JPH08303908A - Refrigerator - Google Patents

Abstract

PURPOSE: To improve the oil returning property to a compressor, and prevent a wear at the mechanical part caused by a lack of an oil film, from being promoted. CONSTITUTION: HFC134a is used as a refrigerant, and a compressor 1, evaporator 4 and accumulator 5a are provided for a refrigerating cycle. For such a refrigerating cycle, an oil which does not have a mutual solubility with the refrigerant is used as the lubrication oil for the compressor 1, and an outlet side piping of the evaporator is connected to the accumulator 5a from the bottom side. Then, from the top side of the accumulator 5a, a suction piping of the compressor 1 is inserted by a length which is 0-50% of the length of the accumulator 5a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator which uses hydrofluorocarbon as a main component as a refrigerant.

[0002]

2. Description of the Related Art An example of a conventional refrigeration system is shown in FIG. FIG. 5 shows a refrigeration apparatus using HFC134a refrigerant, 1 is a compressor for compressing refrigerant gas, 2 is a condenser for condensing high-pressure refrigerant gas discharged from the compressor 1, 3 is a capillary tube, and 4 is an evaporator. 5 is an accumulator, and 6 is refrigerating machine oil that is stored in the compressor 1 to lubricate a sliding portion of the compressor 1 and seal the compressor 1.

Next, the behavior of the refrigerating machine oil 6 will be described.
The refrigerant compressed by the compressor 1 is discharged to the condenser 2. At this time, a part of the refrigerating machine oil 6 is discharged from the compressor 1 together with the refrigerant. The discharged refrigerating machine oil 6 contains a condenser 2, a capillary tube 3, an evaporator 4, and an accumulator 5.
Return to compressor 1 through.

[0004]

However, in the conventional refrigeration system, when the compressor is stopped, the liquid refrigerant returns from the suction port into the container of the compressor 1, and when restarted, the refrigerating machine oil 6 in the compressor 1 together with the liquid refrigerant, The refrigerating machine oil 6 taken out from the compressor 1 into the refrigeration system has a low compatibility with the HFC.
Since the refrigerant is the 134a refrigerant, it is difficult to return to the compressor 1 until it reaches a certain flow rate (= flow velocity) or more, which causes a problem such as causing compressor trouble due to insufficient lubrication.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a highly reliable refrigerator in which the refrigerating machine oil in the accumulator is reliably returned to the compressor without being accumulated. To do.

[0006]

In order to achieve the above object, the refrigerator according to the present invention has an evaporator outlet side pipe connected to the accumulator from the lower side, and a compressor suction line from the upper side of the accumulator to the accumulator. 0 to 50% of the length was inserted.

In addition to the above structure, a liquid refrigerant return prevention hole is provided in the portion of the suction pipe of the compressor inserted into the accumulator.

Further, the inlet / outlet of the accumulator is oriented in the left-right direction, the evaporator outlet side pipe is connected to one end of the accumulator, and the suction pipe of the compressor is connected to the other end of the accumulator above the evaporator outlet side pipe connecting position. Of.

Further, the shape of the accumulator is made to be "V", the evaporator outlet side pipe is connected to one end of the accumulator, and the suction pipe of the compressor is connected to the other end of the accumulator.

[0010]

With the above structure, the refrigerating machine oil can be surely returned to the compressor without accumulating a large amount of oil in the accumulator, and at the same time, the surplus refrigerant can be collected depending on the load condition of the device.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigerator according to an embodiment of the present invention will be described below with reference to the drawings. The same components as those in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 1, the refrigerator according to the first embodiment of the present invention comprises a compressor 1 for compressing a refrigerant into a high-temperature and high-pressure gas, a condenser 2 for cooling the refrigerant and condensing it. It comprises a capillary tube 3 for reducing the pressure of the liquid refrigerant, an evaporator 4 for evaporating the liquid refrigerant, and an accumulator 5a for retaining the liquid refrigerant that has not been evaporated in the evaporator 4.

Refrigerating machine oil 6 is stored in the compressor 1 to lubricate the sliding portion of the compressor 1 and seal the compression chamber.

The accumulator 5a is connected to the outlet side pipe of the evaporator 4 from the lower side, and the suction pipe of the compressor 1 is connected to the accumulator 5 from the upper side of the accumulator 5a.
50% of the length of a is inserted.

In the above structure, a part of the refrigerating machine oil 6 is discharged from the compressor 1 together with the refrigerant, and the accumulator 5a.
If floating liquid stays in the liquid refrigerant, the accumulator 5
The evaporator 4 outlet side pipe is connected to a from below, and the suction pipe of the compressor 1 is connected to the accumulator 5a.
Since 50% of the length is inserted, the refrigerating machine oil 6 returns to the compressor 1 when the liquid refrigerant retention amount increases.

As described above, the outlet side pipe of the evaporator 4 is connected to the accumulator 5a from below, and the suction pipe of the compressor 1 is inserted from the upper side of the accumulator 5a by 50% of the length of the accumulator 5a. The refrigerating machine oil 6 can be returned to the compressor 1.

As shown in FIG. 2, the refrigerator of the second embodiment of the present invention uses an accumulator 5b instead of the accumulator 5a of the first embodiment.

Accumulator 5b in the second embodiment
Is the accumulator 5b in the suction pipe of the compressor 1.
It is different from the accumulator 5a of the first embodiment in that a liquid refrigerant return prevention hole 7 is provided in the insertion portion.

In the above structure, a part of the refrigerating machine oil 6 is discharged from the compressor 1 together with the refrigerant, and the accumulator 5b.
Accumulator 5 stays while floating in the liquid refrigerant.
The evaporator 4 outlet side pipe is connected to b from below, and the suction pipe of the compressor 1 is connected to the accumulator 5b.
50% of the length of the accumulator 5b is inserted, and the liquid refrigerant return prevention hole 7 is provided in the inserted portion, so that the amount of liquid refrigerant retained increases, and when 50% or more of the length of the accumulator 5b is retained, the refrigeration oil 6 becomes liquid refrigerant. Return to the compressor 1 through the return prevention hole 7.

As described above, the evaporator 4 outlet side pipe is connected to the accumulator 5b from below, and the suction pipe of the compressor 1 is inserted 50% of the length of the accumulator 5b from above the accumulator 5b. The refrigerating machine oil 6 can be returned to the compressor 1 by having the liquid refrigerant return prevention hole 7 in the insertion portion.

As shown in FIG. 3, the refrigerator of the third embodiment of the present invention uses an accumulator 5c instead of the accumulator 5a of the first embodiment.

Accumulator 5c in the third embodiment
Is connected to the outlet side pipe of the evaporator 4 at one end of the accumulator 5c, and the outlet side of the accumulator 5c is connected to the outlet side pipe connection position of the compressor 4 at the other end of the accumulator 5c. The suction pipe is connected.

In the above structure, a part of the refrigerating machine oil 6 is discharged from the compressor 1 together with the refrigerant and stays in the accumulator 5c while floating in the liquid refrigerant.
Has the inlet and outlet in the left-right direction, the outlet side pipe of the evaporator 4 is connected to one end of the accumulator 5c, and the suction pipe of the compressor 1 is provided at the other end of the accumulator 5c above the outlet side pipe connection position of the evaporator 4. Since the refrigerating machine oil 6 returns to the compressor 1 without resistance from the accumulator 5c when the amount of liquid refrigerant increases, the horizontal width of the refrigerating machine oil 6 is wide at the same time, so that abrupt increase of liquid refrigerant is prevented and liquid refrigerant return is prevented. To do.

As described above, the accumulator 5c is
The inlet and outlet are in the left-right direction, the outlet side pipe of the evaporator 4 is connected to one end of the accumulator 5c, and the suction pipe of the compressor 1 is connected to the other end of the accumulator 5c above the outlet side pipe connection position of the evaporator 4. By connecting, the refrigerating machine oil 6 can be returned to the compressor 1, and liquid refrigerant return can be prevented.

As shown in FIG. 4, the refrigerator of the fourth embodiment of the present invention uses an accumulator 5d instead of the accumulator 5a of the first embodiment.

Accumulator 5d in the fourth embodiment
Has a shape of "V", the outlet side pipe of the evaporator 4 is connected to one end of the accumulator 5d, and the suction pipe of the compressor 1 is connected to the other end of the accumulator 5d.

In the above structure, a part of the refrigerating machine oil 6 is discharged from the compressor 1 together with the refrigerant, and the accumulator 5d.
Accumulator 5 stays while floating in the liquid refrigerant.
Since the shape of d is'to the letter ', the outlet side pipe of the evaporator 4 is connected to one end of the accumulator 5d, and the suction pipe of the compressor 1 is connected to the other end of the accumulator 5d. When the amount of liquid refrigerant increases, the refrigerating machine oil 6 returns to the compressor 1 without resistance from the accumulator 5d.

As described above, the shape of the accumulator 5d is "V", the outlet side pipe of the evaporator 4 is connected to one end of the accumulator 5d, and the compressor 1 is connected to the other end of the accumulator 5d. The refrigerating machine oil 6 can be returned to the compressor 1 without resistance by connecting the suction pipe of the above.

[0029]

As described above, according to the present invention, the evaporator outlet side pipe is connected to the accumulator from below, and the compressor suction pipe is inserted from the upper side of the accumulator in an amount of 0 to 50% of the length of the accumulator. I did.

In addition to the above structure, a liquid refrigerant return preventing hole is provided in the portion of the suction pipe of the compressor inserted into the accumulator.

In addition, the inlet and outlet of the accumulator are oriented in the left-right direction, the evaporator outlet side pipe is connected to one end of the accumulator, and the suction pipe of the compressor is connected to the other end of the accumulator above the evaporator outlet side pipe connection position. Of.

Further, the shape of the accumulator is made to be "L", the evaporator outlet side pipe is connected to one end of the accumulator, and the suction pipe of the compressor is connected to the other end of the accumulator.

Therefore, the refrigerating machine oil can be surely returned to the compressor without accumulating a large amount of oil in the accumulator, and at the same time, the surplus refrigerant can be accumulated depending on the liquid refrigerant return prevention and the load condition of the apparatus. A highly reliable refrigerator with good oil return to the compressor can be obtained.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of a first embodiment of a refrigerator according to the present invention.

FIG. 2 is a refrigeration cycle diagram of a second embodiment of the refrigerator according to the present invention.

FIG. 3 is a refrigeration cycle diagram of a third embodiment of the refrigerator according to the present invention.

FIG. 4 is a refrigeration cycle diagram of a fourth embodiment of the refrigerator according to the present invention.

FIG. 5: Refrigeration cycle diagram of a conventional refrigerator

[Explanation of symbols]

 1 Compressor 4 Evaporator 5a, 5b, 5c, 5d Accumulator 6 Refrigerator oil 7 Liquid refrigerant return prevention hole

Claims (4)

[Claims] 1. In a refrigeration cycle using HFC134a as a refrigerant and having a compressor, an evaporator and an accumulator, a lubricating oil for the compressor using an oil having no mutual solubility in the refrigerant and the accumulator from below are used. The evaporator outlet side pipe is connected, and the suction pipe of the compressor is inserted from 0% to 50% of the length of the accumulator from the upper side of the accumulator. 2. In a refrigeration cycle using HFC134a as a refrigerant and having a compressor, an evaporator and an accumulator, a lubricating oil for the compressor using an oil having no mutual solubility in the refrigerant and the accumulator from below are used. The evaporator outlet side pipe is connected, and the suction pipe of the compressor is inserted from 0% to 50% of the length of the accumulator from the upper side of the accumulator, and the insertion portion has a liquid refrigerant return prevention hole. A refrigerator characterized by. 3. In a refrigeration cycle using HFC134a as a refrigerant and having a compressor, an evaporator, and an accumulator, the compressor lubricating oil and the accumulator inlet / outlet, which are oils that have no mutual solubility in the refrigerant, are provided. The evaporator outlet side pipe is connected to one end of the accumulator, and the suction pipe of the compressor is connected to the other end of the accumulator above the evaporator outlet side pipe connection position. A refrigerator characterized by. 4. In a refrigeration cycle using HFC134a as a refrigerant and having a compressor, an evaporator and an accumulator, the lubricating oil of the compressor using an oil having no mutual solubility in the refrigerant and the shape of the accumulator are ' The refrigerator is characterized in that the evaporator outlet side pipe is connected to one end of the accumulator and the suction pipe of the compressor is connected to the other end of the accumulator.