JPS62158941A - Indoor unit for air-conditioning machine - Google Patents

Abstract

PURPOSE:To eliminate draft effect upon heating, miniaturize a lower fan and make an airflow path switching damper unnecessary by a method wherein a device for controlling the ventilating capacity of the lower fan is provided in order to prevent the inflow and outflow of air through a lower blow-off port upon cooling. CONSTITUTION:An indoor unit 1 is provided with a suction port 3 as well as a heat exchanger 2 at the central part thereof, an upper blow-off port 5 so as to cope with an upper fan 4 and a lower blow-off port 7 so as to cope with a lower fan 10, however, the same unit 1 is not provided with a damper. The size of the lower fan 10 is made smaller than the same of the upper fan 4. A control device decides whether it is cooling or heating and either one of the output patterns Hi, Me, Lo of the set air speed of the fan is outputted in accordance with the set air speed when the decision is cooking while the ventilation of the indoor unit 1 is effected through only the upper blow-of port 5. When the decision is heating, either one of the output patterns Hi, Me, Lo is outputted in accordance with the set air speed in the same manner while the ventilation of the same is effected through the lower and upper blow-off ports 5, 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an indoor unit of an air conditioner that aims to provide a comfortable indoor environment and reduce costs.

[Conventional technology]

FIGS. 9 and 10 are, for example, Japanese Patent Application Laid-Open No. 54-938.
These are cross-sectional views showing the indoor unit of the conventional air conditioner shown in Publication No. 41 during cooling and heating. In the exchanger, 3 is an air inlet, 4 is an upper blower, 5 is an upper blower, 6 is a lower blower, 7 is a lower blower, 8 is an upper damper, 9 is a lower damper, and 12 is a floor.

The conventional indoor air conditioner 1-1 is configured as described above, and when cooling the room, the lower damper 9 is closed, the upper damper 8 is opened, and the upper blower 4 is operated, as shown in FIG. Air is sucked in through the air suction port 3, cooled by the heat exchanger 2, and cooled air is blown out from the upper blowout port 5.

On the other hand, during heating, as shown in FIG. 10, by closing the upper damper 8, opening the lower damper 9, and operating the lower blower 6, indoor air is sucked through the air suction port 3, and the heat exchanger 2, and hot air is blown out from the lower air outlet 9.

[Problem that the invention seeks to solve]

The indoor unit of the conventional air conditioner described above is configured as described above, so when heating, warm air is blown out from the lower outlet, so the temperature distribution in the room is small, but the air volume is relatively high. The low-temperature wind causes occupants to feel uncomfortable due to the draft feeling, and the upper blower 4 and lower blower 6
There is a problem in that the dampers 8 and 9 need to have almost the same specifications, or that two dampers 8 and 9 are required to switch the air paths during cooling and heating.

This invention was made to solve these problems, and provides an indoor unit for an air conditioner that provides high comfort, allows for a smaller lower blower, and does not require a damper to switch the air path. The purpose is to obtain.

[Means for solving problems]

The indoor unit of the air conditioner according to the present invention has a suction port arranged in the center of the front surface of the main body, an upper blower port corresponding to the upper blower arranged inside, and a lower part arranged below the suction port. A lower blower outlet is arranged corresponding to the blower, and a blower control means is provided which can independently control the blowing capacity of the upper blower and the lower blower.

[Effect]

In this invention, during cooling, the air cooled by the heat exchanger installed opposite the suction port is blown out from the upper air outlet by the upper blower, and the air is prevented from flowing in and out from the lower air outlet. During heating, air heated by the heat exchanger is blown out from the upper and lower air outlets by the upper and lower blowers.

〔Example〕

Hereinafter, embodiments of an indoor unit of an air conditioner according to the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the air blowing state of the indoor unit of the air conditioner according to the present invention during cooling, FIG. 2 is a cross-sectional view thereof, and FIGS.
Portions that are the same as or corresponding to those in the figures will be designated by the same symbols, and their description will be omitted, and the description will mainly focus on parts that are different from those in FIGS. 9 and 10.

As is clear from comparing Figures 1 and 2 with Figures 9 and 10, there is an indoor unit 1, a heat exchanger 2, an air inlet 3, an upper blower 4, an upper outlet 5, a lower The blowout lower is the same as that shown in FIGS. 9 and 10, and the upper damper 8 and lower damper 9 are omitted in this embodiment.

Further, the lower blower 10 is a smaller lower blower than the upper blower 114, and the upper blower 4 is driven by the upper blower fan motor 13, and the lower blower 10 is driven by the lower blower fan motor 14. It has become.

FIG. 3 shows a block diagram of control means for the upper blower fan motor 13 and the lower blower fan motor 14. 18 in FIG. 3 is a microcomputer, C
PU21, memory 20. It has an input circuit 19 and an output circuit 22.

A set wind speed switch 16 and a heating/cooling changeover switch 17 are connected to the input circuit 19 , and respective switch status signals are given to the input circuit 19 .

The fan motor drive circuit 23 sends a specified output to the upper blower fan motor 13 and the lower blower fan motor 14 based on the signal output from the output circuit 22.

Next, the operation of the above embodiment will be explained with reference to FIG. FIG. 4 is a flowchart showing the control specifications of the above embodiment.

First, in step 24, the state of the cooling/heating switch 17 is read by the input circuit 19, and then in step 25, the state of the set air speed switch 16 is read. Next, in step 27, it is determined whether the operating mode is from cooling to heating, and in step 28, the set wind speed is Hi (high speed), Me
(Medium speed) -L.

(low speed). If the operation mode is cooling, in step 28a, when the upper blower 4 blows air at each set wind speed, the output of the lower blower ``0'', which does not allow air to flow in or out from the lower blowout lower, is determined in advance, and in step 29, each The output pattern of the upper blower fan motor 13 and the lower blower fan motor 14 corresponding to the set wind speed is set to one of the set wind speeds Hi (step 29a), Me (step 29b), and Lo (step 29C). By outputting air, air is blown only from the upper air outlet 5 during cooling.

Also, in step 27, if it is heating, step 2
8b to step 30, the output park of the upper blower fan motor 3 and the lower blower fan motor 4 corresponding to each set wind speed Hi (step 30a), Me (step 30b), or Lo (step 30C) is performed. By outputting , air is blown from the upper blower outlet 5 and the lower blower lower during heating.

In the upper embodiment, the output of the lower blower 10 to prevent air from flowing in and out from the lower blowing lower during cooling is determined in accordance with the set wind speed of the upper blower 4. ), a tachometer 15 is added to the upper blower 4 as shown in FIG. 6 (cross-sectional view of FIG. 5), and the signal from the tachometer 15 is sent to the input circuit 19 of the microcomputer 21 as shown in FIG. According to the flowchart shown in FIG. 8, the output of the lower blower 10 for preventing air from flowing in and out from the lower blowing lower during cooling may be determined in accordance with the rotation speed of the upper blower 4.

That is, in this FIG. 8, steps 24 to 30 are the same as in FIG. 4, but during cooling, step 28a
The rotation speed Hi of the upper blower 4 (step 31a), Me
(Step 31b), L.

(Step 31C), the tachometer 15
The output of is input to the input circuit 19 to read only the rotation speed of the upper fan 4. In step 33, the required output of the lower fan 10 is calculated by the CPU 21, and in step 34, the specified output of the fan motor 40 for the lower blower is inputted from the output circuit 22. I am trying to output it.

[Effects of the Invention] As explained above, the present invention provides an indoor unit for an air conditioner that blows cold air from the upper air outlet during cooling and blows warm air from the upper air outlet and the lower air outlet during heating.
Equipped with a device that controls the air blowing capacity of the lower blower in order to prevent air from flowing in and out from the lower blower during cooling, providing high comfort, making the lower blower more compact, and allowing for air path switching. Since it does not require a damper, it can be done at low cost.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the indoor unit of the air conditioner according to the present invention, FIG. 2 is a sectional view of the indoor unit of the air conditioner described above, and FIG. 3 is a control of the indoor unit of the air conditioner described above. 4 is a control flowchart of the indoor unit of the air conditioner according to the above, FIG. 5 is a front view of another embodiment of the indoor unit of the air conditioner of the present invention, and FIG. 6 is the same as that of FIG. 7 is a cross-sectional view, and FIG. 8 is a block diagram of a half-control means of another embodiment of the indoor unit of an air conditioner according to the present invention.
The figure is a control flowchart of another embodiment of the indoor unit of the air conditioner according to the present invention, and FIGS. 9 and 10 are sectional views of the conventional indoor unit of the air conditioner, respectively. 1... Indoor unit main body, 2... Heat exchanger, 3...
・Air suction port, 4... Upper blower, 5... Upper blower outlet, 7... Lower blower outlet, 10... Lower blower, 13
...Fan motor for upper blower, 14...Fan motor for lower blower, 15...Tachometer, 16...Setting air speed switch, 17...Cooling/heating changeover switch, 18...
- Microcomputer, 23...Fan motor drive circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A heat exchanger provided opposite to the air inlet in the center front of the indoor unit of the air conditioner, an upper outlet provided above the air inlet of the indoor unit, and the air inlet A lower air outlet provided at the lower part of the indoor unit in the indoor unit, an upper blower provided above the air outlet in the indoor unit, and a lower air outlet provided inside the lower air outlet in the indoor unit. During cooling, the air cooled by the heat exchanger is blown out from the upper air outlet by the upper blower, and during heating, the air heated by the heat exchanger is blown out through the upper blower and the lower air blower. The blower controls the air to be blown out from the upper air outlet and the lower air outlet, and in order to prevent air from flowing in and out from the lower air outlet during cooling, the air blower blows air from the lower air outlet in accordance with the set wind speed of the upper air blower. An indoor unit of an air conditioner characterized by comprising means for controlling the air blowing capacity of an air blower. (2) The means for controlling the air blowing capacity of the lower blower is configured to control the air blowing capacity of the upper blower using the air blowing capacity of the upper blower in order to prevent air from flowing in and out from the lower air outlet during cooling. Characteristic claim 1
Indoor unit of air conditioner mentioned in section.