JPH06257906A - Airconditioning apparatus - Google Patents

Abstract

PURPOSE:To provide an airconditioning apparatus which enables the detecting of a trouble such as contact welding of a relay which controls current to a compressor to display. CONSTITUTION:An opening-closing means 2 to perform an opening or closing between a compressor 3 and a power source, a current detection means 4 to detect current flowing through the compressor 3 and an operation drive means 1 to drive the opening-closing means 2 according to a room temperature are arranged. In addition, a trouble judging means 5 is provided to judge a trouble' of the opening-closing means 2 from an opening/closing directing state to the opening-closing means and a current value detected by the current detection means 4 and a trouble display means 6 which performs a display when given an output from the trouble judging means 5 to notify a trouble to a user.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a domestic air conditioner against failure.

[0002]

2. Description of the Related Art A conventional air conditioner is constructed as shown in FIG. The operation driving means 1 drives the opening / closing means 2 composed of a relay to open / close according to the room temperature to turn on / off the power to the compressor 3 to operate the compressor 3 so that the room temperature becomes constant. Further, the current to the compressor 3 is detected by the current detecting means 4 composed of CT to determine the start / end timing of overcurrent protection and de-ice.

[0003]

However, in the above configuration, when the opening / closing means 2 remains closed due to a failure such as contact welding, the user cannot judge the failure and the compressor 3 continues to operate. However, there is a problem that it is expected that a power outage or the like will occur at home.

An object of the present invention is to provide an air conditioner capable of detecting a failure of the opening / closing means 2 and notifying the user.

[0005]

The air conditioner of the present invention comprises:
Opening / closing means for opening / closing between the compressor and the power source, current detecting means for detecting a current flowing to the compressor, operation driving means for driving the opening / closing means according to room temperature, and the opening / closing means by the operation driving means. The failure determination means for determining the failure of the switching means based on the opening / closing instruction state and the current value detected by the current detection means, and the failure display means for indicating the failure by displaying the output of the failure determination means. It is characterized by that.

Further, the present invention is characterized in that an opening / closing means failure recovery means for repeatedly outputting an opening / closing drive signal to the opening / closing means when the failure judging means outputs is provided. Further, the present invention is characterized in that a leakage means is provided for causing a current inputted to the compressor to be leaked to the earth when the failure determination means outputs the leakage current.

Further, the present invention is characterized in that a second opening / closing means is provided between the compressor and the opening / closing means, which is normally closed and opens when the failure judging means outputs.

[0008]

According to this structure, the failure determination means determines the failure of the opening / closing means based on the opening / closing instruction state of the opening / closing means by the operation driving means and the current value detected by the current detecting means. The failure display means displays that there is a failure.

If the failure determining means determines that there is a failure,
The opening / closing means failure recovery means repeatedly sends an opening / closing signal to the opening / closing means to generate vibration in the opening / closing means to recover a failure such as welding of contacts.

If the failure determining means determines that there is a failure,
The second opening / closing means is opened to shut off the electric current to the compressor to ensure safety. Also, when the failure determination means determines that there is a failure,
The current of the compressor is leaked and the leak breaker in the building is activated to stop the failed air conditioner promptly.

[0011]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows a first embodiment of the present invention.
Reference numeral 1 denotes an operation driving means including a sensor for detecting the room temperature and a microcomputer, and opens / closes an opening / closing means 2 including a relay according to the room temperature to control energization of a compressor 3 outside the room.
Reference numeral 4 is a current detection means composed of CT, which detects the current flowing to the compressor 3. Reference numeral 5 is a failure determination means for determining the failure of the opening / closing means 2, and determines the failure based on the opening / closing instruction state from the driving / driving means 1 to the opening / closing means 2 and the output of the current detecting means 4. Reference numeral 6 denotes a failure display means composed of an LED, which is displayed and informs the user when there is an output from the failure determination means 5.

With this configuration, when the contact of the relay of the opening / closing means 2 is welded, it is detected that the current is flowing to the compressor 3 even though the driving / driving means 1 outputs the closing signal. Detected by the means 4, the failure determination means 5 outputs it to the failure display means 6 to display the failure to the user.

FIG. 2 is a concrete circuit diagram, 7 is a room temperature sensor for detecting the room temperature, 8 is a current detection circuit such as CT for detecting the current flowing to the compressor 3, 9 is a relay, 10 is an LED,
Reference numeral 11 is a so-called one-chip microcomputer including a CPU, a ROM, a RAM, etc., and judges the failure of the relay 9 from the state of the equipment detected by the temperature sensor 7 and the current detection circuit 8, and LE
Turn on D10. When the device is turned on and the program is started, the microcomputer 11 fetches the current data detected by the current detection circuit 8 in step 12 shown in FIG. 3, the open / closed state of the relay 9 is detected in step 13, and the step 14 shows in step 14. If the open relay 9 is open and the current value detected in step 12 is greater than 0, then in step 15 LE
D10 is turned on to inform the user of the failure. The user or the service person can confirm that the contact welding of the relay 9 has occurred by confirming the lighting of the LED 10.

FIG. 4 shows a second embodiment. In this embodiment, the opening / closing means failure recovery means 16 is added to the above-mentioned first embodiment. In the first embodiment, the failure display means 6 only displays when there is an output from the failure determination means 5, but the opening / closing means failure recovery means 16 repeatedly outputs an opening / closing signal to the opening / closing means 2 when the failure determination means 5 outputs. Is configured to send. FIG. 5 is a specific circuit diagram. The microcomputer 11 judges the failure of the relay 9 based on the state of the device detected by the temperature sensor 7 and the current detection circuit 8, and when it judges that the relay 9 is broken, the microcomputer 9 repeats the relay 9. An open / close drive signal is output and vibrations are used to attempt to recover from failures such as relay contact welding. FIG. 6 is a flowchart showing that when the apparatus is turned on and the program is started, step 12
The microcomputer 11 fetches the current data to the compressor 3 detected by the current detection circuit 8 at step 13, the open / close state of the relay 9 is detected at step 13, and the current detected at step 12 when the relay 9 is open at step 14. If the value is greater than 0, the open / close drive signal is repeatedly output to the relay 9 in step 15.

FIG. 7 shows a third embodiment. In this embodiment, a second opening / closing means 17 is interposed between the opening / closing means 2 and the compressor 3. The second opening / closing means 17 opens to shut off the electric current to the compressor 3 when the failure determining means 5 determines a failure. FIG. 8 is a specific circuit diagram, and a relay 18 as the second opening / closing means 17 is interposed in series with the compressor 3. FIG. 9 is a flowchart thereof, and when the power is turned on to start the program, the current data to the compressor 3 detected by the current detection circuit 8 in step 12 is transferred to the microcomputer 11
Is detected, the open / close instruction state of the relay 9 is detected in step 13, and when the open / close means 2 is open in step 14 and the current value detected in step 12 is greater than 0, an open signal is sent to the relay 18 in step 19. .

FIG. 10 shows a fourth embodiment. In this embodiment, the electric leakage means 20 is provided, and when the failure determination means 5 outputs, the electric leakage is caused to interrupt the electric current to the compressor 3 by the electric leakage breaker in the building. FIG. 11 is a concrete circuit diagram. A relay 21 for grounding the circuit of the compressor 3 is provided as the electric leakage means 20, and when the contact of the relay 9 is welded, the operation driving means 1 outputs a closing signal. Nevertheless, when it is detected by the current detection circuit 8 that the current is flowing to the compressor 3, the microcomputer 11 closes the contact of the relay 21 to cause an electric leakage to shut off the power to the air conditioner and cause an accident. It can be prevented. FIG. 12 is a flow chart of the flow chart. When the apparatus is powered on and the program is started, the microcomputer 11 fetches the current data to the compressor 3 detected by the current detection circuit 8 in step 12, and the data is transferred to the relay 9 in step 13. The open / close instruction state is detected, and the current value detected in step 12 is 0 when the open / close means 2 is open in step 14.
If it is larger, the microcomputer 11 sends a close signal to the relay 21 in step 22 to activate the earth leakage breaker in the building to cut off the power supply to the air conditioner that has failed.

Although the failure display means is not provided in the second embodiment, it is possible to provide the failure display means and the opening / closing means failure recovery means.

[0018]

As described above, according to the present invention, when the relay for controlling the energization of the compressor has a failure such as contact welding, the failure can be determined with a simple structure, and the user can know the failure. Not only the failure is notified, but also safety measures such as power cutoff can be taken to enhance the safety of the air conditioner.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a circuit diagram of the same embodiment.

FIG. 3 is a flow chart of the embodiment.

FIG. 4 is a block diagram of a second embodiment.

FIG. 5 is a circuit diagram of the same embodiment.

FIG. 6 is a flowchart of the embodiment.

FIG. 7 is a block diagram of the embodiment.

FIG. 8 is a circuit diagram of the same embodiment.

FIG. 9 is a flowchart of the embodiment.

FIG. 10 is a block diagram of a fourth embodiment.

FIG. 11 is a circuit diagram of the same embodiment.

FIG. 12 is a flowchart of the same embodiment.

FIG. 13 is a block diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driving / driving means 2 Opening / closing means 3 Compressor 4 Current detection means 5 Failure determination means 6 Failure display means 16 Opening / closing means Failure recovery means 17 Second opening / closing means 20 Electric leakage means

Claims (4)

[Claims] 1. An opening / closing means for opening / closing between a compressor and a power source, a current detecting means for detecting a current flowing to the compressor, an operation driving means for driving the opening / closing means according to room temperature, and the operation drive. Means for judging the failure of the opening / closing means based on the opening / closing instruction state of the opening / closing means by the means and the current value detected by the current detecting means, and a failure indicating the failure by displaying the output of the failure judging means. An air conditioner comprising display means. 2. An opening / closing means for opening / closing between a compressor and a power source, a current detecting means for detecting a current flowing to the compressor, an operation driving means for driving the opening / closing means according to room temperature, and the operation drive. Means for judging the failure of the opening / closing means based on the opening / closing instruction state of the opening / closing means by the means and the current value detected by the current detecting means, and repeatedly outputting the opening / closing drive signal to the opening / closing means when the failure judging means outputs. An air conditioner provided with opening / closing means and failure recovery means. 3. An opening / closing means for opening / closing between a compressor and a power source, a current detecting means for detecting a current flowing to the compressor, an operation driving means for driving the opening / closing means according to room temperature, and the operation driving. Means for determining the failure of the opening / closing means based on the opening / closing instruction state of the opening / closing means by the means and the current value detected by the current detecting means, and normally between the compressor and the opening / closing means and normally closed. An air conditioner provided with a second opening / closing means that opens when the failure determination means outputs. 4. An opening / closing means for opening / closing between a compressor and a power source, a current detecting means for detecting a current flowing to the compressor, an operation driving means for driving the opening / closing means in accordance with room temperature, and the operation drive. Means for judging the failure of the opening / closing means based on the opening / closing instruction state of the opening / closing means by the means and the current value detected by the current detecting means, and the current input to the compressor when the failure judging means outputs the ground. An air conditioner equipped with a leaking means for leaking electricity.