JP3231679B2 - Multi-wing blower - Google Patents

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 is generated from the side plate side of the impeller in the periphery, and a large backflow is generated particularly in the vicinity of the tongue. Therefore, it is required to improve the efficiency of the impeller by energy saving and to reduce noise during operation.

SUMMARY OF THE INVENTION The present invention solves such a conventional problem and suppresses a decrease in fan efficiency caused by backflow from the side plate of the impeller, which is generated when the blower is under pressure, and suppresses noise generated by the backflow. With the goal.

[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 passage formed from the tongue as a starting point, a bell mouth-shaped suction port provided on the side plate side of the impeller, and a shaft for applying a rotational force to the main plate are provided. A plate having an inclined portion obliquely from the side plate side of the impeller toward the main plate side, and having a maximum length portion inside the tongue portion.

According to the present invention, since the backflow is reduced, the right-upward portion is reduced in the air flow-static pressure characteristics, and the maximum point is also on the lower air flow side, so that the characteristics in the actual use area are improved and the efficiency is improved. . Further, a multi-blade blower capable of reducing the noise due to the backflow can be obtained.

Another means is that, in an impeller provided with a plurality of blades mounted so as to be sandwiched between a main plate and a side plate, the axial width of the plate mounted on the suction port is h, and the axial width is a maximum value. The length in the circumferential direction having b, the slope width in the rotation direction of the impeller from the end of the length in the circumferential direction is L1, the slope width in the direction opposite to the rotation direction of the impeller from the end of the width is L2, and the width of the impeller Is B, and the outer diameter of the impeller is D, and 0.15B <h <
0.45B, 0 <b <πD / 24, L1 <πD / 2, and L2 <πD / 12.

According to the present invention, there is provided a multi-blade blower in which the circumferential length at the tongue, the inclination width in the rotation direction, the inclination width opposite to the rotation direction can be optimized, and the characteristics on the high air volume side are further improved. can get.

Another means is that an impeller provided with a plurality of blades attached so as to be sandwiched between side plates from both sides of a main plate, and a spiral ventilation path is formed around the impeller with a tongue as a starting point. A scroll casing provided with a bell mouth-shaped suction port on both sides on the side plate side of the impeller and a shaft for applying a rotational force to the main plate are provided, and the side plate side of the impeller is directed toward the inside of the tongue in the axial direction of the suction port. And a plate having an inclined portion obliquely on the main plate side and having a maximum length inside the tongue portion.

According to the present invention, since the backflow is reduced, the upward-sloping portion in the airflow-static pressure characteristic is reduced, and the maximum point is also on the lower airflow side, so that the characteristic in the actual use range is improved and the efficiency is increased. Further, a multi-blade blower capable of reducing the noise due to the backflow can be obtained.

Another means is that in an impeller provided with a plurality of blades mounted so as to be sandwiched by side plates from both sides of the main plate, the axial width of the plate mounted on the suction port is h,
The circumferential length at which the axial width has the maximum value is b, the slope width in the rotational direction of the impeller from the end of the circumferential length is L1, and the slope width from the end of the width is opposite to the rotational direction of the impeller. Is L2, the width of one side of the impeller is B, and the outer diameter of the impeller is D, and
15B <h <0.45B, 0 <b <πD / 24, L1 <
The relationship of πD / 2 and L2 <πD / 12 is established.

According to the present invention, the circumferential length of the tongue in the circumferential direction, the inclination width in the rotation direction, the inclination width opposite to the rotation direction can be optimized, and the characteristics on the high air volume side can be further improved. A wing blower is obtained.

[0016]

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 axial direction of the suction port is toward the inside of the tongue from the side plate side of the impeller to the main plate side. It has a plate with an inclined portion at an angle and a maximum length inside the tongue.Since the peripheral speed distribution in the motor axial direction on the outer periphery of the impeller is not uniform, the static pressure of the blower When it gets larger, 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, which suppresses the decrease in blower efficiency and suppresses the generation of noise due to this backflow It has the effect of doing.

Further, in an impeller provided with a plurality of blades mounted so as to be sandwiched between the main plate and the side plate, the axial width of the plate mounted on the suction port is h, and the axial width has a maximum value in the circumferential direction. Is the length b, the inclination width in the rotation direction of the impeller from the end of the circumferential length is L1, the inclination width opposite to the rotation direction of the impeller from the end of the width is L2, the width of the impeller is B, and When the outer diameter of the impeller is D, 0.15B <h <0.45B, 0
<B <πD / 24, L1 <πD / 2, and L2 <πD
/ 12 is established, and the shape of the plate is defined by the outer diameter D of the impeller and the width B of the impeller. Has the effect of improving the characteristics of the side.

Further, an impeller provided with a plurality of blades attached so as to be sandwiched between side plates from both sides of the main plate, and a spiral ventilation path is formed around the impeller with a tongue as a starting point. A scroll casing provided with bell mouth-shaped suction ports on both sides on the side plate side and a shaft for applying rotational force to the main plate are provided, and the shaft is inclined from the side plate side of the impeller to the main plate side toward the inside of the tongue in the axial direction of the suction port. A plate with an inclined portion and a maximum length portion inside the tongue portion is provided, and because the circumferential speed distribution in the motor axial direction on the outer periphery of the impeller is not uniform, when the static pressure of the blower increases. Backflow is generated 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 and suppressing noise due to this backflow. Having.

Further, in an impeller having a plurality of blades attached to both sides of the main plate so as to be sandwiched between the side plates, the axial width of the plate attached to the suction port is h, and the axial width is the maximum value. The length in the circumferential direction is b, the slope width in the rotational direction of the impeller from the end of the circumferential length is L1, the slope width in the opposite direction to the rotation direction of the impeller from the end of the width is L2, When the width is B and the outer diameter of the impeller is D, 0.15B <
h <0.45B, 0 <b <πD / 24, L1 <πD /
2, and the relationship of L2 <πD / 12 is satisfied, and the shape of the plate is defined by the outer diameter D of the impeller and the width B on one side of the impeller, and the generation of noise due to the backflow is suppressed. It has the effect of suppressing more accurately and improving the characteristics on the high air volume side.

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

[0021]

【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 FIGS. 1 to 4, a plurality of blades 1 mounted so as to be sandwiched between a main plate 110 and a side plate 109.
04A, and the impeller 104
Around the tongue 111 as a spiral air passage 10
2A, a scroll casing 1 having a bell mouth-shaped suction port 105 on the side plate 109 side of the impeller 104
02 and a shaft 103A that applies a rotational force to the main plate 110,
Toward the inside of the tongue 111 in the axial direction of the suction port 105,
A plate 3 having an inclined portion 1 obliquely from the side plate 109 side of the impeller 104 to the main plate 110 side and having a maximum length portion 2 inside the tongue portion is provided.

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.
And the flow from the suction port 105 to the impeller 104 is made smooth.

As described above, according to the multi-blade blower of the first embodiment of the present invention, since the backflow is reduced, the right-upward portion becomes smaller due to the airflow-static pressure characteristic, and the maximum point is further reduced to the lower airflow side. The characteristics in the use area are improved and the efficiency is improved. Also, the noise due to this backflow is reduced.

(Embodiment 2) A description will be given with reference to FIG. 1 and FIGS.

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 figure, the axial width of the plate 3 attached to the suction port 105 is h, the circumferential length at which the axial width has the maximum value is b, and the end of the circumferential length is b. Impeller 104
L1 is the inclination width in the rotation direction, and the impeller 104
The inclination width opposite to the rotation direction of L is L2, the width of impeller 104 is B, and the outer diameter of impeller 104 is D, and 0.15B
<H <0.45B, 0 <b <πD / 24, L1 <πD /
2. The configuration is such that the relationship of L2 <πD / 12 holds.

With the above configuration, it is possible to optimize the circumferential length of the tongue 111, the inclination width in the rotation direction, and the inclination width opposite to the rotation direction.

As described above, according to the multi-blade blower of the second embodiment of the present invention, noise generation due to backflow is more accurately suppressed than in the first embodiment, and the characteristics on the high air volume side are further improved.

(Embodiment 3) 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 figure, a plurality of blades 1 attached to both sides of the main plate 110 so as to be sandwiched by side plates 109 are provided.
04A, and the impeller 104
Around the tongue 111 as a spiral air passage 10
2A, a scroll casing 102 provided on both sides with a bell mouth-shaped suction port 105 on the side plate 109 side of the impeller 104, and a shaft 103A for applying a rotational force to the main plate 110 are provided. From the side plate 109 side of the impeller 104 toward the inside of the portion 111, the main plate 11
A plate 3 having an inclined portion 1 obliquely on the 0 side and a maximum length portion 2 inside the tongue portion 111 is provided.

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.
And the flow from the suction port 105 to the impeller 104 is made smooth.

As described above, according to the multi-blade blower of the third embodiment of the present invention, the backflow is reduced, so that the right-upward portion is reduced due to the airflow-static pressure characteristic, and the maximum point is further reduced to the lower airflow side. The efficiency in the usage area is improved and the efficiency is improved. Also, the noise due to this backflow is reduced.

(Embodiment 4) A description will be given with reference to FIG. 7 and 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, the axial width of the plate 3 attached to the suction port 105 is h, the circumferential length of the axial width having the maximum axial value is b, and the end of the circumferential length is b. Impeller 104
L1 is the inclination width in the rotation direction, and the impeller 104
Where L2 is the inclination width opposite to the rotation direction, B is the width of one side of the impeller 104, and D is the outer diameter of the impeller 104.
5B <h <0.45B, 0 <b <πD / 24, L1 <π
The configuration is such that the relationship of D / 2, L2 <πD / 12 holds.

With the above configuration, it is possible to optimize the circumferential length of the tongue 111, the inclination width in the rotation direction, and the inclination width opposite to the rotation direction.

As described above, according to the multi-blade blower of the fourth embodiment of the present invention, noise generation due to backflow is more accurately suppressed than in the third embodiment, and the characteristics on the high air volume side are further improved.

[0040]

As is clear from the above embodiment, according to the present invention, the backflow is reduced, the rightward rising portion is reduced in the airflow-static pressure characteristic, and the maximum point is further reduced to the lower airflow side. The characteristics in the use area are improved and the efficiency is improved. Further, it is possible to provide a multi-blade blower having an effect of reducing noise due to the backflow.

Further, by optimizing the circumferential length at the tongue, the inclination width in the rotation direction, and the inclination width opposite to the rotation direction, the generation of noise due to the backflow is more accurately suppressed, and A multi-blade blower with improved characteristics can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of essential parts of Embodiments 1 and 2 of the present invention.

FIG. 2 is a sectional side view of the same.

FIG. 3 is a development view of the same plate.

FIG. 4 is a characteristic diagram of the air volume-static pressure and the air volume-efficiency.

FIG. 5 is a perspective view of a suction port and a plate according to the second embodiment.

FIG. 6 is an exploded view of the same plate.

FIG. 7 is an exploded perspective view of essential parts of the third and fourth embodiments.

FIG. 8 is a sectional side view of the same.

FIG. 9 is a development view of the same plate.

FIG. 10 is a characteristic diagram of the air volume-static pressure and the air volume-efficiency.

FIG. 11 is a perspective view of a suction port and a plate according to the fourth embodiment.

FIG. 12 is an exploded view of the same plate.

FIG. 13 is a perspective view of a conventional multi-blade blower.

FIG. 14 is a sectional side view of the same.

[Explanation of symbols]

 Reference Signs List 1 inclined portion 2 maximum length portion 3 plate 101 multi-blade blower main body 102 scroll casing 102A ventilation passage 103 electric 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 B Width of impeller D Outer diameter of impeller h Width in axial direction b Length in circumferential direction where axial width has maximum value L1 Slope width in rotation direction L2 Slope width opposite to rotation direction

Claims (4)

(57) [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 a slant portion on the side and a maximum length inside the tongue. 2. An axial width of the plate attached to the suction port is h, a circumferential length of the plate having the maximum axial width is b,
From the end of the circumferential length, the inclination width in the rotation direction of the impeller is L1, from the end of the width, the inclination width opposite to the rotation direction of the impeller is L2, the width of the impeller is B, and the blade is 0.15B <h <0.45B, 0 <
b <πD / 24, L1 <πD / 2, and L2 <πD /
2. The multi-blade blower according to claim 1, wherein the relationship of 12 is satisfied. 3. An impeller having a plurality of blades attached so as to be sandwiched between side plates from both sides of a main plate, and a spiral ventilation path formed around the impeller with a tongue as a starting point,
A scroll casing provided with bell mouth-shaped suction ports on both sides on the side plate side of the impeller, and a shaft for applying a rotational force to the main plate, wherein the blades face the inside of the tongue in the axial direction of the suction ports. A multi-blade blower having an inclined portion obliquely from a side plate side of a car to a main plate side and having a plate having a maximum length inside the tongue portion. 4. An axial width of the plate attached to the suction port is h, and a circumferential length of the plate at which the axial width has a maximum value is b.
From the end of the circumferential length, the inclination width in the rotation direction of the impeller is L1, from the end of the width, the inclination width opposite to the rotation direction of the impeller is L2, the width of one side of the impeller is B, and When the outer diameter of the impeller is D, 0.15B <h <0.45
B, 0 <b <πD / 24, L1 <πD / 2, and L2
The multi-blade blower according to claim 3, wherein a relationship of <πD / 12 is satisfied.