JPH07247992A - Vortex flow blower - Google Patents

Abstract

PURPOSE:To reduce noise of a vortex flow blower sufficiently while the outside diameter of a blower part is made smaller than the outside diameter of a motor to reduce the size of the blower. CONSTITUTION:In a vortex flow blower so constructed that an impeller 4 of a blower part 2 is arranged on the side near to a motor in the axial direction of a rotating shaft 3 of an induction motor 1 and a casing 8 is disposed remote from the motor, a muffling connecting path 32 including a sound absorbing material is provided on the back of the casing 8. Accordingly, the reduction of size and weight of a motor direct-coupled vortex flow blower can be accomplished by simple constitution, and reduction of noise can be accomplished, so that it is possible to provide a small-sized, light weight and low-noise vortex flow blower at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a general-purpose eddy current blower directly connected to an electric motor used for blowing air, and more particularly to a vortex blower suitable as a blower having a relatively small capacity.

[0002]

2. Description of the Related Art In recent years, the size and weight of vortex blowers have been reduced,
In response to increasing demands for higher discharge pressure and lower noise, various studies have been conducted on the shape and structure of the impeller and the method of operating the vortex blower. Examples include three-dimensional shape and high-speed rotation of the impeller using an inverter.

Regarding the three-dimensional shape of the impeller, it is difficult to manufacture the die-casting integrated type because the three-dimensional blade has a curved shape as compared with the conventional impeller having a two-dimensional blade. However, through various studies, it has come to be put into practical use by a manufacturing method mainly including plastic fastening. Regarding the structure of the impeller and the manufacturing method in that case, for example, JP-A-51-57011 discloses. Proposed.

By the way, a general structure of such a conventional electric vortex flow blower is as shown in FIG. In FIG. 6, 1 is an induction motor, 2 is a blower section (vortex flow blower section), 3 is a rotating shaft of the induction motor, 4 is an impeller of the vortex flow blower, 5 is a blade of the impeller, and 6 is an annular groove of the impeller. , 7 is an impeller blade casing, 8 is a vortex blower casing, 9 is a casing pressure path, 10 is a vortex blower suction port, 11 is a discharge port, 12 is a vortex blower cover, 13 is a cooling fan, and 14 is It is an end cover.

The induction motor 1 is of a fully closed type, and has a blower section 2 attached to one end of the rotary shaft 3 in the axial direction, and a cooling fan 13 and an end cover 14 at the other end.
And are provided. The blower unit 2 has an impeller 4 and a casing 8 as main parts, and the impeller 4 is directly attached to the rotary shaft 3 of the induction motor 1 and is rotationally driven by the induction motor 1.

The casing 8 is provided with a booster passage 9. The booster passage 9 is formed in an arc shape around the center of rotation of the impeller 4, that is, the center line C of the rotary shaft 3 of the electric motor 1. And open in a direction parallel to the center line C,
Moreover, as shown in the figure, it is formed as a groove having a semi-circular cross section. The annular groove 7 formed in the blade casing 6 of the impeller 4 is formed as an annular groove composed of concentric circles with the rotating shaft 3 as a center. Blade 5 is provided.

The impeller 4 is rotated toward the induction motor 1 so that the opening of the annular groove 7 faces the rotary shaft 3.
On the other hand, the casing 8 is attached to the induction motor 1 so that the open side of the booster passage 9 faces the impeller 4, and as a result, the casing 8 is attached to the induction motor 1. Located closer, on the other hand, impeller 4
Is located away from the induction motor 1. Further, since the suction port 10 and the discharge port 11 are communicated with the booster passage 9 of the casing 8, they are mounted facing the induction motor 1 side.

The cooling fan 13 is provided on the side opposite to the side where the blower section 15 of the induction motor 1 is provided, is driven to rotate by the induction motor 1, and is attached to the housing of the induction motor 1 by the end cover 14. Further, a flow F of cooling air shown by an arrow in the figure is created, whereby the outside of the induction motor 1 is cooled, and further the casing 8 is cooled.

However, this conventional vortex blower is
It was difficult to miniaturize, and the diameter of the blower part was easy to increase especially. That is, as described above, in the conventional swirl blower, regardless of the blade shape of the impeller, the impeller is installed on the side away from the driving electric motor and the casing is installed near the electric motor.

