JP2776588B2 - Air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner that performs capacity control for keeping blow-off temperature constant.

2. Description of the Related Art An embodiment of a conventional air conditioner that performs constant blow-off temperature control will be described with reference to the drawings.

FIG. 3 is a schematic diagram showing the configuration of a conventional air conditioner, in which 1 is an indoor unit main body, in which an indoor heat exchanger 2, an indoor blower 3,
It has an outlet temperature detector 4 for detecting the temperature of the air blown out by the indoor side blower 3. 5 is the outdoor unit body,
A compressor 6, an outdoor heat exchanger 7, an outdoor blower 8, and a compressor controller 9 for controlling the capacity of the compressor 6 therein.
have.

A duct 11 is connected from the indoor unit main body 1 to the room to be conditioned 10 through a duct 11, and guides warm air or cold air to the room to be 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 amount of air passing therethrough. A return duct 13 guides air from the air-conditioned room 10 to the indoor unit main body 1. 14 is an air supply duct, 15 is an exhaust duct, and both the air supply duct 14 and the exhaust duct 15 have fans 14 ', 15' as air supply / exhaust devices in the middle of the duct. In addition to exhausting the air, the outside air is supplied to ventilate the air-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 10. room temperature T with ₁ by the difference between (not shown) damper 12a in the variable air volume unit 12 controls the motor 12b (not shown),
The amount of air passing through the duct 11 is controlled.

 Next, the operation will be described.

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
When T ₁ −T ₀ > 0 during cooling, the air volume control device 16 controls the variable air volume unit so that the air volume in the duct 11 increases. Conversely, when T ₁ −T ₀ <0, control is performed to reduce the air volume in the duct 11. At this time, in order to secure the ventilation air volume of the air-conditioned room 10,
In the variable air volume unit, the air volume passing through the duct 11 at least does not fall below a preset air volume. As described above, although the amount of air passing through the duct 11 changes, the indoor unit 1
The compressor control device 9 varies the capacity of the compressor 6 so that the blow-out temperature detected by the blow-out temperature detector in the inside becomes a preset set temperature t ₀ .

If the time compression force becomes the first predetermined capacity Q ₁ or less, the blowing setting temperature t ₀ of the air temperature in the cooling time of the predetermined markup t ₁ (t _1> t _0), the heating time of a predetermined price cuts t ₁ (T ₁ <t ₀ ) is changed. This change of the outlet set temperature t ₀ causes the air-conditioned room 10
Supply air volume is minimum (ventilation air volume) when the air conditioning load of
Even if the supply air volume cannot be reduced, the cooling air supply air temperature is raised by a predetermined value, and the heating air supply air temperature is lowered by a predetermined value, thereby reducing the capacity of the air conditioner and reducing the air conditioning load. Can respond.

In addition, the air-conditioning load of the room to be air-conditioned 10 increases, and the compression function capacity is Q ₂ ≧
When increased to Q ₁ becomes the second predetermined capacity, the balloon returned the set temperature of the air temperature t _0, corresponding to a high air conditioning load.

Invention in the configuration has problems, however above to be solved, the set temperature of the normal air conditioning load from the set temperature t ₁ of the supply air during low air conditioning load
To return to t _0, since when the air conditioning load is increasing supply air volume to be air-conditioned chamber also increased, anyway, balloon when returning the air temperature t _0, the state in which the air conditioning function force is increased from the air conditioning load Continues until the supply air volume decreases and reaches an appropriate air volume. That have the problem of room temperature of the air conditioned room is excessive cooling during the cooling, conditions impairing the comfort of the indoor environment, such as too Yurumari during heating occurs when return to t ₀ comprising the set temperature of the air temperature from t ₁ blowout Was.

In view of the above problems, blowing when returning the set temperature of the air temperature from t ₁ to t _0, the air conditioner to maintain a comfortable indoor environment to prevent temporary excessive cooling and warm only in the air-conditioned room To provide.

Means for Solving the Problems Therefore, the air conditioner of the present invention is provided with a timer in addition to the conventional one, and the compressor control device detects the blown air temperature detected by the blowout temperature detector at a preset temperature. Control the capacity of the variable capacity compressor so that it becomes t ₀ ,
If compression force of the capacity variable type is lowered to the first predetermined capacity Q ₁ or less, the cooling operation when a predetermined raise the set temperature of the air temperature blowing, in addition to the conventional that the heating operation when Ru predetermined Drops, Compression force after lowering the first predetermined capacity Q ₁ or less, if the compression force is increased to Q ₁ ≦ Q ₂ becomes a second predetermined capacity Q _2,
Activate the timer and set the compression function to Q ₂ for a predetermined time.
<Perform operation in a third predetermined capacity Q ₃ comprising Q _3, is obtained to perform the capacity control operation for a constant outlet air temperature after a predetermined time has elapsed.

In construction of the above effects, if the return from the set temperature t ₁ of the supply air at low air conditioning load in the normal set temperature t ₀ of time air conditioning load,
It will gradually return, and the air conditioning function will not increase too much with respect to the air conditioning load.Therefore, there will be no excessive cooling during cooling or excessive heating during heating, impairing the comfort of the indoor environment. There is no.

Embodiment An embodiment of the present invention will be described with reference to the drawings. The same factors as in the conventional example are assigned the same numbers, and detailed explanations are omitted.

FIG. 1 is a schematic diagram of the configuration of the present embodiment. Reference numeral 1 denotes an indoor unit main body, which includes an indoor heat exchanger 2, an indoor blower 3, and a blowout temperature detector 4. Reference numeral 5 denotes an outdoor unit main body, which includes therein a compressor 6, an outdoor heat exchanger 7, an outdoor blower 8, and a compression control device 9 of variable capacity. The air-conditioned room 10 having the timer 9a in the compressor control device 9 and the indoor unit main body 1
Are connected by a duct 11, and a variable air volume unit 12 is provided in the middle of the duct 11. Reference numeral 13 denotes a return duct to which an intake duct 14 and an exhaust duct 15 are connected. 14 ', 15' is the intake duct 1 as a supply / exhaust device
4, a fan for the exhaust duct 15. Reference numeral 16 denotes an air volume control unit for the variable air volume unit 12, and 17 denotes a room temperature controller provided in the room to be air-conditioned 10, and has an air temperature setting unit 18 and a room temperature detector 19 therein.

Next, the operation will be described with reference to the block diagram of FIG. 20 is a CPU (not shown) for controlling the air conditioner,
Room temperature comparator 21 for comparing the room temperature T ₁ detected the set room temperature T ₀ that has been set by the compartment temperature setting device 18 therein at the room temperature detector 19, outlet temperature setter 22 for setting the blow-out temperature
When a blowing temperature comparator 23 for comparing the air temperature detector 4 blowout is detected by the temperature t ₁ and set blow-out temperature t ₀ which is set at outlet temperature setter 22, a predetermined capacity of the compressor 6 And a predetermined capacity Q ₀ stored in the storage unit 24.
And a capacity comparator 25 for comparing the capacity with the capacity Q ₀ of the compressor 6. The CPU20, the causes to change the air volume of the variable air volume unit 12 by comparing the results of the room temperature comparator 21, changing the capacity Q ₀ of the compressor 6 by comparison of the air temperature comparator 23. Further, the set temperature of the blowout temperature setter 22 is changed according to the comparison result of the capacity comparator 25.

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

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
Air volume control device 16 such that the air volume when duct 11 of the cooling time T ₁ -T _0> 0 is increased to control a variable air volume unit (Step 1). Conversely, when T ₁ −T ₀ <0, control is performed to reduce the air volume in the duct 11 (step 1). At this time, in order to secure ventilation air volume, the variable air volume
The passing air volume in 11 does not fall below the preset air volume. Thus, the amount of air passing through the duct 11 changes,
The compressor control device 9 controls the capacity of the compressor 6 so that the blow-out temperature detected by the blow-out / temperature detector 4 in the indoor unit body 1 becomes a preset temperature t ₀ (step). 2).

If the time compression force becomes the first predetermined capacity Q ₁ or less, the blowing setting temperature t ₀ of the air temperature in the cooling time of the predetermined markup t ₁ (t _1> t _0), the heating time of a predetermined price cuts t ₁ (T ₁ <t ₀ ) (step 3). After that, the compression function force becomes Q ₁ ≤ Q ₂
If increased to a second predetermined capacity Q ₂ to which made, the timer 9a is operated, the compressor 6 for a predetermined time, Q ₂ <Q ₃ becomes a third predetermined capacity Q _3, it is detected by the outlet temperature detector 4 Continue operation regardless of temperature. After a lapse of a predetermined time by the timer 9a, the compressor 6 restarts the capacity control so as to keep the blown air temperature constant (step 4).

More specifically, the constant blowout set temperature t ₀ during the cooling operation is set.
Is set to 15 ° C., when the compression function force becomes 50% (Q ₁ ) or less, the constant blow set temperature is changed to 18 ° C. (t ₁ ). At this time, the maximum supply air volume to the air-conditioned room 10 is 50 m ³ / mi
n, Assuming that the minimum supply air volume (air volume required for ventilation) is 20 m ³ / min, the capacity is about 40% if the constant blowing temperature remains at 15 ° C.
If the cooling load of the room to be air-conditioned 10 becomes 40% or less, the room may be overcooled. However, as in this embodiment, the capacity of the compressor is 50% (Q ₁ ) If the constant air temperature is changed to 18 ° C when the temperature falls below, if the indoor unit suction air temperature is assumed to be 26 ° C, 20 (26-18)
From / 50 (26-15) = 0.29 to about 29%, minimum air volume 20m ³ /
Compressor capacity control can be performed while securing min. Further, in the case of heating, similarly to the case of cooling, the heating capacity control range can be expanded while securing the minimum air volume.

Next, the air-conditioning load of the room to be air-conditioned 10 increases, and the compression
% (Q ₂ ), the timer 9a is operated, and the operation is performed with the compression function force fixed at 70% (Q ₃ ) for a predetermined time. After a lapse of a predetermined time by the timer 9a, the compressor 6 restarts the variable capacity operation. If the blow-out air temperature is 18 ° C and the compression function is 60%, as mentioned above,
In the case of ° C, x (26-18) / 50 (26-15) = 0.6 {x}
From 41, the air volume is 41 m ³ / min. When the temperature of the blown air is returned to 15 ° C as in the conventional example, 41 × (26-
15) / 50 × (26−15) ≒ 0.8, the compression function becomes approximately 80%, and the air-conditioned room 10 is in an excessively cool state until the supply air volume reaches the appropriate air volume. Here, when the compression function force is fixed at 70% as in the present embodiment, 41 × (26−y) / 50 (26−15)
= 0.7 y = 16.6, the outlet air temperature is 16.6 ℃,
The state of being too cold is reduced as compared with the conventional example. In this state, while the operation is being performed for a predetermined time, the supply air volume becomes an appropriate value and the capacity control operation of the compressor 6 is restarted so that the blown air temperature becomes constant (15 ° C.). Does not occur.

As described above, according to the present embodiment, when the outlet air temperature is changed and then restored, the outlet air temperature is returned by operating the compressor for a predetermined time without performing the capacity control of the compressor. In this case, there is an effect of reducing excessive cooling and excessive warming of the room to be air-conditioned.

According to the present invention as described above the effect of the invention, performs a constant blow-out temperature control, if the extrusion function force becomes the first predetermined capacity Q ₁ or less, cooling time predetermined raise the air temperature blowing, heating at a predetermined Drops in an air conditioner for controlling that, Q ₁ ≦ Q ₂ becomes if compression force to a second predetermined capacity Q ₂ is increased, the third predetermined that only compression forces predetermined by operating the timer time is Q ₂ <Q ₃ operating at capacity Q _3, after a predetermined time, blowing by resuming the capacity control operation for the air temperature constant, excessive cooling or the air-conditioning chamber when returning the blow air temperature, the effect of reducing only warms With.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of the configuration of an air conditioner according to one embodiment of the present invention,
FIG. 2 is a block diagram of the same, FIG. 3 is an operation flowchart of the present embodiment, FIG. 4 is a conceptual diagram of a configuration of a conventional air conditioner,
FIG. 5 is a conventional operation flowchart. 2 ... indoor heat exchanger, 3 ... indoor blower, 1 ... indoor unit body, 6 ... compressor, 7 ... outdoor heat exchanger, 8 ...
... Outdoor blower, 5 ... Outdoor unit body, 4 ... Outlet temperature detector, 9 ... Compressor control device, 9a ... Timer.

Claims (1)

(57) [Claims] An indoor unit having an indoor heat exchanger and an indoor blower therein, an outdoor unit having a variable capacity compressor, an indoor heat exchanger and an indoor blower therein; An outlet temperature detector for detecting an outlet air temperature of the indoor unit main body, a compressor control device for controlling operation of the compressor, and a timer, and the compressor control device includes an outlet temperature detector. The detected outlet air temperature is set to a preset set temperature t _0.
In addition to controlling the capacity of the variable capacity compressor so that the variable capacity type compressor has a first predetermined capacity Q ₁
If drops below the set temperature cooling operation when a predetermined markup of the blowing air temperature, the heating operation at a predetermined price reduction, if subsequent compression force is increased to Q ₁ ≦ Q ₂ becomes a second predetermined capacity Q _2, wherein Activate the timer and set the compressor to Q ₂ for a predetermined time.
<Continue to operate at a third predetermined capacity Q ₃ comprising Q _3, after the timer operation is completed, the air conditioner characterized by performing capacity control operation for the outlet air temperature constant.