JPH08226714A - Air conditioning equipment - Google Patents

Abstract

PURPOSE: To prevent breakage of the compressor while speeding up the start of air conditioning operation by checking a liquid compression as caused by the retention of a liquid refrigerant in a compressor when the compressor is stopped. CONSTITUTION: While a compressor 1 is halted, a liquid refrigerant medium quantity detection means 8 outputs a signal when the amount of a liquid refrigerant retained in the compressor 1 exceeds a specified value and when inputting the signal, a controller 7 feeds a very weak high frequency open phase current to a winding of a motor 5 to warm a motor winding so that a liquid compression caused by a low temperature retention of the liquid refrigerant is checked to prevent the breakage of the compressor while speeding up the start of air conditioning operation. Moreover, it is possible to feed an open phase only when the temperature of a representing section of the compressor 1 is below a specified value or an outdoor air temperature below the specified value and it is also possible to lower an energization power consumption by making the feeding of the open phase intermittent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using a compressor.

[0002]

2. Description of the Related Art In recent years, air conditioners have become widespread, but their reliability, particularly the damage of the compressor due to compression of the liquid refrigerant at the time of startup, is a problem.

A conventional air conditioner will be described below. Conventionally, in an air conditioner, when the refrigeration cycle is stopped for a long time and the compressor is kept at a low temperature, liquid refrigerant stagnates in the compressor suction pipe line, causing liquid compression at startup and excessive axial torque. In addition, it may cause compressor damage. In order to prevent this phenomenon from occurring, it starts up in reverse rotation at startup, sucks gas from the projecting port and discharges it from the suction port, pushes back the liquid refrigerant that has laid down in the suction pipe line, and then stops and restarts again. By starting by rotation, gas was mainly sucked in to prevent liquid compression.

[0004]

In such a conventional air conditioner, the above-described operation of starting in reverse rotation at the time of starting and then stopping and starting again in forward rotation delays the start-up of the refrigeration cycle, and There is a problem that it is disadvantageous in terms of comfort performance required for the air conditioner.

The present invention solves the above-mentioned problems by accurately detecting liquid refrigerant stagnation, and without excessively impairing the startup performance of the air conditioner, excessive axial torque at startup due to liquid refrigerant stagnation, and further, a compressor. An object is to provide an air conditioner that prevents damage.

[0006]

The present invention according to claim 1 is an air conditioner provided with a compressor, an indoor heat exchanger, and an outdoor heat exchanger, the air conditioner being provided inside the compressor, A liquid refrigerant amount detection means for outputting a signal when the amount of liquid refrigerant inside the compressor becomes a set amount or more, a compressor power supply circuit, and a control device for controlling the operation of the entire device, the control device, When the output signal of the liquid refrigerant amount detection means is continuously output for a predetermined time or longer when the compressor is stopped, the compressor power supply circuit is configured to flow a weak high frequency open phase current to the motor of the compressor. The present invention according to claim 2 is provided with a compressor temperature detecting means for outputting a signal when the temperature of the representative part of the compressor is below a predetermined value, and the control means is Liquid cooling when the compressor is stopped The compressor power supply circuit is controlled so that a weak high-frequency open-phase current flows through the motor of the compressor when both the signal of the quantity detecting means and the signal of the compressor temperature detecting means are output. The present invention relates to an air conditioner, and the present invention according to claim 3 is provided with an outdoor temperature detecting means for outputting a signal when the outdoor air temperature becomes equal to or lower than a predetermined value, and the control means, when the compressor is stopped,
The compressor power supply circuit is controlled so that a weak high-frequency open-phase current is caused to flow through the motor of the compressor when both the signal of the liquid refrigerant amount detection means and the signal of the outdoor air temperature detection means are output. In the present invention according to claim 4, the control means repeats energization of a weak high frequency open phase current flowing through the motor of the compressor for a predetermined time and for a predetermined time. The air conditioner according to any one of claims 1 to 3, which controls the compressor power supply circuit as described above.

[0007]

In the present invention according to claim 1, when the compressor is stopped, the liquid refrigerant amount detecting means detects the amount of liquid refrigerant accumulated inside the compressor and outputs a signal if the amount is equal to or more than a predetermined amount. Then, when the signal is input, the control means causes a weak high-frequency open-phase current to flow in the motor of the compressor to warm the motor windings and eliminate the low temperature stagnation of the liquid refrigerant. In the present invention according to claim 2, when the compressor is stopped,
The compressor temperature detecting means detects the temperature of the representative portion of the compressor and outputs a signal if the temperature is less than or equal to a predetermined value, and the control means outputs the signal of the liquid refrigerant amount detecting means and the signal of the compressor temperature detecting means. When both are input, a weak high-frequency open-phase current is passed through the motor of the compressor to warm the motor windings, eliminating the low temperature stagnation of the liquid refrigerant. The open-phase current is effectively energized only when the temperature of the representative part of the compressor is below a predetermined value. Further, in the present invention according to claim 3, when the compressor is stopped, the outdoor air temperature detecting means detects the outdoor air temperature and outputs a signal if the outdoor air temperature is below a predetermined value, and the control means controls the liquid refrigerant amount. When both the signal of the detection means and the signal of the outdoor temperature detection means are input, a weak high-frequency open-phase current is supplied to the motor of the compressor to warm the motor windings, thereby eliminating the low temperature stagnation of the liquid refrigerant. The open-phase current is effectively energized only when the outdoor temperature is below a predetermined value. Further, in the present invention according to claim 4, the energization pattern of the high-frequency open-phase current is repeated by repeating energization for a predetermined time and disconnection for a predetermined time to reduce the power consumption of the open-phase current overheating.

[0008]

【Example】

(Embodiment 1) An embodiment of the air conditioner of the present invention will be described below with reference to the drawings. FIG. 1 is a principal block diagram showing the configuration of the present embodiment. In the figure, 1 is a compressor, 2 is a compression part of the compressor 1, 2a is an orbiting scroll in the compression part 2, 2b is a fixed scroll, 3 is a suction pipe line, 4 is a discharge pipe line, 5 is a motor, and 6 is Compressor power supply circuit,
Reference numeral 7 is a control device, and 8 is a flow switch or the like provided in the suction pipe line 3, and is a liquid refrigerant amount detection means which gives an output signal when the amount of the liquid refrigerant in the compressor 1 becomes a set amount or more.

The mutual relationship and operation of the above components will be described. When the compressor 1 of the air conditioner is stopped, the control device 7 measures the output of the liquid refrigerant amount detection means 8 and determines whether the output is continuous for a predetermined time or longer. When it is determined that the output from the liquid refrigerant amount detection means 8 is continuous for a predetermined time or longer, the control device 7 causes a weak high frequency open phase current to flow through the winding of the motor 5 as shown in FIG. Thus, the compressor power supply circuit 6 is controlled. FIG. 2A shows the winding and current of the motor 5. As shown in the figure, the currents I1 and I1 'are alternately flowed at intervals only in the U phase and the V phase with the W phase missing. FIG. 2B is a timing chart showing the energized state of the current.

In this way, the liquid refrigerant amount detecting means 8
When the compressor 1 is stopped, it is detected that a certain amount or more of liquid refrigerant is accumulated in the compressor 1, and an open-phase current is passed to warm the motor winding of the compressor 1 to load the compressor at the time of startup. Therefore, it is possible to prevent excessive axial torque at startup due to liquid refrigerant stagnation and further damage to the compressor without impairing the start-up performance of the air conditioner.

(Embodiment 2) An embodiment of the air conditioner according to the present invention will be described below with reference to the drawings. The same components as those in FIG. 1 are assigned the same reference numerals and detailed explanations thereof will be omitted. The present embodiment is different from the first embodiment in that a compressor temperature detecting means 9 is provided in addition to the configuration shown in FIG. 1, and when the temperature of the representative part of the compressor 1 becomes equal to or lower than a set temperature, the output is sent to the control device 7. I have tried to give it.

The operation of the above configuration will be described. When the compressor 1 is stopped, the control device 7 indicates that the output of the liquid refrigerant amount detecting means 8 is continuous for a predetermined time or longer, and the temperature of the representative portion of the compressor 1 detected by the compressor temperature detecting means 9 at that time is When the temperature is below the set temperature, the winding of the motor 5 is
The compressor power supply circuit 6 is controlled so that the weak high-frequency open-phase current shown in FIG. Therefore, the open phase current is prevented from flowing when the temperature of the compressor 1 is higher than a predetermined value.
By the above operation, the temperature of the winding of the motor 5 rises, the load at the time of starting the compressor can be reduced, and the axial torque at the time of starting is excessive due to liquid refrigerant stagnation without impairing the start-up performance of the air conditioner. Further, it is possible to prevent the compressor from being damaged.

As is apparent from the above operation, the liquid refrigerant amount detecting means 8 detects that a certain amount or more of the liquid refrigerant stays in the compressor 1 when the compressor 1 is stopped, and the compressor temperature When the detection unit 9 detects that the temperature of the compressor 1 is lower than a predetermined value, a weak high-frequency open-phase current is passed through the motor winding of the compressor 1 to raise the temperature of the compressor 1 and warm the refrigerant. By doing so, the open-phase current flows only when the temperature of the compressor 1 is equal to or lower than the predetermined value, so that the load at the time of starting the compressor can be reduced more effectively and the startup performance of the air conditioner can be improved. It is possible to prevent an excessive shaft torque at the time of start-up due to the liquid refrigerant stagnation and further damage to the compressor without damage.

(Embodiment 3) An embodiment of the present invention according to claim 3 will be described below with reference to the drawings. FIG. 4 is a block diagram showing the configuration of this embodiment. The same components as those in FIG. 1 are assigned the same reference numerals and detailed explanations thereof will be omitted. The present embodiment is different from the first embodiment in that, in addition to the configuration shown in FIG. 1, the air conditioner outer box 11 is provided with the outdoor air temperature detecting means 10 so that the open-phase current flows according to the outdoor air temperature. There is something I did.

The operation of the above configuration will be described. When the compressor 1 is stopped, the control device 7 controls the compressor when the output of the liquid refrigerant amount detection means 8 is continuous for a predetermined time or longer and when the output of the outdoor air temperature detection means 10 is equal to or lower than a predetermined temperature. The compressor power supply circuit 6 is controlled so that the weak high-frequency open-phase current shown in FIG. Therefore, when the outdoor temperature exceeds a predetermined value, the open phase current is not passed.

As is apparent from the above operation, the liquid refrigerant amount detecting means 8 detects that the liquid refrigerant having a predetermined value or more is accumulated in the compressor 1, and the outdoor air temperature detecting means 10 determines the outdoor air temperature. When it is detected that it is less than the value,
By applying a weak high-frequency open-phase current to the compressor motor winding to raise the temperature of the compressor 1, the open-phase current flows only when the outdoor air temperature is equal to or lower than a predetermined value. Correspondingly, it is possible to reduce the load at the time of starting the compressor, and prevent excessive axial torque at the time of starting due to liquid refrigerant stagnation without damaging the start-up performance of the air conditioner, and further preventing damage to the compressor. You can

(Embodiment 4) An embodiment of the present invention according to claim 4 will be described below with reference to the drawings. The configuration of this embodiment is the same as that shown in FIG.
The present embodiment differs from the first embodiment in the energization pattern of the high frequency open phase current.

The operation of this embodiment will be described below. FIG. 5 is a timing chart showing an energized state of a weak high frequency open-phase current flowing through the compressor motor winding in the present embodiment.
In the present embodiment, when the refrigerant stagnation is detected by the liquid refrigerant amount detection means 8 and a weak high-frequency current is passed through the motor winding of the compressor 1, energization of the pattern shown in FIG. The compressor power supply circuit 6 is controlled to repeat ON and OFF for a predetermined time. By this operation, it is possible to reduce the load at the time of starting the compressor by raising the temperature of the compressor 1 and warming the refrigerant while suppressing the power consumption to the minimum, and to reduce the load without impairing the start-up performance of the air conditioner. It is possible to prevent excessive axial torque at the time of startup due to refrigerant stagnation and further damage to the compressor.

