JPH01302075A - Multi-room type air conditioner - Google Patents

Abstract

PURPOSE:To perform a dehumidifying operation which can take much latent heat by reducing the control width of the opening of a door motor-driven expansion valve in each room apparatus at the time of dehumidifying operation mode smaller than that at the time of room cooling operation mode. CONSTITUTION:In room controllers 60A to 60C of room apparatuses 45A to 45C, sucked air temperatures are detected by sucked air temperature detectors 51A to 51C, set room temperature values set by remote controllers 54A to 54C are detected by set room temperature detectors 50A to 50C, and air conditioning loads are calculated from the set room temperature values and the sucked air temperatures by air conditioning load calculators 52A to 52C. Then, controlling widths are determined by valve opening control width determining means 62A to 62C in response to preset cooling and dehumidifying operation modes, the altering widths of the openings of motor-driven expansion valves are determined by valve opening altering width determining means 57A to 57C, thereby controlling room motor-driven expansion vale controllers 49A to 49C. In this case, since the room motor-driven expansion valve controlling widths of the dehumidifying operation mode is smaller than those of the cooling operation mode to be controlled in a reducing trend, its evaporation temperature is low, the ratio of latent heat exchanging amount is increased, and a large dehumidifying effect is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to capacity control and cycle control of a multi-room air conditioner.

Conventional technology In recent years, individual air conditioning has been progressing in building air conditioning.
Particularly in multi-room air conditioners, capacity control and individual control of each indoor unit are attracting attention.

An example of the conventional multi-room air conditioner mentioned above will be described below with reference to the drawings.

FIG. 6 and FIG. 7 show a refrigeration cycle diagram and a block diagram. In FIG. 6, a variable capacity compressor whose capacity can be varied by a 31-piece inverter 32, 33 a pole variable compressor whose capacity can be varied by changing the number of poles of the motor by a pole switch 34, 35 an oil separator, 3e is a four-way valve that switches the heating and cooling cycle, 37 is an outdoor heat exchanger, 38 is an outdoor electric expansion valve, 39 is an accumulator, and 40 is an El
A refrigerant temperature sensor installed in the piping on the opposite side of the outdoor heat exchanger 37 of the outside electric expansion valve 38, 41 a pressure detector installed in the piping between the west valve 36 and the indoor units 45A, 45B, 450, and 42 An outdoor controller including an outdoor electric expansion valve controller 43 for controlling the outdoor electric expansion valve 38 and the like is provided in the outdoor unit 44 . The oil separator 36 is connected to an accumulator 39 through an oil return pipe 47 equipped with a pressure reducer 46 . Indoor units 45A, 45B,
45C has indoor heat exchangers 46A and 46B, respectively.

46C1 Indoor electric expansion valves 47A, 47B, 47C.

Indoor electric expansion valve controllers 49A, 49B that control the indoor electric expansion valves 47A, 47B, 4γC.

49C1 setting room temperature detector 50A, 50B, esoc.

Indoor controllers 53A, 53B, 53C, remote control 54A, including suction air temperature detectors 51A, 51B, 51C1, air conditioning load detectors 52A, 52B, 520, etc.
Equipped with 54B and 54G.

The operation of the multi-room air conditioner configured as described above will be described below.

First, in cooling operation, high-temperature, high-pressure gas refrigerant discharged from the variable capacity compressor 31 and polar variable compressor 33, which are installed in parallel, is transferred to the outdoor heat exchanger 37 via the oil separator 36 and the four-way valve 36. The air flows into the indoor units 45A, 45B, and 45 connected in parallel through the outdoor electric expansion valve 38.
The pressure is reduced by the indoor electric expansion valves 47A, 47B, and 47C of G, and is evaporated and vaporized by the indoor heat exchangers 48A, 48B, and 46C. Return to 33. In addition, during heating operation, the high temperature and high pressure gas refrigerant discharged from the variable capacity compressor 31 and the polar variable compressor 33 is passed through the oil separator 35 and the four-way valve 3θ to the indoor heat exchangers 46A, 46B, 46C.
It flows into the indoor electric expansion valves 47J and 47B and condenses into liquid.
, 47C, is depressurized by the outdoor electric expansion valve 38, evaporated by the outdoor heat exchanger 37, and returned to the variable capacity compressor 31 and polar variable compressor 33 via the four-way valve 38 and accumulator 39.

