JP2005133970A - Air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively control equipment without impairing comfortability while avoiding the destruction of a compressor due to sharp suction pressure rise of the compressor by performing heat exchange after increasing the frequency of the compressor when starting the cooling or dehumidifying operation of an indoor unit during operation with an evaporating temperature being high in other rooms. <P>SOLUTION: In the case of determining that the indoor unit has cooling or dehumidifying operation in other rooms, when a value for a suction pressure detecting device 9 is greater than a set value LPa, the stop of an indoor blower 12 or the operation of an solenoid expansion valve 13 with a slightly opening pulse Pexmin (or in a fully closed state) is controlled for a predetermined time after starting operation. When the value of the suction pressure detecting device 9 is smaller than a set value LPb (LPb=LPa-1kg/cm2G), that the compressor starts increasing the frequency is determined and the operation of the blower 12 or the operation of the solenoid expansion valve 13 with an initial opening Pex is controlled to be started. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a multi-chamber air conditioner that variably controls a capacity (frequency) variable compressor by an inverter.

Conventionally, this type of air conditioner uses a variable capacity (frequency) compressor, and when one or more units are cooled (or dehumidified) during the cooling (or dehumidification) operation, At the same time, the electromagnetic expansion valve of the additional operation indoor unit is set to the initial setting value (preset initial setting value corresponding to the indoor required load), and the blower of the additional operation indoor unit starts operation with the remote control setting value. The frequency of the capacity (frequency) variable compressor increased according to the required load of the indoor unit that was started (see, for example, Patent Document 1).
JP-A-53-53145

  However, in the conventional air conditioner, the electromagnetic expansion valve of the additional operation indoor unit is set to the initial setting value at the same time as the start of the additional operation (initial setting value set in advance according to the indoor required load), and the blower of the additional operation indoor unit is Operation starts with the remote control set value, but because the outdoor unit controls the frequency rise and fall at regular intervals, there is a time difference in the response of the indoor unit and the outdoor unit to the required load (maximum control interval time) A minute shift).

  Therefore, before the compressor frequency increases, the blower of the indoor unit may be operated to set the electromagnetic expansion valve to the initial set value and start the operation. In such a case, the evaporation temperature (suction pressure) temporarily rises abruptly until the compressor frequency rises.

  In addition, even if the time lag is slight, there is a limit for compensating the reliability of the speed of increase in the frequency of the compressor, so the compressor frequency must be gradually increased. (Suction pressure) temporarily increases suddenly. This increase in the evaporation temperature (suction pressure) increases the bearing load of the compressor, which may damage the thrust bearing and significantly reduce the reliability of the compressor.

  In order to avoid the above problems, the evaporation temperature during operation (compressor suction pressure) must be set lower than the compressor specifications in anticipation of pressure increase during additional operation, and the required load is low. However, if the compressor frequency is increased and the suction pressure is reduced (if the required load is low, it is not possible to save the operation by reducing the compressor frequency), the evaporation temperature can be avoided to prevent condensation in the indoor unit. However, because it was not possible, we took measures to avoid condensation in the indoor unit by increasing the air volume and changing the direction of the wind, and we were operating with a slight loss of comfort.

  The present invention eliminates the above-mentioned conventional drawbacks, and effectively controls equipment while protecting equipment such as a compressor and without impairing comfort.

  In order to solve the above problems, the present invention connects an outdoor unit having a variable capacity compressor, an outdoor heat exchanger, a blower, a refrigerant liquid pipe, a refrigerant gas pipe, and a plurality of indoor units having a heat exchanger and a blower. An electric refrigerant expansion valve is interposed between the refrigerant liquid pipe of the indoor unit and the indoor heat exchanger to form a refrigeration cycle. When one indoor unit starts cooling or dehumidifying operation, the other indoor units A control device is provided for gradually opening the expansion valve from the closed state during operation by cooling or dehumidification.

  Further, a plurality of outdoor units having a variable capacity compressor, an outdoor heat exchanger, a blower, a refrigerant liquid pipe, and a refrigerant gas pipe and an indoor unit having a heat exchanger and a blower are connected, and the refrigerant liquid pipe and the indoor heat are connected. An electric refrigerant expansion valve is interposed between the exchangers to constitute a refrigeration cycle, and at least a refrigerant suction pipe of the outdoor unit is provided with a suction pressure detection device, and when the cooling or dehumidifying operation starts, the signal of the suction pressure detection device In the air conditioner provided with a control device for controlling the air volume of the blower according to the operation status of the other room, when the other indoor unit is operating in the cooling or dehumidifying operation when the one indoor unit starts the cooling or dehumidifying operation, the suction When the value of the pressure detection device is higher than the predetermined pressure value, the indoor blower is operated at the minimum air volume for a predetermined time or stopped.

