KR20050114111A - Valve trouble detection apparatus for multi-air conditioner capable of heating and cooling simultaneously and trouble detection method thereof - Google Patents

Abstract

The present invention relates to a valve failure detection device and a failure detection method for a simultaneous heating and cooling multi air conditioner. The valve failure detection apparatus of the simultaneous heating and cooling type multi air conditioner according to the present invention includes a plurality of indoor units including an indoor heat exchanger, an outdoor unit having a compressor and an outdoor heat exchanger, and cooling and heating operation states of the indoor units. Heating and heating having a distributor connected between the indoor unit and the outdoor unit having a high-pressure valve and a low-pressure valve for opening and closing the high-pressure engine and low-pressure pipe and the high-pressure engine and the low-pressure engine, respectively, so that the refrigerant can be properly provided according to the A valve failure detection apparatus for a simultaneous multi air conditioner, comprising: a high pressure side temperature sensor disposed upstream of the high pressure valve along a flow direction of a refrigerant during a heating operation so as to detect a temperature of the high pressure engine; A low pressure side temperature sensor disposed at a downstream side of the low pressure valve along a flow direction of the refrigerant during a cooling operation so as to detect the temperature of the low pressure engine; And a fault detection unit for determining whether the high pressure valve and the low pressure valve are abnormal based on detection results of the high pressure side temperature sensor and the low pressure side temperature sensor. As a result, the failure of the valve can be easily recognized, and it is possible to quickly return to normal operation without trial and error.

Description

VALVE TROUBLE DETECTION APPARATUS FOR MULTI-AIR CONDITIONER CAPABLE OF HEATING AND COOLING SIMULTANEOUSLY AND TROUBLE DETECTION METHOD THEREOF}

The present invention relates to a valve failure detection device and a failure detection method for a simultaneous heating and cooling type multi air conditioner, and more particularly, it is possible to easily recognize the failure of the valve to quickly return to normal operation without trial and error The present invention relates to a valve failure detection device and a failure detection method of a cooling and heating simultaneous multi air conditioner.

In general, a single type air conditioner composed of a single outdoor unit and an indoor unit is widely used as a cooling device of a house, and a hot water circulation passage formed to circulate hot water on the floor and a boiler for heating water are used. It is used.

By the way, in the conventional air-conditioning using a single type air conditioner, the indoor space in which the indoor unit is installed can feel relatively cool, but due to the structure of the house having many walls and entrances, other indoor spaces can hardly feel the cooling feeling. In order to cool the indoor space, there is a need to separately install an indoor unit and an outdoor unit.

In recent years, so-called air-conditioning simultaneous multi-air conditioners capable of simultaneously cooling and heating different spaces have been devised and developed.

1 is a configuration diagram of a conventional air-conditioning simultaneous multi air conditioner, and FIG. 2 is a view illustrating a heating main operation of the air-conditioning simultaneous multi air conditioner of FIG. 1. As shown in these figures, the air-conditioning simultaneous multi air conditioner includes a plurality of indoor units 10 each provided with an indoor heat exchanger 11 and an indoor expansion device 13 arranged in a room, a compressor 22, and an outdoor unit. The outdoor unit 20 provided with the heat exchanger 24 and the distributor 40 which are arrange | positioned between the indoor unit 10 and the outdoor unit 20, and distribute | distribute a refrigerant suitably according to the operation mode of the indoor unit 10 are provided.

The outdoor unit 20 includes a plurality of compressors 22, a switching valve 26 disposed on the discharge side of the compressor 22 to switch the flow path of the refrigerant, and a plurality of outdoor heat exchangers 24. One side of the compressor 22 is provided with an accumulator 28 to provide a refrigerant in a gaseous state, and one side of the outdoor heat exchanger 24 is a blower fan 30 for promoting the flow of air so that heat exchange is increased It is provided. One side of the outdoor heat exchanger 24 along the flow direction of the refrigerant is provided with an outdoor expansion device 32 and a check valve 34.

On the other hand, the distributor 40, one side is connected to the discharge side of the compressor 22, the other side is a high-pressure engine 42 is connected to the indoor unit 10, one side is connected to the suction side of the compressor 22 and the other side is the indoor unit Low pressure engine 44 is connected to the (10), one side is connected to the outdoor heat exchanger 24, the other side is connected to the indoor unit 10, the liquid pipe 46, the high pressure engine 42 and the low pressure engine (44) And a plurality of high pressure valves 43 and low pressure valves 45 for respectively opening and closing the valves.