This is because the dynamic pressure of the fluid is converted into the static pressure in the casing portion, so that the heat generation in the casing portion becomes large, and it is necessary to cool it by the cooling fan as described above. The suction port and the discharge port to the blower part must be arranged toward the electric motor side, and therefore,
Since the suction port and the discharge port are arranged around the electric motor, the blower portion, that is, the outer diameter of the impeller and the casing has to be larger than the outer diameter of the electric motor, which makes miniaturization difficult. It was.

On the other hand, in view of the above problems of the prior art,
The inventors of the present invention have already proposed, as a prior art, an eddy-flow blower in which the outer diameter of the blower part can be set to be equal to or less than the outer diameter of the electric motor, and thereby the size can be sufficiently reduced. The vortex flow blower according to the above will be described as a prior art for the time being.

In this prior art, the impeller of the blower portion is arranged on the side closer to the electric motor in the axial direction of the rotary shaft of the driving electric motor, and the casing portion is arranged on the side farther from the electric motor. In addition, a suction port and a discharge port are provided on the opposite side of the induction motor to form a blower portion having substantially the same diameter as the induction motor.

As a result, in this prior art, by thus setting the installation position of the impeller of the blower part in the axial direction of the rotary shaft of the drive motor, the position closer to the motor, Is in the opposite direction to the motor,
As a result, the suction port and the discharge port of the blower unit can also be provided in the direction opposite to the direction toward the electric motor.Therefore, there is no restriction on the outer diameter of the blower unit, and the electric motor for driving can be removed. Therefore, the diameter can be made the same, and the size can be reduced.

As a result, in the prior art, there is no possibility that the passage of the cooling air from the cooling fan provided on the opposite side of the electric motor will be blocked by the impeller of the blower section, and the cooling air from the cooling fan will not flow. Since it can be easily guided to the casing portion, it is possible to easily cope with heat generation of the casing.

Further, as a result, in the prior art, the blower portion side bearing of the drive motor can be mounted not on the casing side of the blower portion but on the cover portion of the impeller, and against the temperature rise of the bearing. Also has an advantageous structure.

However, the performance deterioration due to the reduction of the diameter of the blower portion can be sufficiently compensated by using an induction motor as a driving motor and increasing the rotation speed by driving the inverter. Therefore, in this prior art, it is possible to obtain a compact and high wind pressure vortex flow blower.

Therefore, a swirl blower according to this prior art (hereinafter referred to as a prior art example) will be described below. First, FIG. 7 is a first prior art example, FIG. 7 (a) is a side view with a partial cross section, and FIG. 7 (b) is a front view as seen from the blower side. 1, a blower unit (vortex flow blower unit) 2, a rotary shaft 3, an impeller 4, a blade 5, an annular groove 6,
The blade casing 7, the casing 8, the pressurizing passage 9, the suction port 10, the discharge port 11, and the cover 12 of the vortex blower are the same as those in the conventional example of FIG.

The difference between the prior art example of FIG. 7 and the conventional example of FIG. 6 is as follows. First, the impeller 4 is located on the rotary shaft 3 of the induction motor 1 on the side close to the induction motor 1, and as a result, the casing 8 is located on the side away from the induction motor 1 and outside the impeller 4. It is provided. Therefore, the annular groove 7 of the impeller 4 is opened in the direction opposite to the induction motor 1 side, while the booster path 3 of the casing 8 is opened toward the induction motor 1.

Next, by locating the casing 8 on the outside in this way, the suction port 10 and the discharge port 11 attached to the casing 8 are also in a direction opposite to the direction toward the induction motor 1, that is, It can be installed outwards and is so configured.

Further, since it is not necessary to provide the suction port 10 and the discharge port 11 around the induction motor 1 in this way, the blower portion 2 can have the same diameter as the outer diameter of the induction motor 1. , So configured.

Therefore, according to this prior art example, the external dimensions of the induction motor 1 and the blower section 2 can be made almost the same, and a swirl blower having a neat shape and a sufficiently small size can be easily obtained. You can

Further, according to this prior art example, the casing 8
Since it is on the outside, it is not necessary to separately provide the cover 12 as in the conventional example of FIG. 6, and the cover 12 can be provided integrally with the casing 8. Therefore, there is an advantage that the configuration can be simplified.

