WO2011092863A1

WO2011092863A1 - Blower and air conditioning device equipped with the blower

Info

Publication number: WO2011092863A1
Application number: PCT/JP2010/051353
Authority: WO
Inventors: 彰二山田; 剛森; 智哉福井; 正哉井上
Original assignee: 三菱電機株式会社
Priority date: 2010-02-01
Filing date: 2010-02-01
Publication date: 2011-08-04
Also published as: JPWO2011092863A1; JP5389191B2

Abstract

Provided is a blower in which the fan efficiency can be increased independently of the distance between a rotor and a stator, the distance being a design item for a motor. A blower (100) is provided with an impeller (4) comprising a boss (1) serving as the center of rotation, a plurality of blades (2) provided on the outer peripheral surface of the boss (1), and a rotor (5) provided at the outer periphery of the blades (2), and a housing (6) comprising a stator (9) disposed to face the rotor (5) on the outer peripheral side thereof, the impeller (4) being rotated by the driving force of a motor configured from the rotor (5) and the stator (9). The distance of closest approach between the impeller (4) and the housing (6) is configured so as to be shorter than the distance between the rotor (5) and the stator (9).

Description

Blower and air conditioner equipped with this blower

The present invention relates to a blower including an impeller having a rotor of a motor and a casing having a stator, and the impeller rotates by a driving force of the motor.

Conventionally, there has been proposed a blower that secures a ventilation path and that achieves a reduction in size and cost of a motor that is a drive source.
As such a blower, for example, “a substantially square housing 9 having a bearing holding portion 12 capable of rotating and holding the blades 8 at the center, a rotating shaft 8 a at the center, and a cylindrical rotating blade 8 is provided. In an axial fan system that rotates and holds an axial fan through a bearing, a sheet-like magnet 7 is annularly arranged on the outer periphery of the blade 8 as a rotor of a motor that is a driving source for driving the blade 8. 7 has a structure in which N poles and S poles are alternately arranged in the rotation direction to have even poles in the circumferential direction, and a substantially square housing 9 with respect to the rotor of the magnet 7. The armature magnetic poles (that is, the stator 6) having a plurality of phases of coils are arranged at least at two of the four corners.

JP 2008-199801 (Summary, FIG. 1)

When trying to improve the efficiency of the motor, it is preferable that the distance between the rotor and the stator is short (the gap formed between the rotor and the stator is preferably small). However, a conventional blower (see, for example, Patent Document 1) including a rotor on the outer peripheral portion of the impeller and a stator on the housing side has a rotor when the distance between the rotor and the stator is shortened. The impeller vibrates due to a periodic magnetic force change generated between the stator and the stator. In addition, noise is generated by this vibration. For this reason, the conventional blower has a problem that the distance between the rotor and the stator cannot be sufficiently reduced in order to suppress magnetic vibration and noise.

On the other hand, when viewed from the aerodynamic side of the blower, it is preferable that the distance between the rotor and the stator is short. However, the conventional blower has a problem that it is difficult to improve fan efficiency because the distance between the rotor and the stator cannot be sufficiently reduced as described above.

The present invention has been made to solve the above-described problems, and can improve fan efficiency independently of the distance between the rotor and the stator, which is a design matter of the motor. And it aims at obtaining the air conditioning apparatus carrying this air blower.

The blower according to the present invention has a boss as a rotation center, a plurality of blades provided on the outer peripheral surface of the boss, an impeller having a rotor provided on the outer peripheral portion of these blades, and an outer peripheral side of the rotor. A blower in which an impeller is rotated by a driving force of a motor composed of a rotor and a stator, and the impeller and the case are closest to each other. Is configured to be shorter than the distance between the rotor and the stator.

The air conditioner according to the present invention is equipped with the above-described blower.

According to the present invention, the distance of the portion where the impeller and the casing are closest to each other is configured to be shorter than the distance between the rotor and the stator. For this reason, the recirculation flow that flows in the opposite direction to the main flow from the discharge side, which is the high-pressure portion of the blower, to the intake side, which is the low-pressure portion, and the blade-end leakage flow that flows from the pressure surface of the blade to the negative pressure surface side can be suppressed. Therefore, it is possible to obtain a blower that can increase fan efficiency independently of the distance between the rotor and the stator, which is a design matter of the motor.

It is a schematic block diagram which shows an example of the air blower concerning Embodiment 1 of this invention. It is a schematic block diagram which shows another example of the air blower concerning Embodiment 1 of this invention. It is a principal part enlarged view (side sectional drawing) which shows an example of the convex part which concerns on Embodiment 1 of this invention. It is a principal part enlarged view (side sectional drawing) which shows another example of the convex part which concerns on Embodiment 1 of this invention. It is a principal part enlarged view (side sectional drawing) which shows another example of the convex part which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows an example of the airflow which generate | occur | produces in a blade | wing periphery part and becomes a cause of a fan efficiency fall. It is a principal part enlarged view (side sectional drawing) which shows another example of the convex part front-end | tip part which concerns on Embodiment 1 of this invention. It is a principal part enlarged view (side sectional drawing) which shows an example of the air blower concerning Embodiment 2 of this invention. It is a principal part enlarged view (side sectional drawing) which shows another example of the air blower concerning Embodiment 2 of this invention. It is a principal part enlarged view (side sectional drawing) which shows another example of the air blower concerning Embodiment 2 of this invention. It is a principal part enlarged view (side sectional drawing) which shows an example of the air blower concerning Embodiment 3 of this invention. It is a principal part enlarged view (side sectional drawing) which shows an example of the air blower concerning Embodiment 4 of this invention. It is a longitudinal cross-sectional view which shows an example of the air conditioning apparatus which concerns on Embodiment 5 of this invention.

Hereinafter, each embodiment for carrying out the present invention will be described with reference to the drawings. Note that in the drawings used for the following description, some components may be omitted in order to facilitate the description of the drawings. In each figure, the shape and size of each component may be different.

Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram illustrating an example of a blower according to Embodiment 1 of the present invention. 1A is a front view of the blower, and FIG. 1B is a side sectional view of the blower.
A blower 100 shown in FIG. 1 is an axial blower, a mixed flow blower, or the like in which a plurality of blades 2 are provided on the outer peripheral surface of a boss 1 serving as a rotation center. The blower 100 includes an impeller 4 and a housing 6.

The impeller 4 includes a boss 1, a plurality of blades 2 provided on the outer peripheral surface of the boss 1, and a rotor 5 of a rotation driving motor provided on the outer peripheral side of the blade 2. For example, the rotor 5 is configured by providing a ring-shaped member 3 or the like on the outer peripheral side of the blade 2 and forming the ring-shaped member 3 from a magnetic material. Further, for example, the rotor 5 is configured by providing a ring-shaped member 3 or the like on the outer peripheral side of the blade 2 and attaching or embedding a magnet on the outer peripheral side of the ring-shaped member 3.

This impeller 4 is housed in a housing 6. The casing 6 is provided with a stator 9 on a surface (hereinafter referred to as an inner peripheral portion) facing the outer peripheral side of the impeller 4 (more specifically, the outer peripheral side of the rotor 5). That is, the rotor 5 and the stator 9 are disposed to face each other. The impeller 4 is rotated by the driving force of the motor constituted by the rotor 5 and the stator 9.

Note that the blower 100 illustrated in FIG. 1 is an example of the blower illustrated in the first embodiment. The blower according to the first embodiment may be, for example, the following blower.
FIG. 2 is a schematic configuration diagram illustrating another example of the blower according to Embodiment 1 of the present invention. 2A is a front view of the blower, and FIG. 2B is a perspective view showing an outer peripheral portion of a blade of the blower. Moreover, the arrow shown in FIG.2 (b) is a rotation direction of a blade | wing.

The blower according to the first embodiment configured as described above is provided with a convex portion 10 in order to improve fan efficiency. In the following FIG. 3 to FIG. 5 showing an installation example (formation example) of the convex portion 10, the blower 100 in which the ring member 3 is provided on the outer peripheral portion of the blade 2 will be described as an example.

For example, as shown in FIG. 3, the convex portion 10 may be provided at a position on the air suction side. Moreover, this convex part 10 may be provided in the outer peripheral part (for example, outer peripheral part of the ring-shaped member 3) of the impeller 4, as shown to Fig.3 (a). For example, this convex part 10 may be provided in the inner peripheral part of the housing | casing 6, as shown in FIG.3 (b).
For example, as shown in FIG. 4, the convex part 10 may be provided at a position on the air discharge side. Moreover, this convex part 10 may be provided in the outer peripheral part (for example, outer peripheral part of the ring-shaped member 3) of the impeller 4, as shown to Fig.4 (a). For example, this convex part 10 may be provided in the inner peripheral part of the housing | casing 6, as shown in FIG.4 (b).
3 and 4 may be provided on both the outer peripheral portion of the impeller 4 (for example, the outer peripheral portion of the ring-shaped member 3) and the inner peripheral portion of the housing 6. That is, you may provide so that the convex part 10 provided in both may mutually oppose.

For example, as shown in FIG. 5, the convex part 10 may be provided on both the air suction side and the air discharge side. Moreover, this convex part 10 may be provided in the outer peripheral part (for example, outer peripheral part of the ring-shaped member 3) of the impeller 4, as shown to Fig.5 (a). For example, this convex part 10 may be provided in the inner peripheral part of the housing | casing 6, as shown in FIG.5 (b).
5 may be provided on both the outer peripheral portion of the impeller 4 (for example, the outer peripheral portion of the ring-shaped member 3) and the inner peripheral portion of the housing 6. For example, the air suction side convex portion 10 may be provided on the outer peripheral portion of the impeller 4 (for example, the outer peripheral portion of the ring-shaped member 3), and the air discharge side convex portion 10 may be provided on the outer peripheral portion of the impeller 4. Of course, these formation positions may be reversed.

As described above, in the

blowers

100 and 101 configured as described above, by providing the convex portion 10, the distance of the shortest portion between the impeller 4 and the housing 6 is set between the rotor 5 and the stator 9. It can be shorter than the distance. For this reason, the following effects can be acquired.

When trying to improve the efficiency of the motor, it is preferable that the distance between the rotor and the stator is short (the gap formed between the rotor and the stator is preferably small). However, in the conventional blower provided with a rotor on the outer peripheral portion of the impeller and provided with a stator on the housing side, when the distance between the rotor and the stator is shortened, between the rotor and the stator, The impeller vibrates due to the generated magnetic force. In addition, noise is generated by this vibration.

If the distance between the rotor and the stator is increased in order to prevent these vibrations and noises, an air flow that causes a decrease in fan efficiency is generated in the blade periphery.
FIG. 6 is an explanatory diagram illustrating an example of an airflow that occurs in the peripheral portion of the blades and causes a decrease in fan efficiency. In addition, the solid line arrow shown to Fig.6 (a) and FIG.6 (b) shows the flow direction of air. A white arrow shown in FIG. 6B indicates the rotation direction of the blade 302.

For example, in the case of the conventional blower in which the ring-shaped member 303 and the rotor 305 are provided on the outer peripheral portion of the blade 302 formed on the boss 301, when the distance between the rotor 305 and the stator 309 is increased, FIG. A recirculation flow 11 as shown in (a) occurs, and the fan efficiency decreases. More specifically, air flows between the rotor 305 and the stator 309 from the high pressure air discharge side to the low pressure air suction side. And this air is discharged again. For this reason, the recirculation flow 11 which circulates around the ring-shaped member 303 and the rotor 305 is generated, and the fan efficiency is lowered.

