JPS62261844A - Split type air-conditioning machine - Google Patents

Abstract

PURPOSE:To protect a variable frequency device from breakage due to thermal runway and/or overcurrent by a method wherein the operation of the variable frequency device is stopped and the operator is informed of abnormality of the device when the abnormality of the variable frequency device is detected. CONSTITUTION:When an abnormality signal is inputted from a variable frequency device 8 into an outdoor micro-computer 30, the presence of the abnormality signal is decided three times continuously. When it is decided that the abnormality exists as the result of said decision, a stopping signal is transmitted from an outdoor transmitting and receiving device 31 into an indoor transmitting and receiving device 11 through a serial signal wire 2. An indoor micro-computer 10 puts a relay 15 off on the basis of the stopping signal received through the indoor transmitting and receiving device 11 to intercept the supply of electric power for an outdoor machine 3. Accordingly, the supply of electric power for an inverter is intercepted and the variable frequency device 8 may be protected from breakage due to overcurrent and/or thermal runaway. In this case, an indicator 13 lightens to inform the operator that the abnormality is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a split type air conditioner.

[Conventional technology]

FIGS. 3 and 4 show a conventional split air conditioner disclosed in, for example, Japanese Patent Laid-Open No. 59-48439.

In the figure, reference numeral 5 denotes an indoor unit, which is composed of an indoor control microcomputer (hereinafter referred to as an indoor microcomputer) 50, an indoor transmitting/receiving circuit 51, and a room temperature detection thermistor 52. A control signal is generated by comparing the room temperature and the set temperature, and this control signal is transmitted from the indoor transmitting/receiving circuit 51 via the serial signal line 6. Reference numeral 7 denotes an outdoor unit, which is composed of an outdoor control microcomputer (hereinafter referred to as outdoor microcomputer) 70 and an outdoor transmitting/receiving 4g circuit 71. The variable frequency device 8 is controlled 0N10FF based on the signal. The variable frequency device 8 includes a converter 80 that converts alternating current into direct current;
an inverter 82 that converts the frequency to voltage; an induction motor 83 driven by the AC voltage output from the inverter 82; and an inverter 82 based on signals from the indoor microcomputer 50.
84.

Next, the effect will be explained.

The indoor microcomputer 50 compares the temperature detected by the thermistor 12 and the set temperature, and based on the comparison result, transmits a control signal from the indoor transmitting/receiving circuit 51 to the outdoor unit 3 via the serial signal line. In the outdoor unit 3, the outdoor transmitting/receiving circuit 71
The control signal is received by the outdoor microcomputer 70, and based on the received control signal, the outdoor microcomputer 70 sets the variable frequency device 8 to zero.
N10FF control.

[Problem that the invention seeks to solve]

Since the conventional split type air conditioner is configured such that the variable frequency device 8 is controlled by the indoor microcomputer 50 via the outdoor microcomputer 70, current flow into the inverter 82, which is a component of the variable frequency device 8, is prevented. Even if an overcurrent protection circuit (not shown) is activated or a protection circuit (not shown) that protects the semiconductor elements constituting the inverter from thermal runaway is activated, the variable frequency device 8 is activated by the indoor microcomputer 5.
Since it continues to operate without being stopped by zero, there is a problem that it may be destroyed due to thermal runaway and overcurrent.

This invention was made to solve the above-mentioned problems, and aims to reliably protect a variable frequency device from destruction caused by thermal runaway and overcurrent.

[Means for solving problems]

The split air conditioner according to the present invention includes an indoor unit,
The outdoor unit is composed of an outdoor unit and a transmitting/receiving device for communicating between the indoor unit and the outdoor unit, and the outdoor unit has a variable frequency device for controlling an induction motor, and the variable frequency is controlled by the abnormality detection means. When an abnormality is detected in the device, the operation of the variable frequency device is stopped by the operation stop means, and at the same time, the abnormality of the variable frequency device is notified by the abnormality notification device.

[Effect]

Since the operation stop means in this invention is configured to stop the operation of the variable frequency device when the abnormality detection means detects an abnormality in the variable frequency bag, it is possible to protect the variable frequency device from destruction due to thermal runaway and overcurrent. can.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the invention. In the figure, 8 indicates the same part as in FIG. Reference numeral 1 denotes an indoor unit, which includes an indoor control microcomputer (operation stop means, hereinafter referred to as indoor microcomputer) 10, an indoor transmitting/receiving device 11, a thermistor 12 for detecting room temperature, an indicator (abnormality notification means) 13, and an AC power source. 14 and the outdoor unit 3 described later? ! The indoor microcomputer IO compares the room temperature detected by the thermistor 12 with the set temperature, forms a control signal, and sends this control signal to the indoor transmitting/receiving circuit 11. It is transmitted via the real signal line 2. The indicator 13 lights up when there is an abnormality in the variable same wave number device, which will be described later.

Reference numeral 3 denotes an outdoor unit, which is composed of an outdoor control microcomputer (abnormality detection means, hereinafter referred to as outdoor microcomputer) 3O, an outdoor transmitting/receiving device 31, and a variable frequency device 32; Based on the received control signal from the indoor transmitting/receiving device 11, the variable frequency device 8 is controlled on a 0N10FF basis.

Next, one effect will be explained.

The indoor microcomputer 10 compares the temperature detected by the thermistor 12 and the set temperature, and transmits a control signal to the outdoor unit 3 via the indoor transmitting/receiving device 11 based on the comparison result (STEP-2). In the outdoor unit 3, the outdoor transceiver 31 receives the control signal (STEP-3), and based on the received control signal, the outdoor microcomputer 30 controls the variable frequency device 8 to 0N10FF (STEP-4).

By the way, when an abnormal signal is input from the variable frequency device 8 to the outdoor microcomputer 30, the presence or absence of the abnormal signal is determined three times in succession, and if it is determined that there is an abnormality, the outdoor transmitter/receiver 31 connects the serial signal line. Indoor transmitting/receiving device 1 via 2
Send a stop signal to 1 (STEP-+3), then indoor-7-i:710.

Received via indoor transmitter/receiver 11 (STEP-7)
Based on the stop signal, relay 15 is turned off (STEP
-8) Cut off the power supply to the outdoor unit 3.

Therefore, the power supply to the inverter 82 is cut off, protecting the variable frequency device 11 from destruction due to overcurrent and thermal runaway. At this time, the display 13 lights up to notify that an abnormality has occurred.

In the above embodiment, the display 13 is configured to light up in the event of an abnormality, but if the display 13 is made to blink,
It is possible to draw even more attention.

Alternatively, a buzzer may be used instead of the single display to alert the user.

〔Effect of the invention〕

As described above, according to the present invention, since the variable frequency device is configured to stop when the variable frequency device is abnormal, it is possible to protect the variable frequency device from destruction caused by overcurrent and thermal runaway. be.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is an operation flowchart, Fig. 3 is a diagram showing a conventional example of a split type air conditioner, and Fig. 4 is a block diagram showing the configuration of a variable frequency device. It is. In the figure, 1...indoor unit, 2...outdoor unit, 3...
- Microcomputer for indoor control, 8... Variable frequency device, 11... Indoor transmitting/receiving device, 13... Display unit, 30... Microcomputer for outdoor control, 31.
...It is an outdoor transmitting and receiving device. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A split type air conditioner comprising an indoor unit, an outdoor unit, and a transmitting/receiving device for communicating between the indoor unit and the outdoor unit, and the outdoor unit has a variable frequency device that controls an induction motor. , comprising an abnormality detecting means for detecting an abnormality in the variable frequency device, an operation stopping means for stopping the operation of the variable frequency device when the variable frequency device is abnormal, and an abnormality notification means for notifying an abnormality in the variable frequency device. A split-type air conditioner characterized by: