WO2003031825A1

WO2003031825A1 - Multi-stage centrifugal fan

Info

Publication number: WO2003031825A1
Application number: PCT/JP2002/010147
Authority: WO
Inventors: Toshirou Kisakibaru
Original assignee: Kondoh Industries, Ltd.; Cambridge Filter Japan, Ltd.
Priority date: 2001-10-01
Filing date: 2002-09-30
Publication date: 2003-04-17
Also published as: TW562899B; JP2003106289A

Abstract

A multi-stage centrifugal fan capable of providing a high static pressure exhaust, comprising a plurality of rotors (19a) to (19c) and chambers (20a) to (20c), wherein the plurality of rotors (19a) to (19c) having the chambers (20a) to (20c) in order from the inside to the outside are connected to a fan case (4) having the rear stage chamber with a volume smaller than that of the front stage chamber coaxially with a rotor drive shaft (9), the plurality of rotors (19a) to (19c) are operated in association with the rotor drive shaft (9), and chamber partition walls are fixed to the fan case (4) in the chambers (20a) to (20c) between the plurality of rotors (19a) to (19c).

Description

,

Specification

Technical field of multi-stage centrifugal fan

The present invention relates to a multi-stage centrifugal fan that is small in size, has low noise, and provides high static pressure exhaust. Background art

Conventionally, various unit-type air purifiers have been used in homes and offices. This is intended to save energy by using a partial air purifier to deal with partial dust, as typified by an air purifier for removing smoke from cigarettes.

In semiconductor manufacturing lines, medical care, food manufacturing, and other fields, clean rooms have been set up to keep large spaces clean and aseptic. However, as the technology in each field has advanced, a clean and sterile environment has been required more than ever, and local clean and sterile environment space is required as a method to respond to such demands. It has become. The application of this technology has not only facilitated the realization of a clean and sterile environment space of extremely high quality locally, but also achieved significant energy savings. There are various concepts and methods of equipment and facilities depending on the application, and a unit-type air purifier is one of them.

However, it cannot be said that the above-mentioned local cleaning devices and equipment are still sufficiently satisfactory in performance. The cause is the lack of performance of the fan. The following is an example of a unit type air purifier.

That is, the cause of the insufficient performance of the conventional various unit-type air purifiers is insufficient performance of the built-in fan. Conventionally, centrifugal fans have been adopted for fans used in air purifiers due to demands for low noise and low cost, but due to their structure, high static pressure exhaust cannot be obtained. There was a problem that. In addition, various filters installed in conventional air purifiers to remove dust, smoke, and other substances in the air have large pressure loss, and conventional centrifugal fans can achieve high discharge mm. There was a problem that dust, smoke, and others could not be removed sufficiently. ₀

On the other hand, there is an axial fan among the fans that can obtain high exhaust air, but there is a problem that the noise is loud, the size is large, the price is high, and it is not suitable for an air purifier fan.

The present invention has been made to solve the above-mentioned problems, and can provide a small, low-noise, and high static pressure exhaust, and particularly, in a semiconductor manufacturing line, medical care, food manufacturing, and other fields, only necessary parts are provided. This is a multi-stage centrifugal fan that is optimal for use in local clean equipment that achieves a clean and sterile environment. Disclosure of the invention

The present invention relates to a multistage centrifugal fan comprising a plurality of ports and a chamber, wherein the rear chamber has a capacity less than that of the front chamber, and the plurality of ports are connected to a fan case. The plurality of ports are coaxially connected to the overnight drive shaft from inside to outside with a chamber, and the plurality of ports cooperate with the lowway drive shaft; The above problem was solved by adopting a means in which the partition wall of the chamber is fixed to the fan case. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a vertical sectional view of a multi-stage centrifugal fan according to a first embodiment of the present invention. FIG. 2 is a plan view showing a cutaway part of the multi-stage centrifugal fan according to the first embodiment of the present invention shown in FIG.

FIG. 3 is a perspective view of a main part of a partition wall constituting the multistage centrifugal fan according to the first embodiment of the present invention shown in FIG.

FIG. 4 is a plan view of a main part of a partition wall constituting the multi-stage centrifugal fan according to the first embodiment of the present invention shown in FIG.

FIG. 5 is a sectional view of a main part of a partition wall constituting the multistage centrifugal fan according to the first embodiment of the present invention shown in FIG.

FIG. 6 is a graph showing a state where air is pressurized inside the multistage centrifugal fan according to the first embodiment of the present invention.

FIG. 7 shows another embodiment of the partition wall constituting the multistage centrifugal fan according to the present invention. It is a perspective view of the principal part.

FIG. 8 is a plan view of a main part showing another embodiment of the partition wall constituting the multistage centrifugal fan according to the present invention shown in FIG.

FIG. 9 is a sectional view of a main part showing another embodiment of the partition wall constituting the multistage centrifugal fan according to the present invention shown in FIG.

FIG. 10 is a perspective view showing still another embodiment of the main part of the partition wall constituting the multistage centrifugal fan according to the present invention.

FIG. 11 is a plan view showing still another embodiment of the main part of the partition wall constituting the multistage centrifugal fan according to the present invention shown in FIG.

FIG. 12 is a cross-sectional view showing still another embodiment of the main part of the partition wall constituting the multistage centrifugal fan according to the present invention shown in FIG.

FIG. 13 is a partially omitted cross-sectional view showing a multi-stage centrifugal fan according to a second embodiment of the present invention.

FIG. 14 is a partially omitted cross-sectional view showing a multi-stage centrifugal fan according to a third embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of a multistage centrifugal fan according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, and FIG. 2 is a plan view showing the same part cut away. The multistage centrifugal fan according to the present invention is installed in a fan case 4 formed by opening an air intake port 1 at an upper portion and opening an exhaust port 3 at an appropriate position on a peripheral wall 2.

In the fan case 4, the horizontal planes 5a, 5b, and 5c and the inclined planes 6a and 6b are connected in a plurality of steps so that the ventilation port 1 is higher and goes toward the peripheral wall 2 and becomes lower. In the configuration of FIG. 1, the horizontal plane is provided over the first horizontal plane 5 a, the second horizontal plane 5 b, the third horizontal plane 5 c, and three steps, In addition, the first inclined surface 6a and the second inclined surface 6b are provided in two steps. A mouth drive shaft 9 is passed through a bearing 8 provided at the center of the bottom plate 7 of the fan case 4, and a lower portion of the rotor drive shaft 9 is driven by a drive motor 10 as a drive source. —Connected to the evening drive shaft 11, and the mouth drive shaft 9 is rotated by the drive motor 10.

The drive motor 10 is provided with a drive motor outlet 12 around the outer periphery of the base of the motor drive shaft 11 and has an interval outside the drive motor drive 12. The drive module 13 is formed so as to face the inner peripheral wall surface of the housing 14 closed on the lower surface of the bottom plate 7 of the fan case 4 so as to face each other.

The drive motor 10 is connected to a motor power supply 16 including a main rotation speed setting variable resistor 15 capable of freely setting the rotation speed.

A cylindrical blade holder 18a erected on the outer periphery of the disk-shaped rotating plate 17a is formed below the first horizontal surface 5a in the fan case 4. The first stage opening 19a is fixedly connected to the center of the disk-shaped rotating plate 17a above the rotor drive shaft 9, and is provided below the second stage horizontal surface 5b. A second-stage rotor 19 b formed so that a cylindrical blade holder 18 b erected on the outer peripheral edge of 17 b is positioned at the center of the disk-shaped rotating plate 17 b. A cylindrical blade holder 18, which is fixedly connected to the intermediate portion of the rotor drive shaft 9, and is provided below the third horizontal surface 5 c on the outer peripheral edge of the disk-shaped rotary plate 17 c. A third-stage rotor 19c formed so as to position c is fixedly connected to the center of the disk-shaped rotating plate 17c below the opening-and-closing drive shaft 9. There. As a result, the rotors 19 a to 19 c rotate together with the rotor drive shaft 9 due to the rotation of the rotor drive shaft 9.

The first-stage chamber 20a is arranged between the first-stage opening 19a and the second-stage opening 19b, and the second-stage rotor 19b and the third-stage rotor 19c. Then, a second-stage chamber 2 Ob is formed, and a third-stage chamber 120c is formed between the 3'-stage rotor 19c and the peripheral wall 2. Due to the shape of the fan case 4, the volume of each of the chambers 20a to 20c is such that the volume of the rear chamber is less than or equal to the volume of the front chamber.

Standing on the outer peripheral edge of the disc-shaped substrate 21a, on the lower surface of the first-stage inclined surface 6a between the first-stage opening 19a and the second-stage low 19b constituting the first-stage chamber 20a. The upper end surface of the cylindrical first-stage chamber-partition wall 2 2a is fixed, and the disc-shaped substrate 2 1 _g

The center of a is connected to the opening and closing drive shaft 9 and fixed to the first and second driving openings 9a and 19b. It is held via bearings 23a so as not to cooperate with 9.

In addition, a disc-shaped fiber 2 1 b is formed on the lower surface of the second-step inclined surface 6 b between the second-step low 19 b and the third-step mouth which constitutes the second-step chamber 1 O b. The upper end surface of the cylindrical second-stage champer-first partition 2 2 b erected on the outer peripheral edge of the disk-shaped substrate 2 lb is fixed to the center of the disc-shaped substrate 2 lb by being connected to the mouth-and-night drive shaft 9. In addition, the drive shaft 9 between the second stage low shaft 19b and the third stage mouth 19c is provided with a bearing 23b so as not to cooperate with the low stage drive shaft 9. Has been held.

That is, in the first embodiment of the present invention, for convenience of explanation, the fan case .4 is formed by alternately connecting three horizontal planes and two inclined planes alternately. In addition, the opening and closing walls are formed in three steps and the partition walls are formed in two steps. However, the multistage centrifugal fan of the present invention is not limited to this, and may be more. A plurality of horizontal planes and inclined planes are connected in series, and a plurality of mouths and chambers and partition walls are alternately coaxial with the mouth and drive shaft in a fan case formed so as to become thinner toward the outside. They are arranged in multiple stages from the inside to the outside in a circular shape.

Each of the blade holders 18 a to l 8 c protruding from the outer peripheral edge of each of the disk-shaped rotating plates 17 a to l 7 c constituting the above-mentioned mouths 19 a to l 9 c are annular. A number of blades 26 are provided between the upper and lower fixing plates 24 225, and ventilation openings 27 are provided between the respective blades 26, and are formed to be erected at a predetermined angle. ing. Each of the blade holders 18a to 18c is placed and fixed on the outer peripheral edge of each of the disk-shaped rotary plates 17a to 17c, and each of the blades 19a to 18c is fixed. 9 c is formed.

As shown in FIGS. 1 to 5, each of the champer partition walls 22 a to 22 b protruding from the outer peripheral edge of each of the disc-shaped substrates 21 a to 21 b has an annular upper and lower fixing plate. Between 28 and 29, a number of airflow direction changing blades 30 are provided between the respective blades 30 and provided with ventilation openings 31 respectively, and are formed to be erected at a predetermined angle. . The partition walls 22a to 22b of the respective chambers are placed and fixed on the outer peripheral edges of the disk-shaped substrates 21a to 21b, respectively.

The operation of the multistage centrifugal fan according to the first aspect of the present invention will be described. _g

You. When the motor power supply 16 is turned on and power is supplied to the drive motor 10, the motor drive shaft 11 and the mouth drive shaft 9 connected thereto rotate, and the 19c to 19c also rotate together. The rotation speed of the drive mode 10 can be arbitrarily set by the main rotation speed setting variable resistor 15.

Due to the rotation of the ports 19 a to l 9 c, the air sucked in from the air inlet 1 comes into contact with the blades 26 of the rotating first row rotor 19 a to generate centrifugal force Π. The pressure is discharged to the first chamber 20a through the ventilation opening 27 between the blades 26. The air discharged into the first-stage chamber 20a is caused to flow by the airflow direction changing blades 30 provided in the first-stage chamber one partition 22a fixed to the fan case 4. Is converted into a radial airflow, and is discharged to the second stage opening 19 b through the ventilation 31 between the blades 30.

The air discharged to the second stage mouth 19b contacts the rotating blades 26 of the rotating second stage mouth 19b, and the centrifugal force is further increased. The air is discharged to the second chamber 1 Ob through the ventilation opening 27 between the blades 26. The air discharged into the second-stage chamber 2 Ob is supplied to the second-stage chamber partition wall 22 b fixed to the fan case 4 by airflow direction changing blades 30 provided in the second-stage chamber partition wall 22 b. The airflow direction is changed to a radial airflow, and the air is discharged to the third stage opening 19c through the ventilation openings 31 between the blades 30.

Each of the blades 26 serves to guide an air flow for converting the air flow of the air pressurized at the low end into a radial air flow and supplying the air flow to the rear opening.

The air discharged to the third stage opening 19 c contacts the blades 26 of the rotating third stage 19 c, and the centrifugal force is further increased. The air is discharged again through the ventilation opening 27 between the blades 26 and again into the third-stage chamber 210c, and then discharged from the exhaust port 3 to the outside as high-pressure exhaust.

That is, according to the multi-stage centrifugal fan according to the first embodiment of the present invention, the airflow opening 27 to which each of the blades 26 is attached reduces the circumferential component of exhaust gas from the first chamber to the second chamber. The direction is changed, and only the component exhaust and static pressure are exhausted to the second stage.

In addition, so that the mouth mouth blades at the later stage can efficiently catch the airflow from the former stage, The angle of each blade 26 forming the ventilation opening 27 is adjustable. The ventilation openings 27 fitted with the blades 26 minimize the pressure loss, increase the pressure efficiency of the rotor, and realize a highly efficient multistage centrifugal fan.

Also, when the air pressurized in the first port flows into the second chamber through the ventilation opening in the first chamber, to prevent the pressure from dropping due to the expansion of ■ in the second chamber. The volume of the rear chamber is smaller than the volume of the front chamber, and the distance between each chamber is short, so that pressure loss is small, high static pressure exhaust is obtained, and the size of the fan is small. Can be reduced in thickness. FIG. 6 shows a state in which, in the multistage centrifugal fan shown in the first embodiment of the present invention, the air sucked in from the intake port 1 of the centrifugal fan is subjected to the Caro pressure in each stage rotor. FIG. The horizontal axis of the graph indicates the radial direction of the centrifugal fan, and the vertical axis indicates the air pressure in each chamber. The shaded area in the graph is the area where air is pressurized by each rotor. The dotted line in the graph indicates the large ^ E, and P-20a, P-20b, and P-20c indicate the pressure in the chamber 20a-20c, respectively. In other words, as shown in Fig. 3, as the air sucked in from the intake port 1 passes through the first stage row 19a to the second row 19b from the first row 19a, You can see the situation where pressure is applied.

7 to 9 are a perspective view, a plan view, and a cross-sectional view showing another embodiment of the chamber-partition walls 22a to 22b. The chamber-partition walls 22 a to 22 b shown in FIGS. 1 to 5 are formed with a large number of blades 30. The chamber partition walls 22 a to 22 shown in FIGS. 7 to 9 are formed. b is formed with a porous strip 33 having a number of holes 32 between the annular upper and lower fixing plates 28 and 29, and having a thickness approximately equal to the diameter of the holes 32. Has been done. By using the porous strip 33, the circumferential component of the airflow of the exhaust gas from the first chamber to the second chamber is changed to the radial component of the rotor, and the pressurized exhaust radial component is exhausted. This airflow flows into the rear chamber, and the blades at the rear stage can capture the airflow efficiently. The chamber partition is easier to manufacture than the chamber partition shown in FIGS. 1 to 5 and can reduce the cost.

FIGS. 10 to 12 show still another embodiment of the chamber-to-partition walls 22 a to 22 b. It is the perspective view, top view, and sectional drawing which show a state. The chamber partition walls 22 a to 22 b shown in FIGS. 10 to 12 are formed with a thick net-like body 34 between the annular upper and lower fixing plates 28 and 29. I have. By forming the net-like body 34, the circumferential component of the airflow of the exhaust gas from the first chamber to the second chamber is eliminated, and the exhaust gas becomes the radial component and flows into the second chamber. Further, this chamber-partition wall is easier to manufacture than the chamber-partition walls shown in FIGS. 1 to 5, and cost can be reduced.

FIG. 13 is a partially cutaway sectional view showing the second embodiment of the present invention. In the multi-stage centrifugal fan in Fig. 13, the blade holders 18 a to l 8 c of the mouth 19 a to l 9 c at each stage are fixed to the upper part of the mouth drive shaft 11. It is fixed to one disk-shaped rotating plate 35 in three steps in a stepwise manner, and the first-stage chamber 20a, two-stage between the above-mentioned mouths 19a to 19c, respectively. An eye chamfer 20b is formed. The first-stage and second-stage blade holders 18a and 18b are disk-shaped substrates 3 each having the first-stage and second-stage chamber one partition walls 22a ■ 22b projecting from the outer peripheral edge, respectively. 6a36b on the lower part of the blade holder 18a18b, the blade holder

To support with the bearings 37a and 37b so that they do not cooperate with the 18a and 18b, a concave portion is provided at the lower part of the blade holder 18a and 18b. 8b is formed ο

In the multistage centrifugal fan according to the second embodiment of the present invention, the mouth of each stage is not individually connected and fixed to the mouth drive shaft 9, but the mouth of each stage 19 a ~

Since the 19 c blade holders 18 a to 18 c are fixed to a single disk-shaped rotating plate 35, the thickness of the fan can be reduced, and a small size fan can be formed. The number of parts can be reduced, and costs can be reduced. The other operations are the same as those of the first embodiment, and the description is omitted.

FIG. 14 is a partially cutaway sectional view showing the third embodiment of the present invention. The multi-stage centrifugal fan in Fig. 14 has a coaxial cylindrical shape with each of the drive shafts 9 a to 9 c so that the mouths 19 a to l 9 c of each stage can be fixed individually. Separately installed, the drive motors 10a to 10c connected to the individual drive shafts 9a to 9c, the rotation speed of each of the ports 19a to l9c Can be set for each mouth 1 9 a ~ l 9 c _g

It is something that has been done.

In other words, as shown in Fig. 14, the first row of rows 19a, the second row of rows 19b, and the third row of ports 19c are each the first row of ports arranged in a coaxial cylindrical shape. It is connected and fixed to the overnight drive shaft 9a, the second stage rotor drive shaft 9b, and the third stage mouth overnight drive vehicle 9c. The first-stage rotor drive shaft 9a, the second-stage rotor drive shaft 9b and the third-stage rotor drive shaft 9c are respectively a first-stage drive motor 10a, a second-stage drive motor 10b and 3 The first stage motor drive shaft 1c is connected to the first stage motor drive shaft 1 la, the second stage motor drive shaft 1lb, and the third stage motor drive shaft 11c.

Each of the driving modes 10a to L0c is connected to a power supply 16a to 16c, respectively, a first stage main rotation speed setting variable resistor 15a, and a second stage main rotation speed setting variable resistor. 15b and 3rd-stage main-rotational-speed setting variable resistor 15c provide the 2nd-stage self-rotor 19b and 2 for the 1st-stage opening 19a rotation speed and 1st-stage rotor 19a. The rotation speed ratio of the third stage opening 19c to the first stage rotor 19b can be set.

In the multistage centrifugal fan according to the third embodiment of the present invention, each port is connected to an individual drive mode, the exhaust from the first chamber is minimized in pressure loss, and the second chamber is In order to be able to pass over the entire mouth, each mouth can be set freely with the master's mouth and the rotation speed ratio between the other mouths, and the efficiency of the entire fan is set optimally The fan output can be adjusted while maintaining the rotation speed ratio for each mouth. The other operations are the same as those of the first embodiment, and the description is omitted.

According to the present invention, as described above, a plurality of ports are provided in the fan case in which the volume of the rear chamber is less than or equal to the volume of the front chamber. In the chamber between the plurality of rotors, since the chamber-partition is provided, the distance between the chambers in each stage is short, and as a result, pressure loss is small, high static pressure exhaust is obtained, and the size and the size are low. The noise and the thickness of the fan can be reduced. In addition, it is a multi-stage centrifugal fan that is most suitable for use in local clean equipment that realizes a partially clean and aseptic environment in only necessary locations in semiconductor manufacturing lines, medical care, food manufacturing, and other fields.

Claims

WO 03/031825 χ () PCT / JP02 / 10147 Scope of request

1. A multi-stage centrifugal fan composed of a plurality of ports and a chamber, and a plurality of ports are connected to a fan case in which the volume of the rear chamber is less than the volume of the front chamber. A plurality of chambers are connected to the drive shaft in a coaxial circular shape from the inside to the outside from the inside to the outside, and the plurality of rovers cooperate with the roaster drive shafts; A multi-stage centrifugal fan according to claim 1, wherein the chamber and the partition are fixed to a fan case.

2. A multi-stage centrifugal fan consisting of a plurality of ports and a chamber, wherein the volume of the rear chamber is less than the volume of the front chamber, and the multiple ports are connected to the fan case. One disk-shaped rotary plate cooperating with the overnight drive shaft is connected from the inside to the outside with a chamber, and in the plurality of chambers, the chamber partition is a fan. Multistage centrifugal fan fixed to the case.

3. A multi-stage centrifugal fan composed of a plurality of roasters and a chamber, and a fan case in which the volume of the rear chamber is equal to or less than the volume of the front chamber; Each of the ports is connected to the drive shaft of each port from the inside to the outside with a chamber, and each of the ports is a row and the other, and the number of rotations of each of the other ports is one. A multi-stage centrifugal fan characterized in that the ratio can be set, and a chamber and a partition are fixed to a fan case in a plurality of chambers at one time.

4. The multistage centrifugal fan according to any one of claims 1 to 3, wherein the chamber and one partition wall are provided with a large number of blades and ventilation openings.

5. The multistage centrifugal fan according to any one of claims 1 to 3, wherein the chamber / partition wall is a porous band having a large number of holes and having a thickness substantially equal to the diameter of the holes. .

6. The multi-stage centrifugal fan according to any one of claims 1 to 3, wherein the chamber-partition wall is a thick net-like body.

7. In claim 4, a plurality of blades are circumferentially mounted on the channel wall of the channel, and from the first chamber to the second chamber through the ventilation openings mounted on the blade. The multi-stage remote J fan characterized in that the circumferential component of the exhaust to the — is turned to the radial component of the mouth and only the radial component exhaust and static pressure are exhausted to the downstream chamber.