JPH05215416A - Air conditioner - Google Patents

Abstract

PURPOSE:To obtain a very efficient air conditioner in which the output from an inverter has optimum voltage-frequency characteristics constantly according to the output from a refrigerant flow rate detector and to the frequency command, and noise and vibration can be reduced. CONSTITUTION:The title air conditioner is formed of a compressor 1, a refrigerant flow rate detector 19 to detect flow rate of refrigerant in a refrigerant circuit, a wave form memory 20 to store waveform patterns of different voltage- frequency characteristics, and a waveform generator 21 which takes in the waveform pattern of an optimum voltage-frequency characteristics based on a signal from the refrigerant flow rate detector 19 from the waveform memory 20, generates a waveform, and outputs it to the interver 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner equipped with an inverter device for controlling the rotation speed of a compressor.

[0002]

2. Description of the Related Art In recent years, an air conditioner has been used which controls the capacity by increasing or decreasing the number of revolutions of a compressor by using an inverter device which makes a frequency of a power source variable.

As a conventional technique, for example, Japanese Patent Laid-Open No. Sho 60
There is Japanese Patent No. 232446. An example of the above-mentioned air conditioner will be described below with reference to the drawings.

FIG. 5 is a schematic configuration diagram of a conventional air conditioner. In FIG. 5, 1 is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is a decompression device, 5 is an outdoor heat exchanger, and these are connected in an annular shape to form a refrigeration circuit.

Reference numeral 6 is an indoor blower, and 7 is an outdoor blower. A room temperature sensor 8 detects the room temperature. 9
Is a room temperature setting device for setting the room temperature.

An indoor control circuit 10 receives the output signals of the room temperature sensor 8 and the room temperature setting device 9.

Reference numeral 11 denotes a frequency command section, to which the frequency control signal output from the indoor control circuit 10 is input. Reference numeral 12 denotes a waveform storage device, which has two types of voltages for cooling and heating.
The waveform pattern of frequency characteristics is stored.

A cooling / heating detecting device 23 outputs a signal "0" during cooling and a signal "1" during heating.

Reference numeral 13 is a waveform generator, which takes in a cooling-time waveform pattern from the waveform storage device 12 when the output of the cooling / heating detecting device 23 is "0", and when the output of the cooling / heating detecting device 23 is "1". The heating-time waveform pattern is fetched from the waveform storage device 12, a waveform is generated, and a waveform signal is output.

Reference numeral 14 denotes a base drive circuit, to which a waveform signal of a preset output of voltage-frequency characteristics in each waveform pattern of the waveform generator 13 during cooling and heating is input.

Reference numeral 15 is an inverter main circuit, which takes in the waveform signal amplified by the base drive circuit 14,
Control the compressor 1.

Reference numeral 16 is an indoor unit, and 17 is an outdoor unit. Reference numeral 18 denotes an inverter device, which includes a base drive circuit 14 and an inverter main circuit 15.

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

During the operation of the air conditioner, the waveform generator 13 takes in the waveform pattern of the voltage-frequency characteristic during the cooling operation from the waveform storage device 12 during the cooling operation and the voltage-frequency characteristic during the heating operation during the heating operation. Capture the waveform pattern,
A waveform is generated and input to the base drive circuit 14.

The input waveform is the base drive circuit 14
Through, is transmitted to the inverter main circuit 15, is amplified, and controls the compressor 1.

[0016]

However, in the above-mentioned configuration, the inverter device 18 outputs only the inverter waveform having two kinds of voltage-frequency characteristics during cooling and heating.

Therefore, when the load of the compressor 1 increases or decreases due to a change in the load condition of the air conditioner during cooling or heating, the output voltage of the inverter device 18 increases or decreases, and the compressor 1 has an optimum voltage-frequency characteristic. And the efficiency of the air conditioner deteriorates.

In view of the above problems, the present invention always maintains the optimum voltage-frequency characteristic for the compressor regardless of whether the load of the air conditioner changes due to a change in the load state of the air conditioner, whether during cooling or heating. In addition, an efficient air conditioner is provided.

[0019]

In order to achieve this object, an air conditioner of the present invention comprises a compressor whose rotation is controlled by an inverter device, and a refrigerant flow rate detecting device for detecting the flow rate of the refrigerant flowing through a refrigeration circuit. , A waveform storage device that stores waveform patterns of different voltage-frequency characteristics, and an inverter that generates a waveform by capturing a waveform pattern of an optimum voltage-frequency characteristic from the waveform storage device according to a signal from the refrigerant flow rate detection device. It is composed of a waveform generator for outputting to the device.

[0020]

According to the present invention, the refrigerant flow rate detection device having the above-described configuration detects the flow rate of the refrigerant flowing through the refrigeration circuit, and when the flow rate of the refrigerant flowing through the refrigeration circuit increases or decreases due to a change in the load condition of the air conditioner, the refrigerant flow rate detection device. The waveform generator takes in the output of the waveform storage device which stores the waveform pattern of the optimum voltage-frequency characteristic from the waveform storage device, and generates and outputs the waveform signal.

The output waveform signal is transmitted to the main inverter circuit through the base drive circuit and amplified to become the output of the inverter device. Even if the refrigerant flow rate increases or decreases, the output of the inverter device always maintains the optimum voltage-frequency characteristic. To do. Therefore, an efficient air conditioner can be realized.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An air conditioner according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an air conditioner in one embodiment of the present invention. In FIG. 1, 1 is a compressor,
2 is a four-way valve, 3 is an indoor heat exchanger, 4 is a pressure reducing device, 5 is an outdoor heat exchanger, 6 is an indoor blower, 7 is an outdoor blower, 8 is a room temperature sensor, 9 is a room temperature setting device, 10 is an indoor control circuit, 11
Is a frequency control unit, 14 is a base drive circuit, 15 is an inverter main circuit, 16 is an indoor unit, and 18 is an inverter device. The above is the same as the conventional configuration in FIG.

Reference numeral 19 denotes a refrigerant flow rate detecting device, which is divided according to the refrigerant flow rate-frequency characteristic as shown in FIG.
Three zones B and C are stored, and depending on the output of the refrigerant flow rate detection device 19 and the frequency command value of the frequency command unit 11, the refrigerant flow rate and the frequency command value at that time are in which zones A, B and C. Then, the signals A, B, and C are output. Reference numeral 20 denotes a waveform storage device, and as shown in FIG. 3, three voltage-frequency characteristic waveform patterns A ′, B ′,
Remember C '.

Reference numeral 21 denotes a waveform generator, which outputs a waveform pattern A'if the output of the refrigerant flow rate detector 19 is the signal A, a waveform pattern B'if the signal B, and a waveform pattern C'if the signal C. It is further captured, a waveform is generated, and a waveform signal is output to the base drive circuit 14. Also,
22 is an outdoor unit.

The operation of the air conditioner configured as described above will be described below with reference to FIGS. 1, 2, 3, and 4. FIG. 4 is a flowchart showing the operation of the waveform generator 21.

First, the operation of the waveform generator 21 will be described with reference to FIG. The operation of the compressor 1 is started (step 1). A signal from the refrigerant flow rate detection device 19 is fetched (step 2).

It is judged whether the fetched signal is "A" (step 3). If the signal is "A", the waveform pattern "A '" stored in the waveform storage device 20 is fetched (step 4).

If the signal is not "A", it is determined whether the signal is "B" (step 5). If the signal is "B", the waveform pattern stored in the waveform storage device 20 is "
B '"is taken in (step 6).

If the signal is not "B", the waveform storage device 2
The waveform pattern "C '" stored in 0 is fetched (step 7). A waveform signal is generated according to the waveform pattern acquired in step 4, step 6 or step 7 (step 8). A waveform signal is generated (step 9).

The waveform signal output from the waveform generator 21 by the above flow is transmitted to the inverter main circuit 15 through the base drive circuit 14. The inverter main circuit 15 amplifies the input waveform signal and outputs a three-phase inverter waveform to control the compressor 1.

As shown in FIG. 3, the voltage-frequency characteristics of the waveform patterns A ', B', and C'stored in the waveform storage device 20 indicate the load of the compressor 1 depending on the operating state of the indoor unit 16. The optimum voltage-frequency characteristic is obtained by raising or lowering the output voltage of the inverter device 18 according to the increase or decrease.

Therefore, the compressor 1 is always operated with the optimum voltage-frequency characteristic regardless of the increase or decrease of the load.

As described above, according to this embodiment, the indoor unit 1
Even if the refrigerant flow rate fluctuates due to the operating state of No. 6, the waveform generator 21 receives a waveform pattern of the optimum voltage-frequency characteristic according to the load from the waveform storage device 20 by the signal from the refrigerant flow detector 19 and outputs the waveform. To generate and output,
The compressor 1 is always operated with the optimum voltage-frequency characteristic regardless of the load increase / decrease.

As a result, the input current of the compressor 1 is reduced, the capacity and size of the inverter device 18 can be reduced, and the noise and vibration of the compressor 1 can be reduced.

Therefore, the efficiency of the air conditioner and the reduction of noise and vibration can be realized.

[0037]

As described above, according to the present invention, the compressor whose rotation speed is controlled by the inverter device, the refrigerant flow rate detection device for detecting the flow rate of the refrigerant flowing in the refrigeration circuit, and the waveforms of different voltage-frequency characteristics are provided. A waveform storage device that stores a pattern and a waveform generator that generates a waveform by capturing a waveform pattern of an optimal voltage-frequency characteristic from the waveform storage device by a signal from the refrigerant flow rate detection device and outputs the waveform to the inverter device are provided. As a result, even if the load on the compressor increases or decreases depending on the operating state of the indoor unit, the output of the inverter device always maintains the optimum voltage-frequency characteristics for the compressor, so that an extremely efficient air conditioner can be realized. Can be achieved, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a refrigerant flow rate-frequency characteristic diagram stored in a refrigerant flow rate detection device in the air conditioning apparatus of the embodiment.

FIG. 3 is a voltage-frequency characteristic diagram of waveform patterns stored in a waveform storage device of the air conditioning apparatus of the embodiment.

FIG. 4 is a flowchart showing the operation of the waveform generator in the air-conditioning apparatus of the embodiment.

FIG. 5 is a schematic configuration diagram of a conventional air conditioner.

[Explanation of symbols]

 1 Compressor 18 Inverter Device 19 Refrigerant Flow Rate Detection Device 20 Waveform Storage Device 21 Waveform Generation Device

Claims (1)

[Claims] 1. A compressor, the number of revolutions of which is controlled by an inverter device, a refrigerant flow rate detecting device for detecting a flow rate of a refrigerant flowing through a refrigeration circuit, and a waveform memory storing waveform patterns having different voltage-frequency characteristics. And a waveform generator for generating a waveform by outputting a waveform pattern of an optimum voltage-frequency characteristic from the waveform storage device based on a signal from the refrigerant flow rate detection device and outputting the waveform to the inverter device. Air conditioner.