which shows the inside of the ceiling-embedded air conditioner which concerns on Embodiment 4 of this invention. It is a horizontal sectional view in ZZ of FIG. It is a top-plate external view of the arrow S of FIG. It is the elements on larger scale near the turbo fan 3 of FIG. It is a cross-sectional perspective view in VV of FIG. 3 is a partial cross-sectional side view of the motor 4. FIG. FIG. 3 is a schematic diagram of a driving board built in a motor 4. It is a figure which shows the measurement experiment result of the motor surface temperature and noise value according to the positional relationship of the radiation arrangement | positioning wind guide path 1k and the turbo fan 3 of FIG. It is the figure which looked at the housing | casing top plate 1b from the top plate side heat insulating material 1eb side in the ceiling embedded type air conditioner which concerns on Embodiment 5 of this invention. It is an external appearance top view of the housing | casing top plate 1b of the ceiling-embedded air conditioner which concerns on Embodiment 5 of this invention. It is a cross-sectional perspective view in VV of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ceiling-embedded air conditioner main body, 1a case side plate, 1b case top plate, 1c, 1ca, 1cb heat insulating material, 1e, 1ea, 1eb top plate side heat insulating material, 1f fan main plate equivalent area, 1g rectifying unit, 1h Side surface, 1i Reinforcement rib, 1ia Projection surface, 1ib Radiation arrangement area, 1k Radiation arrangement air guide channel, 1kb Inner end, 1kc Outer end, 3 Turbo fan, 3a Blade, 3b Main plate, 3c Hub, 3ca Outer surface part, 3cb Plane part, 3cc cylindrical part, 3d opening hole, 3e fan internal air passage, 3f motor side air passage, 3g shroud, 3h fixed part, 3i air outlet, 4 motor, 4a rotating shaft, 4ac rotating shaft center, 4b lower end of motor Surface, 4d drive circuit, 4e control circuit, 4h motor built-in board, 5 bell mouth, 6 heat exchanger, 18 air guide cover, 18a collar, 18b bottom opening, 18c peripheral surface, 19 rectification , 23a suction air passage, 23b fan blowing air duct.

Claims (21)

