JPH11201503A - Outdoor machine for air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the outdoor machine for an air conditioner to prevent the occurrence of a backflow to the outer peripheral part of an impeller on the high draft resistance condition of a blower and prevent reduction of heat exchange capacity due to lowering of an airflow and suppress the increase of blast noise. SOLUTION: An orifice 14 is formed by laminating together a disc-form ring 15 and a support sheet is securely arranged between the disc-form rings 15 and 15, gaps 16 at equal intervals are provided, and the inside and the outside of the orifice 14 communicates with each other. Through so formed structure, a part of air current along the outer peripheral part of an impeller 3 leaks through the gap 16 to the outside of the orifice 14 where a pressure is low and is returned to the interior of a blower 13 of an outdoor machine 17. Meanwhile, an air flow in the blower 13 flows in the part, where a pressure is very low, of the outer peripheral part of the impeller 3 through the gap 16 from the outside of the orifice 14 and an excessive negative pressure is corrected to suppress the occurrence of a backflow as a result of inflow of an air current in the blower 13, lowering of heat-exchange capacity is prevented from occurring through prevention of the occurrence of deterioration of air supply performance, turbulence of an air flow is prevented from occurring, and the increase of the generation of air supply noise is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor unit such as a separate type air conditioner used in a wide range of fields from home use to business use.

[0002]

2. Description of the Related Art In recent years, outdoor units of air conditioners typified by separate types have been installed in various places in accordance with diversification of construction circumstances, and their miniaturization, high performance and quietness have been improved. There is a strong demand.

A conventional air conditioner outdoor unit is disclosed in Japanese Utility Model Laid-Open No. 2-62727.

Hereinafter, an outdoor unit of the above-described conventional air conditioner will be described with reference to the drawings.

FIGS. 6 to 9 show the structure of an outdoor unit of a conventional air conditioner. In the figure, reference numeral 1 denotes a main body of an axial-flow type blower, 2 denotes a motor, 3 denotes an impeller in which a hub 4 is attached to the motor 2 and a plurality of blades 5 are arranged around the hub 4, and 6 Reference numeral denotes an orifice surrounding the outer periphery of the discharge side of the blade 5 of the impeller 3.

The orifice 6 has a bell mouth-shaped suction side 7.
A rib 8 formed annularly outside the bell mouth-shaped suction side 7 along the cylindrical peripheral wall 7a of the bell mouth-shaped suction side 7, and provided on the discharge side of the rib 8. It comprises a ring 9 in the shape of a trumpet and a cylindrical ring 10 installed between the cylindrical peripheral wall 7a of the bell mouth-shaped suction side 7 and the annular rib 8 and movable in the axial direction.

Reference numeral 11 denotes a main body of an outdoor unit of the air conditioner on which the blower 1 is mounted, and reference numeral 12 denotes a heat exchanger provided on a suction side of the blower 1.

The operation of the outdoor unit of the air conditioner configured as described above will be described below.

First, when the motor 2 rotates the impeller 3 in a predetermined rotation direction, the air outside the outdoor unit 11 is cooled by the heat exchanger 1.
The air is sucked into the blower 1 through the heat exchanger 2, and at this time, heat is exchanged between the outside air and the heat exchanger 12. The air sucked into the blower 1 is applied with static pressure and dynamic pressure by the action of the blade 5 and is blown out from the impeller 3 to the discharge side of the blower 1.

Normally, when the outdoor unit 11 of the air conditioner is installed in a place where there is no obstacle on the discharge side of the axial blower 1,
As shown in FIG. 7, a cylindrical ring 10 installed between a cylindrical peripheral wall portion 7 a of a bell mouth-shaped suction side 7 and an annular rib 8 is attached to a cylindrical shape of a bell mouth-shaped suction side 7. The orifice 6 is drawn out of the space between the peripheral wall 7a and the annular rib 8 in the discharge direction and installed.

In this case, since the ventilation resistance is low for the blower 1, the airflow inside the plurality of blades 5 of the impeller 3 has a large axial component and flows in the axial direction. Then, the air current blows out from the outer peripheral side 5 of the blade 5 substantially in the axial direction.
Here, since the cylindrical ring 10 is provided at the portion corresponding to the discharge side of the orifice 6, the airflow blown in the axial direction flows along the inner wall of the ring 10, and the airflow does not separate, and the blower 1 Is discharged.