By such a configuration, the air-conditioning simultaneous multi-air conditioner has a cooling room operation mode in which the entire indoor unit 10 is cooled and cooled, a heating room operation mode in which the entire indoor unit 10 is heated by heating, and many of the indoor units 10 are cooled by air. The heating main body is operated in any one of a cooling main unit operation mode in which a small number is heated and a heating main operation mode in which many of the indoor units 10 are heated and a small number is cooled in a cooling mode.

When operating in the cooling main body operation mode, as shown in FIG. 1, the switching valve 26 switches the refrigerant flow path so that the refrigerant flows to the outdoor heat exchanger 24, and a part of the refrigerant discharged from the compressor 22. Is flowed to the distributor 40 along the liquid pipe 46 via the switching valve 26 and the outdoor heat exchanger 24, and part of the flow to the distributor 40 along the high-pressure engine 42. The refrigerant flowing along the liquid pipe 46 flows into each indoor unit 10 during the cooling operation to perform the cooling operation, and the refrigerant flowing along the high pressure engine 42 is heated through the high pressure valve 43. Inflow to (10) to perform the heating action. The refrigerant having performed the cooling action flows to the outdoor unit 20 along the low pressure pipe 44 via the low pressure valve 45 and is sucked into the compressor 22.

On the other hand, when operating in the heating main operation mode, as shown in Figure 2, the switching valve 26 switches the refrigerant passage so that the refrigerant via the outdoor heat exchanger 24 can be introduced into the accumulator 28 and The refrigerant discharged from the compressor 22 all flows to the distributor 40 along the high pressure engine 42. The refrigerant flowing along the high pressure engine 42 flows into the indoor unit 10 during the heating operation via the high pressure valve 43 to perform a heating operation, and flows along the liquid pipe 46. At this time, some of the refrigerant flowing along the liquid pipe 46 flows into the indoor unit 10 during the cooling operation to perform the cooling operation, and then flows along the low pressure engine 44 to the outdoor unit 20. The refrigerant that has performed the heating flows to the outdoor unit 20 along the liquid pipe 46, and flows into the outdoor heat exchanger 24 through the outdoor expansion device 32. The refrigerant absorbed by latent heat in the outdoor heat exchanger 24 joins the refrigerant flowing along the low pressure engine 44 and is sucked to the suction side of the compressor 22.

By the way, in the conventional air-conditioning simultaneous multi air conditioner, the distributor 40 is usually installed on the ceiling of the building, and the high pressure valve 43 and the low pressure valve 45 is detected when the damage and / or failure occurs, Since no means is provided, even when the driving of the compressor 22 is stopped due to the failure of the high pressure valve 43 and / or the low pressure valve 45, the cause of the stop of the operation of the compressor 22 is caused by the outdoor unit 20. There is a problem that it takes a lot of time and effort to cause and resolve the failure due to trial and error, such as replacing the parts of the outdoor unit 20 is mistaken for a failure of.

Accordingly, it is an object of the present invention to provide a valve failure detection device and a failure detection method for a simultaneous heating and cooling type multi air conditioner which can easily recognize a failure of a valve and quickly return to normal operation without trial and error.

According to the present invention, the present invention provides a plurality of indoor units having an indoor heat exchanger disposed indoors, an outdoor unit having a compressor and an outdoor heat exchanger, and a refrigerant according to the cooling operation and heating operation state of each indoor unit. Valve failure of the simultaneous heating and cooling type multi air conditioner having a distributor connected between the indoor unit and the outdoor unit having a high pressure valve and a low pressure valve to open and close the high pressure engine and the low pressure engine, respectively A detection apparatus, comprising: a high pressure side temperature sensor disposed upstream of the high pressure valve along a flow direction of a refrigerant during a heating operation to detect a temperature of the high pressure engine; A low pressure side temperature sensor disposed at a downstream side of the low pressure valve along a flow direction of the refrigerant during a cooling operation so as to detect the temperature of the low pressure engine; Achievement by the valve failure detection device of the simultaneous heating and cooling type multi air conditioner, characterized in that it comprises a fault detection unit for determining whether the high pressure valve and the low pressure valve is abnormal based on the detection result of the high pressure side temperature sensor and the low pressure side temperature sensor. do.

