JPH04353300A - Blower - Google Patents

Abstract

PURPOSE:To furnish a blower which prevents a current flowing in from the suction side of an impeller from blowing out in the outer periphery of the impeller and colliding with a current flowing in from the outer periphery in the outer peripheral part of the impeller and restrains increase of blowing noise of a blower and deterioration of blowing performance in the case when the blower is driven under the condition where ven ventilating resistance is higher than a designed operating point. CONSTITUTION:This blower is constituted of a cylindrical ring 13 fixed on an edge 6a on the suction side of an orifice 6 and surrounding the outer periphery of a blade 5 which is not surrounded by the orifice 6 and a cylindrical body 14 positioned inside of the ring 13 surrounding a suction side 5a of the outer periphery of the blade 5 which is not surrounded by the orifice 6 and formed of thin cylindrical members 14a, 14b, 14c whose length to surround the suction side 5a of the blade 5 is longer toward outside and has spaces A and B respectively between the ring 13 and the cylindrical body 14 and between the thin cylindrical members. Additionally, the edge part of the suction side of the ring 13 and the edge part of the suction side of the cylindrical body 14 are on the same surface.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower used in an air conditioner or the like.

0002

[Background Art] In recent years, blowers such as axial flow fans have been widely used as blowers for separate air conditioners, from commercial to home use, and are becoming more and more compact as equipment becomes smaller and the installation conditions for equipment become more diverse. Accordingly, there is a tendency for higher performance and lower noise to be desired.

[0003] The above-mentioned conventional blower will be explained below with reference to the drawings. Figures 4 and 5 show the structure of a conventional axial-flow blower, and Fig. 6 shows the structure of an outdoor unit of a separate air conditioner equipped with a conventional axial-flow blower. . In the figure, 1 is an axial blower, and 2 is a motor. 3 is an impeller consisting of a hub 4 attached to the motor 2 and a plurality of blades 5 provided around the hub 4. Reference numeral 6 denotes an orifice surrounding the outer periphery of the discharge side 5c of the blade 5. 7 is an outdoor unit of a separate type air conditioner, and 8 is a box body of the outdoor unit 7. 9 is a heat exchanger provided on the suction side of the blower 1, and 10 is a compressor provided inside the box 8. 11
is a fan guard provided on the discharge side of the blower 1.

The operation of the axial flow type blower constructed as described above will be explained below. First, when the impeller 3 is rotated in a predetermined rotational direction by the motor 2, the air that has passed through the heat exchanger 9 and has been heat exchanged flows into the impeller 3 and the impeller 5
Due to the action of , static pressure and dynamic pressure are added to the air, which is discharged outside the impeller 3 to perform a blowing action.

[0005]

[Problems to be Solved by the Invention] However, with the above configuration, as shown in FIG. When installed and operated under conditions where the ventilation resistance is higher than the designed operating point, the axial velocity component of the airflow flowing in from the suction side 5a of the blades 5 of the impeller 3 decreases, and the radial velocity increases, as shown in FIG. As the component increases, the flow W1 becomes inclined toward the outer periphery, blows out to the outer periphery of the blade 5 that is not surrounded by the orifice 6, and collides with the airflow X1 flowing in from the outer periphery, so the flow becomes large at the outer periphery 5b of the blade 5. Disturbed.

[0006] Furthermore, the inflow of airflow X1 from the outer periphery is obstructed. Therefore, the turbulence noise generated from the impeller 3 increases, the air blowing noise of the blower 1 increases, and the air blowing performance also deteriorates. Therefore, when the blower 1 is operated under conditions where the ventilation resistance is higher than the designed operating point, there is a problem in that it is necessary to suppress an increase in the blowing noise of the blower 1 and a deterioration in the blowing performance.

The present invention has been made in view of the above problems, and when the blower is operated under conditions where the ventilation resistance is higher than the designed operating point, the airflow flowing in from the suction side of the impeller is blown out to the outer periphery of the impeller. To provide a blower that prevents the outer periphery from colliding with the airflow flowing in from the outer periphery, smoothly returns the airflow blown to the outer periphery of the impeller to the suction side of the blade, and suppresses the increase in blower noise and deterioration of blower performance. It is something to do.

[0008]

[Means for Solving the Problems] In order to solve this problem, a blower of the present invention includes a motor, a hub attached to the motor, and a plurality of blades provided around the hub. a cylindrical ring fixed to the suction side end of the orifice and surrounding the outer periphery of the blade that is not surrounded by the orifice; a cylindrical body formed of a thin-walled cylindrical member located inside the ring, surrounding the suction side of the outer periphery of the blade that is not surrounded by the orifice, and having a longer length as the outer side surrounds the suction side of the earlier blade; , a space is provided between the ring and the cylindrical body and between the thin cylindrical members.

