JPH05203268A - Starting method of compression type refrigerator - Google Patents

Abstract

PURPOSE:To minimize the number of reverse rotational operations by a method wherein a compression type refrigerator is started by reverse rotation in normal operation at the time of the initial stage of starting when the state of compression stoppage continues for a fixed time or more when the refrigerator is started, stopped after operation for a specified time and started by forward rotation and normal operation is conducted. CONSTITUTION:In a device, in which a compressor section composed of a turning scroll 2 and a fixed scroll 3 is housed into a sealed vessel 1 and the compressor section is driven by a motor 4 controlled by a controller 6 through a power circuit 5, a time T is measured during a time when a compressor is stopped when the motor 4 is stopped. When the compressor is started, whether or not a motor stop time T exceeds a preset time T1 is decided. When T>T1 holds at that time, the motor 4 is started by reverse rotation by the controller 6, the turning scroll 2 is turned in the opposite direction to normal operation, a refrigerant gas from a blow-off duct 8 is discharged from a suction duct 7, a liquid refrigerator sucked into the suction duct 7 is extruded, and the motor 14 is stopped, and forward rotated and started again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for starting a compression type refrigeration system.

[0002]

2. Description of the Related Art Conventionally, when a refrigerating device such as an air conditioner is stopped for a long time, liquid refrigerant stagnation occurs in a compressor suction line when the compressor is kept at a low temperature, and when the compressor is started, Liquid compression may occur, resulting in excessive shaft torque, or even damage to the compressor.

In order to prevent the shaft torque from being excessive and the compressor from being damaged, the compressor power circuit of the refrigerating apparatus is started in reverse rotation only at the first start after the switch is turned on, and gas is sucked from the discharge port and sucked. The liquid refrigerant discharged from the port and sunk into the suction pipe was pushed back, stopped, and then started to rotate forward again to mainly suck gas, thereby preventing liquid compression.

Further, ON-O according to a control command of the refrigeration system
In the start-up during the FF operation, the start-up is immediately started in the normal rotation to reduce the number of reverse rotation operations so as not to impair the original capacity of the compression refrigeration system. A method of starting such a compression type refrigeration system is known, for example, from Japanese Patent Laid-Open No. 61-213556.

[0005]

However, in the above-mentioned configuration, in the case of an air conditioner, for example, the compressor is controlled in a low temperature outside air for a long time depending on the heat load in the room being controlled and the air conditioning setting of the user. It may be stopped by a command. In this case, there is a problem in that there is a high possibility that liquid compression of the compressor will occur and the compressor will be damaged.

In view of the above problems, the present invention reliably prevents liquid compression of the compressor while minimizing the number of reverse rotation operations so as not to impair the original capacity of the compression refrigeration system.

[0007]

In order to solve the above problems, a method for starting a compression refrigerating apparatus according to the present invention uses a positive displacement compressor in which the flow of gas is reversed by reversing the rotation of a drive shaft. In the conventional compression refrigeration system, when the control power source of the compressor is controlled by the control device and the compressor is kept stopped for a certain period of time, it is started in reverse rotation from the normal state at the beginning of startup It is configured to stop after the operation for a certain time, then to start the normal rotation to start the normal operation, and to start immediately to the normal rotation in other cases.

The method for starting a compression refrigeration system of the present invention is a compression type refrigeration system using a positive displacement compressor in which the flow of gas is reversed by reversing the rotation of the drive shaft. When controlling the power source and detecting the temperature of a typical part of the compressor and the suction pipe by the temperature detecting means, and when the temperature is lower than a certain temperature and continues for a certain time or longer in a state where the compressor is stopped, , It is configured to start in the reverse rotation from the normal at the beginning of the start, stop after a predetermined time of operation, then start in the normal rotation to enter the normal operation, and in other cases immediately start in the normal rotation. It is a thing.

