JP2003254590A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner which improves comfort and saves on energy by responding to change of a form of an indoor machine and a heat exchanger specification and exerting the optimum capacity according to a required capacity inside a room. <P>SOLUTION: The indoor machine is provided with a temperature difference calculating means 22 for calculating a temperature difference between a set temperature and a detected temperature, a rated capacity memorizing means 25 for memorizing a rated capacity of the indoor machine, an ON/OFF determining means 24 of the indoor machine, and a heat exchanger capacity set value memorizing means 36, while an outdoor machine is provided with a compressor capacity control means 28 for controlling the capacity of a variable displacement compressor by a predetermined cycle using data obtained from the temperature difference calculating means 22, the rated capacity memorizing means 25 and the ON/OFF determining means 24, and an equation of a compressor displacement is derived based on a set value of an indoor heat exchanger capacity memorized in the heat exchanger capacity set value memorizing means 36 for controlling the compressor displacement. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner in which at least one indoor unit is connected to one outdoor unit and the capacity is controlled by the compressor operating frequency.

[0002]

2. Description of the Related Art Conventionally, a multi-room air conditioner has been proposed in which a variable capacity compressor is used and the compressor capacity of an outdoor unit is variably controlled according to a load demanded from the indoor unit.

An example of a multi-room air conditioner in which a plurality of indoor units are connected to one outdoor unit will be described below (for example, Japanese Unexamined Patent Publication No. Hei 4 (1999) -96945).
No. 42524), a conventional multi-room air conditioner will be described with reference to the drawings.

FIG. 9 shows a refrigeration cycle of a conventional multi-room air conditioner. In the outdoor unit 101, an inverter-driven variable frequency compressor 103 (hereinafter simply referred to as a compressor) and an outdoor unit are provided. A heat exchanger 104 and a four-way valve 105 for switching between heating and cooling are provided, while indoor units 102a, 102b,
The indoor heat exchangers 106a, 10a,
6b and 106c are provided. The outdoor unit 101 and the indoor units 102a, 102b, and 102c are branched from a liquid-side main pipe 107 provided in the outdoor unit 101.
08a, 108b, 108c and gas side branch pipes 110a, 110b, 110c branched from the gas side main pipe 109 provided in the outdoor unit 101.

Liquid side branch pipes 108a, 108b, 1
Reference numerals 08c denote electric expansion valves 111a and 111b whose pulse opening can be pulse-controlled by using stepping motors.
111c is interposed.

Furthermore, the indoor units 102a, 102b, 1
02c is an indoor temperature sensor 1 for detecting the room temperature of the room in which the indoor units 102a, 102b, 102c are installed.
17a, 117b, 117c, and operation setting circuits 118a, 118b, 118c capable of setting the operation mode (cooling or heating) desired by the occupant, room temperature, and operation / stop.

A method of controlling the compressor frequency in this refrigeration cycle will be described. 10 is a block diagram showing the flow of compressor frequency control, and FIG. 3 is a temperature zone division diagram of the temperature difference ΔT between the room temperature Tr and the set temperature Ts.

First, in the indoor unit 102a, the output of the indoor temperature sensor 117a is sent from the indoor temperature detecting circuit 121 to the differential temperature calculating circuit 122 as a temperature signal, and
The setting determination circuit 123 determines the set temperature and the operation mode set by the operation setting circuit 118a and sends them to the differential temperature calculation circuit 122. The temperature difference calculation circuit 122 calculates the temperature difference ΔT (= Tr−Ts) and converts it into the load number Ln value shown in FIG. 3 to use as the temperature difference signal.

For example, Tr = 27.3 ° C. during cooling operation,
If Ts = 26 ° C., the temperature difference ΔT = 1.3 ° C., Ln =
It becomes 6.

Further, in the ON-OFF discrimination circuit 124,
The operation (ON) or stop (OFF) of the indoor unit 102a set by the operation setting circuit 118a is determined, and the rated capacity of the indoor unit 102a is stored in the rated capacity storage circuit 125. The differential temperature signal, the operation mode signal, and the ON-OFF determination signal are sent from the signal sending circuit 126 to the signal receiving circuit 127 of the outdoor unit 101. Indoor unit 1
Similar signals from 02b and 102c are also received by the signal receiving circuit 12.
Sent to 7. The signal received by the signal receiving circuit 127 is sent to the compressor frequency arithmetic circuit 128.