By the way, in the prior art example of FIG. 7, a fully-closed type natural cooling type electric motor is used as the induction motor 1. Therefore, the cooling of the blower unit 2 is also a natural cooling type. ing. Therefore, as shown in the conventional example of FIG. 6, when the fully closed induction motor 1 is used, a cooling fan 13 is generally provided at the end of the induction motor 1 as shown in the figure. In general, the induction motor 1 and the blower unit 2, especially the casing 8, are cooled by the provision thereof.

Therefore, as a second prior art example, a case where cooling is considered will be described below with reference to FIG.
6 is different from the preceding example of FIG. 7 in that the preceding example of FIG.
Similar to the conventional example, only the cooling fan 13 and the end cover 14 are provided. As a result, when the impeller 3 of the blower unit 2 is rotationally driven by the induction motor 1, this cooling fan 13 is also rotationally driven, and the action of the end cover 14 causes the flow of cooling air as shown by the arrow in the figure. F is obtained, whereby the induction motor 1 and the blower unit 2 can be forcibly cooled, and the temperature rise can be sufficiently suppressed.

As described above, according to the present invention, since the electric motor and the blower portion can be made to have substantially the same outer diameter, the blower portion 2 of the induction motor 1 is different from that of the prior art example of FIG. The fan 14 provided on the opposite side can also guide the cooling air to the casing 8 side of the blower unit 2, and sufficient cooling can be obtained as in the conventional example of FIG.

Next, FIG. 9 shows a third prior art example, FIG. 9 (a) is a side view with a partial cross section, and FIG. 9 (b) is a front view seen from the blower side. This precedent is the same as the precedent of FIG.
A plurality of cooling fins 14 are provided on the outer surfaces of the casing 8 and the cover 12 of the blower unit 2, and other points are the same as in the prior art example of FIG.

As is well known, the higher the rotational speed of the impeller 4 and the stronger the degree of throttle of the flow rate at the suction port 10 or the discharge port 11, the more internal the blower. Since the amount of friction of the air increases, the amount of heat generated in the blower unit 2 increases and the temperature rise tends to increase.

Therefore, in the prior art example of FIG. 9, the cooling fins 15 are attached to increase the area where the casing 8 is in contact with the outside air, and the gap between the cooling winds is as shown by the arrow. By passing F, a higher cooling effect can be obtained. Therefore, according to this prior art example, the temperature rise can be suppressed more sufficiently and the size can be further reduced. .

In this prior art example, the cooling fins 14 are provided not only on the outer peripheral portion of the blower section 2 but also on the casing 8
Since it is extended to the end surface on the side opposite to the induction motor 1 side, the surface area can be sufficiently increased, and a higher cooling effect can be easily obtained.

Next, FIG. 10 shows a fourth prior art example, which is shown in FIG.
Is a side view with a partial cross section, and FIG. 6B is a front view seen from the blower side. In this prior art example, a casing cover 16 is attached to the outside of the casing 8 in order to more positively cool the casing 8. The casing cover 16 is the induction motor 1 of the casing 8.
As shown by the arrow, it functions to form an air guide path 17 for guiding the cooling air F on the end surface opposite to the side, so that the casing 8 can be sufficiently cooled and the temperature rise due to the size reduction. It can be surely suppressed.

It is needless to say that also in the prior art example of FIG. 10, the cooling fins 15 shown in the prior art example of FIG. 9 may be provided and the cooling fins and the casing cover 16 may be combined to obtain cooling. .

By the way, although not particularly described in the above prior art example, it goes without saying that some kind of mounting means is required when using the vortex flow blower. Therefore, the mounting means in such a swirl blower will be described below as prior examples.

First, FIG. 11 shows a fifth prior art example in which a trapezoidal bracket 18 used for a general-purpose small induction motor or the like is provided in the above-mentioned vortex flow blower.
Is a side view with a partial cross section, and FIG. 6B is a front view seen from the blower side. In this swirl blower, the outer diameter of the blower portion 2 can be made substantially the same as that of the induction motor 1. Therefore, as shown in the preceding example of FIG. 11, the trapezoidal bracket 18 attached to the induction motor 1 can be used as it is. It can be used directly as a base for mounting a swirl blower.