[0009] Also, the suction side ends of the ring and the cylindrical body are on the same surface.

0010

[Operation] With this configuration, when the blower is operated under conditions where the ventilation resistance is higher than the designed operating point, the airflow blown out from the suction side of the blade to the outer periphery is separated from the airflow flowing in from the outer periphery at the outer periphery of the blade. A space between the outer periphery of the blade and the innermost thin cylindrical member of the cylindrical body, a space between the thin cylindrical members of the cylindrical body,
The blades are successively divided from the suction side of the blade into the space between the outermost thin cylindrical member of the cylinder and the ring, and smoothly return to the suction side without mutual interference and are sucked into the impeller again.

Furthermore, due to the viscosity of the airflow sucked in from the suction side of the blade, by making the suction side ends of the ring and the cylindrical body on the same surface, the air on the outer circumferential side is also drawn toward the suction side of the blade, and the blade It merges with the airflow on the intake side and is sucked into the car.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In order to avoid duplication, the same reference numerals are given to the parts having the same configuration as those of the conventional example, and the explanation thereof will be omitted.

FIGS. 1 and 2 show the structure of an axial flow type blower according to an embodiment of the present invention, and FIG. 3 shows a separate type blower equipped with an axial flow type blower according to an embodiment of the present invention. This shows the structure of an outdoor unit of an air conditioner.

In the figure, reference numeral 12 denotes an impeller 3 consisting of a motor 2, a hub 4 attached to the motor 2, a plurality of blades 5 provided around the hub 4, and a discharge side 5c of the blades 5. an orifice 6 surrounding the outer periphery of the blade 5; a cylindrical ring 13 fixed to the suction side end 6a of the orifice 6 and surrounding the outer periphery of the blade 5 that is not surrounded by the orifice 6; It is composed of a cylindrical body 14 that surrounds the suction side 5a of the outer circumference of the blade 6 that is not surrounded by the orifice 6, and is formed of thin-walled cylindrical members 14a, 14b, and 14c that are longer toward the outside and surround the suction side 5a of the blade 5. This is an axial flow type blower having spaces A and B between the ring 13 and the cylindrical body 14 and between the thin cylindrical members, respectively.

Furthermore, the end of the ring 13 on the suction side and the end of the cylindrical body 14 on the suction side are on the same plane.

The operation of the impeller of the axial flow type blower constructed as described above will be explained below.

First, when the impeller 3 is rotated in a predetermined rotational direction by the motor 2, air that has passed through the heat exchanger 9 and has been heat exchanged flows into the impeller 3, and due to the action of the impeller 5, the static pressure and the dynamic The air is discharged outside the impeller 3 under pressure, and the air blower 12 performs a blowing action.

Here, when the blower 12 is operated under conditions where the ventilation resistance is higher than the designed operating point, as shown in FIG.
As shown in FIG. 2, the airflow W1 blown out from the suction side 5a of the blade 5 to the outer periphery of the blade 5 is prevented from separating and colliding with the airflow X1 flowing in from the outer periphery at the outer periphery 5b of the blade, and
The airflow W1 blown out to the outer periphery is caused by the space C between the outer periphery 5b of the blade 5 and the innermost thin cylindrical member 14c of the cylindrical body 14, and the space B1 between the thin cylindrical members 14c and 14b of the cylindrical body 14.
, a space B2 between the thin cylindrical members 14b and 14a, and a space A between the outermost thin cylindrical member 14a of the cylindrical body 14 and the ring 13, starting from the suction side of the outer circumference 5b of the blade 5. They smoothly return to the suction side without interfering with each other and are sucked into the impeller 3 again.

Furthermore, due to the viscosity of the airflow sucked in from the suction side 5a of the blade 5, the ends of the ring 13 and the suction side of the cylindrical body 14 are flush with each other, so that the air X1 on the outer peripheral side also flows into the suction side 5a of the blade 5. The air flows through the ring 13 and the cylindrical body 14 and is not obstructed when the impeller 3 merges with the air flow on the suction side and is sucked in.

