JPH0428962A - Oil purifying device for freezer device - Google Patents

Abstract

PURPOSE:To enable oil of about 100% to be continuously purified and to eliminate a phenomenon for foaming refrigerant in a refrigerant heater when a freezer device is energized by a method wherein an oil purifying device is provided with an oil surface adjuster installed in a refrigerant heater and for adjusting an amount of oil stored at a bottom surface of the refrigerant heater and a solenoid valve connected between an evaporator and the refrigerant heater and controlled to be opened or closed by an oil surface adjusting device. CONSTITUTION:Refrigerant containing oil is fed from an evaporator 4 into an upper chamber 18 of a refrigerant heater 15. The refrigerant containing oil is dropped from an upper part of a thermal conducting pipe 20 passing through the upper chamber along the lower part, the refrigerant gas is evaporated and only oil is stored at the bottom part. A solenoid valve 17 disposed at a connection pipe for connecting the evaporator with the refrigerant heater is controlled to be opened or closed by an oil surface adjusting device 16. In this way, oil of about 100% can be continuously purified and further it is possible to eliminate a phenomenon of foaming refrigerant in the refrigerant heater when the freezer is energized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for extracting oil mixed in refrigerant in an evaporator in a refrigeration system using a compressor.

[Conventional technology]

FIG. 3 is a refrigeration cycle diagram showing an example of an oil refining device in a conventional refrigeration system. In the figure, 1 is a compressor, 2
is a condenser, 3 is an expansion valve, 4 is an evaporator, 5 is a discharge pipe that connects the compressor 1 and the condenser 2, 6 is a liquid outlet pipe that connects the condenser 2 and the expansion valve 3, and 7 is an expansion pipe. A liquid inlet pipe 8 connects the valve 3 and the evaporator 4, and a suction pipe 8 connects the evaporator 4 and the compressor 1, forming a refrigeration cycle of the refrigerator. 9 is a refrigerant heater having a heater 9a that extracts oil mixed in the refrigerant in the evaporator 4 and returns it to the compressor 1;
This refrigerant heater 9 is connected to the evaporator 4 via a connecting pipe 10. 11 is a connecting pipe that connects the refrigerant heater 9 and the suction pipe 8; 12.13 is the bottom of the refrigerant heater 9 and the compressor 1;
This is an oil return pipe that connects the two via the oil pump 14.

Next, the operation will be explained.

First, the refrigerant containing oil from the evaporator 4 is guided to the refrigerant heater 9 through the connecting pipe 10 and heated by the heater 9a. Therefore, the refrigerant evaporates and the refrigerant gas is guided to the suction pipe 8 through the connecting pipe 11. By continuously guiding the refrigerant to the refrigerant heater 9 and heating it in this way, concentrated oil always accumulates at the bottom of the refrigerant heater 9, and this concentrated oil is returned to the oil by the oil pump 14. Compressor 1 through pipe 12.13
will return to. In addition, as a related art of the conventional example, there is, for example, Japanese Patent Publication No. 1-20697.

[Problem to be solved by the invention]

Since the oil refining device in the conventional refrigeration system is configured as described above, the refrigerant containing oil always flows into the refrigerant heater 9 via the connecting pipe 10, while the refrigerant is heated by the heater 9a. Because refrigerant gas is generated, the concentration of oil that accumulates at the bottom of the refrigerant heater 9 is balanced at a predetermined concentration due to the capacity of the heater 9a, and the oil concentration cannot be brought close to 100 g. There was a problem. Furthermore, when the refrigerator is stopped and restarted in a state where the concentration is balanced at a certain concentration, the refrigerant in the refrigerant heater 9 forms, and the refrigerant gas and oil are simultaneously sucked into the suction pipe 8. There is a problem that the oil in the refrigerant heater 9 runs out, and to prevent this, it is necessary to separately provide an oil tank and a heater (not shown).
There was a problem that the device was complicated and the cost was high.

This invention was made to solve the above-mentioned problems, and it is a refrigeration system that makes it possible to continuously refine nearly 100 inches of oil and eliminates the forming phenomenon of the refrigerant in the refrigerant heater when starting the refrigerator. The purpose is to obtain an oil refining device in the device.

[Means to solve the problem]

The oil refining device in the refrigeration device according to the present invention includes a compressor,
A refrigeration cycle is formed by a condenser, an expansion valve, an evaporator, and a refrigerant path connecting these, and a refrigerant heater for extracting oil mixed in the refrigerant is connected to the evaporator and compressor through a route different from the refrigeration cycle. an upper chamber formed by a partition plate having a weir and in which the oil-containing refrigerant supplied from the evaporator is temporarily stored; and a heat transfer tube containing a heater that passes through the partition plate. a refrigerant heater consisting of; an oil level regulator provided in the refrigerant heater to adjust the amount of oil accumulated on the bottom surface of the refrigerant heater; connected between the evaporator and the refrigerant heater; It is equipped with a solenoid valve whose opening and closing are controlled by the oil level regulator.

[For production]

The oil refining device of the present invention introduces oil-containing refrigerant from the evaporator to the upper chamber of the refrigerant heater, and in the process of dropping the oil-containing refrigerant from the upper part to the lower part of the heat transfer tube that penetrates the upper chamber. The refrigerant gas is evaporated and only the oil is stored at the bottom, and the solenoid valve provided in the connecting pipe connecting the evaporator and the refrigerant heater is opened and closed by the oil level regulator. This allows for nearly 100% oil to be refined continuously, and also eliminates the forming phenomenon of the refrigerant in the refrigerant heater when starting up the refrigerator.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a refrigeration cycle diagram showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing a refrigerant heater. In FIG. 1, the same or equivalent parts as in FIG. Omit duplicate explanations. In the figure, 15 is a refrigerant heater connected to the evaporator 4 by a connecting pipe 10, the details of which will be described later.
16 is an oil level regulator that adjusts the amount of oil stored at the bottom of the refrigerant heater 15; 17 is a solenoid valve provided in the connecting pipe 10; this solenoid valve 17 is opened and closed by a signal from the oil level regulator 16; do.

1B is an upper chamber formed by a partition plate 19 having a weir 19a in the refrigerant heater 15;
8 temporarily stores the oil-containing refrigerant introduced from the connecting pipe 10. Reference numeral 20 denotes a heat exchanger tube that passes through the center of the partition plate 19. This heat exchanger tube 20 is provided with spiral fins 20a, and a heater 9a is inserted into the heat exchanger tube 20.

Next, the operation will be explained.

Compressor 1, discharge pipe 5, condenser 2, liquid outlet pipe 6, expansion valve 3
, the refrigeration cycle through liquid inlet pipe 7, evaporator 4 and suction pipe 8, the flow of refrigerant through connecting pipe 10.11 and the flow of oil returned to compressor 1 through oil return pipe 12.13. Since this is the same as the conventional example, its explanation will be omitted.

The oil-containing refrigerant taken out from the evaporator 4 passes through the solenoid valve 17 and the connecting pipe 10 and flows into the upper chamber 18 of the refrigerant heater 15 . This refrigerant accumulates until it overflows the weir 19a, and the overflowed refrigerant passes through the weir 19a and the heat exchanger tube 2.
It falls through the gap with 0. This fallen refrigerant is heated by the heater 9a in the process of gradually falling along the spiral fins 20a provided on the heat exchanger tube 20, and is heated by the heater 9a.
Only the refrigerant evaporates while reaching the bottom of 0. and,
The evaporated refrigerant gas is allowed to escape through the connecting pipe 11 to the low pressure side of the compressor 1, and the concentrated oil is dripped into the bottom of the refrigerant heater 15. Afterwards, when the oil dripping from the lower part of the heat transfer tube 20 accumulates at the bottom of the refrigerant heater 15 more than necessary, the oil level regulator 16 detects this and sends a signal to the solenoid valve 17 to turn the solenoid valve 17 on. Close to cut off the inflow of refrigerant. The oil is sent to the compressor 1 by the oil pump 14, but when the oil level drops, the solenoid valve 17 is opened by a signal from the oil level regulator 16, and the oil is again supplied to the refrigerant heater 15 and purified. That will happen.

In addition, in the above embodiment, the explanation was made using one heat exchanger tube, but
The number of heat exchanger tubes and heaters can be selected as appropriate depending on the amount of oil required for refining.

〔Effect of the invention〕

As described above, according to the present invention, an oil refining device in a refrigeration system is used to guide oil-containing refrigerant from an evaporator to an upper chamber of a refrigerant heater, and to direct oil-containing refrigerant from the upper part of a heat transfer tube passing through the upper chamber. In the process of falling along the bottom, the refrigerant gas is evaporated so that only the oil is stored at the bottom, and a solenoid valve installed in the connecting pipe connecting the evaporator and the refrigerant heater is used to adjust the oil level. Since the system is configured to open and close by controlling the opening and closing of the refrigerant, it is possible to continuously refine nearly 100% of the oil, and it is also effective in eliminating the forming phenomenon of the refrigerant in the refrigerant heater when starting up the refrigerator.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram showing an oil refining device in a refrigeration system according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view showing a refrigerant heater, and Fig. 3 is an example of an oil refining device in a conventional refrigeration system. It is a refrigeration cycle diagram showing. 1... Compressor, 2... Condenser, 3... Expansion valve, 4
... Evaporator, 15... Refrigerant heater, 16... Oil level regulator, 17... Solenoid valve, 18... Upper chamber, 19...
... Partition plate, 19a... Weir, 20... Heat exchanger tube. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Patent applicant: Mitsubishi Electric Corporation (2 others) Figure

Claims (1)

[Claims] A refrigeration cycle is formed by a compressor, a condenser, an expansion valve, an evaporator, and a refrigerant path connecting these, and a refrigerant heater for extracting oil mixed in the refrigerant is connected to the evaporator through a path different from the refrigeration cycle. In an oil refining device in a refrigeration system connected between the compressor, the upper chamber is formed by a partition plate having a weir and passes through the partition plate and an upper chamber in which a refrigerant containing oil supplied from the evaporator is temporarily stored. a refrigerant heater made of a heat transfer tube containing a heater; an oil level regulator provided in the refrigerant heater to adjust the amount of oil accumulated on the bottom of the refrigerant heater; the evaporator and the refrigerant heater; An oil refining device for a refrigeration system, comprising: a solenoid valve connected between the oil level controller and the solenoid valve, the opening and closing of which is controlled by the oil level regulator.