JPH06347085A - Air conditioner power connection structure - Google Patents

Abstract

PURPOSE:To enable connection to a multiple air-conditioner, without providing two kinds of commercial power sources, by a method wherein two phases, between which the unbalanced rate of equipment is not beyond a preset value, are selected out of multiple phases for the commercial power source and are connected to indoor machines. CONSTITUTION:Three indoor fans 7, 11, 15 each are connected to a terminal S and a terminal T of a 3 phase, 200 volt, commercial power source and three indoor fans 9, 13, 17 each are connected to a terminal R and the terminal T thereof. In this case, the unbalanced rate of equipment at the time when all of the indoor fans are driven is, for example, 4%. When the indoor fans 7, 11, 15 connected to the terminal S and the terminal T of the 3 phase, 200 volt, commercial power source are driven, the unbalanced rate of the equipment is, for example, 13.7%. When the indoor fans 9, 13, 17 connected to the terminal R and the terminal T are driven, the unbalanced rate of the equipment is, for example, 13.7%. In short, the inside fans are connected to the terminals S, T and to the terminals R, T in order that the unbalanced rate of the equipment is not beyond a fixed value of, for example, 30%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply connection structure for an air conditioner which simultaneously connects an outdoor unit with a relatively high load and an indoor unit with a relatively low load to a three-phase commercial power source, for example.

[0002]

2. Description of the Related Art Generally, a multi-type air conditioner in which a plurality of indoor units are connected in parallel to an outdoor unit is known. In this type, conventionally, an outdoor unit having a relatively high load is connected to a three-phase commercial power source, and an indoor unit having a relatively low load is connected to a single-phase commercial power source.

A simple illustration of this is shown in FIG. 2. The outdoor unit compressor 101 is connected to a three-phase 200V commercial power source, and the plurality of indoor fans 107 to 117 are connected to a single-phase 200V commercial power source. Connected. The two blowers 103 and 105 of the outdoor unit are connected to the R and S terminals of a three-phase 200V commercial power source.

[0004]

However, according to the conventional power source connection structure, a single-phase 200V commercial power source and a three-phase 200V commercial power source are required, and two types of power sources are used in a building or a home. There is a problem that you have to have.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technique and to provide a power supply connection structure capable of connecting multi-type air conditioners without having two types of power supplies. It is in.

[0006]

In order to achieve the above object, the present invention provides a multi-phase air conditioner power supply connection structure in which a plurality of indoor units are connected in parallel to the outdoor unit, and a multi-phase connecting to the outdoor unit. From each phase of the commercial power source, a phase in which the equipment unbalance ratio between the phases does not exceed a preset value is selected, and the indoor unit is connected to each phase.

[0007]

According to the present invention, first, a multi-phase commercial power source is connected to an outdoor unit, and from among the phases of this multi-phase commercial power source, the phase in which the equipment unbalance ratio between the phases does not exceed a preset value is selected. Selected,
Then, the indoor unit is connected to this selected phase. Therefore, the equipment unbalance rate between each phase is less than a predetermined value (a value that does not cause inconvenience) compared with the case where one of the phases of the multi-phase commercial power supply is selected and the indoor unit is simply connected to it. It can be suppressed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the power supply connection structure for an air conditioner according to the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 1 denotes an outdoor compressor. This compressor 1 is connected to a three-phase 200V commercial power source, and outdoor blowers 3 and 5 are connected to the R terminal and S terminal of this three-phase 200V commercial power source. The power consumption of the compressor 1 and the outdoor fans 3 and 5 is, for example, 5.77 KW as a whole, and the power consumption of the outdoor fans 3 and 5 is 0.2 KW, for example.

Further, as will be described later, a plurality of indoor blowers 7 to 17 are connected to the three-phase 200V commercial power source so as to suppress the unbalance rate of the equipment. Indoor blower 7
Each of the power consumptions of -17 is 0.092 KW.

A connection structure for connecting the above-mentioned indoor blowers 7, 9, 11, 13, 15, 17 to a three-phase 200V commercial power source will be described below.

That is, the three indoor blowers 7, 11, 15
Is connected to the S terminal and T terminal of a three-phase 200V commercial power source, and the three indoor blowers 9, 13, 17 are connected to the R terminal and T terminal.
It is connected to the terminal.

The unbalance rate of the equipment in this case will be calculated.

For example, in [SAH-CM1252V3, trial calculation of equipment unbalance rate depending on how to power the indoor unit]
When calculated based on, the unbalance rate of the equipment when driving all the loads (indoor blower) is (0.092 × 3-0.2) ÷ ((5.77 + 0.09
2 × 3) ÷ 3) = 0.04 (= 4%).

When the loads (indoor blowers) 7, 11 and 15 connected to the S and T phases of the three-phase 200V commercial power source are driven, the unbalance rate of the equipment is (0.092 × 3-0). ) ÷ ((5.77 + 0.092 ×
3) / 3) = 0.137 (= 13.7%).

The unbalance rate of the equipment when the loads (indoor / indoor units) 9, 13 and 17 connected to the R phase and the T phase are driven is the same as above (0.092 × 3 −0) ÷ ((5.77 + 0.092 ×
3) / 3) = 0.137 (= 13.7%).

In short, according to this embodiment, S is set so that the unbalance rate of the equipment does not exceed a predetermined value (for example, 30%).
The fan is connected to the phase and the T phase, and the R and the T phase,
According to this, the unbalance rate of the equipment can be significantly improved.

Incidentally, in the conventional connection structure (FIG. 2),
Assuming that the power consumption of various devices is equal to that of Fig. 1,
The equipment unbalance rate is (0.552-0) ÷ ((5.77 + 0.552) ÷
3) = 0.26 (= 26%), which is a value close to a predetermined value (for example, 30%).

Usually, when taking out a single-phase power source from a three-phase power source, it is a condition that the unbalance rate of the equipment does not exceed 30% (External Regulations 150-1 edited by the Japan Electric Association). Then, although it is difficult to satisfy this condition in the conventional structure, it can be sufficiently satisfied in this embodiment.

Although the present invention has been described above based on the embodiment, the present invention is not limited to this. That is, the present invention is applicable to multi-phase commercial power sources other than three-phase,
Applicable.

[0021]

As described above, according to the present invention,
From each phase of the multi-phase commercial power supply, select the phase where the equipment unbalance ratio between each phase does not exceed the preset value, and connect the indoor unit to this phase, so from the three-phase power supply to the single-phase power supply Even if it is taken out, the unbalance rate of the equipment can be kept low.

[Brief description of drawings]

FIG. 1 is a diagram showing a power supply connection structure of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a diagram showing a power supply connection structure of an air conditioner according to a conventional technique.

[Explanation of symbols]

 1 Compressor 3,5 Outdoor blower 7,9,11,13,15,17 Indoor blower

Claims (1)

[Claims] 1. In a power supply connection structure of a multi-type air conditioner in which a plurality of indoor units are connected in parallel to an outdoor unit, a facility imbalance ratio between each phase of a multi-phase commercial power source connected to the outdoor unit. Is selected so that the phase does not exceed a preset value, and the indoor unit is connected to each of these phases.