As described above, according to this embodiment, the cylindrical ring 13 is fixed to the suction side end 6a of the orifice 6 and surrounds the outer periphery of the blade 5 that is not surrounded by the orifice 6.
and thin-walled cylindrical members 14a, 14b, 14c located inside the ring 13, surrounding the suction side 5a of the outer circumference of the blade 5 that is not surrounded by the orifice 6, and having a longer length as the outer side surrounds the suction side 5a of the blade 5. It has spaces A and B between the ring 13 and the cylindrical body 14 and between the thin cylindrical members, respectively. By making the ends on the suction side flush with each other, when the blower 12 is operated under conditions where the ventilation resistance is higher than the designed operating point, the airflow W1 blown out from the suction side 5a of the blades 5 to the outer periphery of the blades 5.
is separated from and collides with the airflow X1 flowing in from the outer periphery at the outer periphery 5b of the blade, and the airflow W blown out to the outer periphery is suppressed.
1 is a space C between the outer peripheral part 5b of the blade 5 and the innermost thin cylindrical member 14c of the cylindrical body 14, a space B between the thin cylindrical members 14c, 14b, 14a of the cylindrical body 14, and a space B between the thin cylindrical members 14c, 14b, 14a of the cylindrical body 14. The space A between the outermost thin-walled cylindrical member 14a and the ring 13 is divided one after another from the suction side of the outer circumferential portion 5b of the blade 5, and smoothly returns to the suction side without mutual interference and returns to the inside of the impeller 3. be sucked into. Furthermore, due to the viscosity of the airflow sucked in from the suction side 5a of the blade 5, the air X1 on the outer peripheral side is also drawn toward the suction side 5a of the blade 5, merges with the airflow on the suction side, and is sucked into the impeller 3. Therefore, when the blower 12 is operated under conditions where the ventilation resistance is higher than the designed operating point, it is possible to suppress an increase in the air blowing noise of the blower 12 and also to suppress deterioration of the air blowing performance.

[0021]

As described above, the present invention provides an impeller including a motor, a hub attached to the motor, a plurality of blades provided around the hub, and an impeller on the discharge side of the blade. a cylindrical ring fixed to the suction side end of the orifice and surrounding the outer periphery of the vane that is not surrounded by the orifice; and a cylindrical ring located inside the ring and attached to the orifice. a cylindrical body formed of a thin-walled cylindrical member that surrounds the suction side of the unenclosed outer periphery of the vane, and the length of which is longer toward the outside to surround the suction side of the earlier vane; By having a space between the cylindrical members and by making the suction side ends of the ring and the cylindrical body on the same surface, when the blower is operated under conditions where the ventilation resistance is higher than the design operating point, the blades The airflow flowing in from the suction side of the car is blown out to the outer periphery of the impeller, and is prevented from colliding with the airflow flowing in from the outer periphery at the outer periphery of the impeller.

Furthermore, by making the suction side ends of the blades on the same surface, the airflow blown out to the outer periphery of the impeller is smoothly returned to the suction side, thereby suppressing an increase in the blowing noise of the blower and deterioration of the blowing performance. can.

[Brief explanation of the drawing]

[Fig. 1] Cross-sectional view of an axial blower according to an embodiment of the present invention

[Fig. 2] A sectional view of the main parts of the present invention when the blower is operated under conditions where the ventilation resistance is higher than the designed operating point.

FIG. 3 is a sectional view of an outdoor unit of a separate air conditioner equipped with an axial blower according to an embodiment of the present invention.

[Figure 4
】Cross-sectional view of a conventional axial flow blower

[Figure 5] A cross-sectional view of conventional main parts when the blower is operated under conditions where the ventilation resistance is higher than the designed operating point.

[Figure 6] Cross-sectional view of the outdoor unit of a separate air conditioner equipped with a conventional axial flow blower

FIG. 7 is an aerodynamic characteristic diagram showing design operating points and operational operating points of an axial-flow type blower according to an embodiment of the present invention and a conventional axial-flow type blower.

[Explanation of symbols]

2 Motor 3 Impeller 4 Hub 5 Feather 5a Suction side 5c Discharge side 6 Orifice 6a end 12　Blower 13 Ring 14 Cylindrical body 14a, 14b, 14c Thin cylindrical member A Space B Space

Claims (2)

[Claims] 1. An impeller including a motor, a hub attached to the motor, and a plurality of blades provided around the hub, an orifice surrounding the outer periphery of the blade on the discharge side, a cylindrical ring surrounding the outer periphery of the blade that is not surrounded by the orifice from the suction side end of the orifice; and a cylindrical body formed of a thin-walled cylindrical member whose length is longer toward the outside surrounding the suction side of the blade, the blower having a space between the ring and the cylindrical body and between the thin-walled cylindrical members. [Claim 2] A blower characterized in that the suction side ends of the ring and the cylindrical body are flush with each other.