JP2008169793A - Centrifugal blower - Google Patents

Abstract

In a centrifugal blower 1, a circulating flow 15 collides with a main flow 17 flowing into an impeller 6 from a suction cylinder 8 to disturb the flow in the centrifugal direction, and the blowing efficiency is lowered. The suction cylinder 8 as a countermeasure does not have excellent workability and maintainability.
A centrifugal blower 1 includes a casing 7 that surrounds an impeller 6. A suction opening 8 has a suction drum 8. A cylindrical portion 9 and a bell whose inner diameter increases from the cylindrical portion 9 toward the upstream side. Since the mouse-shaped portion 10 and the bell-mouth-shaped portion 11 whose inner diameter increases from the cylindrical portion 9 toward the downstream side are divided into three or more in the circumferential direction, after the impeller 6 is assembled, The suction cylinder 8 can be attached to the case, and the effect of improving the blowing performance can be expected.
[Selection] Figure 1

Description

  The present invention relates to a centrifugal blower used for an air-conditioning blower, a ventilation blower, or the like.

  Conventionally, this type of centrifugal blower is fixed by sandwiching a plurality of blade plates in an annular shape between a disk-shaped main plate connected to the rotating shaft of an electric motor and a donut-shaped suction shroud that is concentric with the main plate and has a suction port at the center. There has been known one provided with an impeller and a suction cylinder that guides air to the suction port of the suction shroud (see, for example, Patent Document 1).

  Hereinafter, the centrifugal blower will be described with reference to FIG.

  As shown in the figure, the centrifugal blower 101 of Patent Document 1 includes an impeller 103 including a suction shroud 102, a conical suction cylinder 104 that is tapered toward the impeller 103, and a suction cylinder concentric with the suction cylinder 104. A cylindrical mouse piece 106 connected so that an end portion 105 of 104 protrudes inwardly, and the mouse piece 106 is inserted into a suction port 107 of the impeller 103 and fixed. In addition, when the mouse piece 106 and the suction port 107 come into contact with each other due to run-out of the impeller 103 or vibration due to imbalance, or foreign matter contained in the air to be blown is clogged, loss due to friction or generation of wear, The mouse piece 106 and the suction port 107 are configured to maintain a gap 108 so that destruction due to a collision does not occur.

In the above configuration, when the impeller 103 rotates, the air flowing from the suction drum 104 due to the pressure-increasing action of the impeller 103 flows through the mouth piece 106 from the suction port 107 to the impeller 103 in the rotation axis direction, and changes the direction in the centrifugal direction. However, since a part of the air flowing out from the suction drum 104 forms a separation vortex 109 with the mouse piece 106 at the portion where the suction drum 104 protrudes inside the mouse piece 106, In order to reduce the pressure in the portion and attract the air flow, the air flowing from the suction cylinder 104 in the direction of the rotation axis is urged to smoothly change the direction in the centrifugal direction.
Japanese Patent No. 3325574

  At this time, since the pressure of the air at the suction port 107 is lower than that of the air flowing out from the impeller 103, a part of the air flowing out from the impeller 103 passes through the gap 108 between the mouth piece 106 and the suction port 107 of the impeller 103. A circulation flow 110 is formed which again flows into the suction port 107 of the impeller 103. In such a conventional centrifugal fan 101, when the circulation flow 110 ejected from the gap 108 in the direction of the rotation axis flows into the suction port 107, the suction cylinder 104 is formed. The air flow from the suction cylinder 104 collides with the air flowing in the centrifugal direction, disturbs the flow in the centrifugal direction, and reduces the blowing performance. The circulating flow 110 collides with the air flowing in from the suction cylinder 104 and flows in the centrifugal direction. Therefore, it is required to improve the air blowing efficiency. In addition, measures that can be realized in assembly are required.

  The present invention solves such a conventional problem, and the circulation flow does not disturb the flow in the centrifugal direction by colliding with the main flow flowing into the impeller from the suction drum, and the blowing efficiency can be improved. And it aims at providing the centrifugal blower characterized by the structure excellent in construction property and maintainability.

