JP2000304388A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of comfortableness and the breakage of a compressor due to the performance deterioration of an air conditioner by comparing the piping temperature near the outlet of the compressor when a refrigerant is insufficient while the conditioner is operated for cooling with the piping temperature near the output of the compressor at normal time calculated through cycle simulation and accurately discriminating the insufficiency of the enclosed quantity of the refrigerant under all conditions of installation based on the correlation between the compared results and the quantity of the refrigerant enclosed in a refrigerating cycle. SOLUTION: An air conditioner is provided with an analyzing means 13 which simulates the refrigerating cycle characteristics of the air conditioner in a normal refrigerating cycle state at outdoor and indoor temperatures, an enclosed refrigerant quantity discriminating means 14 which discriminates the insufficiency of the enclosed quantity of the refrigerant based on the correlation between the piping temperature at the outlet of a compressor digitized by means of a temperature computing means 11 and the piping temperature at the outlet of the compressor at normal time calculated by means of the analyzing means 13, and a timer means 9 which periodically actuates the means 13 and 14. Therefore, the deterioration of comfortableness and the breakage of the compressor due to a decline in performance of the air conditioner can be prevented by accurately discriminating the insufficiency of the refrigerant under all conditions of installation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for detecting a shortage of refrigerant.

[0002]

2. Description of the Related Art Various developments have been already made for abnormality diagnosis of air conditioners.
The basic technology of an air conditioner as disclosed in Japanese Patent No. 247442 will be described below.

As shown in FIG. 9, the above conventional air conditioner has a room temperature sensor 1 for detecting a room temperature on the indoor side.
A test operation switch 2 for issuing a test operation instruction is provided, and an outdoor air temperature sensor 6 for detecting an outdoor temperature, a compressor 7 and an expansion valve 8 constituting a refrigeration cycle, an outdoor fan motor 10, and a compressor 7 are provided on the outdoor side. A discharge gas temperature sensor 9 for detecting the temperature of the discharge gas is provided. The control circuit 12 controls the compressor 7, the expansion valve 8, and the outdoor fan motor 10 based on the values of the room temperature sensor 1, the discharge gas temperature sensor 9, and the outside air temperature sensor 6. Operation control.

The operation of the air conditioner configured as described above will be described.

[0005] In the cooling operation, the data of the discharge gas temperature when the refrigerant leaks is compared with the temperature characteristic that the discharge gas temperature rises when the refrigerant decreases based on the experimental value. The inappropriate amount is determined at the time of trial run. Further, by taking into account the difference in temperature characteristics due to the difference in outside air temperature, it is possible to determine the appropriate amount and the inappropriate amount of the refrigerant charging amount according to the outside air temperature at the time of installation.

[0006]

However, in the above-mentioned conventional configuration, the shortage of the amount of the charged refrigerant is determined based on the correlation between the discharge gas temperature, the outside air temperature, and the experimental value of the refrigerant amount. There is a problem that it is not possible to accurately determine the shortage of the amount of the charged refrigerant due to a difference or a difference in the installation environment such as operating horsepower, and it is limited to a trial operation.

In view of the above problems, the present invention compares the pipe temperature near the compressor outlet when the refrigerant is insufficient during the cooling operation with the pipe temperature near the compressor outlet during normal operation calculated by cycle simulation. Based on the correlation with the amount of refrigerant charged in the cycle, it is possible to accurately judge the lack of refrigerant charge under any installation conditions, and to prevent loss of comfort due to reduced capacity and damage to the compressor. The purpose is.

Another object of the present invention is to prevent erroneous detection in the refrigerant shortage determination by determining that the refrigerant is short only when the pipe temperature near the compressor outlet at the time of the refrigerant shortage determination has continued for a predetermined time.

[0009] Further, based on the degree of supercooling in the pipe near the inlet of the indoor unit when the refrigerant is insufficient, the temperature of the pipe near the outlet of the compressor, and the normal degree of supercooling calculated by cycle simulation and the temperature of the pipe at the compressor outlet, the refrigerant shortage is determined. An object of the present invention is to determine an abnormality of a compressor, notify a compressor failure, and prevent a worst-case disaster such as a fire.

