JP2012225541A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus further reduced in thickness and size as a ceiling-installation type or ceiling-embedded type air conditioner.SOLUTION: As air flow channels in an air conditioner 100, there are provided two channels: a first flow channel 11 in which outside air introduced from an air intake 2 of a casing 1 is exhausted from an exhaust port 3 through a heat exchange 8 from an outer peripheral part 10 of a turbo fan 6 in accordance with the rotation of the turbo fan 6 and a second flow channel 12 in which outside air is passed from the outer peripheral part 10 of the turbo fan 6 through a space between a bottom plate 4 of the casing 1 and a fan base 15, further passed through a vent 16 of a center 15a of the fan base 15 through a plurality of cooling grooves 14 formed at an upper corner 13a of a stator frame 13 of a motor 5, and combined with outside air introduced from the air intake 2.

Description

  The present invention relates to an air conditioner such as a ceiling installation type, a ceiling embedded type, or a wall mounted type for business use or vehicle use, and particularly relates to an air conditioner that is reduced in thickness.

  In the conventional air conditioner, various measures are taken in order to prevent the occurrence of problems due to the heating of the fan motor arranged in the sealed space. In the mixed flow blower as one of them, the motor and the impeller are housed in the casing, the motor is attached to the back plate of the casing, and the impeller is located in the hollow portion of the frustoconical boss, And after attaching the motor with a clearance S between the large-diameter end of the boss and the back plate of the casing, the air sucked from the small-diameter end of the boss during the rotation of the impeller flows through the outer surface of the boss conical surface, A technique is shown in which a part of the blown air that flows into the hollow portion of the boss through the gap S from the large-diameter end portion of the boss flows out from the ventilation hole provided in the boss's wharf surface (for example, Patent Document 1).

Japanese Utility Model Publication No. 62-018717

  However, the technique disclosed in Patent Document 1 has a problem in that it is not always possible to sufficiently meet the demand for thinner and more compact air conditioners. In other words, simply reducing the gap between the motor and the impeller in the casing to reduce the thickness and size required while maintaining the basic performance of the air conditioner will increase pressure loss and prevent overheating of the motor. There is a problem that the necessary cooling air cannot be sufficiently supplied.

  The present invention has been made to solve the above-described problems, and provides a thin and compact air conditioner that prevents overheating in a sealed state without impairing the basic performance of the motor. There is.

  An air conditioner according to a first aspect of the present invention is a motor installed on a bottom plate in a casing, and a turbo fan is directly connected to an upper portion of the motor. The casing has an air inlet at an upper portion facing the turbo fan, and the turbo fan. A heat exchanger is provided to face the outer peripheral portion of the gas generator, and an exhaust port is provided to a side portion facing the heat exchanger. The outside air introduced from the intake port by the rotation of the fan is discharged from the exhaust port through the heat exchanger from the outer periphery of the turbofan, and the turbofan is branched from the first channel. Passes between the bottom plate and the fan base from the outer periphery of the motor, passes through the cooling holes provided in the upper corner of the stator frame of the motor, passes through the air vent in the center of the fan base, and is introduced from the air inlet The That in which a second flow path merges with the outside air is provided.

  An air conditioner according to a second aspect of the present invention is a motor installed on a bottom plate in a casing, and a propeller fan is directly connected to the upper part of the motor. The casing has an air inlet at the upper part facing the propeller fan, and the propeller fan. A heat exchanger is provided opposite to the outer peripheral portion of the fan, and an exhaust port is provided in a side portion facing the heat exchanger, and is introduced from the intake port by the rotation of the propeller fan. Outside air passes through a plurality of cooling grooves provided in the outer peripheral portion of the propeller fan and in the upper corner portion of the stator frame of the motor, and is discharged from the exhaust port through the heat exchanger.

  In the air conditioner according to the first aspect of the present invention, the outside air sucked in as described above passes through the plurality of cooling grooves provided in the upper corner portion of the stator frame of the motor, which is the second flow path. As a result, the motor can be efficiently cooled, and a thin and compact air conditioner can be obtained without impairing the basic performance and air volume of the motor and the air conditioner.

