JP3144834B2 - Air conditioner - Google Patents

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 controlling an ability to maintain a constant blowing temperature.

[0002]

2. Description of the Related Art As a conventional air conditioner for performing constant blow-off temperature control, there is one disclosed in Japanese Patent Application Laid-Open No. 2-122138.

[0003] Hereinafter, an air conditioner that performs the above-described conventional blow-out temperature constant control will be described with reference to the drawings. FIG.
Is a schematic configuration diagram showing a conventional air conditioner, 1 is a duct type indoor unit main body, and detects the temperature of air blown out by the indoor heat exchanger 2, the indoor blower 3, and the indoor blower 3 therein. And a blowout temperature detector 4 for detecting the temperature. Reference numeral 5 denotes an outdoor unit main body, in which a variable capacity compressor 6, an outdoor heat exchanger 7,
An outdoor blower 8 and a compressor controller 9 for controlling the performance of the compressor 6 are provided.

A duct 11 connects the indoor unit main body 1 to the room to be air-conditioned 10, and guides warm air or cold air to the room to be air-conditioned 10. A variable air volume unit 12 is provided in the middle of the duct 11 to control the room temperature of the room to be air-conditioned 10 by changing the air volume. A return duct 13 guides air from the room to be air-conditioned 10 to the indoor unit main body 1. Reference numeral 14 denotes an intake duct, and 15 denotes an exhaust duct. Each of the air supply duct 14 and the exhaust duct 15 has fans 14a and 15a as supply and exhaust devices in the middle of the duct, and exhausts a part of the air in the return duct 13. At the same time, outside air is supplied to ventilate the conditioned room 10.

Reference numeral 16 denotes an air volume control device of the variable air volume unit 12, which is detected by a room temperature detector 19 and a set room temperature T ₀ set by a room temperature setter 18 provided in a room temperature controller 17 in the room to be air-conditioned. The damper (not shown) and the motor (not shown) in the variable air volume unit 12 are controlled based on the difference from the room temperature T ₁ to control the air volume passing through the duct 11.

[0006] The operation of the air conditioner configured as described above, which performs the blow-off temperature constant control, during cooling will be described below with reference to FIG.

The difference (step a) between the set room temperature T ₀ set by the room temperature setting unit 18 in the room temperature controller 17 and the room temperature T ₁ detected by the room temperature detector 19 is T ₁ −T ₀ at the time of cooling and heating. > 0, the air flow control device 1 increases the air flow in the duct 11
6 controls the variable unit 12 (step b). Conversely, when T ₁ −T ₀ <0, control is performed to reduce the air volume in the duct 11 (step c).

At this time, in order to secure the ventilation air volume of the room to be air-conditioned 10, the variable air volume unit 12 does not reduce the air volume passing through the duct 11 at least to a predetermined air volume. Thus, the amount of air passing through the duct 11 changes,
The compressor controller 9 varies the capacity of the compressor 6 so that the blowout temperature detected by the blowout temperature detector 4 in the indoor unit main body 1 is always constant (step d).

As described above, air is always blown from the indoor unit main body 1 at a constant blowing temperature, and the air volume supplied to the air-conditioned room 10 is changed by the variable air volume unit 12 to air-condition the air-conditioned room 10. It is.

[0010]

However, in the above-mentioned conventional structure, even if the air-conditioning load of the room to be air-conditioned decreases, the supply air volume cannot be reduced below a certain air volume in order to secure the ventilation air volume. However, there is a disadvantage that the room to be air-conditioned is too cold, and when heated, it is too warm, that is, the performance of the air conditioner does not decrease.

According to the present invention, when the air-conditioning load of the room to be air-conditioned is reduced, the air-conditioned room is not cooled too much during cooling or overheated during heating to secure a ventilation air volume and maintain a comfortable indoor environment. Aim.

[0012]

In order to achieve the above object, in the air conditioner of the present invention, a static pressure setter for setting a static pressure in a duct between a variable air volume unit and an indoor unit main body is provided. A static pressure setting device for setting a static pressure in the duct between the variable air volume unit and the indoor unit main body, and the static pressure detected by the static pressure detector matches the static pressure set by the static pressure setting device. A blower controller for controlling the number of revolutions of the indoor-side blower, a blower temperature detector for detecting a temperature of blown air from the indoor unit body, a compressor control device for controlling operation of the compressor, and the compressor control And a CPU for controlling the container.

