JPS63294462A - Multiple type air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a multi-type air conditioner equipped with a plurality of indoor units, and in particular, the compressor The present invention relates to a multi-type air conditioner that properly performs capacity G control and refrigerant circulation control to each indoor unit.

(Prior Art) Generally, this type of multi-type air conditioner has one outdoor unit 1 and a plurality of indoor units 2.3 as shown in FIG.
are connected to form a refrigeration cycle 4, and by driving this refrigeration cycle 4, air conditioning such as heating and cooling of a plurality of rooms can be performed simultaneously.

(Problem to be solved by the invention) Generally, the plurality of indoor units 2 and 3 provided in a conventional multi-type air conditioner have the same unit capacity, and the unit capacity of the indoor units 2 and 3 differs. No particular consideration was given to the situation.

For this reason, if the unit contents of multiple indoor units 2.3 connected to the outdoor unit 1 are different, the compressor may be operated appropriately according to the capacity of each unit.
It is difficult to control the amount of circulating refrigerant to each indoor unit 2.3, and it is difficult to freely select the capacity of each indoor unit 2, 3 and connect it to the outdoor unit 1.

This invention was made in consideration of the above-mentioned circumstances, and includes:
To provide a multi-type air conditioner in which a plurality of capacity indoor units can be connected to one outdoor unit, and the operation of each indoor unit can be controlled individually.

Another object of the present invention is to provide a multi-type air conditioner in which the capacity of each indoor unit can be freely selected according to the maximum indoor load within the capacity of the outdoor unit.

[Structure of the invention]

(Means for Solving Problems) A multi-type air conditioner according to the present invention configures a refrigeration cycle by connecting a plurality of indoor units to an outdoor unit equipped with a compressor capable of capacity control operation using an inverter. In the multi-type air conditioner, a compressor capacity control operation is provided in which the output frequency of the inverter for driving the compressor is controlled according to the ratio of the total capacity of the operating indoor units and the capacity of the outdoor unit, and the liquid side of the refrigeration cycle is A refrigerant circulation a control device is installed in the refrigerant piping to adjust and control the amount of refrigerant circulated to each indoor unit 1.
It's a type of thing.

(Function) This multi-type air conditioner configures a refrigeration cycle by connecting multiple indoor units to an outdoor unit, while controlling the output frequency of the inverter for driving the compressor using a compressor capacity control device. Since the control is performed according to the ratio between the total capacity of the unit and the capacity of the outdoor unit, the compressor incorporated in the outdoor unit can be efficiently operated with a capacity that matches the total capacity of the operating indoor unit.

In addition, a refrigerant circulation control device d is installed on the liquid side refrigerant piping of the refrigeration cycle.
With this refrigerant circulation control device, the amount of refrigerant circulated to each indoor unit can be individually controlled, and an appropriate amount of refrigerant circulated according to the capacity of each indoor unit can be provided.

(Embodiment) Hereinafter, an embodiment of the multi-type air conditioner according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a refrigerant piping system diagram of a multi-type air conditioner according to the present invention.
It has a refrigeration cycle 14 configured by connecting a plurality of indoor units 12 and 13 (in the illustrated example, two indoor units 12 and 13) to one outdoor unit 10 via a branch unit 11. The outdoor unit 10 is equipped with a compressor 16 whose capacity is controlled by an inverter 15, and an accumulator 17 is connected to the suction side of the compressor 16.

The refrigeration cycle 14 includes a compressor 16 built into the outdoor unit 10, a four-way valve 18, one outdoor heat exchanger 2!
It extends into the branching unit 11 via the heating expansion mechanism 20 and the liquid tank 21 in order, and within this branching unit 11, the liquid refrigerant piping 22 is branched according to the number of indoor units 12. Branched liquid refrigerant pipes 22a, 22b
There is a refrigerant circulation ω control device 23 and a cooling expansion mechanism 24.
are provided, and each refrigerant pipe 22a, 22b is connected to an indoor heat exchanger 25a, 25b of the indoor unit 12.13. A solenoid valve 27a as an on-off valve is installed in the branch unit 11 in the gas side cold tube pipes 26a and 26b from the indoor heat exchangers 2'5a and 25b.

27M+ is provided and merged, and this refrigerant distribution @27
is connected to the compressor 16 via a four-way valve 18. In this way, the refrigeration cycle 14 constitutes a closed refrigerant circulation circuit.

EI for heating and cooling of the refrigeration cycle 14, an expansion machine groove mechanism, and 24 an expansion valve (a capillary tube may also be used) 3
It consists of 0.31. An expansion valve bypass circuit is provided to bypass each of the expansion valves 30 and 31, and check valves 32 and 33 are provided in this bypass circuit.

On the other hand, the refrigerant circulation amount control device 23 provided in the branch unit 11 controls the liquid refrigerant branch pipe 22a of the refrigeration cycle 14.
, 22b, and these electric outflow regulating valves 35a, 35b are provided corresponding to each indoor unit 12, 13, respectively, and are guided to each indoor unit 12, 13. The refrigerant circulation m is controlled in a secondary manner.

In order to adjust and control the refrigerant circulation r to each indoor unit 12.13, the valve opening degree of the electric outflow regulating valves 35a, 35b is determined by the capacity of the corresponding indoor unit 12.13 and the outdoor unit 1.
According to the ratio with the capacity of 0 (]
Adjustments are made in advance as shown in the figure.

Further, this air conditioner is provided with a compressor capacity control device 37 that controls the output frequency of the inverter 15 for driving the combrella. Compressor capacity control device 3
7, as shown in FIG. 3, indoor microcomputers 38 and 39 which are provided in each indoor unit 12 and 13 and output an ON-OFF command signal for the compressor 16, and each indoor microcomputer 3.
8. Multi-control microcomputer 40 that inputs the compressor ○N-0FF command signal from 39 to calculate the requested inverter output signal, and an outdoor controller that inputs this requested inverter output signal and outputs the inverter output frequency command signal to the inverter 15. It is equipped with a microcomputer 41.

The indoor microcontrollers 38 and 39 compare the difference Δ between the intake air temperature detected by a temperature sensor (not shown) and the room temperature set temperature, and output a compression ON command signal until the intake air temperature reaches the room temperature set temperature. After reaching this point, a compression OFF command signal is output.

On the other hand, the multi-control microcomputer 40 is provided in the branch unit 11, and upon receiving the compression ON command signal from each of the three indoor microcomputers 38, it determines the total capacity of the indoor units 12 and 13 that are outputting the ON command signal, and A required inverter output frequency is calculated according to the ratio with the capacity of the outdoor unit 10, and this required inverter output signal is output to the outdoor microcomputer 41 of the outdoor unit 10.

Next, the heating and cooling function of the Marub complete air conditioner will be explained.

During cooling operation, the four-way valve 18 of the refrigeration cycle 14 housed in the outdoor unit 10 is set to the cooling side. When the compressor 4/16 is operated in this state, the cold tsl output from the compressor 16 is guided through the west valve 18 to the outdoor heat exchanger 19, where it is condensed. The outdoor heat exchanger 19 and the condensed refrigerant are transferred to the electric outflow adjustment valve 3.
5, is guided to the expansion valve (or capillary tube) 31 of the cooling expansion mechanism 24, undergoes adiabatic expansion, and is sent to the indoor heat exchangers 325a and 25b of each indoor unit 12 and 13, where the guide is cooled and evaporated.

The refrigerant evaporated in the indoor heat exchangers 25a and 25b is transferred to the solenoid valve 2.
Air is sucked into the compressor 16 from 7a and 27b through the four-way valve 18 and the humulator 17, and is prepared for the next cooling cycle.

Also, during heating operation, the four-way valve 18 of the refrigeration cycle 14
is switched to the heating side, and the compressor 16 is operated.

The refrigerant discharged from the recompressor 16 by the operation of the compressor 16 passes through the four-way valve 18 to each indoor unit 1.
It is guided to the indoor heat exchangers 25a and 25b of 2.13, where it exchanges heat with indoor air to heat the room.

The refrigerant condensed by indoor heating is sent from the check valve 33 to the expansion valve 30 of the heating expansion mechanism 20 via electric flow rate adjustment valves 35a and 35b, where it is adiabatically expanded. The refrigerant expanded in the expansion valve 30 is then sent to one outdoor heat exchanger, where it absorbs heat and is evaporated. The evaporated refrigerant is returned to the compressor 16 from the accumulator 17 via the four-way valve 18, and is prepared for the next heating operation.

Currently, there are one outdoor unit 10 and two indoor units 1-1.
2.13 is connected via the branch unit 11, and the maximum output frequency of the inverter 15 that performs the capacity control operation of the compressor 16 is set to, for example, 90 Hz, and the capacity of the outdoor unit 10 (when the compressor is at the maximum rotational speed and when the inverter R is operating at high output frequency) ) is 58P (horsepower), the capacity of one indoor unit 12 is 2HP, and the capacity of the other indoor unit 13 is 31-IP.
The output frequency of 5 is controlled as follows.

Indoor microcomputer 38.3 of both indoor units 12.13
When the compressor ON command signal is input from 9 to the multi-control microcomputer 40, the multi-control microcomputer 40 determines the required inverter output frequency Pf from the ratio of the total capacity 4 of the operating indoor units 12.13 to the capacity of the outdoor unit 10. is calculated by (1), and the required inverter output frequency Pf of 90H7 is
is output to the outdoor microcomputer 41 of the outdoor unit 10.

When the compressor ON command signal is output only from the indoor microcomputer 38 of one indoor unit 12, the multi-control microcomputer 40 similarly calculates the required inverter output frequency Pf1 using the following formula, and calculates the required inverter output frequency Pf1 of 36 Hz. It is output to the outdoor microcomputer 41.

When the compressor ON command signal is output only from the other indoor unit 13, it is calculated in the same way, and 5
A required inverter output frequency 'IIPf2 of 4 Hz is output to the outdoor microcomputer 41.

Moreover, when the compressor OFF command signal is output from both indoor units 12 and 13, the required inverter output frequency of OHZ is output.

The outdoor microcomputer 41 is a multi-control microcomputer 40.
It receives a requested inverter output frequency signal from the inverter 15 and outputs an inverter output frequency command signal to the inverter 15.

On the other hand, the refrigerant flow rate control device 23 controls each indoor unit 12.
Ti initial flow level adjustment valve 35a corresponding to No. 13.

The opening degree of the valve 35b is set according to the relationship shown in FIG. 2 according to the capacity ratio of the corresponding indoor unit 12, 13 and outdoor unit 10. For the indoor units 12 and 13 to which the compressor OFF command signal is output, the corresponding electric flow rate adjustment valve 35 and gas side solenoid valves 27a and 27b are closed.

Therefore, the indoor unit 12 with a capacity of 2 HP and the indoor unit 13 with a capacity of 3 HP are connected to the outdoor unit 10, and the compressor is turned on from both indoor units 12 and 13.
When the command signal is being output, the inverter output frequency from the multi-control microcomputer 40 is 90H2,
The valve opening degrees of the corresponding electric flow rate regulating valves 35 are set to 50% and 72%, respectively, from the relationship graph in FIG.

When the compressor ON command signal is output from only one indoor unit 12 side, the inverter output frequency is 37 Hz, and the corresponding electric flow rate adjustment valves 35a, 35
The valve opening degree of b is set to 50% and 0%.

Further, when the compressor ON command signal is output only from the other indoor unit 13 side, the inverter output frequency is 54Hz, and the corresponding electric flow ω adjustment valves 35a, 3
The valve opening degrees of 5b are 0% and 72%, respectively.

Turn off the compressor from both indoor units 12.13
When the command signal is being output, the inverter output frequency is OH2, and the valve opening degrees of the corresponding electric flow rate adjustment valves 35a and 35b are each 0%.

Thereby, it is possible to exhibit appropriate refrigerant circulation and refrigeration capacity in accordance with the operating capacity of the indoor units 12, 13, and it is possible to maintain the refrigeration cycle in an appropriate state. Figure 4 shows the experimental results of a multi-type air conditioner that supports this refrigeration cycle.

FIG. 4 shows that when only one indoor unit 12 is outputting a compressor ON command signal (hereinafter referred to as ON command), when only the other indoor unit 13 is ON commanded, both indoor units 12 and 13 are ON commands. This is a diagram that allows comparison between the actual value and expected value of the cooling capacity when the cooling capacity is being output. As can be seen from this figure, the total refrigerant circulation is controlled by inverter output frequency control,
By controlling the amount of refrigerant circulated individually to each indoor unit 1 to 12.13 by controlling the opening degree of the electric flow rate adjustment valves 35a and 35b, the required refrigerant capacity is exerted and the refrigeration capacity is distributed to each indoor unit 12.13. It can be done efficiently. This means that when the operating capacity ω of each indoor unit 12.13 changes, for example, the capacity of both indoor units 12.13 may be set to 2°51-IP, or 1 I'.
The same applies to the case of P: 41-IP, and the same applies to the case of heating operation.

In one embodiment of the present invention, an example is shown in which two indoor units are connected to one outdoor unit, but it can also be applied to a case where three or more indoor units are connected. The mechanism may be provided in the indoor unit.

〔Effect of the invention〕

As described above, in the multi-type air conditioner according to the present invention, the compressor capacity ff1f, lJ control controls the output frequency of the inverter for driving the compressor according to the ratio between the total capacity of each indoor unit and the capacity of the outdoor unit. In addition to providing a refrigerant circulation control device for adjusting and controlling the refrigerant circulation ω to each indoor unit in the liquid side refrigerant piping of the refrigeration cycle, one outdoor unit can accommodate multiple indoor units with different capacities. Even if connected, it is possible to give an appropriate amount of refrigerant circulation to each indoor unit according to its capacity, and the operation can be controlled individually for each indoor unit, making the air conditioning operation of the refrigeration cycle more efficient. It can be done.

In particular, by installing a compressor capacity control device and a refrigerant circulation semi-control device in a multi-type air conditioner, it is possible to freely select the capacity combination of each indoor unit, which is optimal for each user's air conditioning space. Capacity indoor units can be installed.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the multi-type air conditioner according to the present invention, and FIG. 2 is a diagram showing the valve opening degree of the electric flow rate adjustment valve according to the capacity ratio of the indoor unit to the T outside unit. Third
The figure is a system diagram showing the command system of the compressor capacity control device provided in the multi-type air conditioner, and Figure 4 shows the refrigeration performance when the multi-type air conditioner is equipped with a 2HP indoor unit and a 3HP indoor unit. The diagram shown in FIG. 5 is a diagram showing a conventional multi-type air conditioner. 10...Outdoor unit, 11...Branch unit 1-1
12.13... Indoor unit, 14... Refrigeration cycle, 15... Inverter, 16... Compressor,
1...Outdoor heat exchanger, 20...Heating expansion mechanism,
21... Liquid tank, 23... Refrigerant circulation semi-control device, 24... Cooling expansion mechanism, 25a, 25b...
・Indoor heat exchanger, 30.31-M! Inflated valve, 35a, 35
b-...Electric flow rate adjustment valve, 37...Compressor capacity control 11 device, 38.39...Indoor microcomputer, 40...
...Multi-controller 1 to roll microcontroller, 41...Outdoor microcontroller.

Claims (1)

[Scope of Claims] 1. In a multi-type air conditioner in which a refrigeration cycle is configured by connecting a plurality of indoor units to an outdoor unit equipped with a compressor capable of capacity control operation using an inverter, the operating indoor unit A compressor capacity control device is provided to control the output frequency of an inverter for driving the compressor according to the ratio between the total capacity and the capacity of the outdoor unit, and the amount of refrigerant circulated to each indoor unit is adjusted in the liquid side refrigerant piping of the refrigeration cycle. A multi-type air conditioner characterized by being provided with a refrigerant circulation amount control device. 2. The compressor capacity control device controls the output frequency of the inverter that performs compressor capacity control operation, and is installed in each indoor unit and turns the compressor ON.
-An indoor microcomputer that outputs the OFF command signal, a multi-control microcomputer that inputs this compressor ON command signal and calculates the required inverter output signal, and a multi-control microcomputer that inputs the above required inverter output signal and outputs an inverter output frequency command signal to the inverter. The multi-type air conditioner according to claim 1, comprising an outdoor microcomputer that performs the following operations. 3. The refrigerant circulation amount control device is equipped with an electric flow rate adjustment valve provided in the liquid side refrigerant piping of the refrigeration cycle in correspondence with each indoor unit, and adjusts the valve opening degree of each electric flow rate adjustment valve to the corresponding indoor unit. The multi-type air conditioner according to claim 1, wherein the multi-type air conditioner is adjusted and set according to the ratio between the capacity and the capacity of the outdoor unit. 4. The multi-type air conditioner according to claim 1, wherein the gas side refrigerant pipe of the refrigeration cycle is provided with an on-off valve corresponding to each indoor unit.