JP2001317485A - Centrifugal air blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To linearize the suction direction and the delivery direction in a thin type, reduce noise, and realize high efficiency. SOLUTION: The inside of a cross-sectional rectangular box-shaped casing 3 is vertically divided into two parts by a partition plate 5 to arrange a suction chamber 7 and a delivery chamber 9. A suction port 19 for sucking air is arranged on one side surface side of the suction chamber 7 adjacent to the partition plate 5. A delivery port 21 for delivering the air is arranged on one side surface side of the delivery chamber 9 positioned on the almost opposite side to this suction port 19 and adjacent to the partition plate 5. A suction hole 37 communicating the suction chamber 7 and the delivery chamber 9 is arranged in the almost center of the partition plate 5. An impeller 25 is arranged in the delivery chamber 9 for generating an air current for turning to the delivery port 21 of the delivery chamber 9 by sucking the air of the suction chamber 7 from the suction hole 37. The air sucking direction and the deliverty direction become almost linear to simplify a piping structure of a suction duct connected to the suction port 19 and a delivery duct connected to the delivery port 21. Weight is reduced in a thin type. This centrifugal air blower can be inexpensively and easily arranged in a narrow place with a simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal blower which can be installed in a narrow space such as a floor, a ceiling, a wall and the like and can be formed thin.

[0002]

2. Description of the Related Art Conventionally, centrifugal blowers have been used for ventilation and air conditioning of buildings and stores. In the conventional centrifugal blowers, centrifugal force is given to air by rotation of an impeller provided in a casing. And the air is pumped,
In order to minimize energy loss, the air suction direction and the air discharge direction are orthogonal. When a conventional centrifugal blower is used for air conditioning, for example, a suction duct communicating with a building room is connected to a suction port of the centrifugal blower, while a discharge duct communicating with an air filter is connected to a discharge duct of the centrifugal blower. It is connected to the exit.

[0003] In general, in order to make a blower equipped with a standard multi-blade fan into a sound deadening type, a sound deadening box with a sound absorbing panel material lined is separately manufactured, and this sound deadening box is incorporated into the blower. Is a commonly used method.

[0004]

By the way, in recent building construction, it is strongly demanded to minimize the space required for equipment, piping and the like to increase the available space in the building. On the other hand, individualization of air conditioners has been promoted from the viewpoint of comfortable environment control technology and energy saving, and the size of the blower itself has been reduced.

As described above, the conventional centrifugal blower is installed in a narrow space because the air suction direction and the discharge direction are orthogonal to each other, and the axial directions of the suction duct and the discharge duct do not match. However, since the duct piping is troublesome, there is a problem that the installation time is required and the piping method is complicated, and the air conditioning efficiency is reduced because the piping length is long.

[0006] Therefore, there is a demand for a centrifugal blower having a structure in which the air suction direction and the air discharge direction are linear so as to enable a straight piping like an axial flow blower.

In addition, the centrifugal blower is required to be able to reduce the energy loss as much as possible, even if the air intake and discharge directions are linear.

Further, as described above, the conventional method for silencing the blower has problems that the cost is high, the resistance loss of the air flow is generated, and the blowing efficiency is reduced.

In view of the market needs described above, the centrifugal blower to be employed is required to be small and thin so that it can be installed in a narrow space such as a floor, a ceiling, or a wall. In terms of performance, performance equal to or higher than that of a conventional blower is required.

An object of the present invention is to provide a centrifugal blower which is thin, has a linear suction and discharge direction, and has low noise and high efficiency. It is in.

[0011]

According to a first aspect of the present invention, there is provided a centrifugal blower according to the present invention, wherein the inside of a rectangular box-shaped casing is divided into upper and lower parts, one of which is a suction chamber. Provide a partition plate forming the other in the discharge chamber,
A suction port for sucking air is provided on one side of the suction chamber adjacent to the partition plate, and air is provided on one side of the discharge chamber adjacent to the partition plate at a position substantially opposite to the suction port. Is provided, and a suction hole communicating the suction chamber and the discharge chamber is provided substantially at the center of the partition plate,
An impeller for sucking air from the suction chamber through the suction hole and generating an airflow toward the discharge port through the discharge chamber is provided in the discharge chamber, and a rotational drive unit for rotating the impeller is provided in the suction chamber. It is characterized by becoming.