Next, capacity control and system control will be explained with reference to FIGS. 7 to 10. The capacity control of each compressor 31 and 33 is performed according to the pressure detected by the pressure detector 41. During cooling, the low pressure side pressure is detected and set to the predetermined low pressure, and during heating, the high pressure side pressure is detected.
TEP11), perform to the predetermined set high pressure,
Pressure difference calculation means 5 calculates the difference between the detection output and the set pressure.
5TEP12), determination and control during capacity change in which the combination steps of the predetermined capacity control combinations (Table 1) of both normal compressors 31 and 33 are changed as shown in Table 2 according to the pressure difference. The inverter 32 and the pole number switch 34 are controlled by the means 66 (STEP13, 5TEP1
4).

(Table 1) Capacity control combination step table (Table 2) Pressure difference - capacity change width correspondence table Each indoor unit 45A, 45B,
In 45C, indoor controllers 53A and 53B
, 63C, the suction air temperature sensor 6 detects the suction air temperature.
1A, 51B.

S1C detects 5TEP21), remote control 64A.

The room temperature detectors soA, 5oB, and esoC detect the room temperature set values set at the room temperature set values 54B and 54C, and the air conditioning load calculators 52A and 52B calculate the air conditioning load from the room temperature set values and the intake air temperature.

52C and 5TEP23), the valve opening degree changing determining means 57A, 57B determines that the valve opening degree of the electric expansion valve is being changed as shown in Table 3 according to the air conditioning load.

57C (STEP 24), and control the indoor electric expansion valve controllers 49A, 49B, and 49C (STEP 24).
25).

Regarding the outdoor electric expansion valve 38, the valve opening degree is set to full open by the outdoor electric expansion valve controller 43 during cooling operation. During heating operation, the refrigerant temperature difference calculation means 58 calculates the temperature difference between the subcooled liquid refrigerant temperature of the outdoor electric expansion valve 38 @ detected by the refrigerant temperature detector 4o and the predetermined set refrigerant temperature in (STEP 31). Then, the outdoor electric expansion valve controller 43 determines the valve opening change width of the outdoor electric expansion valve 38 as shown in Table 4 by the outdoor valve opening change width determining means 69. Control is performed (STEP 33).

(Table 4) Refrigerant temperature difference - Outdoor valve opening change range correspondence table Problem to be solved by the invention However, in the above configuration, during cooling operation, the indoor electric expansion valve is adjusted according to the air conditioning load of each indoor unit. Since the indoor electric expansion valve is controlled using the entire valve opening range, the valve opening is determined to correspond to the air conditioning load, and like dehumidification operation, the evaporation temperature is lowered and more latent heat is captured. The problem was that it was impossible to drive like that.

In view of the above-mentioned problems, the present invention provides a multi-room air conditioner that enables not only cooling operation but also dehumidification operation that can remove a large amount of latent heat.

Means for Solving the Problems In order to solve the above problems, the multi-room air conditioner of the present invention connects one outdoor unit equipped with two compressors and a plurality of indoor units in parallel. , the capacity control of the two compressors is controlled based on a pressure detector, and the valve opening control width of the indoor electric expansion valve of each indoor unit is smaller in the dehumidification operation mode than in the cooling operation mode. It is equipped with the following configuration.

Effect: Due to the above-described configuration, the present invention performs control such that the indoor electric expansion valve is slightly throttled during dehumidification operation compared to during cooling operation, so the evaporation temperature is low and the ratio of latent heat exchange increases, and the temperature decreases more than when the room temperature decreases. A great dehumidifying effect can be obtained.

EXAMPLE Hereinafter, a multi-room air conditioner according to an example of the present invention will be described with reference to the drawings. In addition, in the description, the same numbers are given to the same parts as in the conventional example.

