WO2016143086A1

WO2016143086A1 - Centrifugal blower

Info

Publication number: WO2016143086A1
Application number: PCT/JP2015/057117
Authority: WO
Inventors: 裕一矢田
Original assignee: 三菱電機株式会社
Priority date: 2015-03-11
Filing date: 2015-03-11
Publication date: 2016-09-15

Abstract

In the present invention, a centrifugal blower is provided with: a fan casing having a suction intake in a top panel and an outlet in a bottom panel; a fan member that is disposed inside the fan casing and rotates in the inside of the fan casing; a motor that is coupled to the fan member and drives the fan member to rotate; and a bell mouth disposed between the suction intake of the fan casing and the fan member. The fan member comprises a disc-shaped introduction panel section having an air introduction hole, a disc-shaped back panel section arranged so as to face the introduction panel section, and a plurality of vane panel sections provided in a peripheral direction so as to couple the introduction panel section and the back panel section together. A peripheral edge of one end opening of the bell mouth is integrally connected over the entire periphery to the introduction panel section of the fan member. A peripheral edge of the other end opening of the bell mouth and a peripheral edge of the suction intake of the fan casing are coupled without contact, via a non-contact seal structure constituted of a labyrinth seal. Circulation of air inside the centrifugal blower due to air leakage from a gap between the bell mouth and the fan member is reduced.

Description

Centrifugal blower

The present invention relates to an improvement in the efficiency of a centrifugal fan, particularly a turbo fan.

2. Description of the Related Art Conventionally, a suction port structure of a turbofan is separate from a suction portion structure fixed to a casing and a suction portion structure of a fan, and contact is prevented by providing a certain amount of gap in the radial direction. Although high fan efficiency is required, providing a gap causes air to circulate and reduce fan efficiency. Therefore, a structure has been proposed in which the air flowing between the gaps is reduced while allowing the gaps.
In Patent Document 1, the suction portion structure and the fan suction portion structure are separate from each other, and have a structure in which a seal material that is worn by contact with the shroud is provided and rotated to be a minimum gap after installation.
In Patent Document 2, a fan and a bell mouth are integrated, but sealing is performed in a shape like that of Example 1 (FIGS. 2A and 2B) in the document.

JP 2010-138700 A JP-A-11-94284

In a conventional turbofan, the suction port structure (casing side bell mouth) fixed to the casing is separate from the fan suction portion structure (fan bell mouth), and a certain amount of gap is provided in the radial direction. However, if the gap is narrowed to increase the efficiency, the risk of interference increases. In order to prevent interference, related parts are required to have high dimensional accuracy and assembly accuracy, and the cost also increases. In patent document 1, there is a possibility that the sealing material may not be cut off during installation and may be scattered during operation. Further, in Patent Document 2, the bell mouth and the fan are integrated, but the seal on the outer periphery of the bell mouth is not sufficient, and air flows out from the outer periphery of the bell mouth more than the leakage improvement by integration, and the fan efficiency is improved. There was a problem of getting worse.

The present invention has been made to solve the above-described problems, and aims to minimize the leakage of air from between the fixed part and the rotating part of the centrifugal blower and improve the fan efficiency.

A centrifugal blower according to the present invention is connected to a fan casing having a suction port on one side surface and a blower outlet on the other side surface, a fan member that is arranged in the fan casing and rotates inside the fan casing, and the fan member. A fan for rotating the fan member, and a bell mouth disposed between the suction port of the fan casing and the fan member, and the fan member has a disk-like introduction plate portion having an air introduction hole; A fan-shaped introduction plate comprising: a disc-shaped back plate portion facing the introduction plate portion; and a plurality of blade plate portions provided in the circumferential direction connecting the introduction plate portion and the back plate portion. The peripheral edge of the one end opening of the bell mouth is integrally connected to the part, and the peripheral edge of the other end opening of the bell mouth and the peripheral edge of the suction port of the fan casing are non-contacted via a non-contact seal structure. Connect by contact It is what is.

In the centrifugal blower of the present invention, the peripheral edge portion of the one end opening of the bell mouth is integrally connected to the introduction plate portion of the fan member over the entire periphery, the peripheral edge portion of the other end opening of the bell mouth, and the peripheral edge of the suction opening of the fan casing Since the portion is connected in a non-contact manner through a non-contact seal structure, air leakage from between the bell mouth and the fan casing can be minimized. Thereby, the circulation in a casing can be reduced further and fan efficiency can be improved. In addition, there is an effect that dimensional management can be performed very easily.

It is a side view including the partial cross section of the centrifugal blower in Embodiment 1 of this invention. It is a figure which shows the fan member of the said centrifugal blower, Comprising: (a) is a top view, (b) is a bottom view. It is a fragmentary sectional side view which shows the principal part of the said centrifugal blower. It is a schematic diagram of the flow of the air in the said centrifugal blower. It is sectional drawing of the conventional centrifugal fan casing. It is a schematic diagram which shows the flow of the air in the said centrifugal blower. (A)-(g) is a partial schematic sectional side view which shows the various modifications of the non-contact sealing structure of the centrifugal blower in Embodiment 2 of this invention. It is a schematic internal block diagram which shows the inside of the air conditioner to which the centrifugal air blower in Embodiment 3 of this invention is applied. It is a fragmentary sectional side view of the centrifugal air blower integrated in the said air conditioner.

Embodiment 1 FIG.
1 is a cross-sectional view of the inside of a fan casing of a centrifugal blower according to Embodiment 1 of the present invention.
In FIG. 1, a centrifugal blower according to this embodiment includes a fan casing 1 formed in a cylindrical shape or a polygonal shape, a fan member 2 disposed in the fan casing 1, and a motor that rotationally drives the fan member 2. 3, and a bell mouth 4 provided between the fan casing 1 and the fan member 2. In the fan casing 1, a suction port 1 B having a circular shape in plan view is formed on a top plate 1 A that is a side surface on one end, and a blower outlet 1 D having a circular shape in plan view is formed on a bottom plate 1 C that is a side surface on the other end. The motor 3 is configured such that its rotational drive shaft 3A is connected to a back plate portion 2B (detailed later) of the fan member 2 to rotationally drive the fan member 2. This motor 3 is fixed to the inner wall of the air conditioning unit casing (not shown in FIG. 1) outside the blower, the outside, the fan casing 1 or the like. Due to the configuration of the motor 3 described above, the fan member 2 is arranged to rotate around the cylinder center C of the fan member 2. In some cases, the front surface of the bottom plate 1C is opened to form the air outlet 1D.

As shown in FIG. 2, the fan member 2 includes an introduction plate portion 2A formed in the shape of a disc with a hole in a plan view, and a planar view disc disposed facing the introduction plate portion 2A at a position below the introduction plate portion 2A. A plurality of rear plate portions 2B, and an introduction plate portion 2A and a back plate portion 2B are arranged apart from each other in the circumferential direction (arrow R direction) to connect the introduction plate portion 2A and the back plate portion 2B. The

blade plate portions

2C, 2C, 2C,. The introduction plate portion 2 A is formed with an air introduction hole 2 D having a circular shape in plan view for taking air into the fan member 2. And between the blade-

plate parts

2C and 2C adjacent to the circumferential direction is the fan blower outlet 2E which blows off air, respectively. And the peripheral part 4B of the one end opening 4A of the bell mouth 4 is integrally connected to the upper surface of the peripheral part of the introduction plate part 2A over the entire periphery. Furthermore, the peripheral edge portion 4D of the other end opening 4C of the bell mouth 4 and the peripheral edge portion 1E of the suction port 1B of the fan casing 1 are connected in a non-contact manner via a non-contact seal structure 5.

For example, a labyrinth seal structure 6 is employed as the non-contact seal structure 5. The labyrinth seal structure 6 is configured such that the first ring-shaped member 7 and the second ring-shaped member 8 face each other through the gap S in a non-contact manner as shown in an enlarged view in FIG. The first ring-shaped member 7 is attached to the entire surface of the face 4E facing the peripheral edge 1E of the fan casing 1 at the peripheral edge 4D of the other end opening 4C of the bell mouth 4. For example, two second ring-

shaped members

8 and 8 are attached to the entire surface of the peripheral surface 1F of the peripheral portion 1E of the suction port 1B of the fan casing 1 facing the peripheral portion 4D of the bell mouth 4. The two second ring-

shaped members

8 and 8 are arranged on both sides of the first ring-shaped member 7 through gaps S, S, S,... .