The CPU causes the compressor controller to control the capacity of the compressor so that the blown air temperature detected by the blowout temperature detector becomes a preset set temperature. When the controller operates the indoor-side blower at a predetermined number of revolutions or less, a control is performed such that the set temperature of the blow-out air temperature is increased by a predetermined value during a cooling operation and is decreased by a predetermined value during a heating operation. .

In another air conditioner of the present invention, a CPU
Controlling the compressor controller to control the capacity of the compressor so that the blow-off air temperature detected by the blow-out temperature detector becomes a preset set temperature, and the number of rotations of the indoor side blower is increased. When the rotation speed is lower than the first rotation speed set higher than the rotation speed corresponding to the minimum supply air volume for ventilation, the set temperature of the blown air temperature is increased by a predetermined value during cooling operation, decreased by a predetermined value during heating operation, and When the number of revolutions of the indoor side blower is higher than a second predetermined number of revolutions set lower than the number of revolutions corresponding to the maximum supply air volume, the set temperature of the blown air temperature is lowered by a predetermined value during cooling operation, and during heating operation. It is configured to perform control for increasing a predetermined value.

[0015]

According to the air conditioner of the present invention, when the air-conditioning load of the room to be air-conditioned is reduced, the air volume passing through the duct is reduced by the variable air volume unit, and the variable air volume unit and the indoor unit main body are reduced by the reduced air volume passing through the duct. Since the static pressure in the duct during the period becomes higher than the set static pressure, the blower controller lowers the rotation speed of the indoor blower to reduce the static pressure in the duct between the variable air volume unit and the indoor unit body to the set static pressure. Try to match.

When the number of revolutions of the indoor blower falls below a predetermined number of revolutions set slightly higher than the number of revolutions necessary for securing the ventilation air volume, the CPU reduces the set temperature of the air blown from the indoor unit body to the cooling operation. At the same time, a predetermined value is increased (a predetermined value is reduced during the heating operation), and the compressor controller is caused to perform the capacity control (reduction of the capacity) of the compressor so that the temperature of the air blown from the indoor unit main body becomes the newly set temperature.

As a result, the temperature of the air blown out of the indoor unit increases by a predetermined value during the cooling operation (decreases by the predetermined value during the heating operation), the air-conditioning load of the room to be air-conditioned increases, and the airflow through the duct increases by the variable airflow unit. Since the static pressure in the duct between the variable air volume unit and the indoor unit body becomes lower than the set static pressure due to an increase in the air volume passing through the duct, the blower controller increases the rotational speed of the indoor blower to a predetermined rotational speed or more. is there.

According to another air conditioner of the present invention, when the air-conditioning load of the room to be air-conditioned is reduced, the air volume passing through the duct is reduced by the variable air volume unit, and the air volume passing through the duct is reduced and the variable air volume unit is connected to the room. Since the static pressure in the duct between the unit and the main unit is higher than the set static pressure, the blower controller sets the static pressure in the duct between the variable air volume unit and the indoor unit by reducing the rotation speed of the indoor fan. Try to match static pressure.

When the number of revolutions of the indoor blower becomes lower than a first predetermined number of revolutions set higher than the number of revolutions corresponding to the minimum supply air volume for ventilation, the CPU sets the set temperature of the air blown from the indoor unit body. Is increased by a predetermined value during cooling operation (decreased by a predetermined value during heating operation), and the compressor controller controls the capacity of the compressor (decreases the capacity) so that the temperature of the air blown out from the indoor unit body becomes the newly set temperature. Let it do.

As a result, the temperature of the air blown from the indoor unit increases by a predetermined value during the cooling operation (decreases by a predetermined value during the heating operation), the air-conditioning load of the room to be air-conditioned increases, and the airflow through the duct increases by the variable airflow unit. Since the static air pressure in the duct between the variable air volume unit and the indoor unit body becomes lower than the set static pressure due to the increase in the air volume passing through the duct, the blower controller sets the rotational speed of the indoor blower to a first predetermined rotational speed or more. Raise it.

As described above, the air conditioner of the present invention can reduce the performance of the air conditioner while securing the ventilation air volume, and can overcool the room to be air-conditioned during the cooling operation or overheat during the heating operation. And a comfortable indoor environment can be maintained.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an air conditioner according to the present invention will be described below with reference to the drawings. The same components as those of the prior art are denoted by the same reference numerals, and a detailed description thereof will be omitted. FIG. 1 is a schematic configuration diagram of a first embodiment of the present invention, FIG. 2 is a block diagram of the air conditioner of the embodiment, and FIG. 3 is a flowchart showing the operation of the air conditioner of the embodiment.

In FIG. 1, a duct type indoor unit main body 1 is shown.
Is an indoor heat exchanger 2, a rotational speed control type indoor blower 20, and a blower controller 2 for controlling the indoor blower 20.
1, an outlet temperature detector 4 is provided. Outdoor unit 5
Has a variable capacity compressor 6, an outdoor heat exchanger 7,
An outdoor blower 8 and a compressor controller 22 are provided. The duct 11 has a static pressure detector 23 for detecting the static pressure of the air blown from the indoor blower 20, and sets the static pressure of the air blown from the indoor blower 20 near the blower controller 21. The static pressure setting device 24 is provided.

In FIG. 2, reference numeral 25 denotes a CPU for controlling the air conditioner according to the present embodiment, which includes a set room temperature T ₀ internally set by a room temperature setter 18 and a room temperature T ₁ detected by a room temperature detector 19. , An outlet temperature setting unit 27 for setting the outlet temperature, an outlet temperature t ₁ detected by the outlet temperature detector 4 and a set outlet temperature t set by the outlet temperature setter 27. Blow-out temperature comparator 28 comparing with ₀
And a static pressure comparator 29 that compares the static pressure P ₀ set by the static pressure setting unit 24 with the static pressure P ₁ detected by the static pressure detector 23.
And a predetermined number of revolutions N ₀ of the indoor-side blower 20 (set slightly higher than a required number of revolutions to secure the ventilation air volume), and a predetermined number of revolutions N stored in the memory 30.
A rotation speed comparator 31 for comparing ₀ with the rotation speed N ₁ of the indoor blower 20 is built in.

The CPU 25 varies the air volume of the variable air volume unit 12 via the air volume controller 16 according to the comparison result of the room temperature comparator 26 and the operation mode detected by the operation mode detector 32, and compares the air pressure of the static pressure comparator 29. Based on the result, the rotation speed of the indoor-side blower 20 is controlled via the blower controller 21. Further, the capacity of the compressor 6 is changed via the compressor controller 22 according to the comparison result of the blowout temperature comparator 28 and the operation mode detected by the operation mode detector 32. Further, the set temperature of the blowout temperature setter 27 is changed according to the comparison result of the rotation speed comparator 31 and the operation mode detected by the operation mode detector 32.

Next, a specific example of this operation will be described with reference to the flowchart of FIG. 3 showing the operation during the cooling operation.

When the difference between the set room temperature T ₀ set by the room temperature setting unit 18 in the room temperature controller 17 and the room temperature T ₁ detected by the room temperature detector 19 is T ₁ −T ₀ > 0. The air volume control device 16 controls the variable air volume unit 12 so that the air volume in the duct 11 increases (step 1). Conversely, T ₁ −
If T ₀ <0, control is performed to reduce the air volume in the duct 11 (step 1).

At this time, in order to secure the ventilation air volume of the room to be air-conditioned 10, the variable air volume unit 12 does not reduce the air volume passing through the duct 11 at least below a preset air volume. When the amount of air passing through the duct 11 changes in this way,
The static pressure in the duct 11 changes. The blower controller 21 determines that the difference between the duct static pressure P ₁ detected by the static pressure detector 23 and the static pressure P ₀ set by the static pressure setting unit 24 is P ₁ -P during cooling.
_{When 0} > 0, the number of rotations of the indoor blower 20 is reduced and P ₁ −
If P ₀ <0, the rotation speed of the indoor-side blower 20 is increased (step 2).

At this time, when the rotation speed of the indoor side blower 20 becomes equal to or lower than the predetermined rotation speed N ₀ , the constant blow set temperature t ₀ is increased by a predetermined value during cooling and reduced by a predetermined value during heating (step 3).

The outlet temperature detector 4 in the indoor unit body 1
The compressor controller 22 controls the capacity of the compressor 6 so that the blow-out temperature detected at becomes a constant temperature t ₀ (step 4).

The air conditioner according to the first embodiment includes an air-conditioned room 1
When the air conditioning load of 0 is reduced, the variable air volume unit 12
As a result, the amount of air passing through the duct 11 decreases, and the amount of air passing through the duct 11 decreases, so that the static pressure P ₁ in the duct 11 between the variable air volume unit 12 and the indoor unit main body 1 becomes higher than the set static pressure P _0. controller 21 tries to match the set static pressure P ₀ the static pressure P ₁ in the duct 11 between the lower the rotational speed N ₁ and a variable air volume unit 12 and the indoor unit main body 1 of the indoor blower 20.

When the rotation speed N ₁ of the indoor blower 20 falls below a predetermined rotation speed N ₀ which is set slightly higher than the rotation speed required for securing the ventilation air volume, the CPU 25 outputs air blown from the indoor unit main body 1. the set temperature t ₀ cooling operation when a predetermined Raises (heating operation at a predetermined price reduction) Rutotomoni, indoor compressor controller 22 so that the temperature t ₀ of the temperature t ₁ is newly set in the air blown from the main body 1 Causes the compressor 6 to perform capacity control (capacity reduction).

As a result, the temperature t ₁ of the air blown from the indoor unit main body 1 rises by a predetermined value during the cooling operation (decreases by the predetermined value during the heating operation), the air-conditioning load of the room 10 to be conditioned increases, and the duct 11 Of the variable airflow unit 12 due to the increase of the airflow passing through the duct 11
Blower controller 21 for static pressure P ₁ in the duct 11 is lower than the set static pressure P ₀ between the indoor unit main body 1 and raises the rotational speed N ₁ of the indoor blower 20 to the predetermined rotational speed or more N ₀ It is.

When the rotation speed N ₁ of the indoor blower 20 becomes higher than the predetermined rotation speed N ₀ , the set temperature t _{0 of the} blown air.
Is returned to the original temperature.

As described above, the air conditioner of the first embodiment has the indoor blower 20 at the initial set temperature t ₀ of the blown air.
In the case of an air-conditioning load that can cope with a state where the number of rotations is higher than a predetermined number of rotations, supply air volume control is performed with a constant blow-off temperature. It is.

More specifically, assuming that the constant blow set temperature t ₀ during the cooling operation is 15 ° C., the constant blow set temperature t ₀ is set to 18 ° C. when the indoor blower 20 becomes a predetermined rotational speed N ₀ or less. Change. In this case, the maximum supply air volume 50 m ³ / min to the air conditioning chamber 10, air flow rate 25 m ³ / min, minimum supply air volume when the speed N ₀ of the indoor blower 20 (ventilation required air amount) is 20 m ³ / Assuming min, the constant blowing temperature t ₀ is 1
If the temperature remains at 5 ° C., the capacity can be reduced only to about 40%. If the cooling load of the room to be air-conditioned 10 becomes 40% or less, which is the above-mentioned problem, the room will be overcooled. . The rotation speed N of the indoor-side blower 20 as in this embodiment
_{When 1} becomes equal to or less than the set number of revolutions N ₀ , the constant blowing temperature t ₀
Is changed to 18 ° C., if the suction temperature of the indoor unit 1 becomes 2
At 6 ° C, 20 (26-18) / 50 (26-1)
5) The control from 0.29 to about 29% can be performed while securing the minimum air flow rate of 20 m ³ / min.

In the case of heating, as in the case of cooling,
The heating capacity control range can be expanded while ensuring the minimum air volume.

As described above, in the constant blowing temperature control, when the rotation speed N ₁ of the indoor-side blower 20 becomes equal to or less than the predetermined value N ₀ , the set temperature t ₀ of the blowing temperature is increased during cooling, predetermined value, and heating. By lowering the predetermined value, the capacity control range can be expanded while securing the minimum ventilation air volume.
Overheating can be prevented.

Next, a second embodiment of the air conditioner according to the present invention will be described with reference to the drawings. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. Omitted. FIG. 4 is a block diagram of an air conditioner according to a second embodiment of the present invention, and FIG. 5 is a flowchart showing the operation of the air conditioner of the second embodiment.

In FIG. 4, reference numeral 33 denotes a CPU for controlling the air conditioner of this embodiment, which is internally detected by a room temperature comparator 26, an air temperature setting device 34 for setting the air temperature, and an air temperature detector 4. the outlet temperature comparator 28 for comparing the setting blowing temperature t ₀ which is set at outlet temperature t ₁ and outlet temperature setter 34, the static pressure comparator 29, corresponding to the minimum supply air volume for ventilation storing a second predetermined rotational speed N _b which is set lower than the rotational speed of the indoor blower 20 corresponding to the first predetermined rotational speed N _a and the maximum supply air volume which is set to be higher than the rotational speed of the indoor blower 20 A storage device 35 and a rotation speed comparator 31 that compares the _first and second predetermined rotation speeds N _a and N _b stored in the storage device 35 with the rotation speed N ₁ of the indoor blower 20 are built in. .

The CPU 33 varies the air volume of the variable air volume unit 12 via the air volume control device 16 according to the comparison result of the room temperature comparator 26 and the operation mode detected by the operation mode detector 32, and compares the air pressure of the static pressure comparator 29. Based on the result, the rotation speed of the indoor-side blower 20 is controlled via the blower controller 21. The capacity of the compressor is changed according to the comparison result of the blow-out temperature comparator 28 and the operation mode detected by the operation mode detector 32. Further, the set temperature of the outlet temperature setting device 34 is changed according to the comparison result of the rotation speed comparator 36 and the operation mode detected by the operation mode detector 32.

The operation during the cooling operation of the air conditioner of the present embodiment configured as described above will be described with reference to the flowchart of FIG.

The set room temperature T set by the room temperature setting device 18
The difference between ₀ and the room temperature T ₁ detected by the room temperature detector is T ₁ −
When T ₀ > 0, the air volume control device 16 controls the variable air volume unit 12 to increase the air volume in the duct 11, and conversely, when T ₁ −T ₀ <0, reduces the air volume in the duct 11. (Step 5).

When the amount of air passing through the duct 11 changes, the static pressure inside the duct 11 changes. When the difference between the set static pressure P ₀ set by the static pressure setter 24 and the duct static pressure P ₁ detected by the static pressure detector 23 is P ₁ −P ₀ > 0, the blower control device 21 sets the room The rotation speed of the inner blower 20 is reduced, and P ₁ -P ₀
If <0, the blower control device 21 increases the rotation speed of the indoor blower 20 (step 6).

The first predetermined rotation speed N stored in the storage 35
_a , the second predetermined rotation speed _Nb and the rotation speed N ₁ of the indoor side blower 20
If the relationship is N ₁ −N _a <0, the outlet set temperature t ₀ set by the outlet temperature setter 34 is increased by 3 ° C. and N ₁
If −N _b > 0, the set blowout temperature t ₀ set by the blowout temperature setter 34 is lowered by 3 ° C. (step 7).

The outlet temperature t ₁ detected by the outlet temperature detector 4 and the set outlet temperature t ₀ set by the outlet temperature setting device 34.
When the relationship is t ₁ > t ₀ , the compressor controller 22 increases the capacity of the compressor 6, and when t ₁ <t ₀ , the compressor controller 2
2 reduces the capacity of the compressor 6 (step 8).

During heating, the set room temperature T₀And detected
Room temperature T₁And the difference is T₁-T₀Duct 1 if> 0
1 so that the air volume in₁-T₀<0 if no
The air volume control device 16 is enabled so that the air volume in the
The variable air volume unit 12 is controlled. And the first and second place
Constant rotation speed N_a, N_bAnd the rotation speed N of the indoor blower 20₁With
Relationship is N₁-N_aIf <0, set outlet temperature t₀This
3 ℃ lower than N₁-N_aIf> 0, set outlet temperature
t₀3 ° C. higher than before. And the outlet temperature t ₁And set
Constant blowing temperature t₀Is related to t₁> T₀In case of compressor
Controller 22 reduces the capacity of compressor 6 and t₁<T₀in the case of
Means that the compressor controller 22 increases the capacity of the compressor 6.