Here, when the temperature difference detected by each of the high pressure side temperature sensor and the low pressure side temperature sensor during the cooling operation is less than the first value, it is preferable that the fault detection unit is configured to determine that the failure of the high pressure valve.

The discharge side and the suction side of the compressor is effectively provided with a discharge side pressure sensor and a suction side pressure sensor so as to detect the internal pressure.

Preferably, the apparatus further includes a pressure conversion temperature calculation unit for calculating an evaporation pressure conversion temperature in which the evaporation pressure detected by the suction side pressure sensor is converted into a temperature.

The fault detection unit calculates the temperature and the pressure conversion temperature detected by the low pressure side temperature sensor when the temperature difference respectively detected by the high pressure side temperature sensor and the low pressure side temperature sensor exceeds the first value during the cooling operation. When the difference in the evaporation pressure conversion temperature calculated by the negative part is greater than or equal to the second value, it is effective to configure the low pressure valve to be determined as a failure.

The pressure conversion temperature calculation unit preferably calculates a condensation pressure conversion temperature obtained by converting the condensation pressure detected by the discharge side pressure sensor into a temperature during heating operation.

The fault detection unit is configured to determine the failure of the high pressure valve when there is a difference between the temperature detected by the high pressure side temperature sensor and the condensation pressure conversion temperature calculated by the pressure conversion temperature calculating unit during a heating operation. It is effective.

The fault detection unit may have a difference between a temperature detected by the high pressure side temperature sensor and a condensation pressure conversion temperature converted by the pressure conversion temperature calculating unit is less than the third value, and provided to the high pressure side temperature sensor and the low pressure side temperature sensor. It is preferable to configure so that it may determine that the said low pressure valve is faulty when the difference of the temperature detected by each is below 4th value.

A display unit for displaying predetermined information to the outside, and the display unit to externally display a failure state of the high pressure valve and the low pressure valve when at least one of the high pressure valve and the low pressure valve fails based on a detection result of the failure detection unit. It is effective to further include a control unit for controlling.

The display unit is preferably configured to be provided in the outdoor unit.

On the other hand, according to another field of the present invention, a plurality of indoor units having an indoor heat exchanger disposed in the room, an outdoor unit having a compressor and an outdoor heat exchanger, and a refrigerant according to the cooling operation and heating operation state of each indoor unit A valve of a simultaneous heating and cooling type multi air conditioner having a distributor connected between the indoor unit and the outdoor unit, including a high pressure engine and a low pressure engine and a liquid pipe, a high pressure valve and a low pressure valve to open and close the high pressure engine and the low pressure engine, respectively, to be provided. A fault detection method, comprising: detecting temperatures of a high pressure engine and a low pressure engine inside the distributor; According to the detected temperature of the high-pressure engine and the low-pressure engine, there is provided a valve failure detection method of the air-conditioning simultaneous multi air conditioner comprising the step of determining whether the high-pressure valve and the low-pressure valve.

Here, in the step of determining whether the high pressure valve and the low pressure valve failure, it is preferable to determine that the high pressure valve is a failure when the difference between the high pressure side temperature and the low pressure side temperature detected during the cooling operation is less than the first value.

Before the step of determining whether the high pressure valve and the low pressure valve failure, it is effective to further include the step of detecting the discharge side and the suction side pressure of the compressor, respectively.

In the step of determining whether the high pressure valve and the low pressure valve failure, the difference between the high pressure side temperature and the low pressure side temperature detected during the cooling operation exceeds the first value, the detected low pressure side temperature and the suction side of the compressor When the difference in temperature converted from the pressure is greater than or equal to the second value, it is preferable to determine the failure of the low pressure valve.

In determining whether the high pressure valve and the low pressure valve are faulty, when the difference between the high pressure side temperature detected during heating operation and the condensation pressure conversion temperature converted from the discharge side pressure of the compressor is equal to or greater than a third value, Judgment is effective.

In the determining of whether the high pressure valve and the low pressure valve is faulty, the difference between the high pressure side temperature and the condensation pressure conversion temperature detected during heating operation is less than the third value, and the detected high pressure side temperature and the low pressure side temperature difference In the case of the fourth value or less, it is preferable to determine that the low pressure valve is faulty.

After the step of determining whether the high-pressure valve and the low-pressure valve is broken, it is effective to further include a failure display step of displaying the external failure when at least one of the high-pressure valve and the low-pressure valve.