Next, the operation will be described. As shown in FIGS. 1 to 4, first, when the motor 3 is driven, the fan member 2 and the bell mouth 4 are integrally rotated in the direction of the arrow R around the cylindrical center C. Thereby, air is smoothly drawn in from 4C of the bell mouth 4, and is sent into the fan member 2 through the air inlet 2D. The air sent into the fan member 2 is blown into the fan casing 1 in the centrifugal direction from the

fan outlets

2E, 2E, 2E,. After the direction is changed in the direction of the cylinder center C in the casing 1, the air is blown out from the blower outlet 1 D. At this time, the pressure of the air blown out from the

fan outlets

2E, 2E, 2E,... Of the fan member 2 is higher than the pressure of the air near the other end opening 4C of the bell mouth 4. However, since the non-contact seal structure 5 exists between the peripheral edge 4D of the other end opening 4C of the bell mouth 4 and the peripheral edge 1E of the suction port 1B of the fan casing 1, it is provided in many stages. Due to the existence of the formed gaps S, S, S..., The leakage pressure is successively reduced, and finally the bell mouth 4 and the fan casing 1 are sealed freely by a slight air leak. The

As described above, according to this centrifugal blower, the bell mouth 4 and the fan member 2 are integrated, and the bell mouth 4 and the fan casing 1 are connected in a non-contact manner through the non-contact seal structure 5. As a result, air leakage between the bell mouth 4 and the fan casing 1 can be eliminated as much as possible, and dimensional control can be performed very easily. Further, the non-contact type seal structure 5 is a labyrinth seal structure 6, and the labyrinth is formed on the peripheral edge part 1E of the suction port 1B of the fan casing 1 and the peripheral edge part 4D of the other end opening 4C of the bell mouth 4 which are flat parts. Since the first ring-shaped member 7 and the second ring-shaped member 8 constituting the structure are provided, relatively high sealing efficiency can be obtained. That is, the significant leakage of air and the circulation in the casing can be further reduced, and the fan efficiency can be improved. In addition, since the first ring-shaped member 7 and the second ring-shaped member 8 are made of synthetic resin, even if the rotating first ring-shaped member 7 comes into contact with the second ring-shaped member 8, a spark is large. There is no noise or impact, and relatively little wear is required.

Embodiment 2. FIG.
In Embodiment 1, although an example of the labyrinth seal structure 6 is illustrated as a non-contact seal structure, Embodiment 2 which showed the various modification of a non-contact seal structure is demonstrated next.
Variations of these non-contact seal structures are shown in FIGS. 5 (a) to 5 (g).
First, the non-contact seal structure 5a of FIG. 5A shows a labyrinth seal structure 6a in which the shapes of the first ring-shaped member and the second ring-shaped member are different from those shown in the first embodiment. That is, in the labyrinth seal structure 6a, two first ring-shaped

members

7a, 7a are provided on the peripheral edge 4D of the bell mouth 4, and two second ring-shaped members are provided on the peripheral edge 1E of the top plate 1A of the fan casing. 8a and 8a are provided. Each of the first ring-shaped member 7a and the second ring-shaped member 8a is formed in a triangular cross section that tapers toward the opposing surface. These first ring-shaped member 7a and second ring-shaped member 8a are also sealed by the presence of zigzag gaps S, S, S,.
In the labyrinth seal structure 6a, the introduction plate portion 2A of the fan member 2 is integrally connected to the peripheral portion 4B of the bell mouth 4. Similarly, in the non-contact seal structures 5b to 5f shown in FIGS. 5B to 5G described later, the introduction plate portion 2A of the fan member 2 is integrally formed with the peripheral portion 4B of the bell mouth 4. It is connected. Although illustration is omitted, the numbers of the first ring-shaped member 7a and the second ring-shaped member 8a are set in consideration of the cost, the leakage amount, etc., and are not limited to the first and second items.

And in the non-contact seal structure 5b of FIG.5 (b), the 2nd ring-shaped member 8b which faces the front-end | tip of the peripheral part 4D of the bellmouth 4 non-contactingly on the upper surface of the top plate 1A in the fan casing 1 is contacted. However, it is provided over the perimeter of the suction inlet 1B. 5C, the top surface of the top plate 1A of the fan casing 1 faces the top surface of the peripheral portion 4D of the bell mouth 4 in a non-contact manner in the radial direction and the cylinder center C direction. A ring step plate member 12 is provided over the entire circumference of the suction port 1B. The ring step plate member 12 is formed in a step shape in a side sectional view. The subsequent non-contact seal structure 5d in FIG. 5 (d) has a ring step plate member 12a in which the rising plate portion is inclined with respect to the cylindrical center C direction as compared with the ring step plate member 12 in FIG. 5 (c). It is used.

Next, in the non-contact seal structure 5e of FIG. 5 (e), the second ring-shaped member 8c is provided over the entire circumference of the suction port 1B on the inner peripheral surface of the ring step plate member 12a shown in FIG. 5 (d). It has been. The non-contact seal structure 5f shown in FIG. 5 (f) has a peripheral drooping portion 4Da which is further bent downward after the peripheral edge portion 4D of the bell mouth 4 extends to the outside in the radial direction of the top plate 1A of the fan casing 1. It has.
With the non-contact seal structures 5a to 5f described above, air leakage from the bell mouth 4 and the fan casing 1 can be eliminated as much as possible, dimensional control can be performed very easily, and fan efficiency can be improved. Can be improved.

Embodiment 3 FIG.
In the first and second embodiments, the fan member and the bell mouth are integrated and the bell mouth and the fan casing are connected via the non-contact seal structure. Next, the fan member, the bell mouth and the fan casing are connected. A third embodiment in which the integrated fan casing and the air conditioning unit casing having a different structure are connected via a non-contact seal structure will be described.
As shown in FIG. 6, the centrifugal blower according to the third embodiment has a cylindrical air conditioner having a unit suction port 10 B on the top plate 10 A that is one side surface and a unit outlet 10 D on the bottom plate 10 C that is the other side surface. It is arranged in the unit casing 10. As shown in FIG. 7, the centrifugal blower includes a fan casing 1a formed in a cylindrical shape, a fan member 2 disposed in the fan casing 1a, a motor 3 that rotationally drives the fan member 2, A bell mouth 4 provided between the fan casing 1a and the fan member 2 is provided. The fan casing 1 has a top plate 1A at one end side surface and a bottom plate 1C having an air outlet 1D at the other side surface.

Since the fan member 2 and the motor 3 have the same structure as that shown in FIGS. 1 and 2 in the first embodiment, detailed description thereof is omitted here. The bell mouth 4 has substantially the same shape as that shown in the first embodiment. And the peripheral part 4B of the one end opening 4A of the bell mouth 4 is integrally connected to the upper surface of the introduction plate part 2A of the fan member 2 over the entire circumference.
Further, the peripheral edge 4D of the other end opening 4C of the bell mouth 4 and the peripheral edge 1E of the top plate 1A of the fan casing 1a are integrally connected over the entire periphery. That is, the integrated fan unit 9 is configured by integrating the fan member 2, the bell mouth 4 and the fan casing 1a. And in the centrifugal blower of this Embodiment 3, the peripheral part 1E of the blower outlet 1D of the fan casing 1a in the integrated fan unit 9 and the bottom plate 10C of the peripheral part 10E of the unit blower outlet 10D of the air-conditioning unit casing 10 are not. The contact seal structure 5 is connected in a non-contact manner.

As the non-contact type seal structure 5, for example, a labyrinth seal structure 6b is employed. In the labyrinth seal structure 6b, as shown in FIG. 7, one first ring-shaped member 7 and one second ring-shaped member 8 face each other through the gaps S and S without contact. ing. The 1st ring-shaped member 7 is provided in the opposing surface 1F with the air-conditioning unit casing 10 in the peripheral part 1C of the blower outlet 1D of the fan casing 1a over the perimeter. The 2nd ring-shaped member 8 is provided over the perimeter surface 10F with the bottom plate 1C of the fan casing 1a in the peripheral part 10E of the unit blower outlet 10D of the air conditioning unit casing 10 over the perimeter. The 1st ring-shaped member 7 and the 2nd ring-shaped member 8 which comprise this labyrinth seal structure 6b are comprised, for example with the synthetic resin.

As described above, according to the centrifugal blower of the third embodiment, the integrated fan unit 9 is provided in the air conditioning unit casing 10, and the peripheral portion 1E of the air outlet 1D of the fan casing 1a and the unit of the air conditioning unit casing 10 are provided. Since a structure in which the peripheral edge portion 10E of the air outlet 10D is connected in a non-contact manner through a labyrinth seal structure 6 that is a non-contact seal structure 5, air from between the fan casing 1a and the air conditioning unit casing 10 is used. Leakage can be eliminated as much as possible, and dimensional control can be performed very easily. Moreover, since the labyrinth seal structure 6b is applied, a significant air leakage can be further reduced and the fan efficiency can be improved.

