JP3076751U - Operation control device for air conditioner - Google Patents

Abstract

(57) [Summary] [PROBLEMS] During a cooling operation, a refrigerant compressor is controlled at a fixed time in units of one cycle of ON and OFF so as not to repeat ON and OFF operations in a short time. During a cooling operation, an operation control unit (23) preliminarily sets an ON time of the refrigerant compressor (1) based on an indoor detected temperature by an indoor temperature sensor (21) and an ON time and an OFF time of the refrigerant compressor (1) by a timer circuit (22). When it is equal to or shorter than the set comparison reference time Ts, the on-off switching temperature for switching the refrigerant compressor from on to off with respect to the set temperature is further set lower by a certain temperature, and the off-
Set the ON switching temperature higher by a certain temperature,
On / off of the refrigerant compressor 1 is controlled such that the total time of one cycle of the on-time and off-time of the refrigerant compressor 1 becomes a predetermined fixed time Tcns.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is directed to a refrigerant compressor, an indoor heat exchanger, an indoor fan, an outdoor heat exchanger, an outdoor fan, and a structure between the indoor heat exchanger and the outdoor heat exchanger. More specifically, the present invention relates to an air conditioner including a refrigerating cycle formed by an intervening decompressor and a four-way valve for switching the connection between the refrigerant compressor and the indoor heat exchanger or the outdoor heat exchanger. More specifically, the present invention relates to an operation control device of an air conditioner for protecting a refrigerant compressor from repeating on and off operations in a short time during a cooling operation.

[0002]

[Prior art]

 Conventional air conditioners switch the four-way valve so that during cooling operation, the refrigerant compressed by the compressor passes through the four-way valve, outdoor heat exchanger, pressure reducer, indoor heat exchanger, and four-way valve. During heating operation, the refrigerant compressed by the compressor passes through the four-way valve, the indoor heat exchanger, the decompressor, the outdoor heat exchanger, and the four-way valve. Has been circulated.

[0003] During the cooling operation, the air conditioner performs the cooling operation while turning on and off the operation of the refrigerant compressor in order to maintain the room temperature at the set temperature. In this case, for example, when operating a large-capacity air conditioner in a small room, there is a problem that the life of the refrigerant compressor is shortened because the refrigerant compressor repeatedly turns on and off in a short time. Was. Therefore, various techniques have been conventionally proposed to solve such a problem.

[0004] For example, in Japanese Patent Application Laid-Open No. 10-30836, the compressor is stopped when the temperature of the blown air becomes lower than a set temperature (more precisely, a set temperature -1 ° C). Then, the temperature Hi1 of the intake air when the compressor is stopped is stored. When the temperature of the suction air exceeds (Hi1 + 2 ° C.), the compressor is started. The reason why such control is performed is that, when performing the cooling control by the electronic computer, the temperature of the intake air more accurately reflects the indoor condition than the temperature of the blown air. By such control, the number of times the compressor is turned on and off is suppressed (this is referred to as Conventional Technique 1).

[0005] Further, in Japanese Unexamined Utility Model Publication No. 62-9045, the interval time during which the operation of the compressor is turned off is changed in accordance with a set temperature (this is compared with the conventional technology 2 and the prior art 2). Do).

[0006]

[Problems to be solved by the invention]

 However, in the prior art 1, the reference temperature for starting the compressor is controlled only by using the temperature of the intake air that faithfully reflects the actual indoor conditions. Even if the number of times the compressor is turned on and off can be reduced by appropriate control, it is not known at all whether it is the number of times that the compressor was to be turned on or off. In other words, there was a problem that it was not possible to perform a precise control such as suppressing the ON / OFF cycle of the compressor to a certain number of minutes.

In the prior art 2, the off-time of the compressor is taken into account, but the on-time is not taken into account at all, and one cycle of the on / off of the compressor is suppressed to several minutes. There was a problem that total control could not be performed. The present invention has been made to solve such a problem, and its purpose is to perform one cycle of on and off so that the refrigerant compressor does not repeat on and off operations in a short time during cooling operation. It is an object of the present invention to provide an operation control device for an air conditioner that can be controlled for a certain period of time in units of air temperature.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, an operation control device for an air conditioner according to the present invention includes a refrigerant compressor, an indoor heat exchanger, an indoor fan, an outdoor heat exchanger, an outdoor fan, A decompressor inserted between the inner heat exchanger and the outdoor heat exchanger; and a four-way valve for switching the connection between the refrigerant compressor and the indoor heat exchanger or the outdoor heat exchanger. In an air conditioner provided with a refrigeration cycle formed by the above, an indoor temperature detecting means for detecting an indoor temperature, a measuring means for measuring an on time and an off time of the refrigerant compressor, and a control means for controlling the refrigeration cycle During cooling operation, the control means controls the ON time and the OFF time of the refrigerant compressor based on the indoor detected temperature by the indoor temperature detecting means and the ON and OFF times of the refrigerant compressor by the measuring means. One time The total time for Le is, on the refrigerant compressor so that the preset fixed time Tcns, and controlling the off.

