JPH06193900A - Room machine of air conditioner - Google Patents

Abstract

PURPOSE:To ensure a smooth flow field free from counterflow and vortexes of wind and an efficient operation with low noises by providing a louver of a variable blowing angle at an outlet for a fan in a room machine and providing means for adapted for interlocking with the louver to change an air passage in the room machine. CONSTITUTION:A front casing 9 of an indoor machine is provided at upper and front faces with suction openings 4, and a heat exchanger 1 is provided between the suction opening 4 and an room fan 2. The front casing 9 is provided at its inward extension with a front nose 8, and a louver 3 is provided at an outlet 5 on a lower face of the front casing 9 to be positioned in parallel to the room fan 2. Provided on a rear casing 7 is a back nose 6 which is positioned in parallel to the indoor fan 2. The back nose 6 and the front casing 9 are moved so that a vortexes generated near the front nose 8 are moved toward the front casing 9. Thus it is possible to achieve a smooth flow field free from counterflow and an efficient operation with low noises.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor unit of a split type air conditioner.

[0002]

2. Description of the Related Art FIG. 6 shows a structural diagram of an indoor unit of a wall-mounted heat pump air conditioner or an air conditioner exclusively used for cooling which is usually used. This indoor unit is composed of a front casing 29 at the front part and a rear casing 27 at the rear part, and an indoor blower 22 is provided in the left and right direction inside thereof. A suction port 24 for taking in indoor air into the indoor unit is provided at an upper portion and a front surface portion of the front casing 29, and a heat exchanger 21 is provided between the suction port 24 and the indoor blower 22. The front casing 2
9 and the rear casing 27. The air outlet 25 is located at a lower portion between the rear casing 27 and the air outlet 25, and the louver 23 extends to the air outlet 25 in parallel to the indoor blower 22. It can be installed near the ceiling, such as on a window.

Next, the operation of the above configuration will be described. During cooling, as shown in FIG. 7, the louver 23 is set slightly downward from the horizontal direction, and the louver 23 is operated so as to blow out cool air. Even if the cold air from the wall-mounted air conditioner blows out near the horizontal, the cold air does not stay near the ceiling due to the buoyancy, but the warm air that is blown out horizontally during heating stays near the ceiling and the floor surface where the user is I can't heat nearby.

Therefore, in the case of operating with a high air flow rate in order to initially start up and heat the entire room during heating, the angle of the louver 23 is set to about 45 ° with respect to the vertically downward direction (see FIG. 6). However, when the airflow blown out from the air conditioner directly hits the user, it is often uncomfortable, and in order to prevent it, the louver 23 is controlled so as to be set vertically downward (see FIG. 8) to operate. To move the louver 23, a stepping motor (not shown) is usually used.

As the blower, an indoor blower 22 (also called a cross flow fan) is usually used as shown in FIG. The flow created by the indoor blower 22 is closely related to the shape of the fan such as the inflow and outflow angles of the fan, the shape of the fan itself such as the number of revolutions and the radius, and the shape of the indoor unit such as the shape of the casing and the position of the heat exchanger 21. There is. In order to operate efficiently as an air conditioner, it is desirable to output as much air as possible and operate, and noise, which is an important factor for user comfort, is the largest at high airflow. The shape of the indoor unit is often designed in consideration of operating the indoor blower 22 with a high air volume. At that time, the set angle of the louver 23 is set near the horizontal for the purpose of reducing the pressure loss as much as possible in relation to the setting during actual operation. FIG. 9 shows an example of the appearance of the flow field in the indoor unit when the louver 23 is set near the horizontal direction.

In the above air conditioner, when blown out at an angle close to the vertical downward direction which is often set during heating operation,
Since the pressure resistance of the blowout flow path becomes large, a swirl may occur near the rear casing 27 in the suction region of the indoor blower 22 as shown in FIG. 10, and a backflow may occur. As a result, since the suction flow path of the indoor blower 22 becomes smaller and the pressure loss becomes larger, the blown air amount is reduced by about 20% at the same rotation speed as compared with the case where the blower is made near the horizontal direction as shown in FIG. There were times when it was not possible to heat close enough to the floor.

[0007]

In the above air conditioner, when the air is blown out at an angle close to the vertical downward direction which is often set during heating operation, there is a problem that a vortex is generated near the rear casing and a back flow is generated. It was Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks and prevent backflow due to generation of vortices.

[0008]

In order to achieve the above object, in the present invention, an air outlet provided in an indoor unit, an indoor blower, and an louver having an adjustable angle provided in the air outlet.
And a flow path changing means for changing the air flow path of the indoor unit in conjunction with the louver.

[0009]

With the above-mentioned structure, the air flow passage is changed by moving the flow passage changing means in accordance with the louver setting position set corresponding to operating conditions such as heating and cooling. By doing so, it is possible to prevent backflow around the indoor blower inside the indoor unit, and to perform air-conditioning operation more efficiently and with lower noise under a wide range of operating conditions.

[0010]

Embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2 are structural views of an indoor unit of an air conditioner according to the present invention. In the figure, an indoor blower 2 extends to the left and right inside the indoor unit, and a front casing 9 constituting the front part of the indoor unit has a suction port 4, a suction port 4, and the indoor blower 2 at upper and front portions. A heat exchanger 1 is provided between them, a front nose 8 is provided in a portion of the front casing 9 that extends inside the indoor unit, and a blower outlet 5 provided at a lower portion has a position parallel to the indoor blower 2. The louver 3 on the left extends to the left and right. A rear nose 6, which is a first flow path changing unit, extends in the left-right direction in a position parallel to the indoor blower 2 in a rear casing 7 that constitutes a rear portion on the wall side of the indoor unit.

FIG. 1 shows the shape of the rear casing 7 of the indoor unit and the appearance of the flow field when the louver 3 is set to a position near horizontal, that is, at the time of the initial rise of normal cooling operation or heating operation. In this case, since the back nose 6 is in a closed state and has almost the same form as the conventional indoor unit, the flow field in the indoor unit does not show vortices in the flow path system as shown in FIG. It is flowing smoothly.

Next, FIG. 2 shows a case where the louver 3 is set to a condition close to vertically downward. In this case, the back nose 6 is open. As a result, the vortex appearing along with the backflow seen near the beginning of winding of the rear casing 7 disappears in the suction area at the upper part of the indoor blower 2 as shown in FIG. 10, and in this case also, in a smooth state. Flowing. That is, when the louver 3 is set vertically downward, in the present invention, the back casing 6 is moved to the rear casing 7 and set in the open state, and the upper portion of the indoor blower 2 of the rear casing 7 where the conventional backflow vortex is seen is set. By newly installing the back nose 6 nearby, the backflowing wind will flow to the blowing side, and the eccentric vortex will also stay near the back nose 6, realizing a smooth flow field as shown in Fig. 7. can do.

In addition, warm air is blown out by the indoor blower 2 in an oblique direction along the blowout flow path of the casing, which also has the effect of inertia, and even if the louver 3 is set vertically downward as shown in FIG. In this case, the warm air blown out from the indoor unit is inclined by about 10 °. During heating operation,
In order to improve the user's comfort, it may be desirable to blow vertically downward so that the user indirectly heats the air without directly applying the airflow. Therefore, it is conceivable to set the louver 3 so that the louver 3 is directed downward from the vertical direction toward the indoor installation wall. However, when operating with the shape of the conventional rear casing 7, the indoor unit is increased by the pressure loss. The backflow region generated in the internal flow becomes large and the flow rate decreases by about 50%. Even in such a case, according to the present invention, by further increasing the projection amount of the back nose 6 of the rear casing 7, it is possible to blow out in the vertically downward direction.

As a means for specifically driving the back nose 6, it is conceivable to operate the drive shaft 10 by using a stepping motor (not shown) as shown in FIG. Further, the drive shaft 11 of the front nose 8 which is the second flow path changing means can also be considered in the same manner as the above configuration.

The operation of the above structure will be described as follows.
By moving the back nose 6 or the front nose 8 it is possible to move the vortices formed in the vicinity of the front nose 8 from the front casing 9 so that there is no backflow as in FIGS. 2 and 4. It is possible to provide a flow field in an indoor unit and an indoor unit that can be operated efficiently and with low noise. As a modification, the same effect can be obtained by narrowing the flow passage area of the suction port 4.

In this embodiment, the back nose 6 is described as being movable in the closed state and the open state, but it may be finely moved stepwise according to the set angle of the louver 3 in the previous embodiment. Similarly to the above, it is possible to realize a smooth flow field in the indoor unit, and it is possible to provide an indoor unit that can be operated efficiently and with low noise.

[0017]

As described above, according to the present invention,
By changing the flow path according to the setting angle of the louver 3 that is needed to comfortably cool and heat the room, it is possible to realize a smooth flow field without wind backflow and vortices, and operate more efficiently and with less noise. You can get the effect that you can.

[Brief description of drawings]

FIG. 1 is a diagram showing the shape and internal flow of an indoor unit when a louver according to the present invention is set near horizontal.

FIG. 2 is a diagram showing a state of an open back nose and an aspect of an internal flow when the louver according to the present invention is set near vertically downward.

FIG. 3 is a configuration diagram of a back casing.

FIG. 4 is a diagram showing a movable state of the front nose and aspects of internal flow when the louver according to the present invention is set to be vertically downward.

FIG. 5 is a configuration diagram of a front casing.

FIG. 6 is a structural diagram of a conventional indoor unit.

FIG. 7 is a diagram showing an example of standard setting positions of louvers during cooling operation.

FIG. 8 is a diagram showing an example of standard setting positions of louvers during heating operation.

FIG. 9 is a diagram showing an example of a conventional internal unit internal flow during a cooling operation.

FIG. 10 is a diagram showing an example of a conventional internal unit internal flow during heating operation.

[Explanation of symbols]

2 ... indoor blower, 3 ... louver, 5 ... outlet, 6 ... back nose, 8 ... front nose.

Claims (1)

[Claims] 1. An indoor blower provided in an indoor unit, a blowout port provided in the indoor unit, a louver provided at the blowout port for varying a blowout angle, and an air flow path of the indoor unit linked with the louver. An indoor unit for an air conditioner, which comprises: