JPH0875215A - Trouble diagnosis indicator for air-conditioning machine - Google Patents

Abstract

PURPOSE: To permit the indication of multitude of results of trouble diagnosis economically by indicating the results of trouble diagnosis through a scale provided in accordance with the movement of an air direction plate pivoted by a flap motor. CONSTITUTION: A scale board 54, indicating the angular position of pivoting is mounted on a side plate, for example, at the circumference of the pivoting tip ends of upper and lower flaps 51 while the results of trouble diagnosis, effected by self diagnosis function of a microcomputer automatically, are converted into respective corresponding pulse numbers to output them into a driving circuit. According to this method, a flap motor (stepped motor) is pivoted by the number of steps corresponding to the number of pulses whereby the tip ends of the upper and lower flaps 51 show the angular position of the scale board 54. Accordingly, when 5 degrees of angular range of the pivoting range of 120 degrees of the upper and lower flaps 51, for example, are allocated to the results of trouble diagnosis, 24 results of trouble diagnosis can be indicated. Further, when the resolution of the angular position of the tip ends of upper and lower flaps 51 is increased, much more results of trouble diagnosis can be indicated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure diagnosis display device for displaying a failure condition of an air conditioner, and particularly for an air conditioner suitable for displaying self-diagnosis results automatically performed by the device itself. The invention relates to a failure diagnosis display device.

[0002]

2. Description of the Related Art Conventionally, an air conditioner is provided with a self-diagnosis function so that when a failure occurs, a service person can quickly find the failure point and easily repair it. Further, an LED is used as a failure diagnosis indicator for displaying the diagnosis result.

The fault diagnosis indicator is not necessary for the user directly, and since it causes confusion when touched by the user, it is usually arranged inside the air conditioner at a place where the user does not see it. ing.

[0004]

However, most of the inside of the air conditioner is occupied by ventilation passages or mechanical parts containing moisture and hot air, and further, due to the recent demand for compactness, the above-mentioned failure diagnosis indicator is installed. It is difficult to secure a suitable place for Further, many input / output devices such as various sensors and driving devices are connected to the microcomputer that controls the blinking of the LED, and there is little room to connect new devices to the connection port.

On the other hand, the diagnostic function has advanced and is currently 20
It is possible to diagnose faults above the street. In spite of that, since the conventional fault diagnosis indicator is provided with at most 3 LEDs for the above reasons, 8 types of fault diagnosis can be performed by combining the turning on and off of the LEDs.
Even if the blinking state of was taken in, there was a problem that at most 16 kinds of diagnostic results could be displayed.

The present invention solves the above problems and provides an air conditioner failure diagnosis display device which can economically display more failure diagnosis results without additional equipment for that purpose. To aim.

[0007]

The invention according to claim 1 is
In a failure diagnosis display device for an air conditioner that displays a failure diagnosis result by self-diagnosis performed automatically by the device itself, the failure diagnosis result is rotated by a step motor and displayed by an angle of a wind direction plate.

According to a second aspect of the present invention, in the failure diagnosis display device for an air conditioner, which displays the failure diagnosis result by self-diagnosis performed automatically by the device itself, the failure diagnosis result is L
The display is characterized by a combination of the ED display and the angle of the wind direction plate rotated by the step motor.

[0009]

According to the structure of claim 1, since the failure diagnosis result is displayed by using the wind direction plate which has been conventionally provided in the air conditioner, there is no need to add any parts, and a large number of economically economical devices are provided. The failure diagnosis result can be displayed.

According to the second aspect of the present invention, by using the LED display and the wind direction plate, more fault diagnosis results can be displayed without adding extra parts as compared with the conventional device. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a refrigerant piping system diagram of an air conditioner to which the present invention is applied, in which a solid arrow indicates a refrigerant flow during cooling, and a broken arrow indicates a refrigerant (heat medium) during heating. A solid arrow having a black mark in the middle indicates the flow of the refrigerant (heat medium) during defrosting.

In the configuration shown in the figure, during the cooling operation, the refrigerant gas discharged from the compressor 1 disposed on the outdoor unit side passes through the muffler 2 for muffling and is switched as shown by the solid line, as indicated by the solid line arrow. It is supplied to the outdoor unit side heat exchanger 4 via the four-way switching valve 3 and is condensed and liquefied. At this time, the heat generated is radiated to the outside air by a fan (not shown).

The refrigerant liquefied in the outdoor unit side heat exchanger 4 is decompressed by the capillary tube 5 and foreign substances such as dross are removed by the strainer 6, and then the indoor unit side heat exchanger 7 is passed through a valve or the like. And is vaporized to be gasified. The cold heat generated at this time is taken into the room by a fan (not shown) provided on the indoor unit side.

The refrigerant gasified in the indoor unit side heat exchanger 7 is sent to the outdoor unit side through a valve or the like,
It is supplied to the accumulator 9 through the muffler 8 for muffling, and further through the four-way switching valve 3. After the pressure is further reduced by the accumulator 9, it is separated into gas and liquid, only the refrigerant gas is supplied to the compressor 1, and the series of operations described above is repeated again.

On the other hand, during the heating operation, the refrigerant gas discharged from the compressor 1 arranged on the outdoor unit side is
As shown by the broken line arrow, it passes through the muffler 2 for muffling and is further switched as shown by the broken line, and is supplied to the indoor unit side heat exchanger 7 via the valve etc. and is condensed and liquefied. It At this time, the heat generated is radiated indoors by an indoor unit side fan (not shown).

The refrigerant liquefied in the indoor unit side heat exchanger 7 is again sent to the outdoor unit via a valve, etc., and foreign substances such as dross are removed by the strainer 6 and then transferred to the capillary tube 5. . The refrigerant decompressed by the capillary tube 5 is supplied to the outdoor unit side heat exchanger 7 to be evaporated and gasified. The cold heat generated at this time is discharged into the outside air by an outdoor unit side fan (not shown).

When the outside air temperature is low due to the release of cold heat from the outdoor unit side heat exchanger 4, frost formation occurs. By detecting the frosting state on the outdoor unit and opening the electromagnetic valve 10, a part of the refrigerant gas discharged from the compressor 1 is added to the refrigerant supplied from the capillary tube 5 to the outdoor unit side heat exchanger 4. To be Thus, the refrigerant gas supplied to the outdoor unit side heat exchanger 4 is heated and contributes to defrosting.

However, when the outside air temperature is extremely low and continuous operation is performed for a long period of time, frosting still progresses and heating operation efficiency is reduced. Therefore, in such a case, the electromagnetic valve provided in the refrigerant supply path supplied from the outdoor unit to the indoor unit is closed and the supply of the refrigerant to the indoor unit side heat exchanger 7 is shut off by detecting the state. It As a result, all the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 is supplied from the compressor 10 to the outdoor unit side heat exchanger 4, and defrosting is rapidly performed.

2 and 3 are block diagrams of a control circuit for performing the above-mentioned operation control. FIG. 2 is a circuit diagram of the indoor unit side, and FIG. 3 is a circuit diagram of the outdoor unit side. Is.

On the indoor unit side, as shown in FIG. 2, a motor power supply 111, a control circuit power supply 112, a power supply board 11 on which a serial power supply 113 for communication is mounted, a serial circuit 121, a flap motor 13, and a fan. Drive circuit 122 for driving the motor 14, microcomputer 123
A control board 12 on which the above are mounted, a display board 15, a sensor board 16 and a switch board 17 which are respectively connected to the microcomputer 123 are arranged.

On the other hand, on the outdoor unit side, as shown in FIG. 3, a serial circuit 311, a microcomputer 312, a switching power supply 313 for turning on and off the power transistors of the compressor 1 drive circuit 33, noise filters 314, 3
A control board 31 on which 15, 316 and the like are mounted, a diode bridge circuit board 32, and the like are arranged.

3 and the indoor unit side shown in FIG.
The outdoor unit side shown in FIG.
It is electrically connected via a cable between units via B.

The terminal board 20A has three terminals,
, And the commercial power source is supplied to the outdoor unit side, the power source line connected to the plug 18 is connected to two terminals. Further, in order to supply the serial power supply and the control signal to the outdoor unit, a signal line on which the control signal from the microcomputer 123 is superimposed on the serial power supply can be connected to the terminal via the serial circuit 121.

Similarly, the terminal board 20B provided in the outdoor unit is also provided with three terminals, and a power supply line for taking in commercial power to the outdoor unit side, a serial power supply, and a control signal. Are respectively connected to the signal lines for taking in.

2 and 3, when the plug 18 provided on the indoor unit side is inserted into an outlet of a commercial power source (not shown), power is supplied to the power supply board 11 and the indoor unit side is started up. As a result, the microcomputer 123 operates to operate the drive circuit 122 to operate the power relay 19 to close the contact 19A, whereby commercial power is also supplied to the outdoor unit side via the terminal. At the same time, the serial power supply 113 is also supplied to the outdoor unit side via the terminal.

In this state, when the operating mode, desired temperature, desired air volume, etc. are set by the remote controller (not shown) and transmitted to the indoor unit body, the signal is received by the receiving circuit of the sensor substrate 15 and input to the microcomputer 123. . As a result, the microcomputer 123 causes the flap motor 13 and the fan motor 1 via the drive circuit 122 according to the conditions set by the remote controller.
Drive 4

Control signals including those relating to the outdoor unit among the set conditions are superimposed on the serial power source through the serial circuit 113 and supplied from the terminal to the outdoor unit side shown in FIG.

The serial power source and the control signal are separated by the serial circuit 311 and supplied to the microcomputer 312. As a result, the microcomputer 312 is activated by the supply of serial power, and the control signal and various sensors 34 are
The compressor 1, the four-way valve 3, the solenoid valve 10, and the fan motor 3 which are arranged on the outdoor unit side by taking in signals from the
It controls equipment such as 7.

After the control signal of the commercial power supply supplied between the terminals is cut by the noise filter 314, the voltage is rectified by double voltage through the reactor 35, the diode bridge 32, and the capacitor, and the compressor 1 is driven through the noise filter 315. It is supplied to the inverter circuit 33 which is a circuit.

At this time, the microcomputer 312 controls the switching power supply 313 to control the conduction state of the power transistor that supplies power to the three-phase coil of the compressor 1. As a result, the outdoor unit side has the compressor 1, the four-way valve 3, and the operating condition set by the remote controller.
The operation control of devices such as the solenoid valve 10 and the fan motor 37 is performed.

FIG. 3 is a sectional structural view of the indoor unit. The indoor unit body is contained in a casing 43 composed of a full-face casing 41 and a rear casing 42.

Suction ports 44 and 45 are formed on the upper surface and the entire surface of the casing 43. The sucked air is cooled by a heat exchanger 47 after dust is removed by an electrostatic air cleaner 46. Alternatively, it is heated and blown out from the air passage 49 by the cross flow fan 48 driven by the fan motor 14.

At this time, the air blown out from the air conditioner main body is directed by the left-right air flow direction plate (referred to as left and right flaps) 50 and the up-down air flow direction plate (referred to as upper and lower flaps) 51 disposed in the air passage 49. Is changed.

Reference numeral 52 is a drain pan that collects the cooling water flowing from the heat exchanger 47 during cooling and flows it to the drain pipe, and also serves as an upper plate of the air passage 49, and 53 connects the indoor unit and the outdoor unit. These are the necessary transition wiring and piping.

A step motor is used as the flap motor 14 for driving the upper and lower flaps 51, and its angular position is determined by the number of steps of the flap motor 14. Therefore, the upper and lower flaps 5
The tip position of 1 can be controlled almost accurately by the number of pulses applied to the flap motor 14 from the microcomputer 123 via the drive circuit 122.

Therefore, in the present invention, a fault diagnosis is carried out by a self-diagnosis function which is automatically carried out by the microcomputer 123 by mounting a scale plate 54 indicating the turning angle position on, for example, a side plate around the tip of the upper and lower flaps 51. The result is converted into the corresponding number of pulses and output to the drive circuit 122. As a result, the flap motor 14 rotates by the number of steps corresponding to the number of pulses, and the tips of the upper and lower flaps 51 indicate the angular position of the scale plate 54. Therefore, for example, assuming that the upper and lower flaps 51 rotate in a range of 120 degrees, if the angular range is applied to the failure diagnosis result for 5 degrees, 24 kinds of failure diagnosis results can be displayed. Furthermore, by increasing the resolution of the angular position of the tip of the upper and lower flaps 51, more failure diagnosis results can be displayed.

The failure diagnosis performed by the microcomputer 123 is as follows.
For example, various sensors such as indoor temperature sensor, indoor heat exchanger temperature sensor, indoor humidity sensor, floor sensor, outdoor temperature sensor, outdoor current sensor, disconnection, short circuit, contact failure, serial communication circuit abnormality, protection There are many failure diagnoses such as failure of various circuits such as circuit operation and failure of various devices such as abnormal rotation of motor and compressor.

If a large number of these failure diagnosis results are combined with an LED indicator conventionally provided in the indoor unit, the resolution of the tip end angular position of the upper and lower flaps 51 can be displayed roughly. For example, the upper and lower flaps 51
Even if the tip angle position is set to 10 degrees, it is possible to display 24 kinds of failure diagnosis results by combining with one LED display, and further, 3 L that have been used conventionally.
When combined with an ED display, it is possible to display a larger number of failure diagnosis results.

The scale of the scale plate 54 is represented by a line extending radially from the center of rotation as shown in FIG. 4 in the above embodiment, but the scale is attached so that the flap 51 and the scale line are in the same direction. Or, any expression such as a projection shape is possible.

As is apparent from the above description, as the failure display means, the processing of the microcomputer 123 is slightly changed, and the failure display means is structurally modified as compared with the conventional apparatus without any modification such as addition of parts. An example is possible. Therefore, the present invention can be implemented only by modifying the failure diagnosis function of the existing air conditioner microcomputer and the software of its display means. Of course, when the air conditioner according to the present invention is newly manufactured, it is rather an LED rather than the conventional device.
It is possible to reduce the number of parts such as using one display or omitting it.

[0041]

According to the invention described in claim 1, since the failure diagnosis result is displayed by using the wind direction plate which has been conventionally provided in the air conditioner, there is no need to add any parts,
It is possible to display a large number of failure diagnosis results extremely economically.

According to the invention described in claim 2, the LED
By using the display and the wind direction plate, more failure diagnosis results can be displayed without adding extra parts as compared with the conventional device.

[Brief description of drawings]

FIG. 1 is a piping route diagram of an air conditioner showing an embodiment of the present invention.

FIG. 2 is a circuit diagram of the indoor unit side of FIG.

FIG. 3 is a circuit diagram of the outdoor unit side of FIG.

FIG. 4 is a side sectional view of the indoor unit shown in FIG.

[Explanation of symbols]

 14 flap motor 51 wind direction plate (flap) 54 scale plate 122 drive circuit 123 microcomputer

Claims (2)

[Claims] 1. A failure diagnosis display device for an air conditioner for displaying a failure diagnosis result by self-diagnosis performed automatically by the device itself, wherein the failure diagnosis result corresponds to movement of a wind direction plate rotated by a step motor. A failure diagnosis display device for an air conditioner, which is characterized in that it is displayed by a scale attached thereto. 2. A failure diagnosis display device for an air conditioner, which displays a failure diagnosis result by self-diagnosis automatically performed by the device itself, wherein the failure diagnosis result is displayed by an LED indicator and a wind direction plate rotated by a step motor. A failure diagnosis display device for an air conditioner, characterized by displaying in combination with movement.