JP3206245B2 - 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. Specifically, the present invention relates to a technique for stably controlling the indoor temperature in an air conditioner for cooling or heating.

[0002]

2. Description of the Related Art In a constant-speed type air conditioner in which a compressor is operated at a constant speed, the compressor is operated when the room temperature reaches an operation-on temperature, and the compressor is stopped when the room temperature reaches the operation-off temperature. The temperature is kept within a certain temperature range around the set temperature.

Conventionally, each of the operation-on temperature and the operation-off temperature is set to one value for each set temperature. For example, with respect to the set temperature Ts, the operation ON temperature T _ON and the operation OFF temperature T _OFF are determined such that T _ON = Ts T _OFF = Ts + β. Here, β is the operation-off temperature constant, and β> 0 for heating and β <0 for cooling. Then, the room temperature Tr is detected by the room temperature sensor provided at the suction port of the indoor unit, and when the detected room temperature Tr becomes the operation ON temperature T _ON , the compressor is operated to start the operation of the outdoor unit, and the operation is turned off. When the temperature T _OFF is reached, the compressor is stopped, the operation of the outdoor unit is stopped, and the room temperature is adjusted near the set temperature.

FIGS. 5 (a) and 5 (b) are diagrams showing a state of room temperature control during a heating operation in a conventional air conditioner, and FIG. 5 (a) shows a large difference between a set temperature Ts and an outside air temperature. FIG. 5 shows a state of room temperature control in a case where the heating load is large, for example, when the wall, floor, ceiling, etc. of the room are difficult to warm.
(B) shows how the room temperature is controlled when the heating load is small, such as when the difference between the set temperature Ts and the outside air temperature is small, or when the wall, floor, ceiling, etc. of the room is likely to warm.

First, the state of room temperature control when the heating load is large will be described with reference to FIG. The solid line A in FIG. 5A indicates a change in room temperature Tr (detection temperature) near the suction port of the indoor unit, and the broken line B indicates a change in room temperature Tf (sensible temperature) near the floor. When the air conditioner is turned on as shown by the solid line A, the room temperature Tr increases, and the room temperature Tr becomes the operation OFF temperature T _{OF F}
, The compressor stops, and the room temperature Tr gradually decreases. When the room temperature Tr decreases and the operation-on temperature T _ON is reached, the compressor starts operating again. However, when the compressor is restarted immediately after stopping, excessive pressure is applied to the compressor. Until td (about 3 minutes) elapses, the compressor is not operated even if the operation ON temperature T _ON is reached, thereby protecting the compressor. Therefore, at the beginning of turning on the air conditioner, the room temperature Tr is equal to the operation ON temperature T.
_The compressor does not operate even when turned on, and starts operating when the delay time td has elapsed. Immediately after the air conditioner is turned on, since the walls, floor, ceiling, etc. of the room are cold, the room temperature Tr during the delay time td after the compressor stops.
When the wall, floor, ceiling, etc. of the room warms up, the decrease in room temperature during the delay time td is alleviated, and finally the room temperature Tr reaches the operation-on temperature T _ON after the delay time td. become. Thereafter, the compressor is operated and stopped between the operation ON temperature T _ON and the operation OFF temperature T _OFF, and the room temperature Tr is maintained between the operation OFF temperature T _OFF and the operation ON temperature T _ON .

The room temperature Tf near the floor also changes as indicated by the broken line B. However, since cold air tends to accumulate near the floor, the room temperature Tf near the floor is lower than the room temperature Tr near the suction port. lower than, but gradually becomes substantially equal to the the difference no longer sensible temperature with the detected temperature, even room temperature Tf in the vicinity of the floor surface is maintained between the driver off temperature T _oFF and operating on the temperature T _oN.

[0007]

In the above conventional air conditioner, immediately after the air conditioner is turned on, the walls, floors, ceilings, etc. of the room are in a cold state. Even if the room temperature Tr reaches the set temperature Ts, the walls, floors, ceilings, etc. of the room are still cold, and when the compressor stops, the room temperature Tr drops sharply due to radiation from the surroundings (the region of FIG. 5A). C). If the room temperature Tr decreases, the compressor may be operated immediately. However, once the compressor is stopped, a delay function works to protect the compressor, and a certain delay time td
Since the operation of the compressor cannot be restarted until the time has elapsed, there is a disadvantage that the room temperature Tr drops while the compressor is stopped, and it feels quite chilly. In addition, when the indoor heating load is extremely large, there is a problem that the room temperature Tr during the stoppage of the compressor is considerably lower than the set temperature Ts as shown in FIG. .

In order to solve such a disadvantage, it is conceivable to set the operation off temperature T _OFF to a value considerably higher than the set temperature Ts. That is, as shown by the solid line a in FIG. 5 (b), the operation-off temperature T _OFF is set high so that the compressor can be started immediately when the room temperature Tr decreases and reaches the operation-on temperature T _ON. During a certain delay time td after the compressor is stopped, the room temperature can be controlled so that the room temperature Tr near the suction port does not fall below the set temperature Ts. However, since the operation off temperature T _OFF is set to one value with respect to the set temperature Ts regardless of the magnitude of the heating load such as a temperature difference between the outside air temperature and the set temperature Ts, it is assumed that the heating load is large. And operation off temperature T
_{If OFF} is set high, when the heating load is small, such as when the outside air temperature is high and the difference from the set temperature Ts is small,
As shown by the broken line b in FIG. 5B, the room temperature Tf near the floor surface becomes too high than the set temperature Ts, which causes a problem that the user feels hot.

Further, since one operation-off temperature T _OFF is determined for the set temperature Ts, the outside air temperature changes with the elapse of the operation time, or the ambient temperature changes depending on the degree of warming of the wall, floor, ceiling, etc. of the room. This causes a problem that the greater the change in the heating load, the lower the stability of the temperature of the entire room at the set temperature Ts.

Similarly, when the cooling operation is being performed, the operation is exactly opposite to the heating operation, and the room temperature Tr rises while the compressor is stopped, and there is a drawback that it feels hot. In order to solve such a disadvantage, the operation-off temperature T _OFF
If the temperature is set low, the room temperature Tf near the floor surface becomes too lower than the set temperature Ts, and the user feels cold.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has as its object to provide comfortable heating in accordance with the state of a cooling / heating load such as a temperature difference between an outside air temperature and a set temperature. To provide an air conditioner capable of performing air conditioning and cooling.

[0012]

According to the first aspect of the present invention,
Air conditioners detect room temperature and operate
Start operation of the compressor, and the detected temperature is the operation off temperature.
If the air conditioner is controlled to stop the compressor
At the start of operation, the temperature difference between the set temperature and room temperature
One of a plurality of operation off temperatures
After starting the operation, set the
From the operation ON temperature to the operation OFF temperature
One of two or more run-off temperatures depending on the required time
The feature is that one operation off temperature is set.
are doing. An air conditioner according to claim 2 of the present invention.
In the invention according to the first aspect, after starting the operation,
From operation-on temperature to operation-off temperature during compressor operation
The operation set according to the time required to reach
Set the off temperature to one of three or more operation off temperatures.
It is made to be.

[0013]

The air conditioner according to claim 1 of the present invention .
At the start of operation according to the temperature difference between the set temperature and room temperature.
Any one of multiple operation off temperatures
After starting the operation, the
Time required to reach operation off temperature from operation on temperature
One of two or more run-off temperatures depending on
Because the operation off temperature is set,
Stop operation using one of the operation off temperatures according to the load
Can be done. Therefore, when the heating load is large during the heating operation, the operation of the compressor is stopped by using the high operation off temperature, so that the set temperature does not drop much below the room temperature even if it suddenly drops. In addition, when the heating load is small, the operation is stopped using the low operation-off temperature, so that the room temperature does not become too high than the set temperature. In addition, when the cooling load is large during the cooling operation, the operation is stopped using the low operation off temperature, so that the room temperature does not rise and does not greatly exceed the set temperature during the operation stop. In addition, when the cooling load is small, the operation is stopped using the high operation off temperature, so that the room temperature can be prevented from being lower than the set temperature.

An air conditioner according to claim 2 of the present invention.
For the compressor, after starting operation,
From the operation on temperature to the operation off temperature
Any one of three or more operation off temperatures depending on time
Because the two operating off temperatures are set, the operating off temperature is set according to the change in the outside air temperature (seasonal change, daytime change) and the heating load of the room, such as the room walls and the floor, etc. And gradually change between the set temperature and the operation-off temperature.
The room temperature is finally set by reducing the temperature difference.
The temperature can be converged to around the constant temperature, the stability of the room temperature around the set temperature can be improved, and the room temperature can be quickly maintained at the set temperature.

Therefore, according to the present invention, the room temperature can be maintained at a comfortable temperature regardless of the magnitude of the cooling / heating load, and the room temperature can be quickly brought close to the set temperature.
Further, the room temperature can be stably maintained at a constant temperature near the set temperature.

[0016]

1 shows an air conditioner A according to an embodiment of the present invention.
FIG. The air conditioner A includes an indoor unit 1 and an outdoor unit 2. Inside the outdoor unit 2, the four-way valve 3, the outdoor heat exchanger 4, the capillary tube 5
The heat medium circulation circuit 8 is configured by connecting a check valve 6 and a capillary tube 7 connected in parallel. A sub-circuit 11 including an accumulator 9 and a compressor 10 is connected to another inlet and outlet of the four-way valve 3. Reference numeral 12 denotes a blower fan. The indoor unit 1 has a suction port 1
A room temperature sensor 13 and an indoor heat exchanger 14 are provided so as to be opposed to 6, and the indoor heat exchanger 14 is connected to the heat medium circulation circuit 8 of the outdoor unit 2. Reference numeral 15 denotes a blower fan for forcibly blowing out the air sucked from the suction port 16 and heat-exchanged with the indoor heat exchanger 14 from the air outlet 17.
Is a drain pan for receiving and discharging water drops falling from the indoor heat exchanger 14.

During the cooling operation, the flow direction of the four-way valve 3 is switched to the direction shown by the broken line in FIG. 1, and the indoor cooling is performed by the same operation as a general cooling device. That is, during the cooling operation, the heat medium (refrigerant) circulates in the direction indicated by the dashed arrow in FIG.
The heat medium in the section on the outdoor heat exchanger 4 side is condensed by the compressor 10 and the heat of condensation of the heat medium is
As a result, the air is discharged from the outdoor heat exchanger 4 to the outside. The condensed heat medium passes through the capillary tube 5 and the check valve 6 and is circulated to the indoor heat exchanger 14 so that the indoor heat exchanger 1
When the thermodynamic cycle of vaporizing on the 4 side is repeated, the heat medium that has passed through the capillary tube 5 expands and vaporizes on the indoor heat exchanger 14 side, and when the heat medium vaporizes, takes away the surrounding heat as heat of vaporization. . Therefore, the air sucked into the indoor unit 1 from the inlet 16 of the indoor unit 1 exchanges heat with the indoor heat exchanger 14 and is cooled, and cool air is blown into the room from the outlet 17 of the indoor unit 1 by the blower fan 15. The room is cooled down.

In the heating operation, the flow direction of the four-way valve 3 is switched to the direction shown by the solid line in FIG. 1, and the functions of the indoor heat exchanger 14 and the outdoor heat exchanger 4 are reversed from those in the cooling operation. That is, during the heating operation, the heat medium circulates in the direction of the solid line arrow in FIG. 1, the heat medium in the section between the compressor 10 and the capillary tube 7 on the indoor heat exchanger 14 side is condensed by the compressor 10, and the heat of condensation is condensed. appear. Suction port 1 of indoor unit 1
The air sucked from 6 is heated by exchanging heat with the heat medium by the indoor heat exchanger 14, and hot air is blown out from the outlet 17 by the blower fan 15 to heat the room.
On the other hand, the condensed heat medium flows into two capillary tubes 7,
5 and circulates to the outdoor heat exchanger 4 side, and expands and vaporizes on the outdoor heat exchanger 4 side. The vaporized heat medium exchanges heat with the outside air in the outdoor heat exchanger 4, absorbs heat, and returns to the compressor 10 again.

The reason why the check valve 6 and the capillary tube 7 are connected in parallel in the heat medium circulation circuit 8 is that the check valve 6 and the capillary tube 7 are connected in accordance with the difference in the compression ratio of the heat medium between the cooling operation and the heating operation. This is to separate the compression side and the expansion side by one capillary tube 5 during the cooling operation and to separate the compression side and the expansion side by the two capillary tubes 5 and 7 during the heating operation.

Hereinafter, a method of controlling the room temperature in the air conditioner A will be described. The compressor 10 rotates at a constant speed during operation, and starts operating when the room temperature Tr reaches the operation ON temperature T _ON and stops when the room OFF temperature T _OFF . Then, the room temperature controller (not shown) restarts the operation of the compressor 10 after a certain delay time td has elapsed since the room temperature Tr became the operation off temperature T _OFF and the compressor 10 was stopped. A plurality of values T _OFF1 , T _OFF2 ,..., T _OFFn are set for the operation off temperature T _OFF with respect to the set temperature Ts, and one of the values is determined by the temperature control unit according to the state of the heating load. Is set to For example, at the start of operation, the operation off temperature T _OFF is determined based on the difference ΔT from the set temperature Ts and the room temperature Tr near the suction port detected by the room temperature sensor 13, and thereafter, the operation is started from the start of operation of the compressor 10. It can be determined by the time Δt required to reach the temperature T _OFF .

FIG. 2 is a flowchart showing the operation control of the compressor 10 in the air conditioner A of the present invention. When the desired set temperature Ts is input from the control panel or the like and the heating operation is started, the operation OFF temperature T _OFF is set based on the temperature difference ΔT between the set temperature Ts and the room temperature Tr (detected temperature) detected by the room temperature sensor 13. The temperature is set in the temperature control unit (S21), and the compressor 10 is operated (S22) to start heating the room. Further, the temperature control unit starts a timer together with the operation of the compressor 10 (S23), and measures a time Δt until the room temperature Tr reaches the operation off temperature T _OFF . When the room temperature Tr gradually rises and reaches the operation off temperature T _OFF (S24), the temperature control unit stops the operation of the compressor 10 (S25) and stops the timer (S2).
6). Next, after the operation of the compressor 10 is started, the room temperature Tr
There is again operating off temperature T _OFF based on the required time Δt to reach operating off temperature T _OFF is set to the temperature control unit (S27).

When the compressor 10 stops, the room temperature Tr decreases, and the room temperature Tr falls below the operation ON temperature T _ON .
When the room temperature Tr is lower than the operation ON temperature T _ON (S28), after a certain delay time td or more has elapsed since the compressor 10 was stopped to protect the compressor 10 (S29), the compressor 1 is again turned on.
0 is activated (S22). Thus, the compressor 1
The room temperature Tr near the suction port is adjusted to a constant temperature near the set temperature Ts by controlling the operation and stop of the zero.

FIGS. 3 and 4 show how the room temperature is controlled in the air conditioner A of the present invention. FIG.
FIG. 4 shows the state of room temperature control when the heating load is large, for example, when the difference between the set temperature Ts and the outside air temperature is large, such as when the difference between the set temperature Ts and the outside air temperature is large or when the walls, floors, and ceilings of the room are difficult to warm. This shows how the room temperature is controlled when the heating load is small, such as when the temperature is small or when the walls, floors, ceilings, etc. of the room are likely to warm up. Hereinafter, the room temperature control in the air conditioner A will be specifically described with reference to FIGS.

FIG. 3A shows a change in the room temperature Tr (detection temperature) near the suction port and a change in the room temperature Tf (sensible temperature) on the floor surface during the heating operation, and FIG. 10 shows a control (run, stop) state.

When the set temperature Ts is inputted from the control panel of the air conditioner A and the air conditioner A is turned on,
Set temperature Ts and room temperature Tr detected by room temperature sensor 13
(Detection temperature) and the operation off temperature T based on the temperature difference ΔT.
_OFF1 is set in the temperature control unit, the compressor 10 is started, and the heating operation is started.

Table 1 shows an example of the setting of the operation OFF temperature T _OFF immediately after the start of the operation.
The operation-off temperature variable α according to the temperature difference ΔT between the temperature and the room temperature Tr.
Is set in stages, and the operation off temperature T _OFF is T _OFF
= Ts + α (α: operation-off temperature variable).

[0027]

[Table 1]

For example, when the set temperature Ts is set to 22 ° C. and the operation of the air conditioner A is started when the outside air temperature is low and the room temperature Tr near the suction port is 5 ° C., the temperature control unit sets the room temperature Tr and the set temperature Ts. Is calculated by calculating the temperature difference ΔT = Ts−Tr = 17 (° C.), and the operation-off temperature variable α = 3 (° C.), and the operation-off temperature T _OFF is determined as T _OFF1 = Ts + α by the obtained operation-off temperature variable α. = 25 (° C.), and when the room temperature Tr detected by the room temperature sensor 13 reaches 25 ° C., the compressor 10 is stopped. The operation ON temperature T _ON is set to be the same as the set temperature Ts.

When the set temperature Ts is higher than the room temperature Tr,
That is, when the heating load is large, the room temperature Tr gradually reaches the operation OFF temperature T _OFF1 . Room temperature Tr near suction port
_{Reaches the} operation-off temperature T _OFF1 and the compressor 10 stops, and then the room temperature drops sharply due to the large radiation from the room walls, floor, ceiling and the like. At this time, since the operation-off temperature T _OFF1 is set high, the room temperature Tr is large and the operation-on temperature T _OFF1 is large.
It does not fall below _ON .

In this way, the room temperature Tr becomes lower than the operation ON temperature T _ON , and further the delay time td elapses, and when the compressor 10 is _restarted , the room temperature Tr gradually rises, and the room temperature Tr becomes the new operation OFF temperature T _OFF2 . When reached, the compressor 10 stops again. Table 2, there is showing an example of a start of operation after the second and subsequent air conditioners A driving off temperature T _OFF settings, operating off temperature T _OFF at this time to start the previous compressor 10 Is determined in accordance with the time Δt required until the room temperature Tr reaches the operation-off temperature T _OFF . For example, _assuming that it takes 25 minutes (= Δt ₁ ) from the start of the operation of the air conditioner A to the time when the room temperature Tr rises to reach the operation-off temperature T _OFF1 and the compressor 10 stops operating _first. The operation off temperature variable α is + 2 ° C., so the operation off temperature T _OFF2
= Ts + α = 24 (° C.), and the temperature control unit stops the compressor 10 when the room temperature Tr reaches 24 ° C. At this time,
Room temperature, T, because the walls, floor, ceiling, etc. of the room are gradually warming
r is the operation in a short period of time than Δt1 (= Δt ₂₎ off temperature T _OFF2
Reach

[0031]

[Table 2]

When the compressor 10 is stopped, the room temperature Tr gradually decreases again due to radiation from the surroundings, but the walls, floors, ceilings, etc. of the room are gradually warming, and the room temperature decreases more gradually. The operation of the compressor 10 can be restarted while the temperature does not fall below the operation ON temperature T _ON . When the room temperature Tr decreases to the operation ON temperature T _ON in this way, the temperature control unit starts the compressor 10 and the time Δ from the second start of the compressor 10 to the operation OFF temperature T _OFF2.
On the basis of the operation-off temperature variable α corresponding to t2, the operation-off temperature T _OFF3 one step smaller is set in the temperature control unit, and the room temperature T
When r reaches the operation OFF temperature T _OFF3 , the operation of the compressor 10 is stopped. Further, since the walls, floor, ceiling, and the like of the room gradually warm up, the compressor 10 reaches the operation-off temperature T _OFF in a short time after restarting the operation. In this way, the operation-off temperature T _OFF gradually becomes the lowest operation-off temperature T
_OFF , the operation ON temperature T _ON and the operation OFF temperature T
_Room temperature control is performed during the period between _{turning off} and room temperature.

On the other hand, the room temperature Tf near the floor greatly differs from the room temperature Tr near the suction port at the start of operation, and may be lower than the operation on temperature T _ON while the compressor 10 is stopped for a while after the start of operation. However, since the operation-off temperature T _OFF is set to a high temperature, the operation-on temperature T _ON does not fall significantly below the operation-on temperature T _ON, and it does not feel chilly even when the operation of the compressor 10 is stopped. Further, as the walls, floor, ceiling and the like of the room gradually warm up, the temperature difference from the room temperature Tr near the suction port becomes smaller, and the room temperature is controlled to a comfortable room temperature.

Next, the manner of controlling the room temperature when the heating load is small will be described with reference to FIG. FIG. 4A shows a change in the room temperature Tr near the suction port and a change in the room temperature Tf on the floor surface during the heating operation, and FIG. 4B shows a control (operation, stop) state of the compressor 10. ing.

For example, when the set temperature Ts is set to 22 ° C. and the operation of the air conditioner A is started when the outside air temperature is high and the room temperature Tr near the suction port is 10 ° C., the temperature between the room temperature Tr and the set temperature Ts is determined. The difference ΔT is ΔT = Ts−Tr = 12 (° C.)
Therefore, according to Table 1, the operation-off temperature variable α = 2 (° C.)
And the first operation off temperature T _OFF is T _OFF2 = Ts + α =
Set to 24 ° C. The temperature controller stops the compressor 10 when the room temperature Tr detected by the room temperature sensor 13 becomes 24 ° C. When the compressor 10 stops, the room temperature Tr decreases due to radiation from walls, floors, ceilings, and the like of the room. However, since the heating load is small, the room temperature Tr does not drop sharply.
It is not much lower than _ON .

[0036] When the compressor 10 is started again, by operating off temperature variable α temperature control unit in accordance with the required time Δt1 from immediately after the start of operation until the operating off temperature TO _FF2,
A new operation OFF temperature T _OFF3 is obtained, and when the room temperature Tr reaches the operation OFF temperature T _OFF3 , the operation of the compressor 10 is stopped.
Since the heating load is small, the first operation OFF temperature T _OFF (= T
_OFF3 ) The time required to reach is short, for example, 15 minutes from the start of operation of the air conditioner A until the room temperature reaches 24 ° C.
If it takes time (= Δt1), the operation off temperature T _OFF = T _OFF3 (= Ts + α) is set to 23 ° C. based on Table 2, and is set to a lower temperature close to the set temperature Ts.

Further, since the operation off temperature T _OFF is set to a low temperature close to the set temperature Ts in accordance with a small heating load, the room temperature Tf near the floor surface may rise significantly compared with the set temperature Ts. No, it doesn't feel hot. Further, the room temperature Tf near the floor changes at a temperature lower than the room temperature Tr near the suction port, but as the operation time elapses, the temperature difference between the room temperature Tf near the floor and the room temperature near the suction port quickly disappears, It is stabilized at a constant temperature near the set temperature Ts.

As described above, the room temperature Tr reaches the set temperature Ts by changing the operation-off temperature T _OFF in accordance with the condition of the heating load. Also,
By stopping the compressor 10, the room temperature of the entire room, especially the room temperature Tf on the floor surface, does not fall significantly below the set temperature Ts, and the whole room can be stably maintained near the set temperature Ts.

Further, for example, when the outside air temperature decreases during the heating operation and the radiation from the wall, floor, ceiling, etc. of the room increases, the room temperature Tr drops sharply and the room temperature Tr becomes the set temperature T.
It takes a certain time to stabilize the room temperature Tr near the set temperature Ts below s. However, when the heating load increases during the heating operation as described above, the room temperature Tr is maintained so that the room temperature Tr does not fall significantly below the operation off temperature T _OFF by setting the operation off temperature T _OFF to be high again. It is also possible to quickly stabilize around the set temperature Ts.

In this embodiment, the operation ON temperature T
_ON is equal to the set temperature Ts, and the room temperature Tr is set to the set temperature Ts.
Although the room temperature is controlled to a constant temperature within a range not lower than the lower limit, the operation ON temperature T _ON is set lower than the set temperature Ts,
For example, T _ON = Ts−0.5. Thus, by setting the operation on temperature T _ON lower than the set temperature Ts, the set temperature Ts
The room temperature Tr can be controlled within a certain temperature range centered on.

In the above description, the case of the heating operation has been described.
Can be adjusted. In the cooling operation, the operation ON temperature T _ON is set to the set temperature Ts or a temperature slightly higher than the set temperature Ts, and the operation OFF temperature T _OFF is set to a temperature lower than the set temperature Ts. When the cooling load is large, the operation off temperature T _OFF is set at a temperature considerably lower than the set temperature Ts at the start of the operation, and when the cooling load is small, the operation is set at a temperature slightly lower than the set temperature Ts, and the operation is started. The operation off temperature T according to
_You can set it to _OFF .

[0042]

According to the air conditioner of the present invention, the operation is stopped by using any one of the operation-off temperatures according to the cooling / heating load.
The room temperature does not exceed or fall below the set temperature,
Further, the temperature does not fall below or exceed the set temperature despite the small cooling / heating load. Therefore, regardless of the cooling / heating load, the room temperature can be maintained comfortably, and the temperature can be promptly and stably maintained at a constant temperature near the set temperature.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing operation control in the air conditioner according to the first embodiment.

3A is a diagram showing a change in room temperature near the suction port and a change in room temperature near the floor surface when the heating load is large, and FIG. FIG. 6 is a diagram showing a state of operation control of the machine.

FIG. 4A is a diagram showing a change in room temperature near a suction port and a change in room temperature near a floor when a heating load is small during a heating operation by the air conditioner according to the embodiment, and FIG. FIG. 6 is a diagram showing a state of operation control of the machine.

5A is a diagram showing a change in room temperature near the suction port and a change in room temperature near the floor when the heating load is large during a heating operation by the conventional air conditioner, and FIG. Fig. 4 shows a change in room temperature near the suction port and a change in room temperature near the floor surface when is small.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Outdoor unit 4 Outdoor heat exchanger 10 Compressor 13 Room temperature sensor 14 Indoor heat exchanger

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 11/02 F24F 11/02 102 F25B 1/00 341 F25B 13/00 361

Claims (2)

(57) [Claims] 1. An air conditioner controlled to start operation of a compressor if a room temperature is detected and the operation is on, and to stop the compressor if the detected temperature is an operation off temperature. At the start of operation, multiple values are set according to the temperature difference between the set temperature and room temperature.
Set any one of the operation off temperatures
Constant, and operating on the temperature at the previous operation of the compressor after the start of operation
2 depending on the time required to reach the operation-off temperature
Any one of the two or more operation-off temperatures
An air conditioner characterized by setting the degree . (2) After the start of operation, the
When the time required to reach the operation off temperature from the operation on temperature
The operation-off temperature set according to the interval is three or more.
One of the operation-off temperatures
The air conditioner according to claim 1, wherein