The method for starting a compression refrigeration system of the present invention is a compression refrigeration system using a positive displacement compressor in which the flow of gas is reversed by reversing the rotation of the drive shaft. While controlling the power supply, the ambient temperature of the device equipped with the compressor is detected by the temperature detecting means, and when the temperature is lower than the constant temperature and continues for a certain time or longer when the compressor is stopped, At the beginning of startup, it is configured to start in reverse rotation from normal, stop after a predetermined time of operation, then start in normal rotation to enter normal operation, and in other cases immediately start in normal rotation Is.

The method for starting a compression refrigeration system of the present invention is a compression type refrigeration system using a positive displacement compressor in which the flow of gas is reversed by reversing the rotation of the drive shaft. While controlling the power supply, the amount of liquid refrigerant in the compressor is detected by the liquid refrigerant detection means provided inside the compressor, and when the amount of liquid refrigerant is a certain amount or more in the state where the compressor is stopped, start At the initial stage, it is configured to start in reverse rotation from normal, stop after a predetermined time of operation, then start in normal rotation to enter normal operation, and immediately start in normal rotation in other cases. is there.

The method for starting a compression refrigeration system of the present invention is a compression refrigeration system using a positive displacement compressor in which the flow of gas is reversed by reversing the rotation of the drive shaft. While controlling the power source, the current value of the electric power supplied from the driving power source to the compressor is detected by the current detecting means, and if the current value at the initial stage of starting the compressor exceeds a certain level, the compressor is turned off. It is configured to stop and start in reverse rotation from normal, stop after a predetermined time of operation, then start in normal rotation to enter normal operation, and in other cases immediately start in normal rotation Is.

[0012]

With the above-described first configuration, the time during which the compressor is stopped is measured by the control device of the refrigeration system. The control device determines whether the time the compressor has been stopped is equal to or longer than a preset time when the compressor is to be started. If it is determined that the compressor has been stopped for more than the preset time, the control device starts the compressor in reverse rotation, sucks gas from the discharge port and discharges it from the suction port, Push back the liquid refrigerant that has laid down in the suction line. After that, the control device restarts the normal rotation again after stopping the compressor. In cases other than the above, start up the compressor immediately after normal rotation.

With the above-mentioned second structure, the control device is
When trying to start the compressor, it is determined whether or not the temperature of the representative part of the compressor is equal to or lower than a preset temperature for a preset time or longer. When it is judged that the temperature of the representative part of the compressor is below the preset temperature for more than the set time, the control device starts the compressor in reverse rotation and sucks gas from the discharge port. The liquid refrigerant discharged from the suction port and lying in the suction pipe is pushed back. After that, the control device restarts the normal rotation again after stopping the compressor. In cases other than the above, start up the compressor immediately after normal rotation.

With the above-mentioned third structure, the control device is
When trying to start the compressor, it is determined whether or not the ambient temperature of the device in which the compressor is mounted is lower than or equal to a preset temperature for a set time or longer. If the controller determines that the ambient temperature of the equipment installed with the compressor is below the preset temperature for more than the set time, the control device starts the compressor in reverse rotation and The gas is sucked in and discharged from the suction port, and the liquid refrigerant laid in the suction pipe is pushed back. After that, the control device restarts the normal rotation again after stopping the compressor. In cases other than the above, start up the compressor immediately after normal rotation.

With the above-mentioned fourth structure, the control device is
When attempting to start the compressor, it is determined whether or not the liquid refrigerant detection means provided inside the compressor or the suction pipe line has detected the liquid refrigerant. When it is determined that the liquid refrigerant has been detected, the control device starts the compressor in the reverse rotation, sucks the gas from the discharge port and discharges the gas from the suction port, and pushes back the liquid refrigerant laid in the suction pipeline. After that, the control device restarts the normal rotation again after stopping the compressor. In cases other than the above, start up the compressor immediately after normal rotation.

With the above-mentioned fifth configuration, the control device is
Immediately after starting the compressor in forward rotation, determine whether the compressor starting current is above a certain level. When it is determined that the compressor start-up current is above a certain level, the control device immediately stops the compressor and then starts it in reverse rotation, sucks gas from the discharge port and discharges it from the suction port, and lays it down in the suction pipe line. Push back the saliva refrigerant. After that, the control device restarts the normal rotation again after stopping the compressor. In cases other than the above, start up the compressor immediately after normal rotation.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, an orbiting scroll 2 and a fixed scroll 3 are arranged inside a compressor hermetic container 1,
A motor 4 is connected to the orbiting scroll 2. A compressor power circuit 5 is connected to the motor 4,
A controller 6 is connected to the compressor power supply circuit 5. Further, a suction pipe line 7 and a discharge pipe line 8 communicate with the compressor airtight container 1, and the flow of the refrigerant gas is reversed by reversing the rotation of the drive shaft of the motor 4.

The control operation in the above configuration will be described. When the motor 4 is stopped, the control device 6 starts measuring the time T while the compressor is stopped. Then, the control device 6 determines whether the time T during which the motor 4 is stopped when the compressor is to be started is equal to or longer than the preset time T ₁ .

When it is determined that the time T during which the motor 4 is stopped is longer than the preset time T ₁ , the control device 6 starts the motor 4 in the reverse rotation and turns the fixed scroll 3 against the fixed scroll 3. The scroll 2 is rotated in the normal reverse direction, the refrigerant gas is sucked in from the discharge pipe line 8 and discharged from the suction pipe line 7, and the liquid refrigerant lying in the suction pipe line 7 is pushed back. After that, the control device 8 once stops the motor 4 and then starts the normal rotation again.

In cases other than the above, for example, the motor 4 is started immediately after normal rotation by turning on / off the compressor in a short time. As is clear from the above operation, the stagnation of the refrigerant is detected by constantly detecting the stop time of the motor 4, and the number of times of reverse rotation operation is made the necessary minimum so as not to impair the original capacity of the compression type refrigeration apparatus, Liquid compression can be reliably prevented at a relatively low cost.

FIG. 2 shows another embodiment of the present invention. Members having the same functions as those of the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. In FIG. 2, a temperature sensor 11 serving as a temperature detecting means is provided in the suction pipe line 7. The position at which the temperature sensor 11 is provided may be a typical part of the compressor.

The control operation in the above configuration will be described. When the motor 4 stops, the control device 6 starts measuring the time T ₂ during which the temperature H detected by the temperature sensor 11 remains below the preset temperature H ₁ .

Then, the control device 6 judges whether or not the measured time T ₂ has continued for a preset time T ₃ or more when the motor 4 is started. At this time, and when it is determined that the temperature H of the temperature sensor 11 is equal to or lower than the preset temperature H ₁ for the set time T ₃ or longer, the control device 6 starts the motor 4 by reverse rotation. Then, the refrigerant gas is sucked from the discharge pipe line 8 and discharged from the suction pipe line 7, and the liquid refrigerant lying in the suction pipe line 7 is pushed back.

After that, the control device 6 restarts the normal rotation again after stopping the motor 4. In the cases other than the above, the motor 4 is immediately started by forward rotation. As is clear from the above operation, when the compressor is stopped, the suction pipe line 7
By detecting the time when the temperature was below the set temperature, the stagnation of the refrigerant is detected, and the number of times of reverse rotation operation is minimized so as not to impair the original capacity of the compression type refrigeration system while ensuring liquid compression. Can be prevented.

FIG. 3 shows another embodiment of the present invention. Members having the same functions as those of the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. In FIG. 3, a temperature sensor 13 is provided on the outer case 12 of the device equipped with the compressor as a temperature detecting means for detecting the ambient temperature of the outer case 12.

The control operation in the above configuration will be described. When the motor 4 is stopped, the control device 6 starts measuring the time T _{4 during} which the ambient temperature H ₂ of the outer case 12 detected by the temperature sensor 13 remains below the preset temperature H ₃ .

Then, the control device 6 activates the motor 4.
When I try to_FourSettings preset by
Time T_Five Judge whether the above has been continued. At this time,
The control device 6 controls the temperature H detected by the temperature sensor 13.₂ But
Preset temperature H ₃ When the following states are set
Interval T_Five When it is determined that the above has continued, the control device 6
Start the motor 4 by reverse rotation and suck gas from the discharge pipe line 5.
Liquid discharged from the intake suction line 4 and lying on the suction line
Push back the refrigerant.

After that, the control unit 6 restarts the normal rotation again after stopping the motor 4. In the cases other than the above, the motor 4 is immediately started by forward rotation. As is clear from the above operation, the stagnation of the refrigerant is detected by detecting the time T ₅ when the ambient temperature of the outer box 12 when the compressor is stopped is below the set temperature H ₃ and the reverse rotation operation is performed. It is possible to surely prevent the liquid compression while minimizing the number of times so as not to impair the original ability of the compression type refrigerating apparatus.

FIG. 4 shows another embodiment of the present invention. Members having the same functions as those of the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. In FIG. 4, a float switch 14 is provided inside the suction pipe line 4 as a liquid refrigerant detecting means for detecting the liquid refrigerant surface.

The control operation in the above configuration will be described. When attempting to start the motor 4, the control device 6 determines whether or not the float switch 14 provided in the suction conduit 4 detects the liquid refrigerant surface.

The control device 6 is the float switch 1
When it is determined that 4 is detecting the liquid refrigerant surface, the control device 6 starts the motor 4 by reverse rotation, sucks the refrigerant gas from the discharge pipe line 8 and discharges it from the suction pipe line 7, and sucks it. The liquid refrigerant lying in the pipeline 7 is pushed back.

After that, the control unit 6 restarts the normal rotation again after stopping the motor 4. In the cases other than the above, the motor 4 is immediately started by forward rotation. As is clear from the above operation, the float switch 1 provided in the suction pipe line 7
By directly detecting the stagnation of the refrigerant by means of 4, it is possible to reliably prevent the liquid compression while minimizing the number of reverse rotation operations so as not to impair the original capacity of the compression type refrigeration system.

FIG. 5 shows another embodiment of the present invention. Members having the same functions as those of the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. In FIG. 5, the motor 4
An ammeter 15 is interposed between the compressor power supply circuit 5 and the compressor power supply circuit 5 as current detection means for detecting the current value of the electric power supplied to the motor 4.

The control operation in the above configuration will be described. The control device 6 determines whether or not the compressor starting current I immediately after the motor 4 is started in the normal rotation is equal to or higher than a constant level I ₁ .

The compressor starting current I is kept at a constant level I.
When it is determined that the value is ₁ or more, the control device 6 immediately stops the motor 4 and then starts the motor in reverse rotation, sucks gas from the discharge pipe line 8 and discharges it from the suction pipe line 7,
Push back the liquid refrigerant that has laid down in. After that, the control device 6 restarts the normal rotation again after stopping the motor 4. In the cases other than the above, the motor 4 is immediately started by forward rotation.

As is apparent from the above operation, paying attention to the fact that the compressor current increases when the liquid is compressed, the current value of the motor 4 at the time of starting the normal rotation is detected to detect the stagnation, so that the reverse rotation operation is performed. It is possible to surely prevent the liquid compression while minimizing the number of times so as not to impair the original ability of the compression type refrigerating apparatus.

[0037]

As described above, according to the present invention, the stagnation of the refrigerant can be detected by always detecting the stop time of the compressor, or the suction pipe line while the compressor is stopped can be detected. By detecting the time that was below the set temperature, it is possible to detect the stagnation of the refrigerant, or by detecting the time when the ambient temperature of the outer box while the compressor is stopped is below the set temperature, It is possible to detect the stagnation of the refrigerant, or it is possible to directly detect the stagnation of the refrigerant by the liquid refrigerant surface detection means provided in the suction pipeline.
Alternatively, paying attention to the fact that the compressor current increases during liquid compression, it is possible to detect the stagnation by detecting the compressor current at the time of normal rotation start, and to minimize the number of reverse rotation operations to the minimum necessary, and the compression type refrigeration system. It is possible to reliably prevent liquid compression at a relatively low cost while not impairing the original ability.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a compression refrigerator according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a compression refrigerator according to another embodiment of the present invention.

FIG. 3 is an overall configuration diagram of a compression refrigerator according to still another embodiment of the present invention.

FIG. 4 is an overall configuration diagram of a compression refrigerator according to still another embodiment of the present invention.

FIG. 5 is an overall configuration diagram of a compression refrigerator according to still another embodiment of the present invention.

[Explanation of symbols]

 1 Compressor Airtight Container 2 Orbiting Scroll 3 Fixed Scroll 4 Motor 5 Compressor Power Supply Circuit 6 Controller 7 Suction Pipeline 8 Discharge Pipeline

Claims (5)

[Claims] 1. In a compression type refrigerating apparatus using a positive displacement compressor in which the flow of gas is reversed by reversing the rotation of a drive shaft, a controller controls a drive power source of the compressor,
If the compressor is stopped for a certain period of time or longer, it will start in the reverse rotation at the beginning of startup and will stop after a predetermined time of operation, and then will start in normal rotation to start normal operation. A method for starting a compression type refrigerating device, characterized in that the compression type refrigerating device is started immediately after being turned on. 2. In a compression type refrigerating apparatus using a positive displacement compressor in which the flow of gas is reversed by reversing the rotation of a drive shaft, a controller controls the drive power source of the compressor, and the compressor and the suction When the temperature of a typical part in the pipeline is detected by the temperature detecting means and the temperature is lower than a certain temperature and continues for a certain period of time when the compressor is stopped, it is rotated reversely from the normal state at the initial startup. A method for starting a compression refrigerating device, which is started and stopped after a predetermined time of operation, then started in normal rotation to start normal operation, and in other cases immediately starts in normal rotation. 3. A compression type refrigerating apparatus using a positive displacement compressor in which the flow of gas is reversed by reversing the rotation of a drive shaft, the control device controls a drive power source of the compressor, and the compressor is mounted. The ambient temperature of the operating device is detected by the temperature detecting means, and when the compressor is stopped and the temperature is lower than a certain temperature and continues for a certain period of time or more, it is started in reverse rotation from the normal state at the initial start-up. The method for starting a compression refrigerating device is characterized by stopping after a predetermined time of operation, then starting at normal rotation to start normal operation, and immediately starting at normal rotation otherwise. 4. In a compression type refrigerating apparatus using a positive displacement compressor in which the flow of gas is reversed by reversing the rotation of a drive shaft, a controller controls a drive power source of the compressor, and the inside of the compressor is controlled. The amount of liquid refrigerant in the compressor is detected by the liquid refrigerant detection means provided in, and when the amount of the liquid refrigerant is a certain amount or more in the state where the compressor is stopped, it is started in the reverse rotation from the normal at the initial start-up. After a predetermined time of operation, it will stop and then start with normal rotation to start normal operation,
In other cases, the method for starting a compression type refrigerating apparatus is characterized in that it is immediately started in normal rotation. 5. In a compression type refrigerating apparatus using a positive displacement compressor in which the flow of gas is reversed by reversing the rotation of the drive shaft, the control unit controls the drive power source of the compressor and the compression is performed from the drive power source. The current value of the electric power supplied to the compressor is detected by the current detection means, and if the current value at the initial stage of starting the compressor exceeds a certain level, the compressor is stopped and the compressor is started in reverse rotation from the normal state. Then, after running for a predetermined time, it will stop, and then it will start at normal rotation to enter normal operation,
In other cases, the method for starting a compression type refrigerating apparatus is characterized in that it is immediately started in normal rotation.