JP2000265993A - Blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower in which the turbulence flow is not generated on the front surfaces of respective vanes on the outside diameter side of a multiblade impeller. SOLUTION: A multiblade impeller 2 is rotatably housed in a case 1, and the multiblade impeller 2 is rotated by a rotational drive source 3. The case 1 is provided with a cylindrical parts 1a and end plated 1b, 1c for closing both end of it and has a structure in which a discharge port 4 is provided on the outer periphery of the cylindrical part 1a, and a suction port 5 is provided on one end plate 1b. The multiblade impeller 2 is formed by radially and circumferentially arranging many blast vanes 7 at constant distances, the peripheral surface is faced to the discharge port 4, and the side surface is arranged in the case 1 while being faced to the suction port 5. In the multiblade impeller 2 auxiliary vanes 10 for sectioning respective vanes are provided between mutually adjacent vanes on the outer periphery of the multiblade impeller 2 in a direction to face respective vanes 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower for blowing air by rotating a multi-blade impeller.

[0002]

2. Description of the Related Art FIGS. 3A to 3C show the structure of a conventional blower. FIG. 3A is a side view showing the inside of the conventional blower with one end plate removed. 3 (B) is a front view of the blower shown in FIG. 3 (A), and FIG.
FIG. 3A is a sectional view taken along line YY of FIG.

[0003] In this blower, a case 1, a multi-blade impeller 2 rotatably housed in the case 1, and a rotary drive source 3 comprising an electric motor for rotating the multi-blade impeller 2.
It is comprised including. The case 1 includes a tubular portion 1a and end plates 1b and 1c for closing both ends thereof, and has a structure in which a discharge port 4 is provided on the outer periphery of the tubular portion 1a and a suction port 5 is provided on one end plate 1b. Has become. This case 1
In this case, the cylindrical portion 1a and the end plate 1b are formed separately from each other and are integrated later by screwing or the like, and the cylindrical portion 1a and the end plate 1c are formed.
Is formed integrally by molding a metal plate which is a common material. The discharge port 4 is constituted by a discharge cylinder 1d protruding from the outer periphery of the cylinder 1a. The multi-blade impeller 2 is formed by arranging a large number of blower blades 7 radially on a rotating substrate 6 at regular intervals in the circumferential direction, with the circumferential surface thereof facing the discharge port 4, and the side surface thereof being formed in the suction port 5. They are arranged in the case 1 so as to face each other. The rotation drive source 3 has its rotating shaft 8 penetrated through the end plate 1 c of the case 1 and the rotating board 6 of the multi-blade impeller 2, and the rotating board 6 is fastened with a nut 9.
The multi-blade impeller 2 is fixed to the rotating shaft 8.

The noise generated from the blower having such a structure includes a turbulent flow of the airflow and an impact sound between the blower blades 7, a mechanical sound of the rotary drive source 3 composed of an electric motor, a magnetic sound, and the like. The impact noise between the flow and the blowing blade 7 is large.

In order to reduce the impact noise, it is important to suppress the turbulence of the air flow as much as possible and to create a laminarized air flow. For this reason, the number of the blowing blades 7 is increased, the interval between the adjacent blowing blades 7 is narrowed, the turbulence (separation) of the air flow on the surface of the blowing blades 7 is prevented, and the noise is reduced.

[0006]

However, since the multi-blade impeller 2 is formed by arranging a large number of blower blades 7 radially on the rotating substrate 6 at regular intervals in the circumferential direction, the inner diameter of the multi-blade impeller 2 is reduced. On the side, the interval between the adjacent blowing blades 7 is narrow,
As shown in FIG. 4, the distance between the adjacent blowing blades 7 increases as going to the outer diameter side, so that when the wind flows on the surface of each blowing blade 7, As shown in the figure, there is a problem that turbulence is generated on the surface of the blower blade 7 and noise is generated.

In order to suppress the turbulence, the interval between the adjacent blowing blades 7 must be further reduced. However, since the multi-blade impeller 2 is usually formed by a resin mold, the multi-blade impeller 2 is formed by a minimum wall thickness of a mold. There is a problem that the interval between the adjacent blowing blades 7 on the inner diameter side of the multi-blade impeller 2 is determined, and the interval between the adjacent blowing blades 7 on the outer diameter side of the multi-blade impeller 2 cannot be reduced.

An object of the present invention is to provide a blower in which turbulence does not occur on the surface of each blower blade on the outer diameter side of the multiblade impeller.

Another object of the present invention is to provide a blower which can easily narrow the interval between adjacent blow blades on the outer diameter side of the multi-blade impeller.

[0010]

SUMMARY OF THE INVENTION The present invention comprises a case, a multi-blade impeller rotatably housed in the case, and a rotary drive source for rotating the multi-blade impeller. Part and an end plate that closes both ends thereof, a discharge port is provided on the outer periphery of the cylindrical part, and a suction port is provided on one end plate, and the multi-blade impeller has a large number of radially This is an improvement of a blower in which blower blades are formed at regular intervals in a circumferential direction, the circumferential surface of which is opposed to a discharge port, and the side face of which is opposed to a suction port, which is arranged in a case. The cylindrical portion and the end plate constituting the case may be integrally formed by molding a common material, or may be integrally formed by combining separately formed components later. ,
Either may be used.

In the blower according to the present invention, the multi-blade impeller is provided with auxiliary blades for partitioning a space between the adjacent blow blades on the outer peripheral side thereof in a direction facing each blow blade. It is characterized by having been done.

In this way, when the auxiliary blades for partitioning the interval between the blower blades are arranged between the respective blower blades adjacent on the outer peripheral side of the multiblade impeller, the respective blades adjacent to each other on the outer circumferential side of the multiblade impeller are arranged. The interval becomes narrower, and the airflow also flows along the surface of each blade while maintaining a rectified state on the outer peripheral side of the multi-blade impeller, so that generation of noise can be prevented.

In the present invention, it is preferable that each auxiliary blade is set to be shorter than each blowing blade. When each of the auxiliary blades is shorter than each of the blower blades, the auxiliary blades can be easily arranged between the adjacent blower blades on the outer peripheral side of the multiblade impeller.

[0014]

1 (A) to 1 (C) show the structure of a blower according to the present invention. FIG. 1 (A) shows an example of a blower according to the present invention, in which one end plate is removed and the inside of the blower is removed. 1 (B) is a front view of the blower shown in FIG. 1 (A), and FIG.
FIG. 1C is a cross-sectional view taken along line XX of FIG.

In this blower, the multi-blade impeller 2 has an auxiliary blade 10 for separating the space between the adjacent blow blades 7 on the outer peripheral side thereof in a direction facing each blow blade 7. Each is fixed on the rotating substrate 6 in each direction. Each auxiliary blade 10 is set to a length shorter than each blowing blade 7. These auxiliary blades 10
When the multi-blade impeller 2 is molded with a resin mold, the length is determined by the minimum thickness of the mold.

FIG. 3A shows another configuration of the blower.
1 to (C).

As described above, when the auxiliary blades 10 for partitioning the space between the blower blades 7 are arranged between the adjacent blower blades 7 on the outer circumferential side of the multiblade impeller 2, the outer circumferential side of the multiblade impeller 2 is provided. The distance between the adjacent blades 7 and 10 is reduced, and the air flow also flows along the surfaces of the blades 7 and 10 while maintaining a rectified state even on the outer peripheral side of the multi-blade impeller 2, thereby preventing generation of noise. Can be. In addition, when each auxiliary blade 10 is set to be shorter than each blowing blade 7, the auxiliary blades 10 can be easily arranged between the adjacent blowing blades 7 on the outer peripheral side of the multi-blade impeller 2.

In the above example, the cylindrical body 1a and the end plate 1c are integrally formed, but they may be formed separately and integrated by screws or the like.

[0019]

In the blower according to the present invention, the auxiliary blades for partitioning the interval between the blower blades are arranged between the adjacent blower blades on the outer peripheral side of the multiblade impeller. The distance between adjacent blades on the side becomes narrower, and the air flow also flows along the surface of each blade while maintaining a rectified state on the outer peripheral side of the multi-blade impeller, so that the generation of noise can be prevented, and further Noise can be reduced.

[Brief description of the drawings]

FIG. 1A is a side view showing an example of an embodiment of a blower according to the present invention, in which one end plate is removed and the inside is disclosed;
(B) is a front view of the blower shown in (A), (C) is (A)
FIG. 3 is a sectional view taken along line XX of FIG.

FIG. 2 is an explanatory diagram showing an airflow on a multi-blade impeller in the blower of the present embodiment.

3A is a side view of a conventional blower in which one end plate is removed and the inside is disclosed, FIG. 3B is a front view of the blower shown in FIG. 3A, and FIG. It is YY line sectional drawing.

FIG. 4 is an explanatory diagram showing a flow of airflow on a multi-blade impeller in a conventional blower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 1a Tube part 1b, 1c End plate 1d Discharge cylinder part 2 Multi-blade impeller 3 Rotation drive source 4 Discharge port 5 Suction port 6 Rotating board 7 Blowing blade 8 Rotary shaft 9 Nut 10 Auxiliary blade

Claims (2)

[Claims] 1. A case, a multi-blade impeller rotatably housed in the case, and a rotation drive source for rotating the multi-blade impeller, wherein the case has an end closing both ends thereof. Plate, and a discharge port is provided on the outer periphery of the cylindrical portion, and a suction port is provided on one end plate, and the multi-blade impeller radiates a large number of blowing blades in a circumferential direction. In the blower arranged in the case with a peripheral surface thereof facing the discharge port, and a side surface thereof facing the suction port, the multi-blade impeller has A blower, wherein auxiliary blades for partitioning a space between the adjacent blow blades on the outer peripheral side are provided in directions facing the respective blow blades. 2. The blower according to claim 1, wherein each of the auxiliary blades is set to have a shorter length than each of the blower blades.