In the compressor frequency calculation circuit 128, the load constant table 130 shown in Table 1 is used to load the load from the rated capacity signal, the differential temperature signal, the operation mode signal, and the ON-OFF discrimination signal of each of the indoor units 102a, 102b, 102c The constant is read and the sum of the load constants is multiplied by the constant to determine the frequency of the compressor 103.

[Table 1]

In this way, the compressor frequency is controlled according to the total required capacity of each room.

[0013]

However, the conventional air conditioner having the above structure has the following problems. Since the load constant is read using the load constant table 130 according to the required load from the indoor units 102a, 102b, 102c, in order to perform optimum compressor control, not only the rated capacity of the indoor unit but also each type A load constant table is required, and the number of data will become enormous as the number of indoor models increases.

Further, since it is necessary to previously provide the outdoor unit 101 with the load constant table 130, it becomes difficult to perform optimum compressor control when a connected indoor model is newly added.

The present invention has been made in view of the above problems of the prior art.
It is an object of the present invention to provide an air conditioner capable of improving comfort and energy saving by responding to changes in heat exchanger specifications and exhibiting optimum capacity according to indoor required capacity.

[0016]

In order to achieve the above-mentioned object, the present invention provides one outdoor unit having a variable capacity compressor and an outdoor heat exchanger, and a plurality of indoor units having an indoor heat exchanger. A multi-room type air conditioner in which an indoor unit is installed in each of the plurality of indoor units, and an indoor temperature setting means for arbitrarily setting the temperature of the room in which the indoor unit is installed, and the indoor temperature are detected. The indoor temperature detecting means, the temperature difference calculating means for calculating the temperature difference between the temperature set by the indoor temperature setting means and the indoor temperature detected by the indoor temperature detecting means, and the rated capacity of the indoor unit are stored. Provided are a rated capacity storage means, an ON / FF determination means for determining whether each indoor unit is in operation or a stop, and a heat exchanger capacity set value storage means for storing an indoor heat exchanger capacity set value of the indoor unit. On the other hand, in the outdoor unit,
The differential temperature calculation means, the rated capacity storage means, and the ON
A compressor capacity control means is provided for controlling the capacity of the variable capacity compressor at predetermined intervals using the data obtained from the ON / OFF discrimination means, and the compressor capacity control means stores the heat exchanger capacity set value storage. It is characterized in that an arithmetic expression of the compressor capacity is derived based on the indoor heat exchanger capacity set value stored in the means to control the compressor capacity.

Further, in place of the heat exchanger capacity set value storage means, a shape correction is performed in which a value of a capacity ratio between the heat exchanger capacity value of the indoor unit and a reference heat exchanger capacity value is stored as a shape correction value. Value storage means may be provided, and the compressor capacity control means may control the compressor capacity by deriving an arithmetic expression of the compressor capacity based on the shape correction value stored in the shape correction value storage means. .

Further, in addition to the indoor heat exchanger capacity set value stored in the heat exchanger capacity set value storage means, the compressor capacity control means sets a rated capacity coefficient set for each indoor unit rated capacity. It is also possible to derive an arithmetic expression of the compressor capacity based on this and control the compressor capacity.

Further, the compressor capacity control means may control the compressor capacity by changing the arithmetic expression of the compressor capacity according to the number of operating indoor units.

Further, the present invention is an air conditioner in which one outdoor unit having a variable capacity compressor and an outdoor heat exchanger and one indoor unit having an indoor heat exchanger are connected to each other. An indoor temperature setting unit that arbitrarily sets the temperature of the room in which the indoor unit is installed, an indoor temperature detection unit that detects the indoor temperature, a temperature set by the indoor temperature setting unit, and the indoor unit A temperature difference calculating means for calculating a temperature difference between the indoor temperature detected by the temperature detecting means, a rated capacity storing means for storing a rated capacity of the indoor unit, and an ON / ON for determining whether the indoor unit is in operation or stopped. FF discrimination means and heat exchanger capacity set value storage means for storing the indoor heat exchanger capacity set value of the indoor unit are provided, while the outdoor unit has the differential temperature calculation means, the rated capacity storage means and the ON unit. Obtained from the / OFF discrimination means Compressor capacity control means for controlling the capacity of the variable capacity compressor at predetermined intervals by using data is provided, and the compressor capacity control means is the indoor heat stored in the heat exchanger capacity setting value storage means. The compressor capacity is controlled by deriving an arithmetic expression of the compressor capacity based on the exchanger capacity setting value.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. FIG. 1 shows a refrigeration cycle of a multi-room air conditioner according to a first embodiment of the present invention, in which one outdoor unit 1 is connected with three indoor units 2a, 2b, 2c.

As shown in FIG. 1, in the outdoor unit 1,
An inverter-driven variable frequency compressor 3 (hereinafter, simply referred to as a compressor), an outdoor heat exchanger 4, and a four-way valve 5 for switching between heating and cooling are provided, while the indoor units 2a, 2b, and 2c have:
Indoor heat exchangers 6a, 6b, 6c are provided respectively. The outdoor unit 1 and the indoor units 2a, 2b, and 2c are the outdoor unit 1
Liquid-side branch pipe 8 branched from the liquid-side main pipe 7 provided inside
a, 8b, 8c, and gas-side branch pipes 10a, 10b, 10 branched from the gas-side main pipe 9 provided in the outdoor unit 1.
It is connected with c. The liquid side branch pipes 8a, 8b, 8c are respectively provided with electric expansion valves 11a, 11b, 11c capable of pulse-controlled valve opening using a stepping motor, and each indoor unit 2a, 2b, 2c is provided with: Each indoor unit 2a,
Indoor temperature sensors 17a, 17b, 17c that detect the room temperature of the room where 2b and 2c are installed, and operation setting means 18a that can set the operation mode (cooling or heating) desired by the occupant, room temperature, and operation / stop. , 18b, 18c are provided.

Next, a method of controlling the compressor frequency will be described. 2 is a block diagram showing the flow of control of the compressor frequency, and FIG. 3 is a temperature zone division diagram of the temperature difference ΔT between the room temperature Tr and the set temperature Ts.

First, in the indoor unit 2a, the output of the indoor temperature sensor 17a is sent from the indoor temperature detecting means 21 as a temperature signal to the temperature difference calculating means 22, and the indoor temperature setting means 23 sets the operation setting means 18a. The set temperature and the operation mode are discriminated and sent to the temperature difference calculating means 22. In the temperature difference calculating means 22, the temperature difference ΔT (= Tr−Ts)
Is calculated and converted into the load number Ln value shown in FIG. 3, which is used as the temperature difference signal.

For example, Tr = 27.3 during cooling operation.
℃, Ts = 26 ℃, the temperature difference ΔT = 1.3 ℃, L
n = 6.

The ON-OFF discriminating means 24 discriminates the operation (ON) or stop (OFF) of the indoor unit 2a set by the operation setting means 18a, and the rated capacity storage means 25 stores the rated capacity of the indoor unit 2a. In addition, the heat exchanger capacity setting value storage means 36 stores the indoor heat exchanger capacity setting values of the indoor unit 2a, and these heat exchanger capacity setting value signals, rated capacity signals, differential temperature signals, and operation modes are stored. Signal, ON-
The OFF discrimination signal is sent from the signal transmitting means 26 to the signal receiving means 27 of the outdoor unit 1. Similar signals are sent from the indoor units 2b and 2c to the signal receiving means 27. The signal received by the signal receiving means 27 is transmitted to the compressor capacity control means 28 and the operating number recognition means 32.

In the compressor capacity control means 28, the load constant table 30 shown in Table 1 is obtained from the rated capacity signal, the temperature difference signal, the operation mode signal and the ON / OFF discrimination signal of each of the indoor units 2a, 2b and 2c. The load constant is read from the heat exchanger, and the load constant is stored in the heat exchanger capacity setting value storage means 36.
The capacity correction load constant is calculated by dividing it by the indoor heat exchanger capacity setting value stored in the table, and the capacity (operating frequency) of the compressor 3 is determined by multiplying the sum of the capacity correction load constants by the constant. The load constant table 30 includes the rated capacity, the operation mode,
The load constant stored in the load constant storage means 31 provided in each of the indoor units 2a, 2b, and 2c, which is predetermined based on the load number Ln value, is sent from the signal transmission means 26 to the signal reception means 27. Created.

As an example, the number of operating units is 2 (2a, 2).
b, 2c), 2 rooms (2a, 2b), 1 room (2a) when the signals from the indoor units 2a, 2b, 2c during operation are shown in Table 2.

