JPH05141749A - Air conditioner - Google Patents

Abstract

PURPOSE:To obtain an air conditioner which can maintain a comfortable environment in a room by assuring a ventilation air flow rate which does not excessively cool the room to be conditioned at the time of room cooling or not excessively warm at the time of room heating when an air conditioning load of the room to be conditioned is decreased. CONSTITUTION:A CPU 21 so controls a compressor 6 through a compressor controller 20 that a diffusing temperature to be detected by a diffusing temperature detector 4 becomes a set diffusing temperature previously set to a diffusing temperature setter 23. If a predetermined number X of stops of the compressor 6 occurs within a predetermined period of time, the set diffusing temperature of the setter 23 is controlled to be raised by a predetermined value at the time of room cooling or lowered by a predetermined value at the time of room heating.

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 the ability to keep a blowout temperature constant.

[0002]

2. Description of the Related Art As a conventional air conditioner for performing constant blowout temperature control, there is an air conditioner disclosed in JP-A-2-122138.

Hereinafter, an air conditioner for performing the above-described constant blowout temperature control will be described with reference to the drawings. Figure 4
Is a schematic configuration diagram showing a conventional air conditioner. Reference numeral 1 is a duct type indoor unit main body, which detects the temperature of air blown out by the indoor heat exchanger 2, the indoor blower 3, and the indoor blower 3. It has a blowout temperature detector 4. Reference numeral 5 is an outdoor unit body, which has a variable capacity compressor 6, an outdoor heat exchanger 7,
It has a compressor controller 9 for controlling the capabilities of the outdoor blower 8 and the compressor 6.

A duct 11 connects the indoor unit body 1 to the air-conditioned room 10 and guides warm air or cold air to the air-conditioned room 10. A variable air volume unit 12 is provided in the middle of the duct 11, and the room temperature of the air-conditioned room 10 is controlled by changing the passing air volume. 13 is a return duct, which is the air-conditioned room 1
Air is introduced from 0 to the indoor unit body 1. 14 is an intake duct,
Reference numeral 15 denotes an exhaust duct, which includes an air supply duct 14 and an exhaust duct 15.
In each case, a fan as a supply / exhaust device was installed in the middle of the duct.
4a, 15a, which discharges a part of the air in the return duct 13 and supplies the outside air to the air-conditioned room 10
Is ventilating.

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 T0 set by a room temperature setter 18 provided in a room temperature regulator 17 in the air-conditioned room 10. The damper (not shown) and the motor (not shown) in the variable air volume unit 12 are controlled by the difference from the room temperature T1 to control the passing air volume in the duct 11.

The operation of the air conditioner having the above-described constant blowout temperature control during cooling will be described below with reference to FIG.

The difference (step a) between the set room temperature T0 set by the room temperature setting unit 18 in the room temperature adjuster 17 and the room temperature T1 detected by the room temperature detector 19 is T1-T0> 0 during cooling / heating.
In this case, the air volume control device 16 controls the variable unit 12 so that the air volume in the duct 11 increases (step b). On the contrary, when T1−T0 <0, the air volume in the duct 11 is controlled to be reduced (step c).

At this time, in order to secure the ventilation air volume of the air-conditioned room 10, the variable air volume unit 12 does not cause the passing air volume in the duct 11 to become less than a preset air volume at a minimum. In this way, the passing air volume in 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 body 1 is always constant (step d).

As described above, air is blown from the indoor unit body 1 at a constant blowout temperature, and the variable air volume unit 12 changes the amount of air supplied into the air-conditioned room 10 to air-condition the air-conditioned room 10. Is.

[0010]

However, in the above-mentioned conventional configuration, even if the air conditioning load of the air-conditioned room is reduced, it is not possible to reduce the supply air volume below a certain level in order to secure the ventilation air volume, so that the air conditioning is not possible. At the time, the air-conditioned room is too cold, and when it is heated, it is too warm, that is, the capacity of the air conditioner does not decrease.

According to the present invention, when the air-conditioning load of the air-conditioned room is reduced, the air-conditioned room is not over-cooled during cooling or over-heated during heating, and the ventilation air volume is secured to maintain a comfortable indoor environment. To aim.

[0012]

To achieve the above object, in an air conditioner of the present invention, an air temperature detector for detecting the temperature of air blown from an indoor unit body, and a compressor for controlling the operation of the compressor. A control device and a CPU for controlling the compressor controller are provided.

The CPU causes the compressor controller to control the capacity of the compressor so that the temperature of the blown air detected by the blowout temperature detector reaches a preset temperature. Is operating at minimum capacity, and
When the blown air temperature is lower than the set temperature by a certain temperature during cooling or a certain temperature during heating, the operation of the compressor is controlled to be stopped, and the operation of the compressor is stopped a predetermined number of times within a predetermined time. In this case, control is performed such that the set temperature of the blown air temperature is increased by a predetermined value during cooling operation and is decreased by a predetermined value during heating operation.

[0014]

In the air conditioner of the present invention, when the air conditioning load in the air-conditioned room is reduced, the variable air flow unit reduces the amount of air passing through the duct, and the temperature of the air blown out of the air conditioner decreases during cooling and rises during heating. To change. At this time, the CPU controls the capacity of the compressor so as to keep the temperature of the blown air constant. Further, when the compressor operates at the minimum capacity and the blown-air temperature is lower than the set temperature by a constant temperature during cooling or a constant temperature during heating, the operation of the compressor is controlled to be stopped.

When the operation of the compressor is stopped a predetermined number of times within a predetermined time, the CPU raises the set temperature of the air blown from the indoor unit main body by a predetermined value during the cooling operation (decreases a predetermined value during the heating operation), and The compressor controller is made to control the capacity of the compressor (decrease the capacity) so that the temperature of the air blown out from the indoor unit body becomes the newly set temperature.

As a result, the temperature of the air blown from the indoor unit main body increases by a predetermined value during cooling operation (decreases by a predetermined value during heating operation), and even if the air conditioning load in the air-conditioned room is the same, the variable air volume unit increases the air flow through the duct. Further, since the variable air volume unit can reduce the air volume to the minimum air volume (ventilation air volume), the capacity of the compressor can be further reduced.

[0017]

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

In FIG. 1, a duct type indoor unit body 1
Is equipped with an indoor heat exchanger 2, an indoor blower 3, and an outlet temperature detector 4 inside. The outdoor unit main body 5 includes therein a variable capacity compressor 6, an outdoor heat exchanger 7, an outdoor blower 8, and a compressor controller 20.

In FIG. 2, reference numeral 21 denotes a CPU for controlling the air conditioner of this embodiment, which compares the set room temperature T0 set by the room temperature setting device 18 with the room temperature T1 detected by the room temperature detector 19. Comparing the room temperature comparator 22, the outlet temperature setting device 23 that sets the outlet temperature, the outlet temperature t1 detected by the outlet temperature detector 4 and the set outlet temperature t0 set by the outlet temperature setting device 23. Blowout temperature comparator 24
The operation mode detector 25 and the counter 26 that counts the number of times the compressor 6 has been stopped X are incorporated.

The CPU 21 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 22 and the operation mode detected by the operation mode detector 25. Further, the capacity of the compressor 6 is changed via the compressor controller 20 according to the comparison result of the blowout temperature comparator 24 and the operation mode detected by the operation mode detector 25, and the blowout temperature is set by the number of times the counter 26 stops the compressor. The set temperature of the container 23 is changed.

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 T0 set by the room temperature setter 18 in the room temperature adjuster 17 and the room temperature T1 detected by the room temperature detector 19 is the air conditioner T1-T0> 0, the air flow controller 16 Controls the variable air volume unit 12 so that the air volume in the duct 11 increases (step 1). Conversely, T1
When -T0 <0, control is performed so as to reduce the air volume in the duct 11 (step 1).

At this time, in order to secure the ventilation air volume of the air-conditioned room 10, the variable air volume unit 12 does not cause the passing air volume in the duct 11 to fall below a preset air volume. In this way, the passing air volume in the duct 11 changes,
The compressor controller 20 varies the capacity of the compressor 6 so that the blowout temperature t1 detected by the blowout temperature detector 4 in the indoor unit body 1 always becomes the set temperature t0 of the blowout temperature setter 23.
(Step 2).

Further, in the compressor controller 20, the compressor 6 operates at the minimum capacity, and the blowout temperature t1 is the set temperature t0.
As a result, does the constant temperature A drop during cooling (t1-t0≤-
A) When the constant temperature B rises during heating (t1-t0 ≧ B), the operation of the compressor 6 is controlled (step 3), and the number of stop times X of the compressor 6 counted by the counter 26 is counted. However, if it occurs a predetermined number of times within a predetermined time, the set temperature t0 of the outlet temperature setting device 23 is increased by a predetermined value during cooling and decreased by a predetermined value during heating (step 4).

The CPU 21 raises the set temperature t0 of the air blown from the indoor unit main body 1 by a predetermined value during the cooling operation (decreases the predetermined value during the heating operation), and the temperature t1 of the air blown out from the indoor unit main body 1 is a newly set temperature. The compressor controller 20 is caused to perform capacity control (capacity reduction) of the compressor 6 so as to reach t0.

More specifically, when the compressor controller stops the operation of the compressor a predetermined number of times X within a predetermined time, the constant blowout temperature t0 is changed to 18 ° C. At this time, the maximum supply air volume to the air-conditioned room 10 is 50 m ³ / min,
Assuming that the minimum supply air volume (required air volume for ventilation) is 20 m ³ / min, if the constant outlet temperature t0 remains at 15 ° C, the capacity can be reduced only to about 40%, which is the subject of the above-mentioned air conditioning. When the cooling load of the room 10 becomes 40% or less, overcooling of the room occurs.

When the compressor controller stops the operation of the compressor a predetermined number of times within a predetermined time as in this embodiment, if the constant blow-out temperature t0 is changed to 18 ° C., the suction temperature of the indoor unit 1 is changed. If the temperature is 26 ° C., 20 (26-1)
8) / 50 (26-15) = 0.29 to about 29% can be controlled while ensuring a minimum air flow rate of 20 m ³ / min.

Also 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, when the compressor controller stops the operation of the compressor a predetermined number of times within a predetermined time, the set temperature t0 of the blowout temperature is increased by a predetermined value during cooling, and is decreased by a predetermined value during heating. As a result, the capacity control range can be expanded while ensuring the minimum ventilation air volume.
It is possible to prevent the room from becoming too cold or too warm when the air conditioning load of 0 decreases.

[0030]

As described above, in the air conditioner of the present invention, when the compressor controller stops the operation of the compressor a predetermined number of times within a predetermined time, the set temperature of the blown air temperature is set to a predetermined value during cooling. Since the price increase and the predetermined value decrease during heating are performed,
Even when the air-conditioning load of the air-conditioned room is low, it is possible to perform sufficient capacity control while securing the ventilation air volume, and it is possible to prevent over-cooling during air-conditioning in the air-conditioned room and over-warming during heating. This has the effect of maintaining a comfortable indoor environment.

[Brief description of drawings]

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

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

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

FIG. 4 is a schematic configuration diagram of a conventional air conditioner.

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

[Explanation of symbols]

 1 Indoor Unit Main Body 2 Indoor Side Heat Exchanger 3 Indoor Side Blower 4 Outlet Temperature Detector 5 Outdoor Unit Main Body 6 Compressor 7 Outdoor Heat Exchanger 8 Outdoor Side Blower 10 Air-conditioned Room 11 Duct 12 Variable Air Volume Unit 16 Air Volume Control Device 20 Compressor controller 21 CPU

Claims (1)

[Claims] 1. A duct type indoor unit main body having an indoor side heat exchanger and an indoor side blower provided in a duct communicating with an air-conditioned room, a variable capacity compressor, an outdoor side heat exchanger, An outdoor unit main body having an outdoor blower, a variable air volume unit provided in a duct downstream of the indoor unit main body for changing the amount of air passing through the duct, an operation mode of an air conditioner, and a room temperature of the air-conditioned room. An air volume control device that controls the variable air volume unit so that the room temperature of the air-conditioned room matches the set room temperature in accordance with the room temperature, a blowout temperature detector that detects a blown air temperature from the indoor unit body, and the compression A compressor control device for controlling the operation of the compressor, and a CPU for controlling the compressor controller are provided, and the CPU is configured such that the blown air temperature detected by the blown temperature detector is set to a preset temperature. The compressor controller controls the capacity of the compressor so that the compressor operates at the minimum capacity and the blown air temperature is lower than the set temperature by a constant temperature during cooling or a constant temperature during heating. If it goes up, while controlling to stop the operation of the compressor, if the operation stop of the compressor occurs a predetermined number of times within a predetermined time, the set temperature of the blown air temperature is increased by a predetermined value during the cooling operation,
An air conditioner characterized by lowering a predetermined value during heating operation.