  Further, a plurality of outdoor units having a variable capacity compressor, an outdoor heat exchanger, a blower, a refrigerant liquid pipe, and a refrigerant gas pipe, and an indoor unit having a heat exchanger and a blower are connected, and the refrigerant liquid pipe of the indoor unit And the indoor heat exchanger, an electric refrigerant expansion valve is interposed to constitute a refrigeration cycle, and one indoor unit detects the temperature of the heat exchanger of the other indoor unit. When the other room is operating in the cooling or dehumidifying operation when the cooling or dehumidifying operation is started, if the value of the other-room indoor heat exchanger temperature detecting device is higher than the predetermined temperature value, until the temperature falls below the predetermined temperature return value The expansion valve is operated slightly opened or closed.

  According to the above-described invention, it is possible to control a device effectively while suppressing a sudden increase in suction pressure, protecting a device such as a compressor, and not impairing comfort.

  The air conditioner of the present invention can avoid a sudden rise in evaporation pressure due to a sudden increase in indoor heat exchange capacity before a compressor frequency rise, can avoid a compressor breakdown due to a rise in compressor suction pressure, and can improve the reliability of equipment. In addition, the reliability of the compressor is improved.

  In addition, this makes it possible to operate the air conditioner while protecting equipment such as a compressor and not impairing comfort.

  In addition, the air flow down time can be shortened, the comfort can be further improved, and the air conditioner can be operated without impairing the comfort while protecting equipment such as a compressor.

  In addition, it is possible to avoid the problem of not operating with the air volume set by the user at the start of operation, and to operate the air conditioner without sacrificing comfort while protecting equipment such as a compressor.

  Moreover, the time for adjusting the refrigerant flow rate can be shortened, and the comfort is further improved, and the air conditioner can be operated without sacrificing the comfort while protecting the equipment such as the compressor.

  Further, it is not necessary to communicate with the outdoor side, and the suction pressure sensor is not necessary, thereby reducing the cost.

  According to a first aspect of the present invention, a plurality of outdoor units having a variable capacity compressor, an outdoor heat exchanger, a blower, a refrigerant liquid pipe, and a refrigerant gas pipe, and a plurality of indoor units having a heat exchanger and a blower are connected. An electric refrigerant expansion valve is interposed between the refrigerant liquid pipe and the indoor heat exchanger to form a refrigeration cycle. When one indoor unit starts cooling or dehumidifying operation, the other indoor unit is operated by cooling or dehumidifying In the case of the inside, a control device for gradually opening the expansion valve from the closed state is provided.

By adopting this configuration, it is possible to avoid a sudden increase in evaporation pressure due to a sudden increase in indoor heat exchange capacity, avoid a compressor breakdown due to an increase in compressor suction pressure, and improve equipment reliability and compressor reliability. To do.

  According to a second aspect of the present invention, a plurality of outdoor units having a variable capacity compressor, an outdoor heat exchanger, a blower, a refrigerant liquid pipe, and a refrigerant gas pipe, and a plurality of indoor units having a heat exchanger and a blower are connected. An refrigeration cycle with an electric refrigerant expansion valve interposed between the heat exchanger and the indoor heat exchanger, and a suction pressure detection device is provided at least in the refrigerant suction pipe of the outdoor unit. In the air conditioner provided with a control device that controls the air volume of the blower according to the signal of the detection device and the operation status of the other room, when one indoor unit starts cooling or dehumidifying operation, the other indoor unit is operating by cooling or dehumidifying In this case, when the value of the suction pressure detection device is higher than a predetermined pressure value, the indoor fan is operated at a minimum air volume for a predetermined time or is stopped.

  With this configuration, it is possible to operate an air conditioner that protects equipment such as a compressor and does not impair comfort.

  According to a third aspect of the present invention, at the start of cooling or dehumidifying operation, if the value of the suction pressure detection device is higher than the first predetermined pressure value, is the indoor fan operated at the minimum air volume until it falls below the second predetermined pressure return value? Or stop.

  With this configuration, it is possible to operate an air conditioner that protects equipment such as a compressor and does not impair comfort.

  The fourth invention provides a suction pressure detection device at least in the refrigerant suction pipe of the outdoor unit, when one indoor unit is started at the start of cooling or dehumidifying operation, and when the other indoor unit is operating by cooling or dehumidifying, When the value of the suction pressure detection device is higher than a predetermined pressure value, the expansion valve is operated with the valve slightly opened or closed for a predetermined time.

  With this configuration, it is possible to operate an air conditioner that protects equipment such as a compressor and does not impair comfort.

  According to a fifth aspect of the present invention, when the value of the suction pressure detecting device is higher than a predetermined pressure value at the start of cooling or dehumidifying operation, the expansion valve is operated with being slightly opened or closed until it falls below a set pressure return value.