On the other hand, when the outdoor unit 11 of the air conditioner on which the axial-flow type blower 1 is mounted is installed in a place where an obstacle such as an outer wall of a building is close to the discharge side of the axial-flow type blower 1,
As shown in FIG. 8, a cylindrical ring 10 provided between a cylindrical peripheral wall portion 7 a of a bell mouth-shaped suction side 7 and an annular rib 8 is attached to a cylindrical shape of a bell mouth-shaped suction side 7. It is stored between the peripheral wall 7a and the annular rib 8.

In this case, since the ventilation resistance is high for the blower 1, the axial component of the airflow decreases inside the plurality of blades 5 of the impeller 3, and the radial component increases. And
The airflow blows obliquely from the outer peripheral side 5 d of the blade 5 toward the discharge side of the orifice 6. Since the ring 9 corresponding to the discharge side of the orifice 6 spreads in a trumpet shape, the airflow flows along the inner wall of the ring 9. Therefore, even if the blower 1 has high ventilation weather, a decrease in aerodynamic performance (a decrease in air volume) can be suppressed.

[0014]

However, in the above-described configuration, the certificates for operating the blower 1 are limited, and when the blower 1 is predicted to some extent, the orifice 6 is adjusted to the discharge air flow direction of the impeller 3. The discharge side shape can be adopted, but the outdoor unit 11 of the air conditioner is
Not only the ventilation resistance of the fan 1 changes, but also the ventilation of the fan 1 depending on the operating conditions of the device on which the fan 1 is mounted, such as dew or frost on the heat exchanger 12 mounted on the outdoor unit 11 of the air conditioner. The resistance may change significantly.

For example, even if the basic operating condition is such that the outdoor unit 11 of the air conditioner is installed in a place where there is no obstacle on the discharge side of the axial flow blower 1 and the airflow resistance is low, even if the basic operating condition is an installation condition with low ventilation resistance. If dew or frost forms on the heat exchanger 12 due to, for example, the condition, the ventilation resistance to the blower 1 changes to a high condition.

In this case, as shown in FIG. 9, the axial component of the air flow decreases inside the plurality of blades 5 of the impeller 3, the radial component increases, and the air volume of the blower 1 decreases. At this time, the airflow in the blower 1 blows obliquely from the outer peripheral side 5d of the blade 5 toward the orifice 6, and a part of the airflow collides with the inner wall surface of the cylindrical ring 10 drawn and installed in the discharge direction of the orifice 6, The discharge is forcibly deflected in the axial direction, and discharge is performed. Further, a part of the airflow flows backward due to the action of the negative pressure region formed on the outer periphery of the blade 5. When a backflow occurs at the outer peripheral portion of the blade 5, it blocks the flow path of the surrounding airflow, which further reduces the airflow, and also causes turbulence noise due to the disturbance of the airflow.

As a result, the aerodynamic performance of the blower 1 deteriorates,
In addition, the noise increases and the aerodynamic performance of the blower 1 deteriorates, so that the air volume passing through the heat exchanger 12 decreases, dew / frost formation further progresses, and the heat exchange capacity of the heat exchanger 12 greatly decreases. There was a problem. Therefore, for the outdoor unit 11 of the air conditioner, it is possible to cope with a case where the operating point condition of the blower 1 greatly changes depending on the operating condition of the device other than the installation condition of the device, and suppresses the deterioration of the aerodynamic performance under the condition of high ventilation resistance. Is required.

The present invention relates to an outdoor unit of an air conditioner,
In response to a large change in the operating point condition of the blower due to the operating conditions of the equipment other than the installation condition, the operating point condition greatly changes by preventing the backflow of the air flow on the outer peripheral side of the blade of the blower. It is another object of the present invention to prevent the aerodynamic performance of the blower from deteriorating, to prevent the heat exchange capacity from lowering, and to suppress an increase in blowing noise.

