JP3092371B2 - Outdoor unit for air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a blower suitable for an outdoor unit for an air conditioner, for example.

[0002]

2. Description of the Related Art Conventionally, as a blower of an outdoor unit for an air conditioner, for example, an axial flow fan such as a mixed flow fan disclosed in JP-A-1-96498 has been widely used.

FIGS. 13 and 14 show a first example of such an outdoor unit having a mixed flow fan structure.

In FIG. 1, reference numeral 1 denotes an outer casing of the outdoor unit for the air conditioner. An air intake grill 2 is provided on the back side of the outer casing 1, and an air outlet 3 is provided on the front side. Each is formed.

[0005] A heat exchanger 4 is provided in the outer casing 1 on the side of the air suction grille 2 and a diagonal fan 5 is provided between the fan guides FG on the air outlet 3 side. The heat exchanger 4 is disposed, for example, so as to cover the space in the outer casing 1 from the back side to the front side in a U-shaped cross section, while the heat exchanger space opening in the U-shaped cross section is provided. The diagonal flow fan 5 is installed on the side.

The mixed flow fan 5 has a truncated conical hub 5a whose cross section increases in diameter from the upstream side to the downstream side, and is mounted on the outer peripheral surface of the hub 5a at a predetermined angle of attack. And a plurality of blades (mixed flow blades) 5b. Further, a flat boss 7 is formed in the center of the hub 5a in a direction perpendicular to the axis.
The tip of the drive shaft 9 of the fan motor 8 is connected and fixed to the drive shaft 9.

[0007] Reference numeral 11 denotes an air outlet grill portion provided at the outermost end face on the front side of the air outlet 3.

Next, FIGS. 15 and 16 show a second example of the outdoor unit having a normal axial fan structure.

In the drawing, reference numeral 1 denotes an outer casing of the outdoor unit for the air conditioner, and air suction grilles 2A and 2B are provided on the back side and one side face of the outer casing 1, respectively.
An air outlet 3 is formed on the front side.

A heat exchanger 4 is provided on the side of the air suction grilles 2A and 2B in the outer casing 1, and an axial fan 5 'is provided between the fan guides FG on the air outlet 3 side.
Are arranged. The heat exchanger 4 is disposed so as to cover the space in the outer casing 1 from the back side and one side surface in a frontward direction in a hook-like cross section, while the heat exchanger 4 has a hook-like cross section in the heat exchanger space. The axial fan 5 'is located at the opening side.

The axial fan 5 ′ has a cylindrical hub 5 a ′ having a cross section from the upstream side to the downstream side and having a diameter substantially the same as the hub 5 a ′.
A plurality of blades (wings) 5b ', 5b',... Attached at a predetermined angle of attack to the outer peripheral surface of the hub 5a '. A flat boss 7 is formed in the center of the hub 5a 'in the direction perpendicular to the axis at the center thereof, and the tip of the drive shaft 9 of the fan motor 8 is connected and fixed to the boss 7. I have.

Reference numeral 11 denotes an air outlet grill portion provided at the outermost end face on the front side of the air outlet 3 as in the first embodiment.

[0013]

However, in the structure of the first conventional example of the blower for the outdoor unit as shown in FIGS. 13 and 14, as shown in FIG. A leak flow S which tends to flow backward from the nozzle to the negative pressure surface side occurs. Also, flow separation occurs downstream of the suction side of the fan guide portion FG. Therefore, as a result, the blowing efficiency is deteriorated and the turbulent flow is generated by the blades 5b, 5b.
There was a problem of generating noise by interfering with b.

When the specific speed of the mixed flow fan 5 is increased in the configuration shown in FIGS. 13 and 14, the dynamic pressure occupying the total pressure difference before and after the fan 5 is increased, but the dynamic pressure energy is directly transmitted to the outside. Since it is discarded, there is a problem that the efficiency of the fan 5 is reduced and noise is increased due to an increase in specific speed. Further, in the same configuration, substantially the entire front portion of the outer casing 1 is an air blowing grill 11, so that the air blown out by the large dynamic pressure energy is discharged forward as it is, and is blown to a person crossing the front. I will. In addition, there is a disadvantage that the rotating blades can be seen from the front side and the appearance is poor.

Next, a diffuser is generally used as the dynamic pressure recovery means. Since the diffuser works effectively when the mixed flow fan 5 is operated in an axially symmetric flow, for example, as shown in FIG. 15 and the second conventional example of the outdoor unit shown in FIG. 16, air suction grilles 2A and 2B are provided on the back side 1A and the side 1B side of the outer casing 1, respectively, and air flows in from both of them. With such a structure, the diffuser effect cannot be expected much.

[0016]

The blower of the outdoor unit for an air conditioner according to the invention described in claims 1 to 4 of the present application is:
The present invention has been developed to address such a problem, and is configured as follows.

(1) Configuration of the invention according to claim 1 The outdoor unit for an air conditioner according to the invention according to claim 1 is:
An outer casing, an air inlet provided on the back side of the outer casing, an air outlet provided on the front side of the outer casing, a fan guide provided on the air outlet, and the outer casing The heat exchanger provided on the side of the air suction port in the inside and the heat exchanger in the outer casing and the air outlet are located, and the tip of the blade is rotated into the fan guide. In the outdoor unit for an air conditioner, comprising a fan fitted and fitted as possible, while forming a bell mouth having a semicircular cross section from the air suction side to the air blow side of the fan guide section, A shroud having a suction side edge and a blowing side edge is provided at the tip of the blade of the fan, and the suction side edge and the blowing side edge of the shroud are bell-shaped with a semicircular cross section. It is constructed by forming an annular air circulation chamber between said bell mouth and the shroud by engaging in the mortar.

(2) Structure of the invention according to claim 2 The outdoor unit for an air conditioner according to the invention according to claim 2 is:
In the configuration of the first aspect of the present invention, the bell mouth portion is configured such that the thickness of the air outlet side edge portion is increased and rounded.

(3) Structure of the invention according to claim 3 The outdoor unit for an air conditioner according to the invention according to claim 3 is:
A rectifying ring member having an elliptical cross section is provided at the center of the air circulation chamber in the configuration of the first or second aspect of the invention.

(4) Structure of the invention according to claim 4 The outdoor unit for an air conditioner according to the invention according to claim 4 is:
An outer casing, an air inlet provided on the back side of the outer casing, an air outlet provided on the front side of the outer casing, a fan guide provided on the air outlet, and the outer casing The heat exchanger provided on the side of the air suction port in the inside and the heat exchanger in the outer casing and the air outlet are located, and the tip of the blade is rotated into the fan guide. In an outdoor unit for an air conditioner comprising a fan fitted and fitted as possible, a diffuser is provided at the air outlet, and a cylindrical shape corresponding to a hub end of the fan is provided on an inner surface of the diffuser. Are formed, the fan driving motor is housed and installed in the cylindrical projection, and the motor cooling air introduction hole is provided in the peripheral wall of the projection. .

[0021]

The outdoor unit for an air conditioner according to the first to fourth aspects of the present invention is configured as described above, and as a result, exhibits the following operation corresponding to each configuration. .

(1) Operation of the outdoor unit for an air conditioner according to the first aspect of the invention In the configuration of the outdoor unit for an air conditioner according to the first aspect, an outer casing and a rear side of the outer casing. An air inlet provided on the front side of the outer casing, a fan guide provided on the air outlet, and an air inlet located in the outer casing on the side of the air inlet. And a fan which is located between the heat exchanger and the air outlet in the outer casing and has a blade end rotatably fitted in the fan guide. In the outdoor unit for an air conditioner comprising: a bell mouth having a semicircular cross section from the air suction side to the air blow side of the fan guide portion; A shroud having a suction side edge and a blowing side edge at a tip end of the bell mouth, and fitting the suction side edge and the blowing side edge of the shroud into the bell mouth having a semicircular cross section. An annular air circulation chamber is formed between the air circulation chamber and the shroud.

As described above, in the structure of the conventional blower for the outdoor unit, since the clearance between the blade tip and the fan guide is large, the air flows backward from the pressure surface side to the suction surface side at the blade tip portion. A leak flow to be generated occurs, and separation of the flow occurs downstream of the suction side of the fan guide portion. Therefore, as a result, there is a problem that the blowing efficiency is deteriorated and the turbulent flow interferes with the blades to generate noise.

However, in the configuration of the present invention, as described above, a bell mouth having a semicircular cross section is formed from the air suction side to the air blow side of the fan guide portion, while the suction side edge is formed at the tip of the blade portion of the fan. And a shroud having a blowout side edge portion, and the suction side edge portion and the blowout side edge portion of the shroud are fitted into the bell mouth having a semicircular cross-section, so that a space between the bell mouth and the shroud is provided. Since an annular air circulation chamber is formed in the fin, there is substantially no gap between the blade tip and the fan guide, so that leakage flow at the blade tip does not interfere with the fan guide. Further, of the blown air, the air that has flowed into the gap between the shroud and the bell mouth portion on the blowing side flows along the inner wall surface of an annular air circulation chamber provided outside the shroud, and Flow into the impeller again from the gap between the inlet and the bell mouth part on the suction side to create a smooth circulating flow and increase the flow velocity near the inner surface of the shroud, so that the flow separation unlike the conventional one is less likely to occur .

As a result, the blowing efficiency is improved and the operating noise is reduced.

In the structure of the present invention, when the suction side edge (upstream side edge) of the shroud of the fan is curved toward the center of the shroud and formed in an arc-shaped cross section, the generation of the circulating flow is further improved. It becomes smooth and the noise reduction effect becomes higher.

Similarly, the outlet side edge (downstream side edge) of the shroud of the fan is further curved toward the center of the shroud so that both the suction side and the outlet side flow edge portions are formed in an arc-shaped cross section. In addition, the generation of the circulation flow is further smoothed, and the noise reduction effect is further enhanced.

Furthermore, both the suction side edge (upstream side edge) and the blowout side edge (downstream side edge) of the shroud in the above fan configuration are curved in the center direction of the shroud and are connected to each other. When the cross section is formed in an annular shape, the generation of the circulating flow is particularly smooth, and the noise reduction effect is further enhanced.

(2) Operation of the outdoor unit for an air conditioner according to the second aspect of the invention The configuration of the outdoor unit for an air conditioner according to the second aspect of the invention is the same as that of the first aspect of the invention. The bell mouth part has a thicker wall at the side of the air outlet and is rounded.

Thus, the blow-out side edge (downstream side edge) of the bell mouth portion of the mixed flow fan according to the first aspect of the present invention.
When a streamline-shaped thick portion with a rounded end is formed at the tip, the generation of the circulating flow becomes smooth as in the case of the first aspect of the present invention. As a result, the separation of the flow, which is likely to occur in the above, does not occur, and the noise reduction effect is further increased.

(3) Operation of the outdoor unit for an air conditioner according to the third aspect of the invention The configuration of the outdoor unit for an air conditioner according to the third aspect of the present invention is the same as that of the first aspect of the invention. A rectifying ring member having an elliptical cross section is provided at the center of the air circulation chamber.

As described above, when the straightening ring having an elliptical cross section is provided in the above-mentioned air circulation chamber, the above-mentioned claim 1 or 2 is provided.
Similar to the described invention, the flow of the circulation flow becomes smooth,
The noise reduction effect is improved.

(4) Operation of the outdoor unit for an air conditioner according to the fourth aspect of the invention In the configuration of the outdoor unit for an air conditioner according to the fourth aspect, an outer casing and a rear side of the outer casing. An air inlet provided on the front side of the outer casing, a fan guide provided on the air outlet, and an air inlet located in the outer casing on the side of the air inlet. And a fan which is located between the heat exchanger and the air outlet in the outer casing and has a blade end rotatably fitted in the fan guide. In the outdoor unit for an air conditioner comprising: a diffuser is provided at the air outlet, and a cylindrical projection corresponding to a tip of a hub of the fan is provided on an inner surface of the diffuser. Form is provided an air introducing hole for the motor cooling in the peripheral wall portion of the motor for the fan drive housed placed in cylindrical projections, and the projecting portion.

In the above-described conventional configuration, as the specific speed of the axial fan increases, the dynamic pressure occupying the total pressure difference before and after the fan increases. However, since the dynamic pressure energy is discarded to the outside, the fan efficiency is reduced. There is a problem that the noise is increased due to the decrease in specific speed and the increase in specific speed. Further, in this configuration, since substantially the entire front surface of the outer casing is an air blowing grill, the air blown out by the large dynamic pressure energy is directly discharged forward and blown to a person crossing the front. In addition, there were drawbacks such as the rotating blades being visible from the front side, and poor appearance.

Further, a diffuser is generally used as the dynamic pressure recovery means. Since the diffuser works effectively when the axial fan is operated in an axially symmetric flow, a conventional outdoor diffuser is used. Like the machine unit, the outer casing has air intake grilles on the rear side and side sides, respectively, and the structure in which air flows in from both of them can hardly expect a diffuser effect.

However, in the configuration of the present invention, by making the shape of the heat exchanger a U-shape that is axisymmetric, the flow in the outdoor unit becomes closer to the axisymmetric flow, and the diffuser operates effectively. Since the dynamic pressure is recovered and the fan efficiency is improved, the number of revolutions can be reduced and the operation noise can be reduced. In addition, it hardly causes discomfort to those who pass by. Further, the diffuser itself serves as a sound insulation wall to prevent the direct emission of the sound generated from the mixed flow fan, thereby reducing the operation sound. Further, since the main flow of the mixed flow fan blown air smoothly flows along the outer wall along the diffuser wall, the fan efficiency is further improved.

In this case, a cylindrical projection corresponding to the tip of the hub of the fan is formed on the inner surface of the diffuser.
The fan driving motor is housed and installed in the cylindrical projection, and the motor cooling air introduction hole is provided in the peripheral wall of the projection.

With this configuration, the central portion of the diffuser can be effectively used as an installation space for the fan motor, while air introduced from the air introduction hole provided in the peripheral wall of the projection is introduced into the projection. Since the housed fan motor is cooled and led to the fan outlet side or the fan upstream side, the cooling air circulation efficiency is increased, and the cooling performance of the fan motor is improved.

Further, the sound reflected on the wall surface of the diffuser and radiated to the outside can be absorbed to some extent, for example, by providing a sound absorbing material, and the operating noise is reduced. Moreover, by applying a color coating to the front surface of the diffuser and the outer casing in accordance with the installation location, the outdoor unit can be designed in a harmonious design with the surroundings, thereby providing many advantages.

[0040]

As described above, according to the outdoor unit for an air conditioner according to the first to fourth aspects of the present invention, the following effects can be obtained.

(1) Since there is no gap between the blade tip and the fan guide, there is no interference between the leakage flow at the blade tip and the fan guide. In addition, the circulating flow generated around the shroud makes it difficult for the flow to separate on the inner surface of the shroud, reduces operating noise and eliminates interference between the blade tip vortex and the fan guide, and the circulating flow generated from the annular chamber to the shroud. Thereby, separation of the flow on the inner surface of the shroud can be prevented.

(2) The invention according to claim 4 wherein the flow inside the machine is close to axisymmetric, the dynamic pressure can be effectively recovered by the diffuser, and the fan efficiency is improved, so that the number of revolutions of the fan can be reduced and the operation noise can be reduced. Decrease. In addition, direct fan noise radiation can be prevented.

[0043]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) First Embodiment First, FIG. 1 shows the structure and operation of an outdoor unit for an air conditioner employing a blower unit according to a first embodiment of the present invention.

In the drawing, reference numeral 1 denotes an outer casing of the outdoor unit. An air intake grill 2 is provided on the back side of the outer casing 1 and an air outlet 3 is provided on the front side.
Are respectively formed.

A heat exchanger 4 is provided in the outer casing 1 on the side of the air suction grille 2 and a mixed flow fan 5 is provided between the fan guides FG on the air outlet 3 side. The heat exchanger 4 is disposed so as to cover the space inside the outer casing 1 from the back side to the front side in a U-shaped cross section, while the heat exchanger 4 has a U-shaped cross section inside the opening side. And the above-mentioned mixed flow fan 5 is installed.