The air conditioner according to the second embodiment has
When the air conditioning load of 0 is reduced, the variable air volume unit 12
As a result, the amount of air passing through the duct 11 decreases, and the amount of air passing through the duct 11 decreases, so that the static pressure P ₁ in the duct 11 between the variable air volume unit 12 and the indoor unit main body 1 becomes higher than the set static pressure P _0. controller 21 tries to match the set static pressure P ₀ the static pressure P ₁ in the duct 11 between the lower the rotational speed N ₁ and a variable air volume unit 12 and the indoor unit main body 1 of the indoor blower 20.

[0049] When the rotational speed N ₁ of the indoor blower 20 is lower than the first predetermined rotational speed N _a which is set to be higher than the speed corresponding to the minimum supply air volume for ventilation, CPU 3
Numeral 3 is to increase the set temperature t ₀ of the air blown from the indoor unit main body 1 by a predetermined value during the cooling operation (decrease the predetermined value during the heating operation), and to set the temperature t ₁ of the air blown from the indoor unit main body 1 to the newly set temperature t. _It causes the compressor controller 22 to perform the capacity control (reduction in capacity) of the compressor 6 so as to become ₀ .

As a result, the temperature t ₁ of the air blown from the indoor unit body 1 rises by a predetermined value during the cooling operation (decreases by the predetermined value during the heating operation), the air-conditioning load of the room 10 to be conditioned increases, and the duct 11 Of the variable airflow unit 12 due to the increase of the airflow passing through the duct 11
Static pressure P ₁ in the duct 11 between the indoor unit main body 1 is set static pressure P ₀ from the consisting for lower blower controller 21 the rotational speed N ₁ of the indoor blower 20 first predetermined rotational speed N _a more and It is raised to.

In this embodiment, the variation of the set temperature t ₀ of the air blown from the indoor unit main body 1 is set to 3 ° C.
The temperature change width is such that the rotation speed N ₁ of the indoor-side blower 20 is changed to the first predetermined rotation speed N _a by the change in the set temperature t ₀ of the blown air.
When rising from a lower rotational speed, the rotational speed N ₁ becomes lower than the second predetermined rotational speed N _b, and the rotational speed N ₁ of the indoor blower 20 by a change in the set temperature t ₀ of the outlet air first If the drop from higher than the second predetermined rotational speed N _b rpm, the rotational speed N ₁ is if becomes higher as a temperature change width than the first predetermined rotational speed N _a, not a variation width of 3 ° C. Is also good.

In the second embodiment, by properly setting the variation range of the set outlet temperature, the assigned range of the set outlet temperature to the air-conditioning load is broadly overlapped, and the switching of the set outlet temperature can be reduced. So
The burden of controlling the capacity of the compressor can be reduced.

[0053]

As described above, in the air conditioner of the present invention, when the blower controller operates the indoor blower at a predetermined speed or less, the set temperature of the blown air temperature is increased by a predetermined value during cooling,
Since the control for lowering the predetermined value at the time of heating is performed, even when the air conditioning load of the room to be air-conditioned is low load, sufficient capacity control can be performed while securing the ventilation air volume. Overheating can be prevented, and a comfortable indoor environment can be maintained.

Another air conditioner according to the present invention is characterized in that the number of revolutions of the indoor blower becomes lower than the first predetermined number of revolutions set higher than the number of revolutions corresponding to the minimum supply air volume for ventilation. Increases the set temperature of the blow-off air temperature by a predetermined value during the cooling operation, decreases by a predetermined value during the heating operation, and furthermore, the rotation speed of the indoor side blower becomes higher than a second predetermined rotation speed which is set lower than the rotation speed corresponding to the maximum supply air volume. In such a case, control is performed to lower the set temperature of the blow-off air temperature by a predetermined value during cooling operation and to increase it by a predetermined value during heating operation. And the burden of controlling the capacity of the compressor can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a block diagram of the air conditioner of the embodiment.

FIG. 3 is a flowchart showing an operation of the air conditioner of the embodiment during a cooling operation.