  Further, in the air conditioner according to the second aspect of the invention, since the outside air sucked in as described above passes through a plurality of cooling grooves provided in the upper corner portion of the stator frame of the motor, the pressure loss is reduced and the motor is made efficient. It becomes possible to cool well, and there are the same effects as in the first invention.

1 is a cross-sectional view showing an air conditioner according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view showing the internal structure of the motor according to the first embodiment. FIG. 3 is a front sectional view showing a stator of the motor according to the first embodiment. FIG. 5 is a diagram showing cooling grooves provided in the stator frame according to the first embodiment. It is the expanded view which looked at the stator by Embodiment 1 from the inside. It is sectional drawing which shows the air conditioning apparatus by Embodiment 2.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
1 is a cross-sectional view showing the structure of an air-conditioning apparatus 100 according to Embodiment 1. FIG. In FIG. 1, an air conditioner 100 includes a turbo fan 6 directly connected to an upper portion of a motor 5 installed in a casing 1 and a heat exchanger 8 as main components. The motor 5 and the turbo fan 6 constitute a blower 7. An intake port 2 for introducing outside air is provided in the upper part of the casing 1, an exhaust port 3 for exhausting air sent out by the turbofan 6 is provided in the side portion 9, and a motor 5 is installed on the bottom plate 4 of the casing 1. Yes. The heat exchanger 8 supported by the casing 1 is provided to face the outer peripheral portion 10 of the turbofan 6, and the exhaust port 3 is provided on the side portion 9 of the casing 1 that faces the heat exchanger 8. Yes.

FIG. 2 shows the internal structure of the motor 5. In FIG. 2, the motor 5 is roughly divided into a stator 50 and a rotor 51. The stator 50 includes an iron core 18, a coil 20 wound around an insulating bobbin 19 around the iron core 18, and a stator frame 13 that is a resin molded product that is integrally formed to fix and form the outer shell. Has been. Here, as the resin, a resin having good thermal conductivity mixed with a commercially available alumina powder is used. The rotor 51 includes a shaft 26 that is rotatably supported via a bearing 25 fixed to the stator frame 13, and a permanent magnet 24 provided on the shaft 26.
FIG. 3 shows a front sectional view of the stator 50. In FIG. 3, the iron core 18 is provided with teeth 18a having a plurality of poles (9 poles in FIG. 3), and coils 20 are concentratedly wound around the teeth 18a. Here, the iron core 18 is laminated after punching a thin steel plate.

In the first embodiment, as shown in FIG. 1, the corner portion 13 a at the top of the stator frame 13 of the motor 5 is the portion closest to the fan base 15 of the turbofan 6. In this part, the resistance of the air flow generated by the turbo fan 6 described later increases. Accordingly, as shown in FIGS. 1 and 2 and FIG. 4 to be described later, a plurality of cooling grooves 14 having a substantially rectangular cross section are provided in the corner portion 13a at the top of the stator frame 13, and air flows in the cooling grooves 14. This prevents an increase in pressure loss.
Of course, air also flows between the corner portion 13 a and the fan base 15. Further, a plurality of vent holes 16 are provided in the central portion 15a of the fan base 15 to which the turbo fan 6 on the upper side of the motor 5 is directly connected, and air sent from the cooling groove 14 through the vent holes 16 is provided. It is returned to the turbo fan 6 and merges with the outside air introduced from the intake port 2.
FIG. 4 is a plan view showing a cooling groove 14 provided in the stator frame 13 when the motor 5 is viewed from the top, that is, from the turbo fan 6 side.
FIG. 5 is a developed plan view seen from the inner diameter side of the stator 50 shown in FIG. As can be seen from FIG. 5, the coil end 31 portion of the coil 20 wound around the plurality of teeth 18 a that are a plurality of poles provided on the stator frame 13 forms a large coil corner R portion 30, so that it is adjacent. A dead space 27 without the coil 20 is generated between the coils, that is, between the poles.
As shown in FIG. 4, a cooling groove 14 is provided in a corner portion 13 a outside the stator frame 13 in a portion corresponding to the dead space 27 as shown by arrows XX, and air is flown from an arrow A to an arrow A. It passes through the channel B.