The mixed flow fan 5 has a truncated conical hub 5a whose cross section increases in diameter from the upstream side to the downstream side, and is mounted on the outer peripheral surface of the hub 5a at a predetermined angle of attack. A plurality of blades (oblique flow blades) 5b, 5b,
.. 5b .. and a shroud 5c attached to the outer edge on the tip side. The hub 5a has a flat boss 7 formed at the center thereof in the direction perpendicular to the axis. The tip of the drive shaft 9 of the fan motor 8 is connected and fixed to the boss 7.

On the other hand, a portion of the air outlet 3 corresponding to the shroud 5c of the mixed flow fan 5 has a bell mouth having a semicircular cross section which is located on both sides of the suction side and the blow side and is continuous with each other. BM is provided and the bell mouth B is provided.
The shroud 5c is fitted to the opening side of the M while maintaining a predetermined air flow interval, so that annular air is introduced and introduced between the bell mouth BM and the shroud 5c. A circulation chamber 10 is formed.

Further, reference numeral 11 denotes an air blowing grill portion provided at the outermost end face on the front side of the air blowing port 3.

As described above, in the structure of the conventional blower for an outdoor unit as shown in FIG. 13, as shown in the figure, the leakage flow from the pressure surface side to the negative pressure surface side at the blade end is as shown. S occurs. Also, flow separation occurs downstream of the suction side of the fan guide portion FG. Therefore,
As a result, there is a problem that the blowing efficiency is deteriorated and the turbulent flow interferes with the blades 5b, 5b, and generates noise.

However, in the configuration of the present embodiment, since there is substantially no gap between the blade tip and the fan guide FG, interference between the leakage flow at the blade tip and the fan guide FG does not occur. Further, of the blown air, the air that has flowed into the gap between the shroud 5c and the bell mouth BM on the blowing side flows along the inner wall surface of the annular air circulation chamber 10 provided outside the shroud 5c, 5c and the bell mouth BM on the suction side again flow into the impeller to create a smooth circulating flow and increase the flow velocity near the inner surface of the shroud 5c. .

As a result, the blowing efficiency is improved and the operating noise is reduced.

(2) Second Embodiment Next, FIG. 2 shows the configuration and operation of an outdoor unit for an air conditioner employing a blower unit according to a second embodiment of the present invention.

In the configuration of this embodiment, the suction side edge (upstream side edge) of the shroud 5c in the configuration of the mixed flow fan 5 of the first embodiment is curved toward the center of the shroud 5c to form an arc-shaped section. It is characterized by being formed in. The other parts are exactly the same as those of the first embodiment.

As described above, when the suction side edge of the blade tip side shroud 5c is formed in an arc shape, the generation of the circulating flow becomes smoother, and the noise reduction effect is further enhanced.

(3) Third Embodiment Next, FIG. 3 shows the configuration and operation of an outdoor unit for an air conditioner configured by employing a blower unit according to a third embodiment of the present invention.

In the configuration of the present embodiment, the blow-out side edge (downstream edge) of the shroud 5c in the configuration of the mixed flow fan 5 of the second embodiment is further curved toward the center of the shroud 5c. The edge portion is formed in an arc-shaped cross section. The configuration of the other parts is exactly the same as that of the first and second embodiments.

As described above, when both the suction side and the blowout side edges of the blade tip side shroud 5c are arc-shaped, the generation of the circulating flow becomes even smoother.
The noise reduction effect is further enhanced.

(4) Fourth Embodiment Next, FIG. 4 shows the configuration and operation of an outdoor unit for an air conditioner configured by employing a blower unit according to a fourth embodiment of the present invention.

In the configuration of this embodiment, both the suction side edge (upstream side edge) and the blowout side edge (downstream side edge) of the shroud 5c in the configuration of the mixed flow fan 5 of the third embodiment described above. The shroud 5c is characterized by being formed in the shape of an annular cross section which is curved toward the center of the shroud 5c and connected to each other. The configuration of other parts is exactly the same as that of the first, second and third embodiments.