FIG. 4 is a block diagram of a second embodiment of the air conditioner according to the present invention.

FIG. 5 is a flowchart showing an operation of the air conditioner of the embodiment during a cooling operation.

FIG. 6 is a schematic configuration diagram of a conventional air conditioner.

FIG. 7 is a flowchart showing an operation of the conventional air conditioner during a cooling operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Indoor unit main body 2 Indoor side heat exchanger 4 Outlet temperature detector 5 Outdoor unit main body 6 Compressor 7 Outdoor side heat exchanger 8 Outdoor side blower 10 Air-conditioned room 11 Duct 12 Variable air volume unit 16 Air volume control device 20 Indoor side air blower DESCRIPTION OF SYMBOLS 21 Blower controller 22 Compressor controller 23 Static pressure detector 24 Static pressure setting device 25 CPU 33 CPU

Claims (2)

(57) [Claims] 1. A duct-type indoor unit main body provided in a duct communicating with a room to be air-conditioned and having an indoor heat exchanger and a rotational-speed-controlled indoor blower therein, and a variable capacity compressor and a room therein An outdoor unit body having an outside heat exchanger and an outdoor blower, a variable air volume unit provided in a duct downstream of the indoor unit body to change an air volume passing through the duct, an operation mode of the air conditioner, and the air conditioning An air volume control device that controls the variable air volume unit so that the room temperature of the room to be air-conditioned matches the set room temperature in accordance with the room temperature and the set room temperature, and a duct between the variable air volume unit and the indoor unit main body. A static pressure detector that detects the static pressure of the static air pressure, a static pressure setter that sets the static pressure in the duct between the variable air volume unit and the indoor unit main body, and the static pressure detected by the static pressure detector is Static pressure set by static pressure setting device A blower controller that controls the number of revolutions of the indoor-side blower, a blowout temperature detector that detects a temperature of air blown from the indoor unit body, and a compressor control device that controls the operation of the compressor. A CPU for controlling the compressor controller, wherein the CPU controls the compressor controller so that the blown air temperature detected by the blowout temperature detector becomes a preset temperature. In addition to controlling the capacity of the fan, when the blower controller operates the indoor blower at a predetermined number of revolutions or less, the set temperature of the blown air temperature is increased by a predetermined value during a cooling operation, and a predetermined value during a heating operation. An air conditioner characterized by lowering prices. 2. A duct type indoor unit main body provided in a duct communicating with a room to be air-conditioned and having an indoor side heat exchanger and a rotation speed control type indoor side blower therein, and a variable capacity compressor and a room therein. An outdoor unit body having an outside heat exchanger and an outdoor blower, a variable air volume unit provided in a duct downstream of the indoor unit body to change an air volume passing through the duct, an operation mode of the air conditioner, and the air conditioning An air volume control device that controls the variable air volume unit so that the room temperature of the room to be air-conditioned matches the set room temperature in accordance with the room temperature and the set room temperature, and a duct between the variable air volume unit and the indoor unit main body. A static pressure detector that detects the static pressure of the static air pressure, a static pressure setter that sets the static pressure in the duct between the variable air volume unit and the indoor unit main body, and the static pressure detected by the static pressure detector is Static pressure set by static pressure setting device A blower controller that controls the number of revolutions of the indoor-side blower, a blowout temperature detector that detects a temperature of air blown from the indoor unit body, and a compressor control device that controls the operation of the compressor. A CPU for controlling the compressor controller, wherein the CPU controls the compressor controller so that the blown air temperature detected by the blowout temperature detector becomes a preset temperature. Control of the capacity of the air blower, and when the rotation speed of the indoor side blower becomes lower than a first predetermined rotation speed set higher than the rotation speed corresponding to the minimum supply air volume for ventilation, the blowout air temperature The preset temperature was increased by a predetermined value during the cooling operation, decreased by a predetermined value during the heating operation, and the rotation speed of the indoor blower became higher than a second predetermined rotation speed set lower than the rotation speed corresponding to the maximum supply airflow. Cooling operation when a predetermined Drops the set temperature of the outlet air temperature in the case, the air conditioner characterized by increasing a predetermined value during heating operation.