[0019]

As is apparent from the above description, the present invention according to claim 1 is an air conditioner equipped with a compressor, an indoor heat exchanger, and an outdoor heat exchanger, Liquid refrigerant amount detection means provided inside, which outputs a signal when the amount of liquid refrigerant inside the compressor is equal to or greater than a set amount,
A compressor power supply circuit and a control device for controlling the operation of the entire device are provided, and the control device outputs the output signal of the liquid refrigerant amount detection means continuously for a predetermined time or more when the compressor is stopped. By controlling the compressor power supply circuit so that a weak high-frequency open-phase current flows to the motor of the compressor when the temperature is low, the low temperature retention of the liquid refrigerant that accumulates inside the compressor is eliminated, and the compressor is damaged. It is possible to prevent the above and to quickly start the air conditioning operation. Further, the present invention according to claim 2 is provided with a compressor temperature detecting means for outputting a signal when the temperature of the representative portion of the compressor becomes equal to or lower than a predetermined value, and the control means is provided when the compressor is stopped. By controlling the compressor power supply circuit so that a weak high-frequency open-phase current flows to the motor of the compressor when both the signal of the liquid refrigerant amount detection means and the signal of the compressor temperature detection means are output. ,
Since the high frequency open phase current is passed only when the temperature of the representative portion of the compressor is equal to or lower than the predetermined value, it is possible to effectively warm the compressor. Further, the present invention according to claim 3 is provided with an outdoor temperature detecting means for outputting a signal when the outdoor air temperature becomes equal to or lower than a predetermined value, and the control means controls the liquid refrigerant amount detecting means when the compressor is stopped. By controlling the compressor power supply circuit so that a weak high-frequency open-phase current flows to the motor of the compressor when both the signal and the signal from the outdoor air temperature detecting means are output, the outdoor air temperature is below a predetermined value. Since the high-frequency open-phase current is supplied only at certain times, the compressor can be effectively warmed. In the present invention according to claim 4, the control means controls the compressor power supply circuit to repeat energization of a weak high-frequency open-phase current flowing through the motor of the compressor for a predetermined time and for a predetermined time. By controlling, it is possible to reduce power consumption during high frequency open phase energization.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an air conditioner of the present invention according to claim 1.

FIG. 2 is a schematic diagram and a timing chart of a motor winding showing a conduction state of a high frequency open phase current in the air conditioner of the present invention according to claims 1 to 3.

FIG. 3 is a block diagram showing the configuration of an embodiment of the air conditioner of the present invention according to claim 2;

FIG. 4 is a block diagram showing the configuration of an embodiment of the air conditioner of the present invention according to claim 3;

FIG. 5 is a timing chart showing an energized state of a high frequency open phase current in the air conditioner of the present invention according to claim 4;

[Explanation of symbols]

 1 Compressor 5 Motor 6 Compressor Power Supply Circuit 7 Control Device 8 Liquid Refrigerant Amount Detection Means 9 Compressor Temperature Detection Means 10 Outdoor Air Temperature Detection Means

Claims (4)

[Claims] 1. An air conditioner comprising a compressor, an indoor heat exchanger, and an outdoor heat exchanger, wherein the amount of liquid refrigerant inside the compressor is equal to or greater than a set amount. Liquid refrigerant amount detection means that outputs a signal, a compressor power supply circuit, and a control device for controlling the operation of the entire device, the control device, the liquid refrigerant amount detection when the compressor is stopped An air conditioner that controls the compressor power supply circuit so that a weak high-frequency open-phase current is passed through the motor of the compressor when the output signal of the means is continuously output for a predetermined time or longer. 2. A compressor temperature detecting means for outputting a signal when the temperature of the representative portion of the compressor becomes lower than a predetermined value is provided, and the control means has a liquid refrigerant amount detecting means when the compressor is stopped. 2. The air conditioner according to claim 1, wherein the compressor power supply circuit is controlled so that a weak high frequency open-phase current is caused to flow to the motor of the compressor when both the signal from the compressor and the signal from the compressor temperature detecting means are output. . 3. An outdoor temperature detecting means for outputting a signal when the outdoor air temperature falls below a predetermined value, and the control means detects the signal from the liquid refrigerant amount detecting means and the outdoor air temperature detection when the compressor is stopped. The air conditioner according to claim 1, wherein the compressor power supply circuit is controlled so that a weak high-frequency open-phase current is caused to flow to the motor of the compressor when the signal of the means is output together. 4. The control means controls the compressor power supply circuit such that energization of a weak high-frequency open-phase current flowing through the motor of the compressor is repeated for a predetermined time and for a predetermined time. The air conditioner according to claim 3.