JPH03186134A - Control device for air-conditioner - Google Patents

Abstract

PURPOSE:To permit the control of power consumption and the simultaneous operation of all interconnected indoor devices by operating all the indoor devices simultaneously during peak-cut operation. CONSTITUTION:There are provided a peak-cut operation means A for effective a peak-cut operation in a time zone when an increase in power demand occurs and a control means B for effective such a control as to operate all indoor devices 2a-2c simultaneously during the peak-cut operation. The operation frequency of a compressor is reduced by the peak-cut operation means A, an appropriate check is made on the indoor devices 2a-2c to examine if there is any capable of offering a saving in capacity by the control means B and, if so, the capacity thereof is controlled against waste. This permits the control of power consumption and the simultaneous operation of all the interconnected indoor devices 2a-2c.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) This invention relates to an air JA1 machine 0 control system 2I.

[Conventional technology]

FIG. 5 of the drawing is a control block diagram showing a conventional multi-room air conditioner disclosed in Japanese Unexamined Patent Publication No. 61-205744 (hereinafter referred to as the conventional example). In FIG. 5 of the drawing, Y indicates a multi-room air conditioner. type air conditioner, l is an outdoor unit equipped with a compressor energized from a power source via a variable frequency inverter 10, 2a
, 2b, 2c are indoor units connected to outdoor unit 1, 3
a.

3b and 3c are indoor unit control circuits, 4 is an outdoor unit control circuit, 5a, 5b, and 5e are capacity setting switches, respectively.
6 is an auxiliary relay, 6a is a make contact, -ls, 7 is an outdoor unit fan control relay, 7b is a break contact, 8a, 8b,
8c, 9a, 9b, and 9c are electromagnetic valves, 11 is a compressor drive motor, 12 is an outdoor unit fan motor, and 13 is a four-way valve coil.

Next, the operation of this conventional example will be explained using FIG. 5. In FIG. 5 of the drawing, the indoor unit 2a.

Indoor unit control circuit 3a in each of 2b and 2c.

Operation commands from 3b and 3c and outdoor unit control circuit 4F.

ii) The operating frequency of the variable frequency inverter 10 connected to the compressor drive motor 11 is determined in the outdoor unit control circuit 4 based on the capacity code and the harshness conditions set by the capacity setting switches 5a, 5b, and 5e. Calculation and outdoor unit fan motor 12. Four-way brake coil 13 and electromagnetic brake i8a
, 8b, 8c, 9a.

The respective operating states of 9b and 9e are determined according to a certain sequence, and the outdoor unit 1 is operated and the indoor unit is operated.

Here, the total capacity of each indoor unit is selected to be a total capacity that is somewhat larger than the maximum permissible zero power determined by the maximum capacity of the outdoor unit, and the total capacity of the capacity indoor units to be operated is -I- A control stage is provided to control the temperature below the maximum permissible capacity.

The first stage of control that controls the sum of the capacities of each indoor unit to below the maximum allowable capacity is to The operation of each indoor unit shall be started in sequence according to the above, and when the operation of each of these indoor units is started, only when the sum of the operating capacities of the indoor units currently in operation plus the capacity of the indoor unit starting operation is less than or equal to the maximum allowable capacity. , the conventional air conditioner control method allows the indoor unit to start operating.

(Problem to be Solved by the Invention) Since the conventional control device for a multi-room air conditioner is configured as described above, each indoor unit has its own maximum permissible 0 heat.
When one indoor unit is combined and operated simultaneously, there are problems such as simultaneous operation is not possible even under light loads, and peak cut operation is not possible to cut the peak when the power demand increases.

This invention was made to solve the above-mentioned problems, and it reduces the human power required for air conditioners by 51 meters and eliminates 1! To obtain a multi-room air conditioner that can perform power control and simultaneously operate all connected indoor units, and to select an indoor unit for peak cutting each time based on indoor air conditions and indoor temperature settings. The purpose is to obtain a control device for the machine.

In addition, voltage detection [01
By configuring the device to use a current detection circuit used for detecting overcurrent and overcurrent, the device can be made inexpensive, and by cutting power peaks, it is possible to reduce the increase in power consumption, save energy, and continue to provide comfortable air conditioning. 1 target.

[Means to solve the problem]

Therefore, in the present invention, a multi-room air conditioner is provided that uses an outdoor unit equipped with a compressor that is energized from a power source via a variable frequency inverter, and a plurality of indoor units connected to the outdoor unit. an air conditioner, comprising: a peak cut operation means for performing a peak cut operation during a time period when power demand increases; and a control means for controlling all indoor units to operate simultaneously during the peak cut operation. The aim is to achieve the above-mentioned [1] by means of a control device for a harmonizer.

Further, in the above invention, the power detection means is provided, the peak cut operation means lowers the compressor operating frequency, the control means appropriately determines an indoor unit whose capacity can be saved, and the capacity of the indoor unit is saved. The purpose of the present invention is to achieve the above object by using a control device for an air conditioner.

[Effect]

The control device for an air conditioner according to the present invention uses a peak cut operation means to perform peak cut operation during a time period when power demand increases, and during the peak cut operation, all indoor units are operated simultaneously by the control means.

Further, in the above invention, the compressor operating frequency is lowered by the peak cut operation means, the control means appropriately determines an indoor unit whose capacity can be saved, and the capacity of the indoor unit is saved.

〔Example〕

Hereinafter, two embodiments of the present invention will be described based on the drawings.

FIG. 1 is a control block diagram of the first embodiment of the present invention;
Figure 2 is a time chart showing the operation of the first embodiment;
The figure shows a control block diagram of the second embodiment of the present invention, and figure Z4 is a time chart showing the operation of the second embodiment. In the figure, the circuit or phase j components in the conventional example are represented by the same reference numerals 4J, and redundant explanation will be omitted.

Now, a first embodiment of the present invention will be explained using drawings 1 and 2.

] In Figure 1, A is a 1-stage peak cut operation, which is composed of an outdoor control circuit 4, and is a 4-stage peak cut operation when power demand increases. 1
No. 0 has a II variable frequency inverter, and is composed of a automatic module 101, a power transistor 102, a toggle capacitor 103, Mj, and a current detection resistor 104. Reference numerals 5a, 5b, and 5c are capacity setting switches, each of which also has a priority cutoff setting function. Reference numeral B designates a control stage 0IT-stage which controls the main indoor units to operate simultaneously during peak cut operation, and is constituted by the outdoor control circuit 4.

FIG. 2 is a time chart showing the operation during power detection feedback of the first embodiment. In Figure 2, a is the capacity of the indoor units 2a, 2b, and 2e, b is the frequency (It), e is the bus voltage (V), and d is the current (
A), e indicates each operation of input power (W), 21 is frequency, 22 is I+) line voltage, 23 is current,
24 shows each change in human power.

Next, the operation of the first embodiment will be explained using FIG. 1 and FIG. 2 of the cabinet.

In FIG. 1 and FIG. 2C, indoor units 2a, 2b,
The outdoor unit control circuit 4 that receives the operation command from the indoor unit 2c calculates the compressor operating frequency, and the compressor operating frequency 21 (Fig. 2) increases by 1 according to the operating indoor unit. The current 23 increases and C) a! i! The voltage 22 decreases, and the human power 24 calculated by combining the bus voltage and current increases. Then, when the peak force level set in the fth outdoor control r111 path 4 is exceeded (point U), the operating frequency 21 is lowered and the electric power 24 is suppressed. For example, when the priority ships Iq are arranged in the order of indoor units 2a, 2b, and 2c, the capacity reduction due to lowering the operating frequency will reduce the capacity of the indoor unit 2C, which has a lower priority.

In the first embodiment, human power is detected using an inverter! 0
Line current 11. C (power 7fl across the current detection resistor 104 and straight wire 7jtJL V oc (power LE across the double capacitor 103), but human power detection can also be detected at the input end of the inverter IO. good.

Next, FIGS. 3 and 41 show a second embodiment of the present invention.
This will be explained using Nu1.

In Figure 3, the difference from Figure 1 with +1η is as follows:
This is because an external setting device 14, which is a peak cut operation means A, is provided, and this external setting device 14 receives a peak cut command from the outside and adjusts the settings from the respective set temperatures of the indoor units 2a, 2b, and 2c and the indoor temperature. This is a device IT that determines the indoor unit capable of capacity saving and the peak cut level, and transmits it to the outdoor control 1j+] path 4. Other configurations are as described above.
Since this is the same as the embodiment, repeated explanation will be omitted.

FIG. 4 is a time chart showing the operation of the second embodiment. In Figure 4 of the drawing, a indicates indoor units 2a, 2b, 2
c indicates each operating state, b indicates frequency (11□), e indicates each operation of human power (W), 21 indicates indoor unit 2
a and 22 indicate the time charts of the indoor unit 2b, 23 the indoor unit 2C, 524 the output frequency of the inverter 10 connected to the compressor drive motor 11, and 25 the human power of the outdoor unit 1, respectively. Further, the symbol L indicates an external setting condition, ■ indicates no condition, ■ indicates peak cut %, capacity saving indoor unit 2C1■ indicates peak cut %, and capacity saving indoor unit 2b.

2C1■ indicates each condition without peak cut.

Next, the operation of the second embodiment will be explained using FIGS. 3 and 4.

In the drawings Fig. 3 and Fig. 4 C, in the case of normal operation,
The operating frequency of the compressor is determined by the outdoor control circuit 4 in accordance with the operating commands from the indoor units 2a, 2b, and 2c, and the capacity of the outdoor unit 1 is controlled (symbol ■).

Next (, external setting device 14 &: When a peak cut command is received, the external setting device 14 determines the indoor unit and peak cut level that can be saved + i (capacity save + i) from the set temperature of indoor #%2a2b, 2e and the indoor temperature, Outdoor 1) An alarm is sent to the control circuit 4. In the outdoor control circuit 4, it is
The reduced R operating frequency and the operating state of the indoor unit are controlled until the human power falls below the peak cut level. In this case, note '-J-■, the capacity is saved by taking the peak cut of indoor unit 2c as %, and in 18/10, indoor unit 2b,
Both 2e saves ability by using peak cut as station.

When the peak cut command is released, the state returns to the original state (symbol ■).

At this time, the human power as the power detection f-stage C is the voltage/fVoc and rf at both ends of the P-sliding capacitor 103.
It can be determined by hl of mJ'E at the inner end of the tft resistor 104.

In the above embodiment, the external setting device 14 as the peak cut operation means A is used to set the capacity saving indoor unit to
However, t11 may be determined by the outdoor control circuit 4 as in the first embodiment described above.

Further, in the embodiment described above, the external setting device 14 is operated as a middle type, but it may be operated in conjunction with the building management system.

As shown below, in the first and second embodiments, a voltage detection circuit and an overcurrent detection circuit that use power detection for output voltage control are used.
Since the device is configured to use the current detection circuit used for t1, the device can be made inexpensive, and by cutting power peaks, it is possible to prevent an increase in power consumption and continue to provide comfortable air conditioning while contributing to energy conservation.

〔Effect of the invention〕

As described above, according to the present invention, the human power of the air conditioner can be measured, consumed, and controlled by the user, and all connected indoor units can be operated simultaneously. This has the effect of reducing the harmonizer by 1il. Further, there is an effect that an air conditioner control device can be obtained that can arbitrarily select the target indoor unit for peak cutting based on the indoor air condition and indoor temperature setting each time.

In addition, since the power detection uses a voltage detection circuit for output voltage control and a current detection circuit for overcurrent detection, the installation can be made as cheap as 2 tons, and power peak cutting prevents increases in power consumption and contributes to energy savings while providing comfort. This has the effect of allowing continuous air conditioning.

[Brief explanation of drawings]

FIG. 1 is a control block diagram of the first embodiment of the present invention;
Figure 2 is a time chart showing the operation of the first embodiment;
FIG. 4 is a control block diagram of a second embodiment of the present invention, FIG. 4 is a time chart showing the operation of the second embodiment, and FIG. 5 is a control block diagram of a conventional multi-room air conditioner. Y...Multi-room air conditioner A--Peak cut operation means B--Control means C--Power detection means! ...Outdoor units 2a, 2b, 2cm---Indoor unit 4---Outdoor control circuit 5a, 5b, 5c=---"Capacity setting switch 6---Auxiliary relay 10... Inverter 14... External setting device In the figure, Dochiku Σ corresponds to the same or equivalent part.

Claims (2)

[Claims] (1) In a multi-room air conditioner that has an outdoor unit equipped with a compressor powered by a power source via a variable frequency inverter, and multiple indoor units connected to the outdoor unit, An air conditioning system characterized by comprising: a peak cut operation means for performing peak cut operation during peak cut hours; and a control means for controlling all the indoor units to operate simultaneously during the peak cut operation. Machine control device. (2) Provide power detection means and use peak cut operation means,
2. The air conditioner control device according to claim 1, wherein the compressor operating frequency is lowered, the control means appropriately determines an indoor unit whose capacity can be saved, and the capacity of the indoor unit is saved.