[0010]

In order to achieve this object, the present invention provides an outlet pipe temperature sensor for detecting a temperature of an outlet pipe of a compressor, and an outlet pipe for digitizing an output signal of the outlet pipe temperature sensor. Temperature calculating means, an outside air temperature sensor for detecting an outside air temperature, an outside air temperature calculating means for quantifying an output signal of the outside air temperature sensor, an indoor temperature sensor for detecting an indoor temperature, and an output signal of the indoor temperature sensor. A room temperature calculating means to be quantified, and a refrigeration cycle in a normal state of the refrigerant cycle at the outside air temperature quantified by the outside air temperature calculating means and the room temperature quantified by the indoor temperature calculating means during the cooling operation. Analysis means for performing cycle simulation of characteristics; and, during cooling operation, the compressor outlet pipe temperature quantified by the outlet pipe temperature calculation means and calculated by the analysis means. The refrigerant charging amount determining means for determining the shortage of the refrigerant charging amount based on the correlation between the compressor outlet piping temperature and the refrigerant charging amount during normal operation, and the refrigerant charging amount determining means has determined that the refrigerant charging amount is insufficient. Sometimes, an abnormality display means for displaying the refrigerant shortage abnormality is provided.

[0011] This makes it possible to accurately detect the shortage of the refrigerant amount in any installation environment, to prevent a decrease in comfort due to a decrease in performance, and to prevent damage to the compressor before repair cost can be reduced.

Further, the present invention provides an outlet pipe temperature sensor for detecting a temperature of an outlet pipe of a compressor, an outlet pipe temperature calculating means for quantifying an output signal of the outlet pipe temperature sensor,
While storing each numerical value of the compressor outlet pipe temperature digitized by the outlet pipe temperature calculating means during a predetermined time,
Memory means for calculating an average value of each numerical value of the compressor outlet pipe temperature stored during the predetermined time; an outside air temperature sensor for detecting an outside air temperature; and an outside air for quantifying an output signal of the outside air temperature sensor. Temperature calculating means, an indoor temperature sensor for detecting an indoor temperature, an indoor temperature calculating means for quantifying an output signal of the indoor temperature sensor, and an outside air temperature quantified by the outside air temperature calculating means during a cooling operation. Analysis means for performing a cycle simulation of a refrigeration cycle characteristic in a normal state of the refrigeration cycle with the indoor temperature quantified by the indoor temperature calculation means, and the compressor outlet pipe temperature calculated by the memory means during a cooling operation. Is determined based on the average value of 値 and the correlation between the compressor outlet pipe temperature at normal time and the refrigerant charge calculated by the analysis means. Means, the refrigerant charging amount determining means when it is determined the lack of the refrigerant charging amount, constituted an abnormality display means for displaying the refrigerant shortage abnormality.

In this way, it is determined that the refrigerant is insufficient only when the rise of the outlet pipe temperature of the compressor at the time of the refrigerant shortage determination has continued for a certain period of time, so that irregular detection of the pipe temperature due to a sudden disturbance is prevented, and the refrigerant shortage is prevented. Erroneous detection of the determination can be prevented.

The present invention also provides an outlet pipe temperature sensor for detecting a pipe degree at an outlet of a compressor, an outlet pipe temperature calculating means for quantifying an output signal of the outlet pipe temperature sensor, and an outside air temperature for detecting an outside air temperature. A temperature sensor; an outside air temperature calculating means for quantifying an output signal of the outside air temperature sensor; an indoor temperature sensor for detecting an indoor temperature; an indoor temperature calculating means for quantifying an output signal of the indoor temperature sensor; Inside, a supercooling sensor for detecting a degree of subcooling of a pipe near an inlet of an indoor unit having an indoor heat exchanger, a supercooling calculation unit for quantifying an output signal of the supercooling sensor, and a cooling operation, Based on the degree of supercooling quantified by the supercooling calculation means and the correlation between the degree of supercooling of the pipe near the inlet of the indoor unit and the degree of refrigerant charge calculated in the normal state calculated by the analysis means, the amount of refrigerant charge The refrigerant charging amount determining means for determining a foot, and when the refrigerant charging amount determining means determines that the refrigerant charging amount is insufficient, the compressor outlet pipe temperature quantified by the outlet pipe temperature calculating means based on the compressor outlet pipe temperature. Abnormality determining means for determining the presence or absence of an abnormality in the compressor, and after the refrigerant charging amount determining means has determined that the refrigerant charging amount is insufficient, a refrigerant shortage abnormality is determined when the abnormality determining means determines that the compressor is normal. And an abnormality display means for displaying the compressor abnormality when the abnormality determination means determines that the compressor is abnormal.

[0015] Accordingly, the refrigerant shortage is determined based on the degree of supercooling in the pipes near the indoor unit inlet when the refrigerant is insufficient, the outlet pipe temperature of the compressor, and the normal degree of supercooling and the outlet pipe temperature of the compressor calculated by cycle simulation. And an abnormality of the compressor are determined, and a failure of the compressor is notified to prevent a worst-case disaster such as a fire.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to a first aspect of the present invention is directed to an outlet pipe temperature sensor for detecting a temperature of an outlet pipe of a compressor, and an outlet pipe temperature calculating means for quantifying an output signal of the outlet pipe temperature sensor. An outside air temperature sensor that detects an outside air temperature, an outside air temperature calculation unit that quantifies an output signal of the outside air temperature sensor, and an indoor temperature sensor that detects an indoor temperature.
An indoor temperature calculating means for converting the output signal of the indoor temperature sensor into a numerical value, and freezing between the outside air temperature quantified by the outside air temperature calculating means and the indoor temperature quantified by the indoor temperature calculating means during the cooling operation. Analysis means for performing cycle simulation of a refrigeration cycle characteristic in a normal state of a cycle, and, during a cooling operation, the compressor outlet pipe temperature quantified by the outlet pipe temperature calculation means and the normal state calculated by the analysis means. A refrigerant charging amount determining unit that determines the shortage of the refrigerant charging amount based on the correlation between the compressor outlet pipe temperature and the correlation between the refrigerant charging amount, and a refrigerant when the refrigerant charging amount determining unit determines that the refrigerant charging amount is insufficient. An abnormality display means for displaying a shortage abnormality, during cooling operation, inputs the outlet pipe temperature of the compressor detected by the temperature sensor, the outside air temperature and the room temperature, and inputs the air conditioning. The analysis means for performing a cycle simulation of the refrigeration cycle characteristics at the time of normal operation of the compressor, and the outlet pipe temperature of the compressor obtained from the analysis means, and the detected pipe temperature are compared with each other, thereby being dependent on the difference in the outside air temperature. It is possible to accurately determine the shortage of the amount of charged refrigerant without performing the operation, and to notify the user of the occurrence of an abnormality and the appropriate amount of additional refrigerant to a service person before the compressor is damaged.

An outlet pipe temperature sensor for detecting the temperature of the outlet pipe of the compressor, an outlet pipe temperature calculating means for quantifying an output signal of the outlet pipe temperature sensor, The numerical value of the compressor outlet pipe temperature digitized by the outlet pipe temperature calculating means is stored, and an average value of the respective values of the compressor outlet pipe temperature stored during the predetermined time is calculated. A memory unit, an outside air temperature sensor for detecting an outside air temperature, an outside air temperature calculating unit for quantifying an output signal of the outside air temperature sensor, an indoor temperature sensor for detecting an indoor temperature, and a numerical value for an output signal of the indoor temperature sensor. And a normal refrigeration cycle between the outside air temperature quantified by the outside air temperature calculation means and the indoor temperature quantified by the indoor temperature calculation means during the cooling operation. Analysis means for performing cycle simulation of the refrigerating cycle characteristics of the state; and, during a cooling operation, an average value of the compressor outlet pipe temperature calculated by the memory means and a normal compressor outlet pipe temperature calculated by the analysis means. And a refrigerant enclosing amount judging unit for judging the shortage of the refrigerant enclosing amount based on the correlation between the refrigerant enclosing amount and the refrigerant enclosing amount judging unit. It consists of abnormality display means, during cooling operation,
In order to determine whether the rise in the pipe temperature near the compressor outlet detected by the compressor outlet pipe temperature sensor is due to lack of refrigerant, store the outlet pipe temperature of the compressor for a certain period of time, The averaging has the effect of preventing erroneous detection of refrigerant shortage.

