JPH0155397B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an automatic extraction device for non-condensable gas in a refrigerator.

[Prior art]

Generally, non-condensable gas in the refrigeration cycle accumulates in the condenser when the refrigerator is operated. The non-condensable gas accumulated in the condenser increases the compression ratio during operation of the refrigerator, resulting in wasted power consumption.
In addition, if non-condensable gas remains inside the refrigerator for a long period of time, it may cause rust inside the refrigerator.
The life of the refrigerator will be shortened.

By the way, conventional non-condensable gas bleed equipment connects a condenser to a bleed gas recovery device via bleed piping, cools the gas accumulated in the bleed gas recovery device, separates it into refrigerant and non-condensable gas, and connects the condenser to the bleed gas recovery device. The pressure difference between the internal pressure and the atmospheric pressure was used to release non-condensable gas to the atmosphere. Therefore, in the extraction device, when the pressure in the condenser drops to about atmospheric pressure or below atmospheric pressure,
The drawback was that non-condensable gas could not be released into the atmosphere.

In addition, other conventional air bleed devices store oil in a bleed air recovery device, and when this oil is returned to the oil tank, the pressure in the bleed air recovery device decreases, creating a pressure difference between the pressure in the condenser and the pressure in the condenser. Taking advantage of this, the refrigerant gas + non-condensable gas in the condenser is guided to the bleed air recovery device, and after a certain amount has accumulated, the refrigerant gas is dissolved in the cooled oil while supplying oil to the bleed air recovery device, and the non-condensable gas is It was pressurized with oil and released into the atmosphere. However, with this bleed system, when the pressure in the condenser decreases, the differential pressure between the condenser and the bleed gas recovery device decreases, and the amount of gas accumulated in the bleed gas recovery device also decreases, potentially significantly reducing the bleed performance. .

[Purpose of the invention]

An object of the present invention is to be able to reliably recover non-condensable gas even when the pressure inside the condenser drops to approximately atmospheric pressure or below atmospheric pressure, and to automatically and reliably transfer the recovered non-condensable gas to atmospheric pressure. An object of the present invention is to provide an automatic extraction device for non-condensable gas of a refrigerator which can be discharged to a refrigerator.

[Summary of the invention]

The present invention connects an oil pipe branched from a compressor oil supply pipe to an bleed air recovery device having a cooling pipe passed inside thereof, connects the bleed air recovery device and a compressor oil tank with an oil return pipe, and connects a bench lily to the oil pipe. , the bench lily and the condenser are connected by an air bleed pipe, an oil level detector and a non-condensable gas discharge pipe are attached to the said bleed air collector, and the non-condensable gas discharge pipe is connected to the oil level in the bleed air collector. The device is characterized in that it is provided with a valve that opens when the value is below a certain value, and with this configuration, the above object can be reliably achieved.

[Embodiments of the invention]

The present invention will be explained below.

The drawing shows an embodiment of an automatic extraction device for non-condensable gas according to the present invention, which includes a compressor 1, a compressor oil tank 2 attached thereto, a condenser 7, and an extraction recovery device 11. .

The compressor oil tank 2 is equipped with an oil pump 3, and oil discharged from the oil pump 3 is supplied to the bearing portion of the compressor 1 through a compressor oil supply pipe 4.

An oil pipe 5 is branched from the compressor oil supply pipe 4, and the oil pipe 5 is connected to a bleed air recovery device 11. In addition, a bench lily 6 is provided in the middle of the oil pipe 5.
is provided.

The condenser 7 is provided with an air bleed pipe 8, and the air bleed pipe 8 is connected to a portion that becomes negative pressure when the bench lily 6 is operated. Further, the bleed pipe 8 is provided with a strainer 9 and a check valve 10.

The bleed gas recovery device 11 is provided with a cooling pipe 12, an oil return pipe 13, two level switches 17 and 18 as oil level detectors, a non-condensable gas discharge pipe 19, and a pressure switch 22. The cooling pipe 12 is inserted into the bleed air recovery device 11 . The oil return pipe 13 is connected to the compressor oil tank 2
The oil return pipe 13 is also provided with a dryer 14 for removing water dissolved in the oil, a check valve 15, and a solenoid valve 16 that opens simultaneously with the operation of the oil pump 3. The level switches 17 and 18 are provided to detect the lower limit position and upper limit position of the oil level in the bleed air recovery device 11. The non-condensable gas discharge pipe 19 includes a solenoid valve 2.
0 and a check valve 21 are provided. The electromagnetic valve 20 is electrically connected to open in response to a signal from a level switch 17 that detects the lower limit position of the oil level, and closes in response to a signal from a level switch 18 that detects the upper limit position of the oil level. There is. The pressure switch 22 is adapted to detect the pressure within the bleed air recovery device 11.