[Table 2]

The operation of all rooms is shown in Table 2 by the indoor units 2a, 2
The load constants of b and 2c are 15, 10 and 19, respectively, the heat exchanger capacity setting values are 2.9, 2.9 and 3.1, and the capacity correction load coefficient Hn is Hn = 15 / 2.9 + 10 / 2.9 + 19 / 3.1 = 1
It becomes 4.7 (the second place after the decimal point is rounded off), and the frequency Hz of the compressor 3 is given by Hz = A × Hn = A × 14.7, where A is a constant.

The result of this calculation is sent as a frequency signal to a compressor drive circuit (not shown) to control the frequency of the compressor 3. After that, the indoor units 2a, 2b, 2c are every predetermined cycle.
Each heat exchanger capacity setpoint signal, rated capacity signal,
Calculation is performed from the differential temperature signal, the operation mode signal, and the ON-OFF determination signal, and the calculation result is sent as a frequency signal to a compressor drive circuit (not shown) to control the frequency of the compressor 3.

In the two-room operation, from Table 2, the indoor units 2a, 2
The load constants of b and 2c are 15, 10 and 0, the heat exchanger capacity setting values are 2.9, 2.9 and 3.1, and the capacity correction load coefficient Hn is Hn = 15 / 2.9 + 10 / 2.9 + 0 / 3.1 = 8.
6 (rounded to the second decimal place), and the frequency Hz of the compressor 3 is given by Hz = A × Hn = A × 8.6, where A is the constant.

In addition, as shown in Table 2, the indoor unit 2
The load constants of a, 2b and 2c are 15, 0 and 0, respectively,
The heat exchanger capacity setting values are 2.9, 2.9 and 3.1,
The capacity correction load coefficient Hn is Hn = 15 / 2.9 + 0 / 2.9 + 0 / 3.1 = 5.2.
(The second decimal place is rounded off), and the frequency Hz of the compressor 3 is Hz = A × Hn = A × 5.2 with the constant A as well.

Although the above description was mainly given for cooling, the same control is possible for heating.

Thus, not only the rated capacity of the room,
Since the compressor frequency is controlled according to the heat exchanger capacity setting value caused by the difference in the indoor unit configuration, it is possible to operate the compressor optimally for the required indoor load. Further, it is possible to control with an extremely small amount of data compared to having data for each different indoor unit form. Therefore, while controlling the refrigeration cycle according to the required load of the indoor unit, finely and optimally,
It is possible to improve comfort and save energy.

Embodiment 2. Next, a multi-room air conditioner according to a second embodiment of the present invention will be described with reference to the drawings. The refrigeration cycle in the second embodiment is the same as that in the first embodiment shown in FIG.

FIG. 4 is a block diagram showing the flow of compressor frequency control in the second embodiment of the present invention.

The block diagram shown in FIG. 4 is different from the block diagram shown in FIG. 2 of the first embodiment in that instead of the heat exchanger capacity set value stored in the connected indoor heat exchanger, the connection value is changed. The capacity ratio between the heat exchanger capacity value of the indoor unit and the reference heat exchanger capacity value is stored as the shape correction value in the shape correction value storage means 37 of the indoor unit, and the shape correction value signal and the rating are stored. Capacity signal, differential temperature signal, operation mode signal, ON-
The OFF discrimination signal is sent from the signal transmitting means 26 to the signal receiving means 27 of the outdoor unit 1.

Similar signals are sent from the indoor units 2b and 2c to the signal receiving means 27. The signal received by the signal receiving means 27 is transmitted to the compressor capacity control means 28.

In the compressor capacity control means 28, the indoor unit 2
a, 2b, 2c rated capacity signal, differential temperature signal,
The load constant is read from the load constant table 30 shown in Table 1 from the operation mode signal and the ON-OFF discrimination signal, and the load constant is divided by the form correction value to calculate the form correction load constant. The frequency of the compressor 3 is determined by multiplying the sum of the above by a constant.

Since the formula for calculating the compressor frequency is the same as that of the first embodiment, its explanation is omitted.

Embodiment 3. Next, a multi-room air conditioner according to a third embodiment of the present invention will be described with reference to the drawings. Since the refrigeration cycle in the third embodiment is the same as that in the first embodiment shown in FIG. 1, the description thereof will be omitted.

FIG. 5 is a block diagram showing the flow of compressor frequency control in the third embodiment of the present invention.

The block diagram shown in FIG. 5 is different from the block diagram shown in FIG. 2 of the first embodiment in that the compressor capacity control means 28 has a differential temperature signal for each of the indoor units 2a, 2b, 2c. The common load constant is read from the common load constant table 38 shown in Table 3 from the operation mode signal and the ON-OFF discrimination signal, and the rated capacity coefficient is obtained from the rated capacity coefficient table 37 shown in Table 4 from each rated capacity signal. The data obtained by multiplying the common load constant and the rated capacity coefficient by reading is divided by the indoor heat exchanger capacity setting value to calculate the capacity correction load constant, and the sum of the capacity correction load constants is multiplied by the constant to calculate the compressor 3 That is, the frequency of is decided.

[Table 3]

[Table 4]

As an example, all operating rooms (2a, 2b,
The case where the signal from 2c) is (a) in Table 2 will be described.

From the table 3 and the table 4, the operation of the indoor unit 2
The common load constants of a, 2b, 2c are 15, 8, 1 respectively.
2, the rated capacity coefficient is 1.00, 1.17,
1.60, the heat exchanger capacity set value is 2.9,
2.9 and 3.1, and the capacity correction load coefficient Hn is Hn = 15 × 1.00 / 2.9 + 8 × 1.17 / 2.9.
+ 12 × 1.60 / 3.1 = 14.6 (rounding to the second decimal place), and the frequency Hz of the compressor 3 is given by: Hz = A × Hn = A × 14.6, where A is a constant. Become.

The result of this calculation is sent as a frequency signal to a compressor drive circuit (not shown) to control the frequency of the compressor 3. After that, the indoor units 2a, 2b, 2c are every predetermined cycle.
Each heat exchanger capacity setpoint signal, rated capacity signal,
Calculation is performed from the differential temperature signal, the operation mode signal, and the ON-OFF determination signal, and the calculation result is sent as a frequency signal to a compressor drive circuit (not shown) to control the frequency of the compressor 3.

Although the above description is mainly made for cooling, the same control can be made for heating.

As described above, since the compressor frequency is controlled based on the rated capacity coefficient read from the rated capacity coefficient table 37 with respect to the rated capacity in the room, the amount of data is extremely small as compared with the case where the load constant table for each rated capacity is provided. It becomes possible to control with. Therefore, it is possible to improve comfort and save energy while finely and optimally controlling the refrigeration cycle according to the required load of the indoor unit.

Fourth Embodiment Next, a multi-room air conditioner according to a fourth embodiment of the present invention will be described with reference to the drawings. The refrigeration cycle in the fourth embodiment is the same as that in the first embodiment shown in FIG.

The block diagram showing the flow of the compressor frequency control in the fourth embodiment is the same as that in the first embodiment shown in FIG. 1, and the compressor capacity control means 28 uses the indoor units 2a, 2b. 2c, the load constant is read from the load constant table 30 shown in Table 1 from the rated capacity signal, the differential temperature signal, the operation mode signal, and the ON-OFF discrimination signal, and this load constant is set to the indoor heat exchanger capacity setting value. Then, the capacity correction load constant is calculated, and the sum of the capacity correction load constants is multiplied by the constant to determine the frequency of the compressor 3.

At this time, this constant is changed according to the number of operating vehicles.

As an example, the number of operating units is 2 (2a, 2).
b, 2c), 2 rooms (2a, 2b), 1 room (2a) when the signals from the indoor units 2a, 2b, 2c are also in Table 2 will be described.

From the table 2, the indoor units 2a, 2
The load constants of b and 2c are 15, 10 and 19, respectively, the heat exchanger capacity setting values are 2.9, 2.9 and 3.1, and the capacity correction load coefficient Hn is Hn = 15 / 2.9 + 10 / 2.9 + 19 / 3.1 = 1
4.7 (rounded to the second decimal place), and the frequency Hz of the compressor 3 is
Hz = A × Hn = A × 14.7.

The result of this calculation is sent as a frequency signal to a compressor drive circuit (not shown) to control the frequency of the compressor 3. After that, the indoor units 2a, 2b, 2c are every predetermined cycle.
Each heat exchanger capacity setting value, rated capacity signal, differential temperature signal, operation mode signal, and ON-OFF discrimination signal are calculated, and the calculation result is sent to a compressor drive circuit (not shown) as a frequency signal. Then, the frequency of the compressor 3 is controlled.

In the two-room operation, from Table 2, the indoor units 2a, 2
The load constants of b and 2c are 15, 10 and 0, the heat exchanger capacity setting values are 2.9, 2.9 and 3.1, and the capacity correction load coefficient Hn is Hn = 15 / 2.9 + 10 / 2.9 + 0 / 3.1 = 8.
6 (rounded to the second decimal place), and the frequency Hz of the compressor 3 becomes Hz = B × Hn = B × 8.6 using another constant B.

Further, in the single room operation, from Table 2, the indoor unit 2a,
The load constants of 2b and 2c are 15, 0 and 0, the heat exchanger capacity set values are 2.9, 2.9 and 3.1, and the capacity correction load coefficient Hn is Hn = 15 / 2.9 + 0 /. 2.9 + 0 / 3.1 = 5.2
(The second decimal place is rounded off), and the frequency Hz of the compressor 3 is Hz = C × Hn = C × 5.2 using another constant C.

This is shown in the figure, which is a relationship diagram between the capacity correction load coefficient and the compressor frequency in FIG.

Although the above description was mainly made for cooling, the same control can be made for heating.

In this way, the compressor frequency is controlled according to the sum of the required capacity of each room and the number of operating units, so that the optimum compressor operation can be performed according to the indoor required load. Therefore, it is possible to improve comfort and save energy while finely and optimally controlling the refrigeration cycle according to the required load of the indoor unit.

Fifth Embodiment Next, an air conditioner according to a fifth embodiment of the present invention will be described with reference to the drawings.

FIG. 7 shows a refrigeration cycle of the air conditioner according to the present embodiment. In the outdoor unit 1, an inverter-driven variable frequency compressor 3 (hereinafter simply referred to as compressor), An outdoor heat exchanger 4 and a four-way valve 5 for switching between heating and cooling are provided, while an indoor heat exchanger 6d is provided inside the indoor unit 2d. The outdoor unit 1 and the indoor unit 2d are the outdoor unit 1
A liquid side branch pipe 8d connected to the liquid side main pipe 7 provided inside,
Also, they are connected by a gas side branch pipe 10d connected to the gas side main pipe 9 provided in the outdoor unit 1. Liquid side branch pipe 8
An electric expansion valve 11d capable of pulse-controlling a valve opening using a stepping motor is interposed in d, and an indoor temperature sensor 17d that detects a room temperature of a room in which the indoor unit is installed is installed in the indoor unit 2d, and There is provided an operation setting means 18d capable of setting an operation mode (cooling or heating) desired by a resident, room temperature, operation and stop.

Next, regarding the method of controlling the compressor frequency,
This will be described with reference to the block diagram showing the flow of control of the compressor frequency shown in FIG. 8 and the temperature zone division diagram of the temperature difference ΔT between the room temperature Tr and the set temperature Ts shown in FIG.

First, in the indoor unit 2d, the output of the indoor temperature sensor 17d is sent from the indoor temperature detecting means 21 to the differential temperature calculating means 22 as a temperature signal, and the indoor temperature setting means 23 sets the operation setting means 18d. The set temperature and the operation mode are discriminated and sent to the temperature difference calculating means 22. In the temperature difference calculating means 22, the temperature difference ΔT (= Tr−Ts)
Is calculated and converted into the load number Ln value shown in FIG. 3 and used as the temperature difference signal.

For example, Tr = 27.3 ° C. during cooling operation,
If Ts = 26 ° C., the temperature difference ΔT = 1.3 ° C., Ln =
It becomes 6.

Further, the ON-OFF discriminating means 24 discriminates the operation (ON) or stop (OFF) of the indoor unit 2d set by the operation setting means 18d, and the rated capacity storage means 25 stores the rated capacity of the indoor unit 2d. And remember
The indoor heat exchanger capacity set value of the indoor unit 2d is stored in the heat exchanger capacity set value storage means 36, and these heat exchanger capacity set value signal, rated capacity signal, differential temperature signal, operation mode signal, ON The -OFF discrimination signal is sent from the signal transmitting means 26 to the signal receiving means 27 of the outdoor unit 1. The signal received by the signal receiving means 27 is transmitted to the compressor capacity control means 28.

In the compressor capacity control means 28, the indoor unit 2d
Rated capacity signal, differential temperature signal, operation mode signal, ON-O
The load constant table 30 shown in Table 1 from the FF discrimination signal
The load constant is read from the load constant, the load constant is divided by the indoor heat exchanger capacity setting value to calculate a capacity correction load constant, and the capacity correction load constant is multiplied by the constant to determine the frequency of the compressor 3.

As an example, the signals from the indoor unit 2d are shown in Table 5.
The case will be described.

[Table 5]

From Table 5, the load constant of the indoor unit 2d is 15
Then, the heat exchanger capacity set value becomes 2.9, the capacity correction load coefficient Hn becomes Hn = 15 / 2.9 = 5.2 (rounded to the second decimal place), and the frequency Hz of the compressor 3 becomes , D are constants,
Hz = D × Hn = D × 5.2.

The result of this calculation is sent as a frequency signal to a compressor drive circuit (not shown) to control the frequency of the compressor 3. Thereafter, the heat exchanger capacity setting value of the indoor unit 2d, the rated capacity signal, the differential temperature signal, the operation mode signal,
Calculation is performed from the ON-OFF discrimination signal, and the calculation result is sent to a compressor drive circuit (not shown) as a frequency signal to control the frequency of the compressor 3.

Although the above description has been made mainly for cooling, the same control can be performed for heating.

Thus, not only the rated capacity in the room,
Since the compressor frequency is controlled according to the heat exchanger capacity setting value caused by the difference in the indoor unit configuration, it is possible to operate the compressor optimally for the required indoor load. In addition, it is possible to control with an extremely small amount of data compared to having data for each different type of indoor unit. Therefore, it is possible to improve comfort and save energy while finely and optimally controlling the refrigeration cycle according to the required load of the indoor unit.

[0072]

Since the present invention is constructed as described above, it has the following effects. According to the multi-room air conditioner of the present invention, the indoor unit has an indoor temperature setting unit capable of setting a desired indoor temperature, an indoor temperature detecting unit detecting the indoor temperature, an indoor temperature setting unit and an indoor temperature detecting unit. Temperature difference calculating means for calculating the temperature difference between the set indoor temperature and the indoor temperature from the hand temperature, rated capacity storage means for storing the rated capacity of the indoor unit, and indoor heat exchange for storing the heat exchanger capacity of the indoor unit Load capacity constant value storage means and a load constant that divides the range that the differential temperature can take into a plurality of temperature zones and determines and stores a load constant corresponding to the indoor load for each temperature zone and for each rated capacity of the indoor unit. And a compressor capacity control means provided in the outdoor unit, using the data obtained from the differential temperature calculation means, the rated capacity storage means, the indoor heat exchanger capacity set value storage means, and the load constant storage means. , Formula to calculate compressor frequency Since the operating frequency of the variable displacement compressor was controlled based on this calculation formula, the compressor frequency can be optimally controlled and the operation that meets the indoor required load can be performed, and the refrigeration cycle It is possible to improve comfort and save energy while finely and optimally controlling the unit according to the required load of the indoor unit.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of a multi-room air conditioner according to first to fourth embodiments of the present invention.

FIG. 2 is a control block diagram of a compressor frequency according to the first embodiment of the present invention.

FIG. 3 (a) is a temperature zone division diagram during cooling of the differential temperature ΔT, and FIG. 3 (b) is a temperature zone division diagram during heating.

FIG. 4 is a control block diagram of a compressor frequency according to the second embodiment of the present invention.

FIG. 5 is a control block diagram of a compressor frequency according to the third embodiment of the present invention.

FIG. 6 is a graph showing a relationship diagram between the total sum of indoor unit rated capacities and the compressor capacities (operating frequencies) that are operating in the multi-room air conditioner according to the fourth embodiment of the present invention.

FIG. 7 is a refrigeration cycle diagram of the air-conditioning apparatus according to Embodiment 5 of the present invention.

FIG. 8 is a control block diagram of a compressor frequency according to the fifth embodiment of the present invention.

FIG. 9 is a refrigeration cycle diagram of a conventional multi-room air conditioner.

10 is a control block diagram of a compressor frequency in the conventional multi-room air conditioner of FIG.

[Explanation of symbols]

1 outdoor unit, 2a, 2b, 2c, 2d indoor unit, 3
Variable frequency compressor, 4 outdoor heat exchanger, 5 four-way valve, 6a, 6b, 6c, 6d indoor heat exchanger, 7 liquid side main pipe, 8a, 8b, 8c, 8d liquid side branch pipe, 9
Gas side main pipe, 10a, 10b, 10c, 10d Gas side branch pipe, 11a, 11b, 11c, 11d Electric expansion valve, 17a, 17b, 17c, 17d Indoor temperature sensor, 18a, 18b, 18c, 18d Operation setting means,
21 indoor temperature detecting means, 22 differential temperature calculating means, 23
Indoor temperature setting means, 24 ON-OFF discrimination means,
25 rated capacity storage means, 26 signal transmission means, 2
7 signal receiving means, 28 compressor capacity control means, 30
Load constant table, 31 load constant storage means, 32
Operating number recognition means, 36 heat exchanger capacity set value storage means, 37 rated capacity coefficient table, 38 common load constant table, 39 form correction value storage means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuhiro Nakamura             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Tokuya Asada             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Toshihiko Nishimoto             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Hiroshi Arashima             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Kenji Shirai, Inventor             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Naoto Fujita             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 3L060 AA03 AA05 CC02 DD02 EE04                 3L092 AA02 AA03 DA14 EA15 FA05                       GA09 GA10 JA14 KA13 KA15                       LA07

Claims (5)

[Claims] 1. A multi-chamber air conditioner in which a single outdoor unit having a variable capacity compressor and an outdoor heat exchanger and a plurality of indoor units having an indoor heat exchanger are connected to each other. In each of the plurality of indoor units, the indoor temperature setting means for arbitrarily setting the temperature of the room in which the indoor unit is installed, the indoor temperature detecting means for detecting the indoor temperature, and the indoor temperature setting means are set. A temperature difference calculating means for calculating a temperature difference between the temperature and the room temperature detected by the room temperature detecting means,
Rated capacity storage means for storing the rated capacity of the indoor unit, ON / FF determination means for determining whether each indoor unit is operating or stopped, and a heat exchanger for storing the indoor heat exchanger capacity set value of the indoor unit While the capacity setting value storage means is provided, the outdoor unit,
The differential temperature calculation means, the rated capacity storage means, and the ON
A compressor capacity control means is provided for controlling the capacity of the variable capacity compressor at predetermined intervals using the data obtained from the ON / OFF discrimination means, and the compressor capacity control means stores the heat exchanger capacity set value storage. A multi-room air conditioner characterized in that an arithmetic expression of a compressor capacity is derived based on an indoor heat exchanger capacity set value stored in the means to control the compressor capacity. 2. A form correction in which a value of a capacity ratio between a heat exchanger capacity value of an indoor unit and a reference heat exchanger capacity value is stored as a form correction value instead of the heat exchanger capacity set value storage means. A value storage means is provided, and the compressor capacity control means controls the compressor capacity by deriving an arithmetic expression of the compressor capacity based on the shape correction value stored in the shape correction value storage means. 1. The multi-room air conditioner according to 1. 3. The compressor capacity control means, in addition to the indoor heat exchanger capacity set value stored in the heat exchanger capacity set value storage means, a rated capacity coefficient set for each indoor unit rated capacity. The multi-room air conditioner according to claim 1, wherein an arithmetic expression of the compressor capacity is derived based on the compressor capacity to control the compressor capacity. 4. The compressor capacity control means changes the arithmetic expression of the compressor capacity according to the number of operating indoor units,
4. The compressor according to claim 1, wherein the compressor capacity is controlled.
The multi-room air conditioner according to any one of 1. 5. An air conditioner in which a single outdoor unit having a variable capacity compressor and an outdoor heat exchanger and a single indoor unit having an indoor heat exchanger are connected to each other. The indoor temperature setting means for arbitrarily setting the indoor temperature in which the indoor unit is installed, the indoor temperature detecting means for detecting the indoor temperature, the temperature set by the indoor temperature setting means and the indoor temperature detecting means. A temperature difference calculation means for calculating a temperature difference from the detected indoor temperature, a rated capacity storage means for storing a rated capacity of the indoor unit, and an ON / FF determination means for determining whether the indoor unit is in operation or stopped. A heat exchanger capacity set value storage means for storing an indoor heat exchanger capacity set value of the indoor unit, while the outdoor unit has the differential temperature calculation means, the rated capacity storage means, and the ON / OFF determination means. With more available data Compressor capacity control means for controlling the capacity of the variable capacity compressor at predetermined intervals is provided, and the compressor capacity control means sets the indoor heat exchanger capacity setting stored in the heat exchanger capacity setting value storage means. An air conditioner characterized in that an arithmetic expression of a compressor capacity is derived based on the value to control the compressor capacity.