[0019]

To solve this problem, an outdoor unit of an air conditioner according to the present invention comprises a motor, an axial impeller mounted on the motor, and discharge of the impeller blades. An orifice surrounding the outer periphery of the side to form an axial blower, the orifice is formed by stacking a disk-shaped ring,
A predetermined gap is provided between the disc-shaped rings and the inside and outside of the orifice communicate with each other, and a heat exchanger is provided on the suction side of the axial-flow blower. .

As a result, backflow can be prevented from occurring at the outer periphery of the impeller, aerodynamic performance can be prevented from deteriorating, heat exchange capacity can be prevented from lowering, and an increase in ventilation noise can be suppressed.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION
A motor, an axial-flow impeller attached to the motor, and an orifice surrounding the outer periphery of the blade on the discharge side of the impeller form an axial-flow blower, and the orifice is formed by stacking disk-shaped rings. An air conditioner having a structure in which a predetermined gap is provided between a disk-shaped ring and a ring, the inside and the outside of the orifice communicate with each other, and a heat exchanger is disposed on a suction side of the axial flow type blower. When the impeller of the blower rotates, the airflow component in the radial direction increases on the discharge side of the impeller, and a high pressure area is formed on the pressure surface of the outer peripheral portion of the impeller when the impeller rotates. At the same time, a very low pressure portion is formed on the suction surface side of the outer peripheral portion of the blade.

Then, a part of the airflow around the outer periphery of the impeller of the blower leaks from the gap between the disc-shaped orifices to the outside of the low-pressure orifice and returns to the inside of the blower of the outdoor unit.

On the other hand, an airflow flows into the very low pressure portion of the outer peripheral portion of the impeller from outside the orifice through a gap between the orifices and corrects an excessive negative pressure.

[0024] Therefore, there is an effect that the backflow is prevented from occurring at the outer periphery of the impeller, the aerodynamic performance is prevented from deteriorating, the heat exchange capacity is prevented from lowering, and the blowing noise is suppressed from increasing.

According to a second aspect of the present invention, an axial blower is formed by a motor, an axial impeller attached to the motor, and an orifice surrounding the outer periphery of the impeller blade on the discharge side. A plurality of slits having a predetermined angle with respect to the rotation axis are provided on the entire circumference of the orifice, and the inside and the outside of the orifice communicate with each other, and a heat exchanger is provided on the suction side of the axial flow type blower. In an outdoor unit of an air conditioner, in a condition where the ventilation resistance is high for the blower, when the impeller of the blower rotates, the airflow component in the radial direction increases on the discharge side of the impeller, and the pressure surface on the outer peripheral portion of the blade has a pressure. And a very low pressure portion is formed on the suction surface side of the outer periphery of the blade.

Then, a part of the air flow around the outer periphery of the impeller of the blower leaks from the slit provided in the orifice to the outside of the low-pressure orifice and returns to the inside of the blower of the outdoor unit.

On the other hand, an airflow flows into the very low pressure portion of the outer peripheral portion of the impeller from outside the orifice through a slit, and corrects an excessive negative pressure.

[0028] For this reason, there is an effect that the backflow is prevented from occurring at the outer periphery of the impeller, the aerodynamic performance is prevented from deteriorating, the heat exchange capacity is prevented from lowering, and the blowing noise is suppressed from increasing.

Further, since the plurality of slits are provided at a predetermined angle with respect to the rotation axis, an axial groove is formed in the orifice surface, and the blower efficiency is reduced to reduce the contact frictional resistance of the airflow flowing through the orifice surface. And has the effect of reducing the motor load.

According to a third aspect of the present invention, in the first or second aspect of the invention, the suction side of the orifice of the axial flow type blower has a trumpet-like ring shape with no gap,
The discharge side of the orifice has a structure in which the inside and outside of the orifice communicate with each other.Since a gap is provided in the orifice on the discharge side of the orifice where both a negative pressure region and a high pressure region are generated at the outer periphery of the blade, In the region, a part of the airflow around the outer periphery of the impeller of the blower leaks from the orifice gap to the outside of the low-pressure orifice and returns to the blower of the outdoor unit, while the very low-pressure portion of the outer periphery of the impeller outside the orifice The airflow flows through the gap of the orifice to correct excessive negative pressure and prevent backflow at the outer periphery of the impeller.

