JPH07174386A - Separate type air-conditioning machine - Google Patents

Abstract

PURPOSE:To prevent the damaging of a compressor by operating an air- conditioning machine while closing either both or one of operating valves as they are due to faulty work or the like. CONSTITUTION:A separate type air-conditioning machine is provided with a heat exchanging temperature sensor 19, detecting the temperature of an indoor heat exchanger 6, a frequency judging means 21, judging whether the operating frequency of a compressor 1 is higher than a reference value or not, and a deciding means 22, deciding that operating valves 3, 11 are closed when the operating frequency is higher than the reference value and the detecting temperature of the heat exchanging temperature sensor 19 is not lower than a predetermined value upon cooling or not higher than a predetermined value upon heating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separation type air conditioner.

[0002]

2. Description of the Related Art A refrigerant circuit of a conventional air conditioner is shown in FIG. O is an outdoor unit, which includes an inverter 17, a compressor 1, a four-way valve 2, an outdoor heat exchanger 14, an outdoor fan 15, a check valve 12, a cooling throttle 13, operation valves 3 and 11, and the like. I
Is an indoor unit, which is provided with an indoor heat exchanger 6, an indoor fan 16, a heating throttle 7, a check valve 8, pipe joints 5 and 9, and the like.
The outdoor unit O and the indoor unit I are connected to the connecting pipe 4
And 10 via one another.

The compressor 1 is driven by a current supplied from a commercial power source 18 via an inverter 17, and the inverter 17
By changing the frequency of this current, the rotational speed of the compressor 1, that is, the capacity can be controlled.

During the heating operation of the air conditioner, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2, the operation valve 3, the connecting pipe 4, the pipe joint 5 as shown by the solid arrow. The heat enters the indoor heat exchanger 6 and radiates heat to the indoor air sent by the indoor fan 16 to be condensed and liquefied into a high-pressure liquid refrigerant. This liquid refrigerant is adiabatically expanded by being throttled by the heating throttle 7, and becomes a low-pressure liquid gas two-phase refrigerant.
This liquid gas two-phase refrigerant is used for pipe joint 9, connecting pipe 10, operating valve 1
1. After entering the outdoor heat exchanger 14 via the check valve 12, the heat is absorbed from the outside air sent by the outdoor fan 15 to evaporate and become a low-pressure gas refrigerant. Then, this gas refrigerant is sucked into the compressor 1 through the four-way valve 2.

On the other hand, during the cooling operation, the gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 and is condensed in the outdoor heat exchanger 14 into a high-pressure liquid refrigerant, as shown by the broken line arrow, and the cooling throttle 13 It becomes a low-pressure liquid gas two-phase refrigerant by being throttled by. Then, the liquid gas two-phase refrigerant is evaporated in the indoor heat exchanger 6 through the operation valve 11, the connecting pipe 10, the pipe joint 9, and the check valve 8 to become a low-pressure gas refrigerant. This gas refrigerant is pipe joint 5,
It returns to the compressor 1 through the connection pipe 4, the operation valve 3, and the four-way valve 2.

In the outdoor unit O of this separation type air conditioner, a required refrigerant is enclosed in the refrigerant circuit to operate the operation valves 11 and 3.
Is shipped from the factory, and the indoor unit I is shipped from the factory with the connecting pipes 4 and 10 connected thereto.

The outdoor unit O and the indoor unit I are installed at predetermined places, and then the connection pipe 10 is connected to the operation valve 11 and the connection pipe 4 is connected to the operation valve 3. Next, after slightly loosening the flare nut for connecting the connection pipe 4 to the operation valve 3, the operation valve 11 is opened.

Then, the refrigerant enclosed in the refrigerant circuit of the outdoor unit O flows into the refrigerant circuit of the indoor unit I through the operation valve 11 and the connection pipe 10, and accordingly, the connection pipe 10 and the indoor unit. Air in the refrigerant circuit of I passes through the connecting pipe 4 and is extruded to the outside through the loosened flare nut of the operation valve 3. When a small amount of refrigerant leaks from the gap of the flare nut, the flare nut is tightened and the operation valve 3 is fully opened to complete the installation work of the separation type air conditioner.

When the operation of this air conditioner is started, the operating frequency of the compressor 1 gradually rises. The temperature of the indoor heat exchanger 6 changes during the heating operation as indicated by the curve a in FIG. 5, and during the cooling operation the temperature of the indoor heat exchanger 6 changes as indicated by the curve b.

However, if both or one of the operation valves 3 and 11 is left open due to an installation error or the like, the temperature of the indoor heat exchanger 6 hardly changes because the refrigerant does not circulate in the indoor heat exchanger 6. Therefore, the temperature of the indoor heat exchanger 6 changes as shown by the curve C during the heating operation, and changes as shown by the curve D during the cooling operation.

[0011]

In the above conventional air conditioner, if the air conditioner is operated without opening both or one or both of the operation valves 11 and 3 due to a construction error or the like, an excessive load is applied to the compressor 1. There was a risk that it could be damaged by damage.

[0012]

The present invention has been invented to solve the above-mentioned problems, and the gist of the first invention is at least an inverter-driven compressor, an outdoor heat exchanger, and piping. In a separation type air conditioner in which an outdoor unit equipped with a connection operation valve and at least an indoor unit equipped with an indoor heat exchanger are connected via a connection pipe, heat for detecting the temperature of the indoor heat exchanger An exchange temperature sensor, a frequency determination means for determining whether the operating frequency of the compressor is equal to or higher than a reference value, and at the start of operation, when the operating frequency is equal to or higher than the reference value and the temperature detected by the heat exchange temperature sensor is in a cooling operation. When the value is less than the specified value and does not exceed the specified value during heating operation,
A separate type air conditioner is provided with a protection device including a determination means for determining that the operation valve is closed.

The gist of the second aspect of the invention is to connect an outdoor unit having at least an inverter-driven compressor, an outdoor heat exchanger, an operation valve for pipe connection, and an indoor unit having at least an indoor heat exchanger. In a separation type air conditioner connected via piping, a heat exchange temperature sensor for detecting the temperature of the indoor heat exchanger, a suction air temperature sensor for detecting the suction air temperature of the indoor heat exchanger, and these A calculating means for obtaining a temperature difference between the detected values of the temperature sensor, a frequency judging means for judging whether or not the operating frequency of the compressor is a reference value or more, and at the start of operation, the operating frequency is the reference or more and the temperature difference is A separate type air conditioner is provided with a protection device including a determination means for determining that the operation valve is closed when the value is equal to or less than a reference value.

When it is determined that the operation valve is closed, the protection device can be provided with an abnormality display means for displaying this and an abnormal stop means for stopping the operation of the compressor.

[0015]

According to the first aspect of the present invention, when the frequency determining means determines that the operating frequency of the compressor has become equal to or higher than the reference value by starting the operation of the air conditioner, the indoor heat detected by the heat exchange temperature sensor is detected. When the temperature of the exchanger does not reach the predetermined value during the cooling operation or above the predetermined value during the heating operation, the determination means determines that the operation valve is closed.

In the second aspect of the invention, when the frequency determining means determines that the operating frequency of the compressor has become equal to or higher than the reference value by starting the operation of the air conditioner, the indoor heat detected by the heat exchange temperature sensor. The temperature difference between the temperature of the exchanger and the suction air temperature of the indoor heat exchanger detected by the suction air temperature sensor is calculated by the calculation means, and if this is below the reference value, the judgment means indicates that the operation valve is closed. judge.

When it is determined that the operation valve is closed, this can be displayed by the abnormality display means, and the compressor can be stopped by the abnormality stop means.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the invention is shown in FIG. A heat exchange temperature sensor 19 for detecting this temperature is attached to the indoor heat exchanger 6. Reference numeral 20 is a protection device, which is a frequency judging means 21, a judging means 22, an abnormal stopping means 23, and an abnormal displaying means.
24, reference value setting means 25, cooling predetermined value setting means 26, and heating predetermined value setting means 27. Other configurations are similar to those of the conventional one shown in FIG. 4, and corresponding members are designated by the same reference numerals.

However, when the operation of the air conditioner is started, the operating frequency of the compressor 1 gradually rises. This operating frequency is input to the frequency determining means 21 and compared with the reference value input from the reference value setting means 25. The frequency determining means 21 determines whether or not the operating frequency is equal to or higher than the reference value, and outputs a determination command to the determining means 22 when the operating frequency is higher than the reference value. On the other hand, the temperature of the indoor heat exchanger 6 detected by the heat exchange temperature sensor 19 is input to the determination means 22.

When the judging means 22 receives the judgment command from the frequency judging means 21, the judging means 22 compares the temperature of the indoor heat exchanger 6 with the cooling predetermined value inputted from the cooling predetermined value setting means 26 during the cooling operation, During the heating operation, the heating predetermined value input from the heating predetermined value setting means 27 is compared. Then, when the former is below the latter during the cooling operation, and when the former is above the latter during the heating operation, it is determined that the operation valve is closed and the determination result is output to the abnormal stop means 23 and the abnormality display means 24. Then, the abnormal stop means 23 outputs it to the compressor 1 to stop it, and the abnormality display means 24 displays an abnormality.

Thus, by continuing the operation of the air conditioner with both or one of the operation valves 3 and 11 closed, it is possible to prevent the compressor 1 from being overloaded and damaged.

A second embodiment of the invention is shown in FIGS. In the second embodiment, the temperature of the indoor heat exchanger 6 detected by the heat exchange temperature sensor 19 and the indoor heat exchanger 6 detected by the intake air temperature sensor 31.
The intake air temperature, that is, the room temperature, is input to the calculating means 32 provided in the protection device 30, and the calculating means 32 calculates the temperature difference between these detected temperatures and inputs it to the determining means 33.

When the judgment means 33 receives the judgment command from the frequency judgment means 21, it compares this temperature difference with the reference value input from the reference value setting means 34, and when the former is the latter or less, the operation valve is closed. It is determined that there is, and the determination result is output to the abnormal stop means 23 and the abnormality display means 24.

FIG. 3 shows the relationship between the temperature difference and the operating frequency. When the operating valves 3 and 11 are fully opened, the temperature difference changes as shown by the solid line B in FIG. When both or one of them is closed, the temperature difference changes as shown by the broken line B in FIG. Therefore, if a reference value is set as shown by the one-dot chain line C in FIG. 3 and stored in the reference value setting means 34, it can be reliably determined whether or not the operation valves 3 and 11 are closed. Other configurations are similar to those of the conventional one shown in FIG. 4, and corresponding members are designated by the same reference numerals.

In the second embodiment, whether the operating valve is closed or not can be reliably determined regardless of the room temperature.

[0026]

According to the first aspect of the present invention, when the frequency determining means determines that the operating frequency of the compressor has become equal to or higher than the reference value by starting the operation of the air conditioner, it is detected by the heat exchange temperature sensor. When the temperature of the indoor heat exchanger does not reach the predetermined value during the cooling operation or above the predetermined value during the heating operation, the determining means determines that the operation valve is closed. As a result, it is possible to prevent the compressor from being damaged by continuing the operation of the air conditioner with the operation valve closed. Also, when the operating frequency of the compressor is above the reference value, it is determined whether the operating valve is closed.Therefore, it is determined when the operating frequency of the compressor is below the reference value and the compressor is overloaded. It is possible to prevent the means from making an erroneous determination.

In the second aspect of the present invention, when the frequency determining means determines that the operating frequency of the compressor has exceeded the reference value by starting the operation of the air conditioner, the indoor heat detected by the heat exchange temperature sensor. The temperature difference between the temperature of the exchanger and the suction air temperature of the indoor heat exchanger detected by the suction air temperature sensor is calculated by the calculation means, and if this is below the reference value, the judgment means indicates that the operation valve is closed. judge. Therefore, since the determination is made based on the relative relationship between the temperature difference between the temperature of the indoor heat exchanger and the intake air temperature of the indoor heat exchanger and the operating frequency of the compressor, the determination can be made reliably regardless of the room temperature.

When it is determined that the operation valve is closed, this is displayed by the abnormality display means, and the compressor is stopped by the abnormal stop means, so that the compressor can be reliably prevented from being damaged and the operation valve is prevented. Since it can be recognized that the air conditioner is closed, the operation valve can be immediately opened to promptly restart the operation of the air conditioner.

[Brief description of drawings]

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

FIG. 2 is a system diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram for explaining a reference value in the second embodiment.

FIG. 4 is a refrigerant circuit diagram of a conventional separation type air conditioner.

FIG. 5 is a diagram showing a temporal change in temperature of the indoor heat exchanger at the beginning of operation.

[Explanation of symbols]

 O Outdoor unit 1 Inverter driven compressor 14 Outdoor heat exchanger 3, 11 Piping connection control valve I Indoor unit 6 Indoor heat exchanger 4, 10 Connection piping 20 Protective device 19 Heat exchanger temperature sensor 21 Frequency judgment means 25 Reference value setting Means 22 Judging means 26 Cooling predetermined value setting means 27 Heating predetermined value setting means 23 Abnormal stop means 24 Abnormality display means

Claims (3)

[Claims] 1. An outdoor unit including at least an inverter-driven compressor, an outdoor heat exchanger, and a pipe connecting operation valve,
In a separation type air conditioner formed by connecting at least an indoor unit equipped with an indoor heat exchanger through a connection pipe,
A heat exchange temperature sensor for detecting the temperature of the indoor heat exchanger,
Frequency determining means for determining whether the operating frequency of the compressor is equal to or higher than a reference value, and at the start of operation, the operating frequency is equal to or higher than the reference value and the temperature detected by the heat exchange temperature sensor is equal to or lower than a predetermined value during cooling operation, and heating is performed. A separation type air conditioner comprising a protection device comprising a determination means for determining that the operation valve is closed when the value does not exceed a predetermined value during operation. 2. An outdoor unit including at least an inverter-driven compressor, an outdoor heat exchanger, and a pipe connecting operation valve,
In a separation type air conditioner formed by connecting at least an indoor unit equipped with an indoor heat exchanger through a connection pipe,
A heat exchange temperature sensor for detecting the temperature of the indoor heat exchanger,
A suction air temperature sensor for detecting the suction air temperature of the indoor heat exchanger, a calculating means for obtaining the temperature difference between the detected values of these temperature sensors, and a frequency for judging whether or not the operating frequency of the compressor is equal to or higher than a reference value. Judgment means, at the start of operation, when the operating frequency is above the reference and the temperature difference is below the reference value,
A separation type air conditioner comprising a protection device comprising a determination means for determining that the operation valve is closed. 3. The protection device includes an abnormality display means for displaying the operation valve when it is determined that the operation valve is closed, and an abnormal stop means for stopping the operation of the compressor. The separation type air conditioner according to 1 or 2.