  In order to achieve the above object, the centrifugal blower of the present invention has an electric motor, a disk-shaped main plate and a main plate connected to a rotating shaft of the electric motor in an outer shell provided with a suction opening for sucking air and a discharge opening for discharging air. And an impeller formed by annularly sandwiching a plurality of vanes with a donut-shaped suction shroud having a suction port that sucks air in the center with a concentric circle, and guides air from the outer suction opening to the suction port of the suction shroud A centrifugal blower in which the downstream end of the suction cylinder is inserted into the impeller from the suction port of the suction shroud, and a gap is provided between the suction cylinder and the suction shroud. A part of the air that flows out centrifuges the direction of the blowout from the gap of the circulating flow that is generated by flowing into the suction port from the gap between the suction cylinder and the suction shroud. And to direct the direction and the suction cylinder is obtained by a centrifugal blower, characterized in that configured divided into three or more.

  By this means, a part of the air flowing out from the impeller can be directed to the centrifugal direction in which the circulation flow formed by flowing into the impeller suction port again through the gap between the suction cylinder and the suction shroud is blown out from the gap. , The direction in which the circulating flow blows out can flow along the main flow that flows into the impeller from the suction cylinder and flows in the centrifugal direction, and the circulating flow collides with the main flow, thereby disturbing the flow in the centrifugal direction and reducing the blowing performance. It is possible to obtain a centrifugal blower with improved workability and maintainability in which the suction drum can be removed with the impeller attached while the air blowing efficiency can be improved.

  Another means is to suck air in the center concentrically with the motor and the disk-shaped main plate and main plate connected to the rotating shaft of the motor in the outer shell having the suction opening for sucking air and the discharge opening for discharging air. An impeller formed by annularly sandwiching a plurality of vanes with a donut-shaped suction shroud having a suction port, and a suction cylinder fixed to guide air from the suction opening of the outer shell to the suction port of the suction shroud A centrifugal blower in which the downstream end of the suction cylinder is inserted into the impeller through the suction port of the suction shroud, and a gap is provided between the suction cylinder and the suction shroud. The blowing direction from the gap of the circulating flow generated by flowing into the suction port from the gap between the cylinder and the suction shroud is directed to the centrifugal direction, and Inclusive cylinder is obtained by a centrifugal blower, characterized in that divided into three or more, and fitted with a coupling member to the division unit.

  By this means, a part of the air flowing out from the impeller can be directed to the centrifugal direction in which the circulation flow formed by flowing into the impeller suction port again through the gap between the suction cylinder and the suction shroud is blown out from the gap. , The direction in which the circulating flow blows out can flow along the main flow that flows into the impeller from the suction cylinder and flows in the centrifugal direction, and the circulating flow collides with the main flow, thereby disturbing the flow in the centrifugal direction and reducing the blowing performance. It is possible to obtain a centrifugal blower with improved workability and maintainability in which the suction cylinder can be removed while the impeller can be attached while the blower efficiency can be improved.

  Another means is to suck air in the center concentrically with the motor and the disk-shaped main plate and main plate connected to the rotating shaft of the motor in the outer shell having the suction opening for sucking air and the discharge opening for discharging air. An impeller formed by annularly sandwiching a plurality of vanes with a donut-shaped suction shroud having a suction port, and a suction cylinder fixed to guide air from the suction opening of the outer shell to the suction port of the suction shroud A centrifugal blower in which the downstream end of the suction cylinder is inserted into the impeller through the suction port of the suction shroud, and a gap is provided between the suction cylinder and the suction shroud. The blowing direction from the gap of the circulating flow generated by flowing into the suction port from the gap between the cylinder and the suction shroud is directed to the centrifugal direction, and Inclusive cylinders, cross a squeezing type, the minimum unit of the diameter of the impeller side, it is obtained by a centrifugal blower which is characterized by being divided into three or more.

  By this means, a part of the air flowing out from the impeller can be directed to the centrifugal direction in which the circulation flow formed by flowing into the impeller suction port again through the gap between the suction cylinder and the suction shroud is blown out from the gap. , The direction in which the circulating flow blows out can flow along the main flow that flows into the impeller from the suction cylinder and flows in the centrifugal direction, and the circulating flow collides with the main flow, thereby disturbing the flow in the centrifugal direction and reducing the blowing performance. It is possible to obtain a centrifugal blower with improved workability and maintainability in which the suction drum can be removed with the impeller attached while the air blowing efficiency can be improved.

  Another means is to suck air in the center concentrically with the motor and the disk-shaped main plate and main plate connected to the rotating shaft of the motor in the outer shell having the suction opening for sucking air and the discharge opening for discharging air. An impeller formed by annularly sandwiching a plurality of vanes with a donut-shaped suction shroud having a suction port, and a suction cylinder fixed to guide air from the suction opening of the outer shell to the suction port of the suction shroud A centrifugal blower in which the downstream end of the suction cylinder is inserted into the impeller through the suction port of the suction shroud, and a gap is provided between the suction cylinder and the suction shroud. The blowing direction from the gap of the circulating flow generated by flowing into the suction port from the gap between the cylinder and the suction shroud is directed to the centrifugal direction, and Is obtained by a centrifugal blower is characterized in that the tip portion of the write torso only manufactured with molded hard resin or rubber integral bonded.

  By this means, a part of the air flowing out from the impeller can be directed to the centrifugal direction in which the circulation flow formed by flowing into the impeller suction port again through the gap between the suction cylinder and the suction shroud is blown out from the gap. , The direction in which the circulating flow blows out can flow along the main flow that flows into the impeller from the suction cylinder and flows in the centrifugal direction, and the circulating flow collides with the main flow, thereby disturbing the flow in the centrifugal direction and reducing the blowing performance. It is possible to obtain a centrifugal blower with improved workability and maintainability in which the suction drum can be removed with the impeller attached while the air blowing efficiency can be improved.

  Another means is to suck air in the center concentrically with the motor and the disk-shaped main plate and main plate connected to the rotating shaft of the motor in the outer shell having the suction opening for sucking air and the discharge opening for discharging air. An impeller formed by annularly sandwiching a plurality of vanes with a donut-shaped suction shroud having a suction port, and a suction cylinder fixed to guide air from the suction opening of the outer shell to the suction port of the suction shroud A centrifugal blower in which the downstream end of the suction cylinder is inserted into the impeller through the suction port of the suction shroud, and a gap is provided between the suction cylinder and the suction shroud. The blowing direction from the gap of the circulating flow generated by flowing into the suction port from the gap between the cylinder and the suction shroud is directed to the centrifugal direction, and The side plate of Npera is obtained by a centrifugal blower is characterized in that fitted with guide members such as molded hard resin or rubber, or sheet metal workpiece.

  By this means, a part of the air flowing out from the impeller can be directed to the centrifugal direction in which the circulation flow formed by flowing into the impeller suction port again through the gap between the suction cylinder and the suction shroud is blown out from the gap. , The direction in which the circulating flow blows out can flow along the main flow that flows into the impeller from the suction cylinder and flows in the centrifugal direction, and the circulating flow collides with the main flow, thereby disturbing the flow in the centrifugal direction and reducing the blowing performance. It is possible to obtain a centrifugal blower with improved workability and maintainability in which the suction drum can be removed with the impeller attached while the air blowing efficiency can be improved.

  According to the present invention, the centrifugal blower can improve the blowing efficiency without colliding with the main flow flowing into the impeller from the suction cylinder and disturbing the flow in the centrifugal direction, and has excellent workability and maintainability. Can provide.