Further, for example, in the case of a conventional blower in which a ring-shaped member, a small blade, or the like is not provided on the outer peripheral portion of the blade 302, when the distance between the rotor and the stator is increased, as shown in FIG. Leak flow 12 is generated and fan efficiency is reduced. More specifically, a leakage flow 12 is generated on the outer peripheral end side of the blade 302 from the high pressure air discharge side to the low pressure air suction side, and fan efficiency decreases.

However, the

blowers

100 and 101 according to the first embodiment provide the convex portion 10 so that the shortest distance between the impeller 4 and the housing 6 is between the rotor 5 and the stator 9. It is shorter than the distance. For this reason, the distance between the rotor 5 and the stator 9 can be a distance that can suppress the vibration of the impeller 4 and noise caused by the vibration. Moreover, the recirculation flow 11 and the leakage flow 12 can be suppressed by shortening the distance between the impeller 4 and the housing 6. That is, the

fans

100 and 101 according to the first embodiment can increase the fan efficiency independently of the distance between the rotor 5 and the stator 9 which are the design items of the motor.

Moreover, by providing the convex part 10 in both the outer peripheral part (for example, outer peripheral part of the ring-shaped member 3) of the impeller 4 and the inner peripheral part of the housing | casing 6, the sealing performance between the impeller 4 and the housing | casing 6 is provided. And the fan efficiency of the blower 100 can be further improved.

Note that the tip of the convex portion 10 shown in FIGS. 3 to 5 may have a labyrinth structure as shown in FIG. FIG. 7 shows the convex portion 13 having a tip portion having a labyrinth structure as the convex portion 13. FIG. 7 shows an example in which the convex portion 13 is provided on the air discharge side of the impeller 4.

Moreover, the above-mentioned convex part 10 and convex part 13 may be continuously provided in the outer peripheral part of the impeller 4 and the inner peripheral part of the housing | casing 6, or are provided intermittently at predetermined intervals. It may be.

Embodiment 2. FIG.
Even in the structure as shown in the second embodiment, the distance of the shortest portion between the impeller 4 and the housing 6 can be made shorter than the distance between the rotor 5 and the stator 9. In the second embodiment, items that are not particularly described are the same as those in the first embodiment, and the same functions and configurations are described using the same reference numerals.

In the blower 102 according to the second embodiment, for example, the ring-shaped member 3 and the small blade 8 are formed on the outer peripheral portion of the blade 2, and the rotor 5 is provided on the outer peripheral portion. That is, the basic configuration of the blower 102 is the same as the basic configuration of the blower 100 and the blower 101 according to the first embodiment.
The blower 102 according to the second embodiment is replaced with, for example, resin on at least one of the outer peripheral portion of the rotor 5 and the inner peripheral portion of the stator 9 instead of the convex portions 10 and the convex portions 13 shown in the first embodiment. An insulating layer 16 is provided.
For example, the insulating layer 16 is provided as follows. The following FIGS. 8 to 10 showing installation examples (formation examples) of the insulating layer 16 will be described by taking the blower 102 in which the ring-shaped member 3 is provided on the outer peripheral portion of the blade 2 as an example.

For example, as shown in FIG. 8, the insulating layer 16 may be provided on the outer peripheral portion of the rotor 5.
For example, as shown in FIG. 9, the insulating layer 16 may be provided on the inner peripheral portion of the stator 9.
For example, as shown in FIG. 10, the insulating layer 16 may be provided on both the outer peripheral portion of the rotor 5 and the inner peripheral portion of the stator 9.

As described above, in the blower 102 configured as described above, the distance between the rotor 5 and the stator 9 is the distance of the shortest portion between the impeller 4 and the housing 6 as in the first embodiment. Can be shorter. For this reason, as in the first embodiment, the fan efficiency can be increased independently of the distance between the rotor 5 and the stator 9, which is a design matter of the motor.

Further, in the blower 102 configured as described above, the distance of the shortest portion between the impeller 4 and the housing 6 is set to the rotor 5 without providing irregularities in the gap between the impeller 4 and the housing 6. And the distance between the stator 9 and the stator 9 can be made shorter. For this reason, the assemblability at the time of manufacture improves and accumulation of dust etc. can be controlled.

Particularly, by providing the insulating layer 16 on the inner peripheral portion of the stator 9, the coil wound around the stator 9 can be covered with the insulating layer 16 and the housing 6. Covering the complex coil with unevenness can further suppress the accumulation of dust and the like.

Embodiment 3 FIG.
The convex part provided in the outer peripheral part of the impeller 4 is good also as following structures. In Embodiment 3, items that are not particularly described are the same as those in Embodiment 1 or Embodiment 2, and the same functions and configurations are described using the same reference numerals.

FIG. 11: is a principal part enlarged view (side sectional drawing) which shows an example of the air blower concerning Embodiment 3 of this invention. Moreover, the solid line arrow shown in FIG. 11 shows the flow direction of air.
The blower 103 according to the third embodiment is provided with an intake side guide 14 on the intake side of the outer peripheral portion of the impeller 4. The intake side guide 14 is an example of a convex portion provided on the outer peripheral portion of the impeller 4, and is integrally formed with the ring-shaped member 3, for example. The front end portion of the intake side guide 14 has a shape protruding from the inner peripheral portion of the housing 6 to the outer peripheral side. Further, the intake side guide 14 has a shape whose diameter is increased toward the upstream side of the air flow. That is, the closest distance between the impeller 4 and the housing 6 is the distance in the rotation axis direction of the impeller 4. More specifically, the distance between the tip of the intake side guide 14 and the housing 6 is the closest distance between the impeller 4 and the housing 6. In FIG. 11, a stepped portion is formed in the casing 6 in a range facing the tip of the intake side guide 14.

As described above, in the blower 103 configured as described above, the distance of the shortest portion between the impeller 4 and the housing 6 is set to the rotor 5 and the stator 9 as in the first and second embodiments. Can be shorter than the distance between. For this reason, as in the first and second embodiments, the fan efficiency can be increased independently of the distance between the rotor 5 and the stator 9 which are motor design items.

Further, in the blower 103 configured as described above, the airflow guided to the impeller 4 is smooth due to the shape of the intake side guide 14 whose diameter is increased toward the upstream side of the air flow. For this reason, the fan efficiency of the blower 103 is further improved.

Further, since the closest distance between the impeller 4 and the housing 6 is the distance in the rotation axis direction of the impeller 4, the fan 103 can be easily assembled even when the tip of the intake side guide 14 has a labyrinth structure. It becomes. Usually, when the impeller 4 is attached to the casing 6, the impeller 4 is inserted inside the casing 6 along the rotation axis direction of the impeller 4. At this time, if the configuration as in the third embodiment is adopted, when the impeller 4 is inserted into the inside of the housing 6 along the rotation axis direction of the impeller 4, the tip of the intake side guide 14 constituting the labyrinth structure This is because the unevenness of the portion and the unevenness on the housing 6 side can be engaged.

Embodiment 4 FIG.
The convex part provided in the outer peripheral part of the impeller 4 is good also as following structures. In Embodiment 4, items that are not particularly described are the same as those in Embodiments 1 to 3, and the same functions and configurations are described using the same reference numerals.

FIG. 12: is a principal part enlarged view (side sectional drawing) which shows an example of the air blower concerning Embodiment 4 of this invention. Moreover, the solid line arrow shown in FIG. 12 shows the flow direction of air.
The blower 104 according to the fourth embodiment is provided with a discharge side guide 15 on the discharge side of the outer peripheral portion of the impeller 4. The discharge side guide 15 is an example of a convex portion provided on the outer peripheral portion of the impeller 4, and is integrally formed with the ring-shaped member 3, for example. The distal end portion of the discharge-side guide 15 has a shape protruding from the inner peripheral portion of the housing 6 to the outer peripheral side. Further, the discharge side guide 15 has a shape whose diameter is increased toward the downstream side of the air flow. That is, the closest distance between the impeller 4 and the housing 6 is the distance in the rotational axis direction of the impeller 4. More specifically, the distance between the tip of the discharge side guide 15 and the housing 6 is the closest distance between the impeller 4 and the housing 6. In FIG. 12, a stepped portion is formed in the casing 6 in a range facing the tip of the discharge side guide 15.

As described above, in the blower 104 configured as described above, the distance of the shortest portion between the impeller 4 and the housing 6 is set to the rotor 5 and the stator 9 as in the first to third embodiments. Can be shorter than the distance between. For this reason, as in the first to third embodiments, the fan efficiency can be increased independently of the distance between the rotor 5 and the stator 9 which are the design items of the motor.

Further, in the blower 104 configured as described above, the air discharged from the impeller 4 decelerates while spreading in the radial direction due to the shape of the discharge-side guide 15 whose diameter is increased toward the downstream side of the air flow. Recover pressure. For this reason, the fan efficiency of the blower 104 is further improved.
If the intake side guide 14 of the third embodiment is also provided on the intake side of the outer peripheral portion of the impeller 4, the fan efficiency of the blower 104 is further improved.

Further, since the closest distance between the impeller 4 and the housing 6 is the distance in the rotation axis direction of the impeller 4, the fan 104 can be easily assembled even when the tip of the discharge side guide 15 has a labyrinth structure. It becomes. Usually, when the impeller 4 is attached to the casing 6, the impeller 4 is inserted inside the casing 6 along the rotation axis direction of the impeller 4. At this time, if the configuration as in the fourth embodiment is adopted, when the impeller 4 is inserted into the housing 6 along the rotational axis direction of the impeller 4, the tip of the discharge side guide 15 constituting the labyrinth structure This is because the unevenness of the portion and the unevenness on the housing 6 side can be engaged.

Embodiment 5 FIG.
FIG. 13: is a longitudinal cross-sectional view which shows an example of the air conditioning apparatus which concerns on Embodiment 5 of this invention. This FIG. 13 has shown the example which used the air blower 100 which concerns on Embodiment 1 for the indoor unit 200 of an air conditioning apparatus. FIG. 13 shows the left side of the drawing as the front side of the indoor unit 200. The configuration of the indoor unit 200 will be described based on FIG.
Of course, the fans 101 to 104 may be used as the fans of the indoor unit 200.

The indoor unit 200 supplies conditioned air to an air-conditioning target area such as a room by using a refrigeration cycle that circulates refrigerant. This indoor unit 200 mainly includes a casing 110 in which an inlet 111 for sucking indoor air into the interior and an outlet 115 for supplying conditioned air to an air-conditioning target area are formed, and the interior of the casing 110 Is installed in the blower 100 that sucks indoor air from the suction port 111 and blows conditioned air from the blower outlet 115, and is arranged in the air path from the suction port 111 to the blower 100, and exchanges heat between the refrigerant and the indoor air. And a heat exchanger 114 for producing conditioned air.

The suction port 111 is formed in the upper part of the housing 110. The air outlet 115 is formed in the lower part of the housing 110 (more specifically, the lower side of the front surface of the housing 110). The blower 100 is disposed on the downstream side of the suction port 111 and on the upstream side of the heat exchanger 114. Further, for example, three blowers 100 are arranged in the direction orthogonal to the paper surface. In addition, the installation number of the air blower 100 is an example to the last. What is necessary is just to change suitably the installation number of the air blower 100 according to the air volume etc. which are requested | required.

The heat exchanger 114 is disposed on the leeward side of the blower 100. The heat exchanger 114 includes a front side heat exchanger 114 a disposed on the front side of the housing 110 and a back side heat exchanger 114 b disposed on the back side of the housing 110. As this heat exchanger 114, for example, a fin tube heat exchanger or the like may be used. The suction port 111 is provided with a grill 112 and a filter 113. Furthermore, the blower outlet 115 is provided with a mechanism for controlling the blowing direction of the airflow, such as a vane (not shown).

Here, the flow of air in the indoor unit 200 will be briefly described.
First, room air flows into the indoor unit 200 from the suction port 111 formed in the upper part of the housing 110 by the blower 100. At this time, dust contained in the air is removed by the filter 113. When this indoor air passes through the heat exchanger 114, it is heated or cooled by the refrigerant flowing in the heat exchanger 114 to become conditioned air. The conditioned air is blown out of the indoor unit 200 from the air outlet 115 formed in the lower part of the housing 110, that is, to the air-conditioning target area.

In the indoor unit 200 (air conditioner) configured as described above, the blower 100 that can be reduced in size and cost is used. For this reason, the indoor unit 200 according to Embodiment 5 can be reduced in thickness and size. Further, the cost of the indoor unit 200 can be reduced.
Moreover, in the indoor unit 200 (air conditioner) configured as described above, the blower 100 with improved fan efficiency is used. For this reason, an indoor unit with a larger air volume than the conventional indoor unit can be obtained.

1 boss, 2 blades, 3 ring-shaped member, 4 impeller, 5 rotor, 6 housing, 8 winglet, 9 stator, 10 convex part, 11 recirculation flow, 12 leaking flow, 13 convex part, 14 intake Side guide, 15 discharge side guide, 16 insulation layer, 100-104 blower, 110 housing, 111 suction port, 112 grille, 113 filter, 114 heat exchanger, 114a front side heat exchanger, 114b back side heat exchanger, 115 air outlets, 200 indoor units (air conditioning devices), 301 bosses (conventional), 302 blades (conventional), 303 ring-shaped members (conventional), 304 impellers (conventional), 305 rotors (conventional), 306 housings (Conventional), 309 Stator (Conventional).

Claims

An impeller having at least a boss serving as a rotation center, a plurality of blades provided on the outer peripheral surface of the boss, and a rotor provided on the outer peripheral portion of the blade;
A housing having at least a stator disposed opposite to the outer peripheral side of the rotor;
With
A blower in which the impeller rotates by a driving force of a motor constituted by the rotor and the stator,
The blower characterized in that the distance between the impeller and the casing that is closest to each other is shorter than the distance between the rotor and the stator.
At least one of the outer peripheral part of the impeller and the inner peripheral part of the casing facing the outer peripheral part,
At least one of the air suction side and the air discharge side,
The blower according to claim 1, wherein a convex portion that shortens a distance between the impeller and the housing is provided.
At least one of the outer peripheral part of the impeller and the inner peripheral part of the casing facing the outer peripheral part,
On both the air intake side and air discharge side,
The blower according to claim 2, wherein the convex portion is provided.
The convex portion is provided on the outer peripheral portion of the impeller,
The convex portion protrudes from the inner peripheral portion of the housing facing the outer peripheral portion of the impeller, on the outer peripheral side.
The blower according to claim 2, wherein a distance between a portion where the impeller and the casing are closest to each other is a distance in a rotation axis direction of the impeller.
The blower according to claim 4, wherein the convex portion provided on the air suction side has a shape whose diameter is increased toward the upstream side of the air flow.
The blower according to claim 4, wherein the convex portion provided on the air discharge side has a shape whose diameter is increased toward the downstream side of the air flow.
The blower according to any one of claims 2 to 6, wherein a range in which the front end portion of the convex portion and the front end portion of the convex portion face each other has a labyrinth structure.
The blower according to claim 1, wherein an insulating layer is provided on at least one of the outer peripheral portion of the rotor and the inner peripheral portion of the stator.
The blower according to claim 8, wherein the insulating layer is provided at least on an inner periphery of the stator.
An air conditioner equipped with the blower according to any one of claims 1 to 9.