JPS6018774Y2 - Oil recovery device for turbo chiller - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil recovery device for a centrifugal chiller.

An example of the conventional one is shown in Fig. 1, where 1 is an evaporator;
2 is a condenser, 3 is a compressor, 4 is a partition between the evaporator and the condenser,
5 is an ejector, 6, 7.8 are connecting pipes, and 9 is a suction vane.

Conventionally, in a turbo chiller configured in this way, the evaporator 1
The refrigerant boils, becomes droplets, and flies out of the gas-liquid interface, collides with the partition wall 4 and adheres thereto, and is swept upward by the upward vapor flow within the evaporator 1.

Since the temperature of the partition wall 4 increases due to heat transfer from the condenser 2, the adhering refrigerant evaporates and by the time it reaches the top of the partition wall 4, most of the refrigerant contained in the refrigerant becomes oil. .

The oil that has reached the upper end of the partition wall 4 is blown away by the airflow, becomes droplets, and is sucked into the suction port of the compressor 3.

Some of the sucked droplet-shaped oil collides with and adheres to the suction vane 9, etc., accumulates at the bottom of the vane, is sucked by the ejector 5 driven by the discharge gas of the compressor 3, and is returned to the lubricating oil system. , other oil droplets that ride on the airflow without colliding are discharged from the compressor 3 to the condenser 2 and are dissolved in the refrigerant again, and the lubricating oil is constantly circulated in the refrigerator along with the refrigerant. , the oil concentration in the refrigerant increases until it is in equilibrium with the amount recovered.

As described above, in the conventional oil recovery apparatus, the concentration of oil components in the refrigerant becomes high, so that it adheres to the surface of the heat transfer tube of the evaporator 1 and inhibits heat transfer, resulting in a reduction in the performance of the refrigerator.

SUMMARY OF THE INVENTION An object of the present invention is to provide an oil recovery device for a centrifugal chiller that eliminates the above-mentioned drawbacks of the conventional device, improves the oil recovery rate, and makes it possible to improve performance.

The present invention provides an oil recovery device for a centrifugal chiller that includes a compressor, an evaporator and a condenser formed in a single can body separated by a partition wall, and a lubrication system that lubricates the compressor. An oil-absorbing body made of an oil-containing porous material is provided on the side of the partition wall that is in contact with the evaporated gas phase, and a recovery mechanism is provided for recovering the lubricating oil collected by the oil-absorbing body. This is an oil recovery device for centrifugal chillers.

To explain the present invention with reference to the drawings, in FIGS. 2, 3, and 4, an oil absorbing body 1
2 is provided.

The oil absorbing body 12 is made of an oil-impregnating porous material, such as a sponge, sintered alloy, metal wool, wire mesh, etc., that is porous and has oil-impregnating properties, and has the property of absorbing oil that comes into contact with it and causing it to seep into the interior. ing.

10 is a cover, and 11 is an oil return pipe.

With this configuration, the refrigerant adhering to the partition wall 4 rises due to the airflow and is heated by heat transfer from the condenser through the partition wall, and when it becomes almost only oil, it is adsorbed by the oil absorbing body 12. .

The adsorbed oil is transmitted through the oil absorbing body 12 due to surface tension, and when the content increases, it drips from the falling portion 13 of the oil absorbing body 12 due to gravity and accumulates in the saucer 14 as shown in FIG.

The oil accumulated in the saucer 14 is sucked through the pipe 15 by the ejector 5 driven by the discharge gas of the compressor 3.
The oil is returned to the lubricating oil system through an oil return pipe 11.

A cover 10 may be provided over the oil drip opening to prevent refrigerant from adhering, and the drip opening may not be located at the end of the can body, as shown in FIG.

Also, a pump may be used instead of the ejector 5.

By adopting such a structure, oil adhering to the partition wall 4 can be collected without being scattered again.
The recovery rate of the oil dissolved in the refrigerant is improved, thereby making it possible to lower the oil concentration in the refrigerant, which no longer impedes the heat transfer performance of the evaporator 1, thereby improving the performance of the refrigerator. .

With this invention, not only when oil and refrigerant are mixed, but also when they are dissolved, the refrigerant can concentrate and separate the evaporated oil by heating the droplets, thereby improving heat transfer in the evaporator. Since the concentration of oil components in the refrigerant that inhibits the refrigerant is reduced, the heat transfer performance of the evaporator is improved, and the required compression power of the refrigerator is reduced, which improves the performance of the refrigerator, and the amount of lubricating oil required for the refrigerator is reduced. The oil recovery device for the centrifugal chiller has excellent advantages such as reducing the heat transfer performance of the chiller, reducing the required heat transfer area, and making the chiller smaller. It is possible to provide this method and has an extremely large practical effect.

[Brief explanation of drawings]

Fig. 1 is a flowchart of the conventional example, Fig. 2 is a flowchart of the embodiment of the present invention, Fig. 3 is a sectional view taken along line A-A, and Fig. 4 is a flowchart of the embodiment of the present invention.
It is a sectional view taken along the line BB in the figure. 1...Evaporator, 2...Condenser, 3...
... Compressor, 4 ... Bulkhead, 5 ...
Ejector, 6. 7. 8...Piping, 9...
...Suction vane, 10...Cover, 1
1... Oil return piping, 12... Oil absorbing body,
13...Falling portion, 14...Saucer, 15...Piping.

Claims (1)

[Claims for Utility Model Registration] ■ A turbo refrigeration system comprising a compressor, an evaporator and a condenser formed in a single can body separated by a partition, and a lubrication system for lubricating the compressor. The oil recovery device for a machine includes an oil absorbing body made of an oil-containing porous material provided on a side of the partition wall that is in contact with the gas phase of the evaporator, and a recovery mechanism for recovering lubricating oil collected by the oil absorbing body. An oil recovery device for a centrifugal chiller characterized by: 2. The apparatus according to claim 1, wherein a part of the oil absorbing body has a falling part, and an oil receiving tray is provided below the falling part to collect the oil.