According to a third aspect of the present invention, there is provided an outlet pipe temperature sensor for detecting a temperature of an outlet pipe of a compressor, an outlet pipe temperature calculating means for digitizing an output signal of the outlet pipe temperature sensor, and detecting an outside air temperature. An outside air temperature sensor, an outside air temperature calculating means for quantifying an output signal of the outside air temperature sensor, an indoor temperature sensor for detecting an indoor temperature, and an indoor temperature calculating means for quantifying an output signal of the indoor temperature sensor,
During the cooling operation, a supercooling sensor for detecting a degree of subcooling of the pipe near the inlet of the indoor unit having the indoor heat exchanger, a supercooling operation unit for quantifying an output signal of the supercooling sensor, and The refrigerant is charged based on the degree of subcooling quantified by the subcooling calculation means and the correlation between the degree of refrigerant cooling and the pipe supercooling degree near the inlet of the indoor unit at normal time calculated by the analysis means. Means for judging a shortage of the refrigerant amount, and a method for judging the shortage of the amount of refrigerant when the refrigerant enclosing amount judgment means judges the shortage of the amount of refrigerant based on the compressor outlet pipe temperature quantified by the outlet pipe temperature calculating means. Abnormality determining means for determining the presence or absence of an abnormality in the compressor, and after the refrigerant charging amount determining means determines that the refrigerant charging amount is insufficient, the refrigerant shortage occurs when the abnormality determining means determines that the compressor is normal. Displays abnormalities When the determination means determines that the compressor is abnormal, the compressor includes abnormality display means for displaying a compressor abnormality.During the cooling operation, the outlet pipe temperature and the outside air temperature of the compressor detected by the outlet pipe temperature sensor. The analysis means for inputting the indoor temperature and performing cycle simulation of the refrigeration cycle characteristics of the air conditioner in a normal state; the degree of subcooling of the pipe near the indoor unit inlet obtained from the analysis means; By performing a comparison operation with, the shortage of the amount of charged refrigerant is accurately determined without depending on the difference in the outside air temperature.

Further, when the refrigerant is insufficient, the degree of subcooling of the pipe and the temperature of the pipe near the outlet of the compressor are compared to determine an abnormality of the compressor and notify the abnormality.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an air conditioner according to the present invention will be described below with reference to the drawings. Note that the same components as those of the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

(Embodiment 1) FIG. 1 is a refrigeration cycle diagram of an air conditioner according to Embodiment 1 of the present invention. In FIG. 1, a black arrow indicates the flow direction of the refrigerant during a normal cooling operation.
FIG. 2 is a flowchart of the embodiment, and FIG. 3 is a refrigerant amount characteristic diagram that characterizes the relationship between the compressor outlet temperature, the outside air temperature, and the refrigerant amount in the embodiment.

The air conditioner of this embodiment includes an outdoor unit A and an indoor unit B.

In FIG. 1, A is an outdoor unit, comprising a compressor 1, an outdoor blower 4, and an outdoor heat exchanger 3. B is an indoor unit, and an indoor heat exchanger 7, an indoor blower 8, The compressor 1, the outdoor heat exchanger 3, the indoor heat exchanger 7, and the compressor 1 are sequentially connected in an annular manner by a refrigerant pipe to form a cooling cycle for circulating the refrigerant.

Numeral 9 denotes timer means, which starts abnormality diagnosis of the air conditioner when a predetermined time elapses during the cooling operation. T
h0 is a compressor outlet pipe temperature sensor, which is installed near the compressor 1 outlet pipe. Th1 is an outside air temperature sensor, which is installed in the outdoor unit A. Th2 is an indoor temperature sensor, and the indoor heat exchanger 7 in the indoor unit B
Is installed near the entrance.

Numeral 10 denotes an outside air temperature calculating means, which digitizes the outside air temperature from a signal from the outside air temperature sensor Th1.

Reference numeral 11 denotes outlet pipe temperature calculating means for quantifying the temperature of the refrigerant pipe near the outlet of the compressor 1 from a signal from the outlet pipe temperature sensor Th0 of the compressor.

Numeral 12 denotes an indoor temperature calculating means, which digitizes the indoor temperature from a signal from the indoor temperature sensor Th2.

Numeral 13 denotes an analyzing means, which inputs the outside air temperature from the outside air temperature calculating means 10 and the room temperature from the indoor temperature calculating means 12 to obtain the normal capacity, input, circulating amount, temperature, and pressure of the air conditioner. Refrigeration cycle characteristics such as current and current value are calculated by cycle simulation. Numeral 14 is a refrigerant charging amount determining means for comparing and calculating the compressor outlet pipe temperature at normal time obtained by the analyzing means 13 and the compressor outlet pipe temperature at the time of detection obtained by the temperature calculating means 11, and The shortage of the refrigerant charge is determined from the correlation of the refrigerant charge.

Reference numeral 15 denotes an abnormality display means for displaying the refrigerant shortage abnormality and displaying an appropriate amount of refrigerant at the time of addition.

The operation of the air conditioner constructed as described above will now be described with reference to the flowchart of FIG.
This will be described with reference to the refrigerant quantity characteristic diagram of FIG.

In FIG. 2, in STEP 0, the air conditioner performs the normal cooling operation. In STEP1, the operation time is integrated by the timer means 9.

In STEP 2, when it is determined by the timer means 9 that the operation has been continued for a predetermined time, the temperature of the refrigerant in the outlet pipe of the compressor 1 is calculated by the temperature calculating means 11 based on the signal from the outlet pipe temperature sensor Th0. Numerical value (T = 8
5 ° C).

In STEP 3, the outside air temperature is quantified based on the signal from the outside air temperature sensor Th1 (TO = 35 ° C.), and the room temperature is quantified based on the signal from the room temperature sensor Th2 (TI = 27 ° C).

In STEP 4, the analysis means 13 performs a cycle simulation of the refrigeration cycle characteristics such as the capacity, input, circulating amount, temperature, pressure, current value, etc. under normal conditions from the outside air temperature TO and the room temperature TI (for example, compression by cycle simulation). Machine outlet pipe temperature T '= 105 ° C).

In STEP 5, the compressor outlet pipe temperature at normal time obtained by the analyzing means 13 (T '= 105 ° C.) and the compressor outlet pipe temperature at detection obtained by the temperature calculating means 11 (T = 85) Is calculated, and the refrigerant charging amount is determined to be insufficient from the correlation between the comparison result and the refrigerant charging amount.

That is, when the outlet pipe temperature T of the compressor at the time of detection is (Equation 1) with respect to the outlet pipe temperature T 'of the compressor in the normal state from the refrigerant amount characteristic diagram of FIG. 3, it is determined that the refrigerant amount is insufficient. .

[0037]

(Equation 1)

In STEP 6, the refrigerant charging amount determining means 14
If the refrigerant charging amount determined in step is insufficient, the abnormality display means 15 notifies the abnormality signal and the refrigerant shortage amount.

Thus, under any installation environment, it is possible to accurately detect the shortage of the refrigerant amount, to prevent a decrease in comfort due to a decrease in capacity and to prevent damage to the compressor before repair cost can be reduced.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to the drawings. The same components as those in Embodiment 1 will be assigned the same reference numerals and detailed description thereof will be omitted.

FIG. 4 is a refrigeration cycle diagram of an air conditioner according to Embodiment 2 of the present invention. In FIG. 4, black arrows indicate the flow direction of the refrigerant during normal cooling operation. FIG. 5 is a flowchart of the embodiment.

In FIG. 4, reference numeral 16 denotes a memory means.
The signal from the outlet pipe temperature sensor Th0 is stored for a certain period of time and averaged.

The operation of the air conditioner configured as described above will be described below with reference to the flowchart of FIG.

In FIG. 5, in STEP8, in STEP2
The compressor outlet pipe temperature T detected in the step is stored for a certain period of time and averaged.

In this way, it is determined that the refrigerant is inadequate only when the pipe temperature near the compressor outlet at the time of the refrigerant shortage determination has continued for a certain period of time. Can be prevented from being erroneously detected.

(Embodiment 3) Next, Embodiment 3 of the present invention will be described with reference to the drawings. The same components as in Embodiment 1 will be assigned the same reference numerals and detailed description thereof will be omitted.

FIG. 6 is a refrigeration cycle diagram of an air conditioner according to Embodiment 3 of the present invention. In FIG. 6, black arrows indicate the flow direction of the refrigerant during normal cooling operation. FIG. 7 is a flowchart of the embodiment, and FIG. 8 is a refrigerant amount characteristic diagram that characterizes the relationship among the compressor outlet pipe temperature, the outside air temperature, and the refrigerant amount of the embodiment.

In FIG. 6, Th3 is a subcooling sensor for detecting the degree of subcooling of the pipe near the entrance of the indoor unit B.

Numeral 17 denotes a supercooling calculating means for digitizing a signal from the supercooling sensor Th3. Numeral 18 is a refrigerant charging amount judging means for determining the degree of supercooling of the indoor unit inlet pipe at normal time obtained by the analyzing means 13 and the degree of supercooling of the indoor unit inlet pipe at the time of detection obtained by the supercooling calculating means 17. A comparison operation is performed, and a shortage of the refrigerant charge is determined from the correlation between the comparison result and the refrigerant charge.

Reference numeral 19 denotes an abnormality judging means, which is used only when the refrigerant amount judged by the refrigerant enclosing amount judging means is insufficient.
Of the compressor is determined from the correlation between the outlet pipe temperature of the indoor unit B and the degree of subcooling at the inlet of the indoor unit B.

Numeral 15 is an abnormality display means for displaying an abnormality of the refrigerant and an abnormality of the compressor.

The operation of the air conditioner configured as described above will be described below with reference to the flowchart of FIG.

In FIG. 7, in STEP 9, the degree of subcooling at the entrance of the indoor unit B is quantified based on the signal from the subcooling sensor Th3 (SC = 1K). In STEP10,
Cycle simulation of refrigeration cycle characteristics such as capacity, input, circulating amount, temperature, pressure, current value and the like at normal time is performed from the outside air temperature TO and the room temperature TI by the analysis means 13 (for example, the inlet unit subcooling of the indoor unit B by the cycle simulation). Degree SC '= 5K).

In STEP 11, the supercooling degree at normal time (SC '= 5K) obtained by the analyzing means 13 and the supercooling degree at detection (SC = 1K) are calculated, and the correlation between the comparison result and the refrigerant charging amount is calculated. From the relationship, it is determined that the refrigerant charging amount is insufficient.

That is, when the supercooling degree T in the detection is (Expression 2) with respect to the normal supercooling degree SC 'from the refrigerant amount characteristic diagram of FIG. 3, it is determined that the refrigerant amount is insufficient.

[0056]

(Equation 2)

In STEP 12, the refrigerant charging amount determining means 1
If the refrigerant charging amount determined in step 4 is insufficient, the compressor outlet pipe temperature T exceeds the predetermined value (T = 105 ° C.) and the compressor 1
Is determined to be normal, and if the compressor outlet pipe temperature T is equal to or lower than a predetermined value (T = 95 ° C.), it is determined that the compressor 1 is abnormal.

In STEP 13, the abnormality display means 15 notifies the signal of the refrigerant shortage abnormality, the refrigerant shortage amount, and the presence or absence of the abnormality of the compressor 1.

Thus, it is possible to determine the presence or absence of an abnormality of the compressor when the refrigerant is insufficient, and at worst, to prevent a disaster such as a fire caused by the compressor.

[0060]

As described above, according to the first aspect of the present invention, an outlet pipe temperature sensor for detecting a temperature of an outlet pipe of a compressor, and an outlet pipe temperature calculation for digitizing an output signal of the outlet pipe temperature sensor. Means, an outside air temperature sensor for detecting an outside air temperature, an outside air temperature calculating means for quantifying an output signal of the outside air temperature sensor, an indoor temperature sensor for detecting an indoor temperature, and quantification of an output signal of the indoor temperature sensor. Indoor temperature calculating means, and during a cooling operation, the refrigeration cycle characteristics in a normal state of the refrigeration cycle at the outside air temperature quantified by the outside air temperature calculating means and the indoor temperature quantified by the indoor temperature calculating means. Analysis means for performing cycle simulation; and, during the cooling operation, the compressor outlet pipe temperature quantified by the outlet pipe temperature calculation means and the normality calculated by the analysis means. Compressor outlet pipe temperature and a refrigerant charging amount determining means for determining the shortage of the refrigerant charging amount based on the correlation between the refrigerant charging amount, and when the refrigerant charging amount determining means determines the shortage of the refrigerant charging amount, By providing an abnormality display means for displaying an insufficient refrigerant abnormality, it is possible to accurately detect an insufficient amount of refrigerant under any installation environment, to prevent a decrease in comfort due to a decrease in capacity and to prevent damage to the compressor. This can reduce repair costs.

Further, the invention according to claim 2 is an outlet pipe temperature sensor for detecting the temperature of the outlet pipe of the compressor, an outlet pipe temperature calculating means for digitizing an output signal of the outlet pipe temperature sensor, and a predetermined time. While storing each numerical value of the compressor outlet pipe temperature digitized by the outlet pipe temperature calculating means, the average value of each numerical value of the compressor outlet pipe temperature stored during the predetermined time is calculated. Memory means for calculating, an outside air temperature sensor for detecting an outside air temperature, and an outside air temperature calculating means for quantifying an output signal of the outside air temperature sensor,
An indoor temperature sensor for detecting an indoor temperature, an indoor temperature calculating means for quantifying an output signal of the indoor temperature sensor, and an outside air temperature quantified by the outside air temperature calculating means and the indoor temperature calculating means during a cooling operation. Analysis means for performing cycle simulation of a refrigeration cycle characteristic in a normal state of the refrigeration cycle with the indoor temperature quantified in, and, during cooling operation, an average value of the compressor outlet pipe temperature calculated by the memory means and the Refrigerant filling amount determining means for determining a shortage of the refrigerant filling amount based on the correlation between the compressor outlet pipe temperature at normal time and the refrigerant filling amount calculated by the analyzing means; and And an abnormality display means for displaying a refrigerant shortage abnormality when it is determined that the refrigerant temperature is insufficient. Only for determining a refrigerant shortage, preventing irregular detection of the piping temperature by sudden disturbance, it can prevent erroneous detection of the refrigerant shortage determination.

The invention according to claim 3 is an outlet pipe temperature sensor for detecting the temperature of the outlet pipe of the compressor, an outlet pipe temperature calculating means for quantifying an output signal of the outlet pipe temperature sensor, and an outside air temperature. , An outside air temperature calculating means for quantifying an output signal of the outside air temperature sensor, an indoor temperature sensor for detecting an indoor temperature, and an indoor temperature calculating means for quantifying an output signal of the indoor temperature sensor And, during the cooling operation, a supercooling sensor that detects a degree of pipe subcooling near an inlet of an indoor unit having an indoor heat exchanger,
Supercooling calculating means for converting the output signal of the supercooling sensor into a numerical value, and the indoor unit in a normal state calculated by the analyzing means and the supercooling degree quantified by the supercooling calculating means during a cooling operation. When the refrigerant charging amount determining means determines the shortage of the refrigerant charging amount based on the degree of supercooling of the pipe near the inlet of the pipe and the correlation between the refrigerant charging amounts, and when the refrigerant charging amount determining means determines the shortage of the refrigerant charging amount. Abnormality determining means for determining whether there is an abnormality in the compressor based on the compressor outlet pipe temperature quantified by the outlet pipe temperature calculating means, and the refrigerant charging amount determining means determines whether the refrigerant charging amount is insufficient. After the determination, abnormality display means for displaying a refrigerant shortage abnormality when the first-stage abnormality determination means determines that the compressor is normal, and displays compressor abnormality when the first-time abnormality determination means determines that the compressor is abnormal. By having To determine the presence or absence of abnormality of the compressor when insufficient refrigerant, the worst, the compressor can be prevented accidents caused by fire and other causes.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a flowchart of the air conditioner of the embodiment.

FIG. 3 is a refrigerant quantity characteristic diagram of the air conditioner of the embodiment.

FIG. 4 is a refrigeration cycle diagram of Embodiment 2 of the air-conditioning apparatus according to the present invention.

FIG. 5 is a flowchart of the air conditioner of the embodiment.

FIG. 6 is a refrigeration cycle diagram of Embodiment 3 of the air conditioner according to the present invention.

FIG. 7 is a flowchart of the air conditioner of the embodiment.

FIG. 8 is a refrigerant quantity characteristic diagram of the air-conditioning apparatus of the embodiment.

FIG. 9 is a refrigeration cycle diagram of a conventional air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 3 Outdoor heat exchanger 4 Outdoor blower 7 Indoor heat exchanger 8 Indoor blower A Outdoor unit B Indoor unit Th0 Outlet piping temperature sensor Th1 Outside air temperature sensor Th2 Indoor temperature sensor Th3 Supercooling sensor

Claims (3)

[Claims] An outlet pipe temperature sensor for detecting a temperature of an outlet pipe of the compressor; an outlet pipe temperature calculating means for quantifying an output signal of the outlet pipe temperature sensor; an outside air temperature sensor for detecting an outside air temperature; An outside air temperature calculating means for quantifying an output signal of the outside air temperature sensor; an indoor temperature sensor for detecting an indoor temperature; an indoor temperature calculating means for quantifying an output signal of the indoor temperature sensor; and Analysis means for making a refrigeration cycle characteristic of a normal state of the refrigeration cycle in a cycle simulation between the outside air temperature quantified by the outside air temperature calculation means and the indoor temperature quantified by the indoor temperature calculation means; and The compressor outlet pipe temperature quantified by the outlet pipe temperature calculating means and the normal compressor outlet pipe temperature and refrigerant charging amount calculated by the analyzing means A refrigerant enclosing amount determining means for determining an insufficient refrigerant encapsulating amount based on the relationship, and an abnormality displaying means for displaying a refrigerant insufficiency abnormality when the refrigerant encapsulating amount determining means determines an insufficient refrigerant enclosing amount. Equipped air conditioner. 2. An outlet pipe temperature sensor for detecting a temperature of an outlet pipe of a compressor, an outlet pipe temperature calculating means for quantifying an output signal of the outlet pipe temperature sensor, and calculating the outlet pipe temperature during a predetermined time. While storing each numerical value of the compressor outlet pipe temperature digitized by the means,
A memory means for calculating an average value of each numerical value of the compressor outlet pipe temperature stored during the predetermined time; an outside air temperature sensor for detecting an outside air temperature; and an outside air for quantifying an output signal of the outside air temperature sensor. Temperature calculating means, an indoor temperature sensor for detecting an indoor temperature, an indoor temperature calculating means for quantifying an output signal of the indoor temperature sensor, and an outside air temperature quantified by the outside air temperature calculating means during a cooling operation. Analysis means for performing a cycle simulation of a refrigeration cycle characteristic in a normal state of the refrigeration cycle with respect to the indoor temperature quantified by the indoor temperature calculation means; and the compressor outlet pipe temperature calculated by the memory means during a cooling operation. Refrigerant filling amount that determines the shortage of the refrigerant filling amount based on the average value of the above and the correlation between the compressor outlet pipe temperature at normal times and the refrigerant filling amount calculated by the analysis means. An air conditioner comprising: a determination unit; and an abnormality display unit that displays a refrigerant shortage abnormality when the refrigerant charging amount determination unit determines that the refrigerant charging amount is insufficient. An outlet pipe temperature sensor for detecting a temperature of an outlet pipe of the compressor; an outlet pipe temperature calculating means for quantifying an output signal of the outlet pipe temperature sensor; an outside air temperature sensor for detecting an outside air temperature; Outside air temperature calculating means for quantifying an output signal of the outside air temperature sensor; an indoor temperature sensor for detecting an indoor temperature; an indoor temperature calculating means for quantifying an output signal of the indoor temperature sensor; and A supercooling sensor for detecting a degree of subcooling of a pipe near an inlet of an indoor unit having a heat exchanger; a supercooling operation unit for quantifying an output signal of the supercooling sensor; and a supercooling operation unit during a cooling operation. Determine the shortage of refrigerant charge based on the degree of supercooling quantified in the above and the correlation between the degree of refrigerant supercooling near the inlet of the indoor unit and the amount of refrigerant charge calculated by the analysis means. Refrigerant filling amount determining means, and when the refrigerant filling amount determining means has determined that the refrigerant filling amount is insufficient, the compressor outlet pipe temperature quantified by the outlet pipe temperature calculating means based on the compressor outlet pipe temperature. Abnormality determination means for determining the presence or absence of an abnormality, after the refrigerant charge amount determination means determines the shortage of the refrigerant charge amount, the first abnormality display means displays a refrigerant shortage abnormality when the compressor is determined to be normal, An air conditioner comprising: abnormality display means for displaying compressor abnormality when the abnormality determination means determines that the compressor is abnormal.