JPH05106902A - Air conditioner - Google Patents

Abstract

PURPOSE:To uniformalize the temperature distribution in a room quickly and surely by obtaining the differences of respective changes in temperature at two positions, the first and second positions in the room and changing the direction of blow-out so as to reduce the differences under special conditions when the differences are more than a specified value. CONSTITUTION:A temperature sensor which is received in the main body of an air conditioner consists of a pair of radiation heat detection sections 2A, 2B in a casing 1 which has an open section 1a. The radiation detection sections 2A and 2B are disposed in parallel. The respective radiation head detection sections 2A and 2B arrange heat receiving plates 5a, 5b near the focal points of a pair of reflection mirrors 4a, 4b which are provided parallel in pair horizontally, and respective heat receiving plates 5a, 5b are provided with first and second temperature sensor 6a, 6b. And the differences of the detected temperatures from at the time of starting operation to the time of after the starting, that is, a first and second changes in detected temperature are given. If the difference of those changes in detected temperatures is >=30 deg.C, and the difference at present of detected temperature by respective sensors is >=30 deg.C, the direction of blow-out of the air conditioner is changed to reduce the difference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having means for changing the blowing direction.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Examined Patent Publication No. 61-49574 and Japanese Utility Model Laid-Open No. 56-3344, an air conditioner which detects temperatures at a plurality of positions and changes the blowing direction of the air conditioner. was there.

In such an air conditioner, the blowing direction is controlled so that the temperature is low during heating and the temperature is high during cooling. As a result, the deviation of the temperature distribution in the room can be alleviated and the temperature of the entire room can be kept uniform.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
If there are differences in temperature at multiple points in the room, the wind direction is controlled so that the differences are alleviated. Therefore, in the case of a configuration in which the temperature difference between two points in the left-right direction is detected, for example, when heating, when the temperature at the left position becomes lower than that at the right position, the wind direction is set to the left.

However, in a situation where there is little temperature change such as at the start of operation, the wind direction is set to the left, and as a result, the temperature at the left position rises higher than the temperature at the right position. When this happens, the wind direction changes to the right, and the temperature at the right position becomes higher than at the left position. In this way, the wind direction frequently changes to the left and right, and there is a problem that the temperature distribution in the entire room is not uniformed or that it takes a very long time to be uniformed. The present invention takes the above circumstances into consideration, and it is an object of the present invention to provide an air conditioner according to any one of claims 1 to 3, which can quickly and reliably equalize the temperature of the entire room. To aim.

[0006]

An air conditioner according to a first aspect of the present invention includes a first temperature sensor for detecting a temperature at a first position in a room and a second temperature sensor for detecting a temperature at a second position in the room. In the provided air conditioner, the detected temperatures Tr ₁ (0) and Tr ₂ (0) at the start of operation of the first and second temperature sensors
And the difference between the detected temperature Tr ₁ (t) and Tr ₂ (t) after the start of operation and the detected temperature change of the first temperature sensor and the second temperature sensor {Tr ₁ (0) −Tr ₁ (t ) − [Tr
₂ (0) −Tr ₂ (t)]} for detecting temperature change difference,
The temperature change difference obtained by the temperature change difference detection means is the first
When the value is equal to or higher than the set value, the detected temperature Tr of the first temperature sensor
_If the difference between ₁ (t) and the detected temperature Tr ₂ (t) of the second temperature sensor is not less than the second set value, wind direction changing means for changing the blowing direction of the air conditioner so as to mitigate the difference. Is provided.

An air conditioner according to a second aspect of the present invention is the radiant heat temperature sensor, wherein the first and second temperature sensors according to the first aspect are provided in the air conditioner main body so as to detect the radiant heat temperatures in different directions.

The air conditioner according to claim 3 is the first or second air conditioner.
The wind direction changing means in the invention changes the blowing direction to the left and right by rotating the left and right louvers, and the left and right louver drive that changes the position of the center of rotation of the left and right louvers in the left and right direction and rotates the left and right louvers within a predetermined range in that state. Contains the circuit.

[0009]

In the air conditioner according to any one of claims 1 to 3, the difference between the temperature change at the first position and the temperature change at the second position in the room is calculated, and the difference in temperature change is equal to or larger than the first set value. When
If the difference between the temperature at the first position and the temperature at the second position at the present time is equal to or greater than the second set value, the blowing direction is changed to reduce the difference.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a temperature sensor unit S housed in the air conditioner body.