In the prior art example of FIG. 11, the mounting position of the trapezoidal bracket 18 to the induction motor 1 corresponds to the suction port 10 and the discharge port 11 of the blower unit 2 as shown in FIG. Therefore, it is configured so that it can be arbitrarily selected at any of the positions a to d shown in the figure.Therefore, the mounting posture of the vortex blower can be arbitrarily changed according to the usage state, and the layout of the equipment is always The optimum state can be achieved.

Next, FIG. 12 shows a sixth prior art example, in which the casing 8 of the blower unit 2 is attached to the casing 8 of the female screw stud type.
In the example shown in FIG. 3A, a partial cross-section is a side view, and FIG. 6B is a front view seen from the blower side. As an installation state of the vortex flow blower of the prior example, it may be possible to install the vortex flow blower vertically with the rotating shaft 3 being vertical.
If the casing 8 of the blower unit 2 is provided with the mounting member 19 as in the prior art example of FIG. 12, the outer diameter of the blower unit 2 is the same as the outer diameter of the induction motor 1 together. ,
The installation projected area of the eddy current blower can be made the same as that when only the induction motor 1 is installed. Therefore, according to this prior example, it can be easily applied even when there is no room in the installation space. There is. It should be noted that this FIG.
In the second prior art example, the number of mounting members 19 is three, but needless to say, the prior art example of the present invention is not limited to three.

On the other hand, in a seventh prior art example shown in FIG. 13, a female thread stud type mounting member 21 is provided on the end bracket 20 of the induction motor 1 on the side opposite to the blower section 2. In FIG. 13, (a) is a side view with a partial cross section, and (b) is a front view as seen from the induction motor side. Therefore, this precedent example has the same advantages as the precedent example of FIG. 12, and is also an effective precedent example when the top and bottom are inverted due to the installation location.

Next, FIG. 14 shows an eighth prior example, and FIG.
Is an example in which an L-shaped mounting member 22 is provided instead of the female screw stud-shaped mounting member 19 in the preceding example.
The figure (a) is a side view with a partial cross section, and the figure (b) is a front view seen from the blower side.

FIG. 15 shows a ninth prior art example, which is also the female thread stud type mounting member 2 in the prior art example of FIG.
It is an example of the case where an L-shaped mounting member 23 is provided instead of 1, in which FIG. 1 (a) is a side view with a partial cross section, and FIG. 1 (b) is a front view seen from the induction motor side. Is.

In the preceding examples of FIGS. 14 and 14, the mounting area required for installing the vortex blower is slightly increased as compared with the preceding examples of FIGS. 12 and 13, but the degree of freedom in installing the vortex blower is increased. Is a valid precedent example.

Next, the mounting condition of the vortex flow blower according to the prior example in use will be described. First, FIG. 16 (a)
Shows an example in which the eddy current blower according to the sixth prior example shown in FIG. 12 is attached to the surface of the installation member A having a certain angle with respect to the horizontal plane, and FIG. On the surface of the installation member B which is perpendicular to the 7th position shown in FIG.
It is an example when the overflow blower according to the preceding example is attached.

In this example, the induction motor 1 is overhung from the blower section 2. However, according to the prior art, the size of the induction motor 1, the strength of the housing, and the connection section with the blower section 2 are used. By appropriately selecting the strength and the like, such mounting can be easily performed. Therefore, according to these prior art examples, the degree of freedom regarding the layout of the device can be further increased.

The mounting example shown in FIG. 16 is similar to that shown in FIG.
4 and the preceding example of FIG. 15, the same is true, and similarly, the degree of freedom regarding the layout of the device can be increased.

Next, FIG. 17 is a circuit diagram showing an example in which an eddy current blower is combined with an inverter 30 and the induction motor 1 is driven by the output of the inverter 30.

The factors that determine the aerodynamic characteristics of the vortex blower are:
It is composed of various parameters such as the size and shape of the impeller 4, the shape of the casing 8, the area of the ventilation passage, the shapes of the suction port 10 and the discharge port 11. Among them, the parameters relating to the static pressure of the vortex flow blower include, in particular, the outer diameter dimension of the impeller 4 and its rotation speed.

The eddy-flow blower according to the prior example has an advantage that the outer diameter of the impeller 4 can be made smaller than the outer diameter of the impeller of a general eddy-flow blower having an induction motor of the same output. On the other hand, as it is, the discharge pressure,
There is a problem that both the air volume decreases. Therefore, in order to deal with this problem, it is sufficient to increase the rotation speed of the impeller 4. For this purpose, as shown in FIG. 17, frequency conversion is performed using the inverter 30 to drive the motor. The frequency of the electric power supplied to the induction motor 1 may be set higher than the frequency of the power source.

First, the air flow rate of the vortex blower is generally proportional to the rotational speed of the impeller, and the pressure is proportional to the square of the rotational speed. Therefore, when the rotational speed to be increased is calculated from the degree of reduction of the diameter of the impeller 4 in the prior art example, if the rotational speed is tripled, the induction motor 1 will be compared with the conventional vortex flow blower. It can be seen that a pressure equivalent to twice the output of is obtained. That is, in FIG. 17, when the frequency of the commercial power supply AC is f (50 Hz or 60 Hz), the output frequency of the inverter 30 may be 3f (150 Hz or 180 Hz).

Therefore, in the prior art example, when the inverter 30 is used in this way, there is a type in which the inverter 30 is built in and integrated with an overcurrent blower. It is designed to operate as a single unit in the same manner as a swirl blower, and the following is a description of a prior art example as described above.

First, the eleventh prior example of FIG. 18 is shown in FIG.
This is an example of the prior art example of the eddy current blower described in 1., in which the inverter 30 is attached to the housing of the induction motor 1. FIG. 1A is a side view with a partial cross section, and FIG. It is the front view seen from the blower side.

As shown in the figure, the inverter 30 is mounted so as to be floated from the housing of the induction motor 1 so that the flow of the cooling air F by the cooling fan 13 is not obstructed and the inverter 30 itself. I am trying to obtain cooling. And this inverter 3
With respect to the mounting position of 0, any one of (1) to (4) shown in the figure can be arbitrarily selected, so that the restriction due to the mounting state at the place of use can be eliminated.

Next, FIGS. 19 to 21 show twelfth to fourteenth.
19 is an example of the case where the inverter 30 is installed inside the end cover 14 of the induction motor 1 so that cooling can be obtained. First, FIG. 19 utilizes the suction air of the cooling fan 13 to perform cooling. It is a precedent example in the case where is obtained. Next, FIG. 20 is a prior example in the case where cooling is obtained using the cooling air F sent from the cooling fan 13. Further, FIG. 21 shows the cooling fan 13
As a substitute for the commonly used mixed flow impeller,
This is a prior art example in which an axial fan is used and the inverter 30 is thereby attached to the end bracket 20 of the induction motor 1.

By the way, the swirl blower described in the above-mentioned prior examples is not particularly limited in the capacity to be applied and can be applied regardless of the capacity of the electric motor. Since it can be easily made compact and lightweight, it can be said that it is particularly suitable for a usage in which it is attached to a moving object and the vortex blower also moves together.

[0052]

The above-mentioned prior art (prior art) does not give particular consideration to the increase in noise accompanying miniaturization, and has a problem in terms of quietness of operation. That is, in the prior art, as a result of miniaturization, the necessity of increasing the rotation speed increases correspondingly, and therefore noise from the blower unit increases. An object of the present invention is to provide an eddy-flow blower which has a sufficiently small noise while the outer diameter of the blower portion is smaller than the outer diameter of the electric motor and is downsized.

[0053]

The above object is to arrange the impeller of the blower portion on the side closer to the electric motor in the axial direction of the rotating shaft of the electric motor, so that the casing is farther from the electric motor. In the vortex blower arranged in the above, this is achieved by providing a sound deadening passage provided with a sound absorbing material on the back surface of the casing.

[0054]

Most of the noise of the overflow blower is sent to the outside from the booster passage provided in the casing, and the muffling passage communicates with this booster passage and at least one of the suction port and the discharge port. Therefore, the noise can be sufficiently suppressed. On the other hand, since this muffling passage is provided on the back surface of the casing, the diameter of the blower portion does not increase, so miniaturization is not hindered. Therefore, a small, low-noise overcurrent blower is provided. Will be obtained.

[0055]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The overflow blower according to the present invention will be described in detail below with reference to the illustrated embodiments. Figure 1
This embodiment is an embodiment of the present invention in which the present invention is applied to the preceding example described in FIG. 11, in which 31 is a communication passage, 32 is a sound absorbing material, 33 is a flange, and 34 is a casing cover. Others are the same as the preceding example of FIG. In addition, in FIG. 1, (a) is a side view with a partial cross-section, and (b) is a front view showing the casing cover 34 removed. Here, in FIG. , Discharge port 11b (in the example of FIG.
1) is omitted.

As shown in FIG. 1 (a), the communication passage 31 is formed by shaving the members constituting the casing 8 from the rear surface of the casing 8 (the surface opposite to the electric motor 1). The cross-sectional shape is a groove having a substantially U shape, and as shown in FIG. 2B, the planar shape thereof is substantially an inverted V shape, and the discharge side opening 11a of the pressurizing passage 9 is provided at the discharge port 11b. It is provided so as to communicate with each other. In this embodiment, the casing 8 is integrally formed with the cover 12 of the overflow blower by die casting of aluminum or its alloy.

The sound absorbing material 32 is a material having excellent sound absorbing property, such as a sponge-like plastic foam or felt, and is placed in the casing 8 along the inner surface and the outer surface of the communication passage 31. It is provided in the formed groove. A part of the portion facing the communication passage 31 is directly exposed in the communication passage 31. The exposed portion of the sound absorbing material 32 is represented by 32a.

The flange 33 is attached to the end of the discharge port 11b, and is used as a mounting member for a pipe line to be connected to the discharge port 11b. Casing cover 3
Reference numeral 4 denotes a thin disk-shaped member attached to the back surface of the casing 8 and made of, for example, a light alloy. The groove 4 serves as the communication passage 31 formed on the back surface of the casing 8 and the sound absorbing material 32.
The groove accommodating the is closed to form an independent communication passage 31.

Therefore, according to this embodiment, the air compressed in the pressure-increasing passage 9 and sent out from the discharge side opening 11a is not directly discharged from the discharge port 11b, but is first discharged from this opening 11a. Guided into the communication passage 31,
The inside of the communication passage 31, which is relatively long due to the inverted V-shape, passes through the sound absorbing material 32 while being in contact with the sound absorbing material 32 before being sent to the discharge port 11b. As a result, Since noise components are absorbed, noise can be suppressed sufficiently.

In this embodiment, since the groove for accommodating the communication passage 31 and the sound absorbing material 32 is formed by utilizing the back surface of the casing 8, the space utilization factor is good and the overall size is increased. It can be minimized, and it is possible to obtain both miniaturization and low noise at the same time.

Next, FIG. 2 shows another embodiment of the present invention.
This embodiment differs from the embodiment of FIG. 1 in that the discharge port 11
b is not provided with the flange 33, and the discharge port 11b does not come out from the back surface of the casing 8, but is only open to the outside from the circumferential surface of the casing 8. The other points, including effects, are the same as those of the embodiment of FIG.

FIG. 3 shows another embodiment of the present invention. In this embodiment, muffler communication passages are provided at both the suction port and the discharge port. Pressure rising passage 9 Suction side opening, 10b suction port, 31a suction side communication passage, 31b discharge side communication passage, 33a suction port flange, 33b discharge port flange, and others 1, the same as the embodiment of FIG. In this example,
The sound absorbing material 32a is provided on both the suction port 10b and the discharge port 11b.
Since the muffling communication passages 31a and 31b provided with 32b are provided, it is possible to obtain further excellent low noise characteristics.

By the way, in each of the above embodiments, the casing 8 itself is provided with a sound-deadening communication passage. However, in the present invention, a sound-absorbing material may be used to form the communication passage. 4 is one of the embodiments, and this embodiment is
The back surface of the pressurizing passage 9 of the casing 8 is formed into a cylindrical shape, and the space 35 formed by this is used as a communication passage from the discharge side opening 11a of the pressurizing passage 9 to the discharge port 11b. The sound absorbing material 32 is attached to the inner surface of the circumference to obtain a sound absorbing action. Other configurations are as follows.
This is the same as the embodiment of FIG.