Further, since no gap is provided on the suction side of the orifice where no negative pressure region is generated in the outer peripheral portion of the blade, no airflow recirculating from the orifice into the blower is generated, so that there is no loss in the amount of blown air and deterioration of the blowing performance. Has the effect of preventing deterioration of the heat exchange capacity and preventing an increase in blowing noise.

Further, under the condition that the ventilation resistance is low for the blower, the blowing performance of the blower increases as the resistance of the airflow to the orifice decreases, so that the airflow between the inside and the outside of the orifice on the suction side of the orifice. Since there is no flow, the airflow performance is improved without increasing the inflow resistance at the suction opening of the orifice, and the heat exchange capacity is enhanced.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The same components as in the conventional example are denoted by the same reference numerals to avoid duplication, and description thereof is omitted.

(Embodiment 1) FIGS. 1 and 2 show an outdoor unit of an air conditioner according to Embodiment 1 of the present invention.

In FIGS. 1 and 2, reference numeral 13 denotes an axial-flow-type blower main body, reference numeral 14 denotes an orifice surrounding the outer periphery of the impeller 3 on the discharge side, and orifice 14 denotes a disk-shaped ring 15.
And a disk-shaped ring 15 and a ring 1
5, a support plate (not shown) is provided and fixed so that a gap 16 having an equal interval S is provided.
The inside and the outside have a structure communicating with each other.

With this configuration, when the impeller 3 of the blower 13 rotates under the condition that the ventilation resistance is high for the blower 13, the airflow component in the radial direction increases on the discharge side of the impeller 3, and the pressure surface on the outer periphery of the blade 5 is increased. , A high pressure area is formed, and a very low pressure portion is formed on the negative pressure side of the outer peripheral portion of the blade 5.

Therefore, a part of the airflow on the outer peripheral portion of the impeller 3 of the blower 13 is reduced by a ring 15 forming an orifice ring 14.
Orifice 14 with low pressure from gap 16 between
It leaks out and flows back into the blower 13 of the outdoor unit 17.

On the other hand, the air flow in the blower 13 flows into the very low pressure portion on the outer peripheral portion of the impeller 3 from outside the orifice 14 through the gap 16 of the orifice ring 14 to correct an excessive negative pressure.

For this reason, at the outer peripheral portion of the impeller 3, the generation of the backflow on the discharge side of the orifice 14 is suppressed, and the deterioration of the air blowing performance is prevented, the turbulence of the air flow is prevented from increasing, and the blowing noise is increased. Suppress.

(Embodiment 2) FIGS. 3 and 4 show an outdoor unit of an air conditioner according to Embodiment 2 of the present invention.

3 and 4, reference numeral 18 denotes an axial-flow-type blower main body, 19 denotes an orifice surrounding the outer periphery of the discharge side of the impeller 3, and the orbit of the impeller 3 A plurality of slits 20 are provided in parallel with the orifice 19 so that the inside and the outside of the orifice 19 communicate with each other.

With this configuration, when the impeller 3 of the blower 18 rotates under the condition that the ventilation resistance is high for the blower 18, the airflow component in the radial direction increases on the discharge side of the impeller 3, and the pressure on the outer peripheral portion of the impeller 3 increases. A high pressure region is formed on the surface, and a very low pressure portion is formed on the negative pressure surface side of the outer peripheral portion of the impeller.

Then, a part of the airflow on the outer peripheral portion of the impeller 3 of the blower 18 leaks from the slit 20 provided in the orifice 19 to the outside of the low-pressure orifice 19 and returns to the blower 18 of the outdoor unit 21.

On the other hand, an air flow flows into the very low pressure portion on the outer peripheral portion of the impeller 3 from outside the orifice 19 through the slit 20 to correct an excessive negative pressure.

Therefore, backflow is prevented from occurring at the outer periphery of the impeller 3, aerodynamic performance is prevented from deteriorating, heat exchange capacity is prevented from lowering, and an increase in blowing noise is suppressed.