In the figure, reference numeral 1 is a rectangular opening 1 on the front side.
In the casing 1, a pair of radiant heat detectors 2A and 2B are arranged side by side. Between the back side of these radiant heat detectors 2A and 2B and the inside of the casing 1,
The heat insulating material 3 is filled.

The radiant heat detectors 2A and 2B are a pair of reflecting mirrors 4a and 4b, which are arranged in a row in the horizontal direction in the horizontal direction in the figure, and receive heat disposed near the focal points of the reflecting plates 4a and 4b. Plates 5a and 5b, heat receiving plates 5a and 5b
It is composed of a first temperature sensor 6a and a second temperature sensor 6b, which are attached to each.

The peripheral ends of the reflecting mirrors 4a and 4b are fixed by a pressing plate 7, and the reflecting mirrors 4a and 4b are, for example, parabolic mirrors having the same curvature, which are press-formed products of metal thin plates, Alternatively, it can be obtained by surface-plating a resin molded product. Mutually, the axes 8a and 8b are located at the center position,
Different directivities are provided in the left and right directions so as to intersect at a point on the central axis 9 that is inclined inwardly at the same angle with respect to each other and extends from the connection position of the reflecting mirrors 4a and 4b.

Therefore, the field of view as the reflecting mirrors 4a and 4b largely intersects with the front surface of the casing opening 1a, but the edge line along the mutual connecting portion becomes a virtual thermal boundary line, and each reflecting mirror 4a, 4b. 4b itself is in a thermally separated state. The heat receiving plates 5a and 5b are disk-shaped here, and are formed of, for example, a thin glass plate in order to reduce the heat capacity of themselves.

The heat receiving plates 5a and 5b are provided for suppressing the heat conduction from the outside, so that the elongated bridge fixing body 10 is provided.
It is supported at a predetermined position by a and 10b. The temperature sensors 6a and 6b, which detect the radiant heat temperature, are bonded and fixed to the rear surface side of the reflecting mirrors 4a and 4b facing the mirror surface by using a heat conductive adhesive. These temperature sensors 6a, 6b
The signal output of 1 is taken out by a lead wire (not shown) connected to the temperature sensors 6a and 6b.

The temperature sensors 6a, 6b are heat receiving plates 5a, 5 supported by elongated bridge fixing bodies 10a, 10b.
Since it is attached to b, it is in a state of floating in the air together with the heat receiving plates 5a and 5b, and the influence of heat conduction is extremely small. Further, since the back surfaces of the heat receiving plates 5a and 5b have high reflectance, secondary radiation from the back surfaces to the temperature sensors 6a and 6b is also reduced.

The front opening 1a of the casing 1 for accommodating the radiation detecting portions 2A and 2B has a thickness of 100 μm, for example.
It is closed by the infrared ray transmissive film 11 made of a polyethylene sheet. From this fact, only infrared rays are transmitted into the casing 1, and the influence of the blown airflow in the external environment is not affected.
a, 5b and the temperature sensors 6a, 6b, etc. are not reached.

The temperature sensor unit S thus constructed is attached to the indoor unit Y of the air conditioner. That is, the front panel 12 of the indoor unit Y of the air conditioner and the infrared permeable film 11 face each other with a gap.

At least the front panel 12 is generally
Alternatively, only the portion where the slits 13 are provided needs to be formed of a material having a low emissivity, for example, an aluminum material, a stainless material, or a white synthetic resin material panel. Instead of these materials, a treatment to reduce the emissivity, for example, a plating treatment of aluminum or the like may be performed.

A plurality of slits 13 ... As shown in FIGS. 1 and 2, are provided at a portion of the front panel 12 facing the infrared ray transmitting film 11. The longitudinal direction of these slits 13 must be aligned with the direction in which the radiant heat detectors 2A and 2B are arranged side by side for the reason described later. Since the radiant heat detecting portions 2A and 2B are arranged side by side in the horizontal direction, the slits 13 are also formed to be long in the horizontal direction.

