JP5125782B2 - Multi-room air conditioner - Google Patents

Description

  The present invention relates to a multi-room air conditioner in which a plurality of indoor units are connected to a single outdoor unit to form a cooling or heating cycle, and more particularly to control of the compressor frequency and the outdoor fan rotation speed.

  Conventionally, this type of multi-room air conditioner uses outside temperature, pipe length, and operating horsepower as control inputs, detects a high-pressure side pressure with a pressure detector, and detects a detected pressure and a set pressure with a pressure difference calculator. Some have calculated a differential pressure, and determined the compression function force according to the calculated differential pressure (for example, refer patent document 1).

FIG. 10 shows a conventional multi-room air conditioner described in Patent Document 1. As shown in FIG. 10, the capacity control of the compressor 101 is performed by the pressure setting means 105 using the outside air temperature detector 102, the pipe length detector 103, and the operating horsepower number detector 104 as control inputs. A differential pressure between the pressure detected by 106 and the set pressure is calculated by the pressure difference calculator 107, and the capability control determining means 108 determines the compression function force based on the differential pressure.
Japanese Patent Laid-Open No. 4-187930

  However, the conventional configuration requires a pressure detector having a high unit cost as a control input of the compression function force. Further, since the pressure set value is determined by the total capacity rank of the indoor units being operated regardless of the load of the indoor units, there is a problem that overheating occurs at low loads.

  The present invention solves the above-mentioned conventional problems, and can prevent overheating at low loads and ensure efficient heating performance without using a pressure detector with an expensive component unit price. An object is to provide an air conditioner.

In order to solve the conventional problem, in the air conditioner according to claim 1 of the present invention, a variable capacity compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve, an outdoor fan, and an outdoor heat exchanger temperature detecting means. A multi-room air conditioner in which a plurality of indoor units having an indoor heat exchanger and an indoor heat exchanger temperature detecting means are connected to one outdoor unit having an outdoor air temperature detecting means The basic frequency of the compressor is determined according to the capacity rank of the thermo-on indoor unit, the outdoor fan rotation speed is determined from the outside air temperature and the compressor frequency, and the indoor heat exchanger temperatures of all indoor units connected during heating operation are determined. If the detected maximum indoor heat exchanger temperature in all connected indoor units is lower than a certain target condensing temperature threshold, the compressor frequency or outdoor fan speed is reduced until the condensing temperature reaches the certain threshold. When correcting the rise, the first rise compensation But larger than the correction value of the second and subsequent times.

The air conditioner according to claim 2 is a single outdoor unit having a variable capacity compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve, an outdoor fan, an outdoor heat exchanger temperature detecting means, and an outdoor air temperature detecting means. A multi-room air conditioner in which a plurality of indoor units having an indoor heat exchanger and an indoor heat exchanger temperature detection means are connected to the unit, and depending on the capability rank of the thermo-on indoor unit during heating operation The basic frequency of the compressor is determined, the rotational speed of the outdoor fan is determined from the outside air temperature and the compressor frequency, the indoor heat exchanger temperatures of all indoor units connected during heating operation are detected, the indoor intake air temperature and the indoor unit remote controller In a multi-room air conditioner connected to multiple indoor units with differential temperature calculation means for the set temperature, when the maximum indoor heat exchanger temperature in all connected indoor units is lower than a certain target condensation temperature threshold But the indoor intake air Not increase corrected compressor frequency or the outdoor fan speed if the degree indoor unit remote controller set temperature of the differential temperature is low indoor unit is present.

  The multi-room air conditioner of the present invention determines the basic frequency of the compressor according to the capability rank of the thermo-on indoor unit during the heating operation, determines the outdoor fan rotation speed from the outside air temperature and the compressor frequency, and is in the heating operation When the indoor heat exchanger temperature of all connected indoor units is detected and the maximum indoor heat exchanger temperature in all connected indoor units is lower than a certain target condensation temperature threshold, the condensation temperature reaches the certain threshold By increasing the compressor frequency or correcting the outdoor fan rotation speed, the heating temperature can be ensured by detecting the condensing temperature of the refrigeration cycle without using an expensive pressure detector.

According to a first aspect of the present invention, there is provided an indoor heat for one outdoor unit having a variable capacity compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve, an outdoor fan, an outdoor heat exchanger temperature detecting means, and an outdoor air temperature detecting means. A multi-room air conditioner to which a plurality of indoor units having an exchanger and an indoor heat exchanger temperature detection means are connected, and the basic frequency of the compressor according to the capability rank of the thermo-on indoor unit during heating operation The outdoor fan rotation speed is determined from the outside air temperature and the compressor frequency, the indoor heat exchanger temperature of all connected indoor units is detected during heating operation, and the maximum indoor heat exchanger temperature in all connected indoor units is If the compressor frequency or outdoor fan speed is corrected to increase until the condensing temperature reaches a certain threshold value when it is lower than a certain target condensation temperature threshold value, the first increase correction value is the correction value for the second and subsequent times. Make it bigger.

  In this way, the increase in compressor frequency or outdoor fan rotation speed is adjusted to be large for the first time and smaller than the first correction for the second and subsequent times, so that the condensation temperature of the refrigeration cycle can be quickly adjusted to the target condensation temperature without overshooting. And heating performance can be ensured.

According to a second aspect of the present invention, there is provided an indoor heat for a single outdoor unit having a variable capacity compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve, an outdoor fan, an outdoor heat exchanger temperature detecting means, and an outdoor air temperature detecting means. A multi-room air conditioner to which a plurality of indoor units having an exchanger and an indoor heat exchanger temperature detection means are connected, and the basic frequency of the compressor according to the capability rank of the thermo-on indoor unit during heating operation Determine the outdoor fan speed from the outside air temperature and compressor frequency, detect the indoor heat exchanger temperature of all connected indoor units during heating operation, and calculate the difference between the indoor intake air temperature and the indoor unit remote controller set temperature In a multi-room air conditioner to which a plurality of indoor units having a means are connected, the indoor intake air temperature even when the maximum indoor heat exchanger temperature in all the connected indoor units is lower than a certain target condensation temperature threshold And indoor unit remote control Not increase corrected compressor frequency or the outdoor fan speed if the differential temperature of the temperature there is low indoor unit.

  As a result, the heating load requested by the user is detected based on the difference between the indoor intake air temperature and the indoor unit remote controller set temperature, and the maximum indoor heat exchanger temperature in all connected indoor units is constant when the required load is low and the load is low. Even when the temperature is lower than the target condensing temperature threshold, excessive heating can be suppressed without increasing the compressor frequency or the outdoor fan rotation speed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a conceptual diagram of the configuration of a multi-room air conditioner according to a first embodiment of the present invention. 1, the multi-room air conditioner includes a variable capacity compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an outdoor expansion valve 4, an outdoor fan 5, an outdoor heat exchanger temperature detecting means 6, and an outdoor air temperature detecting means. A plurality of indoor units 11n having an indoor heat exchanger 9n, an indoor heat exchanger temperature detecting means 10n, and a remote controller 12n are connected to a single outdoor unit 8 having seven. When the variable capacity compressor 1 is in operation, the indoor heat exchanger 9n becomes a condenser by switching the four-way valve 2 to dissipate heat and enter a heating operation. Moreover, the refrigerant | coolant which became the high pressure state by the compressor is pressure-reduced with the outdoor expansion valve 4, and the outdoor heat exchanger 3 becomes an evaporator, absorbs heat from external air, and comprises the refrigerating cycle. At this time, the maximum temperature of the indoor heat exchanger temperature detection means 10n is recognized as the condensation temperature of the refrigeration cycle.

  FIG. 2 is a control block diagram of the above-described multi-room air conditioner. Reference numeral 13 denotes a basic frequency and a target condensation temperature of the compressor based on operation information from a plurality of indoor units 11n in operation, and an outdoor temperature detection means. 7 is a basic operation condition calculation setting means for setting the fan rotational speed of the outdoor fan 5 by adding temperature information from 7, and 14 is an all-indoor heat exchange for calculating the maximum temperature detected by the indoor heat exchanger temperature detection means 10n. An indoor unit condensing temperature determining means, 15 is an indoor unit condensing temperature determining means for comparing the output from the all indoor heat exchanger maximum temperature calculating means 14 with a target condensing temperature to determine whether it is below the target condensing temperature, An outdoor fan rotational speed correcting means for correcting the outdoor fan rotational speed based on an output from the machine condensing temperature determining means 15 or an outdoor fan rotational speed upper limit determining means 19 described later; An outdoor fan rotation speed calculation setting means 18 for calculating and setting the rotation speed of the outdoor fan based on the output from the engine rotation speed correction means 16, 18 is based on the outputs from the outside air temperature detection means 7 and the outdoor heat exchanger temperature detection means 6. The outdoor air temperature-outdoor heat exchanger differential temperature calculation determination means 19 for calculating and calculating the differential temperature, 19 is the upper limit of the outdoor fan rotation speed corresponding to the differential temperature from the outside air temperature-outdoor heat exchanger differential temperature calculation determination means 18 The outdoor fan rotation speed upper limit determination means 20 for determining whether or not the pressure has reached the compressor frequency correction for correcting the compressor frequency based on the output from the outdoor fan rotation speed upper limit determination means 19 or the indoor unit condensation temperature determination means 15 Means 21 designates the compressor frequency based on the output from the compressor frequency correction means 20, and outputs the compressor frequency calculation setting means 25 to the compressor 1. Reference numeral 25 designates outdoor fan rotation. Including the correction means 16 and the compressor frequency correction unit 20, an operating condition correction means.

  The operation and action of the multi-room air conditioner based on this control block diagram will be described below using the flowchart of FIG.

  In the heating operation compression function control (STEP 0), the outdoor unit 8 first recognizes the operation stop state of the plurality of indoor units 11n, and the basic operation condition calculation setting means 13 determines whether the indoor unit 11n is operating according to the state. The stored indoor functional power rank is received (STEP 1). The basic operation condition calculation setting means 13 of the outdoor unit 8 is based on a comparison table of the indoor functional force rank and the compressor operation frequency stored in the basic operation condition calculation setting means 13 or a predetermined arithmetic expression. Is determined and recognized (STEP 2). Next, the outside air temperature detection means 7 recognizes the outside air temperature (STEP 3), and the basic operation condition calculation setting means 13 calculates the outdoor fan rotation speed based on a comparison table with a basic frequency or a predetermined arithmetic expression (STEP 4). Subsequently, the temperature of the connected all indoor unit heat exchanger is detected by the heat exchanger temperature detecting means 10n of all the connected indoor units (STEP 5), and the maximum temperature among the indoor unit heat exchangers is calculated as the maximum temperature calculating unit for all the indoor heat exchangers. 14 (STEP 6), and the calculated maximum temperature in the indoor unit heat exchanger temperature is compared with the target condensing temperature set in advance by the basic operating condition calculation setting means 13 according to the indoor functional power rank received in STEP 1. Condensation temperature determination (STEP 7) of whether the temperature is lower than the target condensation temperature is performed.

  As a result of the determination, if the temperature is equal to or higher than the target condensation temperature (NO in STEP 7), the outdoor fan rotation speed is determined to be the outdoor fan rotation speed calculated in STEP 4 (STEP 13), and the compressor frequency is recognized in STEP 2 (STEP 14), and shifts to indoor functional capability rank reception (STEP 1).

When the temperature is lower than the target condensation temperature (YES in STEP 7), the temperature difference between the outdoor heat exchanger temperature detected by the outdoor heat exchanger temperature detecting means 6 (STEP 8) and the outdoor air temperature detected in STEP 3 is calculated. Is determined to exceed a certain threshold value (STEP 9). If the temperature difference exceeds a certain threshold value (STEP 9: Yes), it is further determined whether the outdoor fan speed has reached the upper limit speed (STEP 10), and has reached the upper limit speed. If not (STEP 10: Yes), the outdoor fan rotation speed is corrected for increase (STEP 11), the outdoor fan rotation speed is determined (STEP 13), and the process proceeds to indoor functional force rank reception (STEP 1). When the difference between the outdoor air temperature and the outdoor heat exchanger temperature does not exceed a certain threshold value (No in STEP 9), and when the outdoor fan rotation speed has reached the upper limit rotation speed (No in STEP 10), The compressor frequency is corrected to increase (STEP 12), the compressor operating frequency is determined (STEP 14), and the process proceeds to indoor functional force rank reception (STEP 1).

  From the above, in this embodiment, the condensing temperature of the refrigeration cycle is detected at the maximum value of the indoor heat exchanger temperature in the connected indoor unit without using an expensive pressure detector, and the condensing temperature is constant. When the temperature is lower than the target condensing temperature threshold, until the condensing temperature reaches a certain threshold, or the difference between the outside air temperature and the outdoor heat exchanger temperature is equal to or greater than the certain threshold, and the outdoor fan rotates at the upper limit. If the number does not reach the number, it is determined that heat can be absorbed from the outside air, and the outdoor fan rotation speed is corrected until the condensation temperature reaches a certain threshold value. Increase the compressor frequency until it reaches. Thus, the heating operation can be performed at the target condensation temperature, and the heating performance can be ensured. Further, not only the compressor frequency correction but also the correction based on the fan speed can be combined to reduce the power consumption.

(Embodiment 2)
FIG. 4 is a flowchart of the multi-room air conditioner according to the second embodiment of the present invention. In this embodiment, the control block diagram is the same as that of the first embodiment, but the control flow is partially different. Therefore, the same reference numerals are used for the same flow parts, and the description is omitted, and different parts will be described. .

  In the second embodiment, after determining whether or not the outdoor fan speed has reached the upper limit speed (STEP 10), if the upper speed has not been reached (Yes in STEP 10), the outdoor The fan rotational speed is corrected to increase at a constant ratio (STEP 111), the outdoor fan rotational speed is determined (STEP 13), and the process proceeds to indoor functional force rank reception (STEP 1). When the difference between the outside air temperature and the outdoor heat exchanger temperature does not exceed a certain threshold (No in STEP 9) and when the outdoor fan rotation speed has reached the upper limit rotation speed (No in STEP 10), compression is performed. The machine frequency is corrected to increase at a constant ratio (STEP 112), the compressor operating frequency is determined (STEP 14), and the process proceeds to indoor functional rank reception (STEP 1).

  In the second embodiment, similarly to the first embodiment, it is possible to perform heating operation at a target condensation temperature by reliably increasing and correcting the outdoor fan rotation speed and the compressor frequency, Heating performance can be ensured. In addition, since the correction is performed at a constant ratio, the circuit configuration can be simplified.

(Embodiment 3)
FIG. 5 is a flowchart of the multi-room air conditioner according to the third embodiment of the present invention. In FIG. 5, the same components as those in FIGS. 3 and 4 are denoted by the same reference numerals, and the description thereof is omitted.

In the third embodiment, after determining whether or not the outdoor fan rotation speed has reached the upper limit rotation speed (STEP 10), if the upper limit rotation speed has not been reached (YES in STEP 10), the outdoor fan It is determined (STEP 201) whether the rotation speed increase correction is the first time. When the upward correction is the first time (Yes in STEP 201), the outdoor fan rotational speed correction means 16 performs the initial outdoor fan rotational speed increase correction (STEP 203), determines the outdoor fan rotational speed (STEP 13), and receives the indoor functional force rank ( Move to STEP1). When the upward correction is not the first time (No in STEP 201), the outdoor fan rotational speed increase correction (STEP 202) less than the initial outdoor fan rotational speed increase correction is performed, the outdoor fan rotational speed is determined (STEP 13), and the indoor functional force rank is received ( Move to STEP1).

  When the difference between the outside air temperature and the outdoor heat exchanger temperature does not exceed a certain threshold (No in STEP 9) and when the outdoor fan rotation speed has reached the upper limit rotation speed (No in STEP 10), compression is performed. It is determined whether or not the machine frequency increase correction is the first time (STEP 204). If the increase correction is the first time (STEP 204, Yes), the first compressor frequency increase correction (STEP 205) is performed, the compressor frequency is determined (STEP 14), and the process proceeds to indoor functional capability rank reception (STEP 1). When the increase correction is not the first time (No in STEP 204), the compressor frequency increase correction (STEP 206) less than the initial compressor frequency increase correction is performed, the compressor operating frequency is determined (STEP 14), and the indoor functional force rank reception (STEP 1). Migrate to

  In the third embodiment, similarly to the first and second embodiments, the heating operation is performed at the target condensing temperature by steadily correcting the increase in the outdoor fan rotation speed and the compressor frequency. The heating performance can be ensured. Furthermore, by increasing the increase in the outdoor fan speed and compressor frequency at the first time and making it smaller than the first correction after the second time, the condensation temperature of the refrigeration cycle can be quickly and overshooted to the target condensation temperature. It becomes possible to adjust.

(Embodiment 4)
FIG. 6 is a control block diagram of the multi-room air conditioner according to the fourth embodiment of the present invention. The present embodiment is different from the previous embodiment in that an indoor unit condensation temperature difference temperature determination means 23 is provided. This indoor unit condensation temperature difference temperature determination means 23 is output from the outdoor fan rotation speed upper limit determination means 19. Is used to determine the temperature difference between the above-described all-indoor heat exchanger maximum temperature and the target condensation temperature.

  FIG. 7 is a flowchart of the multi-room air conditioner according to the fourth embodiment of the present invention. In FIG. 7, the same reference numerals are used for the same flow portions as those in FIGS. 3, 4, and 5, description thereof is omitted, and different portions are described.

  In the fourth embodiment, after determining whether or not the outdoor fan rotation speed has reached the upper limit rotation speed (STEP 10), if the upper limit rotation speed has not been reached (YES in STEP 10), the indoor unit The difference temperature between the maximum indoor heat exchanger temperature and the target condensation temperature is calculated by the condensation temperature difference temperature determining means 23 (STEP 301), and it is determined whether the target condensation temperature difference temperature is, for example, 5K or more (STEP 302). Rotational speed increase correction (STEP 304) is performed, and when the target condensing temperature differential temperature is less than 5K (NO in STEP 302), outdoor fan rotational speed increase correction (STEP 303) set below the outdoor fan rotational speed increase correction when the differential temperature is 5K or higher. The outdoor fan rotation speed is determined (STEP 13), and the process proceeds to indoor functional power rank reception (STEP 1).

  When the difference between the outdoor air temperature and the outdoor heat exchanger temperature does not exceed a certain threshold (No in STEP 9) and when the outdoor fan rotation speed has reached the upper limit rotation speed (No in STEP 10), The difference temperature between the maximum heat exchanger temperature and the target condensation temperature is calculated (STEP 305), and it is determined whether the target condensation temperature difference temperature is, for example, 5K or more (STEP 306). Further, when the target condensing temperature differential temperature is 5K or more (Yes in STEP 306), the compressor frequency increase correction (STEP 307) is performed when the differential temperature is 5K or more, and when the target condensing temperature differential temperature is less than 5K (NO in STEP 306). The compressor frequency is determined (STEP 308) by the compressor frequency increase correction (STEP 308) set below the compressor frequency increase correction when the temperature difference is 5K or more, and the process proceeds to indoor functional force rank reception (STEP 1).

  In the fourth embodiment, as in the first, second, and third embodiments, the target condensation temperature is obtained by steadily correcting the increase in the outdoor fan rotation speed and the compressor frequency. The heating operation can be carried out at the same time, and the heating performance can be ensured. Furthermore, in this embodiment, the condensation temperature of the refrigeration cycle is quickly overshot to the target condensation temperature by determining the temperature difference between the outdoor fan rotation speed and the compressor frequency and the target condensation temperature. It can be adjusted without heating performance.

(Embodiment 5)
FIG. 8 is a control block diagram of the multi-room air conditioner according to the fifth embodiment of the present invention. The present embodiment is different from the previous embodiments in that a heating load determination unit 25 is further provided. This heating load determination unit 25 includes an intake air temperature detection unit 24 and a remote control set temperature detection unit 12 of each indoor unit. Is used to determine the heating load of the multi-room air conditioner.

  FIG. 9 is a flowchart of the multi-room air conditioner according to the fifth embodiment of the present invention. In FIG. 9, the same reference numerals are used for the same flow portions as those in FIGS. 3, 4, 5, and 7, and description thereof is omitted, and different portions are described.

  In the fifth embodiment, after the maximum temperature in the indoor unit heat exchanger temperature is calculated by all indoor heat exchanger maximum temperature calculation means 14 (STEP 6), the difference between the intake air temperature of each indoor unit and the remote controller set temperature is calculated. The heating load state of each indoor unit is grasped by calculating the temperature (STEP 401), and there is an indoor unit in which the difference between the intake air temperature of each indoor unit and the remote controller set temperature is 1K or less by the heating load determination (STEP 402), for example. Judge whether to do. When there is an indoor unit having a temperature difference between each indoor unit intake air temperature and the remote controller set temperature of, for example, 1K or less (No in STEP 402), the compressor operating frequency is determined in STEP 2 and recognized (STEP 13). Then, it shifts to indoor functional capability rank reception (STEP 1). If there is no indoor unit with a temperature difference between each indoor unit intake air temperature and the remote controller set temperature of 1K or less (Yes in STEP 402), the maximum temperature in the indoor heat exchanger temperature is compared with the target condensation temperature, and the target condensation Condensation temperature determination (STEP 7) of whether the temperature is lower is performed.

  When the temperature is equal to or higher than the target condensation temperature (No in STEP 7), the outdoor fan speed is determined to be the outdoor fan speed calculated in STEP 4 (STEP 13), the basic frequency is determined and recognized (STEP 2), and the compressor operating frequency is determined. Decide (STEP 13) and proceed to indoor function rank reception (STEP 1). When the temperature is lower than the target condensation temperature (Yes in STEP 7), the difference temperature between the outdoor heat exchanger temperature detected by the outdoor heat exchanger temperature detecting means (STEP 8) and the outdoor air temperature detected in STEP 3 is calculated. It is determined whether or not a certain threshold value is exceeded (STEP 9). If the temperature difference exceeds a certain threshold (STEP 9: Yes), it is further judged whether the outdoor fan speed has reached the upper limit speed (STEP 10), and has not reached the upper limit speed. In the case (YES in STEP 10), the outdoor fan rotational speed is corrected to be increased (STEP 11), the outdoor fan rotational speed is determined (STEP 13), and the process proceeds to indoor functional force rank reception (STEP 1). When the difference between the outside air temperature and the outdoor heat exchanger temperature does not exceed a certain threshold (No in STEP 9) and when the outdoor fan rotation speed has reached the upper limit rotation speed (No in STEP 10), compression is performed. The machine frequency is corrected to be increased (STEP 12), the compressor operating frequency is determined (STEP 14), and the process proceeds to indoor functional force rank reception (STEP 1).

In the fifth embodiment, as in the first, second, third, and fourth embodiments, the increase in the outdoor fan rotation speed and the compressor frequency is steadily corrected, thereby achieving the target. Heating operation can be performed at a condensing temperature, and heating performance can be ensured. Furthermore, in the present embodiment, the heating load requested by the user is detected based on the difference between the indoor intake air temperature and the indoor unit remote controller set temperature, and when the required load is low, the maximum indoor heat exchange among all connected indoor units is detected. Even when the chamber temperature is lower than a certain target condensing temperature threshold, the outdoor fan speed and compressor frequency are not corrected to increase, and overheating can be suppressed, saving energy during operation of the air conditioner The effect can be expected.

  As described above, the multi-room air conditioner according to the present invention detects the condensing temperature of the refrigeration cycle at the maximum indoor heat exchanger temperature in the connected indoor unit without using a pressure detector with an expensive part price. If the condensing temperature is lower than a certain target condensing temperature threshold, the compressor frequency or outdoor fan speed can be corrected to increase from the outside air temperature until the condensing temperature reaches the certain threshold. If heat absorption is possible, the outdoor fan speed can be corrected, otherwise the compressor frequency can be corrected to perform heating operation at the target condensing temperature to ensure heating performance, and one indoor unit and one It can also be applied to single models that connect other outdoor units, simultaneous twin models, and heat storage type multi-room air conditioners.

Configuration conceptual diagram of multi-room air conditioner in Embodiments 1 to 5 of the present invention Control block diagram of multi-room air conditioner according to Embodiments 1, 2, and 3 of the present invention The flowchart which shows the control in Embodiment 1 of this invention. The flowchart which shows the control in Embodiment 2 of this invention. The flowchart which shows the control in Embodiment 3 of this invention. Control block diagram in Embodiment 4 of the present invention Flowchart showing control in the fourth embodiment Control block diagram in Embodiment 5 of the present invention Flowchart showing control in the fifth embodiment Control block diagram of a conventional multi-room air conditioner

DESCRIPTION OF SYMBOLS 1 Capability variable compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Outdoor expansion valve 5 Outdoor fan 6 Outdoor heat exchanger temperature detection means 7 Outside air temperature detection means 8 Outdoor unit 9n Indoor heat exchanger 10n Indoor heat exchanger temperature detection means 11n Indoor unit 12n Remote controller 13 Basic operation condition calculation setting means 14 Indoor heat exchanger maximum temperature calculation means 15 Indoor unit condensation temperature determination means 16 Outdoor fan rotation speed correction means 17 Outdoor fan rotation speed calculation setting means 18 Outdoor air temperature-outdoor heat exchange Unit differential temperature calculation determination means 19 Outdoor fan rotation speed upper limit determination means 20 Compressor frequency correction means 21 Compressor frequency calculation setting means 22 Target condensation temperature calculation setting means 23 Indoor unit condensation temperature difference temperature determination means 24 Intake air temperature detection means 25 Heating load determination means 101 Compressor in conventional air conditioner 102 Outside air temperature detector 103 Same as above Pipe length detector 104 Same operating horsepower number detector 105 Same pressure setting means 106 Same pressure detector 107 Same pressure difference calculator 108 Same capacity control determining means STEP0 Heating operation compression function force control STEP1 Indoor function force rank reception STEP2 Basic frequency determination Recognition STEP3 Outdoor air temperature detection STEP4 Outdoor fan rotation speed calculation STEP5 Connected all indoor unit heat exchanger temperature detection STEP6 Connected all indoor unit heat exchanger temperature maximum value STEP7 Condensation temperature determination STEP8 Outdoor heat exchanger temperature detection STEP9 Outdoor air temperature outdoor heat exchange STEP 10 Determination of outdoor temperature difference of temperature of the outdoor unit STEP 10 Determination of upper limit of outdoor fan speed STEP 11 Correction of increase in outdoor fan speed STEP 12 Correction of increase in compressor frequency STEP 13 Determination of outdoor fan speed STEP 14 Determination of compressor frequency

Claims (2)

An indoor heat exchanger and an indoor heat exchange for one outdoor unit having a variable capacity compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve, an outdoor fan, an outdoor heat exchanger temperature detecting means, and an outdoor air temperature detecting means. A multi-room air conditioner connected to a plurality of indoor units having a unit temperature detecting means, and determining a basic frequency of the compressor according to a capability rank of the thermo-on indoor unit during heating operation, The outdoor fan rotation speed is determined from the compressor frequency and the indoor heat exchanger temperature of all connected indoor units during heating operation is detected, and the maximum indoor heat exchanger temperature in all connected indoor units reaches a certain target condensation temperature. When lower than the threshold value, when increasing the compressor frequency or outdoor fan rotation speed until the condensation temperature reaches a certain threshold, the first increase correction is larger than the second and subsequent correction values. multi-room air conditioner you. An indoor heat exchanger and an indoor heat exchange for one outdoor unit having a variable capacity compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve, an outdoor fan, an outdoor heat exchanger temperature detecting means, and an outdoor air temperature detecting means. A multi-room air conditioner connected to a plurality of indoor units having a unit temperature detecting means, and determining a basic frequency of the compressor according to a capability rank of the thermo-on indoor unit during heating operation, The number of outdoor fan rotations is determined from the compressor frequency, the indoor heat exchanger temperature of all indoor units connected during heating operation is detected, and a plurality of units having a temperature difference calculating means between the indoor intake air temperature and the indoor unit remote controller set temperature In a multi-room air conditioner to which indoor units are connected, the indoor intake air temperature and the indoor unit remote control set temperature even when the maximum indoor heat exchanger temperature in all the connected indoor units is lower than a certain target condensation temperature threshold Temperature difference There multi-room air conditioner you characterized in that it does not rise corrected compressor frequency or the outdoor fan speed if the indoor unit is present.

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