JPH1163624A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To estimate a value of one temperature sensor of a compressor from a detected temperature value from the other temperature sensor located at either an inlet or an outlet of the compressor and from pressure values from pressure sensors at the inlet and the outlet of the compressor. SOLUTION: A temperature computing means 41 which computes a signal from a temperature sensor provided in the vicinity of either an inlet or an outlet of a compressor, a pressure computing means 42 which computes signals from pressure sensors provided in the vicinities of the inlet and the outlet of the compressor respectively, a refrigerant circulation amount computing means 43 which computes the amount of circulation of a refrigerant from a pressure value of the pressure computing means and an alternative temperature computing means 46 or 49 which computes the enthalpy of the compressor 1 on the basis of the amount of circulation of the refrigerant computed by the refrigerant circulation amount computing means 43 and computes an outlet temperature when an inlet temperature is known or the inlet temperature when the outlet temperature is known, are provided. Thereby the inlet and outlet temperatures of the compressor are detected by one temperature sensor and reduction of the cost is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an indoor unit and an outdoor unit based on the measured values of a plurality of temperature sensors and pressure sensors. The present invention relates to an air conditioner that keeps operating the device.

[0002]

2. Description of the Related Art Various developments have been made on air conditioners, for example, see Japanese Patent Application Laid-Open No. Hei 9-13801.
The basic technology of the air conditioner as disclosed in Japanese Patent Publication No. 9 is described below.

As shown in FIG. 7, the conventional air conditioner includes one outdoor unit A and two indoor units B1 and B2.

The outdoor unit A comprises a compressor 1, an outdoor heat exchanger 3, an outdoor expansion valve EXP, a compressor inlet temperature sensor Th.
1, a compressor outlet temperature sensor Th2, a compressor inlet pressure sensor p1, and a compressor outlet pressure sensor p2. The indoor unit B1 is composed of an expansion valve EV1 and an indoor heat exchanger 17, and the indoor unit B2 is the same. The expansion valve EV
2. It is composed of an indoor heat exchanger 27.

[0005] The outdoor unit A and the indoor units B1 and B2 are communicated with each other through a refrigerant pipe, and are connected to a compressor 1, an outdoor heat exchanger 3, an outdoor expansion valve EXP, an expansion valve EV1, an indoor heat exchanger 17, and a compressor. The expansion valves EV2 and the indoor heat exchanger 27 are connected in parallel to the expansion valve EV1 and the indoor heat exchanger 17 to form a refrigeration cycle.

The operation of the air conditioner configured as described above will be described. In the case of the heating operation, a heating cycle indicated by a solid line arrow in the drawing is configured, and the indoor heat exchangers 17 and 27 function as a condenser and the outdoor heat exchanger 3 functions as an evaporator.

In the heating cycle, the high-temperature and high-pressure gas refrigerant that has exited the compressor 1 is condensed in the indoor heat exchangers 17 and 27 to become a high-temperature and high-pressure liquid refrigerant, and the indoor unit B1,
B2, and then flows into the outdoor unit A, where the expansion valve E
The cycle in which the refrigerant which has been decompressed and expanded into the two-phase refrigerant by XP evaporates in the outdoor heat exchanger 3 and absorbs heat from the outdoor air (heating operation) is repeated.

The control device CNT determines the temperature of the compressor 1 from the temperature near the outlet of the compressor 1 detected by the compressor outlet temperature sensor Th2 and the pressure near the outlet of the compressor 1 detected by the compressor outlet pressure sensor p2. Is calculated from the temperature near the inlet of the compressor 1 detected by the compressor inlet temperature sensor Th1 and the pressure near the inlet of the compressor 1 detected by the compressor inlet pressure sensor p1. Machine 1
The superheat degree at the inlet of the air conditioner is calculated, and the values of both superheat degrees are selectively used in accordance with the fluctuation of the load.
By opening and closing the opening of the XP, the reliability of the compressor 1 is always ensured, and efficient operation is enabled even when the load changes.

[0009]

However, in the above-described conventional configuration, in order to normally control and operate the air conditioner,
In the compressor 1, it is necessary to attach a temperature sensor for measuring the temperature of the inlet and the outlet and a pressure sensor for measuring the pressure, which has a problem that the cost is increased.

Further, in the above-described conventional configuration, when any one of the temperature sensor and the pressure sensor for measuring the temperature of the inlet and the outlet of the compressor 1 is abnormal,
In order to protect the equipment, all the equipment has to be stopped, and there is a problem that the comfort of the indoor environment is impaired.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides, in a plurality of temperature sensors and a plurality of pressure sensors of a compressor, a temperature value from one of an inlet and outlet of the compressor and a temperature value from one of an inlet and outlet of the compressor. Predict the value of the remaining temperature sensor or pressure sensor from the pressure value from one pressure sensor,
The objective is to reduce costs by reducing the number of installed temperature sensors and pressure sensors.

It is another object of the present invention to provide an air conditioner capable of avoiding the stop of the device when the sensor is abnormal and continuously operating the device without impairing the comfort of the indoor environment.

[0013]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides a compressor temperature sensor installed at one of the vicinity of an inlet or outlet pipe of a compressor; Temperature sensor installation determining means for determining whether the temperature sensor is installed at the inlet or the outlet, temperature calculating means for converting a temperature signal from the compressor temperature sensor into a temperature value, and a compression device installed near the compressor inlet. A compressor inlet pressure sensor, a compressor outlet pressure sensor installed near the compressor outlet, a pressure calculator for converting pressure signals from the compressor inlet pressure sensor and the compressor outlet pressure sensor into a pressure value, and a pressure calculator. Means for calculating the circulation amount of the refrigerant from the pressure value calculated by the means, and, if the temperature near the inlet of the compressor is known, from the pressure value near the inlet of the compressor calculated by the pressure calculating means. Inlet enthalpy calculating means for calculating the inlet enthalpy of the compressor, outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the inlet enthalpy calculated by the inlet enthalpy calculating means, and outlet enthalpy predicted by the outlet enthalpy predicting means An outlet alternative temperature calculating means for back-calculating the compressor outlet temperature from the pressure value near the compressor outlet calculated by the pressure calculating means, and calculating the pressure calculating means when the temperature near the compressor outlet is known. Outlet enthalpy calculating means for calculating the outlet enthalpy of the compressor from the pressure value near the outlet of the compressor, and inlet enthalpy predicting means for predicting the inlet enthalpy of the compressor from the outlet enthalpy calculated by the outlet enthalpy calculating means, The inlet enthalpy predicted by the inlet enthalpy predicting means and the compressor input calculated by the pressure calculating means An inlet alternative temperature calculating means for calculating back the inlet temperature of the compressor from the pressure values in the vicinity,
Calculate the outlet superheat degree from the compressor outlet temperature and outlet pressure, and calculate the inlet superheat degree from the compressor inlet temperature and inlet pressure,
A first control device comprising an actuator driving means for controlling the opening and closing of the outdoor expansion valve so that the obtained outlet superheat degree or inlet superheat degree becomes constant.

Thus, conventionally, an inlet temperature sensor and an outlet temperature sensor were required near the inlet and outlet of the compressor.
If one of the temperature sensors is installed, the other temperature can be predicted and calculated, so that the conventional control can be maintained and the cost can be reduced.

