JPH0363476A - Oil recovery device of freezer - 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] [Industrial application field] The present invention relates to an oil recovery device for a refrigerator.

[Conventional technology]

A conventional oil recovery device for a refrigerator is shown in FIGS. 2 and 3.

In a heat exchanger for a refrigerator consisting of an evaporator 1 and a condenser 2, a refrigerant liquid containing oil with a relatively high concentration above the refrigerant liquid level in the evaporator 1 is connected to a separate heater 3 through a pipe 5. to this heater 3.

A heating copper pipe 4 is provided, through which the discharge gas of the compressor is passed through a pipe 8, and the refrigerant liquid is heated and evaporated in a heater.
The generated gas is guided to the suction port of the compressor via piping 6.

On the other hand, the oil separated in the heater is led to the oil tank of the compressor via piping 7. Note that the method for returning the oil will not be discussed here.

As described above, conventionally, the high-temperature gas discharged from a compressor as a heating source is passed through a heat exchanger tube and then connected to a heat exchanger.

[Problem to be solved by the invention]

In the above conventional technology, the heat source is the discharge gas of the compressor, which is passed through a steel pipe installed in the heater, and the heated gas is returned to the evaporator. This causes loss for the compressor and reduces efficiency. The decline could not be avoided. Furthermore, the structure of the heater has a large number of parts, which is a factor in increasing costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide an oil recovery device for a refrigerator that has a simple structure without reducing operating efficiency.

[Means to solve the problem]

To achieve the above objective, use the temperature inside the condenser as a heating source to separate the refrigerant liquid and oil.

The amount of heat conducted through the body plate of the condenser is used to heat and evaporate the refrigerant liquid in the refrigerant liquid reservoir provided in a part of the body plate, separating the refrigerant liquid and oil. It is.

[Effect]

The heat inside the condenser is radiated to the outside through the body plate,
This heat dissipation does not result in loss in the refrigeration cycle.

Therefore, in order to actively utilize this heat radiation, a part of the body plate is used as a heating plate for the refrigerant liquid, a refrigerant liquid reservoir is provided on the outer surface of the body plate, and a part of the liquid reservoir is also served by the condenser body plate. The structure is as follows.

The refrigerant gas heated and evaporated within the refrigerant reservoir is guided to the suction port of the compressor. This evaporative gas is sucked into the compressor again, resulting in a loss, but its value is usually small and can be ignored.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS.

In a refrigerator heat exchanger composed of an evaporator 1 and a condenser 2, a refrigerant reservoir 9 is provided in a part of the body plate of the condenser 2,
This refrigerant liquid reservoir 9 has a weir 1 having a partial cutout inside.
Further, the refrigerant reservoir 9 is connected to a pipe 5 communicating with the evaporator 1, a pipe 6 communicating with the compressor suction port, and a pipe 7 communicating with the compressor oil tank.

Next, the operation will be explained.

From the evaporator l, the refrigerant liquid is led to the refrigerant liquid reservoir 9 via the pipe 5 through a liquid intake port arranged at a position where the refrigerant liquid containing relatively high concentration of oil above the refrigerant liquid level can be taken in. A part of the refrigerant liquid reservoir 9 also serves as the body plate of the condenser, and the collected refrigerant liquid is heated by heat radiation transmitted from the condenser through the body plate, evaporates, and partially becomes refrigerant gas. Refrigerant liquid reservoir 9
The refrigerant liquid inside becomes concentrated and the oil concentration becomes even higher.

The generated refrigerant gas is returned via the pipe 6 to the compressor suction port where the refrigeration cycle volume and pressure are reduced. Further, the oil concentrated in the refrigerant reservoir 9 is returned to the compressor oil tank via the pipe 7. Note that methods for returning oil to the compressor oil tang include a method in which a portion of the high-pressure oil increased by the oil pump is passed through a venturi to draw up the oil in the refrigerant reservoir 9;
There is a method of drawing up the oil by providing an ejector using the pressure difference between the condenser and the pressure inside the compressor oil tank, but the explanation with reference to the drawings is omitted here.

Further, since the refrigerant liquid reservoir 9 is provided with a weir, the refrigerant liquid led from the evaporator 1 is first stored between the weir 10 and the body plate 11 and heated, and the concentrated refrigerant liquid is transferred to the weir 10. It overflows from the upper part and flows into the partition chamber 12.
The liquid is extracted from the compressor oil tank and returned to the compressor oil tank.

〔Effect of the invention〕

According to the present invention, the function of a heater can be provided with a relatively simple structure, thereby making it possible to reduce the cost.

[Brief explanation of drawings]

Fig. 1 is a system diagram of an embodiment of the present invention, Fig. 2 is a partial sectional view of Fig. 4, Fig. 3 is a system diagram of the conventional system, and Fig. 4 is a partial sectional view of Fig. 3. It is. 1... Evaporator, 2... Condenser, 3... Heater, 4
... Copper piping for heating, 5, 6, 7.8 ... Piping, 9.
・・Refrigerant liquid reservoir 1st figure 1st cause

Claims (1)

[Claims] 1. In a refrigerator consisting of an evaporator, a condenser, a compressor, and a drive source that drives them, the oil supply system that lubricates the bearings of the compressor coexists with the refrigerant atmosphere, so leakage into the refrigerant system In order to collect the oil into the compressor oil tank, a refrigerant liquid storage container is installed on the surface of the condenser body plate using the refrigerant gas temperature or liquid temperature in the condenser and the body plate of the condenser also serves as a heating plate. The refrigerant gas generated by heating the refrigerant liquid in the refrigerant storage container is drawn into the compressor through piping that leads the refrigerant liquid mixed with oil from the upper part of the refrigerant liquid to the refrigerant storage container and the condenser body plate. 1. An oil recovery device for a refrigerating machine, characterized in that it is provided with piping for returning the oil to the refrigerant storage container and piping for guiding oil concentrated in a refrigerant reservoir to an oil tank of a compressor.