  With this configuration, it is possible to operate an air conditioner that protects equipment such as a compressor and does not impair comfort.

  According to a sixth aspect of the present invention, there is provided another indoor heat exchanger temperature detection device that detects the temperature of the heat exchanger, and when one indoor unit starts cooling or dehumidifying operation, the value of the other indoor heat exchanger temperature detection device is predetermined. When the temperature is higher than the temperature value, the indoor blower is operated at the minimum air volume or stopped until the temperature falls below a predetermined temperature return value.

  With this configuration, it is possible to operate an air conditioner that protects equipment such as a compressor and does not impair comfort.

According to a seventh aspect of the present invention, a plurality of outdoor units having a variable capacity compressor, an outdoor heat exchanger, a blower, a refrigerant liquid pipe, and a refrigerant gas pipe, and a plurality of indoor units having a heat exchanger and a blower are connected. An indoor refrigerant chamber is provided between the refrigerant liquid pipe and the indoor heat exchanger to constitute a refrigeration cycle, and one indoor unit detects the temperature of the heat exchanger of another indoor unit. When a heat exchanger temperature detection device is installed and the other room is operating in the cooling or dehumidification operation when cooling or dehumidifying operation is started, if the value of the other-room indoor heat exchanger temperature detection device is higher than the predetermined temperature value, the predetermined temperature is restored. The expansion valve is operated slightly opened or closed until it falls below the value.

  With this configuration, it is possible to operate an air conditioner that protects equipment such as a compressor and does not impair comfort.

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

(Embodiment 1)
FIG. 1 is an example of a refrigeration cycle diagram of a multi-room air conditioner according to the present invention, and shows a case where a plurality of (for example, two) indoor units 10a and 10b are connected to one outdoor unit 1. .
In FIG. 1, an outdoor unit 1 includes an inverter-driven capacity (frequency) variable compressor 2 (hereinafter simply referred to as a compressor), an outdoor heat exchanger 3, an outdoor blower 4, a refrigerant liquid side main pipe 5, and a refrigerant. A gas side main pipe 6 and a four-way valve 7 for switching between heating and cooling are provided.

  On the other hand, the indoor units 10a and 10b are provided with indoor fans 12a and 12b and indoor heat exchangers 11a and 11b, respectively. The outdoor unit 1 and the indoor units 10a and 10b are branched from the refrigerant liquid side main pipe 5. The branch pipes 17a and 17b and the gas side branch pipes 18a and 18b branched from the refrigerant gas side main pipe 6 are connected. Between the liquid side branch pipes 17a and 17b and the indoor heat exchangers 11a and 11b, for example, Electric expansion valves 13a and 13b capable of pulse-controlling the valve opening by a stepping motor or the like are interposed.

  The indoor units 10a and 10b include indoor suction temperature detectors 14a and 14b that detect the room temperature of the room, and indoor heat exchanger temperature detectors 15a and 15b that detect the temperature of the heat exchanger of the indoor units 10a and 10b. Are provided with operation setting devices 16a and 16b that can set the operation mode (cooling or heating), room temperature, and operation or stop desired.

  The suction pipe 8 of the compressor 2 of the outdoor unit 1 is provided with a suction pressure detection device 9 that detects the suction pressure.

  In the refrigeration cycle configured as described above, during cooling or dehumidifying operation, the refrigerant discharged from the compressor 2 flows to the outdoor heat exchanger 3 through the four-way valve 7, and the outdoor heat exchanger 3 drives the outdoor heat exchanger 3 to drive the outdoor heat exchanger 3. Heat is exchanged with air to condense and liquefy, and then flow through the refrigerant liquid main pipe 5 to distribute the refrigerant in the liquid side branch pipes 17a and 17b, and control the flow rate of the refrigerant distributed to the plurality of indoor units by the electric expansion valves 13a and 13b. Then, after evaporating in the indoor heat exchangers 11a and 11b, it joins from the gas side branch to the refrigerant gas side main pipe 6 and is sucked into the compressor 2 again through the four-way valve 7.

  Since the electric expansion valves 13a and 13b are pulse-controlled by a stepping motor or the like so as to have an opening corresponding to the indoor load, the refrigerant is also controlled at a flow rate corresponding to the indoor load.

  Next, the control flow of the present invention will be described with reference to FIGS.

  FIG. 2 is a block diagram showing a flow of controlling a compressor frequency and an electric expansion valve by transmitting a differential temperature and an indoor load level signal from a relationship between temperature and operation setting from a plurality of indoor units, and FIG. 3 is a flowchart diagram. is there.