The automatic extraction device for non-condensable gas according to the above embodiment operates as follows.

That is, when the oil pump 3 is operated, a part of the oil discharged from the compressor oil tank 2 to the compressor oil supply pipe 4 is branched to the oil pipe 5, and the oil is transferred to the bench lily 6 provided in the oil pipe 5. through which it flows to the bleed air collector 11.

When the oil passes through the bench lily 6, the part of the bench lily 6 to which the bleed pipe 8 is connected becomes negative pressure due to the bench lily effect. As a result, refrigerant gas + non-condensable gas is sucked up from the condenser 7 into the bleed pipe 8, and these gases enter the bench 6 through the strainer 9 and check valve 10 provided in the bleed pipe 8, and then into the oil pipe 5. It is led to the bleed air collector 11 through. Therefore, condenser 7
Even if the internal pressure drops to about atmospheric pressure or below atmospheric pressure, the non-condensable gas can be reliably fed to the extraction gas recovery device 11.

The oil entering the bleed air recovery device 11 from the oil pipe 5 is cooled by cold water flowing through the cooling pipe 12. On the other hand, the refrigerant gas + non-condensable gas led from the oil pipe 5 to the bleed gas recovery device 11 is separated into the refrigerant gas cooled by the oil and the non-condensable gas, the refrigerant gas dissolves in the oil and the non-condensable gas Bleed air collector 11
It is stored in the upper part of the inside.

Non-condensable gas accumulates in the bleed gas recovery device 11,
As the amount increases, the amount of oil decreases and the oil level drops. When the oil level falls below a certain value, the solenoid valve 20 provided in the non-condensable gas discharge pipe 19 is opened in response to a signal from the level switch 17, and the non-condensable gas in the bleed air recovery device 11 is discharged through the solenoid valve 20 and the check valve. It is discharged to the atmosphere through valve 21. Therefore, the non-condensable gas can be reliably separated in the bleed gas recovery device 11, and the non-condensable gas can be automatically and reliably released to the atmosphere.

As the non-condensable gas is released into the atmosphere, the oil level in the bleed gas recovery device 11 rises, and when it reaches a certain value, the solenoid valve 20 is closed by a signal from the level switch 18.

During this time, simultaneously with the operation of the oil pump 3, the solenoid valve 16 provided in the oil return pipe 13 is opened. As a result, the oil in the bleed air recovery device 11 is returned to the compressor oil tank 2 through the dryer 14, check valve 15, and solenoid valve 16 provided in the oil return pipe 13. In this embodiment, water contained in the oil is removed by the dryer 14.

〔Effect of the invention〕

According to the present invention as described above, a part of the oil flowing into the compressor through the compressor oil supply pipe is branched to the oil pipe, and this oil is allowed to flow through the bench lily provided in the oil pipe, whereby negative pressure is created by the vent lily effect. In the tired part,
Since the system is designed to draw up air from the condenser through the bleed air piping and send it to the bleed air recovery unit through the bench lily, even if the pressure inside the condenser drops to around or below atmospheric pressure, non-condensable gas can be reliably delivered to the bleed air recovery unit. In addition, when non-condensable gas accumulates in the bleed air recovery device and the oil level in the bleed air recovery device falls below a certain value due to the increase in non-condensed gas, the non-condensable The valve installed in the gas release pipe is opened to release the non-condensable gas in the bleed air recovery device to the atmosphere, which has the effect of automatically and reliably releasing the recovered non-condensable gas to the atmosphere. .

[Brief explanation of drawings]

The accompanying drawing is a system diagram showing one embodiment of the automatic air extraction device of the present invention. 1... Compressor, 2... Compressor oil tank, 3...
Oil pump, 4...Compressor oil supply pipe, 5...Oil pipe, 6...Bench lily, 7...Condenser, 8...Bleed air pipe, 11...Bleed air recovery device, 12...Cooling pipe, 13... Oil return piping, 17, 18... Level switch as an oil level detector, 19... Non-condensable gas discharge piping, 20... Solenoid valve as a valve provided in the non-condensable gas discharge piping.

Claims (1)

[Claims] 1 Connect an oil pipe branched from the compressor oil supply pipe to the bleed air recovery device that has a cooling pipe passed inside it, connect the bleed air recovery device and the compressor oil tank with an oil return pipe, and provide a bench lily on the oil pipe. , the bench lily and the condenser are connected by an air bleed pipe, an oil level detector and a non-condensable gas discharge pipe are attached to the said bleed air collector, and the oil level in the bleed air collector is maintained at a constant level in the non-condensable gas discharge pipe. An automatic extraction device for non-condensable gas in a refrigerator, characterized in that it is equipped with a valve that opens below a certain value.