JP3281201B2 - Air conditioner - Google Patents

Abstract

PURPOSE: To uniform a temperature distribution in a room by holding down the other air stream by one air stream and smoothly guiding the air stream to a floor surface, and at the same time, perform a comfortable heating operation by a method wherein the temperature of air at an outlet is detected, and two blowers are respectively controlled based on the detection result. CONSTITUTION: At the time of heating operation, a compressor 5 is operated by a control unit, and an outdoor blower 14 and first blower 24 are respectively operated, and at the same time, a 4-way switching valve 6 is switched. Then, a refrigerant with a high temperature and high pressure, which is compressed and vaporized, is fed to an indoor heat-exchanger 9 through the 4-way switching valve 6. Then, the refrigerant is condensed and liquefied at the indoor heat-exchanger 9, and after being heat-radiated, the pressure is reduced by a capillary tube 8, and heat-exchanged with outside air by an outdoor heat-exchanger 7 and evaporated to form a refrigerating cycle. In the meantime, indoor air which is blown in by the first blower 24 is heated by making it pass an indoor heat-exchanger 9, and then, blown out as hot air. At this time, when a detected temperature of the indoor heat-exchanger 9 by a blown out air temperature sensor 31 becomes a specified temperature or higher, a second blower 28 is additionally operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to drive control of each blower in an air conditioner having two blowers.

[0002]

2. Description of the Related Art Generally, in an air conditioner for cooling and heating, when a heating operation is performed, warm air rises upward because the warm air is lighter than room air, and the warm air does not reach the floor surface, resulting in insufficient heating. There was a problem. Therefore, Japanese Patent Application Laid-Open No.
In the publication, an air conditioner provided with a second blower in addition to the first blower is disclosed. This is to make the warm air from the first blower be adjacent to the air at room temperature from the second blower and press the warm air downward, so that the warm air reaches the floor.

According to Japanese Utility Model Laid-Open Publication No. Sho 56-10219, blowers for sending airflow are arranged above and below a room, and when heating, low-temperature warm air is blown upward in the room and heat is exchanged downward. The warm air that is blown out and stays in the upper layer of the room is circulated downward by the blown airflow from above. In Japanese Utility Model Application Laid-Open No. 195019/1987, there is also an air conditioner that draws in warm air above the room, blows it out below the heat exchanger, and circulates the room.

[0004]

However, in the air conditioner disclosed in Japanese Patent Application Laid-Open No. Sho 62-178836, the number of rotations of each of the blowers is changed simply by rotating the first blower and the second blower in accordance with the blowing temperature. It did not change or drive on / off. Therefore, if the temperature of the hot air blown from the first blower is too high, the rising rate of the warm air will increase, and the air from the second blower having a constant rotation will not reach the floor sufficiently. On the other hand, if the blowing temperature from the first blower is too low, there is a problem that the air is cooled by the wind from the second blower and the area near the floor is too cold.

The air conditioner disclosed in Japanese Utility Model Laid-Open Publication No. Sho 56-10219 or Japanese Utility Model Laid-Open Publication No. Sho 62-195019 simply does not circulate warm air above the room, and forcibly reaches the floor surface. Did not.

[0006] In view of the above, an object of the present invention is to provide an air conditioner that allows hot air to efficiently reach a floor surface in accordance with a blowing temperature.

[0007]

As shown in FIG. 1, a means for solving the problem comprises, as shown in FIG. 1, a first blower 24 which draws in room air, performs heat exchange with a heat exchanger 9 and blows out from a first outlet 22. A second blower 28 for sucking room air, blowing out from the second blowout port 26, and guiding the airflow P blown out from the first blowout port 22 downward, and provided with blowout temperature detecting means 31 for detecting blowout temperature. The first blower 24 or the second blower 28 is controlled based on the temperature detected by the blow-out temperature detecting means 31.

That is, when the temperature detected by the blow-out temperature detecting means 31 reaches a certain temperature, the driving of the second blower 28 is started, or the first blower 24 and the second blower 24 are driven in accordance with the temperature detected by the blow-out temperature detecting means 31. Both of the blowers 28,
Alternatively, one of the rotation speeds is varied.

In order to reliably detect the temperature of the blow-off air, the blow-out temperature detecting means 31 is connected to the heat exchanger 9 and the first blow-out port 2.
2 are arranged.

[0010]

In the means for solving the above problems, when the heating operation is performed, the indoor air is sucked in by the first blower 24 and the indoor air subjected to the heat exchange in the heat exchanger 9 is blown out from the first outlet 22. At this time, the blow-out temperature between the heat exchanger 9 and the first blow-out port 22 is detected by the blow-out temperature detecting means 31, and when the detected temperature reaches a certain temperature,
The driving of the second blower 28 is started. Then, the room air is blown out from the second outlet 26. Further, according to the temperature detected by the blow-out temperature detecting means 31, the rotation speed of both or one of the first blower 24 and the second blower 28 is proportional to the low speed or the high speed, or the rise of the detected temperature. The rotation speed is changed so as to increase.

As a result, the airflow blown from the first blowout port 22 is held down by the airflow blown out from the second blowout port 26 and reaches the floor.

[0012]

【Example】

(First embodiment) As shown in FIG.
An indoor unit 1 placed indoors and an outdoor unit 2 placed outdoors are separated air conditioners connected via pipes 3 and 4, and a refrigeration cycle as shown in FIG. 2 is formed. ing. This refrigeration cycle includes the compressor 5
, A four-way switching valve 6, an outdoor heat exchanger 7, a capillary tube 8 as a pressure reducing device, and an indoor heat exchanger 9, and the refrigerant circulates through the connection pipes 10 to 13 and the pipes 3 and 4, respectively. I do. The indoor unit 1 is provided with an indoor heat exchanger 9, and the outdoor unit 2 is provided with a compressor 5, a four-way switching valve 6, an outdoor heat exchanger 7 and an outdoor blower 14. The valve 6 switches to the position shown by the broken line in FIG.
Refrigerant is compressor 5, connection pipe 13, four-way switching valve 6, connection pipe 1
1. The outdoor heat exchanger 7, the connecting pipe 12, the capillary tube 8, the low temperature side pipe 4, the indoor heat exchanger 9, the high pressure side pipe 3, and the four-way switching valve 6 circulate through the connecting pipe 10. On the other hand, during the heating operation, the four-way switching valve 6 is switched to the position indicated by the solid line in FIG. 2, and the refrigerant flows into the compressor 5, the connection pipe 13, the four-way switching valve 6, the high-pressure side pipe 3, the indoor heat exchanger 9, and the low-pressure side pipe 4. , Capillary tube 8, connecting tube 12, outdoor heat exchanger 7, connecting tube 1
Circulation from the 1- and 4-way switching valve 6 via the connecting pipe 10 is performed.

The indoor unit 1 is, as shown in FIG.
0 is formed in a box shape for wall hanging, and has a slit-shaped first suction port 2 formed from the center to the upper part of the front surface of the main body.
1 and a first outlet 22 formed in the lower part of the main body, and an upstream side of the first air passage 23 from the first inlet 21 to the first outlet 22 on the first inlet 21 side. The indoor heat exchanger 9 is disposed in the first outlet 2 more than the indoor heat exchanger 9.
On the downstream side of the second side, a first blower 24 that sucks in from the first suction port 21 and blows out the room air that has been subjected to heat exchange by the indoor heat exchanger 9 from the first outlet 22 is rotatably arranged. .

Here, in the heating operation, the airflow (warm air) P blown from the first outlet 22 becomes higher than the temperature of the room air, that is, the warm air P becomes lighter than the room air. As a result, the rising force increases and stays in the upper part of the room, and the warm air P does not reach the floor surface, resulting in insufficient heating. Therefore, a second suction port 25 is formed below the first suction port 21 of the indoor unit main body 20, and a second outlet 26 is provided below the second suction port 25 and above the first outlet 22. A second air flow path 27 extending from the second suction port 25 to the second air outlet 26 sucks room air from the second air inlet 25 and blows out the airflow Q from the second air outlet 26 to the first air outlet. A second blower 28 that guides the warm air P blown out from 22 downward is arranged rotatably. The second air flow path 27 is isolated from the first air flow path 23 so that the drawn indoor air does not pass through the indoor heat exchanger 9.

The first blower 24 and the second blower 28
Each of the blowers 24, 28a is a cross flow fan provided with a plurality of blades 24a, 28a in the radial direction.
Both ends of 28 are rotatably supported by the indoor unit main body 20, and are each driven by a drive unit such as a motor (not shown).

The indoor unit 1 is provided with room temperature detecting means 30 for detecting the indoor temperature and blow-out temperature detecting means 31 for detecting the blow-out temperature. The room temperature detecting means 30 is a room temperature sensor composed of a thermistor, and is located at a position where indoor air flows and is not affected by heat from the indoor heat exchanger 9, for example, near the first suction port 21 upstream of the indoor heat exchanger 9. Are located in The blowout temperature detecting means 31 is a blowout temperature sensor including a thermistor for detecting the temperature of the indoor heat exchanger 9, and is arranged near the indoor heat exchanger 9. In FIG. 1, reference numerals 32 and 33 denote louvers that change the direction of airflow.

Further, as shown in FIG. 3, the indoor unit 1 includes a control circuit 40 for controlling the indoor temperature to the set temperature in accordance with the contents set by the operation unit (not shown). The control circuit 40 includes a first blower relay 41 for turning on and off the motor of the first blower 24, a second blower relay 42 for turning on and off the motor of the second blower 28, and the four-way control valve 6.
Four-way control valve relay 43 for switching the outdoor air blower 1
, An outdoor blower relay 44 for driving the compressor 4, a compressor relay 45 for driving the compressor 5, and a control unit 4 for controlling each unit.
6 is comprised. And each relay 41-45
Are the motor of the first blower 24, the motor of the second blower 28, the four-way control valve 6, the outdoor blower 14, and the compressor 5 respectively.
These are connected in parallel to the power plug cord 47 together with the control unit 46 to supply AC power.

The control unit 46 is a microcomputer including a CPU, a RAM, a ROM, etc., and operates in accordance with a program stored in the ROM based on the contents of operation by the operation unit and an output signal from the room temperature sensor 30 and the like. 5, normal operation means 50 for operating the respective relays of the four-way switching valve 6, the outdoor blower 14 and the first blower 24 to perform the cooling operation or the heating operation, and the third operation based on the temperature detected by the blowout temperature sensor 31 during the heating operation. A warm air adjusting means 51 for controlling the two blowers 28 is provided. This hot air adjusting means 51 closes the second blower relay 42 and turns on the motor when the temperature of the indoor heat exchanger 9 detected by the blowout temperature sensor 31 exceeds a certain temperature, and drives the second blower 28 at a certain rotation speed. Things.

Next, the heating operation of the air conditioner having the above configuration will be described with reference to the flowchart of FIG.
When the user sets the desired heating operation using the operation unit and presses the start button, first, the compressor relay 45, the outdoor blower relay 44, the four-way switching valve relay 43, and the first blower relay 41 are controlled by a control signal from the control unit 46. Is closed, the compressor 5 is driven, the outdoor blower 14 and the first blower 24 are driven at a constant rotation speed, and the four-way switching valve 6 is switched to the solid line side in FIG. Then, the high-temperature and high-pressure refrigerant that has been compressed and vaporized by the compressor 5 is sent to the indoor heat exchanger 9 via the four-way switching valve 6, condensed and liquefied by the indoor heat exchanger 9, and radiates heat. After the pressure is reduced in 8 and heat is exchanged with the outdoor air in the outdoor heat exchanger 7 to evaporate, the operation returns to the compressor 5 and the refrigeration cycle is repeated, thereby performing the heating operation.

The indoor air sucked from the first suction port 21 by the first blower 24 is heated by passing through the indoor heat exchanger 9, and is heated through the first air flow path 23 to the first air outlet 22. , Warm air P is blown out, and the room air is warmed. At this time, if the detected temperature TA of the indoor heat exchanger 9 by the blow-out temperature sensor 31 is equal to or lower than a certain temperature T0 (for example, 40 ° C.), the second blower relay 42 is open, and the second blower 28 is stopped. Then, the room air is warmed by the warm air P, but the force of the warm air P tends to rise as the temperature rises, and the warm air stays above the room, and conversely, the warm air P near the floor surface. No longer reach and it gets cold.

Therefore, the controller 46 controls the blowout temperature sensor 3
1 detects that the detected temperature TA has become equal to or higher than 40 ° C., closes the second blower relay 42 and sets the second blower 2
8 is operated to rotate the second blower 28 at a constant speed. Then, the room air is sucked in from the second suction port 25, and the airflow Q is blown out from the second outlet 26 through the second air passage 27. At this time, the airflow Q from the second outlet 26 is blown out of the room air without passing through the indoor heat exchanger 9, so that the temperature is lower than the warm air P and reaches the floor without rising. Therefore, the warm air P from the first outlet 22 is pressed down from above by the airflow Q from the second outlet 26 and guided to the floor, and the floor is warmed by the warm air P.

Thereafter, when the temperature of the indoor heat exchanger 9 decreases and the detected temperature TA falls below 40 ° C., the second blower relay 42 is opened, and the drive of the second blower 28 is stopped.

As described above, the temperature of the indoor heat exchanger 9 is detected, and when the detected temperature TA reaches a certain temperature, the second blower 28 is rotated, so that the temperature blown out of the first outlet 22 is increased. The wind P is suppressed from above by the airflow Q from the second outlet 26 and is guided to the floor. In addition, when the operation is started or when the indoor heat exchanger 9 is at a low temperature, the second blower 28 is not driven, so that the low-temperature hot air P is cooled by the airflow Q from the second outlet 26 as in the related art. There is no. Therefore, the warm air P efficiently reaches the floor surface and the temperature distribution in the room becomes uniform, so that a comfortable heating operation can be performed.

Furthermore, in order to allow the warm air P to reach the floor surface, the floor surface is warmed up without increasing the heat exchange amount of the indoor heat exchanger 9 by increasing the heating set temperature and the like, and thereby providing effective heating. Since the operation can be performed, the power consumption is small and the user is not economically burdened.

Further, since the temperature of the indoor heat exchanger 9 is detected by the blow-out temperature sensor 31, the blow-out temperature can be accurately determined, which contributes to reliable hot-air adjustment control.

(Second Embodiment) In the air conditioner of the present embodiment, as shown in FIG. 5, as a second blower relay for turning on and off the second blower 28, a second blower having two kinds of low-side and high-side contacts is provided. A blower relay 60 is provided. The second blower relay 60 rotates the second blower 28 at a low speed when the low contact 60a is closed, and rotates the second blower 28 at a high speed when the high contact 60b is closed. Then, the hot air adjusting means 6 of the control unit 46
In 1, when the detected temperature TA of the indoor heat exchanger 9 from the blow-out temperature sensor 31 becomes equal to or higher than a certain temperature T1, the low-side contact 60a of the second blower relay 60 is closed, and when the detected temperature TA becomes equal to or higher than the certain temperature T2. The high-side contact 60b is closed, and the rotation speed of the second blower 28 is varied stepwise. Other configurations are the same as those of the first embodiment.

As shown in FIG. 6, when the start button of the heating operation is pressed, the compressor 5, the outdoor blower 14, and the first blower 24 are operated as shown in FIG.
Is driven, the four-way switching valve 6 is switched to the solid line side in FIG. 2, the refrigeration cycle is performed, and the heating operation is started. The first blower 24 is rotated at a constant speed.

In the control section 46, the detected temperature TA of the indoor heat exchanger 9 by the blow-out temperature sensor 31 is set to a constant temperature T.
If the temperature has not reached 1 (for example, 30 ° C.), the low-side and high-side contacts 60a and 60b of the second blower relay 60 are kept open, and the second blower 28 is kept stopped.

Thereafter, as the heating operation proceeds, the room is warmed by the warm air P from the first outlet 22 and the temperature of the indoor heat exchanger 9 rises, and the detected temperature TA
Is higher than 30 ° C., the control unit 46 closes the low-side contact 60 a of the second blower relay 60. Then, the second blower 28 starts rotating at a low speed, the airflow Q is blown out from the second outlet 26, and the warm air P from the first outlet 22 is pressed down from above by the airflow Q, and Reach the plane.

When the heating operation further proceeds and the temperature of the warm air P from the first outlet 22 rises, the warm air P is lightened and the force of rising upward in the room increases, and the low speed of the second blower 28 decreases. The airflow Q from the second outlet 26 due to the rotation cannot be held down. Therefore, when the detected temperature TA of the blow-out temperature sensor 31 becomes equal to or higher than the predetermined temperature T2 (45 ° C.), the control unit 46 opens the low contact 60a of the second blower relay 60 and closes the high contact 60b. Then, the second blower 28
Rotates at a high speed, the amount of airflow Q from the second outlet 26 increases, and presses the warm air P from the first outlet 22 from above, causing the warm air P to reach the floor surface.

As described above, the rotation speed of the second blower 28 is changed stepwise from the low-speed rotation to the high-speed rotation in accordance with the temperature rise of the indoor heat exchanger 9, so that the force for raising the hot air P is reduced. Even if it becomes larger, the air volume of the airflow Q from the second outlet 26 increases, and the warm air P can reliably reach the floor.

(Third Embodiment) In the air conditioner of the present embodiment, as shown in FIG. 7, a linear control section 70 is arranged instead of the second blower relay for turning on and off the second blower 28. The linear control unit 70 controls the voltage to the second blower 28 by changing the phase using a semiconductor element such as a thyristor. Then, the hot air adjusting means 71 of the control unit 46 operates the linear control unit 70 in accordance with the temperature change of the indoor heat exchanger 9 from the blow-out temperature sensor 31 to continuously adjust the rotation speed of the second blower 28. Make it variable.
The other configuration is the same as that of the first embodiment.

In the above configuration, the heating operation is started as shown in FIG. 8, and the temperature TA detected by the blow-out temperature sensor 31 of the indoor heat exchanger 9 is at a certain temperature T3 (for example, 30 ° C.).
If it has not reached, the second blower 28 remains stopped, but the detection temperature TA of the blow-out temperature sensor 31 rises,
When the detected temperature reaches 30 ° C., the linear control unit 70 operates according to a control signal from the control unit 46, and the second blower 28 starts rotating at a speed of, for example, 1500 rpm as shown in FIG. Then, the warm air P from the first outlet 22 is pressed into the airflow Q from the second outlet 26 and guided to the floor.

Further, the heating operation proceeds, and the indoor heat exchanger 9
Of the hot air P from the first outlet 22
Is going to rise, but the second blower 28
Is proportional to the temperature rise of the indoor heat exchanger 9, the number of revolutions of the heat exchanger 9 increases, and the detected temperature T
2000 rpm when A is 40 ° C, detection temperature TA is 50 ° C
Then, the second blower 28 rotates at a rotation speed of 2500 rpm.

Therefore, the amount of airflow Q from the second outlet 26 increases in accordance with the temperature rise of the warm air P, so that the warm air P from the first outlet 22 can efficiently reach the floor.
Thus, the same effect as in the second embodiment can be obtained. Moreover, since the semiconductor device is used to control the voltage to the second blower 28 to vary the number of revolutions, it is possible to perform on / off or stepwise variation by opening and closing the contact as in the first or second embodiment. In comparison, a trouble such as a contact opening / closing operation defect does not occur, and the hot air adjustment control can be performed reliably.

(Fourth Embodiment) In the first to third embodiments, the second blower 28 is turned on and off, or the rotation speed of the second blower 28 is varied so that the warm air P reaches the floor. However, in the air conditioner of the present embodiment, as shown in FIG. 10, a first blower relay 80 having two types of low-side and high-side contacts is disposed as a first blower relay for turning on and off the first blower 24. Have been. The first blower relay 80 rotates the first blower 24 at a low speed when the low contact 80a is closed, and rotates the first blower 24 at a high speed when the high contact 80b is closed. Then, in the hot air adjusting means 81 of the control unit 46, if the detected temperature TA of the indoor heat exchanger 9 from the blow-out temperature sensor 31 has not reached a certain temperature T3, the first blower relay 80
The low-side contact 80a is closed, and when the temperature TA becomes equal to or higher than the predetermined temperature T3, the high-side contact 80b is closed and the rotation speed of the first blower 24 is varied stepwise. In addition, the second blower 28
Is driven at a constant speed when the first blower 24 switches from low-speed rotation to high-speed rotation, and is stopped when the first blower 24 rotates at low speed. Other configurations are the same as in the first embodiment.

In the above configuration, as shown in FIG. 11, when the start button is turned on, the low-side contact 80a of the relay 80 is closed and the first blower 24 rotates at a low speed. When the heating operation is started, the temperature TA of the indoor heat exchanger 9 is detected. If the detected temperature TA has not reached a certain temperature T4 (for example, 40 ° C.), the low side of the first blower relay 80 With the contact 80a kept closed, the first blower 24 continues to be driven at a low speed. afterwards,
When the detection temperature TA from the blowout temperature sensor 31 becomes 40 ° C. or higher, the low contact 80a of the first blower relay 80 is opened, the high contact 80b is closed, and the first blower 24 rotates at high speed, and the first blower 24 rotates at high speed. The amount of warm air P from the outlet 22 increases.

At the same time as the first blower 24 is switched to high-speed rotation, a control signal is sent from the control unit 46 to the second blower relay 28, the second blower relay 42 is closed, and the second blower 28 , And the warm air P from the first outlet 22 is pressed into the airflow Q from the second outlet 26 and guided to the floor. The driving of the second blower 28 may be rotated simultaneously with the start of the heating operation.

As described above, when the temperature of the indoor heat exchanger 9 increases, the rotation speed of the first blower 24 is increased to increase the amount of the hot air P. The reach is longer. In addition, since the second blower 28 is rotated to guide the warm air P to the floor surface from the second air outlet 26 by the airflow Q, the floor surface is reliably warmed and the temperature distribution in the room becomes uniform.

(Fifth Embodiment) In the air conditioner of the present embodiment, as shown in FIG. 12, a linear control section 90 is arranged in place of the first blower relay for turning on and off the first blower 24. The linear control section 90 controls the voltage to the first blower 24 by changing the phase using a semiconductor element such as a thyristor. Then, the hot air adjusting means 91 of the control unit 46 operates the linear control unit 90 in accordance with the temperature change of the indoor heat exchanger 9 from the blow-out temperature sensor 31 to continuously adjust the rotation speed of the first blower 28. Make it variable. The other configuration is the same as that of the fourth embodiment, and the second blower 28 rotates at a constant speed when the detection temperature TA of the blowout temperature sensor 31 becomes 30 ° C. or higher.

In the above configuration, as shown in FIG. 13, when the start button is turned on, the heating operation starts, but at this time, the first blower 24 is stopped. Then, the temperature TA of the indoor heat exchanger 9 is detected, and if the detected temperature TA has not reached a certain temperature T5 (for example, 30 ° C.), the first blower 24 remains stopped, that is, immediately after the start of operation. During the warm-up operation, the first blower 24 is stopped until the temperature of the indoor heat exchanger 9 rises to some extent. Thereafter, when the temperature of the indoor heat exchanger 9 rises and the detected temperature TA of the blowout temperature sensor reaches 30 ° C., the linear control unit 90 is operated by the control signal from the control unit 46, and as shown in FIG. The first blower 24 starts rotating at, for example, 800 rpm. At the same time, the second blower relay 42 is closed, the second blower 28 rotates at a constant speed, and the first outlet 2
The hot air P from 2 is pressed into the airflow Q from the second outlet 26 and guided to the floor.

Further, the heating operation is continued, and the indoor heat exchanger 9
Rises in temperature, the rotation speed of the first blower 24 changes in proportion to the rise,
The first blower 24 rotates at 1000 rpm when the detection temperature TA of 1 is 40 ° C. and at 1200 rpm when the detection temperature TA is 50 ° C. The first blower 24 may be rotated at the same time as the operation is started, and the rotation speed may be set to 800 rpm or a low speed lower than that. In addition, the drive of the second blower 28 may be rotated simultaneously with the start of operation.

As described above, the rotation speed of the first blower 24 is continuously varied in accordance with the temperature of the indoor heat exchanger 9, so that the reach of the warm air P from the first outlet 22 is increased, and the warm air P by the air flow Q from the second air outlet 26 efficiently can trigger reaches the floor, the same effect as the fourth embodiment can be obtained. In addition, compared to a device that performs on / off and stepwise change by opening / closing contacts such as a relay, there is no problem such as a contact opening / closing operation defect, and the hot air adjustment control can be performed reliably.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention. For example, in the first to third embodiments, the on / off and the rotation speed of the second blower 28 are changed according to the detected temperature of the blowout temperature sensor 31, and in the fourth and fifth embodiments, the detected temperature of the blowout temperature sensor 31 is changed. The rotation speed of the first blower 24 was varied according to the first blower 2.
If both the fourth fan 28 and the second blower 28 are controlled, the floor surface can be more efficiently heated, and an effective heating operation can be performed.

The outlet temperature sensor 31 is disposed near the indoor heat exchanger 9 to detect the temperature of the indoor heat exchanger 9. The outlet temperature sensor 31 is connected to the indoor heat exchanger 9 and the first outlet 22. , For example, the first air flow path 2
3 or near the first outlet 22. Furthermore, the blow-out temperature sensor 31 may be provided at a position separated from the indoor unit main body 20, for example, at a remote control transmitter of an air conditioner to detect the temperature of the blown-out air.

Although a thermistor is used as the outlet temperature sensor 31, a thermostat using a bimetal or the like may be used. In this case, only a single temperature can be detected, but this can be achieved by providing a plurality of components having different operating temperatures.

[0047]

As is apparent from the above description, according to the present invention, the blowout temperature is detected, and when the detected temperature reaches a certain temperature, the second blower is rotated or the first blower is operated according to the detected temperature. By changing the rotation speed of both the blower and the second blower, or one of the two, the airflow blown out of the first outlet is pressed down from above by the airflow from the second outlet, and is guided to the floor surface. .

Further, when the blowing temperature is equal to or lower than the predetermined temperature, the second blower is not driven, so that the low-temperature airflow from the first outlet is cooled by the airflow from the second outlet as in the related art. Never. Therefore, the airflow from the first outlet efficiently reaches the floor surface, and the temperature distribution in the room becomes uniform, so that a comfortable heating operation can be performed.

Furthermore, in order to warm the floor surface, it is possible to increase the heat exchange amount of the heat exchanger without increasing the heating set temperature or the like.
As it becomes warm to the floor surface and can perform effective heating operation,
It requires less power and does not impose an economic burden on the user.

Further, since the temperature of the blow-out between the heat exchanger and the first blow-out port is detected by the temperature detecting means, the blow-out temperature can be accurately determined, which contributes to reliable hot-air adjustment control.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an air conditioner according to a first embodiment of the present invention.

FIG. 2 Refrigeration cycle diagram

FIG. 3 is a control circuit diagram of the air conditioner.

FIG. 4 is a flowchart showing a heating operation.

FIG. 5 is a control circuit diagram of the air conditioner of the second embodiment.

FIG. 6 is a flowchart showing the heating operation.

FIG. 7 is a control circuit diagram of the air conditioner of the third embodiment.

FIG. 8 is a flowchart showing the heating operation.

FIG. 9 is a diagram showing a relationship between a detected temperature of an outlet temperature sensor and a rotation speed of a second blower.

FIG. 10 is a control circuit diagram of an air conditioner according to a fourth embodiment.

FIG. 11 is a flowchart showing the heating operation.

FIG. 12 is a control circuit diagram of an air conditioner according to a fifth embodiment.

FIG. 13 is a flowchart showing the heating operation of the same.

FIG. 14 is a diagram showing a relationship between a detection temperature of an outlet temperature sensor and a rotation speed of a first blower.

[Explanation of symbols]

 9 indoor heat exchanger 22 first outlet 24 first blower 26 second outlet 28 second blower 31 outlet temperature sensor

──────────────────────────────────────────────────の Continued on the front page (72) Kayoko Ishiburo 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Masako Kobayashi 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp shares In-house (56) References JP-A-62-178836 (JP, A) JP-A-4-9539 (JP, A) JP-A-4-356653 (JP, A) JP-A-57-24932 (JP, U (58) Fields surveyed (Int. Cl. ⁷ , DB name) F24F 11/053 F24F 1/00 401

Claims (4)

(57) [Claims] A first air flow path extending from a first suction port on a front surface to a first air outlet on a lower side, and a second air inlet located below the first air inlet inside the indoor unit main body. A second air flow path leading to a second air outlet located above the one air outlet; a heat exchanger and a first blower are disposed in the first air flow path; second blower disposed in said second air flow path is formed is isolated from the first air flow path in the lower front of the heat exchanger, the air temperature detecting means for detecting a temperature out can blow, and a control unit is provided for controlling the driving of the first fan or the second fan based on the temperature detected by the該吹out temperature detecting means, said
The control unit controls the temperature detected by the outlet temperature detecting means to be constant.
When the temperature is reached, the rotation speed of the first blower is reduced
From high speed, and drive the second blower
An air conditioner which starts , blows out an airflow from the second outlet, and guides an airflow blown out from the first outlet downward. 2. The control unit increases the rotation speed of the first blower.
The air conditioner according to claim 1 , wherein the second blower is stopped when the speed is switched from low to low . 3. The rotation speed of the first blower is continuously varied.
A linear control unit is provided.
The linear controller is activated according to the change in the detected temperature due to the step.
The air conditioner of claim 1, wherein the to movement. 4. The blowout temperature detecting means is separated from the indoor unit main body.
3. The device according to claim 1, wherein the first and second portions are provided at spaced positions.
Or the air conditioner according to 3.