First, the flow of each signal will be described with reference to FIG. 2. In the indoor unit 10a, the output of the indoor suction temperature detecting device 14a is sent to the differential temperature calculating device 17a, while the signal from the operation setting device 16a is received by the signal receiving device 18a. The temperature setting set by the operation setting device 16a is stored in the indoor temperature setting storage device 19a, and the temperature setting is sent to the differential temperature calculation device 17a, where the differential temperature ΔT (= Tr−Ts) is calculated, The temperature signal.

  In the operation setting device 16a, in addition to temperature setting, an operation stop signal, operation modes such as cooling / dehumidification / heating, etc., air volume setting, air volume automatic, air direction setting, and wind direction automatic can be set.

Further, the operation stop storage device 20a receives the signal set by the operation setting device 16a by the signal receiving device 18a and stores the operation (ON) or stop (OFF) of the indoor unit 10a. Also, the air volume setting storage device 21a Then, the signal set by the operation setting device 16a is received by the signal receiving device 18, and the set air volume of the indoor unit is stored.

  Moreover, the output of the indoor heat exchanger temperature detection device 15a is output as a signal of the indoor heat exchanger temperature. In the operation mode storage device 22a, the signal set by the operation setting device 16a is received by the signal receiving device 18a, and any operation mode such as cooling, dehumidification, and heating of the indoor unit 10a is stored.

  Then, a differential temperature signal, an operation mode signal, an operation stop signal, a set air volume signal, and a heat exchanger temperature signal are sent from a signal sending device to a 25 blower air volume setting device 23a, an expansion valve opening setting device 24a, and a signal receiving device for the outdoor unit 1. 26.

  Further, the operation mode signal, the operation stop signal, and the indoor heat exchanger temperature signal are sent to the other indoor unit 10b and stored in the other room operation mode storage device 27b so that each indoor unit can grasp the operation status of each other indoor unit. It has become.

  In the indoor units 10a and 10b, a predetermined calculation is performed from the valve initial opening degree table 28a by the expansion valve opening degree setting device 24a based on the differential temperature signal, the operation mode signal, the operation stop signal, the indoor heat exchanger temperature signal, and the set air volume signal. Is performed to determine the opening degree of the electric expansion valve 13a, the indoor air volume is determined by the air volume setting device 23a, and the indoor unit is operated.

  On the other hand, in the outdoor unit 1, the operation frequency based on the differential temperature signal, the operation mode signal, the operation stop signal, the set air volume signal, and the heat exchanger temperature signal received from the indoor units 10 a and 10 b by the compressor frequency calculation device 28. After the compressor frequency is set, the compressor frequency is controlled.

  Thereafter, the valve opening degree of the electric expansion valve 13a and the frequency of the compressor 2 are calculated based on the differential temperature signal, the operation mode signal, the operation stop signal, the set air volume signal, and the indoor heat exchanger temperature signal at predetermined intervals. Control is performed.

  Here, on the indoor side, the valve initial opening degree table 28a is set in the expansion valve opening degree setting device 24a based on the differential temperature signal, the operation mode signal, the operation stop signal, the set air volume signal, and the indoor heat exchanger temperature signal at the same time as the operation is started. The opening of the electric expansion valve 13a is determined by performing a predetermined calculation from the above, the indoor air volume is determined by the air volume setting device 23a, and the indoor unit is operated. However, the outdoor side is operated every predetermined period (control interval time). Because the frequency of the compressor 2 is calculated and controlled based on the differential temperature signal, the operation mode signal, the operation stop signal, the set air volume signal and the indoor heat exchanger temperature signal sent from the indoor side, the time difference between the indoor and outdoor This causes a time lag until the compressor frequency rises by a predetermined period (control interval time) at the maximum after the indoor side starts to move.

Next, the flow of control of the present invention will be specifically described with reference to the flowchart of FIG. When the resident selects cooling or dehumidification with the operation setting device 16a (for example, room a) (STEP 0), the indoor air volume and the heat exchanger temperature signal are changed based on the differential temperature signal, the operation mode signal, the operation stop signal, the set air volume signal, and the heat exchanger temperature signal. The expansion valve initial opening Pex (in this case, for example, Pex0 pulse) (STEP 2) is set, and simultaneously with the operation selection, the operation is started at the set indoor air volume and the expansion valve initial opening and the signal is received from the outdoor unit 1 through the signal sending device 25a. When the indoor unit determines that the other room (for example, room b) is in cooling or dehumidifying operation (STEP 1), it is not an expansion valve initial opening (for example, Pex0 pulse in this case) but an O pulse (closed). ) To (STEP 3) every predetermined time (Tint) (STEP 6) gradually Pexa pulse (STEP 4) until the initial setting pulse Pex0 is reached (STEP 5) Control it like this. The time to reach the initial setting pulse Pex0 is given the same time that is slightly larger than the control interval of the compressor frequency arithmetic unit 28 on the outdoor side, and the refrigerant that has been in the load on the indoor unit after the frequency of the compressor 2 has increased. Is controlled to be supplied.

  And according to this configuration, before the compressor frequency rises, it is possible to avoid a sudden rise in evaporation pressure due to a sudden increase in indoor heat exchange capacity, avoid a compressor breakdown due to a rise in compressor suction pressure, and improve the reliability of equipment and The reliability of the compressor is improved.

Therefore, it is possible to operate the air conditioner effectively while protecting the equipment such as the compressor and without impairing the comfort. Note that the heating operation is not the main point of the present invention, and the description thereof is omitted.

(Embodiment 2)
1 is an example of a refrigeration cycle diagram of an air-conditioning apparatus according to Embodiment 2 of the present invention, FIG. 2 is a control block diagram, and FIG. 4 is a flowchart.

Since the movement of the refrigeration cycle and the flow of each signal are the same as those in the first embodiment, the description thereof is omitted.
Next, the flow of control of the present invention will be specifically described with reference to the flowchart of FIG.

  When the resident selects cooling or dehumidification with the operation setting device 16a (for example, room a) (STEP 0), the indoor air volume and the heat exchanger temperature signal are changed based on the differential temperature signal, the operation mode signal, the operation stop signal, the set air volume signal, and the heat exchanger temperature signal. The expansion valve initial opening Pex (for example, Pex0 pulse in this case) is set, and the operation is started at the set indoor air volume and the expansion valve initial opening simultaneously with the operation selection, and to the signal receiving device 26 of the outdoor unit 1 through the signal sending device 25a. When the indoor unit determines that the other room (for example, room b) is in cooling or dehumidifying operation (STEP 1), or when the value (LPs) of the suction pressure detection device 9 is greater than a certain set value LPa (STEP 2) ), A predetermined time (Titv) (STEP 4) from the start of operation, so that the air volume of the indoor unit is operated not with the set air volume but with the minimum air volume (or air blowing stop). Control is carried out (STEP3).

  This predetermined time (Titv) is given the same time that is slightly larger than the control interval of the compressor frequency calculation device 28 of the outdoor unit 1, so that after the frequency of the compressor 2 increases, It is controlled so that heat exchange that matches the load is performed (almost no heat is exchanged due to a slight air flow or stoppage).

  And according to this configuration, before the compressor frequency rises, it is possible to avoid a sudden rise in evaporation pressure due to a sudden increase in indoor heat exchange capacity, avoid a compressor breakdown due to a rise in compressor suction pressure, and improve the reliability of equipment and The reliability of the compressor is improved.

  Therefore, it is possible to operate the air conditioner effectively while protecting equipment such as the compressor and without impairing comfort.

(Embodiment 3)
FIG. 1 is an example of a refrigeration cycle diagram of an air-conditioning apparatus according to Embodiment 2 of the present invention.
FIG. 2 is a control block diagram, and FIG. 5 is a flowchart.

  Since the movement of the refrigeration cycle and the flow of each signal are the same as those in the first embodiment, the description thereof is omitted.

  Next, the flow of control of the present invention will be specifically described with reference to the flowchart of FIG. When the resident selects cooling or dehumidification with the operation setting device 16a (for example, room a) (STEP 0), the indoor air volume and the heat exchanger temperature signal are changed based on the differential temperature signal, the operation mode signal, the operation stop signal, the set air volume signal, and the heat exchanger temperature signal. The expansion valve initial opening degree Pex (here, for example, Pex0 pulse) is set, the operation is started at the set indoor air volume and the expansion valve initial opening degree simultaneously with the selection of the operation, and the signal receiving device 26 of the outdoor unit 1 is passed through the signal sending device 25a. When the indoor unit determines that the other room (for example, room b) is in cooling or dehumidifying operation (STEP 1), or when the value (LPs) of the suction pressure detection device 9 is greater than a certain set value LPa (STEP 2) ), A predetermined time from the start of operation (Titv) (STEP 6) The air volume of the indoor unit is not the set air volume but the minimum air volume (or the air supply is stopped). When the control is performed (STEP 3) and the value (LPs) of the suction pressure detection device 9 falls below a set value LPb (here, LPb = LPa-1 kg / cm 2 G is set) (STEP 4), the compressor 2 has a frequency It is determined that the up is started, and the operation is controlled so that the operation is started with the set air volume (STEP 5).

  And according to this configuration, before the compressor frequency rises, it is possible to avoid a sudden rise in evaporation pressure due to a sudden increase in indoor heat exchange capacity, avoid a compressor breakdown due to a rise in compressor suction pressure, and improve the reliability of equipment and The reliability of the compressor is improved. Further, since the operation is started with the indoor set air volume at the same time when the compressor frequency is increased, the comfort is remarkably improved. Therefore, it is possible to operate the air conditioner effectively while protecting equipment such as the compressor and without impairing comfort.

