JPS63233240A - Operation controller of air conditioner - Google Patents

Abstract

PURPOSE:To make small the range of variation in room cooling capability input and especially the value of lowest input by providing an intermediate discharge port which opens up to the midway of the compression stroke of a compressor and a bypass channel which is connected to the side of the suction piping of the compressor through a solenoid valve and flow rate controller from the intermediate discharge port. CONSTITUTION:A solenoid valve 26 is provided in a bypass channel which is connected to the suction channel of a compressor through a flow rate controller from the intermediate discharge port of a three-phase compressor which has an intermediate discharge port which opens up to the midway of the compression stroke, and at first operation frequency, room temperature and room humidity are read in a LSI 14, a judgement by comparison of the operation frequency with a set frequency is made and after judgement by comparison of the room temperature with room humidity and respective set values, a transistor 14 for switching is turned ON only under the condition that the room temperature is below a set temperature and, further, the room humidity is below a set humidity and by the signal of LSI 14, and a relay 16 is turned ON and the solenoid valve 26 opens. With this arrangement it is possible to obtain the value of the lowest input which could not be achieved in air conditioners of frequency conversion device mounting type.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an operation control device for an air conditioner equipped with a frequency converter.

Conventional technology In recent years, air conditioners equipped with frequency converters have been designed to have a wide set wave number range to expand the cooling capacity and widen the variable range in order to improve the feeling during operation or to save energy during operation. .

An example of the above-mentioned conventional air conditioner equipped with a frequency converter will be described below without reference to the drawings.

FIGS. 5 and 6 show conventional cryocycle diagrams and electrical circuit diagrams.

In FIG. 5 and FIG. 6, 101 is a pressure reduction device, 102 is a four-way valve, 103 is an indoor heat exchanger, 104 is a pressure reducing device,
105 is an outdoor heat exchanger.

In FIG. 6, 106 is a power supply device including a noise filter, a diode, IJ, etc., 107 is a power transistor device, and 10B is a microcomputer.

The operation of the air conditioner equipped with a frequency converter configured as above will be described below.

If, the power transistor device 107 generates a three-phase waveform by the unequal width pulses output from the microcomputer 10B, and the three-phase compressor 101 is driven. Further, the frequency-voltage characteristics of the compressor are set and operated according to the pulse width and period outputted from the microcomputer 108.

Problems to be Solved by the InventionHowever, in the above configuration, the minimum rotational speed at which the compressor 101 can be operated is limited due to the torque of the compressor IQ1, and the rotational speed of the compressor is not controlled in terms of frequency. The problem is that it is difficult to pursue a range of performance inputs, especially low performance inputs, by simply controlling the output power.

The present invention solves the above problems by reducing the variable range of cooling power input, especially the value of low power input, thereby improving the feeling and saving energy.

Means for Solving the Problems In order to solve the above problems, the air conditioner operation control device of the present invention comprises a compressor composed of a cylinder, a piston, etc.
A capacity control compressor is used, which has an intermediate discharge port that opens halfway through the compression process of this cylinder, and an intermediate discharge passage that communicates with the outside of the compressor from this intermediate discharge port. A bypass path is provided that is connected to the suction pipe side of the compressor via a control device, and the compressor is operated at a specified frequency within a variable frequency range, and only when the indoor temperature is below the set temperature and the indoor humidity is below the set humidity. An electromagnetic on-off valve control means for opening the electromagnetic on-off valve is provided.

According to the above-described configuration, the present invention operates the compressor at a specified low frequency, opens only when the indoor temperature is below the set temperature and furthermore, when the indoor humidity is below the set humidity, and controls the flow rate from the intermediate discharge port of the compressor. Since bypass is performed to the suction passage through the device, low-performance input values that could not be achieved with air conditioners equipped with a frequency converter can be achieved.

Embodiment Hereinafter, an embodiment of the operation control device for an air conditioner equipped with a frequency converter according to the present invention will be described with reference to the drawings.

FIG. 1 shows a circuit diagram of an operation control device for an air conditioner equipped with a frequency converter according to an embodiment of the present invention.

In FIG. 1, 8 is a humidity detection circuit including a humidity sensor and an AD converter, 9 is a resistance circuit for setting humidity, and 1101 dJt
11 is a temperature detection circuit including a thermistor, 12 is a resistance circuit for setting temperature, 13 is a comparator I, 14 is a microcomputer (hereinafter referred to as LSI), and 15 is an electromagnetic shut-off valve 26 provided in the bypass path. transistors for switches,
16 is a relay for the electromagnetic on-off valve 26, 17 is a blower transistor device, 1B is a three-phase compressor, and 19 is a power supply device including a power supply, a fuse, a noise filter, a diode bridge, etc.

Figure 2 is a refrigeration cycle diagram of the air conditioner.
is a three-phase compressor, 21 is a four-way valve, 22 is an indoor heat exchanger, 23 is a pressure reduction device, 24 is an outdoor heat exchanger, 25 is a flow rate control device, and 26 is a connection from the intermediate discharge port of the compressor to the compressor. This is an electromagnetic on-off valve that opens and closes a bypass path connected to the suction path of the pump.

The operation of the operation control device for an air conditioner equipped with a frequency converter configured as described above will be described below with reference to FIGS. 1 to 4.

FIG. 3 is a block diagram representing the control device using function realizing means, and the relationship with each component shown in FIG. 1 is shown below.

The humidity detecting circuit 8 shown in FIG. 1 corresponds to the indoor humidity detecting means, the set humidity circuit 9 corresponds to the set humidity value, and the comparator I [10 which compares and determines the indoor humidity and the set humidity value corresponds to the comparing means H.

Further, the temperature detection circuit 11 corresponds to an indoor temperature detection means, the set temperature circuit 12 corresponds to a set temperature value, and the comparator Ii3 which compares and determines the indoor temperature and the set temperature value corresponds to a comparison means 1. L size
The electromagnetic on-off valve 26 built into SI 14 is fully open [-1
The storage circuit that stores the set frequency when the operation is performed corresponds to the storage means, and the determination circuit built into the LS 114 that reads the operating frequency and compares and determines the operating frequency with the control set frequency of the electromagnetic on-off valve 26 corresponds to the determination means. Furthermore, LS1 determines the operation of the electromagnetic on-off valve 26 by a combination of the control signal of each comparator 13 and IJlo and the judgment signal of the judgment circuit built in LS114.
The built-in arithmetic circuit 14 corresponds to the arithmetic means, and the switching transistor 15 and relay 16 that operate the electromagnetic on-off valve 26 correspond to the electromagnetic on-off valve control means.

Figure 4 is a flowchart 1 showing the operation flow of the operation control device.First, the operating frequency, indoor temperature, and indoor humidity are read, and the operating frequency and set frequency are compared and determined. As a result of comparing and judging the indoor humidity with each set value, only when the operating frequency matches the set frequency, the indoor temperature is below the set temperature value, and the indoor humidity is below the set humidity value, the LS114 signal is used to activate the switch. 1-transistor 15 is turned on, 1-16 is turned on, and solenoid on-off valve 2 is turned on.
6 opens. In other cases, the switching transistor 15 is in an off state and the electromagnetic on-off valve is closed.

As described above, according to this embodiment, in an air conditioner equipped with a frequency converter, a bypass path is connected from the intermediate discharge port of the three-phase compressor 2° to the suction path of the compressor via the flow rate control device 25. By providing an electromagnetic opening/closing valve 25 that opens only when the indoor temperature is below the set temperature value and the indoor humidity is below the set humidity value at the set low frequency, during the lowest frequency operation during cooling, Compared to current air conditioners equipped with frequency converters, it is possible to significantly reduce the input power and improve the feeling of cold air.

In addition, in the embodiment 1, the electromagnetic on-off valve 26 is provided between the flow rate control device 25 and the suction path of the compressor 2o, but the electromagnetic on-off valve 26 is provided between the intermediate discharge port of the compressor 20 and the flow rate control device 25. It may be provided in between.

Furthermore, in the first embodiment, the set frequency for opening the electromagnetic on-off valve 26 may be set to a plurality of frequencies.

Effects of the Invention As described above, the present invention provides an air conditioner equipped with a frequency converter, in which electromagnetic switching is performed from the intermediate discharge port of a three-phase compressor to a bypass path connected to a suction path of the compressor via a flow rate control device. By installing an operation control device that opens the electromagnetic on-off valve only when the operating frequency matches the set frequency, the indoor temperature is below the set temperature, and the indoor humidity is below the set humidity, it is possible to eliminate the conventional frequency converter. It is possible to significantly improve the variable range of power input during cooling, which cannot be achieved with on-board air conditioners, especially the value of low power input, and it has the effect of improving the feeling during operation and dramatically improving energy savings.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of an operation control device for an air conditioner equipped with a frequency converter according to an embodiment of the present invention, Fig. 2 is a refrigeration cycle diagram of the operation control device, and Fig. 3 is a diagram of the operation control device of the same operation control device. Fig. 4 is a flowchart of the operation control device, Fig. 5 is a refrigeration cycle diagram of a conventional air conditioner equipped with a frequency converter, and Fig. 6 is a conventional electric circuit diagram. . 8...Humidity detection circuit, 9...Setting humidity circuit, 10...Comparator l, 11...Temperature detection circuit, 12...Setting temperature Circuit, 13...
・Comparator ■, 14...Microcomputer,
15... Switch transistor, 16...
...1J Ray, 17...Puff-1-ransistor device, 18...3-phase compressor, 19. River...Power supply device, 21. ... Four-way valve, 22 ... Indoor heat exchanger, 23 ... Pressure reducing device, 24 ... Outdoor heat exchanger, 25 ... Flow rate control device, 26 ... Solenoid on-off valve. Name of agent: Patent attorney Toshio Nakao Haga 1 person No. 4
Figure 5

Claims (1)

[Claims] A refrigeration cycle is constructed by connecting a compressor, a four-way valve, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger in a ring, and the compressor is composed of a cylinder and a piston, etc. A compressor whose capacity can be controlled is constructed by providing an intermediate discharge path that communicates with the outside of the compressor from an intermediate discharge port that opens halfway through the compressor. A bypass passage connected to the suction passage side is provided, and a temperature detection means for detecting the indoor temperature; a comparison means I for comparing and determining the signal of the temperature detection means with a set temperature value and outputting H/L control signals; a humidity detection means for detecting humidity; a comparison means II for comparing and determining a signal from the humidity detection means with a set humidity value and outputting H/L control signals;
a calculation means that performs a combination calculation of the control signals output from the comparison means I and II when the compressor is operated at a specified frequency in the variable frequency range; An operation control device for an air conditioner, comprising an electromagnetic on-off valve control means that opens the electromagnetic on-off valve when both temperature and indoor humidity are below a set value.