In the fault display step, it is preferable to display the fault conditions of the high pressure valve and the low pressure valve to the outside using time information.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

Figure 3 is a block diagram showing a state of use of the valve failure detection device of the simultaneous heating and cooling simultaneous multi-type air conditioner according to an embodiment of the present invention, Figure 4 is a control block of the valve failure detection apparatus of the simultaneous heating and cooling type multiple air conditioner of Figure 3 5 to 8 are diagrams for explaining the failure state of the high pressure valve and the low pressure valve of Figure 3, respectively, Figure 9 is a valve failure detection method of the simultaneous heating and cooling multi-type air conditioner according to an embodiment of the present invention It is a flowchart for explanation. The same reference numerals and the same components as the above-described and illustrated configurations are denoted by the same reference numerals for convenience of description, and detailed description thereof will be omitted. As shown in these figures, the valve failure detection device of the air-conditioning simultaneous multi air conditioner is an upstream side of the high pressure valve 43 along the flow direction of the refrigerant during the heating operation so as to detect the temperature of the high pressure engine 42. The high pressure side temperature sensor 51 disposed on the low pressure side temperature sensor 53 disposed downstream of the low pressure valve 45 along the flow direction of the refrigerant during the cooling operation so as to detect the temperature of the low pressure engine 44. And a fault detection unit 63 for determining whether the high pressure valve 43 and the low pressure valve 45 are abnormal based on the detection results of the high pressure side temperature sensor 51 and the low pressure side temperature sensor 53. It is.

As described above, the air-conditioning simultaneous multi air conditioner includes a plurality of indoor units 10 each provided with an indoor heat exchanger 11 and an indoor expansion device 13, a compressor 22, and an outdoor heat exchanger 24. It consists of the outdoor unit 20, the distributor 40 provided with the high pressure engine 42, the low pressure engine 44, the liquid pipe 46, the high pressure valve 43, and the low pressure valve 45. As shown in FIG.

On the discharge side of the compressor 22, a switching valve 26 for switching the flow path of the refrigerant is provided, and an accumulator 28 is connected to the suction side. An outdoor heat exchanger 24 is connected to the switching valve 26, and a check valve 34 and an outdoor expansion device 32 are provided on one side of the outdoor heat exchanger 24 along the refrigerant flow direction. One side of the outdoor heat exchanger 24 is provided with a blowing fan 30 to increase the heat exchange.

On the other hand, a discharge side pressure sensor 55 is provided on the discharge side of the compressor 22 to detect the discharge side pressure of the refrigerant, and a suction side pressure sensor 57 is provided on the suction side to detect the suction side pressure of the refrigerant. have.

Each of the high pressure engines 42 inside the distributor 40 is provided with a high pressure side temperature sensor 51 so as to detect the upstream side temperature of the high pressure valve 43 along the flow direction of the refrigerant during the heating operation. The low pressure engine 44 is provided with a low pressure side temperature sensor 53 so as to detect the downstream temperature of each low pressure valve 45 along the flow direction of the refrigerant during the cooling operation.

The control unit 61, which is usually implemented in the form of a microcomputer in which a control program is embedded, has a high pressure valve 43 based on the temperature of the high pressure engine 42 and the low pressure engine 44 and the pressures of the suction and discharge sides of the compressor 22. And a failure detecting unit 63 and a pressure conversion temperature calculating unit 65 so as to detect a failure state of the low pressure valve 45 and display it to the outside, and each of the high pressure engine 42 and the low pressure engine 44 And the high pressure side temperature sensor 51 and the low pressure side temperature sensor 53 for detecting the temperature of c), and the discharge side pressure sensor 55 and the suction side pressure sensor for detecting the pressures at the discharge side and the suction side of the compressor 22, respectively. 57 and a display portion 67 for displaying predetermined information on the outside are electrically connected to each other. Here, the display unit 67 is configured to display the visual information and to be provided in the outdoor unit 20.

Referring to FIGS. 3 and 9, a valve failure detection method of a cooling / cooling simultaneous multi-air conditioner using the valve failure detection device of the present air-conditioning simultaneous multi-air conditioner having such a mechanical characteristic will be described.

When the operation is started, the control unit 61 controls the high pressure side temperature sensor 51 and the low pressure side temperature sensor 53 to control the high pressure side temperature T ₁ and the low pressure side temperature of the high pressure engine 42 and the low pressure engine 44. T ₂ is detected (S10), and the discharge side pressure sensor 55 and the suction side pressure sensor 57 are controlled so that the discharge side pressure and the suction side pressure of the compressor 22 are respectively detected (S20).

When the temperature and the pressure are detected, it is checked whether the cooling operation is performed (S30), and during the cooling operation, the difference between the detected high pressure side temperature T ₁ and the low pressure side temperature T ₂ is equal to or less than the first value T _S1 ( S40, the failure detection unit 63 determines that the high pressure valve 43 is broken (S50).

Here, as shown in Figure 5, when the leakage caused by the failure of the high-pressure valve 43, the high-temperature high-pressure refrigerant of the high-pressure engine 42 flows into the low-pressure engine 44 of the low-pressure engine 44 The temperature, i.e., the low pressure side temperature T ₂ , rises and the high pressure side temperature T ₁ detected by the high pressure side temperature sensor 51 and the low pressure side temperature T ₂ detected by the low pressure side temperature sensor 53. ) Becomes almost the same. Therefore, when the difference between the high pressure side temperature T ₁ and the low pressure side temperature T ₂ is less than or equal to the first value T _S1 (about 3 degrees), it can be seen that the high pressure valve 43 is broken.

When the detected difference between the high pressure side temperature T ₁ and the low pressure side temperature T ₂ exceeds the first value T _S1 (S40), the control unit 61 controls the pressure conversion temperature calculating unit 65. The suction side pressure detected by the suction side pressure sensor 57, that is, the evaporation pressure conversion temperature T ₃ converted from the evaporation pressure into temperature is calculated (S60). When the evaporation pressure conversion temperature (T ₃ ) is calculated (S60), when the difference is more than the second value (T _S2 ) (about 0.5 to 1 degree) or more compared with the low pressure side temperature (T ₂ ) (S70) Fault detection unit 63 ) Is determined as a failure of the low pressure valve 45 (S80). In this case, when the low pressure valve 45 fails to open the flow path due to a failure, as shown in FIG. 6, the flow of the coolant is stopped to cause congestion of the coolant so that the low pressure side temperature T ₂ rises. do. Therefore, when the difference between the evaporation pressure conversion temperature (T ₃ ) and the low pressure side temperature (T ₂ ) occurs it can be seen that the low pressure valve 45 is broken.

On the other hand, during heating operation, the control unit 61 controls the pressure conversion temperature calculation unit 65 to calculate the condensation pressure conversion temperature T ₄ from the discharge side pressure, that is, the condensation pressure (S90), and the high pressure side temperature (T _1). ) And the difference between the condensation pressure conversion temperature T ₄ and the third value T _S3 (about 0.5 degree to 1 degree) or more (S100), the failure detection unit 63 determines that the high pressure valve 43 is broken ( S110). Here, when the flow path of the high-pressure engine 42 is not opened due to a failure of the high-pressure valve 43 during the heating operation, as shown in FIG. 7, the refrigerant is stagnant and condensed, so that the high-pressure side temperature T ₁ is It descends and the backflow refrigerant | coolant accumulates in the indoor heat exchanger (11). Therefore, when the difference between the condensation pressure conversion temperature (T ₄ ) and the high pressure side temperature (T ₁ ) occurs it can be seen that the high-pressure valve 43 is broken.

The failure detection unit 63 is the high pressure side temperature (T ₁ ) and the low pressure side temperature (T ₂ ) when the difference between the condensation pressure conversion temperature (T ₄ ) and the high pressure side temperature (T ₁ ) is less than the third value (T _S3 ) (S100). If the difference is less than or equal to the fourth value (about 3 degrees) (S120), the failure detection unit 63 determines that the low pressure valve 45 is broken (S130). Here, when the flow path of the low pressure engine 44 is not closed due to a failure of the low pressure valve 45 during heating operation, as shown in FIG. 8, the refrigerant in the high pressure engine 42 is stored in the low pressure engine 44. Inflow to the high pressure side temperature (T ₁ ) and low pressure side temperature (T ₂ ) is almost the same because it can be seen that the low pressure valve 45 is broken.

On the other hand, when failure of the high pressure valve 43 and / or the low pressure valve 45 is detected by the failure detection unit 63 (S50, S80, S110, S130), the control unit 61 displays the high pressure by the display unit 67. The failure state of the valve 43 and / or the low pressure valve 45 is displayed externally as visual information (S140).

As described above, according to the present invention, the high-pressure side temperature sensor disposed on the upstream side of the high-pressure valve along the flow direction of the refrigerant during the heating operation so as to detect the temperature of the high-pressure engine and the temperature of the low-pressure engine can be detected. To determine the abnormality of the high pressure valve and the low pressure valve on the basis of the detection results of the low pressure side temperature sensor and the high pressure side temperature sensor and the low pressure side temperature sensor which are disposed downstream of the low pressure valve along the flow direction of the refrigerant during the cooling operation. By including a failure detection unit, it is possible to easily recognize the failure of the valve is provided a valve failure detection device of the air-conditioning simultaneous multi air conditioner that can be quickly returned to normal operation without trial and error.

In addition, according to the present invention, the step of detecting the temperature of the high-pressure engine and the low-pressure engine in the distributor, respectively, and the step of determining whether the high-pressure valve and the low-pressure valve failure based on the detected temperature of the high-pressure engine and low-pressure engine By providing a valve failure detection method of a simultaneous heating and cooling type multi air conditioner which can easily recognize a failure of the valve and can quickly return to normal operation without trial and error.

1 is a configuration diagram of a conventional air-conditioning simultaneous multi air conditioner,

2 is a view illustrating a heating main operation of the air-conditioning simultaneous multi air conditioner of FIG. 1;

3 is a block diagram showing a state of use of the valve failure detection device of the air-conditioning simultaneous multi air conditioner according to an embodiment of the present invention,

4 is a control block diagram of a valve failure detection apparatus of the air-conditioning simultaneous multi air conditioner of FIG. 3;

5 to 8 are views for explaining a failure state of the high pressure valve and the low pressure valve of Figure 3, respectively;

9 is a flowchart illustrating a valve failure detection method of a simultaneous heating and cooling type multi air conditioner according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: indoor unit 11: indoor heat exchanger

13: indoor expansion device 20: outdoor unit

22 compressor 24 outdoor heat exchanger

26: switching valve 32: outdoor expansion device

40: distributor 42: high pressure engine

43: high pressure valve 44: low pressure engine

45: low pressure valve 46: liquid pipe

51: high pressure side temperature sensor 53: low pressure side temperature sensor

55: discharge side pressure sensor 57: suction side pressure sensor

61 control unit 63 fault detection unit

65: pressure conversion temperature calculation unit 67: display unit

Claims (18)

A plurality of indoor units having an indoor heat exchanger disposed indoors, an outdoor unit having a compressor and an outdoor heat exchanger, a high pressure engine and a low pressure engine so that refrigerant can be appropriately provided according to the cooling operation and the heating operation state of each indoor unit; In the valve failure detection apparatus of the simultaneous heating and cooling type multi air conditioner having a liquid pipe, a high pressure valve and a low pressure valve for opening and closing the high pressure engine and the low pressure engine, respectively, and connected between the indoor unit and the outdoor unit, A high pressure side temperature sensor disposed upstream of the high pressure valve along a flow direction of the refrigerant during a heating operation to detect a temperature of the high pressure engine; A low pressure side temperature sensor disposed at a downstream side of the low pressure valve along a flow direction of the refrigerant during a cooling operation so as to detect the temperature of the low pressure engine; And a fault detection unit for determining whether the high pressure valve and the low pressure valve are abnormal based on the detection results of the high pressure side temperature sensor and the low pressure side temperature sensor. The method of claim 1, The fault detection unit, when the temperature difference detected by the high pressure side temperature sensor and the low pressure side temperature sensor during the cooling operation is less than the first value, the air-conditioning simultaneous multi-air conditioner Valve fault detection device. The method of claim 2, And a discharge side pressure sensor and a suction side pressure sensor are respectively provided at the discharge side and the suction side of the compressor to detect the internal pressure. The method of claim 3, And a pressure conversion temperature calculation unit for calculating an evaporation pressure conversion temperature in which the evaporation pressure detected by the suction side pressure sensor is converted into a temperature. The method of claim 4, wherein The fault detection unit calculates the temperature and the pressure conversion temperature detected by the low pressure side temperature sensor when the temperature difference respectively detected by the high pressure side temperature sensor and the low pressure side temperature sensor exceeds the first value during the cooling operation. The valve failure detection device of the simultaneous heating and cooling type multi air conditioner, characterized in that the low-pressure valve is determined that the difference between the evaporation pressure conversion temperature calculated by the negative value. The method of claim 4, wherein And the pressure conversion temperature calculating unit calculates a condensation pressure conversion temperature obtained by converting the condensation pressure detected by the discharge side pressure sensor into a temperature during heating operation. The method of claim 6, The fault detection unit may determine that the high pressure valve is malfunctioning when there is a difference between a temperature detected by the high pressure side temperature sensor and a condensation pressure conversion temperature calculated by the pressure conversion temperature calculating unit during a heating operation. Breakdown detection device of simultaneous air-conditioning type multi air conditioner. The method of claim 7, wherein The fault detection unit may have a difference between a temperature detected by the high pressure side temperature sensor and a condensation pressure conversion temperature converted by the pressure conversion temperature calculating unit is less than the third value, and provided to the high pressure side temperature sensor and the low pressure side temperature sensor. And detecting the failure of the low pressure valve when the difference between the temperatures detected by the fourth value is equal to or less than the fourth value. The method according to any one of claims 1 to 8, A display unit for displaying predetermined information to the outside, and the display unit to externally display a failure state of the high pressure valve and the low pressure valve when at least one of the high pressure valve and the low pressure valve fails based on a detection result of the failure detection unit. Valve failure detection device of the air-conditioning simultaneous multi air conditioner, characterized in that it further comprises a control unit for controlling. The method of claim 10, The display unit is a failure detection device of the air-conditioning simultaneous multi air conditioner, characterized in that provided in the outdoor unit. A plurality of indoor units having an indoor heat exchanger disposed indoors, an outdoor unit having a compressor and an outdoor heat exchanger, a high pressure engine and a low pressure engine so that refrigerant can be appropriately provided according to the cooling operation and the heating operation state of each indoor unit; In the valve failure detection method of the air-conditioning simultaneous multi-air conditioner having a liquid pipe, a high pressure valve for opening and closing the high pressure engine and the low pressure engine, and a distributor connected between the indoor unit and the outdoor unit, Detecting temperatures of the high pressure engine and the low pressure engine inside the distributor; And determining whether the high pressure valve and the low pressure valve have failed based on the detected temperatures of the high pressure engine and the low pressure engine. The method of claim 11, In the step of determining whether the high pressure valve and the low pressure valve failure, if the difference between the high pressure side temperature and the low pressure side temperature detected during the cooling operation is less than the first value, the heating and cooling simultaneous type characterized in that it is determined as the failure of the high pressure valve Valve failure detection method of multi air conditioner. The method of claim 12, Before the step of determining whether the high-pressure valve and the low-pressure valve failure, the valve failure detection method of the simultaneous heating and cooling multiple air conditioner, characterized in that further comprising the step of detecting the pressure of the discharge side and the suction side of the compressor. The method of claim 13, In the step of determining whether the high pressure valve and the low pressure valve failure, the difference between the high pressure side temperature and the low pressure side temperature detected during the cooling operation exceeds the first value, the detected low pressure side temperature and the suction side of the compressor When the difference in temperature converted from the pressure is greater than or equal to the second value, the failure detection method of the simultaneous heating and cooling type multiple air conditioner, characterized in that the low-pressure valve is determined to fail. The method of claim 13, In determining whether the high pressure valve and the low pressure valve are faulty, when the difference between the high pressure side temperature detected during heating operation and the condensation pressure conversion temperature converted from the discharge side pressure of the compressor is equal to or greater than a third value, Failure detection method of the simultaneous heating and cooling multi-type air conditioner characterized in that judging. The method of claim 15, In the determining of whether the high pressure valve and the low pressure valve is faulty, the difference between the high pressure side temperature and the condensation pressure conversion temperature detected during heating operation is less than the third value, and the detected high pressure side temperature and the low pressure side temperature difference If the fourth value is less than the failure detection method of the air-conditioning simultaneous multi air conditioner, characterized in that it is determined that the low-pressure valve failure. The method according to any one of claims 11 to 16, After the step of determining whether the high-pressure valve and the low-pressure valve failure, at least one of the high-pressure valve and the low-pressure valve when the failure indication step of displaying the external to the multi-air conditioner characterized in that it further comprises How to detect valve failure. The method of claim 17, In the fault display step, the fault detection method of the simultaneous heating and cooling type air conditioner, characterized in that the failure state of the high-pressure valve and the low-pressure valve is displayed to the outside using the time information.