Moreover, since the slit is provided in parallel with the rotation axis, an axial groove is formed on the surface of the orifice 19, and the contact friction resistance of the airflow flowing on the surface of the orifice 19 is reduced, so that the efficiency of the blower is improved. As a result, the load on the motor 2 is reduced.

In this embodiment, a plurality of slits are provided all around the orifice 1 in parallel with the rotation axis of the impeller. However, the same effect can be obtained by using a slit having an oblique angle with respect to the rotation axis. can get.

(Embodiment 3) FIG. 5 shows a blower portion of an outdoor unit of an air conditioner according to Embodiment 3 of the present invention.

In FIG. 5, reference numeral 22 denotes an axial flow type blower main body, reference numeral 23 denotes an orifice surrounding the outer periphery of the discharge side of the impeller 3, and a suction side 24 of the orifice 23 has a trumpet-like ring shape with no gap. The discharge side 25 of the orifice 23 is formed by laminating a disk-shaped ring 26, and a support plate (not shown) is provided between the disk-shaped rings 26 to fix the ring-shaped ring 26 at equal intervals. A gap 27 of S is provided, and on the discharge side 25 of the orifice 23, the inside and the outside communicate with each other.

At the discharge side 25 of the orifice 23 where both a negative pressure region and a high pressure region are generated on the outer peripheral portion of the impeller 3, the orifice 2
3 is provided with a gap 26, so that the blower 22
A part of the airflow on the outer peripheral portion of the impeller 3 leaks from the gap 26 of the orifice 23 to the outside of the low-pressure orifice 23 and returns to the blower 22 of the outdoor unit (not shown).

On the other hand, an air flow flows into the very low pressure portion of the outer peripheral portion of the impeller 3 from outside the orifice 23 through the gap 26 to correct an excessive negative pressure, and a reverse flow occurs at the outer peripheral portion of the impeller 3. To prevent the occurrence of

Further, since no gap is provided on the suction side 24 of the orifice 23 where no negative pressure region is generated on the outer peripheral portion of the impeller 3, no airflow recirculating from the orifice 23 into the blower 22 is generated, and the loss of the air volume is reduced. Therefore, by preventing the deterioration of the blowing performance, the deterioration of the heat exchange capacity is prevented and the increase of the blowing noise is prevented.

Further, under the condition that the ventilation resistance is low for the blower 22, the blowing performance of the blower 22
As the resistance at the time of flowing into the orifice 3 becomes smaller, the air blowing performance becomes higher.
Since there is no flow of the airflow between the inside and the outside of 3, the airflow performance can be improved and the heat exchange capacity can be improved without increasing the inflow resistance at the suction port of the orifice 23.

In the present embodiment, the discharge side of the orifice is formed by laminating a disk-shaped ring, and a support plate is provided between the disk-shaped rings and fixed, so that gaps at equal intervals S are formed. Although the inside and outside of the orifice are provided to communicate with each other, a plurality of slits having a predetermined angle with respect to the rotation axis are provided around the entire circumference of the orifice, and the same applies to the structure where the inside and outside of the orifice communicate. The effect of is obtained.

[0056]

As described above, according to the present invention, the motor, the axial impeller mounted on the motor, and the orifice surrounding the outer periphery of the impeller blades on the discharge side form an axial blower. The orifice is formed by laminating a disc-shaped ring, a predetermined gap is provided between the disc-shaped rings, and the inside and outside of the orifice communicate with each other. By arranging the heat exchanger on the suction side of the blower, a part of the airflow on the outer periphery of the impeller of the blower leaks out of the low-pressure orifice from the gap between the disc-shaped orifices and returns to the blower of the outdoor unit, In order to correct excessive negative pressure due to the flow of air from outside the orifice to the very low pressure part of the outer periphery of the impeller through the gap between the orifices,
Even under conditions of high ventilation resistance for the blower, the backflow can be prevented from occurring at the outer periphery of the impeller and the aerodynamic performance can be prevented from deteriorating, so that the effects of preventing a decrease in heat exchange capacity and suppressing an increase in blowing noise can be obtained.

Further, an axial flow type blower is formed by a motor, an axial flow impeller attached to the motor, and an orifice surrounding the outer periphery of the blade of the impeller on the discharge side, and rotates around the entire circumference of the orifice. By providing a plurality of slits having a predetermined angle with respect to the shaft, the inside and the outside of the orifice communicate with each other, and by disposing a heat exchanger on the suction side of the axial blower, the blades of the blower A part of the airflow around the outer periphery of the vehicle leaks out of the low-pressure orifice from the slit provided in the orifice and returns to the blower of the outdoor unit, and the very low-pressure portion of the outer periphery of the impeller passes through the slit from outside the orifice. In order to correct excessive negative pressure due to the inflow of airflow, the backflow is prevented at the outer periphery of the impeller even under conditions of high ventilation resistance for the blower, preventing aerodynamic performance from deteriorating and preventing heat exchange capacity from deteriorating. And blast The effect is obtained that suppress the increase of the sound.

Further, since the plurality of slits are provided at a predetermined angle with respect to the rotation axis, an axial groove is formed in the orifice surface, and the blower efficiency is reduced to reduce the contact frictional resistance of the airflow flowing through the orifice surface. And the effect of reducing the motor load is also obtained.

The orifice suction side of the axial-flow type blower has a trumpet-shaped ring shape with no gap, and the orifice discharge side has a structure in which the inside and outside of the orifice communicate with each other. The airflow flows from the outside of the orifice into the very low-pressure part of the impeller through the gap between the orifices and corrects the transient negative pressure. Since there is no gap on the suction side of the orifice where no negative pressure area is generated around the outer periphery of the blade,
No airflow is returned from the orifice to the inside of the blower, and there is no loss in the amount of air blown. By preventing the deterioration of the air blowing performance, it is possible to obtain the effect of preventing the deterioration of the heat exchange capability and the increase of the air blowing noise.

Further, under the condition that the ventilation resistance is low for the blower, the blowing performance of the blower becomes higher as the resistance of the airflow to the orifice becomes smaller, so that the airflow between the inside and the outside of the orifice on the suction side of the orifice. Since there is no flow, the effect of improving the air blowing performance and improving the heat exchange capacity can be obtained without increasing the inflow resistance at the suction port of the orifice.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an outdoor unit of an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view of a main part of the embodiment.

FIG. 3 is a cross-sectional view of an outdoor unit of an air conditioner according to Embodiment 2 of the present invention.

FIG. 4 is a sectional view of a main part of the embodiment.

FIG. 5 is a sectional view of a main part of an outdoor unit of an air conditioner according to Embodiment 3 of the present invention.

FIG. 6 is a cross-sectional view of an outdoor unit of a conventional air conditioner.

FIG. 7 is a sectional view of a main part of the conventional example.

FIG. 8 is a sectional view of a main part of the conventional example.

FIG. 9 is a sectional view of a main part of the conventional example.

[Explanation of symbols]

 Reference Signs List 2 motor 3 impeller 12 heat exchanger 13 axial blower 14, 19, 23 orifice 15, 26 disk-shaped ring 16, 27 gap 20 slit 24 trumpet ring

Claims (3)

[Claims] 1. A motor, an axial impeller mounted on the motor, and an orifice surrounding an outer periphery of a discharge side of a blade of the impeller, form an axial blower, wherein the orifice is a disk-shaped ring. A predetermined gap is provided between the disc-shaped rings, the inside and the outside of the orifice communicate with each other, and a heat exchanger is provided on the suction side of the axial flow type blower. Air conditioner outdoor unit. 2. An axial flow type blower is formed by a motor, an axial flow impeller attached to the motor, and an orifice surrounding an outer periphery of a discharge side of a blade of the impeller, and rotates around the entire circumference of the orifice. An outdoor unit of an air conditioner in which a plurality of slits having a predetermined angle with respect to the shaft are provided, and the inside and the outside of the orifice are configured to communicate with each other, and a heat exchanger is disposed on a suction side of the axial flow fan. . 3. The air conditioner according to claim 1, wherein the suction side of the orifice has a trumpet-shaped ring shape with no gap, and the discharge side of the orifice has a structure in which the inside and outside of the orifice communicate with each other. Outdoor unit.