(A) a ceiling-embedded air conditioner body having a casing top plate;
(B) a motor disposed in the ceiling-embedded air conditioner main body so that a rotation axis is orthogonal to the casing top plate;
(C) A convex-shaped hub that covers the motor and fixes the rotation shaft of the motor, and extends from the periphery of the upper opening surface of the hub so as to face the top plate, and faces the housing top plate. A main plate having a plurality of blades attached to a surface opposite to the surface, and a shroud that opposes the main plate and constitutes a guide flow path of the blades, and sucks air sucked from the shroud side A turbo fan that blows out through a fan internal air passage formed on the opposite side of the motor side of
(D) provided on the motor side of the hub, forming a motor side air passage between the hub and the motor, and flowing into the motor side air passage through a gap formed between the housing top plate and the main plate. An air guide cover that guides the air toward the motor,
The wind guide cover includes a peripheral surface portion extending downward from the main plate side, and is formed such that a height position of a lower end opening of the peripheral surface portion is positioned below a lower end surface of the motor. The hub flows into the motor side air passage from the gap, and flows out from the lower end opening of the air guide cover and flows into the gap between the air guide cover and the hub and flows out to the fan internal air passage. A ceiling-embedded air conditioner having a plurality of opening holes.   The ceiling-embedded air conditioner according to claim 1, wherein the hub has a plurality of the opening holes formed in the vicinity of the main plate.   The ceiling embedding according to claim 1 or 2, wherein the peripheral surface portion of the wind guide cover is formed so that a cross-sectional area of the motor side air passage becomes smaller toward the lower end opening. Type air conditioner.   The ceiling according to any one of claims 1 to 3, wherein the hub and the peripheral surface portion of the wind guide cover are each formed in a truncated cone shape and are substantially the same in inclination. Embedded air conditioner.   The ceiling-embedded air conditioner according to any one of claims 1 to 3, wherein a peripheral surface portion of the wind guide cover has a cylindrical portion along an outer peripheral surface of the motor.   The minimum clearance gap k between the wind guide cover and the lower end of the motor, the blower outlet area G5 of the turbofan, the circumferential opening area G1 at the minimum clearance distance E2 between the wind guide cover and the hub, and the opening hole When the total opening area G4 is set, each of the corresponding gaps such that the minimum gap k is 8 mm or more and 25 mm or less, G4 / G1 is 40% or more, and G4 / G5 is 0.5% or more and 10% or less. The ceiling-embedded air conditioner according to any one of claims 1 to 5, wherein the air conditioner is formed so as to maintain a relationship between components.   The said wind guide cover is comprised by the metal member with high heat conductivity, and is being fixed so that it may rotate integrally with the said turbo fan. Embedded ceiling air conditioner.   8. The ceiling-embedded air conditioner according to claim 7, wherein the metal member is aluminum or a plated steel plate.   In the gap between the main plate and the fan main plate equivalent region facing the main plate of the casing top plate, a rectifying portion formed so that the gap with the main plate becomes shorter toward the center of the main plate is provided. The ceiling-embedded air conditioner according to any one of claims 1 to 8.   The side surface of the rectifying unit is inclined so as not to make point contact with the outer peripheral edge of the turbo fan when the turbo fan swings and contacts the rectifying unit with the fixed part of the hub and the motor rotation shaft as a fulcrum during transportation The ceiling-embedded air conditioner according to claim 9, wherein the air conditioner is embedded in a ceiling.   The rectifying unit is formed in a polygonal shape so as to come into line contact or surface contact when the turbofan shakes and contacts the rectifying unit with a fixed part between the hub and the motor rotating shaft as a fulcrum during transportation or the like. The ceiling-embedded air conditioner according to claim 10.   The rectifying unit is formed in a truncated cone shape so as to come into line contact when the turbo fan is shaken and contacts the rectifying unit with a fixed part between the hub and the motor rotating shaft as a fulcrum during transportation or the like. The ceiling-embedded air conditioner according to claim 10.   On the main plate side of the casing top plate, a top plate side heat insulating material constituting an air path inside the case top plate is provided, and the rectifying unit is integrally formed by the top plate side heat insulating material. The ceiling-embedded air conditioner according to any one of claims 9 to 12, wherein the air conditioner is embedded in a ceiling.   13. The ceiling-embedded air conditioner according to claim 9, wherein the rectifying unit is configured by deforming an area corresponding to a fan main plate of the casing top plate. .   13. The ceiling-embedded air according to claim 9, wherein the rectifying unit is a rectifying plate fixed to the top plate of the casing so as to be exchangeable directly or indirectly. Harmony machine.   The ratio E1 / D1 between the minimum gap E1 between the rectifying unit and the main plate and the height direction gap D1 between the top plate-side heat insulating material and the main plate is 0.3 to 0.7. The ceiling-embedded air conditioner according to any one of claims 9 to 15, wherein the ceiling-embedded air conditioner is formed. (A) a ceiling-embedded air conditioner body having a casing top plate;
(B) a turbofan that is provided inside the ceiling-embedded air conditioner body and that blows air;
(C) a motor that drives the turbofan, and is arranged in the ceiling-embedded air conditioner main body so that a rotation axis is orthogonal to the casing top plate;
(D) a heat exchanger erected so as to surround the turbofan;
(E) a plurality of reinforcing ribs formed in a region corresponding to the inner side of the heat exchanger in the housing top plate and projecting radially outward from the outer peripheral portion of the region facing the motor;
(F) a top plate-side heat insulating material provided inside the housing top plate;
The top plate-side heat insulating material is formed substantially along the protruding surface of each reinforcing rib, and partially or entirely along each radiation arrangement region other than each reinforcing rib of the casing top plate. Formed as
A ceiling-embedded air conditioner characterized in that a portion formed along the radiation arrangement region constitutes a radiation arrangement air duct that guides a part of the blowout flow from the turbofan to the motor. . (A) a ceiling-embedded air conditioner body having a casing top plate;
(B) a turbofan that is provided inside the ceiling-embedded air conditioner body and that blows air;
(C) a motor for driving the turbofan;
(D) a heat exchanger erected so as to surround the turbofan;
(E) a plurality of reinforcing ribs formed in a region corresponding to the inner side of the heat exchanger in the casing top plate and projecting radially outward from the outer peripheral portion of the region facing the motor;
(F) a top plate-side heat insulating material provided inside the housing top plate;
The top plate-side heat insulating material is formed so that substantially the whole is along a surface other than the reinforcing ribs, and is formed to be partly or entirely along the reinforcing rib portions of the casing top plate. ,
A ceiling-embedded air conditioner characterized in that a radiation arrangement air guide passage that guides a part of a blowout flow from a turbofan to the motor is formed by a portion formed along each of the reinforcing rib portions. Machine.   When the distance L0 from the rotation axis center of the motor to the outer peripheral end of the radial arrangement air guide path, the distance L2 from the rotation axis center of the motor to the inner peripheral edge of the radial arrangement air guide path, and the diameter L1 of the turbofan, The ceiling embedding according to claim 17 or 18, wherein the ceiling is embedded in a range of 0.5 x L1 ≤ L0 ≤ 0.6 x L1 and 0 ≤ L2 ≤ 0.3 x L1. Type air conditioner.   20. The ceiling-embedded air conditioner according to any one of claims 17 to 19, wherein the motor includes a motor built-in board on which a drive circuit and a control circuit are mounted. . 18. The motor according to claim 17, wherein the motor is disposed such that a height position of a top surface of the motor on a top side of the casing is lower than a height position of a surface of the top plate-side heat insulating material. The ceiling-embedded air conditioner according to claim 20.

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