(Embodiment 4)
1 is an example of a refrigeration cycle diagram of an air-conditioning apparatus according to Embodiment 4 of the present invention, FIG. 2 is a control block diagram, and FIG. 6 is a flowchart. Since the operation of the refrigeration cycle and the flow of each signal are the same as in the first embodiment, description thereof is omitted.

  Next, the flow of control of the present invention will be specifically described with reference to the flowchart of FIG. When the resident selects cooling or dehumidification with the operation setting device 16a (for example, room a) (STEP 0), the indoor air volume and the heat exchanger temperature signal are changed based on the differential temperature signal, the operation mode signal, the operation stop signal, the set air volume signal, and the heat exchanger temperature signal. The expansion valve initial opening degree Pex (here, for example, Pex0 pulse) is set, the operation is started at the set indoor air volume and the expansion valve initial opening degree simultaneously with the selection of the operation, and the signal receiving device 26 of the outdoor unit 1 is passed through the signal sending device 25a. When the indoor unit determines that the other room (for example, room b) is in cooling or dehumidifying operation (STEP 1), or when the value (LPs) of the suction pressure detection device 9 is greater than a certain set value LPa (STEP 2) ), A predetermined time (Titv) (STEP 6) from the start of operation, and the initial opening degree of the expansion valve having a value (LPs) of the suction pressure detection device 9 (here, for example, Pex0 Control is performed so that the operation is performed with a predetermined fine opening pulse Pexmin (or with the valve fully closed) (STEP 3). Since this predetermined time (Titv) is given the same time slightly larger than the control interval of the compressor frequency calculation device 28 in the outdoor side 1, the frequency of the compressor 2 is increased before the load on the indoor unit is increased. It is controlled to supply the appropriate refrigerant. And according to this configuration, before the compressor frequency rises, it is possible to avoid a sudden rise in evaporation pressure due to a sudden increase in indoor heat exchange capacity, avoid a compressor breakdown due to a rise in compressor suction pressure, and improve the reliability of equipment and The reliability of the compressor is improved. Therefore, it is possible to operate the air conditioner effectively while protecting equipment such as the compressor and without impairing comfort.

(Embodiment 5)
1 is an example of a refrigeration cycle diagram of an air-conditioning apparatus according to Embodiment 5 of the present invention, FIG. 2 is a control block diagram, and FIG. 7 is a flowchart.
Since the operation of the refrigeration cycle and the flow of each signal are the same as in the first embodiment, description thereof is omitted.
Next, the flow of control of the present invention will be specifically described with reference to the flowchart of FIG. When the resident selects cooling or dehumidification with the operation setting device 16a (for example, room a) (STEP 0), the indoor air volume and the heat exchanger temperature signal are changed based on the differential temperature signal, the operation mode signal, the operation stop signal, the set air volume signal, and the heat exchanger temperature signal. The expansion valve initial opening degree Pex (here, for example, Pex0 pulse) is set, the operation is started at the set indoor air volume and the expansion valve initial opening degree simultaneously with the selection of the operation, and the signal receiving device 26 of the outdoor unit 1 is passed through the signal sending device 25a. When the indoor unit determines that the other room (for example, room b) is in cooling or dehumidifying operation (STEP 1), or when the value (LPs) of the suction pressure detection device 9 is greater than a certain set value LPa (STEP 2) ), A predetermined time (Titv) (STEP 6) from the start of operation, and the initial opening degree of the expansion valve having a value (LPs) of the suction pressure detection device 9 (here, for example, Pex0 It is controlled to operate with a predetermined fine opening pulse Pexmin (or fully closed) instead of (Lus) (STEP 3), but the value (LPs) of the suction pressure detection device 9 has a set value LPb (here, If it falls below (LPb = LPa-1kg / cm2G) (STEP 4), it is determined that the compressor 2 has started to increase the frequency, and the operation is started at the expansion valve initial opening Pex (here, for example, Pex0 pulse). (STEP 5). Therefore, control is performed so that the refrigerant suitable for the load of the indoor unit is supplied after the frequency of the compressor 2 increases.

  And according to this configuration, before the compressor frequency rises, it is possible to avoid a sudden rise in evaporation pressure due to a sudden increase in indoor heat exchange capacity, avoid a compressor breakdown due to a rise in compressor suction pressure, and improve the reliability of equipment and The reliability of the compressor is improved.

Also, since the refrigerant is supplied indoors at the same time as the compressor frequency rises, the comfort is significantly improved (without waiting for the control interval time, the refrigerant can be supplied quickly and cool air can be sent into the room as the frequency increases). Therefore, it is possible to operate the air conditioner effectively while protecting the equipment such as the compressor and without impairing comfort (Embodiment 6).
1 is an example of a refrigeration cycle diagram of an air-conditioning apparatus according to Embodiment 6 of the present invention, FIG. 2 is a control block diagram, and FIG. 8 is a flowchart diagram. Since the operation of the refrigeration cycle and the flow of each signal are the same as in the first embodiment, description thereof is omitted.

  Next, the flow of control of the present invention will be specifically described with reference to the flowchart of FIG. When the resident selects cooling or dehumidification with the operation setting device 16a (for example, room a) (STEP 0), the indoor air volume and the heat exchanger temperature signal are changed based on the differential temperature signal, the operation mode signal, the operation stop signal, the set air volume signal, and the heat exchanger temperature signal. The expansion valve initial opening degree Pex (here, for example, Pex0 pulse) is set, the operation is started at the set indoor air volume and the expansion valve initial opening degree simultaneously with the selection of the operation, and the signal receiving device 26 of the outdoor unit 1 is passed through the signal sending device 25a. When the indoor unit determines that the other room (for example, room b) is in cooling or dehumidifying operation (STEP 1), the heat exchanger temperature (Tevab) of the other room is larger than a set value Tev1 (STEP 2). ), A certain time from the start of operation (Titv) (STEP 6) The air flow of the indoor unit is not the set air volume, but the minimum air volume (or air blowing is stopped). (STEP 3), when the temperature of the heat exchanger (Tevab) in the other chamber falls below a certain set value Tev2 (here, for example, Tev2 = Tev1-2 ° C.) (STEP 4), the compressor 2 is determined to start the frequency increase, and the operation is controlled so as to start the operation with the set air volume (STEP 5).

And according to this configuration, before the compressor frequency rises, it is possible to avoid a sudden rise in evaporation pressure due to a sudden increase in indoor heat exchange capacity, avoid a compressor breakdown due to a rise in compressor suction pressure, and improve the reliability of equipment and The reliability of the compressor is improved. Further, since the operation is started with the indoor set air volume at the same time when the compressor frequency is increased, the comfort is remarkably improved. Therefore, it is possible to operate the air conditioner effectively while protecting equipment such as the compressor and without impairing comfort.

(Embodiment 7)
1 is an example of a refrigeration cycle diagram of an air-conditioning apparatus according to Embodiment 7 of the present invention, FIG. 2 is a control block diagram, and FIG. 9 is a flowchart. Since the movement of the refrigeration cycle and the flow of each signal are the same as those in the first embodiment, the description thereof is omitted.

  Next, the flow of control of the present invention will be specifically described with reference to the flowchart of FIG. When the resident selects cooling or dehumidification with the operation setting device 16a (for example, room a) (STEP 0), the indoor air volume and the heat exchanger temperature signal are changed based on the differential temperature signal, the operation mode signal, the operation stop signal, the set air volume signal, and the heat exchanger temperature signal. The expansion valve initial opening degree Pex (here, for example, Pex0 pulse) is set, the operation is started at the set indoor air volume and the expansion valve initial opening degree simultaneously with the selection of the operation, and the signal receiving device 26 of the outdoor unit 1 is passed through the signal sending device 25a. When the indoor unit determines that the other room (for example, room b) is in cooling or dehumidifying operation (STEP 1), the heat exchanger temperature (Tevab) of the other room is larger than a set value Tev1 (STEP 2). ), A predetermined time (Titv) (STEP 6) from the start of operation, not a certain initial opening of the expansion valve (here, for example, Pex0 pulse), but a predetermined slight opening Although it is controlled so that the operation is performed with the pulse Pexmin (or in a fully closed state) (STEP 3), the heat exchanger temperature (Tevab) of the other chamber has a certain set value Tev2 (here, for example, Tev2 = Tev1-2 ° C.) (STEP 4), it is determined that the compressor 2 has started to increase the frequency, and the operation is started (STEP 5) so that the operation is started at the expansion valve initial opening Pex (in this case, for example, Pex0 pulse). Yes. Therefore, control is performed so that the refrigerant suitable for the load of the indoor unit is supplied after the frequency of the compressor 2 increases.

  And according to this configuration, before the compressor frequency rises, it is possible to avoid a sudden rise in evaporation pressure due to a sudden increase in indoor heat exchange capacity, avoid a compressor breakdown due to a rise in compressor suction pressure, and improve the reliability of equipment and The reliability of the compressor is improved.

  Also, since the refrigerant is supplied into the room at the same time as the compressor frequency is increased, the comfort is remarkably improved (without waiting for the control interval time, the refrigerant is supplied quickly and cool air is supplied to the room as the frequency increases). Can be sent in).

  Therefore, it is possible to operate the air conditioner effectively while protecting equipment such as the compressor and without impairing comfort.

  As described above, the air conditioner according to the present invention can avoid a sudden increase in evaporation pressure due to a sudden increase in indoor heat exchange capacity, can avoid a compressor breakdown due to an increase in compressor suction pressure, Since the reliability of the compressor is improved, the present invention can be applied not only to the multi-chamber type air conditioner but also to a case where the air volume is rapidly changed in the single-chamber type air conditioner.

Refrigeration cycle diagram of the present invention Control block diagram of the present invention Flowchart of the first embodiment of the present invention Flowchart of the second embodiment of the present invention Flowchart of the third embodiment of the present invention Flowchart of the fourth embodiment of the present invention Flowchart of the fifth embodiment of the present invention Flowchart of the sixth embodiment of the present invention Flowchart of the seventh embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Compressor 3 Outdoor heat exchanger 4 Outdoor blower 5 Refrigerant liquid pipe 6 Refrigerant gas pipe 7 Four-way valve 8 Refrigerant suction pipe 9 Suction pressure detection apparatus 10 Indoor unit 11 Indoor heat exchanger 12 Indoor blower 13 Electric expansion valve 14 Indoor suction temperature detection device 15 Indoor heat exchanger temperature detection device 16 Operation setting device

Claims (7)

A plurality of outdoor units having a variable capacity compressor, an outdoor heat exchanger, a blower, a refrigerant liquid pipe, a refrigerant gas pipe, and an indoor unit having a heat exchanger and a blower are connected, and the refrigerant liquid pipe of the indoor unit and the An electric refrigerant expansion valve is interposed between the indoor heat exchangers to form a refrigeration cycle.When one indoor unit starts cooling or dehumidifying operation and the other indoor unit is operating by cooling or dehumidifying, the expansion An air conditioning apparatus comprising a control device that gradually opens a valve from a closed state. A plurality of outdoor units having a variable capacity compressor, an outdoor heat exchanger, a blower, a refrigerant liquid pipe, a refrigerant gas pipe, and an indoor unit having a heat exchanger and a blower are connected, and the refrigerant liquid pipe and the indoor heat exchanger are connected. An refrigeration cycle is configured by interposing an electric refrigerant expansion valve between them, and at least a suction pressure detection device is provided in the refrigerant suction pipe of the outdoor unit, and when the cooling or dehumidifying operation starts, the signal of the suction pressure detection device and others In the air conditioner provided with a control device for controlling the air volume of the blower according to the room operation status, when one indoor unit is in cooling or dehumidifying operation and the other indoor unit is operating in cooling or dehumidifying, the suction pressure detection When the value of the apparatus is higher than a predetermined pressure value, the air conditioner is characterized in that the indoor blower is operated at a minimum air volume for a predetermined time or stopped. At the start of cooling or dehumidifying operation, if the value of the suction pressure detection device is higher than the first predetermined pressure value, the indoor blower is operated at the minimum air volume until it falls below the second predetermined pressure return value, or is stopped. The air conditioner according to claim 2, wherein the air conditioner is characterized. If the suction pressure detection device is provided at least in the refrigerant suction pipe of the outdoor unit and one indoor unit is started at the start of cooling or dehumidifying operation, and the other indoor unit is operating in cooling or dehumidifying operation, the value of the suction pressure detecting device 3. The air conditioner according to claim 2, wherein when the pressure is higher than a predetermined pressure value, the expansion valve is operated for a predetermined time by slightly opening or closing. 5. When the cooling or dehumidifying operation is started, if the value of the suction pressure detection device is higher than a predetermined pressure value, the expansion valve is operated by being slightly opened or closed until it falls below a set pressure return value. The air conditioning apparatus described in 1. When another indoor heat exchanger temperature detection device that detects the temperature of the heat exchanger is provided and one indoor unit starts cooling or dehumidifying operation, when the value of the other indoor heat exchanger temperature detection device is higher than a predetermined temperature value, The air conditioner according to claim 3, wherein the indoor blower is operated with a minimum air volume or stopped until the temperature falls below a predetermined temperature return value. A plurality of outdoor units having a variable capacity compressor, an outdoor heat exchanger, a blower, a refrigerant liquid pipe, a refrigerant gas pipe, and an indoor unit having a heat exchanger and a blower are connected, and the refrigerant liquid pipe of the indoor unit and the Another room indoor heat exchanger temperature detection device that configures a refrigeration cycle by interposing an electric refrigerant expansion valve between indoor heat exchangers, and detects the temperature of the heat exchanger of the other indoor unit in one indoor unit When the other chamber is operating with cooling or dehumidification at the start of cooling or dehumidifying operation, if the value of the other-room indoor heat exchanger temperature detection device is higher than a predetermined temperature value, the expansion valve until it falls below the predetermined temperature return value Is an air conditioner that is operated by being slightly opened or closed.

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