As described above, when the shape of the suction side edge and the shape of the blow side both edges of the blade tip side shroud 5c are formed to be continuous and annular, the generation of the circulating flow becomes particularly smooth, and The noise reduction effect is higher than in any of the second, third and third embodiments.

(5) Fifth Embodiment Next, FIG. 5 shows the configuration and operation of an outdoor unit for an air conditioner configured by employing a blower unit according to a fifth embodiment of the present invention.

In the configuration of the present embodiment, a streamlined thick portion 12 is formed at the tip of the outlet side edge (downstream side edge) of the bell mouth BM in the configuration of the mixed flow fan 5 of the first embodiment. It is characterized by the following. The other parts are exactly the same as those of the first embodiment.

With such a configuration, the smooth generation of the circulating flow is essentially the same as in the first embodiment, so that the separation of the flow, which has conventionally been likely to occur downstream of the downstream edge of the bell mouth, does not occur. The noise reduction effect is increased accordingly.

(6) Sixth Embodiment First, FIG. 6 shows the configuration and operation of an air conditioner outdoor unit that employs a blower unit according to a sixth embodiment of the present invention.

In the present embodiment, the structure of the bell mouth portion BM of the fan guide portion FG of the fifth embodiment is changed to an open state as shown in the figure without being continuous in a semicircular shape. In this case, the same noise reduction effect as in the above embodiment can be obtained. The structure of the bell mouth portion BM can be employed in the same manner in the first to fourth embodiments.

(7) Seventh Embodiment FIG. 7 shows the structure and operation of an air conditioner outdoor unit using a blower unit according to a seventh embodiment of the present invention.

This embodiment is characterized in that a rectifying ring 14 having an elliptical cross section is installed in the air circulation chamber 10 between the shroud 5c and the bell mouth BM in the configuration of the mixed flow fan 5 of the first embodiment. Things. The other parts are exactly the same as those of the fifth embodiment.

When the rectifying ring 14 having an elliptical cross section is provided in the air circulation chamber 10 as described above, the flow of the circulating flow becomes smooth as in the fourth embodiment, and the noise reduction effect is improved. .

(8) Eighth Embodiment First, FIGS. 8 to 10 show the structure and operation of an air conditioner outdoor unit that employs a blower unit according to an eighth embodiment of the present invention. .

In any of the first to seventh embodiments, there is a merit that the air rectifying function in the fan guide FG portion is enhanced and the noise reduction effect is enhanced in any case. On the other hand, when the specific speed of the axial fan 5 increases in the above configuration, the dynamic pressure in the total pressure difference before and after the fan 5 also increases. However, since the dynamic pressure energy is discarded to the outside, the efficiency of the fan 5 is reduced. And the noise increases due to the increase in the specific speed. Further, in the above configuration, substantially the entire front portion of the outer casing 1 is the air blowing grill 11, so that the air blown out by the large dynamic pressure energy is discharged forward as it is, and is blown to a person crossing the front. I will. In addition, there are drawbacks such as the blades rotating from the front side and poor appearance.

Further, a diffuser is generally used as the dynamic pressure recovery means. Since the diffuser works effectively when the axial fan is operated in an axially symmetric flow, for example, FIG. 15 and FIG. 16, the air intake grills 2A, 2A are provided on the rear side 1A and the side 1B side of the outer casing 1, respectively, as in the conventional outdoor unit shown in FIG.
B, and if air flows in from both of them, the diffuser effect cannot be expected much with the structure.

The outdoor unit for an air conditioner of the present embodiment is configured to address such a problem.

First, in FIG. 8, reference numeral 1 denotes an outer casing of the outdoor unit of the present embodiment.
An air intake grille 2 is formed on the back side of the airbag, and an air outlet 3 is formed on the front side thereof.

A heat exchanger 4 is provided on the side of the air suction grill 2 in the outer casing 1, and a mixed flow fan 5 is provided on the side of the air outlet 3. The heat exchanger 4 is disposed so as to cover the space in the outer casing 1 from the back side to the front side in a U-shaped cross section, while the heat exchanger 4 is disposed in the front of the heat exchanger space having the U-shaped cross section. The fan 5 is installed in the fan guide FG.

The mixed flow fan 5 has a truncated conical hub 5a whose diameter increases from the upstream side to the downstream side, and is attached to the outer peripheral surface of the hub 5a at a predetermined angle of attack. And a plurality of blades (mixed flow blades) 5b. Further, a flat boss 7 is formed in the center of the hub 5a in a direction perpendicular to the axis.
The distal end of the drive shaft 9 of the fan motor 8 provided opposite to the above embodiments is connected and fixed.

On the other hand, as shown in FIG. 9, in this embodiment, the compressor 20 is installed horizontally at the lower part,
Is provided above the compressor 20.

Reference numeral 21 denotes a diffuser provided on the front surface of the air outlet 3 so as to face the mixed flow fan 5, and the diffuser 21 is provided on the upper, lower, left and right outer peripheral portions with the air outlet 3. An air blowing grill 27 is formed therebetween, and a projection 22 corresponding to the outer diameter of the hub 5a having a truncated cone shape is provided inside a center portion corresponding to the drive shaft 9 of the mixed flow fan 5. The protrusion 22 is formed with a fan motor housing groove 22a having an inner diameter corresponding to the inner diameter of the hub 5a on the large diameter end side, and the fan motor 8 is housed and fixed in the fan motor housing groove 22a. In the peripheral wall portion 22b of the protrusion 22, air introduction holes 23 for introducing air for cooling the fan motor 8 are provided.
Are formed in the circumferential direction.

Therefore, in this configuration, by laying the compressor 20 horizontally at the lower part and making the shape of the heat exchanger 4 U-shaped as shown in FIG. As a result, the diffuser 21 acts effectively and the dynamic pressure is collected, and the fan efficiency is improved, so that the number of revolutions can be reduced and the running noise can be reduced. In addition, it hardly causes discomfort to those who pass by. Further, the diffuser 21 itself serves as a sound insulating wall, which can prevent direct emission of the sound generated from the mixed flow fan 5, and the operating sound is reduced. In addition, the main flow of the mixed-flow fan blown air flows smoothly to the four outer sides along the wall surface of the diffuser 21, so that the fan efficiency is further improved. A part of the main stream is formed by air pressure holes (through holes) 23, 23
Through the gap between the hub 5a and the protruding portion 22 to the fan outlet side, so that the overheating of the fan motor 8 can be prevented, and the above diffuser The central portion 21 can be effectively used as a space for installing the fan motor 8. further,
The sound reflected on the wall surface of the diffuser 21 and radiated to the outside can be absorbed to some extent by providing a sound absorbing material, for example, and the operating noise is reduced. Moreover, by applying a color coating to the front surface of the diffuser 21 and the outer casing 1 according to the installation location, there are many advantages such as the outdoor unit being designed to be in harmony with the surroundings.

(9) Ninth Embodiment FIG. 11 shows the configuration of an outdoor unit for an air conditioner according to a ninth embodiment of the present invention.

The outdoor unit of the present embodiment is different from the outdoor unit of the eighth embodiment in that a plurality of air outlet holes 28, 28.. Are formed.

With this configuration, the air introduced from the air introduction holes 23, 23.
Is cooled, and is further discharged to the upstream side of the mixed flow fan 5 with a negative pressure, so that the cooling air circulation efficiency is higher than in the eighth embodiment, and the cooling performance of the fan motor 8 is further improved. .

(10) Tenth Embodiment FIG. 12 shows the configuration of an outdoor unit for an air conditioner according to a tenth embodiment of the present invention.

The outdoor unit of the present embodiment is the same as the outdoor unit of the eighth embodiment, except that the auxiliary blades 29, 2 are provided at the inner end of the hub 5a of the mixed flow fan 5.
Are provided, and the cooling performance of the fan motor 9 is further enhanced by forming a circulating flow similar to that of the ninth embodiment by the auxiliary blades 29, 29,. Is what you do.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view of an outdoor unit for an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a horizontal sectional view of an outdoor unit for an air conditioner according to a second embodiment of the present invention.

FIG. 3 is a horizontal sectional view of an outdoor unit for an air conditioner according to a third embodiment of the present invention.

FIG. 4 is a horizontal sectional view of an outdoor unit for an air conditioner according to a fourth embodiment of the present invention.

FIG. 5 is a horizontal sectional view of an outdoor unit for an air conditioner according to a fifth embodiment of the present invention.

FIG. 6 is a horizontal sectional view of an outdoor unit for an air conditioner according to a sixth embodiment of the present invention.

FIG. 7 is a horizontal sectional view of an outdoor unit for an air conditioner according to a seventh embodiment of the present invention.

FIG. 8 is a horizontal sectional view of an outdoor unit for an air conditioner according to an eighth embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of an outdoor unit for an air conditioner according to an eighth embodiment of the present invention.

FIG. 10 is a front view of an outdoor unit for an air conditioner according to an eighth embodiment of the present invention.

FIG. 11 is a horizontal sectional view of an outdoor unit for an air conditioner according to a ninth embodiment of the present invention.

FIG. 12 is a horizontal sectional view of an outdoor unit for an air conditioner according to a tenth embodiment of the present invention.

FIG. 13 is a horizontal sectional view of an outdoor unit for an air conditioner according to a first conventional example.

FIG. 14 is a front view of an outdoor unit for an air conditioner according to the first conventional example.

FIG. 15 is a horizontal sectional view of an outdoor unit for an air conditioner according to a second conventional example.

FIG. 16 is a front view of an air conditioner outdoor unit according to the second conventional example.

[Description of Signs] 1 is an outer casing, 2 is an air intake grille, 3 is an air outlet, 4 is a heat exchanger, 5 is a mixed flow fan, 5a is a hub, 5b is a blade, 5c is a shroud, and 7 is a boss. , 8 is a fan motor, 9 is a drive shaft, 10 is an air circulation chamber, 12 is a thick portion, 14 is a rectifying ring, 21 is a diffuser, 22 is a protrusion, 23 is an air introduction hole, 28 is an air outflow hole, 29 is an auxiliary blade.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-251138 (JP, A) JP-A-50-63508 (JP, A) JP-A-62-2199 (JP, A) JP-A-57-63 110800 (JP, A) JP-A-4-41992 (JP, A) Japanese Utility Model Application Laid-Open No. 60-185100 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04D 29/54 F04D 29 / 66 F04D 29/32

Claims (4)

(57) [Claims] 1. An outer casing, an air inlet provided on a back side of the outer casing, an air outlet provided on a front side of the outer casing, and a fan guide provided on the air outlet. And a heat exchanger provided on the side of the air suction port in the outer casing, and located between the heat exchanger and the air outlet in the outer casing, and In an outdoor unit for an air conditioner comprising a fan rotatably fitted in a fan guide, a cross section is taken from the air suction side to the air blow side of the fan guide portion.
While forming the Berumau scan semicircular, suction side edges blade tip of the fan and provided with Shura <br/> Udo having outlet-side edge portion, the suction side edge of the shroud and outlet
Fit the side edge into the bell mouth with a semicircular cross section.
Air conditioning apparatus outdoor unit, characterized in that the formation of the annular air circulation chamber between said bell mouth and the shroud by the. 2. An outdoor unit for an air conditioner according to claim 1, wherein the air outlet side edge of said bell mouth portion is made thicker and rounded. 3. The outdoor unit for an air conditioner according to claim 1, wherein a rectifying ring member having an elliptical cross section is provided at a central portion in the air circulation chamber. 4. An outer casing, an air inlet provided on a back side of the outer casing, an air outlet provided on a front side of the outer casing, and a fan guide provided on the air outlet. And a heat exchanger provided on the side of the air suction port in the outer casing, and located between the heat exchanger and the air outlet in the outer casing, and In an outdoor unit for an air conditioner, comprising a fan rotatably fitted in a fan guide, a diffuser is provided in the air outlet, and a tip of a hub of the fan is provided on an inner surface of the diffuser. forming a cylindrical protrusion corresponding to the motor for the fan drive in tubular projection
It is housed and installed, and the motor cooling
An outdoor unit for an air conditioner, comprising an air introduction hole .