Next, the reason why the longitudinal direction of the slits 13 ... Is coincident with the arranging direction of the radiant heat detecting portions 2A and 2B will be described. In FIG. 3, only one reflecting mirror 4a is shown here.
Represents the field of view of. When the front panel 12 arranged in front of the infrared permeable film 11 is provided with, for example, a plurality of slits a ... Which are long in the vertical direction orthogonal to the horizontal direction, the field of view is preliminarily oriented in a direction inclined with respect to the front panel 12. Therefore, the number of parts blocked by the remaining panel parts b ...

That is, the ineffective part of the visual field range blocked by the remaining panel parts b ... Is increased, and as a result, the transmission area for the slit a, which is originally obtained as an effective visual field part, is narrowed.

As described above, the longitudinal direction of the slit 12 should not be oriented in the direction orthogonal to the direction in which the radiant heat detecting portions 2A and 2B are arranged side by side.
It is formed in the horizontal direction that coincides with the direction in which A and 2B are arranged side by side. As a result, the ineffective portion is extremely small, and the effective visual field portion can be made wider and longer.

As shown in FIGS. 4 and 5, the temperature sensor unit S is mounted in the indoor unit Y of the air conditioner. The indoor unit Y is provided with an air suction port 16 in the upper front part of the air conditioner body 15 and an air outlet 1 in the lower front part.
7 is provided. The temperature sensor unit S is arranged inside the air outlet 17 laterally.

From the structure of the radiant heat detecting sections 2A and 2B,
As shown in FIG. 4, these visual field ranges are distributed to the left and right when viewed from the front of the air conditioner body 15, and as shown in FIG. 5, they match when viewed from the side.

That is, the first and second temperature sensors 6a, 6
b is a radiant heat temperature sensor that detects radiant heat temperatures in different left and right directions, and the first temperature sensor 6a detects the temperature at a first position (= a predetermined position on the right side toward the air conditioner body 15) in the room, The temperature of the second position (= a predetermined position on the left side of the air conditioner body 15) in the room is detected by the second temperature sensor.

Here, the operation of the temperature sensor unit S will be described. When heat is radiated from the wall surface or floor surface, the radiant heat energy becomes infrared light and the temperature sensor unit S
Projected on.

That is, as shown in FIG. 6 and FIG.
Radiant heat energy is projected to the temperature sensor unit S in the air conditioner main body 15 from the field-of-view range on the floor and the wall surface of the air-conditioned room R that is lined up in left and right.

As shown in FIG. 1 again, the radiant heat energy that has become infrared light passes through the slits 13 of the front panel 12 and the infrared transmitting film 11 and is projected on the reflecting mirrors 4a and 4b, where it is focused. Reflects in a narrowed state.

The radiant heat energy reflected by the reflecting mirrors 4a, 4b is concentratedly taken in by the heat receiving plates 5a, 5b and transmitted to the temperature sensors 6a, 6b. Each temperature sensor 6
The temperature detected by a and 6b is output to the outside through a lead wire. The radiation exchange heat quantity Q of the wall surface or floor surface, which is the heat receiving surface, is expressed by the following equation. Q = Ε _r · Ε _w · F · K · A _p · σ (T _r ⁴ -T _w ⁴ ) · Η − Ε _r · Ε _p · F · (1-K) · A _p · σ (T _p ⁴ -T _r ⁴ ) ・ Η Q: Radiation exchange heat (Kcai / h) Ε _r : Heat-receiving plate emissivity Ε _w : Wall and floor emissivity F: Form factor K: Effective field ratio (effective field / total field) A _p : Reflection Mirror projected area σ: Boltzmann constant T _r : Radiation detection temperature (° K) T _w : Wall and floor temperature (° K) T _p : Front panel temperature η: Polyethylene infrared transmittance

The field-of-view range of such a temperature sensor unit S is such that the reflecting mirrors 4 arranged side by side are arranged side by side.
The inclination angles of the axes 8a and 8b of a and 4b, the curvature as a parabolic mirror, the diameter areas of the heat receiving plates 5a and 5b, and the reflecting mirror 4.
It can be freely adjusted by setting various distances between the a and 4b and the heat receiving plates 5a and 5b.

In particular, since the temperature sensors 6a and 6b are arranged in a state of floating in the air together with the heat receiving plates 5a and 5b, and are in the same air layer in the casing 1 by the infrared ray transmitting film 11, even if external temperature influences occur. Even if there is, it will be affected in the same way, and the detection accuracy of the left-right difference can be kept high.