Next, the operation | movement which mainly uses the flow of the air in this air conditioning apparatus 100 is demonstrated based on figures.
As shown in FIG. 1, when the turbo fan 6 is rotated by driving the motor 5, outside air is introduced from the upper air inlet 2 of the casing 1. The temperature of the inflowing outside air is adjusted from the outer peripheral portion 10 of the turbofan 6 through the heat exchanger 8 that is the first flow path 11 and is discharged from the exhaust port 3 to the outside of the casing 1. The air flowing through the first flow path 11 is an original function of the air conditioner 100 and is used for, for example, air conditioning in a room or a vehicle. On the other hand, a part of the air flow is branched from the first flow path 11 from the outer peripheral portion 10 of the turbo fan 6, and the stator frame of the motor 5 is formed between the fan base 15 of the turbo fan 6 and the bottom plate 4 of the casing 1. 13 and passes through the cooling groove 14 of the stator frame 13 from A to B, and from the vent 16 provided in the central portion 15a of the fan base 15, the air in the first flow path in the turbo fan 6 described above. A second flow path 12 that merges with is formed. Since the air passing through the second flow path 12 does not pass through the heat exchanger 8, it always functions as cooling air for the motor 5. Accordingly, the cooling air is passed through the cooling groove 14 provided in the stator frame 13 to cool the motor 5.

In order to reduce the thickness and size of the air conditioner 100 as described above, the cooling air cools the stator frame 13 that forms the second flow path 12 even if the distance between the motor 5 and the turbofan 6 is reduced. A cooling air passage passing through the working groove 14 is secured and the motor 5 is cooled.
Therefore, heat generated by energization of the coil 20 itself can be efficiently dissipated to prevent an increase in copper loss, and a temperature increase due to mechanical loss of the bearing 25 and the like can be reduced. Accordingly, the temperature rise of the permanent magnet 24 can also be suppressed, and the life can be extended, and the thinned and compact energy-saving air conditioner 100 with excellent performance can be obtained without impairing the performance of the motor 5 as a result. be able to.

Embodiment 2. FIG.
Next, the second embodiment will be described with reference to the drawings.
FIG. 6 is a cross-sectional view showing the structure of the air conditioner 100 according to the second embodiment. In FIG. 1 of the first embodiment described above, the turbo fan 6 is directly connected to the upper portion of the motor 5. In the second embodiment, the propeller fan 29 is directly connected to the upper portion of the motor 5 instead of the turbo fan 6, and the rest is the same as FIG.
Next, the operation will be described.
The propeller fan 29 is rotated by driving the motor 5, and the outside air introduced from the intake port 2 is adjusted in temperature through the heat exchanger 8 and discharged to the outside from the exhaust port 3. Air passing through the inner diameter side of the propeller fan 29 passes through the cooling groove 14 of the stator frame 13 of the motor 5 from B to A, cools the motor 5, and is discharged to the outside through the heat exchanger 8. .
Thus, also in the second embodiment, the cooling groove 14 is provided in the upper corner portion 13a of the stator frame 13 adjacent to the propeller fan 29, so that the cooling air passage is secured and the motor 5 is cooled. As a result, the air conditioner 100 can be made thinner and more compact.

Embodiment 3 FIG.
Next, a third embodiment will be described.
The first embodiment has a configuration in which air (cooling air) flows through the cooling groove 14 of the stator frame 13 which is a part of the first flow path and the second flow path of the air conditioner 100. 2 also prevented the motor 5 from being overheated by air (cooling air) passing through the cooling groove 14 of the stator frame 13 from the inner diameter side of the propeller fan 29. However, the structure of the motor 5 according to the first and second embodiments is not limited to the air conditioner 100, and is a general purpose motor, for example, having a severe electric load and a large temperature rise. It can also be applied to a natural air-cooled motor. That is, the plurality of cooling grooves 14 act as cooling fans on the stator frame 13 of the motor 5, and the heat dissipation area is expanded to suppress overheating of the motor 5. Therefore, there is an advantage that it can be applied as a motor other than a device having forced ventilation cooling.

Embodiment 4 FIG.
In the first and second embodiments, an example in which the stator frame 13 is a resin-molded frame having good thermal conductivity has been described. However, the present invention is not limited to this, and a metal frame having good thermal conductivity such as iron or an alloy thereof is used. There may be.
Further, the cooling groove 14 has a substantially rectangular cross-sectional shape, but is not limited to this, for example, a reverse convex shape corresponding to the shape of the dead space 27 between the coils 20, and further the manufacturability of the stator frame 13. To a U-shape or the like. Here, the end of the groove cross section is chamfered to increase the cooling air passage area. Furthermore, although the example of the stator of the motor 5 of the first and second embodiments has nine poles and nine cooling grooves 14 are also provided between the poles, the present invention is not limited to this and is required for the motor 5. There may be six or twelve cooling grooves 14 corresponding to six or twelve poles depending on the function, and it is not always necessary to provide them for each gap. Further, the coil 20 wound around the tooth 18a is wound so as to be concentrated on the tip side (rotor side) of the tooth 18a, whereby the dead space 27 can be increased, and a large cooling groove 14 can be formed. Become.
Further, in the example shown in FIGS. 1, 2, and 4, the cooling groove 14 is linearly formed. However, the rotation direction of the motor 5, that is, the rotation direction of the turbo fan 6 or the propeller fan 29 is shown. In the first embodiment, the first embodiment is skewed from the bottom to the top of the stator frame 13, that is, from A to B in FIG. 1, and the second embodiment is skewed from the top (B) to the bottom (A) of the stator frame 13. As a result, the pressure loss is reduced.

1 casing, 2 air inlets, 3 air outlets, 4 bottom plate, 5 motor,
6 turbofan, 8 heat exchanger, 9 side, 10 outer periphery, 11 first flow path,
12 second flow path, 13 stator frame, 13a corner portion, 14 cooling groove,
15 fan base, 16 vents, 29 propeller fan, 50 stator,
100 Air conditioner.

Claims (5)

A motor installed on a bottom plate in a casing, and an air conditioner in which a turbo fan is directly connected to an upper portion of the motor, wherein the casing has an air inlet at an upper portion facing the turbo fan, and the turbo fan A heat exchanger is provided facing the outer periphery, and an exhaust port is provided in a side facing the heat exchanger, and the air flow path in the air conditioner A first flow path in which outside air introduced from the intake port by rotation of the turbo fan is discharged from the exhaust port through the heat exchanger from the outer peripheral portion of the turbo fan, and from the first flow path The fan base diverges from the outer periphery of the turbofan, passes between the bottom plate and the fan base, and passes through a plurality of cooling grooves provided in an upper corner portion of the stator frame of the motor. Of through the central portion of the vent, the air conditioning apparatus characterized by a second flow path merges with the outside air is provided to be introduced from the air inlet. A motor installed on a bottom plate in a casing, and an air conditioner in which a propeller fan is directly connected to an upper portion of the motor, wherein the casing has an air inlet at an upper portion facing the propeller fan, and the propeller fan A heat exchanger is provided facing the outer periphery, and an exhaust port is provided on the side facing the heat exchanger, and is introduced from the intake port by the rotation of the propeller fan. Outside air passes through a plurality of cooling grooves provided in an outer peripheral portion of the propeller fan and in an upper corner portion of the stator frame of the motor, and is discharged from the exhaust port through the heat exchanger. An air conditioner characterized by. The air conditioner according to claim 1 or 2, wherein the stator frame is a thermally conductive resin molded frame or a metal frame. The air conditioning apparatus according to claim 1 or 2, wherein the cooling groove is skewed in the same direction as a rotation direction of the turbo fan or propeller fan. The air conditioning apparatus according to claim 1 or 2, wherein the cooling groove is provided for each of the stator poles of the motor.

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