JP3075880B2 - Air conditioner - Google Patents

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 a plurality of outdoor units are connected in parallel to piping between units extending from an indoor unit.

[0002]

2. Description of the Related Art In general, a plurality of indoor units are arranged in parallel, and a plurality of outdoor units including a compressor, an outdoor heat exchanger, etc. are connected in parallel to piping between units connected to each indoor unit. A multi-type air conditioner for a building to be connected is known (for example, see Japanese Patent Application Laid-Open No. 2-85).
656).

[0003] This type of multi-type air conditioner includes a plurality of outdoor units.
There is an advantage that a large capacity system of the device can be realized.

[0004]

By the way, in this air conditioner, as the outdoor unit, a fixed capacity type outdoor unit having a built-in fixed capacity type compressor and a variable capacity type (inverter type) compressor. It is common to use together with a variable capacity outdoor unit having a built-in. The total horsepower of both outdoor units determines the performance of the air conditioner. Here, in Japan, the power supply frequency is divided into a 50 Hz area and a 60 Hz area. The capacity of the outdoor unit of the variable capacity type described above is substantially constant regardless of whether it is operated in a 50 Hz area or in a 60 Hz area. However, the ability inevitably changes when the fixed-capacity outdoor unit is operated in the 50 Hz area and when it is operated in the 60 Hz area. For example, when an outdoor unit capable of exhibiting 10 horsepower at 60 Hz is operated at 50 Hz, the capacity is 8.3 (1).
0 × 5/6) to horsepower. As described above, when the same unit is used in a district having a different frequency, a difference occurs in the capacity of the unit, and the air conditioner cannot be operated with the horsepower requested by the customer. In order to solve such a problem, it is conceivable to separately design an outdoor unit of a fixed capacity type dedicated to 50 Hz and an outdoor unit of a fixed capacity type dedicated to 60 Hz. The cost increase was not distorted.

According to the present invention, an air conditioner in which an outdoor unit of a fixed capacity type and an outdoor unit of a variable capacity type are combined exhibits substantially the same performance regardless of the frequency (50 Hz, 60 Hz). The purpose is to satisfy customer requirements.

[0006]

In order to achieve this object, the present invention connects an outdoor unit of a constant capacity type and an outdoor unit of a variable capacity type to an inter-unit pipe extending from an indoor unit, and further comprises a power supply frequency. And a controller for correcting the difference in the operating ability of the constant-capacity outdoor unit caused by the difference with the operating ability of the variable-capacity outdoor unit. In addition, an auxiliary outdoor unit for compensating for a difference in operation performance between the outdoor units of the constant capacity type caused by a difference in the frequency of the power supply is provided.

[0007]

The function of the fixed capacity outdoor unit with the power supply frequency of 50 Hz is reduced by the variable capacity outdoor unit, so that the total capacity of the two outdoor units is 50 Hz and 60 Hz. It is kept almost constant.

[0008] In addition, when the power supply frequency is 50 Hz and the capacity of the fixed-capacity outdoor unit is reduced, the total capacity of these outdoor units is substantially constant both in the 50 Hz area and in the 60 Hz area by covering with the auxiliary outdoor unit. Is kept.

[0009]

In FIG. 1, reference numerals 1, 2, and 3 denote outdoor units, and a plurality of these outdoor units are connected by an oil equalizing pipe 4. The oil equalizing pipe is connected to the compressors 5, 6, 7 in the outdoor units 1, 2, 3, respectively. Here, the compressors 5 and 6 housed in the outdoor units 1 and 2 are fixed capacity compressors, and the compressor 7 housed in the outdoor unit 3 is a variable capacity (inverter) compressor. Of course, each of the outdoor units 1, 2, and 3 includes an outdoor heat exchanger (not shown).
Is an outdoor unit of a constant capacity type, and the outdoor unit 3 is an outdoor unit of a variable capacity type.

The number of connected outdoor units 1, 2 and 3 and the number of operating units are set according to the number of indoor units described later and the air conditioning load of the building. 8, 9, and 10 are indoor units. For example, the indoor unit 8 is installed on the third floor 12 of the building 11, the indoor unit 9 is installed on the second floor 13 of the building, and the indoor unit 10 is installed on the third floor 14 of the building. Note that the outdoor units 1, 2, 3 are arranged on the roof of the building 11. The indoor and outdoor units are connected by an inter-unit piping 15 as shown in FIG.

FIG. 2 shows the indoor and outdoor units 1 and 2 shown in FIG.
It is explanatory drawing which shows the connection state of wiring of 2, 3, 8 (the outdoor unit 9, 10 was abbreviate | omitted). Reference numeral 20 denotes a control box connected to these units, and reference numeral 21 denotes a remote control panel connected to the control box. Here, each unit 1, 2, 3, 8
The control box 20 and the remote control panel 21 are connected by eleven signal lines 23, respectively. The reason why the number of signal lines between the control box 20 and the remote control panel 21 is greater than the number of signal lines between each of the units 1, 2, 3, 8 and the control box 20 is as follows. This control box 20 is equipped with a microcomputer for central command,
The operation management of each of the outdoor units 1, 2, 3 is performed in accordance with the operation state and the request of each of the indoor units, so that the system of the air conditioner is appropriately maintained. In addition, the control box 20 has functions such as monitoring of the operating condition and abnormal state of the air conditioner, and output of collective operation / operation / alarm from the outside, etc., and aims to centralize services. Specifically, the functions of this control box are listed as the following ten.

(A) Serial processing: indoor / outdoor communication processing: (run / stop / cooling / heating / blowing / various data, etc.) (b) Horsepower calculation: calculation of required horsepower from indoor to outdoor (c) Horsepower distribution: Output horsepower to each outdoor unit (d) Oil / refrigerant control: oil level / refrigerant recovery control between outdoor units (e) Defrosting processing: Defrosting processing of outdoor units (f) Alarm processing: Alarm processing of indoor and outdoor units (G) External input: Batch operation / stop, cooling / heating switching, demand control (h) External output: Operation / stop, alarm (i) Monitor: Indoor / outdoor operation data monitor (j) Display: Operation, alarm, connection status Thus, in the control box 20, each indoor / outdoor unit 1,
A controller for controlling the operation of 2, 3, and 8 is built in, and the number of wires from the control box 20 to each of the indoor / outdoor units 1, 2, 3, and 8 is reduced as much as possible. As a result, if the control box 20 and the remote control panel 21 are brought as close as possible to each other, the wiring 22 connecting the control box 20 and each of the indoor / outdoor units 1, 2, 3, and 8 is a simple two-wire type. Therefore, the number of wirings 22 connecting these can be reduced as much as possible.

In FIG. 2, each indoor / outdoor unit 1,
Power cords 24 are provided for the power supplies 2, 3, 8, and the control box 20, respectively. here,
A controller 25 is housed in the control box 20. The controller 25 receives signals and power from the indoor units 8, 9, and 10 and outputs operation signals to the outdoor units 1, 2, and 3. Things. FIG. 3 shows a flowchart of the controller 25. For simplicity of description, the above-mentioned outdoor units 1 and 2 are of a constant capacity type capable of exhibiting a 10-horsepower capacity in a 60-Hz area (8.3-horsepower capacity in a 50-Hz area). It is set to a variable capacity type capable of exhibiting a capacity of 0 to 10 horsepower in both the 50 Hz and 60 Hz areas.

In FIG. 3, when the operation of the air conditioner is started in step 30, first, it is determined in step 31 whether the power supply frequency supplied to the control device 20 (the outdoor units 1, 2, 3) is 50 Hz or 60 Hz. Perform in. And 6
In the case of 0 Hz, the process proceeds to step 32, in which the horsepower A of the fixed capacity outdoor units 1 and 2 is set to 10. On the other hand, in the case of 50 Hz, the process proceeds to step 33, in which the capacity variable type is used. The horsepower B of the outdoor unit 3 is set to 8.3.

As described above, in steps 32 and 33, the horsepower of the outdoor unit 3 is changed (from 10 horsepower to 8.3 horsepower) according to the power supply frequency (at 50 Hz). 60H
In the case of z, in step 34, the sum D of the horsepower (10 horsepower = C) of the variable capacity outdoor unit 3 and the horsepower (10 horsepower = A) set in step 32 is obtained, and this value is set to 60H.
Determine the maximum capacity for z. Then, step 35
Then, the total of the required horsepower of the indoor units 8, 9, and 10 is compared with the sum D obtained in step 34, and the operation distribution of each outdoor unit is determined, for example, as shown in FIG. , 2 and 3 are operated. Thereafter, the operation status of each of the outdoor units 1, 2, 3 is changed based on FIG. 4 in accordance with the change in the required horsepower of each of the indoor units (step 30).

On the other hand, in the case of 50 Hz, in step 37, the sum F of the horsepower (10 horsepower) of the variable capacity outdoor unit and the horsepower (8.3 horsepower) set in step 33 is obtained. Then, in step 38, the indoor units 8, 9, 1
By comparing the sum of the required horsepower of 0 and the sum F obtained in step 37, the operation distribution of each of the outdoor units 1, 2, and 3 is determined as shown in FIG. , 3 are driven. Thereafter, the outdoor units 1, 2, 3, and 3 are changed according to the change in the required horsepower of each indoor unit.
Is changed based on FIG.

Here, comparing FIG. 4 and FIG.
When the capacity of the fixed capacity type outdoor units 1 and 2 is reduced at 50 Hz as compared with 0 Hz, the operation capacity of the variable capacity type outdoor unit 3 is adjusted to reduce the power supply frequency to 5 Hz.
A substantially constant capability can be set whether the frequency is 0 Hz or 60 Hz. In FIG. 2, reference numeral 50 denotes an auxiliary outdoor unit.
When the frequency of the power supply is 50 Hz, the outdoor unit 1
2 and 3 are connected in parallel. The auxiliary outdoor unit 50 has a capacity that is lower than that of the case where the frequency of the power supply is 60 Hz. Specifically, when the number of the outdoor units 1 is constant, the capacity is 1.7. Two horsepower-constant outdoor units (in the case of FIG. 2) have a horsepower of 3.4 horsepower. By adding the auxiliary outdoor unit 50 in this way, even in the 50 Hz area,
Even in the 0 Hz area, the variable capacity value of the variable capacity outdoor unit 3 can be unified.

[0018]

As described above, according to the present invention, the reduced performance of the fixed-capacity outdoor unit at the power supply frequency of 50 Hz is covered by the variable-capacity outdoor unit or the auxiliary outdoor unit. Therefore, even if the air conditioner is configured by connecting an outdoor unit of variable capacity type and an outdoor unit of constant capacity type in parallel, substantially the same performance can be exhibited regardless of the power supply frequency.

[Brief description of the drawings]

FIG. 1 is a piping connection diagram of an air conditioner of the present invention.

FIG. 2 is a wiring connection diagram of the device shown in FIG.

FIG. 3 is a flowchart of a controller 25 shown in FIG. 2;

FIG. 4 is an explanatory diagram showing an operation state of an outdoor unit when the device shown in FIG. 1 is operated at 60 Hz.

FIG. 5 is an explanatory diagram showing an operation state of the outdoor unit when the device shown in FIG. 1 is operated at 50 Hz.

[Explanation of symbols]

 1,2,3 Outdoor unit 8,9,10 Indoor unit 15 Unit piping 25 Controller 50 Auxiliary outdoor unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-27987 (JP, A) JP-A-4-54898 (JP, A) JP-A-2-85656 (JP, A) (58) Investigation Field (Int.Cl. ⁷ , DB name) F24F 11/02 102 F24F 11/02

Claims (2)

(57) [Claims] 1. An outdoor unit of a fixed capacity type and an outdoor unit of a variable capacity type are connected to a pipe between units extending from an indoor unit, and these outdoor units are connected to each other in accordance with an air conditioning load of a building in which these units are installed. In the air conditioner for adjusting the total operating capacity, a controller for correcting the difference in the operating capacity of the outdoor unit of the constant capacity type caused by the difference in the frequency of the supply power with the operating capacity of the outdoor unit of the variable capacity type. An air conditioner comprising: 2. A fixed-capacity outdoor unit and a variable-capacity outdoor unit are connected to a pipe between units extending from the indoor unit, and these outdoor units are connected to each other in accordance with the air-conditioning load of the building in which these units are installed. An air conditioner for adjusting a total operation capacity, comprising an auxiliary outdoor unit for compensating for a difference in operation capacity of the constant-capacity type outdoor unit caused by a difference in frequency of a power supply.