JPS63295880A - Multi-chamber type air conditioner - Google Patents

Abstract

PURPOSE:To enhance operation efficiency by forming a refrigerant cycle with a smaller capacity compressor capable of 2-stage capacity control and a larger capacity compressor and numerically specifying a capacity ratio. CONSTITUTION:Refrigerant from a smaller capacity 1st compressor 1 capable of changing its number of poles and a larger capacity 2nd compressor 2 capable of changing its number of poles forming a refrigerant cycle is sent to indoor cycles 8a-8d. Specifying the capacity ratio between both of the compressors 1 and 2 to be 2:3 and start-stop controlling the both compressors 1 and 2, the number of stages of capacity control is made to be 8. As a result, an outdoor unit of an operation capacity commensurate with that of the indoor unit can be arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a multi-room air conditioner in which a plurality of indoor units are connected and each is operated individually, and more particularly to capacity control of the outdoor units.

BACKGROUND OF THE INVENTION In recent years, it has become necessary for multi-room air conditioners to connect a plurality of indoor units with different horsepower and to be able to operate each unit individually.

Therefore, it is necessary to match the capacity of the outdoor unit to the operating capacity of the indoor unit, and the following method is usually implemented.

A. Multi-stage capacity control using an inverter compressor. B: Two-stage capacity control using a pole conversion compressor, an unload compressor, and two compressors.

Problems to be Solved by the Invention However, in the above configuration, in case A, there is a problem that the cost of the inverter is high, and in case B, although the cost is low, there are fewer capacity control steps. However, there was a problem in that the capacity of the outdoor unit could not be adjusted to match the operating capacity of the indoor unit, resulting in an inefficient system with little energy saving effect. -To solve this problem, for example, a method of using two pole conversion compressors may be considered, but
Despite the complicated control as shown in Table 1, the i-hika control is 4.
Stage (100'!lr, 76%, 50%, 25%)
There was a problem that could only be solved.

Table 1 In view of the above problems, the present invention provides a multi-room air conditioner that has a simple configuration and connects an outdoor unit with many capacity control steps and a plurality of indoor units of different horsepower that can be operated individually.

Means for Solving the Problems In order to solve the above-mentioned problems, the multi-room air conditioner of the present invention has two stages of capacity control (e.g., power conversion and unloading system). An outdoor unit with one compressor, a second compressor with a large capacity, an outdoor heat exchanger, etc., and a plurality of indoor units each with this outdoor unit and an indoor heat exchanger, etc. are connected to one gas side. The main piping and the main piping on the plate side communicate with each other, and the first compressor and the second compressor have a total capacity ratio of 2:3.

Operation According to the present invention, with the above-described configuration, the number of performance control stages of the outdoor unit is increased to 8 stages as shown in Table 2, and the outdoor unit can be used as an outdoor unit depending on the operating performance of the indoor unit.

EXAMPLE Hereinafter, a multi-room air conditioner according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a refrigerant cycle diagram in an embodiment of the present invention. In the figure, 1 is a first compressor having a small capacity and capable of changing the number of poles, and the capacity can be controlled at 4) P and 2W. 2 is a second compressor with a large capacity and capable of changing the number of poles, and the capacity can be controlled between 6)P and 3HP.

3a and 3b are check valves for preventing refrigerant from stagnation in the compressor on the stopped side when one of the first compressor 1 or the second compressor 2 is operating and the other is stopped; 4 is an outdoor heat exchanger 6 is an accumulator, and 6 is an oil equalizing pipe that equalizes the level of refrigerating machine oil in the first compressor 1 and the second compressor 2, and these are housed in an outdoor unit 7.

8a, sb, sc, and ad are indoor units, each of which is an indoor pressure reducing device 9a having a fully closing function.

9b, 90, 9d and indoor heat exchangers 10a, 10b.

It has 1oC21od.

Here, the indoor units 8a and 8c have a capacity of 3H1+, and the indoor units 8a and J3d have a capacity of 2)P.

Moreover, this indoor unit 8a, sb, ac,
ad and the outdoor unit 7 are connected to a gas side main pipe 11, a plate side main pipe 12, and a gas side branch pipe 11 branched from the gas side main pipe 11.
a, 11b, 11c, 11d and plate side branch pipes 12a, 12
b, 12c, and 12d.

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

The refrigerant discharged from the first compressor 1 and the second compressor 2 passes through the check valves 3a and 3b and is sent to the outdoor heat exchanger 4, where it is condensed and liquefied. 12a, 12b,
Indoor units aa, sb, ac through 12c and 12d
, sent to sd.

Here, the indoor pressure reducing devices 9a, 9b, 9c, and 9d reduce the pressure appropriately, and the indoor heat exchangers 10a, 10b+10c, 10
d, it is evaporatively cooled and gasified, and the gas side branch pipes 11a, 1
1b, 11c, 1-+d, and the gas side main side pipe 11 are sent to the outdoor unit 7, and circulated from Achiemure Taro to the first compressor 1 and the second compressor.

Here, for example, if the indoor unit 8a, which has a capacity of 3P, stops operating, the indoor operating capacity becomes 70%,
6) The number of poles of the second compressor 2 having a capacity of P is changed from 2 to 4 to reduce the capacity of the second compressor 2 by half. The capacity of the subordinate outdoor unit and door will be 70% of 7) P, which will match the indoor operation capacity and the capacity of the outdoor unit 7. Below is a pattern of each indoor operating capacity, the first compressor 1 and the second compressor 2.
This shows the driving pattern.

Table 3 As described above, according to this embodiment, the capacity ratio of the first compressor and the second compressor, which are capable of converting between two poles and four poles, is 2:3 (4W at 2 poles vs. 61P, 2H' at 4 poles vs. 3EP at 4 poles). ), the capacity control stage becomes 8 stages, multiple indoor units can be operated individually, and even if the operating capacity changes, the capacity of the outdoor unit can be easily matched to the operating capacity of the indoor unit. Therefore, the refrigerant system is simplified, and the refrigerant system is always operated efficiently, resulting in a large energy-saving effect.

Effects of the Invention As described above, the present invention includes a plurality of indoor units, an outdoor unit each having a first compressor with a small capacity and a second compressor with a large capacity, each of which enables two-stage capacity control.
The outdoor unit and the indoor unit are connected through one gas side main pipe, and the capacity ratio of the first compressor and the second compressor is approximately 2:3. Even if a plurality of indoor units with multiple horsepower are individually operated, the capacity of the outdoor unit can be set to match the operating capacity of the indoor unit. Therefore,
The simple configuration allows efficient operation at all times, resulting in greater energy savings and lower costs.

[Brief explanation of the drawing]

The figure is a refrigerant cycle diagram of a multi-room air conditioner according to an embodiment of the present invention. 1...First compressor, 2...Second compressor, 4...Outdoor heat converter, 7...Outdoor unit, 8a, 9b. a c , s d =----indoor unit, 10a
, 1ob. 1oc, 1od... Heat converter on the curved chamber side, 11... Main piping on the mountain bus side, 12... Main piping on the liquid side. Name of agent: Patent attorney Toshio Nakao and one other person
・Spear! Pressure am 7-"Outdoor unit &, B8.8c, &i-Indoor unit IOa, 10LIOc, JOcl -11121 down BR
Chihiro n = z side main piping 12-liquid @ main piping

Claims (1)

[Claims] A plurality of indoor units each having an indoor heat exchanger, etc., a first compressor with a small capacity and a second compressor with a large capacity, each capable of two-stage capacity control, and an outdoor unit with an outdoor heat exchanger, etc. The outdoor unit and the indoor unit are connected through one gas side main pipe and one liquid side main pipe, respectively, and the capacity ratio of the first compressor and the second compressor is approximately 2:3. Shape air conditioner.