Further, according to the present invention, a compressor pressure sensor installed at one of the inlet and outlet pipes of the compressor and a compressor pressure sensor installed at one of the compressor inlet and outlet are provided. Pressure sensor installation determining means for determining whether a pressure signal from the compressor pressure sensor is converted into a pressure value, a compressor inlet temperature sensor installed near the compressor inlet, and near the compressor outlet A compressor outlet temperature sensor, a temperature calculating means for converting temperature signals from the compressor inlet temperature sensor and the compressor outlet temperature sensor into a temperature value, and circulating the refrigerant from the temperature value calculated by the temperature calculating means. Means for calculating the amount of circulation, and input means for calculating the enthalpy of the inlet of the compressor from the temperature value near the inlet of the compressor calculated by the temperature calculating means when the pressure near the inlet of the compressor is known. And enthalpy calculation means, and the outlet enthalpy predicting means for predicting an exit enthalpy of the compressor from the inlet enthalpy calculated by the inlet enthalpy calculation means,
Outlet enthalpy predicted by the outlet enthalpy predicting means and an outlet alternative pressure calculating means for back-calculating the outlet pressure of the compressor from the temperature value near the outlet of the compressor calculated by the pressure calculating means, and near the outlet of the compressor. When the pressure is known, an outlet enthalpy calculating means for calculating an outlet enthalpy of the compressor from a temperature value near the outlet of the compressor calculated by the temperature calculating means, and a compressor of the compressor based on the outlet enthalpy calculated by the outlet enthalpy calculating means. Inlet enthalpy predicting means for predicting inlet enthalpy, and inlet alternative pressure calculation for calculating the inlet pressure of the compressor back from the inlet enthalpy predicted by the inlet enthalpy predicting means and the temperature value near the inlet of the compressor calculated by the pressure calculating means Means, calculating the outlet superheat degree from the compressor outlet temperature and the outlet pressure, and calculating the inlet superheat degree from the compressor inlet temperature and the inlet pressure, As the value of the outlet superheat degree or inlet superheat that is becomes constant, and constitutes a second control device consisting of an actuator driving means for opening and closing control the degree of opening of the outdoor expansion valve.

Thus, conventionally, an inlet pressure sensor and an outlet pressure sensor were required near the inlet and outlet of the compressor.
If one of the pressure sensors is installed, the other pressure can be predicted and calculated, and the conventional control can be maintained and the cost can be reduced.

Also, the present invention provides a compressor inlet temperature sensor installed near the compressor inlet, a compressor outlet temperature sensor installed near the compressor outlet, a compressor inlet temperature sensor, and a compressor outlet. A temperature calculating means for converting a temperature signal from the temperature sensor into a temperature value, a temperature sensor abnormality determining means for determining an abnormality of the compressor inlet temperature sensor and the compressor outlet temperature sensor, and a temperature value calculated by the temperature calculating means. First circulating amount calculating means for calculating the circulating amount of the refrigerant; a compressor inlet pressure sensor provided near the inlet of the compressor; a compressor outlet pressure sensor provided near the outlet of the compressor; Pressure calculating means for converting pressure signals from the pressure sensor and the compressor outlet pressure sensor into pressure values, pressure sensor malfunction determining means for determining malfunction of the compressor inlet pressure sensor and compressor outlet pressure sensor, The second circulation amount calculation means for calculating the circulation amount of the refrigerant from the pressure value calculated by the calculation means, and the pressure calculation means calculates when the compressor inlet temperature sensor is determined to be abnormal by the temperature sensor abnormality determination means. Outlet enthalpy calculating means for calculating the outlet enthalpy of the compressor from the pressure value near the outlet of the compressor and the temperature value near the outlet of the compressor calculated by the temperature calculating means, and the outlet enthalpy calculated by the outlet enthalpy calculating means. Inlet enthalpy predicting means for predicting the inlet enthalpy of the compressor, and inlet alternative temperature for calculating the inlet temperature of the compressor from the inlet enthalpy predicted by the inlet enthalpy predicting means and the inlet pressure value of the compressor calculated by the pressure calculating means Calculating means for determining, when the temperature sensor abnormality determining means determines that the compressor outlet temperature sensor is abnormal, the pressure calculated by the pressure calculating means. Inlet enthalpy calculating means for calculating the compressor enthalpy from the pressure value near the compressor inlet and the temperature value near the compressor inlet calculated by the temperature calculating means, and compression from the inlet enthalpy calculated by the inlet enthalpy calculating means Outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor, and outlet alternative temperature calculation for calculating the outlet temperature of the compressor from the outlet enthalpy predicted by the outlet enthalpy predicting means and the compressor outlet pressure value calculated by the pressure calculating means. When the compressor inlet pressure sensor is determined to be abnormal by the pressure sensor abnormality determination means,
Outlet enthalpy calculating means for calculating the outlet enthalpy of the compressor from the temperature value near the compressor outlet calculated by the temperature calculating means and the pressure value near the compressor outlet calculated by the pressure calculating means, and outlet enthalpy calculating means Inlet enthalpy predicting means for predicting the inlet enthalpy of the compressor from the outlet enthalpy calculated in the above, and the inlet of the compressor from the inlet enthalpy predicted by the inlet enthalpy predicting means and the inlet temperature value of the compressor calculated by the temperature calculating means An inlet alternative pressure calculating means for back-calculating the pressure, wherein when the pressure sensor abnormality determining means determines that the compressor outlet pressure sensor is abnormal, the temperature value near the inlet of the compressor calculated by the temperature calculating means and the pressure calculation. Means for calculating the inlet enthalpy of the compressor from the pressure value near the inlet of the compressor calculated by the means; Outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the inlet enthalpy calculated by the calculating means; and the compressor based on the outlet enthalpy predicted by the outlet enthalpy predicting means and the outlet temperature value of the compressor calculated by the temperature calculating means. An outlet alternative pressure calculating means for calculating the outlet pressure of the compressor, calculating the outlet superheat degree from the compressor outlet temperature and the outlet pressure, and calculating the inlet superheat degree from the compressor inlet temperature and the inlet pressure. A third control device comprising actuator driving means for controlling the opening and closing of the outdoor expansion valve so that the value of the degree of superheat or the degree of superheat at the inlet becomes constant.

[0018] Thus, even if any one of the inlet temperature sensor, the inlet pressure sensor, the outlet temperature sensor, and the outlet pressure sensor installed near the inlet and outlet of the compressor becomes abnormal, the normal state is maintained. The temperature or pressure on the abnormal side can be predicted and calculated from the values of the appropriate temperature sensor or pressure sensor, and the equipment can be continuously operated without impairing the comfort of the indoor environment.

[0019]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 is an outdoor unit comprising a compressor, an outdoor heat exchanger, an outdoor expansion valve, and an outdoor blower, an expansion valve, a refrigerant distributor, an indoor heat exchanger, and an indoor unit. And an indoor unit including a blower, wherein the compressor, the indoor heat exchanger, the refrigerant flow divider, the expansion valve, the outdoor heat exchanger, and the compressor are sequentially connected in a ring through a refrigerant pipe. Circulating the refrigerant to form a heating cycle,
A compressor temperature sensor installed near one of the inlet or outlet pipes of the compressor, and a temperature sensor for determining whether the compressor temperature sensor is installed at either the inlet or the outlet of the compressor. An installation determining unit, a temperature calculating unit that converts a temperature signal from the compressor temperature sensor into a temperature value, a compressor inlet pressure sensor installed near the compressor inlet, and a compressor inlet pressure sensor installed near the compressor outlet. A compressor outlet pressure sensor, a pressure calculating means for converting a pressure signal from the compressor inlet pressure sensor and the compressor outlet pressure sensor into a pressure value, and a pressure of the refrigerant from the pressure value calculated by the pressure calculating means. Circulating amount calculating means for calculating the circulating amount, and when the temperature near the inlet of the compressor is known, the compressor is calculated from a pressure value near the inlet of the compressor calculated by the pressure calculating means. Inlet enthalpy calculating means for calculating inlet enthalpy, outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the inlet enthalpy calculated by the inlet enthalpy calculating means, and outlet enthalpy predicted by the outlet enthalpy predicting means. An outlet alternative temperature calculating means for back-calculating the outlet temperature of the compressor from the pressure value near the outlet of the compressor calculated by the pressure calculating means, wherein the temperature near the outlet of the compressor is known.
An outlet enthalpy calculating means for calculating an outlet enthalpy of the compressor from a pressure value near the outlet of the compressor calculated by the pressure calculating means; and an inlet of the compressor based on the outlet enthalpy calculated by the outlet enthalpy calculating means. An inlet enthalpy predicting means for predicting enthalpy, and an inlet for reversely calculating the inlet temperature of the compressor from the inlet enthalpy predicted by the inlet enthalpy predicting means and the pressure value near the inlet of the compressor calculated by the pressure calculating means. Alternative temperature calculating means, and actuator driving means for determining and controlling the on / off operation of the compressor from the inlet or outlet temperature value of the compressor obtained by the inlet alternative temperature calculating means or the outlet alternative temperature calculating means. An inlet temperature sensor is installed near the inlet of the compressor. In this case, the temperature value near the outlet of the compressor is predicted from the temperature near the inlet of the compressor and the pressure values from the inlet pressure sensor installed near the inlet of the compressor and the outlet pressure sensor installed near the outlet of the compressor. If an outlet temperature sensor is installed near the outlet of the compressor, the temperature near the outlet of the compressor and the inlet pressure sensor installed near the inlet of the compressor and the outlet pressure sensor installed near the outlet Has the function of predicting the temperature value near the inlet of the compressor from the pressure value of the compressor.