  According to a first aspect of the present invention, in order to achieve the above object, an electric motor and a disk connected to a rotating shaft of the electric motor are provided in an outer shell having a suction opening for sucking air and a discharge opening for discharging air. -Shaped main plate and an impeller formed by sandwiching a plurality of blades annularly with a donut-shaped suction shroud that is concentric with the main plate and has a suction port for sucking air in the center, and an outer suction opening at the suction port of the suction shroud And a suction cylinder fixed so as to guide air from the suction cylinder, a downstream end of the suction cylinder is inserted into the impeller through a suction port of the suction shroud, and a centrifugal is provided with a gap between the suction cylinder and the suction shroud. The blower blows out from the gap of the circulating flow generated when a part of the air flowing out from the impeller flows into the suction port from the gap between the suction cylinder and the suction shroud. The suction cylinder is divided into three or more pieces, and the workability and maintenance are improved so that the suction cylinder can be removed with the impeller attached. It has the effect of being able to.

  In addition, an outer portion having a suction opening for sucking air and a discharge opening for discharging air is provided with a motor, a disc-shaped main plate connected to the rotating shaft of the motor, and a suction port for sucking air in the center of the main plate concentrically. An impeller formed by annularly sandwiching a plurality of vanes with a donut-shaped suction shroud, and a suction cylinder fixed to guide the air from the suction opening of the outer shell to the suction opening of the suction shroud. A centrifugal blower in which the downstream end of the cylinder is inserted into the impeller from the suction port of the suction shroud, and a gap is provided between the suction cylinder and the suction shroud. A part of the air flowing out of the impeller is sucked into the suction cylinder and the suction shroud. The direction of the blowout from the gap of the circulating flow generated by flowing into the suction port from the gap between is directed to the centrifugal direction, and the suction cylinder is Divided into three or more, and is obtained by the structure of attaching the coupling member to the division unit, a centrifugal fan is obtained with improved workability and maintenance properties capable of removing the suction body.

  In addition, an outer portion having a suction opening for sucking air and a discharge opening for discharging air is provided with a motor, a disc-shaped main plate connected to the rotating shaft of the motor, and a suction port for sucking air in the center of the main plate concentrically. An impeller formed by annularly sandwiching a plurality of vanes with a donut-shaped suction shroud, and a suction cylinder fixed to guide the air from the suction opening of the outer shell to the suction opening of the suction shroud. A centrifugal blower in which the downstream end of the cylinder is inserted into the impeller from the suction port of the suction shroud, and a gap is provided between the suction cylinder and the suction shroud. A part of the air flowing out of the impeller is sucked into the suction cylinder and the suction shroud. The direction of the blowout from the gap of the circulating flow generated by flowing into the suction port from the gap between is directed to the centrifugal direction, and the suction cylinder is The cross section is a drawing type, and the impeller side is divided into three or more parts from the smallest diameter part, and it has the effect of improving the workability and maintenance that can remove the suction drum .

  In addition, an outer portion having a suction opening for sucking air and a discharge opening for discharging air is provided with a motor, a disc-shaped main plate connected to the rotating shaft of the motor, and a suction port for sucking air in the center of the main plate concentrically. An impeller formed by annularly sandwiching a plurality of vanes with a donut-shaped suction shroud, and a suction cylinder fixed to guide the air from the suction opening of the outer shell to the suction opening of the suction shroud. A centrifugal blower in which the downstream end of the cylinder is inserted into the impeller from the suction port of the suction shroud, and a gap is provided between the suction cylinder and the suction shroud. A part of the air flowing out of the impeller is sucked into the suction cylinder and the suction shroud. The direction of the blowout from the gap of the circulating flow that flows from the gap between the suction cylinder and the suction port is directed in the centrifugal direction, and the suction cylinder A centrifugal blower with improved workability and maintainability that allows the suction cylinder to be removed while the impeller is still attached, with a structure that is made of hard resin or rubber that is molded only at the end and bonded. can get.

  In addition, an outer portion having a suction opening for sucking air and a discharge opening for discharging air is provided with a motor, a disc-shaped main plate connected to the rotating shaft of the motor, and a suction port for sucking air in the center of the main plate concentrically. An impeller formed by annularly sandwiching a plurality of vanes with a donut-shaped suction shroud, and a suction cylinder fixed to guide the air from the suction opening of the outer shell to the suction opening of the suction shroud. A centrifugal blower in which the downstream end of the cylinder is inserted into the impeller through the suction port of the suction shroud and has a gap between the suction cylinder and the suction shroud. The direction of the blowout from the gap of the circulating flow generated by flowing into the suction port from the gap between It is a structure in which a guide member such as molded hard resin or rubber or sheet metal processed product is attached to the plate, and the workability and maintainability that can remove the suction drum while the impeller is attached are improved. A centrifugal blower is obtained.

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

(Embodiment 1)
As shown in FIG. 1 to FIG. 3, the centrifugal blower 1 includes a suction opening 2 for sucking air on a side surface and a discharge opening 3 for discharging air on another side surface, and an electric motor 4 and a rotating shaft 5 of the motor 4. An impeller 6 that is connected and blows air by rotation of the electric motor 4 and a casing 7 that surrounds the impeller 6 are provided. The suction opening 2 has a suction cylinder 8, a cylindrical portion 9, a bell mouth shape portion 10 whose inner diameter increases from the cylindrical portion 9 toward the upstream side, and an inner diameter increases from the cylindrical portion 9 toward the downstream side. Since the bell mouth shape portion 11 is provided, the minimum inner diameter position is the cylindrical portion 9 of the suction drum 8. The downstream end 16 of the suction cylinder 8 is located inside the impeller 6, that is, closer to the impeller 6 than the upper end of the suction shroud 13 and closer to the main plate 27.

  In the above configuration, when the impeller 6 is rotated by the electric motor 4, the outside air communicating with the suction opening 2 is introduced into the impeller 6 through the suction cylinder 8 by the pressure increasing action caused by the rotation of the blade plate 28 of the impeller 6. The air blown out from the impeller 6 is discharged outside the discharge opening 3.

  At this time, since a part of the suction cylinder 8 is inserted into the impeller 6, the air from the suction cylinder 8 is surely introduced into the impeller 6, but the impeller is more than the air flowing out of the impeller 6. Since the pressure of the air at the suction port 6 is lower, a part of the air flowing out from the impeller 6 flows into the gap 14 between the suction cylinder 8 and the suction shroud 13 to form a circulation flow 15. Since the suction cylinder 8 includes the bell mouth shape portion 11 whose inner diameter increases from the cylindrical portion 9 toward the downstream end 16, the downstream end 16 of the suction cylinder 8 is bent in the centrifugal direction, and the circulating flow 15 blows out from the gap 14. The direction can be directed to the centrifugal direction, and therefore, the main flow 17 can be made to follow, and the circulation flow 15 collides with the main flow 17 to inhibit the centrifugal flow from being disturbed and reduce the blowing performance. It is possible to improve the air blowing efficiency.

  At this time, if the suction cylinder 8 is not divided, it is impossible to realize the above configuration because it cannot be assembled. However, as shown in FIG. Since the connecting method is divided into three or more in the circumferential direction, it is possible to attach the impeller 6 to the motor 4 while assembling the suction cylinder 8 after assembling the impeller 6 to the motor 4. The centrifugal blower 1 assembled in this way can be expected to have an improved air blowing performance as described above.

(Embodiment 2)
The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIGS. 4 and 5, the suction cylinder 8 cannot be realized unless it is divided, so that the above-described configuration cannot be realized. However, the suction cylinder 8 is divided into three or more pieces. And since the coupling member 19 is attached to the divided part of the suction drum, it is possible to attach the suction drum 8 to the case while assembling the impeller 6 later. The centrifugal blower 1 assembled in this way can be expected to improve the blowing performance as described in the first embodiment.

(Embodiment 3)
The same parts as those in the first and second embodiments are denoted by the same reference numerals and detailed description thereof is omitted.

  As shown in FIG. 6, the suction drum 20 is composed of an upstream bell mouth-like portion 21 and a downstream member 23 from the minimum diameter portion 22 of the suction drum 20, and the number of downstream members 23 is three or more. Since it is divided, after the impeller 6 is assembled, the suction cylinder 20 can be attached to the bell mouth portion 21 at the upstream portion. The centrifugal blower 1 assembled in this way can be expected to improve the blowing performance as described in the first embodiment.

(Embodiment 4)
The same parts as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 7, the suction cylinder 25 is manufactured and bonded with a bell mouth portion 21 and a hard resin or rubber 24 integrally molded only on the downstream side of the minimum diameter of the suction cylinder, so that the impeller 6 is assembled. After that, the suction cylinder 25 can be attached to the case. The centrifugal blower 1 assembled in this way can be expected to improve the blowing performance as described in the first embodiment.

(Embodiment 5)
The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 8, a guide member 26 such as a molded hard resin or rubber or a sheet metal processed product is attached to the side plate of the impeller 6. According to such a configuration, the centrifugal blower 1 can be assembled by attaching the guide member 26 after inserting the suction drum 8 into the impeller 6. When the guide member 26 is made of rubber, the suction cylinder 8 can be attached with the rubber guide member 26 attached to the impeller 6. The centrifugal blower 1 assembled in this way can be expected to improve the blowing performance as described in the first embodiment.

  The present invention realizes a centrifugal blower that can improve the blowing efficiency without impinging the flow in the centrifugal direction by colliding with the main flow flowing into the impeller from the suction cylinder, and providing a centrifugal blower with good workability. It is.

The front view which shows the centrifugal air blower of Embodiment 1 of this invention. Side sectional view which shows the centrifugal blower of Embodiment 1 of this invention. Sectional drawing which shows attachment of the suction drum of the centrifugal blower of Embodiment 1 of this invention Side sectional view which shows the centrifugal blower of Embodiment 2 of this invention. Sectional drawing which shows attachment of the suction drum of the centrifugal blower of Embodiment 2 of this invention Sectional side view which shows the centrifugal blower of the centrifugal blower of Embodiment 3 of this invention Side sectional view which shows the centrifugal blower of Embodiment 4 of this invention. Side sectional view which shows the centrifugal blower of Embodiment 5 of this invention. Side sectional view showing a conventional centrifugal blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Centrifugal blower 2 Suction opening 3 Discharge opening 4 Electric motor 5 Rotating shaft 6 Impeller 7 Casing 8 Suction cylinder 9 Cylindrical part 10 Bellmouth shape part 11 Bellmouth shape part 12 Suction port 13 Suction shroud 14 Gap 15 Circulation flow 16 Downstream end 17 Mainstream 18 Joint 19 Connecting member 20 Suction cylinder 21 Bell mouth part 22 Minimum diameter part 23 Downstream member 24 Hard resin or rubber 25 Suction cylinder 26 Guide member 27 Main plate 28 Blade plate

Claims (5)

A donut shape with a suction opening for sucking air and a suction opening for sucking air in the center concentric with the main plate and the main plate in the outer shell with a suction opening for sucking air and a discharge opening for discharging air An impeller formed by annularly sandwiching a plurality of blades with a suction shroud of the suction shroud, and a suction drum fixed to guide the air from the suction opening of the outer shell to the suction shroud of the suction shroud. A centrifugal blower with the downstream end inserted into the impeller through the suction port of the suction shroud and having a gap between the suction cylinder and the suction shroud. A part of the air flowing out of the impeller is formed between the suction cylinder and the suction shroud. The blowing direction from the gap of the circulating flow generated by flowing into the suction port from the gap between them is directed to the centrifugal direction, and there are three suction cylinders. Centrifugal blower, characterized in that it is configured to split up. The centrifugal blower according to claim 1, wherein a coupling member is attached to the divided portion of the suction drum. The centrifugal blower according to claim 1 or 2, wherein the suction cylinder has a narrowed section, and the impeller side is divided into three or more parts from the smallest diameter part. The centrifugal blower according to any one of claims 1 to 3, wherein only the front end portion of the suction drum is manufactured and bonded with an integrally molded hard resin or rubber. The centrifugal blower according to any one of claims 1 to 4, wherein a guide member such as a molded hard resin or rubber or a sheet metal processed product is attached to a side plate of the impeller.

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