JPH0650595A - Air conditioner - Google Patents

Abstract

PURPOSE:To provide a comfortable air-conditioned space where a user does not feel uncomfortable by airstream by a method wherein when a person detecting means detects a person, amount of air to be sent is increased and decreased intermittently, while when it does not detect a person, the air amount is increased. CONSTITUTION:A control part 42 determines, based on an input signal from an ultrared ray sensor 49, whether a user exists in a room. If the determination is positive, the control part 42 controls an amountof air to be sent by a room fan 37 to increase and decrease intermittently, while the amount of air is kept in the middle range. By this, air of high temperature which tends to remain in the vicinity of a ceiling by buoyancy is made to go down along wall surfaces into a living area, so that the room can be heated downward gradually from the vicinity of the ceiling. At this time, diffused air from the room fan 37 is prevented from hitting the user directly. On the other hand, when the determination is negative, the control part 42 controls the room fan 37 to carry out an operation at a low temperature and with a large amount of wind to stir the air in the room. By this, the room inside is heated not only in the vicinity of the ceiling but also in the vicinity of a floor, whereby comfortability can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for performing air conditioning by blowing air, which has been heat-exchanged by an indoor heat exchanger, into a room by blowing means.

[0002]

2. Description of the Related Art A conventional heat pump type air conditioner used for heating and cooling will be described with reference to a refrigeration cycle configuration diagram of FIG. 20 and a sectional view of an indoor unit of FIG. The refrigeration cycle configuration will be described in the order in which the refrigerant flows during heating. A compressor 1 that compresses and discharges the refrigerant, a four-way valve 3 that switches the flow direction of the refrigerant between heating and cooling, a condenser during heating and evaporation during cooling. An indoor heat exchanger 5 serving as a heat exchanger, an expansion valve 7 that reduces the pressure of the liquid refrigerant to a state where it is easily vaporized, and an outdoor heat exchanger 9 serving as an evaporator during heating and a condenser during cooling.

In such a refrigeration cycle configuration, the heat of condensation of the refrigerant gas compressed by the compressor 1 and the heat of vaporization of the refrigerant expanded to a low temperature and low pressure by the expansion valve 7 are used for heating and cooling. During the heating operation, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is condensed by cooling in the indoor heat exchanger 5, and the expansion valve 7 expands the refrigerant expanded to a low-temperature and low-pressure state in the outdoor heat exchanger 9 to the outside air. After being evaporated by the endotherm from
A cycle of being sucked into the compressor 1 is formed. During the cooling operation, the four-way valve 3 is switched, the refrigerant gas from the compressor 1 is condensed by the outdoor heat exchanger 9, expanded by the expansion valve 7, and then evaporated by the indoor heat exchanger 5.

The indoor heat exchanger 5 is, as shown in FIG.
It is housed in an indoor unit 13 attached to a wall 11 at the upper part of the room. An indoor fan 15 is provided behind the indoor heat exchanger 5.
By the operation of the fan 15, the indoor air is taken into the indoor unit 13 from the air inlets 17 and 19 at the upper part or the front part of the indoor unit. The air taken in is
The heat is exchanged with the refrigerant by passing through the indoor heat exchanger 5, and is blown out into the room from the air outlet 21 at the lower part of the indoor unit. The air outlet 21 has a louver 2 for changing the blowing direction.
3 is provided. On the other hand, the outdoor heat exchanger 9 is the compressor 1
It is housed in an outdoor unit not shown together with the above, and is provided with an outdoor fan 25. Further, the compressor 1 has a drive power source frequency varying device 2 so that the driving ability can be changed according to the indoor temperature.
Equipped with 7.

[0005]

By the way, when the heating operation is considered in such an air conditioner,
In order to increase the operating capacity, control such as increasing the condensing temperature of the indoor heat exchanger to increase the blowing temperature or increasing the amount of indoor air blowing can be considered.

However, during the heating operation, even if the blowing temperature is increased, the warmed air rises due to the influence of buoyancy and tends to stay near the ceiling as shown in FIG. It is difficult to satisfy the users in the room, and when the amount of air blown from the indoor unit is increased, the heating capacity increases, but the temperature of the blown air decreases, so a large amount of cold air directly hits the user. On the contrary, there is a problem that comfort is reduced.

Therefore, in the conventional indoor unit of the air conditioner, in order to increase the heating capacity at the time of heating start-up, the amount of air blown out is increased, and almost all of the indoor unit is prevented from hitting the user with low-temperature, high-speed air blowout. When air is blown directly downwards and the indoor temperature approaches the set temperature, the compressor rotation speed is reduced, the heating capacity is reduced, and the air flow rate of the indoor unit is reduced. I am trying to blow it out.

However, in recent years, indoor units are designed to have a small height and a large width due to installation restrictions. An indoor unit with this design has a smaller opening area for the air outlet than the conventional design. large. For this reason, in heating operation near the set temperature, the blowing air speed is small when the air volume is low, and the indoor air causes a so-called short circuit,
The warm air does not reach the user or the vicinity of the floor, and the temperature distribution in the room becomes uneven, making it difficult to achieve a comfortable air-conditioned space.

Therefore, an object of the present invention is to provide a comfortable air-conditioned space without causing the user to feel uncomfortable due to the air flow.

[0010]

In order to achieve the above-mentioned object, the present invention firstly blows air, which has been heat-exchanged by an indoor heat exchanger, upward from an air outlet provided in an indoor unit. And a human body detecting means for detecting a human body existing in the air-conditioned space, and when the human body detecting means detects a human body, intermittently increases or decreases the amount of air blown by the air blowing means, while not detecting the human body And a control means for controlling to increase the amount of air blown by the air blower.

Secondly, the first indoor unit is provided with a blowing means for blowing upward the air that has been heat-exchanged by the indoor heat exchanger from the air outlet, and heat is exchanged by the indoor heat exchanger from the air outlet. A second indoor unit having a blowing unit that blows the generated air forward or downward, a human body detecting unit that detects a human body existing in the air-conditioned space, and when the human body detecting unit detects a human body, The amount of air blown by the air blower of the first indoor unit is intermittently increased and decreased, while the amount of air blown by the air blower of the second indoor unit is reduced, while the air blows by the first and second indoor units are detected when no human body is detected. And a control means for controlling to increase the amount of air blown by the means.

Third, from the air outlet provided in the indoor unit,
An air blower that blows forward the air that has been heat-exchanged by the indoor heat exchanger, a human body detector that detects the human body in the air-conditioned space, and a reduced amount of air blown when the human body detector detects the human body. On the other hand, when the human body is not detected, it is configured to have control means for controlling to increase the amount of air blown by the air blower.

Fourth, from the air outlet provided in the indoor unit,
A first blower that blows upward the air that has been heat-exchanged by the indoor heat exchanger; and a second blower that is provided separately from the indoor unit and that can blow the air in the air-conditioned space upward. And a control unit that controls the second air blowing unit to operate when the first air blowing unit is operating.

Fifth, from the air outlet provided in the indoor unit,
A first air blowing unit that blows upwardly the air that has been heat-exchanged by the indoor heat exchanger, and a second air blowing unit that blows air in the air-conditioned space upward from an air outlet provided in the indoor unit.
The blower unit and the control unit that controls the operations of the first and second blower units when the indoor unit is operating are configured.

[0015]

According to the first configuration, when the human body detecting means detects the human body in the air-conditioned space, the air blowing means intermittently increases or decreases the air blowing amount of the air heat-exchanged by the indoor heat exchanger. In this state, the air is blown upward from the air outlet, and when the human body is not detected, the amount of air blown by the air blower is increased.

According to the second structure, when the human body detecting means detects the human body in the air-conditioned space, the air blowing means of the first indoor unit intermittently changes the air blowing amount of the air heat-exchanged by the indoor heat exchanger. The air is blown upward from the air outlet in a state of being increased or decreased, and the air blowing means of the second indoor unit reduces the air blowing amount. On the other hand, when the human body is not detected, the air blowing means of the first and second indoor units Increases the air flow.

According to the third configuration, when the human body detecting means detects the human body in the air-conditioned space, the air blowing means reduces the air blowing amount of the air heat-exchanged by the indoor heat exchanger. The air is blown forward from the air outlet, and when the human body is not detected, the amount of air blown by the air blower is increased.

According to the fourth configuration, the first unit in the indoor unit
When the air blower blows the air, which has been heat-exchanged by the indoor heat exchanger, upward from the air outlet, the second air blower provided separately from the indoor unit also operates to move upward in the air-conditioned space. Air is blown, and the air blown by the first blower is agitated.

According to the fifth configuration, the first unit in the indoor unit
The blower unit blows the air, which has been heat-exchanged by the indoor heat exchanger, upward from the air outlet, and at this time, the second blower unit also operates to upwardly blow the air in the air-conditioned space to the air outlet. When the air is blown from the air, the air blown by the first blowing means is agitated.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show a first embodiment of the present invention. FIG. 1 is a cross-sectional view of an indoor unit 31 in a heat pump type air conditioner. The indoor unit 31 is attached to a wall 33 at the upper part of the room which is an air-conditioned space. An indoor heat exchanger 35 that exchanges heat between the refrigerant and the indoor air is housed in the indoor unit 31. Indoor heat exchanger 35
An indoor fan 37 as a blower is provided behind the indoor fan 37, and the operation of the indoor fan 37 allows indoor air to be taken into the indoor unit 31 from the air inlets 39 and 41 at the front or lower part of the indoor unit. The taken-in air exchanges heat with the refrigerant as it passes through the indoor heat exchanger 35, and is blown out from the air outlet 43 in the upper part of the indoor unit toward the ceiling in the upper part of the room. The air outlet 43 is provided with a louver 45 for changing the blowing direction.

FIG. 2 is a block diagram of a control circuit in the air conditioner having the indoor unit 31 shown in FIG. Indoor fan 37
The operation is controlled by the control unit 42 as a control means. The control unit 42 includes an indoor temperature sensor 45 for detecting the indoor temperature, a heat exchange temperature sensor 47 for detecting the temperature of the indoor heat exchanger 35, and the indoor unit. Each detection signal of the infrared sensor 49 as a human body detecting means for detecting an existing human body is input. The control unit 42 receives the detection signals from these sensors and controls the indoor fan 37 and the drive power source frequency varying device 51 that changes the operating capacity of the compressor (not shown).

Next, the control operation during the heating operation in such an air conditioner will be described with reference to the time chart of FIG. 3 and FIG.
This will be described with reference to the flowchart of FIG.

First, when the difference between the indoor set temperature and the actual indoor temperature is larger than the preset temperature range H set at the start-up of the operation, that is, "set temperature range H <set temperature-indoor temperature". In this case (step 401), the compressor is operated at the maximum rotation speed to maximize the heating capacity, and the amount of air blown by the indoor fan 37 is maximized to blow out toward the upper part of the room (step 402). The slightly cold air blown out warms the entire room while warming the ceiling surface and wall surfaces. The ventilation and temperature distribution in the room at this time are as shown in FIG. At this time, even if the user is present in the room, since the air is blown toward the upper part of the room, the low temperature and large air volume do not directly hit the user, so that there is no discomfort to the user.

If it is determined in step 401 that "set temperature range H≥set temperature-indoor temperature", it is determined whether the indoor temperature exceeds the set temperature, that is, "set temperature-indoor temperature>0". Is determined (step 403),
In the case of "set temperature-indoor temperature ≤ 0 indoor temperature", the indoor temperature is sufficiently high and the heating operation is stopped (step 40).
4).

When the difference between the indoor set temperature and the actual indoor temperature is less than or equal to the set temperature width H and the indoor temperature has not reached the set temperature, that is, "set temperature width H≥set temperature-indoor temperature>0". In this case (step 405), it is determined by the signal input from the infrared sensor 49 whether or not the user is present in the room (step 407). Here, if it is determined that there is user at time t ₁ is intermittently increases or decreases while a moderate blowing amount at time t ₁ (step 409). The blown state and temperature distribution in the room at this time are as shown in FIG. The heating capacity, that is, the number of revolutions of the compressor is appropriately reduced depending on the difference from the set temperature. By intermittently increasing or decreasing the amount of air blown, the high temperature air that tends to accumulate near the ceiling due to buoyancy is pushed down along the wall surface to the lower residential area. As a result, the room is warmed from the vicinity of the ceiling without the blown air directly hitting the user. Further, even if the room temperature is low due to the radiation from the ceiling, the user can feel warm.

[0027] In step 407, if it is determined that there is no user in the room at the time t _2, similarly to the step 402, performs the operation at time t ₂ a low temperature, with a large volume (step 411) and stir the room air. In this case, the heating capacity is equivalent to that when there is a user after the time t ₁ . This further warms up to the floor and improves comfort. Since there are no users, noise due to large air volume operation does not pose a problem. The blown state and temperature distribution in the room at this time are as shown in FIG.

In steps 409 and 411, when the state in which the user exists and the state in which the user does not exist continue (steps 413 and 415), the operating state is kept as it is until the room temperature reaches the set temperature. Continue (steps 417, 419). On the contrary, when the state in which the user is present and the state in which the user is not present are changed (steps 413 and 415), the operating state is changed to the large air flow rate operation during the intermittent air flow operation and the intermittent air flow operation during the large air volume operation. And drive according to the presence or absence of a user.
When the room temperature reaches the set temperature (step 41
7, 419) and the operation is stopped (step 404).

By carrying out such control, even in an indoor unit having a large opening area of the air outlet, it is possible to prevent a short circuit of the indoor air when the air velocity is small and the air volume is low, and the user and the floor are prevented. Warm air can be spread to the vicinity of the surface, the temperature distribution in the room is made uniform, and a comfortable air-conditioned space is realized.

6 to 9 show a second embodiment of the present invention.

The air conditioner of this embodiment has the circuit configuration of FIG. 2 in the first embodiment and the first indoor unit 52 of the same structure as FIG. 1, and the second indoor unit 52 having the circuit configuration of FIG. The indoor unit 53 and the indoor unit 53 are attached to the upper wall of the room at positions facing each other. Similar to the conventional indoor unit shown in FIG. 21, the second indoor unit 53 is a general one having a blowout port provided in the lower part, and the circuit configuration is such that the louver 54 makes the air blowing direction forward or downward. 2, except that a louver drive mechanism 55 that can be changed is provided.

The control operation in the heating operation in such an air conditioner will be described with reference to the time chart of FIG. 7, the flowchart of FIG. 8 and the indoor air blowing and temperature distribution chart of FIG.

First, when the difference between the indoor set temperature and the actual indoor temperature is larger than the preset set temperature width H at the start-up of the operation, that is, "set temperature width H <set temperature-indoor temperature". Sometimes (step 801), the compressor is operated at the maximum speed to maximize the heating capacity,
The amount of air blown by the indoor fan 37 is maximized in both the second indoor units 52 and 53. At this time, the first indoor unit 52 blows air toward the upper portion, and the second indoor unit 53 blows air toward the lower portion with the louver 54 facing downward (step 802). The air of a slightly low temperature blown out from the two indoor units 52, 53 follows the ceiling surface, the wall surface, and the floor surface, and even if the user is in the center of the room, the user is directly exposed to the low-temperature air. Without
Warm the entire room while warming the ceiling, walls, and floor. The ventilation and temperature distribution inside the room at this time are shown in FIG.
It becomes like (a).

If it is judged in the step 801 that "set temperature range H≥set temperature-indoor temperature", whether the indoor temperature exceeds the set temperature, that is, "set temperature-indoor temperature>0". Is determined (step 803),
In the case of "set temperature-indoor temperature ≤ 0 indoor temperature", the indoor temperature is sufficiently high, so the heating operation is stopped (step 80).
4).

When the difference between the indoor set temperature and the actual indoor temperature is less than or equal to the set temperature width H and the indoor temperature has not reached the set temperature, that is, "set temperature width H≥set temperature-indoor temperature>0". In that case (step 805), it is determined whether or not there is a user in the room by inputting a signal from the infrared sensor 49 (step 807). Here, if it is determined that there is user at time t _1, at time t _1, the first indoor unit 52, intermittently increased or decreased in a state in which a moderate air blowing amount, the second As for the indoor unit 53, the air is blown forward in a state where the air flow rate is reduced (step 80).
9). The ventilation and temperature distribution inside the room at this time are shown in FIG.
It becomes like (b). The heating capacity of both indoor units 52, 53
Both of them are appropriately reduced depending on the difference from the set temperature. By intermittently blowing hot air from the first indoor unit 52, high temperature air that tends to collect near the ceiling due to buoyancy is pushed down along the wall surface to the lower living area, and the room is warmed from near the ceiling. In addition, the user is exposed to the air having a high temperature and a relatively small wind speed and a feeling of high heating, and the comfort during heating is improved.

[0036] In step 807, if it is determined that there is no user in the room at the time t _2, the first, both the second indoor unit 52 and 53, at time t ₂ a low temperature, in air volume The operation is performed (step 911) and the room air is stirred. At this time, the first indoor unit 52 blows air toward the upper part,
The second indoor unit 53 blows air with the louver 54 facing forward.
In this case, the heating capacity is equivalent to that when there is a user after the time t ₁ . This further uniformly warms the entire room, further improving comfort. Since there are no users, noise due to large air volume operation does not pose a problem.
The ventilation and temperature distribution inside the room at this time are as shown in FIG.

When the presence or absence of the user continues in steps 809 and 911 (steps 913 and 915), the operating state is continued as it is until the indoor temperature reaches the set temperature. (Steps 917 and 919). On the contrary, when the state in which the user exists and the state in which the user does not exist change (step 913).
915), the operation state is changed to large air volume operation during intermittent and low air volume operation, and intermittent and low air volume operation during large air volume operation, and operation is performed according to the presence or absence of a user. Then, when the indoor temperature reaches the set temperature (steps 917 and 919), the operation is stopped (step 80).
4).

10 to 12 show a third embodiment of the present invention. The air conditioner of this embodiment has the circuit configuration of FIG. 6 in the second embodiment and has an indoor unit 57 similar to the conventional indoor unit shown in FIG. The indoor unit 57 is a general type having an air outlet in the lower portion, and is equipped with a louver drive mechanism 55 that can change the air blowing direction forward or downward by the louver 54.

The control operation in the heating operation in such an air conditioner will be described with reference to the time chart of FIG. 10, the flowchart of FIG. 11 and the indoor wind speed and temperature distribution chart of FIG.

First, when the difference between the indoor preset temperature and the actual indoor temperature is larger than the preset first preset temperature width H _{1 at the start of operation} , that is, "the first preset temperature width H ₁ <setting Temperature-indoor temperature "(step 11
01), the compressor is operated at the maximum rotation speed to maximize the heating capacity, and the amount of air blown by the indoor fan 37 is maximized and blown out toward the lower part of the room (step 110).
2). Even if the user is in the center of the room, the slightly low temperature air blown along the floor and wall surfaces does not hit the user directly with low temperature air, while warming the floor and wall surfaces throughout the room. Warm up. The ventilation and temperature distribution inside the room at this time are as shown in FIG.

If it is determined in step 1101 that "first set temperature range H ₁ ≥ set temperature-indoor temperature", the difference between the set temperature and the room temperature is the first set temperature range H ₁
Less than second predetermined temperature width H ₂ whether greater than, or "set temperature - room temperature> second set temperature range H _2" is judged (step 1103), "set temperature - room temperature ≦
In the case of the second set temperature range H ₂ "further if the room temperature exceeds the set temperature, or" set temperature - room temperature> 0 "is judged (step 1104)," set temperature - room temperature ≦ In the case of "0", the room temperature is sufficiently high, and the heating operation is stopped (step 1105).

The difference between the indoor set temperature and the actual room temperature is
When the first set temperature range H ₁ or less and the second set temperature range H ₂ are not reached, that is, when “the first set temperature range H ₁ ≧ set temperature−indoor temperature> second set temperature range H ₂ ” (Step 1106), it is determined whether or not the user is present in the room by inputting a signal from the infrared sensor 49 (step 1107).

[0043] Here, at the time t _1, when it is determined that the user is present, is blown in a state of a moderate air blowing amount to forward the louver 54 at time t ₁ (step 1109). The ventilation and temperature distribution in the room at this time are
It becomes like FIG.12 (b). The heating capacity is appropriately reduced depending on the difference with the set temperature. By performing such driving,
Air with a relatively low wind velocity and a relatively high temperature blows out toward the user in front of the indoor unit, which gives the indoor user a feeling of high heating with a relatively low wind velocity, improving comfort during heating. To do.

On the other hand, at step 1107, time t ₂
When it is determined that there is no user in the room,
At time t _{2, the} louver 54 is turned forward and operated with a large air volume (step 1111) to stir room air. Even if a large air volume operation is performed, noise does not become a problem because there is no user. At this time, the heating capacity is appropriately reduced due to the difference with the set temperature. The ventilation and temperature distribution inside the room at this time are as shown in FIG.

In steps 1109 and 1111, when the state in which the user exists and the state in which the user does not exist continue (steps 1113 and 1115), the operating state is kept as it is, the room temperature does not reach the set temperature, And the difference between the indoor temperature and the set temperature is the second set temperature width H ₂ or less, that is, “the second set temperature width H ₂ ≧ set temperature−indoor temperature> 0”.
It continues until it becomes (steps 1117 and 1119).
On the contrary, when the state in which the user is present and the state in which the user is not present are changed (steps 1113 and 1115), the operating state is changed to the large air volume operation during the medium air volume operation and the medium air volume operation during the large air volume operation. And drive according to the presence or absence of a user.

After that, at time t _{3, the} "second set temperature range H
₂ ≧ set temperature−indoor temperature> 0 ”, it is determined whether or not there is a user (step 1121). If there is a user, the louver 54 is kept forward and the air flow rate is further reduced. To blow air (step 112)
3). The ventilation and temperature distribution inside the room at this time are shown in FIG.
It becomes like (d). The heating capacity is appropriately reduced depending on the difference with the set temperature. The heating capacity becomes smaller and the hot air blows out toward the front of the indoor unit, but the amount of air blown is also reduced, so the air does not hit the user directly and the indoor air is heated further until it reaches the set temperature. To be Step 1
If it is determined in 121 that the user does not exist,
The operation is performed with a large air volume (step 1125), the room air is stirred, and the entire room is further warmed.

If it is determined in steps 1123 and 1125 that the user is present and the user is not present (steps 1127 and 1129), the operating state is continued until the room temperature reaches the set temperature. (Steps 1131 and 1133). On the contrary, when the state in which the user is present and the state in which the user is not present are changed (steps 1127 and 1129), the operating state is changed to the large air volume operation during the low air volume operation and the low air volume operation during the large air volume operation. And drive according to the presence or absence of a user. Then, when the indoor temperature reaches the set temperature (steps 1131 and 1133), the operation is stopped (step 11).
05).

13 and 14 show a fourth embodiment of the present invention. The indoor unit 59 of the air-conditioning apparatus in this embodiment has an air outlet 4 at the top as in the installation example shown in FIG. 13, as in the first embodiment shown in FIG.
3 and is attached to the wall 33 at the upper part of the room. A blower 63, which is operated to blow air upward in the room, is attached to a wall 61 at the upper part of the room facing the indoor unit 59. The blower 63 receives a signal input from the indoor unit 59 using a wire wire or infrared rays, and is operated during the heating operation of the indoor unit 59.

In the air conditioner having such a structure,
When the indoor unit 59 is heated, the blower 63 that receives a signal input from the indoor unit 59 also starts operating. The warm air blown from the indoor unit 59 travels along the ceiling as shown in FIG. 14, and the indoor air is blown from the blower 63 so as to face the ceiling, and the warm air near the ceiling is agitated. By this stirring action, warm air near the ceiling reaches near the floor surface, and the temperature difference in the vertical direction is reduced, and the indoor temperature is made uniform.
Further, the effect of radiation from the ceiling surface and the fact that there is almost no air flow near the floor surface allows the user to feel comfortable even at a slightly low air temperature.

The blower 63 may be attached to the left and right side walls of the indoor unit 59, but when attached to the wall 61 facing the indoor unit 59, the warm air is most effectively agitated to near the floor surface. be able to. Furthermore, blower 6
By adopting a structure in which the air is blown while swinging in the left-right direction, the effect of stirring the indoor air is increased, and the temperature distribution in the vertical direction of the room is reduced, and a comfortable heating space can be realized. .

15 to 19 show a fifth embodiment of the present invention. As shown in FIG. 15, the indoor unit 65 of the air conditioner in this embodiment has an air outlet 6 at the top.
7, the indoor heat exchanger 69 and the indoor fan 71 as the first air blower are provided with an air blower fan 73 as the second air blower at one end side. A cross flow fan is used for the indoor fan 71, and a turbo fan is used for the blower fan 73. An opening 75 is formed below the blower fan 73, and the air taken in from the opening 75 by the operation of the blower fan 71 is blown out from the upper air outlet 67. FIG. 16 is a control circuit configuration diagram. The circuit configuration is the same as that of FIG. 2 except that a blower fan 73 is added.

The control operation in the heating operation in such an air conditioner will be described with reference to the time chart of FIG. 17, the flowchart of FIG. 18 and the indoor air velocity and temperature distribution chart of FIG.

First, when the difference between the indoor set temperature and the actual indoor temperature is larger than the preset temperature range H (step 1801) at the start-up of operation, heat is exchanged by the indoor heat exchanger 69. The indoor fan 71 blows air upward from the air outlet 67 with a large amount of air, and the rotation speed of the compressor is also set to be high to obtain the maximum heating capacity (step 1803). In this case, the blowing temperature is rather low because of the large amount of air blown, but the entire room is warmed while warming the ceiling surface and wall surfaces. The ventilation and temperature distribution inside the room at this time are as shown in FIG.

When the room temperature rises and the difference between the room set temperature and the actual room temperature becomes equal to or less than the set temperature width H at time t ₁ , the amount of air blown by the indoor fan 71 is set to the required heating capacity. Decrease stepwise with decrease (step 180)
5). Next, the infrared sensor 49 determines whether or not there is a user in the room (step 1807). When the user exists, the blower fan 73 blows the indoor air intermittently (step 1809). Warm air staying near the ceiling is agitated and heated to near the floor.

Generally, noise is a problem for a fan having an air volume that can stir the room, but by operating intermittently, the discomfort caused by the noise can be reduced. Also, considering that the wall-mounted indoor unit, which conventionally used a downward-facing crossflow fan to blow air, could not reduce the wind speed below a certain limit in order to reach warm air near the floor surface. In this embodiment, the indoor fan 7
Since it is possible to reduce the air flow rate of 1 to a level where noise is not a concern, it is possible to perform air conditioning with low noise as a whole.

When it is determined in step 1807 that there is no user at time t ₂ , the blower fan 73 continuously agitates the room air (step 1811).
Since it is not necessary to consider the adverse effect of noise, the stirring time can be extended and the temperature difference in the vertical direction in the room can be made smaller. The amount of air blown by the indoor fan 71 is
As with intermittent operation, the heating capacity is reduced as the required heating capacity decreases.

If it is determined in steps 1809 and 1811 that the user is present and the user is not present (steps 1813 and 1815), the operating state is continued until the room temperature reaches the set temperature. (Steps 1817 and 1819). On the contrary, when the state in which the user exists and the state in which the user does not exist change (steps 1813 and 1815), the operating state is changed to continuous operation during intermittent operation, and intermittent operation during continuous operation. Operate according to the presence or absence of. When the room temperature reaches the set temperature (step 181)
7, 1819), the compressor is stopped at time t ₃ , and the blow of the indoor fan 71 is also stopped.
In step 3, the air is blown intermittently (step 1821) and the stirring of the room air is continued.

FIG. 19B shows the air velocity and temperature distribution inside the room due to the agitation by the blower fan 73. It can be seen that the temperature difference in the vertical direction is smaller than that in FIG. 19A due to the stirring effect. Also, because of the effect of radiation from the ceiling and almost no airflow near the floor,
A heating space that feels comfortable even at a lower air temperature can be realized.

[0059]

As described above, according to the first aspect of the present invention, when the user is present in the air-conditioned space, the air outlet at the upper part of the indoor unit is intermittently increased and decreased. The air is blown from the air, and when the user is not present, the air is blown with the increased air flow, so that the user does not feel uncomfortable due to the air flow, and a more comfortable air-conditioned space can be obtained.

According to the second aspect of the invention, when the user is present in the air-conditioned space, the air is blown intermittently from the air outlet of the upper part of the first indoor unit in a state where the amount of air blown is increased and decreased intermittently.
Since the amount of air blown by the first and second indoor units is increased when no user is present, a more comfortable air-conditioned space can be obtained without the user feeling uncomfortable due to the air flow.

According to the third invention, when the user is present in the air-conditioned space, air is blown forward from the air outlet while the air flow is reduced, and when there is no user, the air flow is reduced. Since the air flow is increased and the air is blown, a more comfortable air-conditioned space can be obtained without the user feeling uncomfortable due to the air flow.

According to the fourth invention, the first in the indoor unit
The blower blows the air, which has been heat-exchanged by the indoor heat exchanger, upward from the air outlet, and at the same time, the second blower provided separately from the indoor unit also operates to blow the indoor air upward. By blowing the air, the warm air blown by the first blowing means is agitated, whereby a more comfortable air-conditioned space can be obtained without the user feeling uncomfortable due to the air flow.

According to the fifth invention, the first in the indoor unit
The air blower blows the air, which has been heat-exchanged by the indoor heat exchanger, upward from the air outlet, and the second air blower also operates to blow the indoor air upward, and by the first air blower. Since the blown warm air is agitated, the user does not feel uncomfortable due to the air flow, and a more comfortable air-conditioned space can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an indoor unit according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a control circuit in the first embodiment of the present invention.

FIG. 3 is a time chart of the control operation in the first embodiment of the present invention.

FIG. 4 is a flowchart showing a control operation in the first embodiment of the present invention.

FIG. 5 is an air velocity and temperature distribution diagram in the room in the first embodiment of the present invention.

FIG. 6 is a control circuit configuration diagram according to a second embodiment of the present invention.

FIG. 7 is a time chart of the control operation in the second embodiment of the present invention.

FIG. 8 is a flowchart showing a control operation in the second embodiment of the present invention.

FIG. 9 is an indoor air velocity and temperature distribution diagram in the second embodiment of the present invention.

FIG. 10 is a time chart of the control operation in the third embodiment of the present invention.

FIG. 11 is a flowchart showing a control operation in the third embodiment of the present invention.

FIG. 12 is an indoor air velocity and temperature distribution diagram in the third embodiment of the present invention.

FIG. 13 is a perspective view showing an installation example of an indoor unit and a blower in a fourth embodiment of the present invention.

FIG. 14 is an indoor air velocity and temperature distribution diagram in the fourth embodiment of the present invention.

FIG. 15 is a perspective view of an indoor unit according to a fifth embodiment of the present invention.

FIG. 16 is a control circuit configuration diagram according to the fifth embodiment of the present invention.

FIG. 17 is a time chart of the control operation in the fifth embodiment of the invention.

FIG. 18 is a flowchart showing a control operation in the fifth embodiment of the present invention.

FIG. 19 is an indoor air velocity and temperature distribution diagram in the fifth embodiment of the present invention.

FIG. 20 is a refrigeration cycle configuration diagram of an air conditioner showing a conventional example.

FIG. 21 is a sectional view of an indoor unit showing a conventional example.

FIG. 22 is an indoor wind velocity and temperature distribution diagram showing a conventional example.

[Explanation of symbols]

 31, 57, 59, 65 Indoor unit 35, 69 Indoor heat exchanger 37, 71 Indoor fan (blowing means) 42 Control section (control means) 43, 67 Air blowout port 49 Infrared sensor (human body detection means) 52 First room Machine 53 Second Indoor Unit 63 Blower (Second Blower Means) 71 Indoor Fan (First Blower Means) 73 Blower Fan (Second Blower Means)

Claims (5)

[Claims] 1. An air blower for blowing upward air that has undergone heat exchange by an indoor heat exchanger from an air outlet provided in an indoor unit, and a human body detector for detecting a human body present in an air-conditioned space. When the human body detecting unit detects a human body, the air blowing amount by the air blowing unit is intermittently increased and decreased, and when the human body is not detected, the air blowing amount by the air blowing unit is controlled to increase. Air conditioner. 2. A first indoor unit having a blower unit for blowing upwardly the air that has been heat-exchanged by the indoor heat exchanger from the air outlet, and heat is exchanged by the indoor heat exchanger from the air outlet. A second indoor unit having a blowing unit that blows air forward or downward, a human body detecting unit that detects a human body existing in the air-conditioned space, and the first body when the human body detecting unit detects the human body. While the amount of air blown by the air blower of the indoor unit is intermittently increased and decreased, and the amount of air blown by the air blower of the second indoor unit is reduced, when the human body is not detected, the air blower of each of the first and second indoor units is used. An air conditioner comprising: a control unit that controls to increase the air flow rate. 3. An air blowing means for blowing forward the air, which has been heat-exchanged by the indoor heat exchanger, from an air outlet provided in the indoor unit, and a human body detecting means for detecting a human body existing in the air-conditioned space. An air conditioner comprising: a control means for controlling the human body detecting means so as to reduce the air flow rate when the human body is detected, and to increase the air flow rate by the air blowing means when the human body is not detected. 4. A first blower for blowing upward air, which has been heat-exchanged by an indoor heat exchanger, from an air outlet provided in the indoor unit, and an air-conditioned space provided separately from the indoor unit. Second blowing means capable of blowing the above air upwards,
An air conditioner comprising: a control unit that controls the second air blowing unit to operate when the first air blowing unit is in operation. 5. A first blower for blowing upward air, which has been heat-exchanged by an indoor heat exchanger, from an air outlet provided in the indoor unit, and an air outlet provided in the indoor unit,
An air conditioner comprising: a second blower that blows air in the air-conditioned space upward; and a controller that controls the operation of the first and second blowers when the indoor unit is operating. apparatus.