Since the infrared ray permeable film 11 is provided so as to close the front opening of the casing 1, at the same time as transmitting infrared rays, it prevents dust and the like floating in the air-conditioned room R from entering the inside.
Therefore, the reflectance of the reflecting mirrors 4a and 4b does not decrease. Further, since the infrared transmitting film 11 is configured to be protected by the front panel 12, it is possible to prevent the infrared transmitting film 11 from being broken by a finger or a stick.

Since the longitudinal directions of the slits 13 are aligned with the arranging direction of the radiant heat detecting portions 2A and 2B, the effective visual field portion can be widened in the visual field range of the respective reflecting mirrors 4a and 4b, and the front panel 12 is provided. It is possible to suppress the secondary radiation from the minimum and secure an effective visual field for difference detection.

The front panel 12 is treated with a material having a low emissivity such as an aluminum material or a plating treatment with an aluminum material to reduce the emissivity, so that the secondary radiation from the front panel 12 is minimized. Suppress to the limit. In addition, the radiant exchange heat quantity Q of the wall surface or floor surface described above
In the equation for obtaining, the negative heat quantity shown below − (Manas code), that is,

Ε _r · Ε _p · F · (1-K) · A _p · σ
(T _p ⁴ -T _r ⁴ ) .Eta. Is nothing but the amount of secondary radiation heat of the front panel 12. With the above configuration, the front panel 12
Since the amount of secondary radiant heat from is reduced, the required amount Q of radiant exchange heat can be sufficiently secured.

On the other hand, as shown in FIG. 8, the inside of the air conditioner main body 15 has an indoor heat exchanger 21 at a position corresponding to the air suction port 16, and from the indoor heat exchanger 21 to the air outlet 17. A ventilation path is formed by the heat insulating material 22. In the ventilation passage, the indoor fan 23, the left and right louvers 24, and the upper and lower louvers 25 are sequentially provided from the indoor heat exchanger 21 side to the air outlet 17.

As shown in FIG. 9, the left and right louvers 24 are composed of a large number of blades connected by a rod 24a at predetermined intervals, and one end of each blade is rotated in the left-right direction by the operation of a motor 24M. It is possible to change the blowing direction into the room to the left or right by the movement.

As shown in FIG. 9, the upper and lower louvers 25 rotate the blades in the vertical direction by the operation of the motor 25M. By rotating the blades, the blowing direction into the room can be changed up and down. In addition, the air conditioner body 15 is shown in FIG.
The control circuit shown in is mounted. A control unit 30 includes a microcomputer and its peripheral circuits and controls the air conditioner in general. The first temperature sensor 6a, the second temperature sensor 6b, the left and right louver drive circuit 31, and the left and right louver drive circuit 32 are connected to the control unit 30.

The left / right louver drive circuit 31 drives the motor 24M of the left / right louver 24 in response to a command from the control unit 30, and changes the position of the center of rotation of the left / right louver 24 in the left / right direction. It functions to rotate 24 within a predetermined range. That is, the left and right louvers 24 and the left and right louver drive circuit 31 are constituent elements of the wind direction changing means described later. The upper and lower louver drive circuit 32 includes the control unit 30.
The motor 25M of the upper and lower louvers 25 is driven in accordance with the command.

Reference numeral 40 denotes a remote control type operation device (hereinafter, abbreviated as a remote controller) for transmitting data of various operating conditions to the control unit 30 by infrared light. The control unit 30 has the following functional means.

(1) The difference between the detected temperature Tr ₁ (0) at the start of operation of the temperature sensor 6a and the detected temperature Tr ₁ (t) after the start of operation (= a predetermined position on the right side of the air conditioner body 15) Change of temperature) of each).

(2) The difference between the detected temperature Tr ₂ (0) at the start of operation of the temperature sensor 6b and the detected temperature Tr ₂ (t) after the start of operation (= a predetermined position on the left side of the air conditioner body 15) Change of temperature) of each).

(3) Difference Tw {= between the change in the detected temperature of the temperature sensor 6a and the change in the detected temperature of the temperature sensor 6b.
Tr ₁ (0) -Tr ₁ (t)-[Tr ₂ (0) -Tr ₂ (t)]}
A temperature change difference detecting means for obtaining.

(4) When the obtained temperature change difference Tw is equal to or larger than the first set value (for example, 3 ° C.), the detected temperature Tr ₁ (t) of the temperature sensor 6a and the detected temperature Tr of the temperature sensor 6b.
₂ calculates a difference _{Tn [= Tr 1 (t)} -Tr 2 (t)] of the (t), the absolute value of the temperature difference Tn is the second set value (for example 3
(° C.) or higher, an airflow direction changing means for changing the blowing directions of the left and right louvers 24 in a direction to reduce the difference. Next, how the wind direction control based on the temperature detection of the temperature sensors 6a and 6b is performed will be described with reference to FIGS.

When the operation (for example, the heating operation) is started (YES in step S1), the temperature T detected by the temperature sensor 6a is detected.
The r ₁ (0) and the temperature Tr ₂ (0) detected by the temperature sensor 6b are read (step S2) and stored in the memory in the control unit 30 (step S3).

Simultaneously with the start of the operation, the control unit 30 starts the time count t (step S4), and the detected temperature Tr ₁ (t) of the temperature sensor 6a and the temperature sensor 6b are detected at regular intervals based on the time count t. Temperature Tr ₂
(t) is read (step S5). The difference between the stored detected temperature Tr ₁ (0) and the stored detected temperature Tr ₁ (t), that is, the temperature change at the predetermined position on the right side toward the air conditioner body 15, is sequentially calculated. Stored detection temperature Tr
The difference between ₂ (0) and the detected temperature Tr ₂ (t), that is, the temperature change at a predetermined position on the left side of the air conditioner body 15, is sequentially calculated.

The difference Tw {= Tr ₁ between the calculated temperature change of the temperature sensor 6a and the calculated temperature change of the temperature sensor 6b.
_{(0) -Tr 1 (t)} - [Tr 2 (0) -Tr 2 (t)]} is calculated (step S6). It is determined whether or not the calculated temperature change difference Tw is 3 ° C. or more, which is the first set value (step S7).

If the temperature change difference Tw is smaller than 3 ° C. (NO in step S7), the center of rotation of the left and right louvers 24 is shown in FIG.
It is fixed to the reference position D shown in (step S8). In this state, the left and right louvers 24 are rotated within the range of 40 ° to the left and right (step S13). That is, the left and right louvers 24
Is rotated in the range from B position to F position. While the time count t does not reach the set time of 10 minutes, the rotation is continued as it is (step S14). That is, in a situation where the temperature change is small as at the start of the operation, the left and right louvers 24 are directly in front of each other for 10 minutes. Set to position.

When the temperature change difference Tw becomes 3 ° C. or more (YES in step S7), the detected temperature Tr of the temperature sensor 6a is Tr.
Difference T between ₁ (t) and detection temperature Tr ₂ (t) of temperature sensor 6b
n [= Tr ₁ (t) −Tr ₂ (t)] is calculated, and it is determined whether the absolute value of the temperature difference Tn is 3 ° C. or more (step S9).

When the absolute value of the temperature difference Tn is smaller than 3 ° C. (NO in step S9), the left and right louvers 24 continue to rotate with the center of rotation set to the reference position D (step S9).
8, S13). When the absolute value of the temperature difference Tn is 3 ° C. or more (YES in step S9), it is determined whether the temperature difference Tn is positive or negative (step S10).

If the temperature difference Tn is positive (Tr ₁ (t)> Tr
₂ (t)), and the center of rotation of the left and right grills 20 is 20 in the direction in which the temperature difference Tn is alleviated, that is, in the detection direction of the temperature sensor 6b which is the low temperature side (left side toward the air conditioner body 15).
It is moved to the C position (step S11). In this state, the left and right louvers 24 are in the range of 40 degrees on each side,
That is, it is rotated in the range from the A position to the E position (step S
13).

If the temperature difference Tn is negative (Tr ₁ (t) <Tr
₂ (t)), and the center of rotation of the left and right grills 24 is 20 in the direction in which the temperature difference Tn is alleviated, that is, in the detection direction of the temperature sensor 6a on the low temperature side (right side toward the air conditioner body 15).
It is moved to the E position (step S11). In this state, the left and right louvers 24 are in the range of 40 degrees on each side,
That is, it is rotated in the range from the B position to the F position (step S
13). When cooling, the center of rotation of the left and right grills 24
The temperature difference Tn is moved to a direction in which it is relaxed, that is, to the high temperature side.