According to the present invention having such characteristics, the total time of one cycle of the ON time and the OFF time of the refrigerant compressor is set to a predetermined fixed time Tcns (for example, 10 minutes). Controls ON / OFF of the refrigerant compressor. That is, since the on-time and off-time of the refrigerant compressor are controlled on a cycle-by-cycle basis, the control of the cooling operation itself is repeated in a stable manner. In addition, since the switching of the refrigerant compressor on and off is always controlled to a certain time, such as 10 minutes, the number of times the refrigerant compressor is turned on and off can be reduced as desired.

According to the operation control device for an air conditioner of the present invention, when the ON time of the refrigerant compressor is equal to or less than a preset comparison reference time Ts, the control means sets the refrigerant at a predetermined temperature. The on-off switching temperature for switching the compressor from on to off is set lower by a certain temperature.

[0011] According to the present invention having such features, normally, the switching of the refrigerant compressor from on to off is based on (set temperature -1 ° C) and the indoor temperature is set at (set temperature -1 ° C). ) The refrigerant compressor is switched from on to off when the temperature falls below, but in the present invention, the refrigerant compressor is switched from on to off when the temperature drops to a lower temperature, for example (set temperature -2 ° C) or less. Since the switching is performed, the ON time of the refrigerant compressor can be maintained longer by the amount of 1 ° C lowering.

Further, according to the operation control device for an air conditioner of the present invention, when the ON time of the refrigerant compressor is equal to or less than a preset comparison reference time Ts, the control unit controls the indoor fan. It is characterized in that the rotation speed is switched to a very low speed. According to the present invention having such features, after the indoor temperature falls below the set temperature (more precisely, the set temperature -1 ° C), the rotation of the indoor fan is switched to the ultra-low speed LL, and the indoor temperature is reduced. The cooling operation is continued until the temperature becomes (set temperature -2 ° C) or less. As a result, the indoor cooling action is decelerated, so that the on-time of the refrigerant compressor can be maintained for a longer time, and even for indoor users, there is almost no cool air, so comfortable cooling is provided. There is no worry that the condition will be disturbed.

Further, according to the operation control device for an air conditioner of the present invention, the control means sets the off-on switching temperature for switching the refrigerant compressor from off to on with respect to the set temperature by a further constant temperature. It is characterized by being set high. According to the present invention having such a feature, after the indoor temperature becomes (set temperature -2 ° C) or less and the refrigerant compressor is turned off, the indoor temperature exceeds (set temperature + 1 ° C) (set temperature. + 2 ° C.), the off state of the refrigerant compressor is maintained. That is, the off-time of the refrigerant compressor can be maintained longer as compared with the conventional control.

Further, according to the operation control device for an air conditioner of the present invention, when the ON time of the refrigerant compressor measured by the measuring unit is Ton, the control unit turns off the next refrigerant compressor. When the time Toff becomes Tcns-Ton, the refrigerant compressor is switched from off to on. According to the present invention having such characteristics, it is possible to reliably control the ON / OFF cycle time of the refrigerant compressor to a certain time Tcns.

[0015]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram (refrigeration cycle) of an air conditioner provided with the operation control device of the present invention. In FIG. 1, a discharge port 11 and a suction port 12 of a refrigerant compressor 1 are connected via a four-way valve 2 to one connection port of an indoor heat exchanger 3 having an indoor fan 31 and a chamber having an outdoor fan 51. It is connected to one connection port of the outside heat exchanger 5, and the other connection port of the indoor heat exchanger 3 and the other connection port of the outdoor heat exchanger 5 are connected via the decompressor 4. It is connected. The indoor-side heat exchanger 3 has a configuration in which a conduit temperature sensor 7 for detecting the temperature (substantially the conduit temperature) of the refrigerant flowing in a conduit (not shown) provided therein is attached. I have. The conduit temperature sensor 7 is attached to a location that is not affected by the ventilation of the indoor fan 31. Further, an indoor temperature sensor 21 (see FIG. 2) for detecting the temperature of the intake air (that is, the indoor temperature) is arranged near the air intake port of the indoor unit (not shown).

In the heating operation, the four-way valve 2 is switched to connect the discharge port 11 of the refrigerant compressor 1 to one connection port of the indoor heat exchanger 3, and the suction port 12 of the refrigerant compressor 1 Is connected to one of the connection ports of the outdoor heat exchanger 5, the high-temperature refrigerant compressed by the refrigerant compressor 1 flows as indicated by the solid line arrows in the drawing to heat the room.

That is, the high-temperature refrigerant compressed by the refrigerant compressor 1 is supplied to the indoor heat exchanger 3 through the four-way valve 2, where heat is forcibly exchanged by the indoor fan 31 to heat the room. I do. The refrigerant condensed after completing the heat exchange by the indoor heat exchanger 3 is decompressed by the decompressor 4 and supplied to the outdoor heat exchanger 5, where the refrigerant is forcibly exchanged heat by the outdoor fan 51. The surface temperature of the outdoor heat exchanger 5 is reduced. The refrigerant vaporized after heat exchange by the outdoor heat exchanger 5 is circulated to the refrigerant compressor 1 again through the four-way valve 2.

On the other hand, in the cooling operation, the four-way valve 2 is switched to connect the discharge port 11 of the refrigerant compressor 1 to one connection port of the outdoor heat exchanger 5, and the suction port 12 of the refrigerant compressor 1 Is connected to one connection port of the indoor heat exchanger 3, the high-temperature refrigerant compressed by the refrigerant compressor 1 flows as indicated by broken lines in the figure to cool the room.

FIG. 2 is a block diagram showing an electrical configuration of the operation control device of the present invention. The output of the indoor temperature sensor 21 for detecting the indoor temperature and the output of the timer circuit 22 for measuring the ON time and the OFF time of the refrigerant compressor 1 are transmitted to the operation control unit 23 for controlling the refrigeration cycle shown in FIG. Has been. Further, the operation control unit 23 is configured such that an output of an input unit 24 provided with various switches (not shown) is guided.

The operation control unit 23 executes the refrigeration cycle shown in FIG. 1 in accordance with a program for executing various operation modes (heating operation mode, cooling operation mode, defrost operation mode, etc.) stored in an internal memory (not shown). This is the block to be controlled. During the cooling operation, the operation control unit 23 determines the ON time of the refrigerant compressor 31 based on the indoor detected temperature of the indoor temperature sensor 21 and the ON time and the OFF time of the refrigerant compressor 31 by the timer circuit 22. The on / off control of the refrigerant compressor 1 is controlled so that the total time of one cycle of the off time becomes a predetermined time Tcns (10 minutes in the present embodiment).

In the cooling operation, when the ON time of the refrigerant compressor 1 is equal to or less than a predetermined comparison reference time Ts (3 minutes in the present embodiment), the operation control unit 23 sets the temperature to the set temperature. On the other hand, the on / off switching temperature for switching the refrigerant compressor 1 from on to off (that is, the set temperature -1 ° C) is set lower by a certain temperature (for example, 1 ° C) (that is, the set temperature -2 ° C). .

In the cooling operation, when the ON time of the refrigerant compressor 1 is equal to or less than the comparison reference time Ts (3 minutes) during the cooling operation, the operation control unit 23 determines the rotation speed of the indoor-side fan 31 at that time. The mode is switched from the mode (H, M, or L) to the very low speed (LL). Further, during the cooling operation, the operation control unit 23 switches the refrigerant compressor 1 from off to on with respect to the set temperature when the on time of the refrigerant compressor 1 is equal to or less than the comparison reference time Ts (3 minutes). The off-on switching temperature (that is, the set temperature + 1 ° C) is set higher (ie, the set temperature + 2 ° C) by a certain temperature (for example, 1 ° C).

Further, when the ON time of the refrigerant compressor 1 measured by the timer circuit 22 during the cooling operation is defined as Ton, the operation control unit 23 sets the next OFF time Toff of the refrigerant compressor 1 to Tcns− When Ton is reached, the refrigerant compressor 1 is switched from off to on.

