JP2503785B2 - Operation control device for 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 operation controller, and more particularly to measures for avoiding an abnormal stop under a heating overload condition.

[0002] Conventionally, as an operation control device for an air conditioner, for example, as disclosed in Japanese Utility Model Laid-Open No. 1-158042 , under heating overload conditions, the high-pressure side pressure and the condensation temperature of the refrigerant reach a set value or higher. Then, it is a well-known technique to avoid an abnormal stop by reducing the air flow rate of the outdoor fan or by stopping the compressor thermo-off.

[0003]

However, the parameters to be controlled such as the high pressure side pressure, the low pressure side pressure, the discharged refrigerant temperature, etc. in the refrigerant circuit of the air conditioner change with the progress of the operation, Moreover, since the change characteristics are different, it is not possible to maintain such control parameters within an appropriate range only by switching the outdoor fan air volume, and so-called high pressure cut, low pressure cut, discharge pipe temperature abnormality, etc. It may cause an abnormal stop. On the other hand, when the compressor is turned off, the sufficient air conditioning effect cannot be obtained during that time, and when the compressor is frequently started and stopped, the reliability is lowered.

The present invention has been made in view of the above problems, and an object thereof is to stop the operation of an outdoor fan under heating overload conditions and the electric expansion valve opening which is a pressure reducing valve, the operation timing and each control. By adjusting according to the change of the parameter, the abnormal stop of the air conditioner can be avoided and the reliability can be improved.

[0005]

In order to achieve the above object, the means taken by the invention of claim 1 is, as shown in FIG. 1 (only the solid line portion), a compressor (1), an outdoor fan (3a).
Refrigerant circuit (9) formed by sequentially connecting an outdoor heat exchanger (3) attached with an electric motor, an electric expansion valve (5) and an indoor heat exchanger (6).
An air conditioner equipped with is assumed.

As an operation control device of the air conditioner, an outside air temperature detecting means (Tha) for detecting the outside air temperature,
An opening that receives the output of the outside air temperature detecting means (Tha) and sets the initial opening of the electric expansion valve (5) to a lower opening as the outside air temperature increases when the compressor (1) starts during heating operation. Upon receiving the outputs of the control means (51) and the outside air temperature detecting means (Tha), the outdoor fan (3a) is operated when the compressor (1) is started during heating operation and the outside air temperature is equal to or higher than a set value. The fan stop means (52) for controlling the stop is provided.

The means taken by the invention of claim 2 presupposes the same air conditioner as that of the invention of claim 1, and as an operation control device of the air conditioner, as shown by the solid line part and the broken line part in FIG. In addition, when the outside air temperature detecting means (Tha) for detecting the outside air temperature and the output of the outside air temperature detecting means (Tha) are received and the outside air temperature is equal to or higher than the set value after the compressor (1) is started during the heating operation. , A fan stop means (52) for controlling the outdoor fan (3a) to stop, a discharge temperature detection means (Th2) for detecting a discharge refrigerant temperature, an output of the discharge temperature detection means (Th2), and heating. If the discharged refrigerant temperature becomes higher than a predetermined temperature after a certain time elapses after the compressor (1) in operation is started, the outdoor fan (3
a) A discharge temperature dependent recovery means (5) for controlling to operate.
3) is provided. . The means taken by the invention of claim 3 is the same as that of the invention of claim 1 shown in FIG.
As indicated by the broken line in FIG. 3, a discharge temperature detecting means (Th2) for detecting the discharge refrigerant temperature and the discharge temperature detecting means (Th2)
The output of the discharge temperature detecting means (Th2) is received after the compressor (1) is started during the heating operation under the condition that the outside air temperature is equal to or higher than the set value, and the discharge refrigerant is discharged until a certain time elapses. When the temperature becomes higher than a predetermined temperature, a discharge temperature dependent return means (53) for controlling the outdoor fan (3a) to operate is provided.

According to the invention of claim 4, in the invention of claim 2 or 3, the condensing temperature detecting means (The) for detecting the condensing temperature of the refrigerant, as shown by the one-dot chain line in FIG. , The outdoor fan (3
High-voltage dependent return means (54) for controlling to operate a)
And are provided.

According to a fifth aspect of the present invention, in the above second, third or fourth aspect of the invention, as shown by a dotted line portion in FIG. 1, when the operation of the outdoor fan (3a) is started, the electric expansion valve ( The opening degree reducing means (55) for reducing the opening degree of 5) is provided.

[0010]

With the above construction, in the invention of claim 1, the outside air temperature detected by the outside air temperature detecting means (Tha) by the opening degree setting means (51) at the time of starting the compressor (1) during the heating operation. Since the opening degree of the electric expansion valve (5) is controlled so that it is higher, the refrigerant circulation amount is suppressed, and when the outside air temperature is equal to or higher than the set value, the outdoor fan ( 3a) is controlled so that the evaporation amount of the refrigerant is suppressed. Therefore, under the heating overload condition, a rapid excessive increase in the high-pressure side pressure at the start-up of the compressor (1) is prevented, and the reliability is improved.

In the inventions of claims 2 and 3, the compressor (1)
When the outside air temperature is equal to or higher than the set value after the start of the, the fan stop means (53) stops the operation of the outdoor fan (3a), and until a certain time elapses after the start of the compressor (1). When the discharge refrigerant temperature detected by the discharge temperature detecting means (Th2) becomes higher than a certain temperature, the discharge temperature dependent restoring means (53) controls the operation of the outdoor fan (3a) so that the outdoor heat The amount of refrigerant evaporated in the exchanger (3) increases, and the amount of refrigerant sucked into the compressor (1) is secured to some extent. Therefore, the discharge refrigerant temperature is prevented from rising excessively.

According to the fourth aspect of the present invention, when the outdoor fan (3a) remains stopped even after a certain period of time has elapsed after the compressor (1) has started, the condensation detected by the condensation temperature detecting means (The). When the temperature becomes equal to or lower than a certain temperature, the high-pressure dependent return means (54) controls the outdoor fan (3a) to operate, so that the pressure on the low pressure side due to the insufficient evaporation amount of the refrigerant in the outdoor heat exchanger (3) is reduced. An abnormal stop of the air conditioner due to an excessive decrease or an excessive rise in the discharged refrigerant temperature can be avoided.

According to the invention of claim 5, when the condition for returning the outdoor fan (3) after the start of the compressor (1) is satisfied and the operation of the outdoor fan (3a) is started, the opening degree reducing means ( 55), the opening of the electric expansion valve (5) is controlled to be reduced, so that the increase in the high-pressure side pressure due to the increase in the refrigerant evaporation amount is mitigated by the decrease in the refrigerant circulation amount, and by this fine adjustment, A good balance between the high-pressure side pressure, the discharged refrigerant temperature, and the low-pressure side pressure is maintained well.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
It will be described with reference to FIG.

FIG. 2 shows a refrigerant piping system of an air conditioner to which the present invention is applied. (1) is a compressor, (2) is a solid line in the figure during cooling operation, and a broken line in the figure is in heating operation. A four-way switching valve to be replaced, (3) an outdoor heat exchanger that functions as a condenser during cooling operation, and an evaporator during heating operation, (4) a receiver for storing liquid refrigerant,
(5) is an electric expansion valve having a function of reducing the pressure of the refrigerant and a function of adjusting the flow rate of the refrigerant, (6) is an indoor heat exchanger that is installed indoors and functions as an evaporator during cooling operation and as a condenser during heating operation, (7) is installed in the suction pipe of the compressor (1) and is an accumulator for removing the liquid refrigerant in the suction refrigerant.
It is

The above-mentioned devices (1) to (7) are sequentially connected by a refrigerant pipe (8), and a refrigerant circuit (9) is constructed so as to generate heat transfer by circulating the refrigerant. Incidentally, (13) is a first supercooling coil provided on the liquid pipe side of the outdoor heat exchanger (3).

On the discharge side of the compressor (1) of the refrigerant circuit (9), an oil recovery unit (10) for recovering the oil in the discharged refrigerant is provided. (10)
From the compressor to the suction pipe between the compressor (1) and the accumulator (7), an oil return passage (11) for returning the oil of the oil recovery device (10) to the suction side of the compressor (1) has a flow control valve. It is provided through (12).

In addition, in the liquid pipe of the refrigerant circuit (9), the receiver (4) and the electric expansion valve (5) are the lower portion of the receiver (4), that is, the liquid portion. Are arranged in series with the common path (8a) so as to communicate with the common path (8a).
The refrigerant from the outdoor heat exchanger (3) to the receiver (4) is provided between the outdoor heat exchanger (3) and the point (P), which is the upper end of the receiver (4) of a). Between the point (P) of the common path (8a) and the indoor heat exchanger (6) by the first inflow path (8b) via the first check valve (D1) that allows only the flow of While being connected by the second inflow passage (8c) via the second check valve (D2) that allows only the flow of the refrigerant from the heat exchanger (6) to the receiver (4), the common passage Point (Q) at the other end of the electric expansion valve (5) of (8a) and the first check valve (D1) -outdoor heat exchanger (3).
A third check valve (D) that allows only the refrigerant to flow from the electric expansion valve (5) to the outdoor heat exchanger (3) between the point (S) and the point (S).
3) via the first outflow path (8d) to the common path (8
From the electric expansion valve (5) to the indoor heat exchanger (6) between the point (Q) in a) and the point (R) between the second check valve (D2) and the indoor heat exchanger (6). The second outflow passages (8e) are connected to each other via the fourth check valve (D4) that allows only the flow of the refrigerant to and from the refrigerant. Also, one point (W) on the receiver upstream side of the common path (8a) and the fourth point of the second outflow path (8e).
A liquid-sealing prevention bypass passage (8f) provided with a capillary tube (C) is provided between the check valve (D4) and a point (U) on the upstream side, and the compressor (1 ) Is designed to prevent liquid sealing when stopped.

A second subcooling coil (14) is provided between the receiver (4) and the electric expansion valve (5) in the common path (8a). That is, as shown in FIG. 3, the first subcooling coil (13) and the second subcooling coil (14) of the outdoor heat exchanger (3) are attached to a common fin. By making the cooling coil divided into the upstream side and the downstream side of the receiver (4), the retention of the gas refrigerant in the receiver (4) and the flush of the electric expansion valve (5) upstream I try to prevent it.

Further, sensors are arranged in the air conditioner, and (Th2) is arranged in the discharge pipe of the compressor (1) to detect a discharge refrigerant temperature T2.
c) is arranged in the liquid pipe of the outdoor heat exchanger (3) and detects the condensation temperature of the refrigerant during the cooling operation and the evaporation temperature of the refrigerant during the heating operation, and (Tha) is the outdoor heat exchanger (3 ), An outside air temperature sensor as an outside air temperature detecting means for detecting the outside air temperature, (The) is arranged in the liquid pipe of the indoor heat exchanger (6), and detects the condensation temperature during the heating operation. An internal heat exchange sensor as a condensation temperature detecting means,
(Thr) is a room temperature sensor that is located at the air intake port of the indoor heat exchanger (6) and detects the temperature of the intake air. (HPS) is a high-pressure switch for protection that operates when the high-pressure side pressure reaches the upper limit and stops abnormally. , (LPS) are protective low-pressure switches that operate and abnormally stop when the low-pressure side pressure reaches the lower limit. The above-mentioned sensors are controllers (not shown) for controlling the operation of the air conditioner. ) Is connected so that a signal can be input thereto, and the controller controls the operation of each device in accordance with the signal from the sensor.

In the refrigerant circuit (9), during the cooling operation, the liquid refrigerant condensed and liquefied in the outdoor heat exchanger (3) flows from the first flow passage (8b) to the common passage (8a) and the receiver ( After being stored in 4) and decompressed by the electric expansion valve (5),
The circulation is returned to the compressor (1) by evaporating in the indoor heat exchanger (6) via the second outflow passage (8e). During the heating operation, the liquid refrigerant condensed and liquefied in the indoor heat exchanger (6) is
After flowing from the flow passage (8c) to the common passage (8a), stored in the receiver (4) and decompressed by the electric expansion valve (5),
The circulation is performed by evaporating in the outdoor heat exchanger (3) through the first outflow passage (8d) and returning to the compressor (1).

Next, regarding the contents of the start control of the compressor (1) by the above controller, the flow chart of FIG.
It will be explained based on the following. First, in step ST1, it is determined whether or not the ON circuits of step ST2 and subsequent steps have been completed, and the controls of steps ST2 to ST10 are executed only while the ON circuits are not completed. In step ST2, the outside air temperature sensor (T
It is determined whether the outside air temperature Ta detected at ha) is lower than the set value 8 (° C). If Ta <8 (° C), it is determined that the overload condition is not satisfied, and the process proceeds to step ST3. Control under normal conditions. That is, the opening degree of the electric expansion valve (5) is set to 250 (pulse) in step ST3, the outdoor fan (3a) is operated in step ST4, and the four-way switching valve (2) is turned on in step ST5. In the heating cycle, the compressor (1) is started in step ST6.

On the other hand, if the result of the determination in step ST2 is Ta
When it is not <8 (° C), that is, the outside air temperature Ta is the set value 8
If the temperature is higher than (° C.), the process proceeds to step ST7 to set the conditions for heating overload activation. That is, in step ST7, it is determined whether Ta <13 (° C.) or not, and Ta
If <13 (° C.), in step ST8, the opening degree of the electric expansion valve (5) is set to 200 (pulse), and Ta <13.
If not (° C), in step ST9, the electric expansion valve (5)
The opening is set to 140 (pulse). And
In step ST10, the operation of the outdoor fan (3a) is stopped, and the process proceeds to step ST5. That is, by controlling the capacity of the outdoor heat exchanger (3) to be small and reducing the refrigerant flow rate, the evaporation amount of the refrigerant is suppressed and high pressure cut due to excessive rise of the high pressure side pressure is avoided. .

Next, when the control of the ON circuit is completed by the above procedure, the process proceeds to step ST11, it is determined whether or not 3 minutes have elapsed after the start of the compressor (1), and until 3 minutes have elapsed, The control following step ST12 is executed. First, in step ST12, a normally open contact (not shown) arranged in parallel with a normally closed contact (not shown) of the protective low pressure switch (LPS) is provided in order to prevent a low pressure cut due to a non-rise of the low pressure side immediately after startup (Fig. After performing LPS short-circuit treatment to close (not shown),
In step ST13, it is determined whether or not the discharge refrigerant temperature T2 detected by the discharge pipe sensor (Th2) is higher than a predetermined temperature 60 (° C), and the outdoor fan (3a) is operated by the control by the ON circuit. If not, that is, under the heating overload condition, the outdoor fan (3a) is maintained in the stopped state until Ta2> 60 (° C) in order to suppress the excessive increase of the high-pressure side pressure, while Ta> 60 ( (° C), in order to avoid an excessive rise in the discharge pipe temperature T2, the process proceeds to step ST14 and the opening degree of the electric expansion valve (5) is set to 90 degrees of the current opening degree.
(%) To suppress the rise of the high-pressure side pressure,
In step ST15, the outdoor fan (3a) is returned to normal operation, the amount of refrigerant evaporated in the outdoor heat exchanger (3) is secured, and the amount of refrigerant circulation is increased.

Further, even if the above control is carried out, the compressor (1) is still operated while the return condition of the outdoor fan (3a) is not satisfied.
When 3 minutes have passed after the startup of
At T16, it is judged whether or not the condensation temperature Tc detected by the internal heat exchange sensor (The) is higher than a constant temperature 45 (° C), and if Tc> 45 (° C), the high pressure rises. The above control is repeated with the outdoor fan (3a) stopped to suppress the above, and when Tc> 45 (° C), that is, when the condensing temperature Tc becomes a constant temperature of 45 (° C) or less, the high pressure side pressure excess When it is determined that the fear of rising has been eliminated, the process proceeds to step ST14, and the operation of the outdoor fan (3a) is returned to normal operation.

In the above flow, steps ST3 and S
The opening setting means (51) according to the invention of claim 1 is configured by the control of T8 and ST9, and the fan stop means (52) is configured by the control of step ST10.
Further, the discharge temperature dependent recovery means (53) according to the invention of claim 2 is constituted by the control proceeding from step ST13 to ST14, ST15, and the high pressure according to the invention of claim 4 is carried out by the control shifting from step ST16 to ST14. The dependence restoring means (54) is constituted, and the opening degree reducing means (55) according to the invention of claim 5 is constituted by the control of step ST15.

Therefore, in the above embodiment, when the compressor (1) is started during the heating operation, the opening degree setting means (51).
The outside temperature T detected by the outside temperature sensor (Tha)
Since the opening of the electric expansion valve (5) is controlled so as to increase as a increases, the circulation amount of the refrigerant is suppressed, and the fan stop means (52) sets the outside air temperature Ta to the set value 8
When the temperature is equal to or higher than (° C.), the outdoor fan (3a) is controlled to be stopped, so that the evaporation amount of the refrigerant is suppressed.
That is, under a heating overload condition, a rapid increase in pressure on the high-pressure side at the time of rising of the compressor (1) is prevented, and reliability is improved.

After starting the compressor (1), the outside air temperature T
When a is equal to or higher than the set value 8 (° C.), the operation of the outdoor fan (3a) is stopped by the fan stop means (53), and the compressor (1) is started for a fixed time (3 minutes).
If the discharge refrigerant temperature T2 detected by the discharge pipe sensor (Th2) becomes higher than the constant temperature 60 (° C.) by the time elapses, the discharge temperature dependent recovery means (53) operates the outdoor fan (3a). Is controlled to return to the normal operation, the amount of refrigerant evaporated in the outdoor heat exchanger (3) increases, and the amount of refrigerant sucked into the compressor (1) is secured to some extent. Therefore, the discharge refrigerant temperature T2 is prevented from rising excessively.

Further, when the outdoor fan (3a) remains stopped even after a certain time (3 minutes) has elapsed after the compressor (1) has started, the condensation detected by the internal heat exchange sensor (The). When the temperature Tc becomes equal to or lower than the constant temperature 45 (° C.), the high pressure dependent recovery means (54) controls the outdoor fan (3a) to operate, so that the evaporation amount of the refrigerant in the outdoor heat exchanger (3) is insufficient. The abnormal stop of the air conditioner due to the excessive decrease of the low pressure side pressure and the excessive increase of the discharge refrigerant temperature T2 due to is avoided.

Further, when the condition for returning the outdoor fan (3) after the activation of the compressor (1) as described above is satisfied and the operation of the outdoor fan (3a) is started, the opening degree reducing means (55). ), The opening degree of the electric expansion valve (5) is controlled to be reduced. Therefore, the increase in the pressure on the high pressure side due to the increase in the evaporation amount of the refrigerant accompanying the start of operation of the outdoor fan (3a) causes It is alleviated by reduction, and by this fine adjustment,
A good balance between the high-pressure side pressure, the discharged refrigerant temperature, and the low-pressure side pressure is maintained well.

Next, air volume control of the outdoor fan (3a) when the internal heat exchange sensor (The) is abnormal will be described with reference to the flow chart of FIG. 5 and the air volume switching characteristic diagram of FIG. Here, T1 to T4 are the first to fourth set temperatures of the outside air temperature Ta set from the low temperature side, respectively. First, in step SR1, it is determined whether or not the internal heat exchange sensor (The) is abnormal. If not abnormal, the process proceeds to step SR2 to perform normal outdoor fan air volume control, and then the internal heat exchange sensor (The).
Is abnormal, steps SR3, SR7, SR8, S
R10 is Ta in order from the lower side of the outside air temperature Ta.
≤T1 or not, Ta ≥T2 or not, Ta ≤T3 or not,
It is determined whether Ta ≥ T4. If Ta ≦ T1 in the determination of step SR3 (region a in FIG. 6), step SR4
The outdoor fan (3a) air volume is set to a high air volume "HH". If Ta ≧ T2 is not satisfied in the determination of step SR7, that is, if T1 <Ta <T2 (region b or c in FIG. 6).
In step SR5, the outdoor fan (3) has a high air volume "HH".
It is further determined whether or not the vehicle is operating in
If it is operated in "H" (region b in Fig. 6),
If the engine is not operating at the high air volume "HH" (region c in FIG. 6), the standard air volume "H" is set in step SR6. If Ta≤T3 in the determination of step SR8 (region d in FIG. 6), the fan air volume is set to the standard air volume "H" in step SR9, and Ta is determined in step SR10.
If ≧ T4 (region g in FIG. 6), that is, if it is an overload condition, the fan air volume is set to the low air volume “L” in step SR11. Further, Ta ≧ T4 in the judgment of step SR11.
If so, that is, if T3 <Ta <T4 (region e or f in FIG. 6), it is determined in step SR12 whether or not the outdoor fan (3a) is currently operated at a low air volume "L". , If it is operated at a low air volume "L" (area f in FIG. 6)
Side), if it is not operated at a low air volume “L” (on the side of region e in FIG. 6), the outdoor fan (3a) is set to the standard air volume “H” in step SR13.

That is, even when the internal heat exchange sensor (The) is abnormal, the outside air temperature Ta detected by the outside air temperature sensor (Tha).
By switching the air volume of the outdoor fan (3a) in accordance with the above, continuous operation of the air conditioner is enabled and the usability is improved.

[0033]

As described above, according to the first aspect of the present invention, when the compressor is started during the heating operation, the opening degree of the electric expansion valve is increased as the outside air temperature detected by the outside air temperature detecting means increases. In addition to throttling, the outdoor fan was stopped when the outside air temperature was above the set value.Thus, by suppressing the refrigerant circulation amount and refrigerant evaporation amount, under heating overload conditions, the sudden high pressure side at the start-up of the compressor It is possible to prevent the pressure from rising excessively, so that the reliability can be improved.

According to the second aspect of the present invention, after the compressor is started, when the outside air temperature is equal to or higher than the set value, the operation of the outdoor fan is stopped, and thereafter, the discharge refrigerant temperature is kept below the constant temperature until a predetermined time elapses. When the temperature becomes higher, the operation of the outdoor fan is started. Therefore, by ensuring the amount of refrigerant sucked into the compressor as the amount of refrigerant evaporated increases, it is possible to prevent the discharge refrigerant temperature from rising excessively.

According to the invention of claim 3, in the invention of claim 1, when the compressor is started under the condition that the outside air temperature is equal to or higher than the set value, the discharge refrigerant temperature is kept within a certain time after the start. When the temperature rises above a certain temperature, the operation of the outdoor fan is started, so while preventing a sudden excessive rise in the high-pressure side pressure when the compressor starts up,
By ensuring the amount of refrigerant sucked into the compressor due to the subsequent increase in the amount of evaporated refrigerant, it is possible to prevent the discharge refrigerant temperature from rising excessively.

According to the invention of claim 4, in the invention of claim 2 or 3, the outdoor fan is operated when the condensation temperature becomes equal to or lower than a certain temperature after a certain time has elapsed after the compressor is started. Therefore, even when the outdoor fan is not operated even after a lapse of a certain time after startup, it is possible to avoid an abnormal stop of the air conditioner due to an excessive decrease in the low-pressure side pressure due to a shortage of the evaporation amount of the refrigerant or an excessive increase in the discharged refrigerant temperature. be able to.

According to the invention of claim 5, above-mentioned claim 2,
In the invention of 3 or 4, when the operation of the outdoor fan is started after the start of the compressor, the opening degree of the electric expansion valve is reduced, so that the increase of the refrigerant evaporation amount and the decrease of the refrigerant circulation amount are fine. By such adjustment, the balance between the high pressure side pressure, the discharge refrigerant temperature, and the low pressure side pressure can be maintained well, and a remarkable effect can be exhibited.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a refrigerant piping system diagram of the air conditioning apparatus according to the embodiment.

FIG. 3 is a diagram showing a configuration of an outdoor heat exchanger and first and second supercooling coils.

FIG. 4 is a flowchart showing the contents of heating overload control.

FIG. 5 is a flowchart showing the details of outdoor fan control according to the second embodiment.

FIG. 6 is a diagram showing an outdoor fan air volume switching characteristic according to the second embodiment.

[Explanation of symbols]

 1 Compressor 3 Outdoor Heat Exchanger 3a Outdoor Fan 5 Electric Expansion Valve 6 Indoor Heat Exchanger 9 Refrigerant Circuit 51 Opening Setting Means 52 Fan Stopping Means 53 Discharge Temperature Dependent Resuming Means 54 High Pressure Dependent Resuming Means 55 Opening Reducing Means Outside Tha Air temperature sensor (outside air temperature detection means) The heat exchange sensor inside (condensation temperature detection means) Thc discharge pipe sensor (discharge temperature detection means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideki Tsujii 1304 Kanaoka-cho, Sakai City, Osaka Prefecture Daikin Industrial Co., Ltd.Kanaoka Factory, Sakai Factory (72) Masahiro Wada 1304, Kanaoka-machi, Sakai City, Osaka Daikin Industrial Co., Ltd. Sakai Mfg. Co., Ltd.Kanaoka Plant (72) Inventor Kouji Uchida 1304 Kanaoka-cho, Sakai City, Osaka Prefecture Daikin Industrial Co., Ltd.Kanaoka Plant, Sakai Plant (72) Masamitsu Kitagishi 1304, Kanaoka-cho, Sakai City, Osaka Daikin Co., Ltd. Kanaoka Factory, Sakai Works Co., Ltd.

Claims (5)

(57) [Claims] 1. A refrigerant circuit (1) in which a compressor (1), an outdoor heat exchanger (3) provided with an outdoor fan (3a), an electric expansion valve (5) and an indoor heat exchanger (6) are sequentially connected. In the air conditioner equipped with 9), when the outside air temperature detecting means (Tha) for detecting the outside air temperature and the output of the outside air temperature detecting means (Tha) are received and the compressor (1) is started during heating operation, When the outside air temperature is higher, the opening degree control means (51) for setting the initial opening degree of the electric expansion valve (5) to a lower opening degree and the outside air temperature detecting means (Tha) are received, and the compressor is in the heating operation. At the start of (1), when the outside air temperature is equal to or higher than a set value, a fan stop means (52) for controlling the operation of the outdoor fan (3a) is stopped, and operation control of the air conditioner. apparatus. 2. A refrigerant circuit (1) in which a compressor (1), an outdoor heat exchanger (3) provided with an outdoor fan (3a), an electric expansion valve (5) and an indoor heat exchanger (6) are sequentially connected. In an air conditioner equipped with 9), after receiving the output of the outside air temperature detecting means (Tha) for detecting the outside air temperature and the outside air temperature detecting means (Tha), after starting the compressor (1) during the heating operation, When the outside air temperature is above the set value, the outdoor fan (3a)
Fan stop means (52) for controlling to stop the
Discharge temperature detection means (Th2) for detecting the discharge refrigerant temperature,
The outdoor fan (3a) receives the output of the discharge temperature detection means (Th2), and when the discharge refrigerant temperature becomes higher than a predetermined temperature after a certain time elapses after the compressor (1) is started during heating operation. And a discharge temperature dependent return means (53) for controlling the operation of the air conditioner. 3. The operation control device for an air conditioner according to claim 1, wherein a discharge temperature detecting means (Th2) for detecting a discharge refrigerant temperature and an output of the discharge temperature detecting means (Th2) are received, and the outside air temperature is changed. After the compressor (1) is started during the heating operation under the condition of the set value or more, the discharge temperature detecting means (Th
When the temperature of the discharged refrigerant becomes higher than a predetermined temperature by the output of 2) until a certain time elapses, the outdoor fan (3
a) A discharge temperature dependent recovery means (5) for controlling to operate.
3) The operation control device for an air conditioner, comprising: 4. The operation control device for an air conditioner according to claim 2 or 3, wherein a certain time has elapsed after the condensing temperature detecting means (The) for detecting the condensing temperature of the refrigerant and the compressor (1) have started. An operation control device for an air conditioner, further comprising: a high-pressure dependent return means (54) for controlling the outdoor fan (3a) to operate when the condensation temperature becomes a predetermined temperature or lower. 5. The operation control device for an air conditioner according to claim 2, 3 or 4, wherein an opening degree reducing means for reducing the opening degree of the electric expansion valve (5) at the start of operation of the outdoor fan (3a). 55) The operation control device for an air conditioner, comprising: