JPS61161377A - Recovery device for lubricating oil of compression type refrigeration cycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lubricating oil recovery device for a compression refrigeration cycle.

Conventional technology As is well known, the compression type refrigeration cycle uses a gas phase refrigerant t condenser compressed by a compressor. The refrigerant is compressed to become a liquid phase refrigerant, and this liquid phase refrigerant is sent from the liquid tank to an expansion valve where it is adiabatically expanded and introduced into an evaporator, where it exchanges heat with the air blown into the vehicle and is then returned to the compressor. be. In such a compression type refrigeration cycle, the lubricating oil supplied to each driving part of the compressor during cycle operation mixes with the gas phase refrigerant and leaks into the refrigeration system. As shown in the New Automotive Engineering Handbook, Volume 7, page 123, published by Japan Society of Automotive Engineers, an oil separation device is installed at the refrigerant inlet of the compressor, and the lubricating oil that circulates through the refrigeration cycle and returns with the refrigerant is transferred to the refrigerant inlet. It is designed so that the oil is separated and collected in the compressor oil sump.

Problems that the invention aims to solve: When lubricating oil circulates within the refrigeration system, it adheres to various parts of the refrigeration system, resulting in poor recovery rates and increased lubricant consumption, which can lead to compressor seizure. Resulting in. Furthermore, especially when lubricating oil adheres to the inner surfaces of the condenser and evaporator, the heat exchange performance of these condensers and evaporators is significantly reduced, impairing the cooling effect.

Therefore, the present invention can recover the lubricating oil leaked from the compressor without circulating it into the refrigeration system, increasing the recovery rate, and avoiding the deterioration in heat exchange performance caused by the lubricating oil adhering to the inner surfaces of the condenser and evaporator. The present invention provides a lubricating oil recovery device for a compression type refrigeration cycle that can enhance the cooling effect.

Measures to solve the problem] An oil separation chamber is provided in the refrigerant passage that communicates with the compressor and the condenser, and the drain part of the kernel oil separation chamber is communicated with the low-pressure side refrigerant passage downstream of the evaporator through a drain pipe. .

The lubricating oil mixed in the gas phase refrigerant discharged from the working compressor is separated in an oil separation chamber, collected in a tray/section of the separation chamber, and is sequentially collected from this drain section into the compressor via a drain pipe. Ru.

Example 'Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a compression type refrigeration cycle, in which 1 is a compressor, 2 is a condenser, 3 is a liquid tank, 4 is an expansion valve, and 5 is an evaporator.

The gas phase refrigerant compressed by the compressor 1 reaches the condenser 2 via six refrigerant passages, is condensed in the condenser 2, becomes liquid phase refrigerant, and is sent to the liquid tank 3 via the refrigerant passage 6B. From liquid tank 3 to refrigerant passage 6
The liquid phase refrigerant discharged to C is adiabatically expanded by the expansion valve 4 and sent to the evaporator 5, where it exchanges heat with the indoor air, and is returned to the compressor IK via the refrigerant passage 6D, where it enters the refrigeration cycle. Configure.

Here, an oil separation chamber 7 is provided in the refrigerant passage 6A that communicates the compressor 1 and the condenser 2, and a drain pipe connects the drain part 8 of the oil separation device 7 and the low pressure side refrigerant passage 6D downstream of the evaporator 5. 9 is continuous. In this embodiment, the oil separation chamber 7 is a refrigerant passage 6A for eliminating pulsation noise of the gas phase refrigerant discharged from the compressor 1.
The muffler 9, which has a relatively large volume, is effectively utilized. The refrigerant passage end 6a on the artificial side of the oil separation chamber 7 is the second
As shown in the figure, the gas phase refrigerant discharged from the compressor 1 is projected into the separation chamber 7 and bent upward, and its open end is disposed close to the inner surface of the upper wall of the separation chamber 7.
By spraying the lubricating oil onto the inner surface of the upper wall, the lubricating oil mixed in the gas phase refrigerant can be easily separated.

According to the structure of the above embodiment, the gas phase refrigerant compressed by the compressor 1 and flowing into the oil separation chamber 7 is blown onto the inner surface of the earthen wall of the oil separation chamber 7 from the refrigerant passage end 6a. At this time, the lubricating oil leaked from the compressor and mixed into the gas phase refrigerant adheres to the inner surface of the earthen wall of the oil separation chamber 7, is separated from the gas phase refrigerant, and is collected in the drain section 8 along the indoor wall surface. It will be done.

The lubricating oil collected in this drain section 8 is sequentially recovered to the compressor 1 via the drain pipe 9, and thus,
Circulation of lubricating oil within the refrigeration system can be suppressed.

In the actual example shown in Fig. 3, there is a float valve 10 in the drain section 8A.
is arranged. Drain part 8 at the bottom of oil separation chamber 7
A is recessed, and a float valve 10 is arranged in this recessed drain portion 8A.

The float valve 10 consists of a casing 11 with a through hole 12 formed on the circumferential side and a float 13 accommodated in the core casing 11. The valve port 14 is closed to prevent the gas phase refrigerant in the oil separation chamber 7 from returning to the compressor 1 side via the drain pipe 9. When lubricating oil accumulates in the drain 558A, the float 13 floats up and closes the valve. Open the port 14 and let the lubricating oil collect in the drain part 8A through the hole 12. Valve port 1
4'IL and sequentially lead out to the drain pipe 9.

In the embodiment described above, the muffler for muffling refrigerant pulsation is effectively used as an oil separation chamber, but it goes without saying that an oil separation chamber may be provided separately from the muffler for muffling.

Effects of the Invention As described above, according to the present invention, the lubricating oil that mixes into the gas phase refrigerant compressed by the compressor and leaks from the compressor is removed in the oil separation chamber provided in the refrigerant passage immediately after being discharged from the compressor. Since it is separated and recovered by the compressor via the drain pipe, the circulation of lubricating oil within the refrigeration system is suppressed, greatly improving the lubricating oil recovery rate and preventing compressor seizure. . Further, since the circulation of lubricating oil within the refrigeration system can be suppressed, the lubricating oil will not adhere to the inner surface of the condenser or the evaporator and reduce the heat exchange performance thereof, so that the cooling effect can be enhanced. Furthermore, the gas phase refrigerant discharged from the compressor inevitably causes pulsation, but as this gas phase refrigerant flows into the oil taX and is diffused, the pulsation is canceled out, thereby preventing pulsation noise. It has a great practical effect in that it can also be used.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing a refrigeration cycle employing an embodiment of the present invention, Fig. 2 is a sectional view showing the structure of an oil separation chamber, and Fig. 3 is a sectional view showing the structure of an oil separation chamber.
The figure is a sectional view showing a different example. '1...Compressor, 2...Conditioner/su, 3...
Liquid tank, 4... Expansion valve, 5... Evaporator, 6A, 6D... Refrigerant passage, 7... Oil separation chamber, 8, 8
People...Drain section, 9...Drain pipe. Figure 1 Figure 2

Claims (1)

[Claims] (1) Lubricating oil for a compression type refrigeration cycle in which an oil separation chamber is provided in the refrigerant passage that communicates the compressor and the condenser, and the drain part of the oil separation chamber and the low-pressure side refrigerant passage downstream of the evaporator are connected through a drain pipe. Collection device.