JPH11132196A - Multiblade blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent blower efficiency from decreasing due to back flow from a side plate side of an impeller which is generated during pressurizing, in a multiblade blower used for a ventilating and blowing equipment. SOLUTION: An impeller 104 equipped with plural blades 104A mounted being sandwiched between a main plate 110 and a side plate 109 is formed, a spiral ventilating passage 102A starting from a tongue part 111 is formed around the impeller 104, a shaft 103A for providing rotation force to a scroll casing 102 in which a bell-mouse-shaped suction hole 105 is placed on the side plate 109 side of the impeller 104 and the main plate 110 is provided, a plate 3 which diagonally has a tilting part 1 from the side plate 109 side of the impeller 104 to the main plate 110 side and the has maximum length part 2 inside of the tongue part 111 is provided in the shaft 103A direction of the suction hole 105 toward the inside of the tongue part 111, and the tip part of the plate 3 has a bending part 4 on the impeller 104 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a multi-blade blower used for a ventilation blower.

[0002]

2. Description of the Related Art A conventional multi-blade blower is shown in FIGS.
The configuration shown in FIG.

Hereinafter, the configuration will be described with reference to the drawings. As shown in the figure, a multi-blade blower main body 101 includes a scroll casing 1 having a spiral ventilation passage 102A.
02 and an impeller 104 including a plurality of blades 104A locked inside the shaft 103A of the electric motor 103 at the end thereof.
And a suction port 105 and a discharge port 106.

In the above configuration, the rotation of the rotating shaft of the electric motor 103 causes the impeller 104 to rotate,
7 is sucked from the suction port 105, flows into the scroll casing 102, is pressurized by the rotation of the impeller 104, and is discharged from the discharge port 106.

This multi-blade blower has an outer periphery 10 of an impeller 104.
8, the peripheral speed distribution on the side plate 109 side and the main plate 110 side of the impeller 104 is not uniform, and when the static pressure of the blower increases, a backflow 112 occurs from the side plate 109 side of the impeller 104 around the tongue 111, and especially the tongue Backflow near 111
Had occurred greatly.

[0006]

In such a conventional multi-blade blower, the peripheral speed distribution on the outer plate side and the main plate side on the outer periphery of the impeller is not uniform. There is a problem that a backflow occurs from the side plate side of the impeller in the periphery, and a large backflow occurs particularly in the vicinity of the tongue. Therefore, an improvement in the efficiency of the impeller by energy saving is required.

The present invention solves such a conventional problem, and suppresses a decrease in blower efficiency due to backflow from the side plate side of the impeller, which is generated when the blower is under pressure, and efficiently returns the backflow to the blades. The characteristics of the impeller can be improved by this, and the characteristics of the impeller can be improved by facilitating the turning of the suction flow by the attraction effect, and the inclination width in the rotation direction and the reverse of the rotation direction can be improved. It is an object of the present invention to provide a multi-blade blower in which the inclination width is optimized by the size of the backflow in the axial direction and the characteristics of the impeller can be improved.

[0008]

In order to achieve the above object, a multi-blade blower according to the present invention has an impeller having a plurality of blades mounted so as to be sandwiched between a main plate and a side plate, and has a plurality of blades provided around the impeller. A scroll casing having a spiral ventilation path formed from the tongue as a starting point, a bell mouth-shaped suction port provided on a side plate side of the impeller, and a shaft for applying a rotational force to the main plate, wherein the shaft of the suction port is provided. A plate having an inclined portion obliquely from the side plate side of the impeller to the main plate side toward the inside of the tongue in the direction, and having a maximum length inside the tongue; And has a bent portion toward the impeller.

According to the present invention, it is possible to suppress a decrease in blower efficiency due to a backflow from the side plate side of the impeller, which is generated when the blower is under pressure, and to improve the characteristics of the impeller by efficiently returning the backflow to the blade. A multi-blade blower is obtained.

Another means is that a semicircular projection is provided at the end of the plate on the shaft side of the motor.

According to the present invention, the characteristics of the impeller can be reduced by suppressing a decrease in the efficiency of the blower due to the backflow from the side plate side of the impeller, which is generated when the blower is under pressure, and by easily turning the suction flow by the attraction effect. A multi-blade blower that can be improved is obtained.

Still another means is that a front end portion of the plate is provided with a folded portion on the shaft side of the electric motor.

According to the present invention, it is possible to suppress the decrease in the efficiency of the blower due to the backflow from the side plate side of the impeller, which is generated when the blower is under pressure, and to facilitate the turning of the suction flow by the attraction effect, thereby improving the characteristics of the impeller. A multi-blade blower that can be improved is obtained.

Another means is that the plate has a bent portion toward the impeller at the tip end and a semi-circular projection on the motor shaft side.

According to the present invention, it is possible to suppress a decrease in blower efficiency due to a backflow from the side plate side of the impeller, which is generated when the blower is under pressure, and to improve the characteristics of the impeller by efficiently returning the backflow to the blade. In addition, a multi-blade blower that can further improve the characteristics of the impeller by facilitating the turning of the suction flow by the attraction effect can be obtained.

Further, another means has an inclined portion formed by a plurality of straight portions or a plurality of curved portions from the side plate side of the impeller to the main plate side, with the suction port being directed axially toward the inside of the tongue portion. ,
And a plate having a maximum length inside the tongue.

According to the present invention, a decrease in the efficiency of the blower due to the backflow from the side plate side of the impeller, which is generated when the blower is under pressure, is suppressed, and the inclination width in the rotation direction and the inclination width opposite to the rotation direction are set in the axial direction A multi-blade blower that can be optimized by the size of the impeller and improve the characteristics of the impeller is obtained.

Further, another means has an inclined portion formed of a plurality of straight portions or a plurality of curved portions from the side plate side of the impeller to the main plate side, with the suction port being directed axially toward the inside of the tongue portion. ,
Further, a semicircular projection is provided on the shaft side of the electric motor at the tip of the plate having the maximum length inside the tongue.

According to the present invention, it is possible to suppress a decrease in blower efficiency due to a backflow from the side plate of the impeller, which is generated when the blower is under pressure, and to improve the characteristics of the impeller by efficiently returning the backflow to the blade. In addition, the characteristics of the impeller can be improved by facilitating the turning of the suction flow by the attraction effect, and the inclination width in the rotation direction and the inclination width in the direction opposite to the rotation direction can be increased in the axial direction of the reverse flow. Thus, a multi-blade blower that can be optimized and the characteristics of the impeller can be further improved can be obtained.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides an impeller having a plurality of blades mounted so as to be sandwiched between a main plate and a side plate, and a spiral ventilation path formed around the impeller with a tongue as a starting point. A scroll casing provided with a bell mouth-shaped suction port on the side plate side of the impeller, and a shaft for applying a rotational force to the main plate, wherein the blade is arranged inward of the tongue in the axial direction of the suction port. A plate having an inclined portion obliquely from the side plate side of the car to the main plate side, and having a maximum length portion inside the tongue portion, and having a bent portion toward the impeller at the tip end of the plate. However, because the circumferential speed distribution in the axial direction of the motor on the outer periphery of the impeller is not uniform, when the static pressure of the blower increases, backflow occurs from the side plate side of the impeller around the tongue, and especially large near the tongue. Prevent backflow with a plate and eliminate collision with suction flow Suppressing a decrease in fan efficiency,
In addition, in the backflow, the component that has flown back once is turned as a component that is returned to the blade by the bending portion, thereby improving the characteristics of the impeller.

Further, the tip of the plate is provided with a semicircular projection on the shaft side of the motor, and the circumferential speed distribution in the motor shaft direction on the outer periphery of the impeller is not uniform, so that the static pressure of the blower is large. Backflow occurs from the side plate side of the impeller around the tongue, and the backflow, which is particularly large near the tongue, is prevented by the plate, thereby suppressing a decrease in blower efficiency. The suction flow is easily turned in the radial direction of the impeller, and the suction effect is accompanied by the suction flow, so that the suction flow is easily turned as a whole, and has a function of improving the characteristics of the impeller because it flows perpendicularly to the blade.

In addition, the end of the plate is folded back on the shaft side of the motor, and the circumferential speed distribution in the axial direction of the motor on the outer periphery of the impeller is not uniform. Backflow is generated from the side plate side of the impeller in the periphery, and the backflow that is particularly large near the tongue is prevented by the plate to suppress the decrease in blower efficiency, and the folded portion causes the suction flow near the plate to be reduced. Is easily turned in the radial direction, and the suction effect is accompanied by this, so that the suction flow is easily turned as a whole, and has a function of improving the characteristics of the impeller because it flows perpendicularly to the blade.

Further, the plate has a bent portion toward the impeller at the tip end thereof and a semicircular projection on the motor shaft side, so that the peripheral speed distribution in the motor shaft direction on the outer periphery of the impeller is improved. When the blower static pressure increases because of non-uniformity, backflow occurs from the side plate side of the impeller around the tongue, and the backflow, which is particularly large near the tongue, is prevented by the plate to suppress the decrease in blower efficiency In addition, the characteristic of the impeller is improved by diverting the component that has flowed back once by the bent portion as a component returning to the blade, and the suction flow near the plate in the radial direction of the impeller is improved by the semicircular projection. The suction flow becomes easy to turn as a whole due to the attracting effect accompanying the turning, and the suction flow flows perpendicularly to the blade, thereby improving the characteristics of the impeller.

Further, the suction port has a plurality of linear portions or inclined portions formed of a plurality of curved portions from the side plate side to the main plate side of the impeller toward the inside of the tongue portion in the axial direction. Is provided with a plate with the maximum length inside the part,
Because the circumferential speed distribution in the axial direction of the motor on the outer periphery of the impeller is not uniform, when the static pressure of the blower increases, backflow occurs from the side plate side of the impeller near the tongue, and this backflow occurs particularly near the tongue. Since the amount of generation differs in the direction of rotation and in the direction opposite to the rotation of the impeller, it has the effect of improving the characteristics of the impeller by freely changing the inclination in accordance with the region where the backflow occurs.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0026]

【Example】

(Embodiment 1) The same portions as those of the conventional example are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG. 1 and FIG.
0 and a plurality of blades 104A mounted so as to be sandwiched between the side plate 109 and the impeller 10;
4 around the tongue 111 as a spiral air passage 1
02A, a scroll casing 102 provided with a bell mouth-shaped suction port 105 on the side plate 109 side of the impeller 104, and a shaft 103 for applying a rotational force to the main plate 110
A, and has an inclined portion 1 obliquely from the side plate 109 side of the impeller 104 to the main plate 110 side toward the inside of the tongue portion 111 in the direction of the axis 103A of the suction port 105,
Further, a plate 3 having a maximum length portion 2 is provided inside the tongue portion 111, and a bent portion 4 toward the impeller 104 is provided at a tip 5 of the plate 3.

With the above configuration, the scroll casing 1
A backflow 112 is generated due to a pressure difference in the inside 02, and the backflow 112 is reduced by moving away from the tongue 111 in the circumferential direction.
The flow from the suction port 105 to the impeller 104 is smoothed, and the component that has flown back once in the backflow 112 is turned by the bending portion 4 as a component that returns to the blade 104A.

As described above, a decrease in the blower efficiency due to the backflow 112 from the side plate 109 side of the impeller 104 generated when the blower is under pressure is suppressed, and the impeller 1
04, the characteristics of the impeller 104 can be improved.

In this embodiment, a multi-blade blower having a suction port on one side is used. However, a multi-blade blower having a suction port on both sides may be used, and there is almost no difference in the operation and effect.

(Embodiment 2) A description will be given with reference to FIGS.

The same portions as those in the conventional example and the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

As shown in the figure, the distal end 5 of the plate 3 is provided with a semicircular projection 6 on the shaft 103A side of the electric motor 103.

With the above configuration, the scroll casing 1
A backflow 112 is generated due to a pressure difference in the inside 02, and the backflow 112 is reduced by moving away from the tongue 111 in the circumferential direction.
The part that performs the work of the impeller 104 by smoothing the flow from the suction port 105 to the impeller 104 and making the lower part of the semicircular projection 6 negative pressure to easily turn the suction flow by the attraction effect. Increase.

As described above, the lowering of the blower efficiency due to the backflow 112 from the side plate 109 side of the impeller 104 generated when the blower is under pressure is suppressed, and the characteristics of the impeller 104 are improved by facilitating the turning of the suction flow by the attraction effect. Can be improved.

In this embodiment, a multi-blade blower having a suction port on one side is used. However, a multi-blade blower having a suction port on both sides may be used, and there is almost no difference in the operation and effect.

(Embodiment 3) A description will be given with reference to FIGS. 3 and 12.

The same parts as those in the conventional example and the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

As shown in the drawing, the end portion 5 of the plate 3 has a folded portion 7 attached to the shaft 103A of the electric motor 103.

With the above configuration, the scroll casing 1
A backflow 112 is generated due to a pressure difference in the inside 02, and the backflow 112 is reduced by moving away from the tongue 111 in the circumferential direction.
The flow from the suction port 105 to the impeller 104 is made smooth, and the lower part of the folded part 7 becomes a negative pressure by the provision of the folded part 7, thereby facilitating the turning of the suction flow by the attraction effect. To reduce the efficiency of the blower due to the backflow 112 from the side plate 109 side of the impeller 104, which is generated when the blower is under pressure, because the part that performs the work of the blower 104 is increased, and the suction flow is easily turned by the attraction effect. Thereby, the characteristics of the impeller 104 can be improved.

In the embodiment, a multi-blade blower having a suction port on one side is used. However, a multi-blade blower having a suction port on both sides may be used, and there is almost no difference in the operation and effect.

(Embodiment 4) A description will be given with reference to FIGS.

The same parts as those in the conventional example and the first embodiment are denoted by the same reference numerals, and the detailed description is omitted.

As shown in the drawing, a tip portion 5 of the plate 3 has a bent portion 4 toward the impeller, and a shaft 103A of the electric motor 103.
A semicircular projection 6 is provided on the side.

With the above configuration, the scroll casing 1
A backflow 112 is generated due to a pressure difference in the inside 02, and the backflow 112 is reduced by moving away from the tongue 111 in the circumferential direction.
The flow from the suction port 105 to the impeller 104 is smooth, and the flow of the backflow 112 is returned to the blade side 104 by the bent portion 4 and does not interfere with the flow flowing from the suction port 105, and is a semicircular projection. The lower part of 6 becomes negative pressure,
By facilitating the turning of the suction flow by the attraction effect, the portion of the impeller 104 that performs work without being affected by the backflow 112 increases.

As described above, the decrease in the efficiency of the blower due to the backflow 112 from the side plate 109 side of the impeller 104 generated when the blower is under pressure is suppressed, the backflow is efficiently returned to the impeller 104, and the suction flow is turned by the attraction effect. By making the operation easier, the characteristics of the impeller 104 can be improved.

In the embodiment, a multi-blade blower having a suction port on one side is used. However, a multi-blade blower having a suction port on both sides may be used, and there is almost no difference in operation and effect.

(Embodiment 5) A description will be given with reference to FIGS. 5 to 7 and FIG.

The same parts as those in the conventional example and the first embodiment are denoted by the same reference numerals, and the detailed description is omitted.

As shown in FIG.
In the direction A, toward the inside of the tongue 111, the inclined portion 1 composed of a plurality of linear portions 8 or a plurality of curved portions 9 is provided from the side plate 109 side of the impeller 104 to the main plate 110 side. The configuration is such that a plate 3 having a maximum length portion 2 is provided inside 111.

With the above configuration, the scroll casing 1
The backflow 112 generated due to the pressure difference in the inner stream 02 is generated particularly largely near the tongue 111, and the amount of generation differs in the rotation direction of the impeller 104 and in the direction opposite to the rotation.
The inclination can be freely changed by combining the plurality of straight portions 8 or the plurality of curved portions 9 in accordance with the generation area of the twelve, and the work of the impeller 104 can be made as efficient as possible by controlling the backflow 112.

As described above, the decrease in the efficiency of the blower due to the backflow 112 from the side plate 109 side of the impeller 104 generated when the blower is under pressure is suppressed, and the slant width L1 in the rotation direction and the slant width L2 opposite to the rotation direction are reduced. Optimizing the size in the direction of the shaft 103A can improve the characteristics of the impeller 104.

In this embodiment, a multi-blade blower having a suction port on one side is used. However, a multi-blade blower having a suction port on both sides may be used, and there is almost no difference in the operation and effect.

(Embodiment 6) A description will be given with reference to FIGS. 8 to 10 and FIG.

The same parts as those in the conventional example and the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG.
In the direction A, toward the inside of the tongue 111, the inclined portion 1 composed of a plurality of linear portions 8 or a plurality of curved portions 9 is provided from the side plate 109 side of the impeller 104 to the main plate 110 side. A semicircular protrusion 6 is provided on the shaft 103A side of the electric motor 103 at the tip of the plate having the maximum length 2 inside the inside 111.

With the above configuration, the scroll casing 1
The backflow 112 generated due to the pressure difference in the inner stream 02 is generated particularly largely near the tongue 111, and the amount of generation differs in the rotation direction of the impeller 104 and in the direction opposite to the rotation.
The inclination can be freely changed by combining a plurality of straight portions 8 or a plurality of curved portions 9 in accordance with the generation area of 12 and by controlling the backflow 112, the work of the impeller 104 can be made as efficient as possible. In addition to improving the characteristics, the lower part of the semicircular projection 6 becomes a negative pressure, so that the suction flow is easily turned by the attraction effect, so that the part of the impeller 104 that performs work increases.

As described above, a decrease in the blower efficiency due to the backflow 112 from the side plate 109 side of the impeller 104 generated when the blower is under pressure is suppressed, the turning of the suction flow is facilitated by the attraction effect, and the inclination width L1 in the rotation direction is reduced. The characteristic of the impeller can be improved by optimizing the inclination width L2 opposite to the rotation direction by the size in the direction of the reverse flow axis 103A.

In this embodiment, a multi-blade blower having a suction port on one side is used. However, a multi-blade blower having a suction port on both sides may be used, and there is almost no difference in operation and effect.

[0060]

As is apparent from the above embodiment, according to the present invention, a decrease in the efficiency of the blower caused by a backflow from the side plate side of the impeller, which is generated when the blower is under pressure, is suppressed, and this backflow is efficiently performed by the impeller. A multi-blade blower can be provided which can improve the characteristics of the impeller by returning to.

Further, it is possible to suppress the decrease in the efficiency of the blower due to the backflow from the side plate side of the impeller generated when the blower is under pressure, and to improve the characteristics of the impeller by facilitating the turning of the suction flow by the attraction effect. It can provide a multi-blade blower that can be used.

Further, it is possible to suppress a decrease in the efficiency of the blower due to the backflow from the side plate of the impeller, which is generated when the blower is under pressure, and to improve the characteristics of the impeller by efficiently returning the backflow to the blade. A multi-blade blower that can further improve the characteristics of the impeller by facilitating the turning of the suction flow by the attraction effect can be provided.

Further, it is possible to suppress the decrease in the efficiency of the blower due to the backflow from the side plate side of the impeller generated when the blower is under pressure, and to improve the characteristics of the impeller by efficiently returning the backflow to the blade. The characteristics of the impeller can be improved by facilitating the turning of the suction flow by the attraction effect, and the inclination width in the rotating direction and the inclination width in the direction opposite to the rotating direction are optimized by the size of the axial direction of the backflow, and the blade is optimized. A multi-blade blower that can further improve the characteristics of a vehicle can be provided.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a first embodiment of the present invention.

FIG. 2 is a side sectional view of the second embodiment.

FIG. 3 is a side sectional view of the third embodiment.

FIG. 4 is a side sectional view of the fourth embodiment.

FIG. 5 is a side sectional view of the fifth embodiment.

FIG. 6 is an exploded view of a plate constituted by the plurality of straight portions.

FIG. 7 is an exploded view of a plate composed of the plurality of curved portions.

FIG. 8 is a side sectional view of the sixth embodiment.

FIG. 9 is an exploded view of a plate composed of the plurality of straight portions.

FIG. 10 is an exploded view of a plate composed of the plurality of curved portions.

FIG. 11 is a perspective view of a conventional multi-blade blower.

FIG. 12 is a sectional side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inclined part 2 Maximum length part 3 Plate 4 Bent part 5 Tip part 6 Semicircular projection 7 Folding part 8 Plural straight parts 9 Plural curved parts 101 Multi-blade blower main body 102 Scroll casing 102A Ventilation passage 103 Motor 103A Shaft 104 impeller 104A blade 105 suction port 106 discharge port 107 air 108 outer periphery 109 side plate 110 main plate 111 tongue 112 backflow L1 inclination width in rotation direction L2 inclination width in reverse rotation direction

Claims (6)

[Claims] An impeller having a plurality of blades mounted so as to be sandwiched between a main plate and a side plate, and a spiral ventilation path is formed around the impeller starting from a tongue, and a side plate of the impeller is provided. A scroll casing provided with a bell mouth-shaped suction port on the side thereof, and a shaft for applying a rotational force to the main plate, wherein the main plate is arranged from the side plate side of the impeller toward the inside of the tongue in the axial direction of the suction port. A multi-blade blower having a plate having an inclined portion obliquely on its side and having a maximum length inside the tongue portion, and having a bent portion toward the impeller at a tip end of the plate. . 2. The multi-blade blower according to claim 1, wherein a semicircular projection is provided at the tip of the plate on the shaft side of the electric motor. 3. The multi-blade blower according to claim 1, wherein a bent portion is provided at a tip portion of the plate on the shaft side of the electric motor. 4. The multi-blade blower according to claim 1, wherein the plate has a bent portion toward the impeller at a tip end thereof, and a semicircular projection is provided on the shaft side of the electric motor. 5. A plurality of linear portions or a plurality of straight portions extending from the side plate side of the impeller to the main plate side, with the suction port axially inward of the tongue portion.
2. The multi-blade blower according to claim 1, further comprising a plate having an inclined portion constituted by a plurality of curved portions and having a maximum length inside the tongue portion. 6. A plurality of straight portions or a plurality of straight portions from the side plate side of the impeller to the main plate side, with the suction port being directed axially inward of the tongue portion.
3. The multi-blade blower according to claim 2, wherein a plate having an inclined portion constituted by a plurality of curved portions and having a maximum length inside the tongue portion is provided.