According to a second aspect of the present invention, there is provided an outdoor unit including a compressor, an outdoor heat exchanger, an outdoor expansion valve, and an outdoor blower, and an indoor unit including an expansion valve, a refrigerant distributor, an indoor heat exchanger, and an indoor blower. The compressor, the indoor heat exchanger, the refrigerant flow divider, the expansion valve, the outdoor heat exchanger, and the compressor are sequentially connected in an annular manner by a refrigerant pipe to circulate the refrigerant and heat. Forming a cycle, a compressor pressure sensor installed either near the inlet or outlet piping of the compressor, and whether the compressor pressure sensor is installed at either the inlet or the outlet of the compressor Pressure sensor installation determining means, a pressure calculating means for converting a pressure signal from the compressor pressure sensor into a pressure value, a compressor inlet temperature sensor installed near the compressor inlet, A compressor outlet temperature sensor installed near the outlet of the compressor, temperature calculating means for converting temperature signals from the compressor inlet temperature sensor and the compressor outlet temperature sensor into a temperature value, and a temperature calculating means. Circulating amount calculating means for calculating the circulating amount of the refrigerant from the temperature value obtained, and, if the pressure near the inlet of the compressor is known, the temperature is calculated from the temperature value near the inlet of the compressor calculated by the temperature calculating means. Inlet enthalpy calculating means for calculating the inlet enthalpy of the compressor, outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the inlet enthalpy calculated by the inlet enthalpy calculating means, and predicted by the outlet enthalpy predicting means An outlet alternative pressure for back-calculating the compressor outlet pressure from the outlet enthalpy and the temperature value near the outlet of the compressor calculated by the pressure calculating means. And a calculation means,
An outlet enthalpy calculating means for calculating an outlet enthalpy of the compressor from a temperature value near the outlet of the compressor calculated by the temperature calculating means when a pressure near the outlet of the compressor is known; Means for predicting the inlet enthalpy of the compressor from the outlet enthalpy calculated by the means, and the vicinity of the inlet of the compressor calculated by the inlet enthalpy predicted by the inlet enthalpy predicting means and the pressure calculating means. An inlet alternative pressure calculating means for back-calculating the inlet pressure of the compressor from a temperature value, and the compressor based on a pressure value at the inlet or outlet of the compressor obtained by the inlet alternative pressure calculating means or the outlet alternative pressure calculating means. A second control device comprising an actuator driving means for determining and controlling the on / off operation of the compressor. When an inlet pressure sensor is installed near the inlet, the pressure value near the inlet of the compressor and the temperature value from the inlet temperature sensor installed near the inlet of the compressor and the temperature value from the outlet temperature sensor installed near the outlet are Predict the pressure value near the outlet of the compressor, if an outlet pressure sensor is installed near the outlet of the compressor, and the pressure near the outlet of the compressor and the inlet temperature sensor installed near the inlet of the compressor It has the function of predicting the pressure value near the inlet of the compressor from the temperature value from the outlet temperature sensor installed near the outlet.

According to a third aspect of the present invention, there is provided an outdoor unit including a compressor, an outdoor heat exchanger, an outdoor expansion valve, and an outdoor blower, and an indoor unit including an expansion valve, a refrigerant distributor, an indoor heat exchanger, and an indoor blower. The compressor, the indoor heat exchanger, the refrigerant flow divider, the expansion valve, the outdoor heat exchanger, and the compressor are sequentially connected in an annular manner by a refrigerant pipe to circulate the refrigerant and heat. Forming a cycle, a compressor inlet temperature sensor installed near the compressor inlet, a compressor outlet temperature sensor installed near the compressor outlet, the compressor inlet temperature sensor, and the compressor outlet Temperature calculating means for converting a temperature signal from the temperature sensor into a temperature value, temperature sensor abnormality determining means for determining an abnormality of the compressor inlet temperature sensor and the compressor outlet temperature sensor, and calculating by the temperature calculating means. First circulating amount calculating means for calculating the circulating amount of the refrigerant from the temperature value obtained, a compressor inlet pressure sensor installed near an inlet of the compressor, and a compressor outlet installed near an outlet of the compressor. A pressure sensor; a pressure calculating means for converting pressure signals from the compressor inlet pressure sensor and the compressor outlet pressure sensor into pressure values; and determining an abnormality of the compressor inlet pressure sensor and the compressor outlet pressure sensor. Pressure sensor abnormality determination means, second circulation amount calculation means for calculating the circulation amount of the refrigerant from the pressure value calculated by the pressure calculation means, and the compressor inlet temperature sensor is determined to be abnormal by the temperature sensor abnormality determination means. If determined,
Outlet enthalpy calculating means for calculating the outlet enthalpy of the compressor from the pressure value near the outlet of the compressor calculated by the pressure calculating means and the temperature value near the outlet of the compressor calculated by the temperature calculating means; An inlet enthalpy predictor for predicting an inlet enthalpy of the compressor from an outlet enthalpy calculated by the outlet enthalpy calculator; an inlet enthalpy predicted by the inlet enthalpy predictor; and the compression calculated by the pressure calculator. An inlet alternative temperature calculating means for calculating the inlet temperature of the compressor from the inlet pressure value of the compressor, and when the compressor outlet temperature sensor is determined to be abnormal by the temperature sensor abnormality determining means, the pressure calculating means From the calculated pressure value near the inlet of the compressor and the temperature value calculated by the temperature calculating means near the inlet of the compressor, Inlet enthalpy calculating means for calculating the inlet enthalpy of the compressor, outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the inlet enthalpy calculated by the inlet enthalpy calculating means, and predicted by the outlet enthalpy predicting means An outlet alternative temperature calculating means for back-calculating an outlet temperature of the compressor from an outlet enthalpy and an outlet pressure value of the compressor calculated by the pressure calculating means, wherein the compressor inlet pressure sensor is provided by the pressure sensor abnormality determining means. Is determined to be abnormal, the outlet enthalpy of the compressor is obtained from the temperature value near the outlet of the compressor calculated by the temperature calculating means and the pressure value near the outlet of the compressor calculated by the pressure calculating means. Exit enthalpy calculating means for calculating the enthalpy calculated from the exit enthalpy calculated by the exit enthalpy calculating means. Inlet enthalpy predicting means for predicting the inlet enthalpy of the compressor; and calculating the inlet pressure of the compressor from the inlet enthalpy predicted by the inlet enthalpy predicting means and the inlet temperature value of the compressor calculated by the temperature calculating means. A pressure value near the inlet of the compressor calculated by the temperature calculating means, and a pressure value when the compressor outlet pressure sensor is determined to be abnormal by the pressure sensor abnormality determining means. Inlet enthalpy calculating means for calculating the inlet enthalpy of the compressor from the pressure value near the inlet of the compressor calculated by the pressure calculating means; and outlet enthalpy of the compressor from the inlet enthalpy calculated by the inlet enthalpy calculating means. Enthalpy estimating means for estimating the temperature, the exit enthalpy predicted by the exit enthalpy estimating means, and the temperature And a substitute outlet pressure calculating means for calculating the outlet pressure of the compressor from the outlet temperature value of the compressor calculated by the calculating means, wherein the substitute inlet temperature calculating means obtained by the inlet substitute temperature calculating means or the substitute outlet temperature calculating means. A third control device comprising an actuator driving means for determining and controlling the on / off operation of the compressor from the temperature value at the inlet or the outlet of the compressor, wherein the third control device comprises an inlet temperature installed near the inlet of the compressor. If either the sensor or the outlet temperature sensor installed near the outlet becomes abnormal, the abnormal side temperature value and the pressure value from the pressure sensor Has the effect of predicting temperature values,
If one of the inlet pressure sensor installed near the inlet of the compressor and the outlet pressure sensor installed near the outlet becomes abnormal, it is installed near the normal side pressure value and the inlet and outlet of the compressor. It has the function of predicting the abnormal side pressure value from the temperature value from the temperature sensor.

[0022]

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, black arrows indicate the flow direction of the refrigerant during a normal heating operation.
FIG. 2 is a flowchart of 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, which comprises a compressor 1, an outdoor blower 4, an outdoor expansion valve EXP, and an outdoor heat exchanger 3. B is an indoor unit, and an expansion valve EV and a refrigerant. It is composed of a flow divider 5, an indoor heat exchanger 7, and an indoor blower 8, and includes a compressor 1, an indoor heat exchanger 7, a refrigerant flow divider 5, an expansion valve EV, an outdoor expansion valve EXP, and an outdoor heat exchanger. 3. A heating cycle is formed in which the compressors 1 are sequentially connected in a ring by a refrigerant pipe to circulate the refrigerant.

Reference numeral 40 denotes a temperature sensor installation judging means.
Based on the signal output from the compressor temperature sensor Th0 installed in the pipe near the inlet or outlet of the compressor 1, it is determined which of the inlet and outlet is installed.

Reference numeral 41 denotes a temperature calculating means. When the compressor temperature sensor Th0 is installed in a pipe near the inlet of the compressor 1, a pipe temperature signal near the inlet is taken in and converted into a temperature value. When installed in a pipe near the outlet of the machine 1, the pipe temperature signal near the outlet is converted into a temperature value.

Reference numeral 42 denotes a pressure calculating means which converts a pressure signal from a compressor inlet pressure sensor p1 installed in the pipe near the inlet of the compressor 1 and a compressor outlet pressure sensor p2 installed in the pipe near the outlet into a pressure value. Convert.

Numeral 43 denotes a circulation amount calculating means, which circulates the refrigerant based on an empirical formula having a function of a ratio of a pipe pressure value near the inlet and a pipe pressure value near the outlet of the compressor 1 converted by the pressure calculating means 42. Calculate the quantity.

Reference numeral 44 denotes entrance enthalpy calculation means,
From an empirical formula having a function of the pipe temperature near the inlet of the compressor 1 converted by the temperature calculating means 41 and the pipe pressure value near the inlet of the compressor 1 calculated by the pressure calculating means 42 as a function, the vicinity of the inlet of the compressor 1 is calculated. Calculate the pipe enthalpy.

Numeral 45 denotes exit enthalpy prediction means,
The enthalpy of the piping near the outlet of the compressor 1 is predicted from an empirical formula having the inlet enthalpy calculated by the inlet enthalpy calculating means 44 as a function.

Reference numeral 46 denotes an outlet alternative temperature calculating means, which is based on an empirical formula having the outlet pressure of the compressor 1 calculated by the pressure calculating means 42 and the outlet enthalpy predicted by the outlet enthalpy predicting means 45 as functions. Back calculation of piping temperature near outlet.

Reference numeral 47 denotes an exit enthalpy calculation means.
From an empirical formula having a function of the pipe temperature near the outlet of the compressor 1 converted by the temperature calculating means 41 and the pipe pressure value near the outlet of the compressor 1 calculated by the pressure calculating means 42 as a function, Calculate the pipe enthalpy.

48 is an entrance enthalpy predicting means,
The enthalpy of the pipe near the inlet of the compressor 1 is predicted from an empirical formula having the outlet enthalpy calculated by the outlet enthalpy calculating means 47 as a function.

Reference numeral 49 denotes an inlet alternative temperature calculating means, which is based on an empirical formula having a function of the inlet pressure calculated by the pressure calculating means 42 and the inlet enthalpy predicted by the inlet enthalpy predicting means 48 as a function. Calculate the pipe temperature back.

Numeral 50 denotes actuator driving means.
The outlet superheat degree is calculated from the outlet temperature and the outlet pressure of the compressor 1, and the inlet superheat degree is calculated from the compressor inlet temperature and the inlet pressure, so that the obtained outlet superheat degree or inlet superheat degree becomes constant. Then, the outdoor expansion valve EXP is opened and closed. These are configured in the first control device Cont1.

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

In FIG. 2, in STEP 1, during the heating operation, the temperature sensor installation determining means 40 determines whether the inlet of the compressor 1 is based on a signal output from a compressor temperature sensor Th 0 installed in a pipe near the inlet or outlet of the compressor 1. Determine which of the exits is installed.

In STEP 2, when the compressor temperature sensor Th0 is installed in the pipe near the inlet of the compressor 1 by the temperature calculating means 41, a pipe temperature signal near the inlet is taken in and a temperature value (for example, tin = -3 ° C.). ), While
When installed in a pipe near the outlet of the compressor 1, a pipe temperature signal near the outlet is converted to a temperature value (for example, Tout = 100).
° C).

In STEP 3, the pressure signal from the compressor inlet pressure sensor p1 installed in the pipe near the inlet of the compressor 1 and the compressor outlet pressure sensor p2 installed in the pipe near the outlet is calculated by the pressure calculating means 42 as a pressure value ( For example, pin = 0.
45 MPa, pout = 2.3 MPa).

In STEP 4, the circulation amount calculating means 43 converts the pressure calculated by the pressure calculating means 42 into a pipe pressure value near the inlet of the compressor 1 (for example, pin = 0.45 MPa) and a pipe pressure value near the outlet (for example, pout = 2.3MPa) from the empirical formula (Equation 1) as a function of the ratio (for example, PCOMP = 5.1) as a function of the refrigerant circulation amount (for example, Gr = 170 kg /
h) is calculated.

[0042]

(Equation 1)

In STEP 5, the compressor temperature sensor Th0
Is branched in the following control method when is installed in the pipe near the inlet of the compressor 1 and when it is installed in the pipe near the outlet.

In STEP 6, the inlet enthalpy calculating means 44 calculates the pipe temperature (for example, tin = -3 ° C.) near the inlet of the compressor 1 converted by the temperature calculating means 41 and the compressor 1 calculated by the pressure calculating means 42. Enthalpy (for example, h1 = 150 kcal / kg) near the inlet of the compressor 1 is calculated from an empirical formula (Equation 2) having a function of a pipe pressure value (for example, pin = 0.45 Mpa) near the inlet of the compressor.

[0045]

(Equation 2)

In STEP 7, the entrance enthalpy prediction means 45 calculates the entrance enthalpy calculated by the entrance enthalpy calculation means 44 (for example, h1 = 150 kcal / kg).
From the empirical formula (Equation 3) having the following equation, the enthalpy of the pipe near the outlet of the compressor 1 (for example, h2 ′ = 160 kcal / k)
g).

[0047]

(Equation 3)

In STEP 8, the outlet alternative temperature calculating means 4
6, the outlet pressure (for example, pout = 2.3 MPa) calculated by the pressure calculating means 42 and the outlet enthalpy (for example, h2 '=) predicted at 45 by the outlet enthalpy predicting means.
From the empirical formula (Equation 4) having a function of 160 kcal / kg), the pipe temperature near the outlet of the compressor 1 (for example, tout ′ =
100 ° C.).

[0049]

(Equation 4)

In STEP 9, the outlet enthalpy calculating means 47 calculates the pipe temperature (for example, tout = 100 ° C.) near the outlet of the compressor 1 converted by the temperature calculating means 41 and calculates the compressor 1 calculated by the pressure calculating means 42. A pipe enthalpy (for example, h2 = 160 kcal / kg) near the outlet of the compressor 1 is calculated from an empirical formula (Equation 5) having a function of a pipe pressure value (for example, pout = 2.3 MPa) near the outlet.

[0051]

(Equation 5)

In STEP 10, the entrance enthalpy estimating means 48 calculates the exit enthalpy calculated by the exit enthalpy calculating means 47 (for example, h2 = 160 kcal / k).
g) as a function, the enthalpy of the pipe near the inlet of the compressor 1 (for example, h1 ′ = 150 kcal /
kg).