In each of the above-described embodiments, the example in which the first ring-shaped member and the second ring-shaped member constituting the labyrinth seal structure are made of synthetic resin is shown, but the present invention is not limited thereto. For example, you may comprise a 1st ring-shaped member and a 2nd ring-shaped member with heat insulating materials, such as a polyurethane foam. In the case of using such a heat insulating material, noise and impact during driving can be further reduced.

1,1a Fan casing 1A Top plate (one side)
1B Suction port 1C Bottom plate (the other side)
1D Air outlet 1E Peripheral portion 1F Opposing surface 2 Fan member 2A Introducing plate portion 2B Back plate portion 2C Blade plate portion 2D Air introducing hole 2E Fan air outlet 3 Motor 3A Rotation drive shaft 4 Bell mouth 4A One end opening 4B Peripheral portion 4C The other end Opening 4D Perimeter 4E Opposing surfaces 5 to 5g

Non-contact seal structure

6, 6a, 6b

Labyrinth seal structure

7, 7a

First ring member

8, 8a, 8b, 8c Second ring member 9 Integrated fan unit 10 Air conditioning unit Casing 10A Top plate (on one side)
10B Unit inlet 10C Bottom plate (the other side)
10D Unit outlet 10E Peripheral part 10F Opposing surface 11 Heat exchanger C Tube center R Arrow S Clearance

Claims

A fan casing having a suction port on one side surface and a blower outlet on the other side surface, a fan member arranged in the fan casing and rotating in the fan casing, and connected to the fan member to A rotationally driven motor, and a bell mouth disposed between the fan casing inlet and the fan member,
The fan member connected the disc-shaped introduction plate portion having an air introduction hole, the disc-shaped back plate portion arranged to face the introduction plate portion, and the introduction plate portion and the back plate portion. A plurality of blades provided in the circumferential direction,
The peripheral portion of the one end opening of the bell mouth is integrally connected to the introduction plate portion of the fan member over the entire circumference,
A centrifugal blower characterized in that a peripheral edge portion of the other end opening of the bell mouth and a peripheral edge portion of the suction opening of the fan casing are connected in a non-contact manner through a non-contact seal structure.
A non-contact type seal structure is provided with a first ring-shaped member provided over the entire periphery of the peripheral surface of the bell mouth at the other end opening of the bell mouth, and the bell mouth at the peripheral portion of the suction opening of the fan casing. 2. The centrifugal blower according to claim 1, wherein a labyrinth seal structure is formed such that a second ring-like member provided on the entire surface opposite to the surface faces a gap in a non-contact manner.
A cylindrical fan casing having a suction port on one side surface and a blowout port on the other side surface, a fan member arranged in the fan casing and rotating in the fan casing, and connected to the fan member, A motor that rotationally drives the fan member, and a bell mouth arranged between the suction port of the fan casing and the fan member,
The fan member connected the disc-shaped introduction plate portion having an air introduction hole, the disc-shaped back plate portion arranged to face the introduction plate portion, and the introduction plate portion and the back plate portion. A plurality of blades provided in the circumferential direction,
The peripheral part of the one end opening of the bell mouth is integrally connected to the introduction plate part of the fan member over the entire periphery, and the peripheral part of the other end opening of the bell mouth and the peripheral part of the suction port of the fan casing are Connected all around,
In the air conditioning unit casing having a unit suction port on one side surface and a unit outlet on the other side surface, the integrally formed fan member, the bell mouth and the fan casing are arranged,
A centrifugal blower characterized in that a peripheral edge portion of the air outlet of the fan casing and a peripheral edge portion of the air outlet unit casing are connected in a non-contact manner through a non-contact seal structure.
A non-contact type seal structure is provided with a first ring-shaped member provided over the entire periphery of the peripheral surface of the air outlet unit outlet of the fan casing and the peripheral portion of the air outlet unit casing of the air outlet unit casing. The centrifugal blower according to claim 3, wherein a labyrinth seal structure is provided in which the second ring-shaped member provided on the entire surface facing the fan casing faces through a gap in a non-contact manner.
The centrifugal blower according to claim 2 or 4, wherein the first ring-shaped member and the second ring-shaped member constituting the labyrinth seal structure are composed of a synthetic resin or a heat insulating material.