JPH0450476Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air processing device applied to, for example, an outdoor unit of an air conditioner.

[Conventional technology]

The outdoor unit of an air conditioner is generally installed in contact with the wall of a building. Therefore, one-sided air treatment is ideal, and the above ideal can be achieved if air is sucked in from the center of the front of the main body and exhausted in the front direction on the annular outside of the sucked air.

FIG. 3 is a cross-sectional view showing the internal structure of an air processing device (for example, an outdoor unit of an air conditioner) that can process both intake and exhaust air from one side. A heat exchanger 23 is provided for exchanging heat between the air sucked in from the air intake port 22 formed in the center and the refrigerant, and the air from the heat exchanger 23 is transferred to the air intake port 22.
An exhaust fan 24 that exhausts air to an air exhaust port 30 formed around the heat exchanger 23 is disposed on the rear side of the heat exchanger 23.

This exhaust fan 24 has a small diameter side connected to a heat exchanger 23.
a conical hub 25 facing the hub 2;
The hub 25 includes a plurality of blades 26 attached to the outer periphery of the motor 28.
7 are connected.

Therefore, the air sucked into the main body 21 from the air intake port 22 exchanges heat with the refrigerant in the heat exchanger 23, and then enters the exhaust fan 24, where the speed is increased.
Then, the air whose speed has been increased by the exhaust fan 24 changes its flow direction toward the rear wall 21a of the main body 21.
The air is discharged from the air outlet 30 through an exhaust passage 29 formed between the side wall of the main body 21 and the heat exchanger 23 .

[Problem that the invention attempts to solve]

By the way, in such an air treatment device, in order to change the direction of flow of air exiting the heat exchanger 23 to the front direction of the main body 21 after being accelerated by the exhaust fan 24, the rear wall 21a side of the main body 21 is There was a problem in that the pressure loss of the air flow at the exhaust fan 24 increased, and the load on the motor 28 that drove the exhaust fan 24 increased.

This invention was developed in view of the above problems, and its purpose is to reduce the pressure loss of the exhaust air on the rear wall side of the main body, and to direct the air from the heat exchanger to the air intake port. An object of the present invention is to provide an air processing device that can reduce the load on a motor that drives a fan that exhausts air to an air exhaust port formed around it.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a mixed flow fan comprising a conical hub open at both ends, a number of vanes attached to the outer surface of the hub, and a means for rotating the hub. The mixed flow fan is positioned on the air discharge side of a heat exchanger so that air discharged from the heat exchanger flows into the hub through the large diameter opening of the hub, and a wall is provided on both sides of the hub on the air discharge side of the heat exchanger so that air flowing out of the small diameter opening of the hub makes a U-turn and is pressurized by the multiple vanes.

[Effect]

In this invention, an air flow path is formed in the hub of the mixed flow fan installed at the rear of the heat exchanger, and the air from the heat exchanger passes through the hub and flows out to the rear wall of the main body. Pressure loss on the rear wall side of the main body can be reduced by increasing the pressure of the air flowing out to the rear wall side using a mixed flow fan and discharging it from the air outlet formed on the front side of the main body. .

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In Fig. 1, numeral 3 indicates the main body of an air processing device (for example, an outdoor unit of an air conditioner). A heat exchanger 1 for exchanging heat is provided, and a mixed flow fan (exhaust fan) 2 for exhausting air from the heat exchanger 1 to an air outlet 12 formed around an air intake port 11 is provided for exchanging heat. It is arranged on the rear side of the container 1.

This mixed flow fan 2 includes a hollow conical hub 4 whose large diameter side faces the heat exchanger 1, a plurality of blades 5 attached to the outer periphery of the hub 4, and these blades 5 together with the hub 4. A rotation boss 10 to be rotated;
The rotary boss 10 is formed of a plurality of girders 9 (see FIG. 2) that support the rotation boss 10 at the center of the hub 4. An air flow path 8 is formed to flow out to the side 3a. Note that the rotating shaft 6 of the motor 7 is connected to the rotating boss 10 of the mixed flow fan 2 .

In such a configuration, air sucked into the main body 3 from the air intake port 11 undergoes heat exchange with the heat exchanger 1 and then flows into the hub 4 of the mixed flow fan 2.
The air that has flowed into the hub 4 passes through the air passage 8 formed within the hub 4 and passes through the rear wall portion 3 of the main body 3.
It flows out to side a, where the flow direction is changed to the front direction of main body 3 and then enters mixed flow fan 2. and,
The air flowing into the mixed flow fan 2 is accelerated by the rotation of the blades 5, and is discharged from the air outlet 12 through the exhaust passage 13 formed between the side wall of the main body 3 and the heat exchanger 1. be done.

In this way, in one embodiment of the present invention, the heat exchanger 1
A mixed flow fan 2 is disposed on the rear side, and an air passage 8 is formed in the hub 4 of the mixed flow fan 2 to allow air from the heat exchanger 1 to flow toward the rear wall 3a side of the main body 3. This allows the flow direction of the air from the heat exchanger 1 to be changed before the air is sped up by the mixed flow fan 2. Therefore, the air taken in from the air intake port 11 formed at the center of the front of the main body 3 is transferred to the air intake port 11.
When exhausting air from the air outlet 12 formed around the motor 7, the pressure loss of the air flow on the rear wall 31a side of the main body 3 can be reduced.
The load can be reduced.

That is, since the pressure loss of the air flow in the pipe is proportional to the square of the velocity, for example, the flow velocity of the air flow F2 before entering the mixed flow fan 2 is expressed as Va (=1 to
2m/s) and the absolute flow velocity of the air flow F3 after exiting the mixed flow fan 2 is C ₂ (=10 to 30m/s),
In the case of this embodiment, the pressure loss of the air flow generated on the rear wall portion 31a side of the main body 3 is proportional to the square of Va. On the other hand, in the case of the conventional example shown in FIG. 3, the flow velocity of the air flow before entering the exhaust fan 24 is
Va′ (=1 to 2 m/s), and the absolute velocity of the air flow after exiting the exhaust fan 24 is C ₂ ′ (=10 to 30 m/s).
m/s), the friction loss of the air flow generated on the rear wall portion 21a side of the main body 21 is proportional to the square of C ₂ '. Therefore, when _this embodiment is compared with the conventional example shown in ^FIG . The pressure loss of the air flow on the part 3a side is reduced.

Note that the girder 9 that supports the rotation boss 10 at the center of the hub 4 is attached to the hub 4 with a large flow passage cross-sectional area as much as possible.
Although it is preferable to attach it to the bottom of the hub 4, it may be fixed at any position as long as it is as close as possible to the bottom of the hub 4.

[Effect of idea]

As explained above, according to the present invention, a mixed flow fan having a hollow hub is arranged at the rear of the heat exchanger that exchanges heat with the refrigerant by sucking air from the air intake port formed at the front center of the main body. By doing so,
The exhaust air from the heat exchanger can be passed through the hub of the mixed flow fan and flowed out to the rear wall side of the main body. Therefore, when the exhaust air from the heat exchanger is changed in flow direction on the rear wall side of the main body and discharged from the air exhaust port formed around the air intake port, the exhaust air from the heat exchanger changes its flow direction. We provide an air treatment device that can reduce the pressure loss of the exhaust air on the rear wall side of the main body and reduce the load on the motor that drives the fan, since the direction of the air is changed and then the pressure is increased by the mixed flow fan. can.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the internal structure of an air processing device showing an embodiment of the present invention, Fig. 2 is a perspective view of a mixed flow fan used in the air processing device shown in Fig. 1, and Fig. 3 1 is a diagram showing a conventional example. 1... Heat exchanger, 2... Mixed flow fan, 3... Main body, 4... Hub, 5... Vane, 6... Rotating shaft, 7
...Motor, 8...Air flow path.

Claims (1)

[Scope of utility model registration request] A mixed flow fan comprising a conical hub with open ends, a plurality of blades attached to the outer peripheral surface of the hub, and means for rotationally driving the hub is mounted on the air discharge side of the heat exchanger. The heat exchanger is arranged so that the air discharged from the hub flows into the hub from the large-diameter opening of the hub, and the air that flows from the small-diameter opening of the hub makes a U-turn and connects the plurality of blades. 1. An air treatment device, characterized in that a wall portion is provided on the air discharge side of the heat exchanger across the hub so that the air pressure is increased by .