In this way, the temperature change between the left and right positions centering on the air conditioner main body 15 is sequentially monitored, and when the difference between the temperature changes is 3 ° C. or more, the current temperature difference between the left and right positions is 3. By changing the wind direction so as to reduce the temperature difference only when the temperature is equal to or higher than 0 ° C, frequent repetition of the wind direction to the left and right is eliminated, and the temperature of the entire room can be made uniform quickly and surely.

Although the radiant heat temperature sensor provided in the air conditioner main body is used as the first temperature sensor and the second temperature sensor in the above embodiment, for example, a plurality of temperature sensors are attached at different positions on the floor of the room. The temperature sensors may be used as the first temperature sensor and the second temperature sensor.

[0056]

As described above, in any of the air conditioners according to claims 1 to 3, the difference between the temperature change at the first position and the temperature change at the second position in the room is calculated, and the temperature change is obtained. When the difference is equal to or larger than the first set value, and the difference between the temperature at the first position and the temperature at the second position at the present time is equal to or larger than the second set value, the blowing direction is changed to reduce the difference. Therefore, the temperature of the entire room can be made uniform quickly and surely.

[Brief description of drawings]

FIG. 1A is a cross-sectional plan view of a radiant heat temperature sensor showing an embodiment of the present invention. (B) is a front view of the radiant heat temperature sensor with a part omitted. (C) is a vertical cross-sectional view of the radiant heat temperature sensor.

FIG. 2 is a front view of a slit portion of the front panel.

FIG. 3 is an operation explanatory view of a radiant heat temperature sensor when slit directions are different.

FIG. 4 is a perspective view of an air conditioner indoor unit including a radiant heat temperature sensor.

FIG. 5 is a side view of the air conditioner indoor unit.

FIG. 6 is a plan view of an air-conditioned space showing a visual field range of a radiant heat temperature sensor.

FIG. 7 is a side view of an air-conditioned space showing a visual field range of a radiant heat temperature sensor.

FIG. 8 is a vertical cross-sectional view of part of the indoor unit.

FIG. 9 is a configuration diagram of a main part of a control circuit.

FIG. 10 is a plan view showing a rotation center and a rotation range of the left and right grills.

FIG. 11 is a flowchart for explaining wind direction control.

[Explanation of symbols]

2A, 2B ... Radiant heat detector, 6a ... First temperature sensor, 6
b ... 2nd temperature sensor, 15 ... Air conditioner main body, 24 ... Left and right louvers, 30 ... Control part, 31 ... Left and right louver drive circuit.

Claims (3)

[Claims] 1. An air conditioner provided with a first temperature sensor for detecting a temperature at a first position in a room and a second temperature sensor for detecting a temperature at a second position in the room. From the detected temperatures Tr ₁ (0) and Tr ₂ (0) at the start of operation of the temperature sensor and the detected temperatures Tr ₁ (t) and Tr ₂ (t) after the start of operation, the detected temperature change of the first temperature sensor and the second Difference with temperature change detected by temperature sensor {Tr ₁ (0) −Tr
₁ (t) − [Tr ₂ (0) −Tr ₂ (t)]}, and when the temperature change difference obtained by the temperature change difference detecting means is greater than or equal to a first set value, If the difference between the detected temperature Tr ₁ (t) of the first temperature sensor and the detected temperature Tr ₂ (t) of the second temperature sensor is equal to or more than the second set value, the air conditioner blows out in a direction to mitigate the difference. An air conditioner provided with a wind direction changing means for changing the direction. 2. The air conditioner according to claim 1, wherein the first and second temperature sensors are radiant heat temperature sensors provided in the air conditioner main body so as to detect radiant heat temperatures in mutually different directions. An air conditioner characterized by. 3. The air conditioner according to claim 1 or 2, wherein the wind direction changing means changes the blowing direction to the left and right by rotating the left and right louvers, and the position of the center of rotation of the left and right louvers is set to the left and right. An air conditioner including a left and right louver drive circuit that changes the direction and rotates the left and right louvers within a predetermined range in that state.