1 and 2 show a refrigeration cycle diagram and a block diagram of a multi-room air conditioner according to an embodiment of the present invention. In FIG. 1, 31 is a variable capacity compressor whose capacity can be varied by an inverter 32, 33 is a pole variable compressor whose capacity can be varied by changing the number of poles of the motor with a pole number switch 34, and 36 is an oil separator. , 36 is a west valve for switching the heating and cooling cycle, 37 is an outdoor heat exchanger, 38 is an outdoor electric expansion valve, 39 is an accumulator, and 40 is a mJ outdoor electric expansion valve 38 provided on the pipe on the opposite side of the outdoor heat exchanger 37. 41 is a four-way valve 36 and indoor unit aoA.
, aoB, pressure detector installed in the piping between soC, 42
is an outdoor controller having an outdoor electric expansion valve controller 43 for controlling the outdoor electric expansion valve 38, etc., and is provided in the outdoor unit 44. An oil return pipe 47 equipped with a pressure reducer 46 connects the oil separator 36 to an accumulator 39.
It is connected to the. Indoor unit 60A, 60B, soC
Each has indoor heat exchangers 46A, 46B, and 46C1.
Indoor electric expansion valves 47A, 47B, 47C1 Indoor electric expansion valve controllers 49A, 49B, 49C1 that control the indoor electric expansion valves 47A, 47B, 47C1 Set room temperature detector 50A, soB, soc, intake air temperature detector 5
1A, 51B, 51C1 Indoor controller 61A, elB, elc, remote controller 54A, 5 having air conditioning load detectors 52A, 52B, 52C, etc.
Equipped with 4E and 54C.

The operation of the multi-room air conditioner configured as described above will be described below.

First, in the cooling operation, the high temperature and high pressure gas discharged from the variable capacity compressor 31 and the polar variable compressor 33, which are installed in parallel, is transferred to the outdoor heat exchanger via the oil separator 35 and the four-way valve 36. 37, condenses and liquefies and passes through the outdoor electric expansion valve 38 to each of the indoor units soA, eoB, so
The pressure is reduced by the indoor electric expansion valves 47A, 47B, and 47C of C, and evaporated and vaporized by the indoor heat exchangers 46A, 46B, and 46C. Return to 33. In the heating operation, the high-temperature, high-pressure gas refrigerant discharged from the variable capacity compressor 31 and the polar variable compressor 33 passes through the oil separator 35 and the four-way valve 36 to the indoor heat exchangers 4eA, 46B, 4.
8C, condenses and liquefies, and indoor electric expansion valves 47A, 47
B, 47C, the pressure is reduced by the outdoor electric expansion valve 38, evaporated by the outdoor heat exchanger 37, and returned to the variable capacity compressor 31 and polar variable compressor 33 via the four-way valve 36 and accumulator 39.

Next, capacity control and system control will be explained with reference to FIGS. 2 to 6. The capacity control of each compressor 31, 33 is performed according to the pressure detected by the pressure detector 41.

During cooling, the low pressure side pressure is detected and set to the predetermined low pressure, and during heating, the high pressure side pressure is detected.
EP11), so that the predetermined set high pressure is achieved,
Pressure difference calculation means 5 calculates the difference between the detected pressure and the set pressure.
Calculated in 5 5TEP12), predetermined double-sided reduction machine! The inverter 32 and the pole number switch 34 are controlled by a capacity change range determination and control means 56 that changes the combination steps of the capacity control combinations (Table 1) of 3j and 33 as shown in Table 1 according to the pressure difference. (STEP13.5TEP14)
.

! (Table 1) Pressure difference - capacity change width correspondence table for each indoor unit 45A
, 46B, 45C, indoor controller 6
0A, 60B, soC, the intake air temperature detectors 51A, 51B measure the intake air temperature.

Detected by S1C 5TEP21), remote control 54A, 5
4B.

Set each room temperature setting value set at 54C to be detected by room temperature detectors 50A, 50B, 6oc 5TEP
22) Air conditioning load calculators 52A and 52B calculate the air conditioning load from the room temperature set value and the intake air temperature.

52C 5TEP23), and the valve opening control width determining means 62A, 62B, 62C determine the control valve 5TEP26) according to the preset cooling and dehumidification operation mode.5TEP26) The valve opening change range determining means 57A, 57B determines the change range of the valve opening of the electric expansion valve as shown in Table 1.

cs7c (STEP 24), and controls the indoor electric expansion valve controllers 49A, 49B, and 49C (STEP 2).
5).

At this time, the indoor electric expansion valve control width is made smaller in the dehumidifying operation mode than in the cooling operation mode. or,
Since the heating operation is the same as the conventional one, the explanation will be omitted.

As described above, according to this embodiment, one outdoor unit equipped with two compressors and a plurality of indoor units are connected in parallel, and the capacity of the two compressors is controlled by pressure detectors. control based on
By having a configuration in which the valve opening control width of the indoor electric expansion valve of each indoor unit is smaller in the dehumidifying operation mode than in the cooling operation mode, the indoor electric expansion valve is smaller during the dehumidifying operation than during the cooling operation. Since the expansion valve is controlled to be slightly throttled5, the evaporation water level is low and the rate of latent heat exchange increases, resulting in a greater dehumidifying effect compared to lowering the room temperature, making dehumidifying operation possible. be able to.

Effects of the Invention As described above, the present invention connects one outdoor unit equipped with two compressors and a plurality of indoor units in parallel, and controls the capacity of the two compressors using a pressure detector. The valve opening control range of the indoor electric expansion valve of each indoor unit is smaller in the dehumidifying operation mode than in the cooling operation mode. Compared to normal conditions, the indoor electric expansion valve is controlled to be slightly throttled, which lowers the evaporation temperature and increases the rate of latent heat exchange, resulting in a greater dehumidifying effect compared to lowering the room temperature, making dehumidifying operation possible. .

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram of a multi-room air conditioner according to an embodiment of the present invention, Fig. 2 is a block diagram of the same, Fig. 3 is a flowchart of indoor electric expansion valve control of the indoor unit, and Fig. 4 is the 70-chart diagram of compression function power control of the same outdoor unit, No. 5
The figure is a flowchart of the outdoor electric expansion valve control of the outdoor unit, and Figure 6 is a refrigeration cycle diagram of a conventional multi-room air conditioner.
Figure 7 is a block diagram of the same, Figure 8 is a flowchart of the indoor electric expansion valve control of the indoor unit, Figure 9 is a flowchart of compressor oil output control of the outdoor unit, and Figure 10 is the outdoor unit of the outdoor unit. It is a flowchart figure of electric expansion valve control. 47...Indoor electric expansion valve, 49...Indoor electric expansion valve controller, 62...Valve opening control answer determining means. Agent's name: Patent attorney Toshio Nakao and one other person for 11 nights.
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Claims (1)

[Claims] One outdoor unit equipped with a compressor whose capacity can be varied by an inverter, a pole-change compressor, an oil separator, a four-way valve, an outdoor heat exchanger, an outdoor electric expansion valve, and an accumulator, an indoor electric expansion valve, and an indoor electric expansion valve. A plurality of indoor units, each equipped with a heat exchanger, are connected in parallel, and a pressure detector is installed in the piping (inside the outdoor unit) between the outdoor unit and the four-way valve, and the inverter frequency and An inverter that controls the number of poles, a pole number switcher, a refrigerant temperature detector that detects the refrigerant temperature in the piping between the indoor unit and the outdoor electric expansion valve, and an opening degree of the outdoor electric expansion valve is controlled according to the detected temperature. an outdoor electric expansion valve controller that detects air temperature, an air temperature sensor that detects the temperature of the intake air of the indoor unit,
A set room temperature detector that detects the room temperature set value of the indoor unit, an air conditioning load calculator that calculates from the detected intake air temperature and the room temperature set value, and an indoor electric controller that controls the opening degree of the indoor electric expansion valve according to the air conditioning load. A multi-room air conditioner comprising: an expansion valve controller, and a valve opening control range of each of the indoor electric expansion valves is smaller in a dehumidification operation mode than in a cooling operation mode.