Therefore, since the suction direction and the discharge direction of the air are substantially linear, the piping structure of the suction duct connected to the suction port and the discharge duct connected to the discharge port is simple, thin and lightweight. Is simple and inexpensive, so it is easy to install it in a narrow place.

According to a second aspect of the present invention, there is provided a centrifugal blower according to the present invention, wherein a suction port for sucking air is provided on one side surface of a casing having a rectangular box shape, and a discharge port for discharging air is provided on the other side surface of the casing. A swirl chamber is formed in the casing that forms a suction chamber communicating one of the upper and lower portions of the casing with the suction port and a discharge chamber that communicates the other with the discharge port. The discharge chamber facing the discharge port side between the spiral chamber and the upper surface or the lower surface of the casing in order to partition the discharge chamber and the suction chamber on the discharge port side of the spiral chamber and to provide a curved shape of the convex outer surface. Provide a diagonal plate that is inclined in the direction to gradually expand,
A suction hole communicating with the suction chamber is provided substantially at the center of the spiral chamber, and an impeller for sucking air from the suction chamber through the suction hole and generating an airflow toward the discharge port is provided in the spiral chamber. The suction chamber is provided with a rotation drive means for rotating the suction chamber.

Therefore, since the suction direction and the discharge direction of the air are reliably linear, the piping structure of the suction duct connected to the suction port and the discharge duct connected to the discharge port is simple, thin and lightweight. Since the structure is simple and inexpensive, it can be easily installed in a narrow place. Moreover,
As compared with the centrifugal blower according to claim 1, the airflow is smoothly accelerated in the suction chamber from the suction port, flows into the impeller in a uniform state, and smoother deceleration is obtained from the discharge chamber toward the discharge port. , Energy loss is minimized,
Low noise and thinning are achieved.

According to a third aspect of the present invention, there is provided the centrifugal blower according to the first or second aspect, wherein a sound absorbing panel material is lined on an inner wall surface of the casing.

Therefore, the simple external shape of the rectangular parallelepiped of the casing can be very easily silenced simply by lining the sound absorbing panel material on the inner wall surface of the casing, and the resistance loss hardly increases at the minimum cost.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a centrifugal blower according to the present invention will be described with reference to the drawings.

Referring to FIGS. 1 and 2, the centrifugal blower 1 according to the first embodiment has a casing 3 having a rectangular box shape in cross section, in other words, a substantially rectangular parallelepiped shape. Is vertically divided into two parts by a partition plate 5 to form a suction chamber 7 at an upper part and a discharge chamber 9 at a lower part. In addition, the upper part in the casing 3 may be the discharge chamber 9 and the lower part may be the suction chamber 7.

For example, as the casing 3, a rectangular frame 11 composed of an L-shaped frame, a ceiling plate 13,
The bottom plate 15 and the side plate 17 are screwed. However, the structure of the casing 3 is not particularly limited.

Further, an opening as a suction port 19 for sucking outside air (air) is provided on one side surface of the suction chamber 7 on the left side in FIG. 1, and in the first embodiment, the suction chamber 7 is provided.
1 of FIG.
9 is formed. The ceiling surface and the other three sides of the suction chamber 7 are closed by a ceiling plate 13 and side plates 17.

Further, an opening as a discharge port 21 for discharging air in the discharge chamber 9 is provided on one side surface of the discharge chamber 9 on the right side in FIG. In FIG. 1, the entire right side surface is formed in an open discharge port 21. The bottom surface and the other three side surfaces of the discharge chamber 9 are closed by a bottom plate 15 and a side plate 17.

As described above, the suction port 19 and the discharge port 21 are provided on the opposing side surfaces of the casing 3 having a substantially rectangular parallelepiped shape so that the air suction direction and the air discharge direction are substantially linear. . In addition, the suction port 19 and the discharge port 21 are respectively partially provided on the corresponding one side surface of each of the chambers 7 and 9, and the entire one side surface of each of the chambers 7 and 9 is opened. No problem.

In the center of the partition plate 5 in FIG. 2, a portion of the impeller 25 for mounting an impeller 25 provided with, for example, a motor 23 as a rotation driving means in the discharge chamber 9 is provided. An insertion hole 27 that can be inserted is provided.

In the impeller 25 of the first embodiment, a large number of blades 33 are sandwiched between a disk-shaped support plate 29 and a donut-shaped disk-shaped holding plate 31. Is configured to have substantially the same inclination angle with respect to the direction of the rotation center of the impeller 25, but the centrifugal impeller 25 may have another structure, and is not particularly limited. Further, the impeller 25 is provided such that the center of rotation of the support plate 29 is attached to the tip of the drive shaft of the motor 23 via the boss 35 and is driven to rotate.
Therefore, as shown in FIGS. 1 and 2, after the part of the impeller 25 is inserted into the discharge chamber 9 through the insertion hole 27 of the partition plate 5, Is fixed to the frame 11 of the casing 3 with screws via the bracket 37.

An air guide plate 41 provided with a suction hole 39 for guiding the air in the suction chamber 7 to flow into the center of the impeller 25 so as to project inside the insertion hole 27. 5 is fixed by bolts BT. The ceiling plate 13 is fixed to the frame 11 of the casing 3 with bolts BT.

According to the above configuration, when the impeller 25 is rotated by the rotation of the motor 23, the outside air (air) is supplied from the left side to the suction port 1 as shown by an arrow A in FIGS.
9, the air flows into the suction chamber 7 and is sucked so that the air in the suction chamber 7 flows from the suction hole 39 to the center of the impeller 25 as indicated by the arrow B. Since the air in the center of the impeller 25 is sent outward by centrifugal force of the rotation of the impeller 25, the air in the discharge chamber 9 is indicated by an arrow C in FIGS.
The ink is discharged from the discharge port 21 to the right as shown by.

As described above, in the centrifugal blower 1 of the first embodiment, since the air suction direction and the discharge direction are substantially linear, the centrifugal blower 1 is connected to the suction duct connected to the suction port 19 and the discharge port 21. Since the piping structure of the discharge duct to be used is simple, thin and lightweight, the structure is simple and inexpensive, it is suitable for installation in a narrow place.

Note that a guide plate 43 (rectifying plate) may be attached to each of the suction chamber 7 and the discharge chamber 9 for the purpose of rectifying the airflow, if necessary. For example, as shown by an arrow B, the air flowing into the suction chamber 7 is
The guide plate 43 (rectifying plate) is partially shown by a two-dot chain line in FIG. 2 so that the flow is rectified in a direction obliquely flowing into the central portion of the impeller 25 following the rotation direction of the impeller 25 from 9. It may be provided as described. A rectifying plate (not shown) attached to the discharge chamber 9 can be provided so that the airflow generated by the impeller 25 flows smoothly toward the discharge port 21.

Next, a second embodiment of the centrifugal blower of the present invention will be described with reference to the drawings.

A centrifugal blower 45 according to the second embodiment
Is an improvement made to solve the following problems of the centrifugal blower 1 of the first embodiment.

That is, the centrifugal blower 1 of the first embodiment
A phenomenon in which the cross section of the suction port 19 and the discharge port 21 cannot be made large due to the shape restriction, so that the speed of the air flow inside the casing 3 tends to be too high, and the air flow is biased, a so-called phenomenon. Disturbance of the air flow inside the casing 3 may occur due to local eddy current due to the drift, and energy loss may occur.

In other words, the efficiency and noise are reduced due to discontinuous and unreasonable rapid acceleration / deceleration of the air flow due to the sudden halving of the cross section near the suction port 19, disturbance of the local flow velocity, and fluid loss due to separation / vortex flow. May occur. Since this tendency becomes more conspicuous as the casing 3 becomes thinner, the centrifugal blower 1 according to the first embodiment is applied within a range where power and noise do not matter.

Referring to FIG. 3 to FIG. 6, in a centrifugal blower 45 according to the second embodiment, the casing 47 has a box-like tubular shape with a rectangular cross section, in other words, a rectangular parallelepiped tubular shape. For example, as shown in FIG. 5 and FIG. 6, the casing 47 is formed by bending substantially upward in a C-shape so as to form the bottom wall 49 and the side wall 51, and is provided with a flange portion 53 at an upper portion. As shown in FIG. 3, the ceiling plate 55 is screwed to the flange 53. However, the structure of the casing 47 is not particularly limited.

An opening as a suction port 57 for sucking outside air (air) is provided on the left side surface of the casing 47 in FIG. 3. In the second embodiment, the left side of the casing 47 in FIG. One side surface is entirely formed in the opened suction port 57.

A discharge port 5 for discharging air inside the casing 47 is provided on the right side surface of the casing 47 in FIG.
An opening 9 is provided, and in the second embodiment, the entirety of the right side in FIG.

As described above, the suction port 57 and the discharge port 59 are provided on opposite sides of the rectangular parallelepiped casing 47 so that the air suction direction and the air discharge direction are substantially linear. . In addition, the suction port 57 and the discharge port 59 may be respectively partially provided on the corresponding one side surface of the casing 47. However, as shown in the second embodiment, the suction port 57 and the discharge port 59 correspond to the casing 47. It is desirable that the entirety of one side surface be open from the viewpoint of improving the blowing efficiency.

A spiral chamber 63 is attached to the bottom wall 49 in the casing 47 so as to form a space in which the upper portion becomes the suction chamber 61. The spiral chamber 63 is connected to the inside of the spiral chamber 63 on the right side in FIG. The inside of the casing 47 is configured to form a discharge chamber 65. The upper part in the casing 47 may be the discharge chamber 65, and the lower part may be the suction chamber 61. That is, the spiral chamber 63 may be configured to be attached to the wall surface of the ceiling plate 55.

3 and 4, the left suction port side of the swirl chamber 63 is formed in a curved shape of the convex outer surface 67, and the air flowing into the suction chamber 61 is blown by an arrow B in FIG. 3 or FIG. As shown in (2), it is configured to have a smooth curved shape so as to flow along the curved convex outer surface 67 of the spiral chamber 63 smoothly in order to reduce energy loss.

3 and 4, the oblique plate 69 is formed between the spiral chamber 63 and the ceiling plate 55 so as to separate the upper suction chamber 61 and the lower discharge chamber 65 from the right discharge port side in FIGS. The discharge chamber 65 is inclined in a direction to gradually expand the discharge chamber 65 toward the discharge port side. Further, as shown in FIG. 6, the open state of the spiral chamber 63 on the discharge port side is cut out so that the airflow in the spiral chamber 63 is efficiently discharged.

At a position eccentric near the center of the upper part of the spiral chamber 63 in FIG. 4, an impeller 25 with a motor is placed in the spiral chamber 63 in the same manner as the partition plate 5 of the first embodiment described above. An insertion hole 71 through which a portion of the impeller 25 can be inserted for mounting is provided.

The impeller 25 of the second embodiment is the same as the impeller 25 of the first embodiment, and a detailed description will be omitted. The impeller 25 is mounted so as to rotate in the spiral chamber 63 as shown in FIGS.

The suction chamber 6 is provided above the spiral chamber 63.
A bolt BT is provided above the spiral chamber 63 so that an air guide plate 75 provided with a suction hole 73 for guiding the air of No. 1 into the central portion of the impeller 25 projects inside the insertion hole 71. It is configured to be fixed. Therefore, as shown in FIG. 5, a substantially semicircular cutout 77 is formed in the above-described oblique plate 69 so that the air guide plate 75 is attached to the upper surface of the spiral chamber 63. A partition 79 is provided between the notch 77 and the upper surface of the spiral chamber 63. In addition, as shown in FIG. 3, the portion of the suction hole 73 is curved so that air flows smoothly.

On the upper part of the air guide plate 75, the motor 23 of the impeller 25 with a motor is provided with a plurality of (four in this embodiment) columns 81 such as bolts, a motor support member 83, a bracket 85, A cushioning material 87 such as rubber provided between the motor support member 83 and the bracket 85
It is attached by. Therefore, the vibration during rotation of the motor 23 is reduced by the buffer material 87, which contributes to suppressing noise.

The above-mentioned assembling procedure is as follows. The impeller 25 with the motor attached to the air guide plate 75 is inserted from the side of the suction chamber 61 into the insertion hole 7 as shown in FIGS.
After the air guide plate 75 is inserted into the spiral chamber 63 through 1, the air guide plate 75 is fixed to the upper part of the spiral chamber 63 by bolts BT.

With the above configuration, when the impeller 25 is rotated by the rotation of the motor 23, the outside air (air) is supplied from the left side to the suction port 5 as shown by the arrow A in FIGS.
7, the air flows into the suction chamber 61, and the air in the suction chamber 61 is moved upward and downward in FIG. 4 along the curved convex outer surface 67 of the spiral chamber 63 as shown by the arrow B in FIG. 3 or FIG. In FIG. 5, the spiral chamber 63 is divided into
From the suction hole 73 along the curved convex upper surface of the impeller 25.
It is evenly distributed in the center of the tube and sucked in so that it flows smoothly.

As described above, the suction chamber 61 formed by the inner surface of the casing 47 and the curved convex outer surface 67 of the spiral chamber 63.
Has the effect of smoothly accelerating the air and at the same time dispersing and uniformizing the airflow flowing into the impeller 25.

The air accelerated by flowing from the suction port 57 on the curved convex outer surface 67 of the swirl chamber 63 is supplied to the suction chamber 61.
3 and 4 of FIG. A part of the air reaches the oblique plate 69, but is guided to the center of the upper part of the spiral chamber 63 as shown by the arrow C in FIGS. However, in the case of the centrifugal blower 1 of the first embodiment, a negative pressure causing a large loss may be generated on the opposite side of the suction port 19, but in the case of the centrifugal blower 45 of the second embodiment, the above negative pressure is generated. The air flows into the impeller 25 from the suction hole 73 of the air guide plate 75 without generating pressure. Therefore, uniform inflow of the airflow is performed over the entire circumference of the impeller 25.

The air pumped outward by the centrifugal force of the rotation of the impeller 25 forms a spiral chamber 63 having an ideal expansion rate.
And the pressure of the air is recovered, and the air is further decelerated when flowing through the discharge chamber 65 gradually expanded by the oblique plate 69, and the air is recovered by the arrow D in FIGS.
The liquid is discharged from the discharge port 59 to the right as shown by.

As described above, in the centrifugal blower 45 of the second embodiment, since the suction direction and the discharge direction of the air become linear, the centrifugal blower 45 is connected to the suction duct connected to the suction port 57 and the discharge port 59. Since the discharge duct has a simple piping structure, and is thin, lightweight, simple and inexpensive, it is suitable for installation in a narrow place. Moreover, the airflow is more smoothly accelerated from the suction port 57 in the suction chamber 61 than in the centrifugal blower 1 of the first embodiment, and the impeller 2
5, and smooth deceleration is obtained from the discharge chamber 65 toward the discharge port 59, so that energy loss is minimized, and high efficiency, low noise, and thinness are achieved.

Further, even if the impeller 25 is thin, the diameter of the impeller 25 can be made relatively large due to its structure, so that a high static pressure can be obtained.

Referring to FIG. 6 and FIG.
In each of the centrifugal blower 1 of the embodiment and the centrifugal blower 45 of the second embodiment, the casings 3, 4
Since 7 has a simple rectangular parallelepiped outer shape, a sound-absorbing blower can be formed extremely easily only by lining the sound absorbing panel material 89 on the inner wall surfaces of the casings 3 and 47. Moreover,
Compared with the conventional method of separately manufacturing a sound deadening box and incorporating it into a blower, the sound deadening method according to the present embodiment has the advantages that it can be manufactured at a minimum cost and that resistance loss hardly increases.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes.

[0053]

As will be understood from the above description of the embodiments of the present invention, according to the first aspect of the present invention, since the air suction direction and the discharge direction are substantially linear, it is possible to connect the air to the suction port. Since the piping structure of the suction duct to be connected and the discharge duct connected to the discharge port can be simplified, the cost is reduced. Further, since it is thin, lightweight, simple in structure and inexpensive, it can be easily installed in a narrow place.

According to the second aspect of the present invention, since the air suction direction and the discharge direction are reliably linear, the piping structure of the suction duct connected to the suction port and the discharge duct connected to the discharge port can be simplified. Cost can be reduced. Further, since it is thin, lightweight, simple in structure and inexpensive, it can be easily installed in a narrow place. Moreover, compared to the centrifugal blower according to claim 1, the airflow can be smoothly accelerated in the suction chamber from the suction port, can flow into the impeller in a uniform state, and a smooth deceleration can be obtained from the discharge chamber toward the discharge port. Therefore, energy loss can be minimized, and high efficiency, low noise, and thinness can be achieved.

According to the third aspect of the present invention, the simple external shape of the rectangular parallelepiped included in the casing can be reduced very easily by simply lining the sound absorbing panel material on the inner wall surface of the casing, thereby reducing the noise. Moreover, the resistance loss hardly increases at the minimum cost.

[Brief description of the drawings]

FIG. 1 is a front view of a centrifugal blower according to a first embodiment of the present invention.

FIG. 2 is a plan view of the centrifugal blower according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG. 4;

FIG. 4 is a plan view of a centrifugal blower according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a centrifugal blower according to a second embodiment of the present invention, with a ceiling plate removed.

FIG. 6 is a perspective view of a centrifugal blower according to a second embodiment of the present invention as viewed from a discharge port side.

FIG. 7 is a plan view of a centrifugal blower according to a second embodiment of the present invention, in which a sound absorbing panel material is lined inside a side wall of a casing.

FIG. 8 is a sectional view of a centrifugal blower according to a second embodiment of the present invention, in which a sound absorbing panel material is lined inside a ceiling plate and a bottom plate of a casing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Centrifugal blower (of 1st Embodiment) 45 Centrifugal blower (of 2nd Embodiment) 3,47 Casing 5 Partition plate 7,61 Suction chamber 9,65 Discharge chamber 13,55 Ceiling plate 15 Bottom plate 17 Side plate 19, 57 Suction port 21, 59 Discharge port 23 Motor 25 Impeller 39, 73 Suction hole 41, 75 Air guide plate 63 Swirl chamber 67 Convex outer surface 69 Diagonal plate 87 Buffer material 89 Sound absorbing panel material

Claims (3)

[Claims] 1. A partition having a rectangular box-shaped cross section, which is vertically divided into two parts, one of which is formed as a suction chamber and the other is formed as a discharge chamber, and one of the suction chambers adjacent to the partition plate is provided. A suction port for sucking air is provided on a side surface side, and a discharge port for discharging air is provided on one side surface of the discharge chamber adjacent to the partition plate and located substantially opposite to the suction port. A suction hole communicating the suction chamber and the discharge chamber is provided at substantially the center of the suction chamber, and an impeller that sucks air from the suction chamber from the suction hole and generates an airflow toward the discharge port through the discharge chamber is provided in the discharge chamber. A centrifugal blower, wherein a rotary drive means for rotating the impeller is provided in the suction chamber. 2. A casing having a box shape with a rectangular cross section is provided with a suction port for sucking air on one side face and a discharge port for discharging air on the other side face of the casing. A spiral chamber forming a suction chamber communicating with the suction port and forming a discharge chamber communicating the other with the discharge port is provided in the casing, and the suction port side of the spiral chamber is provided with a curved convex outer surface. An oblique plate that is inclined in a direction to gradually expand the discharge chamber toward the discharge port side between the spiral chamber and the upper surface or the lower surface of the casing so as to partition the discharge chamber and the suction chamber on the discharge port side of the spiral chamber. A suction hole communicating with the suction chamber is provided substantially at the center of the spiral chamber, and an impeller for sucking air from the suction chamber through the suction hole and generating an airflow toward the discharge port is provided in the spiral chamber. A centrifugal blower, wherein a rotary drive means for rotating the impeller is provided in the suction chamber. 3. The centrifugal blower according to claim 1, wherein a sound absorbing panel material is lined on an inner wall surface of the casing.