JP3058763B2 - Blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower used as a blower of, for example, an air conditioner or an air cleaner.

[0002]

2. Description of the Related Art A blower 100 using a sirocco fan (multi-blade blower having forward wings) as shown in FIG. 6 has been known as a blower used for air conditioning equipment such as air conditioning equipment and a clean room. I have. Conventional blower 100
A scroll casing 102, a sirocco fan 103, and a fan 103 inside an outer casing 101 made of a steel plate.
It has a built-in motor 105 for rotating the scroll casing.
Air is discharged from the discharge port 106 of the outer casing 101 through the discharge port 106. Outer casing 101
A desired downstream device 111 such as a filter or a heat exchanger is provided on the side of the outlet 110.

In the blower 100, downstream equipment
It is desirable to make the airflow distribution through 111 as uniform as possible. Also, for the purpose of reducing noise, blower
Countermeasures such as installing a silencer around 100 may be taken. In recent years, a closed-cell porous body is sometimes used as a casing component for the purpose of weight reduction and cost reduction.

[0004]

The blower 100 using the above-described conventional sirocco fan 103 has a downstream device 111.
In order to prevent the local concentration of air flow from occurring, it is necessary to send the wind to the downstream equipment 111 as evenly as possible by providing the fan 103 at a position that is considerably offset from the center of the outer casing 101. There is. For this reason, not only does the weight balance of the blower 100 deteriorate, but also there is a limit in making the airflow distribution uniform at one discharge port 106.

However, in the case of the sirocco fan 103, if a plurality of discharge ports 106 are provided, the scroll length for each discharge port 106 is shortened. Since no recovery can be obtained, the air volume and the static pressure are extremely reduced, and high efficiency cannot be achieved.

In addition to the conventional device 100,
The conventional air blower generates a large amount of noise, and requires a large amount of soundproofing material to suppress the noise to a certain level or less. This causes a large-sized device and a large weight. In addition, if it is necessary to provide a blower at the ceiling to make effective use of the floor space, it is desirable to reduce the weight and thickness of the blower. This causes problems such as an extremely uneven airflow distribution and an increase in noise. In particular, in the case of a sirocco fan, since a plurality of discharge ports cannot be provided for the above-described reason, it is difficult to reduce the weight and thickness of the blower. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a blower that is small, has high efficiency, has low noise, has a nearly uniform airflow distribution, and can exhibit stable performance.

[0007]

SUMMARY OF THE INVENTION The present invention, which has been developed to achieve the above object, has an air blower having an outer casing having a chamber therein, and a fan unit which is built in the outer casing and blows air into the chamber. An apparatus, wherein the fan unit includes a turbo fan having a swept wing, a scroll casing that houses the turbo fan, and a motor that rotates the turbo fan, and the scroll casing is a scroll made of a sound absorbing material. A scroll portion accommodating the turbofan, the first scroll member being located at a point 180 ° symmetrical with respect to the rotation axis of the turbofan. And the second discharge port are provided , and the outer casing is provided .
The fan unit is placed on the
The casing includes a first chamber and a second chamber.
And a partition member for partitioning the
The first discharge port is opened in one chamber and the second discharge port is opened.
The second discharge port is opened in the chamber, and both chambers are opened.
A downstream device is provided over the air outlet of the bag .

[0008]

When the turbo fan rotates, the air sucked into the fan passes through the scroll portion due to the centrifugal force and is equally divided into a plurality of discharge ports, so that the first air and the first air in the outer casing are separated.
And into the second chamber. Air blown into these chambers is filtered by a filter or heat exchanger located downstream.
This downstream side merges with the desired downstream equipment such as a vessel.
Guided outside through the device . The scroll portion is formed on a scroll body made of a sound absorbing material, and the outside of the scroll body is covered with an outer plate, so that fluid noise generated by the fan and the casing, vibration by the fan and the motor, and member resonance are also suppressed. You. Outer case
The first and second chambers in the compartment separate from each other
Is separated by a
The generated air flow does not collide with each other and
The air is discharged from the air outlet toward the downstream equipment,
It is guided outside while merging again at the side device.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. The blower 10 shown in FIG. 1 has a two-way discharge fan unit 12 housed inside a metal outer casing 11. Outer casing 1
1 is a side plate 15 surrounding four sides and a top plate 1 located on the upper surface side.
6, and the top plate 16 is provided with a rectangular opening 17.

As shown in FIG. 2, an outlet 18 is opened on the lower surface side of the outer casing 11. A downstream device 19 such as a filter is provided near the outlet 18. The downstream device 19 is appropriately selected according to the application of the blower 10, and for example, an air filter for an air purifying device, a heat exchanger for an air conditioner, and the like are provided.

The fan unit 12 of this embodiment comprises a scroll casing 30, a turbo fan 31, a motor 32 for rotating the turbo fan 31, and a motor 3
2 and a suction inlet member 34 provided at the air intake port. The base 33 is fixed to a horizontal member 37 extending in the horizontal direction. An end of the horizontal member 37 is fixed to a fixing part 38 such as a bolt.
1 (shown in FIG. 1).

The turbo fan 31 has a plurality of retreating blades 40 arranged at a constant pitch in the circumferential direction.
The blade 40 is made of a mold material such as an aluminum alloy. As shown in FIG. 1, the cross section of the blade 40 has an aerofoil shape, and rotates in a direction indicated by an arrow F (counterclockwise) in FIG.

The scroll casing 30 includes an upper plate 45.
Outer plate 50 made of metal, lower plate 46 and side plate 47
And a scroll body 51 made of a sound absorbing material housed inside the outer plate 50. The scroll body 51 is made of an independent foamed porous body made of a synthetic resin such as styrene foam or urethane foam.

A scroll part 52 is formed inside the scroll body 51. The scroll part 52 includes a substantially circular air guide path 55 in which the turbo fan 31 is housed, and a first pressure recovery chamber 56 extending in a tangential direction of the wind guide path 55.
And the second pressure recovery chamber 57 and the first pressure recovery chamber 56
, A second discharge port 62 connected to the second pressure recovery chamber 57, and the like. The first pressure recovery chamber 56 and the second pressure recovery chamber 57 are formed so as to be 180 ° point-symmetric about the fan rotation shaft 41.

The first discharge port 61 is provided with a scroll body 51.
The second discharge port 62 is open at the other end of the scroll body 51. First outlet 6
The first and second discharge ports 62 are provided at 180 ° point symmetric positions with respect to the fan rotation shaft 41. The air guide path 55 and the pressure recovery chamber 5 inside the discharge ports 61 and 62
Arc-shaped cut-off portions 63 and 64 for cutting off the discharge flow are provided at corners where 6 and 57 intersect.

In FIG. 4, when a diameter of a drawing basic circle serving as a reference of the scroll portion 52 is φd, a θ angle which is a reference point of R 1 and R 2 which are curvatures of the scroll portion 52, and a cutoff with respect to a center axis m of the casing 30. Angle representing the position of the parts 63, 64, P dimension defining the minimum clearance between the fan and the cut-off parts 63, 64, outlet direction angle γ of the discharge ports 61, 62, longitudinal dimension L1 of the casing 30 and width direction The dimension L2 and the like are set as described below.

The outlet direction angle γ is determined by the discharge ports 61 and 62
Is the angle formed by the center line M of the discharge direction, which represents the position of. Discharge ports 61, 6 shown in FIG.
The second opening edges 65 and 66 are formed in an arc shape,
The outlet direction angle γ is represented by an angle between a line segment M connecting the centers of the discharge ports 61 and 62 and the fan rotation shaft 41 and the center axis m of the casing 30. The diameter φd of the base circle is

[0018]

(Equation 1)

The divergence angle α is a value that indicates an increase in the radial direction of the scroll portion 52, and is limited to a range of 7 ° ≦ α ≦ 8 ° here. The base circle division angle θ is set to 45 ° because the expansion radius is constant. The cut-off angle β of the cut-off portions 63 and 64 is 24 ° ≦ β ≦ 27 °, and the cut-off distance P is in the range of 0.5D ≦ P ≦ 0.6D. The radii of curvature R1 and R2 of the scroll section 52 are calculated by the following equations (2) and (3).

[0020]

(Equation 2)

[0021]

(Equation 3)

The exit direction angle γ is in the range of 14 ° ≦ γ ≦ 17 °. The longitudinal dimension L1 is 2.1D ≦ L1 ≦ 2.2
D, and the dimension L2 in the width direction is in the range of 1.4D ≦ L2 ≦ 1.5D.

A coating layer 70 hardened by an epoxy resin coating is applied to the inner surface of the scroll body 51, that is, the inner wall of the air guide passage 55 and the pressure recovery chambers 56 and 57, which serve as air flow boundary surfaces. This coating layer 70
May be obtained by coating a room temperature curing type liquid rubber-like elastic material instead of the epoxy resin.

By providing the coating layer 70, the foam constituting the scroll body 51 is prevented from being scattered at the airflow boundary surface, and the chemical resistance is improved. When the coating layer 70 is a film having elasticity such as an elastomer, a vibration damping effect can be exhibited.
The foam is desirably a closed cell, and also exhibits a function as a heat insulating material and a function as a sound absorbing / vibrating material.

One example of the method of forming the coating layer 70 is to harden the surface by applying an epoxy resin coating to the inner surface of a foam molded into a predetermined casing shape by foam molding. After applying the curable liquid rubber coating, the surface is left to elasticize. Alternatively, at the stage of molding the foam into a predetermined casing shape, a foamed resin material injection gate is formed so that a resin having excellent flowability, such as vinyl chloride, easily flows into the outer peripheral surface of the foam. By the heat of the two materials, the two materials are completely fused and two layers are formed, whereby the coating layer 70 is formed on the surface of the foam.

According to the study of the present inventors, when a closed-cell foam such as styrofoam is used for a scroll casing, a part of the foam at an airflow boundary surface such as a scroll portion may be formed depending on the composition and strength of the foam. It has been found that there is a case where it scatters or causes a practical problem in chemical resistance and heat resistance. On the other hand, in the scroll casing 30 having the coating layer 70 as in the present embodiment, since the airflow boundary surface is modified without impairing the excellent physical properties of the foam, the scroll casing 30 can be manufactured lightweight and inexpensively. Can,
Moreover, fluid noise generated by the casing 30 and the fan 31 and rotational vibration and member resonance caused by the fan 31 and the motor 32 can be significantly reduced.

Also, the coating layer 70 due to aging
There is no peeling, and the chemical resistance and heat resistance are also improved. In addition, since the outside of the scroll body 51 made of a foam is surrounded by the steel outer plate 50, an excellent sound insulation effect can be exhibited in combination with the use of the coating layer 70 described above.

The scroll casing 30 is supported on the outer casing 11 by a horizontal member 37.
The upper part of the scroll casing 30 is fixed to the outer casing 1 by fixing parts 71 such as bolts or rivets.
It is fixed to one top plate 16.

As shown in FIG. 2, the fan unit 1
A partition member 75 is provided on the lower surface side of 2. The partition member 75 extends in the horizontal direction so as to cross the outer casing 11, and the inside of the outer casing 11 is moved by the first chamber 7 on the left side in the drawing.
6 and a second chamber 77 on the right side in the figure. The partition member 75 is fixed to the base 3 by the fixing parts 78.
It is fixed to 3.

A pair of left and right side plates 1 of the outer casing 11
Rectifying members 80 are attached to the inner surface sides of the respective members 5. The rectifying member 80 is arranged so as to reverse the direction of the airflow discharged from the discharge ports 61 and 62 and to guide the airflow toward the blowout port 18. The rectifying member 80 includes a perforated portion 81 in the form of a punching metal having a large number of through-holes provided in a predetermined range on the side of the outlet 18 and a non-porous portion 82 located on the side plate 15 side. As shown in FIG. 2, a connecting portion 83 between the side plate 15 and the top plate 16 of the outer casing 11 is formed into a curved surface, and smoothly guides the airflow discharged from the discharge ports 61 and 62 toward the rectifying member 80. I can do it.

The cross section of the suction inlet member 34 has an upwardly convex curved shape, and its outer periphery is fixed to the upper surface plate 45 of the fan unit 12 by fixing parts 85 such as bolts or rivets. The inner peripheral portion 86 of the suction inlet member 34 extends downward toward the turbo fan 31.

Next, the operation of the blower 10 having the above configuration will be described. When the turbo fan 31 is rotated by the motor 32, the air sucked from the suction inlet member 34 by the rotation of the blade 40 passes through the fan 31 and passes through the air guide path 55 and the pressure recovery chambers 56 and 57 by centrifugal force.
Air is blown out from the discharge ports 61 and 62 into the first chamber 76 and the second chamber 77.

The air blown into the chambers 76 and 77 is turned by the flow regulating member 80 in the direction of the blowout port 18. However, since the chambers 76 and 77 are separated from each other by the partition member 75, the air inside the chambers 76 and 77 is kept inside the chambers 76 and 77. The blown air flows without hitting each other
8 is discharged toward the downstream device 19. For this reason, the vortex sound in the flow paths of the chambers 76 and 77 is also reduced, which can contribute to low noise.

When a sirocco fan is used as in the conventional apparatus, if a plurality of discharge ports are provided, the air volume and the static pressure are extremely reduced.
Is used, even if a plurality of discharge ports 61 and 62 are provided, the air volume and the static pressure hardly decrease. Therefore, the two-way discharge fan unit 12 of the present embodiment can be disposed in the center of the outer casing 11, and the weight of the entire blower 10 is balanced, and the airflow distribution to the downstream equipment 19 is also good.

In the blower 10 of the above embodiment, the variation of the airflow distribution with respect to the downstream equipment 19 is reduced to within 20% (40% for the conventional device), and the efficiency is 20% as compared with the conventional device.
Improved. Here, the efficiency means the static pressure efficiency of the blower, and is a value obtained by converting the amount of the air flow and the static pressure with respect to the input power into energy. The variation of the airflow distribution refers to the variation of the wind speed of each individual when the outlet 18 is divided into a number of sections.

In order to measure the noise generated by the air blower 10 of the present embodiment, a noise meter was provided at a position 1 m away from the outlet 18 to measure the noise.
It was confirmed that the noise was reduced by 10 to 10 decibels, and a great effect in reducing noise was recognized.

The present invention is similar to the scroll casing 90 of the four-way discharge type shown in FIG. 5, except that the third and fourth discharge ports 61 and 62 are the same as those of the above embodiment.
Can also be applied to those provided with the discharge ports 91 and 92 of FIG. In the case of this four-way discharge type scroll casing 90, the exit direction angle が formed by the discharge direction center line N of the third discharge port 91 and the fourth discharge port 92 with respect to the center axis n along the width direction of the casing 90. And the dimension L3 in the width direction of the scroll casing 90 with respect to the fan outer diameter D are set as follows.

That is, the exit direction angles の of the third discharge port 91 and the fourth discharge port 92 are respectively set to 35 ° ≦ ψ ≦ 38 °.
And the outlet direction angles γ of the first and second discharge ports 61 and 62 are set to 14 ° ≦ γ ≦ 17 ° as in the above embodiment. The dimension L1 in the longitudinal direction is 2.1D ≦ L1 ≦ 2.2D, and the dimension L3 in the width direction is in the range of 1.7D ≦ L3 ≦ 1.8D. This scroll casing 90 is also provided inside a scroll body 95 made of a closed-cell synthetic resin foam, with an air guide passage 55 and pressure recovery chambers 56, 57, 97, 98.
A coating layer 70 similar to that of the above-described embodiment is applied to at least a surface of the air guide path 55 and the inner surfaces of the pressure recovery chambers 56, 57, 97, and 98 that are in contact with the airflow, thereby forming a foam. And the chemical resistance and heat resistance are improved.

[0039]

According to the present invention, it is possible to obtain a high-efficiency blower that is small, has low noise, has a nearly uniform air flow distribution, and can exhibit stable performance. Also, in the outer casing
The first chamber and the second chamber are separated from each other
Blown into each chamber because it is partitioned by
Air flow in each chamber without colliding with each other
The air is discharged from the air outlet toward the downstream device. This
As a result, the vortex noise in the flow path of each chamber is also reduced, resulting in lower noise
Can contribute.

[Brief description of the drawings]

FIG. 1 is a plan view partially showing a cross section of a blower according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the blower shown in FIG.

FIG. 3 is a perspective view of the blower shown in FIG. 1 with a part cut away.

FIG. 4 is a schematic view showing a scroll casing of the blower shown in FIG. 1;

FIG. 5 is a schematic view showing a modified example of a scroll casing.

FIG. 6 is a perspective view showing an example of a conventional blower.

[Explanation of symbols]

10 blower, 11 outer casing, 12 fan unit, 18 outlet, 19 downstream equipment, 30
... scroll casing, 31 ... turbo fan, 32 ...
Motor, 40: blade, 41: fan rotation shaft, 50:
Outer plate, 51: scroll body, 52: scroll part,
61: first discharge port, 62: second discharge port, 70: coating layer, 75: partition member, 76: first chamber, 77: second chamber, 80: rectifying member, 90: scroll casing, 91 ... third discharge port, 92 ... fourth
Discharge port 95, scroll body.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-39828 (JP, A) JP-A-2-136628 (JP, A) JP-A 62-122223 (JP, U) JP-A 37- 26994 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 1/00 306 F04D 29/66 F24F 13/02 F24F 13/06 F24F 13/08

Claims (7)

(57) [Claims] 1. A blower comprising: an outer casing having a chamber therein; and a fan unit built in the outer casing and sending air to the chamber, wherein the fan unit includes a turbo fan having a swept wing. It comprises a scroll casing that accommodates this turbofan and a motor that rotates the turbofan,
The scroll casing has a scroll body made of a sound-absorbing material and an outer plate covering the outside of the scroll body. The scroll body has a scroll portion in which the turbofan is housed, and a rotation shaft of the turbofan. The first discharge port and the second discharge port are provided at 180 ° point symmetric positions with each other, and the fan unit is disposed in the outer casing.
The inside of the outer casing is the first channel.
A partition member for partitioning into a chamber and a second chamber is provided.
And the first discharge port is opened in the first chamber.
And the second discharge port is opened in the second chamber.
To the downstream air outlet across the air outlets of both chambers.
A blower characterized by comprising a vessel . 2. The exit direction angles (γ) of the first discharge port and the second discharge port with respect to a central axis along a longitudinal direction of the scroll casing are each in a range of 14 ° to 17 °. Blower. 3. A cut-off angle (β) of a cut-off portion inside the first and second discharge ports with respect to a central axis along a longitudinal direction of the scroll casing is in a range of 24 ° to 27 °. Blower. 4. The blower according to claim 1, wherein a third discharge port and a fourth discharge port are provided in the scroll casing at 180 ° point symmetry with respect to a rotation axis of the turbo fan. 5. The sound absorbing material constituting the scroll body is made of a closed-cell resin foam, and a coating layer made of a synthetic resin or a rubber-like elastic material is applied to a surface of the scroll portion in contact with an air flow. The blower as described. 6. The outer casing includes air discharged from the first discharge port into the first chamber and air discharged from the second discharge port into the second chamber, respectively. a rectifying member that guides the direction of the air outlet is provided, the rectifying member, claim having a porous portion, which opened a number of holes in a portion located above the blowout port side
The blower according to 1 . 7. The blower according to claim 1, wherein the blade cross section of the retreating wing of the turbofan has an aerofoil shape.