FIG. 5 is also an embodiment of the present invention. In this embodiment, the back surface portion of the pressurizing passage 9 of the casing 8 is formed into a cylindrical shape to form a space, and the partition wall portion 3 extending in the vertical direction.
6 are provided so that independent spaces 35a and 35b are formed on the left and right sides, the space 35a forms a communication passage on the suction side, and the space 35b forms a communication passage on the discharge side. The sound absorbing materials 32a and 32b are attached to the inner surface of the member to be used, and other configurations are the same as those of the embodiment of FIG.

Therefore, according to the embodiments of FIGS. 4 and 5, a small-sized and low-noise overflow blower can be obtained and the structure of the casing 8 is simple, as in the embodiments of FIGS. Therefore, the cost can be further reduced.

In the above description, the embodiments in which the present invention is applied to the preceding example described in FIG. 11 have been described. However, the present invention is not limited to the preceding example in FIG. Two
It goes without saying that any one of the preceding examples may be implemented.

[0067]

As described above, according to the present invention, it is possible to reduce the size and weight of a vortex flow blower directly connected to an electric motor with a simple structure and to reduce noise sufficiently. Can be provided easily.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a first embodiment of a vortex flow blower according to the present invention.

FIG. 2 is an explanatory view showing a second embodiment of the vortex flow blower according to the present invention.

FIG. 3 is an explanatory view showing a third embodiment of the vortex flow blower according to the present invention.

FIG. 4 is an explanatory view showing a fourth embodiment of the vortex flow blower according to the present invention.

FIG. 5 is an explanatory view showing a fifth embodiment of the vortex blower according to the present invention.

FIG. 6 is an explanatory diagram showing a conventional example of a vortex flow blower.

FIG. 7 is an explanatory diagram showing a first prior art example of an eddy current blower.

FIG. 8 is an explanatory diagram showing a second prior art example of an eddy current blower.

FIG. 9 is an explanatory diagram showing a third prior art example of an eddy current blower.

FIG. 10 is an explanatory diagram showing a fourth prior art example of an eddy current blower.

FIG. 11 is an explanatory diagram showing a fifth prior art example of an eddy current blower.

FIG. 12 is an explanatory diagram showing a sixth prior art example of an eddy current blower.

FIG. 13 is an explanatory diagram showing a seventh prior art example of an eddy current blower.

FIG. 14 is an explanatory diagram showing an eighth prior art example of an eddy current blower.

FIG. 15 is an explanatory diagram showing a ninth prior art example of an eddy current blower.

FIG. 16 is an explanatory diagram showing a tenth prior art example of an eddy current blower.

FIG. 17 is an explanatory diagram showing an example of a case where an overcurrent blower is driven by an inverter.

FIG. 18 is an explanatory diagram showing an eleventh prior art example of an overflow blower.

FIG. 19 is an explanatory diagram showing a twelfth prior art example of an eddy current blower.

FIG. 20 is an explanatory diagram showing a thirteenth prior art example of an eddy current blower.

FIG. 21 is an explanatory diagram showing a fourteenth prior art example of an eddy current blower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Induction motor 2 Blower part 3 Rotating shaft 4 Impeller 5 Blade 6 Annular groove 7 Blade casing 8 Casing 9 Booster path 10a Suction side opening 10, 10b Suction port 11a Discharge side opening 11, 11b Discharge port 12 Cover of vortex blower 13 Cooling Fan 14 End Cover 18 Trapezoidal Bracket 19 Female Thread Stud Type Mounting Member 20 End Bracket 21 Female Thread Stud Type Mounting Member 22 L-Shaped Mounting Member 23 L-Shaped Mounting Member 30 Inverter 31 Communication Passage 32 Sound Absorbing Material 33 Bracket 34 Casing cover 35 Space

Claims (2)

[Claims] 1. A blower section comprising a combination of an impeller having a plurality of blades provided in an annular groove having a substantially semicircular cross section, and a casing having an arc-shaped ventilation passage facing the annular groove. In a vortex flow blower of a motor direct connection type, wherein the impeller is located on a side closer to the motor on a rotation shaft of a drive motor, and the casing is located on a side distant from the motor. A swirl blower, characterized in that a sound deadening passage is provided between the arc-shaped ventilation passage that is provided and at least one of a suction port and a discharge port that are provided in the casing. 2. The swirl blower according to claim 1, wherein the sound deadening passage is provided with a sound absorbing material.