[0053]

(Equation 6)

In STEP 11, the inlet pressure (for example, pin = 0.45 MPa) calculated by the pressure calculating means 42 and the inlet enthalpy (for example, h1 ') predicted by the inlet enthalpy predicting means 48 are calculated by the inlet alternative temperature calculating means 49.
= 150 kcal / kg) as a function (Equation 7)
From the pipe temperature near the inlet of the compressor 1 (for example, tin '=
-3 ° C).

[0055]

(Equation 7)

In STEP 12, the actuator drive means 50 calculates the outlet superheat degree from the compressor outlet temperature and the outlet pressure, and calculates the inlet superheat degree from the compressor inlet temperature and the inlet pressure. The opening degree of the outdoor expansion valve is controlled to open and close (for example, opening and closing operations are performed so that the inlet superheat degree of the compressor 1 becomes the target superheat degree K = 3K) so that the value of the inlet superheat degree becomes constant, and the process returns to STEP1.

Thus, conventionally, at least two or more compressor temperature sensors Th0 are required near the inlet / outlet of the compressor 1, but either one of the compressor temperature sensors Th0 is required.
Is installed, the other temperature can be predicted and calculated, and the conventional control can be maintained and the cost can be reduced.

In the present embodiment, the compressor temperature sensor th0 is installed near the inlet pipe of the compressor 1, but the compressor temperature sensor th0 is connected to the outdoor heat exchanger 3.
The same effect can be obtained even if it is installed in the pipe near the outlet.

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

FIG. 3 is a refrigeration cycle diagram of an air conditioner according to Embodiment 2 of the present invention. In FIG. 3, black arrows indicate the flow direction of the refrigerant during a normal heating operation.

FIG. 4 is a flowchart of the embodiment. In FIG. 3, reference numeral 51 denotes a pressure sensor installation judging means, which is installed at either the inlet or the outlet based on a signal output from a compressor pressure sensor p0 installed in a pipe near the inlet or the outlet of the compressor 1. Is determined.

Reference numeral 52 denotes a pressure calculating means. When the compressor pressure sensor p0 is installed in a pipe near the inlet of the compressor 1, a pipe pressure signal near the inlet is taken in and converted into a pressure value. When installed in a pipe near the outlet of the machine 1, the pipe pressure signal near the outlet is converted into a pressure value.

Reference numeral 53 denotes a temperature calculating means, which is a compressor inlet temperature sensor Th1 installed in the pipe near the inlet of the compressor 1 and a compressor outlet temperature sensor Th2 installed in the pipe near the outlet.
Is converted into a temperature value.

Numeral 54 denotes a circulation amount calculating means, which circulates the refrigerant based on an empirical formula having a function of the ratio of the pipe pressure value near the inlet and the pipe temperature value near the outlet of the compressor 1 converted by the temperature calculating means 53. Calculate the quantity.

Reference numeral 44 denotes an entrance enthalpy calculating means.
From an empirical formula having a function of the pipe pressure near the inlet of the compressor 1 converted by the pressure calculating means 52 and the pipe temperature near the inlet of the compressor 1 calculated by the temperature calculating means 53 as a function, the vicinity of the inlet of the compressor 1 is calculated. Calculate the pipe enthalpy.

Reference numeral 45 denotes exit enthalpy prediction means.
The enthalpy of the piping near the outlet of the compressor 1 is predicted from an empirical formula having the inlet enthalpy calculated by the inlet enthalpy calculating means 44 as a function.

Reference numeral 55 denotes an outlet alternative temperature calculating means, which is based on an empirical formula having the outlet temperature of the compressor 1 calculated by the temperature calculating means 53 and the outlet enthalpy predicted by the outlet enthalpy predicting means 45 as functions. Back calculation of the piping pressure near the outlet.

Reference numeral 47 denotes an exit enthalpy calculation means.
From an empirical formula having a function of the pipe pressure near the outlet of the compressor 1 converted by the pressure calculating means 52 and the pipe temperature near the outlet of the compressor 1 calculated by the temperature calculating means 53 as functions, Calculate the pipe enthalpy.

Numeral 48 denotes entrance enthalpy prediction means,
The enthalpy of the pipe near the inlet of the compressor 1 is predicted from an empirical formula having the outlet enthalpy calculated by the outlet enthalpy calculating means 47 as a function.

Reference numeral 56 denotes an inlet alternative temperature calculating means, which is based on an empirical formula having a function of the inlet temperature calculated by the temperature calculating means 53 and the inlet enthalpy predicted by the inlet enthalpy predicting means 48 as a function. Calculate the pipe pressure back.

These are configured in the second control device Cont2. The operation of the air conditioner configured as described above will be described below with reference to the flowchart of FIG.

In FIG. 4, in STEP 13, during the heating operation, the pressure sensor installation judging means 51 uses the pressure output from the compressor pressure sensor p 0 installed in the pipe near the inlet or outlet of the compressor 1 based on the signal output from the compressor pressure sensor p 0. Determine which of the exits is installed.

In STEP 14, when the compressor pressure sensor p0 is installed in the pipe near the inlet of the compressor 1 by the pressure calculating means 52, a pipe pressure signal near the inlet is taken in and the pressure value (for example, pin = 0.45 MPa) ),
On the other hand, when installed in the pipe near the outlet of the compressor 1,
A pipe pressure signal near the outlet is converted to a pressure value (for example, pout =
2.3 MPa).

In STEP 15, the temperature signals from the compressor inlet temperature sensor Th1 installed in the pipe near the inlet of the compressor 1 and the compressor outlet temperature sensor Th2 installed in the pipe near the outlet are output by the temperature calculating means 53 to the temperature value ( For example, thi
n = -3 ° C., thout = 100 ° C.).

In STEP 16, the ratio (for example, T = T °) between the pipe temperature near the inlet of the compressor 1 (for example, thin = −3 ° C.) and the pipe temperature near the outlet (for example, pout = 100 ° C.)
The refrigerant circulation amount (for example, Gr = 170 kg / h) is calculated from the empirical formula (Equation 8) using COMP = 33 as a function.

[0076]

(Equation 8)

In STEP 17, the compressor pressure sensor p0
Is branched in the following control method when is installed in the pipe near the inlet of the compressor 1 and when it is installed in the pipe near the outlet.

In STEP 18, the outlet alternative pressure calculating means 55 calculates the outlet temperature (for example, thout = 100 ° C.) calculated by the temperature calculating means 53 and the outlet enthalpy (for example, h2 ′) predicted at 45 by the outlet enthalpy predicting means.
= 160 kcal / kg) as a function (Equation 9)
From the piping pressure near the outlet of the compressor 1 (for example, pout '
= 2.3 MPa).

[0079]

(Equation 9)

In STEP 19, the inlet alternative pressure calculating means 56 calculates the inlet temperature (for example, thin = -3 ° C.) calculated by the temperature calculating means 53 and the inlet enthalpy (for example, h1 '= 15) predicted by the inlet enthalpy predicting means 48.
0 kcal / kg) as a function from the empirical formula (Equation 10), the piping pressure near the inlet of the compressor 1 (for example, pin '= 2.
3 MPa).

[0081]

(Equation 10)

As described above, conventionally, at least two or more compressor pressure sensors p0 are required near the inlet and outlet of the compressor 1, but if one of the compressor pressure sensors p0 is installed, the other is used. The temperature can be estimated and calculated, so that the conventional control can be maintained and the cost can be further reduced.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to the drawings.

FIG. 5 is a refrigeration cycle diagram of an air conditioner according to Embodiment 3 of the present invention. In FIG. 5, black arrows indicate the flow direction of the refrigerant during a normal heating operation.

FIG. 6 is a flowchart of the embodiment. In FIG. 5, Th1 is a compressor inlet temperature sensor installed in a pipe near the inlet of the compressor 1. Th2 is a compressor outlet temperature sensor installed in a pipe near the outlet of the compressor 1.

Reference numeral 57 denotes a temperature sensor abnormality determining means.
If an abnormal signal is detected in the signal output from the compressor inlet temperature sensor Th1 installed near the inlet of the compressor 1 and the compressor outlet temperature sensor Th2 installed in the pipe near the outlet, the sensor is determined to be abnormal. .

Reference numeral 58 denotes a temperature calculating means which takes in a pipe temperature signal near the inlet only when the compressor inlet temperature sensor Th1 is normal and converts it into a temperature value, and outputs a temperature near the outlet only when the compressor outlet temperature sensor Th2 is normal. Is converted into a temperature value.

Reference numeral 59 denotes a first circulation amount calculating means which circulates the refrigerant based on an empirical formula obtained by converting the ratio of the pipe temperature near the inlet to the pipe near the outlet converted by the temperature calculating means 58 as a function. Calculate the quantity.

Reference numeral 60 denotes pressure sensor abnormality determination means.
When an abnormal signal is detected in the signal output from the compressor inlet pressure sensor p1 installed near the inlet of the compressor 1 and the compressor outlet pressure sensor p2 installed in the pipe near the outlet, the sensor is determined to be abnormal. .

Reference numeral 61 denotes a pressure calculating means which takes in a pipe pressure signal near the inlet only when the compressor inlet pressure sensor p1 is normal and converts it into a pressure value.
Only when 2 is normal, the pipe pressure signal near the outlet is converted to a pressure value.

Reference numeral 62 denotes a second circulation amount calculating means, which circulates the refrigerant based on an empirical formula obtained by converting the ratio between the pipe pressure value near the inlet of the compressor 1 and the pipe pressure value near the outlet converted by the pressure calculating means 61 as a function. Calculate the quantity.

These are configured in the third control device Cont3. The operation of the air conditioner configured as described above will be described below with reference to the flowchart of FIG.

In FIG. 6, in STEP 20, the temperature sensor abnormality judging means 57 outputs a signal from the compressor inlet temperature sensor Th 1 installed near the inlet of the compressor 1 and the compressor outlet temperature sensor Th 2 installed near the outlet of the compressor. If an abnormal signal is detected in the signal output, the corresponding sensor is determined to be abnormal.

In STEP 21, the temperature calculating means 58 takes in a pipe temperature signal near the inlet only when the compressor inlet temperature sensor Th1 is normal, and obtains a temperature value (for example, tin =
-3 ° C.), and only when the compressor outlet temperature sensor Th2 is normal, the pipe temperature signal near the outlet is converted to a temperature value (for example, t
out = 100 ° C.).

At STEP 22, the pressure sensor abnormality judging means 60 detects the signal output from the compressor inlet pressure sensor p1 installed near the inlet of the compressor 1 and the compressor output pressure sensor p2 installed at the pipe near the outlet. If an abnormal signal is detected, the corresponding sensor is determined to be abnormal.

In STEP 23, only when the compressor inlet pressure sensor p1 is normal, the pipe pressure signal near the inlet is taken in by the pressure calculating means 61, and the pressure value (for example, pin =
0.45 MPa), and the pressure at the compressor outlet pressure sensor p2
Is normal, the pipe pressure signal near the outlet is converted to a pressure value (for example, pout = 2.3 MPa).

At STEP 24, the compressor inlet temperature sensor Th1 is normal and the compressor outlet temperature sensor Th2 is abnormal, and the compressor inlet pressure sensor p1 is normal and the compressor outlet pressure sensor p2 is abnormal. Branch to STEP6 only if
When h2 is normal and the compressor inlet temperature sensor Th1 is abnormal, the process branches to STEP9 only when the compressor outlet pressure sensor p2 is normal and the compressor inlet pressure sensor p1 is abnormal, and both are performed. ST if normal
The control method branches to EP12.

Thus, any one of the compressor inlet temperature sensor Th1, the compressor inlet pressure sensor p1, the compressor outlet temperature sensor Th2, and the compressor outlet pressure sensor p2 installed near the inlet and outlet of the compressor 1 can be used. Even when the sensor or the pressure sensor becomes abnormal, the temperature or pressure on the abnormal side can be predicted and calculated from the values of the normal temperature sensor or pressure sensor, and the device can be continuously operated without impairing the indoor environment comfort.

[0099]

As described above, the first aspect of the present invention provides an outdoor unit including a compressor, an outdoor heat exchanger, an outdoor expansion valve, and an outdoor blower, an expansion valve, a refrigerant flow divider, and an indoor heat exchanger. And an indoor unit comprising an indoor blower, and the compressor, the indoor heat exchanger, the refrigerant flow divider, the expansion valve, the outdoor heat exchanger, and the compressor are sequentially connected in a ring by refrigerant piping. Circulating a refrigerant to form a heating cycle, and a compressor temperature sensor installed near either the inlet or outlet piping of the compressor, and wherein the compressor temperature sensor is either the inlet or the outlet of the compressor. Temperature sensor installation determining means for determining whether or not the compressor is installed on one side, temperature calculating means for converting a temperature signal from the compressor temperature sensor into a temperature value, and a compressor inlet provided near the compressor inlet. A force sensor, a compressor outlet pressure sensor installed near an outlet of the compressor, a pressure calculating means for converting a pressure signal from the compressor inlet pressure sensor and the compressor outlet pressure sensor into a pressure value, Circulating amount calculating means for calculating the circulating amount of the refrigerant from the pressure value calculated by the pressure calculating means, and an inlet of the compressor calculated by the pressure calculating means when the temperature near the inlet of the compressor is known. Inlet enthalpy calculating means for calculating the inlet enthalpy of the compressor from a nearby pressure value; outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the inlet enthalpy calculated by the inlet enthalpy calculating means; The outlet temperature of the compressor is calculated from the outlet enthalpy predicted by the predicting unit and the pressure value near the outlet of the compressor calculated by the pressure calculating unit. An outlet alternative temperature calculating means for calculating the outlet enthalpy of the compressor from the pressure value near the outlet of the compressor calculated by the pressure calculating means when the temperature near the outlet of the compressor is known. Outlet enthalpy calculating means, inlet enthalpy predicting means for predicting the inlet enthalpy of the compressor from the outlet enthalpy calculated by the outlet enthalpy calculating means, inlet enthalpy predicted by the inlet enthalpy predicting means and the pressure calculating means An inlet alternative temperature calculating means for back-calculating the inlet temperature of the compressor from the pressure value near the inlet of the compressor calculated in the above, an outlet superheat degree is calculated from the compressor outlet temperature and the outlet pressure, and the compressor The inlet superheat degree is calculated from the inlet temperature and the inlet pressure, and the outdoor expansion valve is opened so that the obtained outlet superheat degree or inlet superheat degree becomes constant. Conventionally, at least two or more temperature sensors are required near the inlet and outlet of the compressor by providing the first control device including the actuator driving means for controlling the opening and closing of the temperature. If so,
The other temperature can be predicted and calculated, so that the conventional control can be maintained and the cost can be reduced.

The invention according to claim 2 comprises an outdoor unit including a compressor, an outdoor heat exchanger, an outdoor expansion valve, and an outdoor blower, an expansion valve, a refrigerant flow divider, an indoor heat exchanger, and an indoor blower. The indoor unit, the compressor, the indoor heat exchanger, the refrigerant flow divider, the expansion valve,
The outdoor heat exchanger and the compressor are sequentially connected in an annular manner with a refrigerant pipe to circulate the refrigerant to form a heating cycle, and a compressor pressure installed at one of the inlet and outlet pipes of the compressor. A sensor, a pressure sensor installation determining means for determining whether the compressor pressure sensor is installed at either the inlet or the outlet of the compressor, and converting a pressure signal from the compressor pressure sensor into a pressure value. Pressure calculating means, a compressor inlet temperature sensor installed near the compressor inlet, a compressor outlet temperature sensor installed near the compressor outlet, the compressor inlet temperature sensor and the compressor outlet temperature Temperature calculating means for converting a temperature signal from a sensor into a temperature value; circulating amount calculating means for calculating a circulating amount of the refrigerant from the temperature value calculated by the temperature calculating means; When the pressure in the vicinity is known, it is calculated by the inlet enthalpy calculating means for calculating the inlet enthalpy of the compressor from the temperature value near the inlet of the compressor calculated by the temperature calculating means, and calculated by the inlet enthalpy calculating means. Outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the inlet enthalpy, and the compression based on the outlet enthalpy predicted by the outlet enthalpy predicting means and the temperature value near the outlet of the compressor calculated by the pressure calculating means. An outlet alternative pressure calculating means for back-calculating the outlet pressure of the compressor, wherein when the pressure near the outlet of the compressor is known, the compressor is calculated from the temperature value near the outlet of the compressor calculated by the temperature calculating means. Exit enthalpy computing means for computing the exit enthalpy of the compressor, and the compression from the exit enthalpy computed by the exit enthalpy computing means. Enthalpy predicting means for predicting the inlet enthalpy of the compressor, and the inlet pressure of the compressor is calculated from the inlet enthalpy predicted by the inlet enthalpy predicting means and the temperature value near the inlet of the compressor calculated by the pressure calculating means. An inlet alternative pressure calculating means, which calculates an outlet superheat degree from the compressor outlet temperature and the outlet pressure, and calculates an inlet superheat degree from the compressor inlet temperature and the inlet pressure, and obtains the obtained outlet superheat degree or inlet superheat. Conventionally, a second control device comprising an actuator drive means for controlling the opening and closing of the outdoor expansion valve so as to keep the value of the degree constant is provided. Although it was necessary, if a pressure sensor was installed in either one, it would be possible to predict and calculate the other pressure, maintaining the conventional control and increasing the cost Can be reduced.

The invention according to claim 3 comprises an outdoor unit including a compressor, an outdoor heat exchanger, an outdoor expansion valve, and an outdoor blower, an expansion valve, a refrigerant distributor, an indoor heat exchanger, and an indoor blower. The indoor unit, the compressor, the indoor heat exchanger, the refrigerant flow divider, the expansion valve,
A compressor inlet temperature sensor installed near an inlet of the compressor, wherein the outdoor heat exchanger and the compressor are sequentially connected in an annular manner with a refrigerant pipe to circulate a refrigerant to form a heating cycle; A compressor outlet temperature sensor installed near the outlet of the compressor, temperature calculating means for converting a temperature signal from the compressor inlet temperature sensor and a temperature signal from the compressor outlet temperature sensor into a temperature value, the compressor inlet temperature sensor, and Temperature sensor abnormality determining means for determining abnormality of the compressor outlet temperature sensor,
First circulating amount calculating means for calculating a circulating amount of the refrigerant from the temperature value calculated by the temperature calculating means; a compressor inlet pressure sensor installed near an inlet of the compressor; and a vicinity of an outlet of the compressor. A compressor outlet pressure sensor, a pressure calculating means for converting a pressure signal from the compressor inlet pressure sensor and a pressure signal from the compressor outlet pressure sensor into a pressure value, the compressor inlet pressure sensor and the compressor outlet Pressure sensor abnormality determination means for determining abnormality of the pressure sensor, second circulation amount calculation means for calculating the circulation amount of the refrigerant from the pressure value calculated by the pressure calculation means, and compression by the temperature sensor abnormality determination means. If it is determined that the inlet temperature sensor is abnormal, the pressure value near the outlet of the compressor calculated by the pressure calculating means and the temperature near the outlet of the compressor calculated by the temperature calculating means Outlet enthalpy calculating means for calculating the outlet enthalpy of the compressor from the above, inlet enthalpy predicting means for predicting the inlet enthalpy of the compressor from the outlet enthalpy calculated by the outlet enthalpy calculating means, and prediction by the inlet enthalpy predicting means An inlet replacement temperature calculating means for back-calculating the inlet temperature of the compressor from the calculated inlet enthalpy and the inlet pressure value of the compressor calculated by the pressure calculating means, and the compressor outlet is determined by the temperature sensor abnormality determining means. When it is determined that the temperature sensor is abnormal, the pressure value near the inlet of the compressor calculated by the pressure calculating means and the temperature value near the inlet of the compressor calculated by the temperature calculating means are calculated based on the temperature of the compressor. An entrance enthalpy calculating means for calculating an entrance enthalpy; and an entrance enthalpy calculated by the entrance enthalpy calculating means. Outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the above, and the outlet temperature of the compressor from the outlet enthalpy predicted by the outlet enthalpy predicting means and the outlet pressure value of the compressor calculated by the pressure calculating means. A temperature value near the outlet of the compressor calculated by the temperature calculating means when the pressure sensor abnormality determining means determines that the compressor inlet pressure sensor is abnormal. Outlet enthalpy calculating means for calculating the outlet enthalpy of the compressor from the pressure value near the outlet of the compressor calculated by the pressure calculating means, and the outlet enthalpy calculated by the outlet enthalpy calculated by the outlet enthalpy calculating means. Entrance enthalpy prediction means for predicting the entrance enthalpy, and the entrance enthalpy predicted by the entrance enthalpy prediction means and An inlet alternative pressure calculating means for back-calculating the compressor inlet pressure from the compressor inlet temperature value calculated by the temperature calculating means, wherein the compressor outlet pressure sensor is determined to be abnormal by the pressure sensor abnormality determining means. When it is determined, the inlet enthalpy of the compressor is calculated from the temperature value near the inlet of the compressor calculated by the temperature calculating means and the pressure value near the inlet of the compressor calculated by the pressure calculating means. Inlet enthalpy calculating means, outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the inlet enthalpy calculated by the inlet enthalpy calculating means, outlet enthalpy predicted by the outlet enthalpy predicting means and the temperature calculating means An outlet alternative pressure calculating means for calculating back the outlet pressure of the compressor from the calculated outlet temperature value of the compressor; The outdoor superheat degree is calculated from the outlet temperature and the outlet pressure, and the inlet superheat degree is calculated from the compressor inlet temperature and the inlet pressure. By providing a third control device comprising an actuator driving means for opening and closing the opening of the expansion valve, a compressor inlet temperature sensor, a compressor inlet pressure sensor and a compressor outlet installed near the inlet and outlet of the compressor 1 are provided. If one of the temperature sensor and the pressure sensor at the compressor outlet becomes abnormal, the abnormal temperature or pressure can be predicted and calculated from the value of the normal temperature sensor or pressure sensor. It is possible to avoid the stop of the device when the sensor or the pressure sensor is abnormal, and to continuously operate the device without impairing the comfort of the indoor environment.

[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 refrigeration cycle diagram of Embodiment 2 of the air conditioner according to the present invention.

FIG. 4 is a flowchart of the air conditioner of the embodiment.

FIG. 5 is a refrigeration cycle diagram of Embodiment 3 of the air conditioner according to the present invention.

FIG. 6 is a flowchart of the air conditioner of the embodiment.

FIG. 7 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 5 Refrigerant splitter 7 Indoor heat exchanger 8 Indoor blower A Outdoor unit B Indoor unit EXP Outdoor expansion valve Cnt1 First control means Cnt2 Second control means Cnt3 Third control means EV expansion Valve Th1 Compressor inlet temperature sensor Th2 Compressor outlet temperature sensor p1 Compressor inlet pressure sensor p2 Compressor outlet pressure sensor

Claims (3)

[Claims] 1. An outdoor unit comprising a compressor, an outdoor heat exchanger, an outdoor expansion valve and an outdoor blower, and an indoor unit comprising an expansion valve, a refrigerant flow divider, an indoor heat exchanger and an indoor blower, The compressor, the indoor heat exchanger, the refrigerant flow divider, the expansion valve, the outdoor heat exchanger, and the compressor are sequentially connected in an annular manner with a refrigerant pipe to circulate the refrigerant to form a heating cycle, A compressor temperature sensor installed near one of the inlet and outlet pipes of the compressor, and a temperature sensor installed to determine whether the compressor temperature sensor is installed at either the inlet or the outlet of the compressor. Determining means, temperature calculating means for converting a temperature signal from the compressor temperature sensor into a temperature value, a compressor inlet pressure sensor installed near the compressor inlet, and installed near the compressor outlet. A compressor outlet pressure sensor, a pressure calculating means for converting pressure signals from the compressor inlet pressure sensor and the compressor outlet pressure sensor into a pressure value, and the refrigerant based on the pressure value calculated by the pressure calculating means. Circulating amount calculating means for calculating the circulating amount of the compressor, when the temperature near the inlet of the compressor is known, the inlet enthalpy of the compressor is calculated from the pressure value near the inlet of the compressor calculated by the pressure calculating means. Inlet enthalpy calculating means for calculating, outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the inlet enthalpy calculated by the inlet enthalpy calculating means, outlet enthalpy predicted by the outlet enthalpy predicting means and the pressure calculation Outlet alternative temperature calculating means for back-calculating the compressor outlet temperature from the pressure value near the compressor outlet calculated by the means. An outlet enthalpy calculating means for calculating an outlet enthalpy of the compressor from a pressure value near the outlet of the compressor calculated by the pressure calculating means when a temperature near the outlet of the compressor is known; Inlet enthalpy predicting means for predicting the inlet enthalpy of the compressor from the outlet enthalpy calculated in the above, and the inlet enthalpy predicted by the inlet enthalpy predicting means and the pressure near the inlet of the compressor calculated by the pressure calculating means An inlet replacement temperature calculating means for calculating the inlet temperature of the compressor from the value back, and calculating an outlet superheat degree from the compressor outlet temperature and outlet pressure, and calculating an inlet superheat degree from the compressor inlet temperature and inlet pressure. Actuator driving means for controlling the opening / closing of the outdoor expansion valve so that the obtained value of the outlet superheat degree or the obtained inlet superheat degree becomes constant. An air conditioning apparatus characterized by comprising a Ranaru first controller. 2. An outdoor unit including a compressor, an outdoor heat exchanger, an outdoor expansion valve, and an outdoor blower, and an indoor unit including an expansion valve, a refrigerant flow divider, an indoor heat exchanger, and an indoor blower, The compressor, the indoor heat exchanger, the refrigerant flow divider, the expansion valve, the outdoor heat exchanger, and the compressor are sequentially connected in an annular manner with a refrigerant pipe to circulate the refrigerant to form a heating cycle, A compressor pressure sensor installed near one of the inlet and outlet pipes of the compressor, and a pressure sensor installed to determine whether the compressor pressure sensor is installed at either the inlet or the outlet of the compressor. Determining means, pressure calculating means for converting a pressure signal from the compressor pressure sensor into a pressure value, a compressor inlet temperature sensor installed near the compressor inlet, and installed near the compressor outlet A compressor outlet temperature sensor, a temperature calculating means for converting a temperature signal from the compressor inlet temperature sensor and a temperature signal from the compressor outlet temperature sensor into a temperature value, and the refrigerant based on the temperature value calculated by the temperature calculating means. Circulating amount calculating means for calculating the circulating amount of the compressor, when the pressure near the inlet of the compressor is known, the inlet enthalpy of the compressor is calculated from the temperature value near the inlet of the compressor calculated by the temperature calculating means. Inlet enthalpy calculating means for calculating, outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the inlet enthalpy calculated by the inlet enthalpy calculating means, outlet enthalpy predicted by the outlet enthalpy predicting means and the pressure calculation Outlet alternative pressure calculating means for back-calculating the compressor outlet pressure from the temperature value near the outlet of the compressor calculated by the means. When the pressure near the outlet of the compressor is known, outlet enthalpy calculating means for calculating the outlet enthalpy of the compressor from the temperature value near the outlet of the compressor calculated by the temperature calculating means, and the outlet enthalpy calculating means Inlet enthalpy predicting means for predicting the inlet enthalpy of the compressor from the outlet enthalpy calculated in the above, and the inlet enthalpy predicted by the inlet enthalpy predicting means and the temperature near the inlet of the compressor calculated by the pressure calculating means An inlet alternative pressure calculating means for back-calculating the compressor inlet pressure from the value, calculating an outlet superheat degree from the compressor outlet temperature and outlet pressure, and calculating an inlet superheat degree from the compressor inlet temperature and inlet pressure. Actuator driving means for controlling the opening / closing of the outdoor expansion valve so that the obtained value of the outlet superheat degree or the obtained inlet superheat degree becomes constant. An air conditioning apparatus characterized by comprising a Ranaru second controller. 3. An outdoor unit including a compressor, an outdoor heat exchanger, an outdoor expansion valve, and an outdoor blower, and an indoor unit including an expansion valve, a refrigerant flow divider, an indoor heat exchanger, and an indoor blower, The compressor, the indoor heat exchanger, the refrigerant flow divider, the expansion valve, the outdoor heat exchanger, and the compressor are sequentially connected in an annular manner with a refrigerant pipe to circulate the refrigerant to form a heating cycle, A compressor inlet temperature sensor installed near the inlet of the compressor, a compressor outlet temperature sensor installed near the outlet of the compressor, and temperature signals from the compressor inlet temperature sensor and the compressor outlet temperature sensor. To a temperature value, a temperature sensor abnormality determining means for determining an abnormality of the compressor inlet temperature sensor and the compressor outlet temperature sensor, and the cooling means for calculating the temperature from the temperature value calculated by the temperature calculating means. A first circulation amount calculating means for calculating a circulation amount of the compressor; a compressor inlet pressure sensor installed near an inlet of the compressor; a compressor outlet pressure sensor installed near an outlet of the compressor; Pressure calculating means for converting a pressure signal from the compressor inlet pressure sensor and the compressor outlet pressure sensor into a pressure value; pressure sensor abnormality determining means for determining abnormality of the compressor inlet pressure sensor and the compressor outlet pressure sensor; A second circulation amount calculation unit that calculates a circulation amount of the refrigerant from the pressure value calculated by the pressure calculation unit; and a case where the compressor inlet temperature sensor is determined to be abnormal by the temperature sensor abnormality determination unit. An output enthalpy of the compressor is calculated from a pressure value near the outlet of the compressor calculated by the pressure calculating means and a temperature value near the outlet of the compressor calculated by the temperature calculating means. Enthalpy calculating means; inlet enthalpy predicting means for predicting the inlet enthalpy of the compressor from the outlet enthalpy calculated by the outlet enthalpy calculating means; An inlet replacement temperature calculating means for back-calculating the inlet temperature of the compressor from the calculated inlet pressure value of the compressor, wherein the temperature sensor abnormality determining means determines that the compressor outlet temperature sensor is abnormal. Inlet enthalpy calculating means for calculating the inlet enthalpy of the compressor from the pressure value near the inlet of the compressor calculated by the pressure calculating means and the temperature value near the inlet of the compressor calculated by the temperature calculating means; An outlet for predicting the outlet enthalpy of the compressor from the inlet enthalpy calculated by the inlet enthalpy calculating means Enthalpy predicting means, and an outlet alternative temperature calculating means for back-calculating the outlet temperature of the compressor from the outlet enthalpy predicted by the outlet enthalpy predicting means and the outlet pressure value of the compressor calculated by the pressure calculating means. When the pressure sensor abnormality determination means determines that the compressor inlet pressure sensor is abnormal, the temperature value near the compressor outlet calculated by the temperature calculation means and the compression calculated by the pressure calculation means are calculated. Outlet enthalpy calculating means for calculating the outlet enthalpy of the compressor from the pressure value near the outlet of the compressor, and inlet enthalpy predicting means for predicting the inlet enthalpy of the compressor from the outlet enthalpy calculated by the outlet enthalpy calculating means, The inlet enthalpy predicted by the inlet enthalpy predicting means and the inlet of the compressor calculated by the temperature calculating means An inlet alternative pressure calculating means for back-calculating the inlet pressure of the compressor from a degree value, wherein when the pressure sensor abnormality determining means determines that the compressor outlet pressure sensor is abnormal, the temperature is calculated by the temperature calculating means. Inlet enthalpy calculating means for calculating the inlet enthalpy of the compressor from the temperature value near the inlet of the compressor and the pressure value near the inlet of the compressor calculated by the pressure calculating means; Outlet enthalpy predicting means for predicting the outlet enthalpy of the compressor from the determined inlet enthalpy, and the compression based on the outlet enthalpy predicted by the outlet enthalpy predicting means and the outlet temperature value of the compressor calculated by the temperature calculating means. An outlet alternative pressure calculating means for calculating the outlet pressure of the compressor back, and calculating an outlet superheat degree from the compressor outlet temperature and the outlet pressure. Actuator drive means for calculating an inlet superheat degree from the compressor inlet temperature and the inlet pressure, and controlling the opening and closing of the outdoor expansion valve so that the obtained outlet superheat degree or inlet superheat degree becomes constant. An air conditioner comprising a third control device comprising: