JPH0249997A - Multiple blade centrifugal blower - Google Patents

Abstract

PURPOSE:To miniaturize a multiple blade centrifugal blower dividing a flow passage for discharged air into two part and by discharging the divided air streams only in one direction within a casing in which the multiple blade centrifugal blower and a drive motor. CONSTITUTION:A motor 17 located above a support plate 18 in a casing 5 drives a multiple blade centrifugal blower 15 located below the motor 17. The blower 15 sucks up air which has been introduced from a ventilating port 6 and through condenser 9 and a heat radiating chamber 10 so as to be cooled, through an axial suction port 15, and discharges circumferentially. A pair of reed pieces 20, 21 are projected in parallel with the axis of the blower 15 at opposite positions in the casing 5 so as to divide discharged air into two parts one of which is fed straight forward so as to be discharged from a ventilating port 7 and the other one of which is turned in its direction around the support plate 18 and is then discharged from a passage port 7' in the same direction as that of the ventilating port 7. Thereby it is possible to miniaturize the casing.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a multi-blade centrifugal blower that can be made smaller and lighter by making the width of the casing as close as possible to the outer diameter of the fan. .

(Prior Art) A multi-blade centrifugal blower is generally used as a blower installed in an outdoor unit for an air conditioner, and as shown in FIG. 3 arranged in the circumferential direction is rotatably housed,
Air is sucked in from the axial direction of the fan 4 and transferred to the blades 3.
The centrifugal force of the gas was used to eject it in the circumferential direction and blow it out to the outside.

However, in this conventional blower, due to the structure in which the outside roll l of the fan 4 is provided, the width Wu of the casing 2 is approximately 1.5 to 1.7 times the outer diameter Du of the fan 4, which is proportional to the amount of air blown. In general, there was a dislike of becoming large.

Therefore, as a result, a blower with a relatively insufficient air volume is installed within the machine frame of a given width, and in order to secure the given air volume, the rotation speed must be increased, which reduces power and noise. There was a growing problem.

(Problem to be Solved by the Invention) Therefore, as a solution to the above-mentioned problem, a method can be considered in which a plurality of discharge ports are provided in the casing to increase the amount of air blown.

For example, such a method is shown in Japanese Utility Model Application Publications No. 52-31907 and No. 59-18214.

In other words, in these publications, the inlet of a centrifugal cuff is divided into two by a partition plate, and the same number of outlet ports are provided corresponding to these inlets to blow air in opposite directions. A blower is shown in which the scroll of the casing is divided into two parts, and air is blown in the same direction from three locations on the left and right sides of the inlet.

However, since all of these methods have scrolls on the sides of the fan, the casing width is the same as before, making it difficult to downsize the casing, and since no special cooling means are provided for the fan motor, overheating may occur. There were problems such as shortening of the lifespan due to aging.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a multi-blade centrifugal blower that has a simple configuration, is small and lightweight, and allows a fan motor to be used in good condition.

(Means for Solving the Problems) Therefore, the multi-blade centrifugal blower of the present invention houses a fan having a plurality of blades and a motor for driving the fan in a casing, and draws air into the fan. In a multi-blade centrifugal blower that discharges air in the circumferential direction using centrifugal force and blows it out to the outside of the casing, the flow path of the discharged air divided by the casing is divided into two by the fan, and each movement of the air is divided into two. By connecting one end of the flow path to the outlet on the same side and arranging the other end on the same axis, the discharged air can be blown out in the same direction, and the width of the casing can be adjusted as much as possible to the outside diameter of the fan. The present invention is characterized in that the motor can be brought close to the motor to reduce its size and weight, and that the motor is cooled by being housed in one of the movement channels.

(Example) Hereinafter, an illustrated example in which the present invention is applied to a blower of an outdoor unit for an air conditioner will be described. In FIGS. 1 and 2, 5 is a vertically long box-shaped housing installed outdoors; It also serves as a casing for a blower, which will be described later, and a plurality of ventilation holes 6.7 are provided on the lower side of the casing, except for the middle and high portions.

A compressor 8 connected to a cooling unit (not shown) as an indoor unit installed indoors is housed in the inner lower part of the housing 5, and a condenser 9 is connected to the high-pressure side of the compressor 8. A heat radiation chamber 10 is provided directly above the capacitor 9, and a partition plate 12 is provided above the heat radiation chamber 10 to partition the chamber 10 and the ventilation chamber 11.

Inside the ventilation chamber 11, there is provided a flow path for discharging air, which will be described later.This flow path is divided into two parts by a fan, which will be described later. The ends are coaxial with each other with the fan in between. A through hole 13 is formed in the partition plate 12, and the hole 13
A fan 15 of the blower 14 is disposed directly above the opening.

The blower 14 includes a fan 15 having a large number of blades 16 arranged circumferentially, and a motor 17 for driving the fan 15, which is installed on a support plate 18.

The support plate 18 is arranged in the middle and high part of the ventilation chamber 11, and divides the discharge air movement flow path into upper and lower parts through the support plate 18, and rotatably supports the fan 15 in the lower movement flow path. Further, the driving motor 17 is housed in the upper moving passage. Further, as shown in the figure, the support plate 18 is formed to be shorter than the depth of the housing 5, and the rear end and the housing 5
A ventilation port 19 is formed between the fan 15 and the back surface of the fan 15, and communicates with the discharge air movement flow path extending rearward from the fan 15.

In the figure, reference numerals 20 and 21 denote ventilation partition tongues made of metal or synthetic resin that protrude from the inner walls of the opposing casings 5, and are formed into a substantially triangular cross-sectional shape as shown in the figure. They are arranged close to the circumferential surface of the fan 15, and their positions are spaced apart in the same direction from the diametrical position of the fan 15, as shown in FIG. 22 is an accumulator connected to the low pressure side of the compressor 8 for gas-liquid separation.

(Function) The multi-blade centrifugal blower configured as described above is attached via the support plate 18 inside the housing 5 which also serves as a casing.
A ventilation chamber 11 partitioned by an inner wall of the housing 5 surrounding the fan 15 is provided with a ventilation chamber 11 in the upper part of the housing 5 surrounding the fan 15.
It is constructed by attaching tongue pieces 20 and 21 at substantially opposite positions on the inner walls sandwiching the tongues 20 and 5. In this case, the tongue pieces 20 and 21 are made of the same metal plate or synthetic resin as the housing 5, and
If it is integrally molded, the structure will be even simpler.

Therefore, since there is no scroll around the fan 15 as in the conventional case, the structure and manufacture of the casing are made easier. This allows the casing to be made smaller or have a narrower structure.

In the case of the above embodiment, the width W of the casing is the fan 15
As mentioned above, this ratio is approximately 1.2 times the outer diameter of the fan.
This means that the size of the casing can be significantly reduced compared to the case that required 1.7 times the size of the casing. This is done without reducing the air blowing capacity,
Due to the above-mentioned downsizing, the blower 14 will not have insufficient air volume.

In the outdoor unit in which the blower 14 configured as described above is installed in the upper part of the housing 5, when this is driven simultaneously with the operation of the air conditioner, the compressor 8 is driven via a motor (not shown), and the high-temperature and high-pressure refrigerant is is sent to the condenser 10, and the fan 15 is rotated by the drive of the motor 17.

When the fan 15 rotates in this manner, the housing 5 is
The air to be cooled is taken in, passes through the condenser 9, cools the high-temperature refrigerant, and at the same time absorbs heat and is heated.As shown in FIG.
Inhaled within 5 days.

The air is stirred by the blades 16 within the fan 15, and is discharged to the outside of the fan 15 through the gaps between the blades 16 due to the centrifugal force received at this time. At that time, the discharged air is
1 in two directions, and move in opposite directions as shown by the arrows in FIG.

Among them, one of the discharged air moves forward and flows out from the ventilation lower, and the other discharged air moves backward and is guided to the ventilation opening 19, moves to the upper space of the ventilation chamber 11, and flows into the upper space of the ventilation chamber 11. The space is moved in the same direction as the air and flows outward from the ventilation lower, cooling the motor 17 in the process of this movement.

In this way, after the air is divided into two directions, one of the airflows is detoured and discharged from separate outlets, so compared to the conventional method where the air flows out from a single outlet, each movement The length of the discharge path and the amount of discharged air in the flow path are reduced.

Therefore, these act as reaction forces of the centrifugal force on the fan 15.
The effect of trying to reverse the flow rate is reduced, and furthermore, the discharged air moves through a wide discharge path with the same width W as the casing 5, and its flow resistance is suppressed, thereby reducing the burden on the motor 17. be done.

(Effects of the Invention) As described above, the multi-blade centrifugal blower of the present invention houses a fan having a plurality of blades and a motor for driving the fan in a casing, and centrifugally blows the air sucked into the fan. In a multi-blade centrifugal blower that uses force to discharge air in the circumferential direction and blow it out to the outside of the casing, the discharge air flow path divided by the casing is divided into two by the fan, and each flow path is divided into two. Because one end was connected to the air outlet on the same side,
The discharged air can be blown out in the same direction.

Further, in the present invention, since the other end of the discharge air movement flow path is arranged coaxially, the width of the casing can be made as close as possible to the outer diameter of the fan, and by doing so,
This has the effect of making this type of blower smaller and lighter.

Furthermore, in the present invention, since the motor is accommodated in one of the moving channels, the motor can be cooled using the discharged air, and the motor can be used in good condition.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
A cross-sectional view taken along the line A--A in the figure, and FIG. 3 are explanatory diagrams showing main parts of a conventional example. 5...Casing, 15...-Fan 16...Blade, 17...Motor

Claims (1)

[Claims] A fan with a plurality of blades and a motor for driving the fan are housed in a casing, and the air sucked into the fan is discharged in the circumferential direction by centrifugal force, and then blown out to the outside of the casing. In a multi-blade centrifugal blower, the discharge air movement path divided by the casing is divided into two by the fan, one end of each movement path is communicated with the air outlet on the same side, and the other end is coaxially connected. A multi-blade centrifugal blower characterized in that the motor is housed in one of the moving channels.