Next, the operation of the air conditioner including the operation control device having the above-described configuration will be described with reference to a flowchart shown in FIG. 3 and a diagram showing a change curve of the room temperature shown in FIG. However, in FIG. 4, a curve shown by a dashed line shows a room temperature curve chart by the conventional cooling operation control. After the temperature setting switch (not shown) of the input unit 24 is operated and the set temperature is stored in the operation control unit 23, when the start switch of the cooling operation (not shown) is operated, the operation signal is transmitted from the input unit 24. It is input to the operation control unit 23. The operation control unit 23 controls the refrigeration cycle based on the operation signal, and starts the cooling operation so that the room temperature is maintained near the set temperature. That is, the refrigerant compressor 1 is turned on (step S1), and measurement of the on-time of the refrigerant compressor 1 by the timer circuit 22 is started (step S2).

When the cooling operation is started in this manner, the operation control unit 23 sets the indoor temperature detected by the indoor temperature sensor 21 and the set temperature stored inside (more precisely, the refrigerant compression with respect to the set temperature). (The on-off switching temperature for switching the unit 1 from on to off), and continue the cooling operation until the room temperature becomes equal to or lower than the on-off switching temperature (set temperature-1 ° C.). When the indoor temperature becomes equal to or lower than the set temperature (-1 ° C.) (determined as Yes in step S3), the on-time Ton of the refrigerant compressor 1 measured by the timer circuit 22 at that time is set in advance. It is determined whether the set comparison reference time Ts (3 minutes) has elapsed (step S4).

As a result, when the ON time Ton of the refrigerant compressor 1 has passed the comparison reference time Ts (3 minutes), the operation proceeds to step S5, and the refrigerant compressor 1 is turned on for the first time ( It is determined whether it is the first ON at the start of operation). If it is the first on, the operation proceeds to step S7, and the refrigerant compressor 1 is turned off. At this time, the operation control unit 23 resets the timer circuit 22 at the same time, and starts measuring the off time of the refrigerant compressor 1 (step S8).

When the refrigerant compressor 1 is turned off, the indoor cooling is stopped, so that the indoor temperature gradually increases. In the operation control unit 23, the indoor temperature detected by the indoor temperature sensor 22 and the set temperature stored inside (more precisely, an off-on for switching the refrigerant compressor 1 from off to on with respect to the set temperature) (Switching temperature) to determine whether or not the room temperature has exceeded the OFF-ON switching temperature (set temperature + 1 ° C.) (step S9). Then, if the room temperature detected by the room temperature sensor 22 exceeds (set temperature + 1 ° C.) (determined to be Yes in step S9), the operation control unit 23 then proceeds to the timer circuit 22 at that time. It is determined whether or not the off time Toff of the refrigerant compressor 1 measured by the above has passed a preset three minutes (step S10).

As a result, when the off time Toff of the refrigerant compressor 1 has passed 3 minutes (when it is determined Yes in step S10), the internal memory not showing the off time Toff (Step S11), the timer circuit 22 is reset (step S12), and the process returns to step S1. The above processing indicates the first on / off operation of the refrigerant compressor 1 immediately after starting the cooling operation, and is a so-called conventional cooling operation control operation.

Then, returning to step S1, the operation control section 23 turns the refrigerant compressor 1 on again, and starts measuring the on-time of the refrigerant compressor 1 by the timer circuit 22 (step S2). When the cooling operation is started again in this manner, the operation control unit 23 compares the room temperature detected by the room temperature sensor 21 with the set temperature stored inside, and determines that the room temperature is (set temperature− (1 ° C) Continue cooling operation until the temperature falls below. Then, when the room temperature becomes equal to or lower than the (set temperature -1 ° C.) (determined as Yes in step S3), the ON time Ton of the refrigerant compressor 1 measured by the timer circuit 22 at that time is set in advance. It is determined whether or not the compared reference time Ts (3 minutes) has elapsed (step S4).

As a result, if the ON time Ton of the refrigerant compressor 1 has passed the comparison reference time Ts (3 minutes), the operation proceeds to step S5, and the refrigerant compressor 1 is turned on for the first time ( It is determined whether it is the first ON at the start of operation). In this case, since it is not the first time, the operation proceeds to step S6, and the ON time Ton of the refrigerant compressor 1 by the timer circuit 22 at that time and the immediately preceding refrigerant compressor 1 held in step S11. It is determined whether or not the total with the off time Toff has passed 10 minutes, which is the fixed time Tcns. If 10 minutes have elapsed, the operation of the refrigerant compressor 1 is turned on and off for one cycle of 10 minutes or more, so that the operation proceeds directly to step S7, and the so-called conventional The cooling operation control will be continued.

On the other hand, when it is determined in step S4 that the on-time Ton of the refrigerant compressor 1 has not passed the comparison reference time Ts (3 minutes), and in step S5, the on-time Ton of the refrigerant compressor 1 is If it is determined that the sum of the time and the off time Toff does not exceed 10 minutes, the operation proceeds to step S13 to shift to the cooling operation control which is a feature of the present invention.

That is, at time t1 (see FIG. 4), the operation control unit 23 first switches the rotation of the indoor fan 31 to the ultra-low speed LL (step S13), and also sets the refrigerant compressor 1 to the set temperature. The on / off switching temperature for switching from ON to OFF is further lowered by 1 ° C from (Set temperature-1 ° C) and changed to (Set temperature-2 ° C). Accordingly, the operation control unit 23 determines whether or not the indoor temperature reaches (the set temperature -1 ° C.) (that is, even if it is the timing to turn off the refrigerant compressor 1 in a normal cooling operation). The refrigerant compressor 1 is kept on until the temperature becomes (set temperature -2 ° C), and the cooling operation is continued.

In this case, usually, the rotation of the indoor fan 31 rotating in any one of the high speed H, the medium speed M, and the low speed L is reduced to the ultra low speed LL, so that the temperature reaches the set temperature. The room's cooling capacity is kept to a minimum so that users in the room do not feel too cold. In the present invention, such an ingenuity makes it possible to maintain the ON time of the refrigerant compressor 1 longer by + α time (see FIG. 4) than the conventional case. However, this + α time is the time that can be gained when the refrigerant compressor 1 is turned off from on, and similarly when the refrigerant compressor 1 is turned on from off, it can be maintained longer by + σ time. Will be described later.

That is, the operation control unit 23 compares the room temperature detected by the room temperature sensor 21 with a newly set on-off switching temperature (set temperature −2 ° C.) inside the room. Continue cooling operation until the temperature falls below (set temperature -2 ° C). Then, at time t2 (see FIG. 4), when the room temperature becomes equal to or lower than the (set temperature−2 ° C.) (determined as Yes in step S14), the refrigerant compression measured by the timer circuit 22 at that time. The on-time Ton of the compressor 1 is stored in an internal memory (not shown) (step S15), and the refrigerant compressor 1 is turned off (step S16). At this time, the operation control unit 23 simultaneously resets the timer circuit 22 and starts measuring the off time of the refrigerant compressor 1 (step S17).

When the refrigerant compressor 1 is turned off, the indoor cooling is stopped, so that the indoor temperature gradually rises. In the present invention, the indoor temperature is immediately increased from time t2. The temperature does not rise, and after a slight temperature drop, the temperature starts to rise. This will be described in more detail.

As described above, in the air conditioner of the present invention, at time t1, the operation is continued without turning off the refrigerant compressor 1, and only the rotation of the indoor fan 31 is switched to the ultra low speed LL. In other words, while the same refrigerant as before is continuously supplied to the indoor heat exchanger 3, the heat exchange capacity of the indoor heat exchanger 3 is reduced. Therefore, the amount of heat (cold heat) that has not been exchanged must be accumulated in the indoor heat exchanger 3 from the time when the rotation of the indoor fan 31 is switched to the ultra-low speed LL (time t1). become. In FIG. 4, a hatched portion (indicated by reference numeral 81) indicates a state until the indoor temperature reaches (the set temperature −2 ° C.) and the refrigerant compressor 1 is turned off (from time t1 to time t2). 2 shows the amount of heat (cold heat) accumulated in the indoor heat exchanger 3 during the period.

That is, at the time t2 when the refrigerant compressor 1 is turned off, the amount of heat corresponding to the area indicated by the reference numeral 81 in FIG. 4 is accumulated in the indoor heat exchanger 3. Therefore, even if the refrigerant compressor 1 is turned off at the time t2, the indoor heat exchanger 3 still releases the heat quantity (the area indicated by reference numeral 81) accumulated at that time (however, spontaneous discharge). During this period, the room temperature decreases, albeit slightly, during the period, and starts to increase when all the heat is released (time t3). The hatched portion indicated by reference numeral 82 in FIG. 4 indicates the amount of heat released (cold heat). That is, the area of the hatched portion indicated by reference numeral 81 is equal to the area of the hatched portion indicated by reference numeral 82.

As described above, according to the cooling operation control according to the present invention, by changing the on-off switching temperature from the conventional (set temperature-1 ° C.) to (set temperature-2 ° C.), this 1 ° C. In addition to extending the on-time and off-time of the refrigerant compressor 1 by the time of the temperature drop and the temperature rise for one minute, the refrigerant is discharged by the heat (cold heat) accumulated in the indoor heat exchanger 3. One feature is that the off time of the compressor 1 can be further extended by + β hours.

Returning to the processing of FIG. 3, after turning off the refrigerant compressor 1 at time t2, the operation control unit 23 sets the indoor temperature detected by the indoor temperature sensor 21 and the newly set off-on inside. The switching temperature (set temperature + 2 ° C.) is compared (step S18), and the refrigerant compressor 1 is kept off until the room temperature exceeds (set temperature + 2 ° C.).

That is, even if the indoor temperature reaches (the set temperature + 1 ° C.) (that is, even if it is the timing to turn on the refrigerant compressor 1 in a normal cooling operation), the operation control unit 23 The off state of the refrigerant compressor 1 is maintained until the indoor temperature becomes (set temperature + 2 ° C.). In the present invention, such an ingenuity enables the off-time of the refrigerant compressor 1 to be maintained longer by + γ time (see FIG. 4) than the conventional case. That is, the off time of the refrigerant compressor 1 can be maintained longer by (β + γ) hours in total than in the case of the conventional cooling operation control.

Then, at time t6 (see FIG. 4), if the room temperature exceeds (set temperature + 2 ° C.) (determined to be Yes in step S18), the operation control unit 23 next sets the refrigerant compression. It is determined whether or not the off time Toff of the machine 1 has passed a time obtained by subtracting the on time Ton held in step S15 from the fixed time Tcns of 10 minutes set in advance (step S19). As a result, when the off time Toff of the refrigerant compressor 1 has passed 10 minutes-Ton time (when it is determined Yes in step S19), the operation proceeds to step S11, and the timer at that time is started. After the off time Toff of the refrigerant compressor 1 measured by the circuit 22 is stored in an internal memory (not shown) (step S11), the timer circuit 22 is reset (step S12), and the process returns to step S1. That is, the refrigerant compressor 1 is turned on again to start the cooling operation.

In this case, the timing for turning on the refrigerant compressor 1 is increased by 1 ° C. from (set temperature + 1 ° C.) to (set temperature + 2 ° C.), compared to the conventional operation control. The ON time of the refrigerant compressor 1 is longer than before by the time σ for cooling the room. That is, the ON time of the refrigerant compressor 1 can be maintained longer by a total of (α + σ) hours than in the case of the conventional cooling operation control. By repeating the above process during the cooling operation, one cycle of the ON / OFF operation of the refrigerant compressor 1 is reliably maintained for 10 minutes, which is the constant time Tcns.

[0043]

[Effect of the invention]

 According to the operation control device of the air conditioner of the present invention, during the cooling operation, the control means is based on the indoor temperature detected by the indoor temperature detecting means and the ON time and the OFF time of the refrigerant compressor by the measuring means. In addition, the on / off of the refrigerant compressor is controlled so that the total time of one cycle of the on time and the off time of the refrigerant compressor becomes a predetermined fixed time Tcns. Thus, the switching on and off of the refrigerant compressor is reliably controlled for a certain period of time, for example, 10 minutes, so that the number of times the refrigerant compressor is turned on and off can be reduced as desired. Further, since the on-time and off-time of the refrigerant compressor are controlled in units of one cycle, the cooling operation itself can be repeatedly controlled in a stable manner.

Further, according to the operation control device for an air conditioner of the present invention, when the ON time of the refrigerant compressor is equal to or less than the preset comparison reference time Ts, the control means controls the refrigerant compressor with respect to the set temperature. The on-off switching temperature for switching from ON to OFF is set lower by a certain temperature. That is, normally, the switching of the refrigerant compressor from on to off is based on (set temperature -1 ° C), and when the indoor temperature falls below this (set temperature -1 ° C), the refrigerant compressor is turned off. In the present invention, the refrigerant compressor is switched from on to off when the temperature becomes lower, for example, (set temperature -2 ° C) or less. The ON time of the compressor can be maintained for a long time.

Further, according to the operation control device for an air conditioner of the present invention, when the ON time of the refrigerant compressor is equal to or less than a preset comparison reference time Ts, the control means controls the rotation speed of the indoor fan. It is configured to switch to ultra-low speed. In other words, after the indoor temperature falls below the set temperature (more precisely, the set temperature -1 ° C), the rotation of the indoor fan is switched to the ultra-low speed LL, and the indoor temperature falls below the set temperature -2 ° C. Since the cooling operation is continued until the air conditioner cools down, the on-time of the refrigerant compressor can be maintained longer because the cooling operation in the room is slowed down. , So that the comfortable cooling condition is not hindered.

Further, according to the operation control device for an air conditioner of the present invention, the control means sets an off-on switching temperature for switching the refrigerant compressor from off to on with respect to the set temperature by a further constant temperature. It is configured to be set high. That is, after the indoor temperature falls below the (set temperature -2 ° C) and the refrigerant compressor is turned off, the refrigerant compression is continued until the indoor temperature exceeds the (set temperature + 1 ° C) and exceeds the (set temperature + 2 ° C). Since the off state of the compressor is maintained, the off time of the refrigerant compressor can be maintained longer than in the conventional cooling operation control.

Further, according to the operation control device for an air conditioner of the present invention, when the on-time of the refrigerant compressor measured by the measuring unit is Ton, the control unit turns off the next refrigerant compressor. When the time Toff becomes Tcns-Ton, the refrigerant compressor is switched from off to on. Thereby, the time of one cycle of ON and OFF of the refrigerant compressor can be reliably controlled to the fixed time Tcns.

[Brief description of the drawings]

FIG. 1 is a system diagram of an air conditioner provided with an operation control device of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the operation control device of the present invention.

FIG. 3 is a flowchart showing a control operation of a cooling operation by the operation control device of the present invention.

FIG. 4 is a diagram showing a change curve of an indoor temperature by a cooling operation control according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 refrigerant compressor 2 four-way valve 3 indoor heat exchanger 4 decompressor 5 outdoor heat exchanger 21 indoor temperature sensor (indoor temperature detecting means) 22 timer circuit 23 operation control unit 24 input unit 31 indoor fan

Claims (6)

[Utility model registration claims] 1. A refrigerant compressor, an indoor heat exchanger, an indoor fan, an outdoor heat exchanger, an outdoor fan, and a space between the indoor heat exchanger and the outdoor heat exchanger An air conditioner having a refrigerating cycle formed by a decompressor interposed in the refrigerant compressor and a four-way valve for switching a connection between the refrigerant compressor and the indoor heat exchanger or the outdoor heat exchanger. Indoor temperature detection means for detecting the on-time and off-time of the refrigerant compressor, and control means for controlling the refrigeration cycle, during cooling operation, the control means, the indoor temperature One of the on-time and off-time of the refrigerant compressor based on the indoor detected temperature by the detecting means and the on-time and off-time of the refrigerant compressor by the measuring means.
The total time of the cycle is a predetermined time Tcn.
An operation control device for an air conditioner, characterized in that on / off of the refrigerant compressor is controlled so as to satisfy s. 2. The operation control device for an air conditioner according to claim 1, wherein the predetermined time Tcns is 10 minutes or more. 3. An on / off switch for switching the refrigerant compressor from on to off with respect to a set temperature when the on time of the refrigerant compressor is equal to or shorter than a preset comparison reference time Ts. The operation control device for an air conditioner according to claim 1 or 2, wherein the temperature is set further lower by a certain temperature. 4. The system according to claim 1, wherein the control unit switches the number of revolutions of the indoor fan to a very low speed when the ON time of the refrigerant compressor is equal to or shorter than a preset comparison reference time Ts. 3. The operation control device for an air conditioner according to item 3. 5. The control device according to claim 3, wherein the control unit sets an off-on switching temperature for switching the refrigerant compressor from off to on to a set temperature higher by a certain temperature. Air conditioner operation control device. 6. The control means sets the on time of the refrigerant compressor measured by the measuring means to Ton, and sets the next off time Toff of the refrigerant compressor to Tcns-Ton.
The air conditioner operation control device according to claim 1, wherein the refrigerant compressor is switched from off to on when the condition is satisfied.