JPH08271098A - Refrigerating system - Google Patents

Abstract

PURPOSE: To prevent an abnormal drop in suction pressure by a method wherein a header consists of a vessel to store liquid refrigerant, a refrigerant inlet pipe connected to the upper part of the vessel and a refrigerant outlet pipe inserted from below and a part of the outlet pipe is made up of a permeable membrane whose pours have diameters within a specified range. CONSTITUTION: A header 5 has such a construction that a refrigerant inlet pipe 10 is connected to the upper part of a vessel 11 and a refrigerant outlet pipe 9 is inserted into the vessel 11 from below. A hole is provided in a part of the refrigerant outlet pipe 9 and covered with a polytetrafluoroethylene-made permeable membrane 13 which has pours with diameters of 0.01-3μm and is supported by a porous resin 12. An evaporator is connected to the upper part of the inlet pipe 10 and a compressor is connected to the lower part of the outlet pipe 9 via a suction pipe 6. Thereby, an abnormal drop in suction pressure can be prevented and the specified refrigerating performance can be maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system using a refrigerant and a lubricating oil of a compressor which has no mutual solubility in the refrigerant.

[0002]

2. Description of the Related Art In recent years, JP-A-5-157379 discloses a refrigeration system using a lubricating oil of a compressor in which the refrigerant and the refrigerant have no mutual solubility.

The conventional refrigeration system will be described below with reference to the drawings. FIG. 9 (a) is a schematic view of a conventional refrigeration system, and FIG. 9 (b) is a cross-sectional view of a header of the conventional refrigeration system. In FIGS. 9A and 9B, 1 is a compressor that compresses a refrigerant gas, 2 is a condenser that condenses the refrigerant gas discharged from the compressor, 3 is a capillary tube that is an expansion mechanism, and 4 Is an evaporator, 5 is an intake pipe extending upward from the outlet side of the evaporator 4 and extending upward into the header 5, and 7 is refrigerating machine oil that lubricates sliding parts in the compressor, such as hard alkylbenzene oil and low temperature fluid. Refrigerating machine oil such as soft alkylbenzene oil, polyalphaolefin, paraffinic mineral oil, naphthenic mineral oil, etc., which have excellent properties, are used alone or in combination, and have little or no mutual solubility with refrigerants such as HFC134a containing hydrofluorocarbon as a main component. It is a thing. Reference numeral 8 denotes an oil return hole provided on the upper side surface of the suction pipe 6 inserted into the header 5.

Next, the operation will be described. The refrigerant discharged from the compressor 1 is condensed in the condenser 2, expanded under reduced pressure in the capillary tube 3, evaporated in the evaporator 4, and the refrigerant that cannot be completely evaporated in the evaporator 4 is stored in the header 5. ,
Only the gas phase component is sucked into the compressor 1 through the suction pipe 6. At this time, the refrigerating machine oil 7 is discharged from the compressor 1 together with the refrigerant, flows in the pipe, and reaches the evaporator 4.

The refrigerating machine oil 7 flows in the evaporator 4 together with the refrigerant that evaporates and vaporizes, and enters the header 5 or is stored in the header together with the liquid refrigerant stored therein. here,
The refrigerating machine oil 7 is separated into two layers, and the refrigerating machine oil 7 floats on the liquid refrigerant.

When the liquid level of the refrigerating machine oil 7 reaches the oil return hole 8, the refrigerating machine oil 7 is sucked into the suction pipe 6 through the oil return hole 8 and then into the compressor 1.

[0007]

However, in the above conventional structure, the refrigerating machine oil 7 stays in the header 5 and is separated into the upper refrigerating machine oil 7 and the lower liquid refrigerant into two layers. In this case, there is a possibility that the refrigerating machine oil 7 with increased viscosity may confine the liquid refrigerant and may not return to the compressor 1. At this time, the suction pressure of the compressor 1 is reduced, and a predetermined refrigeration performance cannot be obtained.

[0008]

Therefore, the refrigeration cycle of the present invention comprises a compressor, a condenser, an expansion mechanism, an evaporator, and
A header and an annular connection, in a refrigeration cycle comprising a refrigerant and a refrigerating machine oil having no or little mutual solubility in the refrigerant, the header connects a refrigerant inflow pipe above a container storing a liquid refrigerant. , Has a structure in which a refrigerant outflow pipe is inserted below, and a part of the outflow pipe is formed of a permeable membrane.

Further, a porous filter is provided at the tip of the inflow pipe. In addition, an adsorbent was installed below the inside of the container.

Also, a compressor, a condenser, an expansion mechanism,
An evaporator and a header are connected in an annular shape, and in a refrigeration cycle provided with a refrigerant and a refrigerating machine oil having no or little mutual solubility in the refrigerant, the header is a refrigerant inflow pipe above a container for storing a liquid refrigerant. Has a structure in which a refrigerant outflow pipe is connected to the side, and the lower part of the container has a bellows-like structure.

Further, a compressor, a condenser, an expansion mechanism,
An evaporator and a header are connected in an annular shape, and in a refrigeration cycle provided with a refrigerant and a refrigerating machine oil having no or little mutual solubility in the refrigerant, the header is a refrigerant inflow pipe above a container for storing a liquid refrigerant. And a structure in which a refrigerant outflow pipe was connected to the side, and a bellows was installed below the inside of the container.

[0012]

With the above-described structure, the refrigeration system of the present invention is provided in a part of the outflow pipe when the liquid refrigerant stored in the header is contained by the refrigerating machine oil of high viscosity and the suction pressure of the refrigeration system drops. Through the permeable membrane,
By returning the liquid refrigerant to the compressor little by little, it is possible to prevent an abnormal decrease in suction pressure.

Further, by providing a filter at the inlet of the header, it is possible to prevent contaminants such as residues of piping processing oil existing in the refrigeration system from blocking the permeable membrane, and to gradually cool the liquid refrigerant when the suction pressure decreases. The function of the permeable membrane to restore the temperature can be stably exerted.

Further, by installing an adsorbent inside the header, it is possible to prevent ionic sludge such as an organic acid or an organic acid metal salt generated in the refrigeration system from blocking the permeable membrane, and to reduce the suction pressure when the suction pressure decreases. The function of the permeable membrane that returns the liquid refrigerant little by little can be stably exhibited.

Further, since the lower part of the header has a bellows structure, the liquid refrigerant stored inside the header is confined by the high-viscosity refrigerating machine oil, and when the suction pressure of the refrigeration system drops, the bellows part shrinks. By reducing the volume of the refrigerant reservoir and returning the liquid refrigerant to the compressor little by little along with the refrigerating machine oil, while suppressing the deterioration of lubricity due to the suction of the liquid refrigerant, it is possible to prevent an abnormal decrease in the suction pressure of the compressor. be able to.

Further, since the header has a bellows structure, the mechanical strength of the bellows can be lowered,
By reducing the wall thickness, it reacts sensitively to changes in suction pressure, and when the suction pressure drops, the bellows part expands and the volume of the refrigerant reservoir of the header is reduced, and the liquid refrigerant is gradually returned to the compressor along with the refrigeration oil. As a result, it is possible to prevent an abnormal decrease in the suction pressure of the compressor while suppressing a decrease in lubricity due to the suction of the liquid refrigerant.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the refrigeration system according to the present invention will be described with reference to the drawings. It should be noted that the same configurations as those of the conventional one are denoted by the same reference numerals and detailed description thereof will be omitted. FIG. 1 is a schematic view of a refrigeration system according to a first embodiment of the present invention, and FIG. 2 is a sectional view of a header of the same embodiment.

In FIGS. 1 and 2, the header 5 has a structure in which a refrigerant inflow pipe 10 is connected to the upper side of a container 11 for storing a liquid refrigerant, and a refrigerant outflow pipe 9 is inserted in the lower side thereof. Is installed so that the permeable membrane 13 supported by the porous resin 12 closes the hole provided in a part of the. The permeable membrane 13 is made of polytetrafluoroethylene having a pore diameter of 0.3 μm. Further, the evaporator 4 is connected above the inflow pipe 10, and the compressor 1 is connected below the outflow pipe 9 via the suction pipe 6.

The operation of the refrigeration system configured as described above will be described below. The refrigerating machine oil 7 is separated into two phases with a refrigerant mainly composed of hydrofluorocarbon, such as HFC134a, which has no mutual solubility, and has a specific gravity smaller than that of the refrigerant, and thus floats above the refrigerant stored in the header 5. Since the temperature is extremely low near the outlet of the evaporator 4, the refrigerating machine oil 7 has a high viscosity, and the refrigerant stored in the header 5 is in a semi-sealed state. Then, when the refrigeration system runs out of refrigerant due to load fluctuations and a dry refrigerant containing no liquid refrigerant begins to flow into the header 5, the suction action of the compressor 1 causes the refrigerant pressure in the vapor phase from the evaporator 4 to the suction pipe 6 to rise. descend. At this time, a pressure difference is generated between the liquid refrigerant sealed in the refrigerating machine oil 7 in the header 5 and the gas phase refrigerant in the outflow pipe 9, and the liquid refrigerant in the header 5 supports the permeable membrane 13 and it. It permeates the porous resin 12 and gradually flows into the outflow pipe 9. A small amount of the liquid refrigerant that has entered the outflow pipe 9 passes through the suction pipe 6 while being evaporated, and is sucked into the compressor 1. As a result, it is possible to prevent the suction pressure of the compressor 1 from decreasing and maintain a predetermined refrigeration performance.

When the refrigeration system becomes overheated with refrigerant, a constant amount of liquid refrigerant always flows into the header 5, so that a part of it flows directly into the outflow pipe 9 to keep the refrigerant pressure constant.

As a result, there is almost no pressure difference between the liquid refrigerant in the header 5 and the vapor phase refrigerant in the outflow pipe 9, and the liquid refrigerant in the header 5 cannot pass through the permeable membrane. As a result, since a part of the liquid refrigerant flowing into the header 5 is continuously stored, the excessive refrigerant state is alleviated, and a large amount of the liquid refrigerant is sucked into the compressor 1 to cause problems such as insufficient lubrication. Can be prevented.

As described above, the refrigeration system of this embodiment is
The compressor 1, the condenser 2, the expansion mechanism 3, the evaporator 4,
In the refrigeration cycle in which the header 5 is connected in an annular shape and the refrigerant and the refrigerating machine oil 7 having no or little mutual solubility in the refrigerant are provided, the header 5 is a container 11 for storing a liquid refrigerant.
Has a structure in which a refrigerant inflow pipe 10 is connected to the upper side and a refrigerant outflow pipe 9 is inserted to the lower side, and a hole provided in a part of the outflow pipe 9 has a pore diameter of 0. Since the permeable membrane 13 made of 3 μm polytetrafluoroethylene is installed so as to be blocked, when the refrigeration system is in a refrigerant shortage state, the liquid refrigerant stored in the header 5 permeates the permeable membrane 13, By flowing into the outflow pipe 9, it is possible to prevent a decrease in suction pressure of the compressor 1 and maintain a predetermined refrigeration performance.

In this embodiment, the permeable membrane 13 is made of polytetrafluoroethylene having a pore size of 0.3 μm, but if the pore size is 0.01 to 3 μm, other materials such as cellulose may be used. The effect of can be expected. Pore size 0.
When the thickness is 01 μm or less, the liquid refrigerant has a low permeation rate, and when it is 3 μm or more, the liquid refrigerant permeates by gravity and cannot be held.

In this embodiment, the porous resin 12 is used to support the permeable membrane 13 in order to compensate for the insufficient strength of the permeable membrane 13. However, a sintered material can be used as long as it does not impair the refrigerant permeation performance and retention performance. The same effect can be expected by using such as.

Next, a second embodiment of the refrigeration system according to the present invention will be described with reference to the drawings. In addition,
The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 3 is a sectional view of a header according to the second embodiment of the present invention. In FIG. 3, a porous filter 15 having a pore diameter of 5 μm is connected below the inflow pipe 10 via a holder 14.

The operation of the refrigeration system configured as described above will be described below. When contaminants such as piping processing oil and cutting powder remaining in the refrigeration system enter the header 5 along with the refrigerant through the inflow pipe 10, the contaminants adhere to the porous filter 15 and flow into the container 11. prevent. As a result, the permeable membrane 13 is prevented from being blocked by the contaminants in the refrigeration system and obstructing the passage of the refrigerant.

As described above, the refrigeration system of this embodiment is
The compressor 1, the condenser 2, the expansion mechanism 3, the evaporator 4,
In the refrigeration cycle in which the header 5 is connected in an annular shape and the refrigerant and the refrigerating machine oil 7 having no or little mutual solubility in the refrigerant are provided, the header 5 is a container 11 for storing a liquid refrigerant.
Has a structure in which a refrigerant inflow pipe 10 is connected above and a refrigerant outflow pipe 9 is inserted below, and a permeable membrane 13 in which a hole provided in a part of the outflow pipe 9 is supported by a porous resin 12 is formed. Since it is installed so as to be closed and the porous filter 15 having a pore diameter of 5 μm is connected to the lower part of the inflow pipe 10 via the holder 14, when the refrigeration system is in a refrigerant shortage state, the header The liquid refrigerant stored in 5 passes through the permeable membrane 13 and flows into the outflow pipe 9, whereby the compressor 1
It is possible to prevent the suction pressure from decreasing and maintain a predetermined refrigerating performance, and it is possible to prevent the permeable membrane 13 from being clogged by contaminants remaining in the refrigeration system.
The effect can be maintained for a long time.

In this embodiment, the porous filter 15 having a pore size of 5 μm is used, but the pore size is 3 to 30 μm.
If so, the same effect can be expected. When the pore diameter is 3 μm or less, the permeation rate of the vapor-phase refrigerant and the refrigerating machine oil 7 is low,
If it is more than m, no effect can be expected because contaminants easily pass through.

Next, a third embodiment of the refrigeration system according to the present invention will be described with reference to the drawings. In addition,
The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 4 is a sectional view of a header according to the third embodiment of the present invention. In FIG. 4, an adsorbent 16 made of activated alumina is installed below the inside of the container 11.

The operation of the refrigeration system configured as described above will be described below. The refrigerant and the refrigerating machine oil 7 are deteriorated when used for a long period of time, and a trace amount of an acidic substance is generated. This acidic substance corrodes the piping in the refrigeration system and parts of the compressor 1, and a small amount of ionic substances such as carboxylates are produced. This ionic substance together with the refrigerant is the inflow pipe 1
When entering the header 5 through 0, the ionic substance is adsorbed by the adsorbent 16 and removes the ionic substance in the refrigerant stored in the container 11. As a result, the permeable membrane 13 is prevented from being blocked by the ionic substance in the refrigeration system and obstructing the passage of the refrigerant.

As described above, the refrigeration system of this embodiment is
The compressor 1, the condenser 2, the expansion mechanism 3, the evaporator 4,
In the refrigeration cycle in which the header 5 is connected in an annular shape and the refrigerant and the refrigerating machine oil 7 having no or little mutual solubility in the refrigerant are provided, the header 5 is a container 11 for storing a liquid refrigerant.
Has a structure in which a refrigerant inflow pipe 10 is connected above and a refrigerant outflow pipe 9 is inserted below, and a permeable membrane 13 in which a hole provided in a part of the outflow pipe 9 is supported by a porous resin 12 is formed. Since the adsorbent 16 made of activated alumina is installed in the lower part of the container 11 so as to be closed, the adsorbent 16 is stored in the header 5 when the refrigeration system is in a refrigerant shortage state. Since the liquid refrigerant permeates the permeable membrane 13 and flows into the outflow pipe 9, it is possible to prevent the suction pressure of the compressor 1 from lowering, maintain a predetermined refrigeration performance, and to generate a small amount of the refrigeration system. It is possible to prevent the permeable membrane 13 from being blocked by the ionic substance and maintain its effect for a long time.

In this embodiment, the adsorbent 16 made of activated alumina was used, but the same effect can be expected if the adsorbent is made of zeolite or the like, the surface of which is ionic and porous.

Next, a fourth embodiment of the refrigeration system according to the present invention will be described with reference to the drawings. In addition,
The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 5 is a schematic diagram of a refrigeration system according to a fourth embodiment of the present invention, and FIG. 6 is a sectional view of a header of the same embodiment.

In FIGS. 5 and 6, the header 5 has a structure in which the refrigerant inflow pipe 10 is connected to the upper side of the container 18 for storing the liquid refrigerant, and the refrigerant outflow pipe 17 is connected to the side thereof. Has a bellows portion 18a at the bottom thereof.

The operation of the refrigeration system configured as described above will be described below. The refrigerating machine oil 7 is separated into two phases with a refrigerant mainly composed of hydrofluorocarbon, such as HFC134a, which has no mutual solubility, and has a specific gravity smaller than that of the refrigerant, and thus floats above the refrigerant stored in the header 5. Since the temperature is extremely low near the outlet of the evaporator 4, the refrigerating machine oil 7 has a high viscosity, and the refrigerant stored in the header 5 is in a semi-sealed state. Then, when the refrigeration system runs out of refrigerant due to load fluctuations and a dry refrigerant containing no liquid refrigerant begins to flow into the header 5, the suction action of the compressor 1 causes the refrigerant pressure in the vapor phase from the evaporator 4 to the suction pipe 6 to rise. descend. At this time, the bellows portion 18a of the container 18, which had a balance between the pressure of the vapor-phase refrigerant in the header 5 and the pressure of the outside air, is reduced by the amount of decrease in the pressure of the vapor-phase refrigerant in the header 5, The refrigerator oil 7 and the liquid refrigerant stored in the container 18 are pushed up. Then, the pushed up refrigerating machine oil 7 and the liquid refrigerant pass through the outflow pipe 17 connected to the side of the container 18 and the suction pipe 6 connected to the inflow pipe 17, and are sucked into the compressor 1. As a result, it is possible to prevent the suction pressure of the compressor 1 from decreasing and maintain a predetermined refrigerating performance.
By sucking the refrigerating machine oil 7 at the same time as the liquid refrigerant into the compressor 1, it is possible to prevent deterioration of lubricity due to the inflow of the liquid refrigerant.

As described above, the refrigeration system of this embodiment is
The compressor 1, the condenser 2, the expansion mechanism 3, the evaporator 4,
In the refrigeration cycle in which the header 5 is connected in an annular shape and the refrigerant and the refrigerating machine oil 7 having no or little mutual solubility in the refrigerant are provided, the header 5 is a container 18 for storing a liquid refrigerant.
Has a structure in which the refrigerant inflow pipe 10 is connected to the upper side of the container and the refrigerant outflow pipe 17 is connected to the side thereof, and the bellows portion 18a is provided in the lower portion of the container 18, so that the refrigeration system is in a refrigerant insufficient state. At this time, the refrigerating machine oil 7 and the liquid refrigerant stored in the header 5 are pushed up and flow into the outflow pipe 17, thereby preventing the suction pressure of the compressor 1 from decreasing and maintaining a predetermined refrigerating performance. In addition, it is possible to prevent deterioration of lubricity due to the inflow of the liquid refrigerant.

Next, a fifth embodiment of the refrigeration system according to the present invention will be described with reference to the drawings. In addition,
The same components as those in the fourth embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 7 is a schematic diagram of a refrigeration system according to a fifth embodiment of the present invention, and FIG. 8 is a sectional view of a header of the same embodiment.

In FIGS. 7 and 8, the header 5 has a structure in which the refrigerant inflow pipe 10 is connected to the upper side of the container 19 for storing the liquid refrigerant, and the refrigerant outflow pipe 17 is connected to the side thereof. The bellows 20 is fixed to the lower part inside. Further, the bellows 20 is filled with gas at a pressure set so as to balance with the pressure of the vapor phase refrigerant in the header 5 which is appropriate.

The operation of the refrigeration system configured as described above will be described below. The refrigerating machine oil 7 is separated into two phases with a refrigerant mainly composed of hydrofluorocarbon, such as HFC134a, which has no mutual solubility, and has a specific gravity smaller than that of the refrigerant, and thus floats above the refrigerant stored in the header 5. Since the temperature is extremely low near the outlet of the evaporator 4, the refrigerating machine oil 7 has a high viscosity, and the refrigerant stored in the header 5 is in a semi-sealed state. Then, when the refrigeration system runs out of refrigerant due to load fluctuations and a dry refrigerant containing no liquid refrigerant begins to flow into the header 5, the suction action of the compressor 1 causes the refrigerant pressure in the vapor phase from the evaporator 4 to the suction pipe 6 to rise. descend. At this time, the bellows 20 fixed in the container 19 that was in balance with the pressure of the vapor phase refrigerant in the header 5
However, the pressure of the vapor-phase refrigerant in the header 5 expands by the amount of the decrease, and pushes up the refrigerating machine oil 7 and the liquid refrigerant stored in the container 19. The refrigerating machine oil 7 and the liquid refrigerant thus pushed up are connected to the side of the container 19 by an outflow pipe 17 and an inflow pipe 17.
Is sucked into the compressor 1 through the suction pipe 6 connected to the.
As a result, the suction pressure of the compressor 1 can be prevented from lowering and a predetermined refrigerating performance can be maintained. Further, by sucking the refrigerating machine oil 7 at the same time as the liquid refrigerant into the compressor 1, it is possible to prevent the liquid refrigerant from flowing in. It is possible to prevent deterioration of lubricity. Further, the pressure of the gas in the bellows 20 can be set appropriately regardless of the pressure of the outside air, and by installing it inside the container 19, the structural strength can be lowered and the flexibility can be increased, and the inside of the header 5 can be improved. It can follow the subtle pressure changes.

As described above, the refrigeration system of this embodiment is
The compressor 1, the condenser 2, the expansion mechanism 3, the evaporator 4,
In the refrigeration cycle in which the header 5 is annularly connected and the refrigerant and the refrigerating machine oil 7 having little or no mutual solubility in the refrigerant, the header 5 is a container 19 for storing a liquid refrigerant.
Has a structure in which the refrigerant inflow pipe 10 is connected to the upper side of the container and the refrigerant outflow pipe 17 is connected to the side thereof, and the bellows 20 is fixed to the lower inside of the container 19, so that the refrigeration system is in a refrigerant insufficient state. At this time, the refrigerating machine oil 7 and the liquid refrigerant stored in the header 5 are pushed up and flow into the outflow pipe 17, thereby preventing the suction pressure of the compressor 1 from decreasing and maintaining a predetermined refrigerating performance. In addition, it is possible to prevent deterioration of lubricity due to the inflow of the liquid refrigerant. Also,
The bellows 20 can follow the slight pressure change near the appropriate pressure and exert its effect.

In this embodiment, the outflow pipe 17 is provided on the side of the container 19, but the same effect can be obtained by inserting the outflow pipe below the container 19. The same effect can be obtained by fixing two or more bellows 20 to the lower portion of the container 19.

[0046]

As described above, according to the present invention, the compressor, the condenser, the expansion mechanism, the evaporator, and the header are connected in an annular shape, and the refrigerant and the refrigerant have no or little mutual solubility. In a refrigeration cycle including a refrigerating machine oil, the header has a structure in which a refrigerant inflow pipe is connected to an upper side of a container that stores a liquid refrigerant, and a refrigerant outflow pipe is inserted below, and one of the outflow pipes Since the part is made of a permeable membrane, the liquid refrigerant stored inside the header is confined by the refrigerating machine oil with high viscosity, and when the suction pressure of the refrigeration system drops, the permeation provided in a part of the outflow pipe Through the membrane,
By returning the liquid refrigerant to the compressor little by little, it is possible to prevent an abnormal decrease in suction pressure and maintain a predetermined refrigeration performance.

Further, since the porous filter is provided at the tip of the inflow pipe, ionic sludge such as organic acid or organic acid metal salt generated in the refrigeration system may block the permeable membrane. Therefore, the function of the permeable membrane that prevents the liquid refrigerant from gradually returning when the suction pressure decreases can be stably exhibited.

Further, since the adsorbent is installed below the inside of the container, ionic sludge such as organic acid or organic acid metal salt generated in the refrigeration system is prevented from blocking the permeable membrane. However, the function of the permeable membrane that gradually returns the liquid refrigerant when the suction pressure decreases can be stably exhibited.

Further, a compressor, a condenser, an expansion mechanism,
An evaporator and a header are connected in an annular shape, and in a refrigeration cycle provided with a refrigerant and a refrigerating machine oil having no or little mutual solubility in the refrigerant, the header is a refrigerant inflow pipe above a container for storing a liquid refrigerant. Has a structure in which the refrigerant outflow pipe is connected to the side, and the lower part of the container has a bellows-like structure, so that the liquid refrigerant stored inside the header is confined by high-viscosity refrigeration oil. When the suction pressure of the refrigeration system drops, the bellows part shrinks to reduce the volume of the refrigerant storage part of the header, and the liquid refrigerant is gradually returned to the compressor along with the refrigeration oil, so that the lubricity due to the suction of the liquid refrigerant is reduced. It is possible to prevent an abnormal decrease in the suction pressure of the compressor while suppressing the decrease, and it is possible to maintain a predetermined refrigeration performance while maintaining durability.

Also, a compressor, a condenser, an expansion mechanism,
An evaporator and a header are connected in an annular shape, and in a refrigeration cycle provided with a refrigerant and a refrigerating machine oil having no or little mutual solubility in the refrigerant, the header is a refrigerant inflow pipe above a container storing a liquid refrigerant. , And has a structure in which a refrigerant outflow pipe is connected to the side, and since the bellows is installed below the inside of the container, it is possible to reduce the mechanical strength of the bellows part and to reduce the wall thickness. By making it thin, it reacts sensitively to changes in suction pressure, and when the suction pressure drops, the bellows part extends and the volume of the refrigerant reservoir of the header is reduced,
By returning the liquid refrigerant to the compressor little by little with the refrigeration oil, while suppressing the deterioration of lubricity due to the suction of the liquid refrigerant,
It is possible to prevent abnormal reduction of the suction pressure of the compressor,
A predetermined refrigeration performance can be maintained while maintaining durability.

[Brief description of drawings]

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

FIG. 2 is a sectional view of the header of the same embodiment.

FIG. 3 is a sectional view of a header of a second embodiment of the refrigeration system according to the present invention.

FIG. 4 is a sectional view of a header of a third embodiment of the refrigeration system according to the present invention.

FIG. 5 is a refrigeration cycle diagram of a fourth embodiment of the refrigeration system according to the present invention.

FIG. 6 is a sectional view of the header of the same embodiment.

FIG. 7 is a refrigeration cycle diagram of a fifth embodiment of the refrigeration system according to the present invention.

FIG. 8 is a sectional view of the header of the same embodiment.

9A is a refrigeration cycle diagram of a conventional refrigeration system, and FIG. 9B is a sectional view of a header of a conventional refrigeration system.

[Explanation of symbols]

 1 Compressor 2 Condenser 4 Evaporator 5 Header 6 Suction pipe 7 Refrigerator oil 9 Outflow pipe 10 Outflow pipe 11 Container 13 Permeable membrane 15 Porous filter 16 Adsorbent 18 Container 18a Bellows part 20 Bellows

Front page continuation (72) Inventor Akihiro Jono 4-5, Takaida Hondori, Higashi-Osaka City, Osaka Prefecture Matsushita Refrigerator Co., Ltd. (72) Inventor Takeshi Shimizu 4-5-2 Takaida Hondori, Higashi Osaka, Osaka Prefecture No. Matsushita Refrigerator Co., Ltd. (72) Inventor Masaaki Tanaka 4-2-5 Takaidahondori, Higashiosaka-shi, Osaka Prefecture Matsushita Refrigerator Co., Ltd. (72) Minoru Yonemura 4-Chome Takaidamoto-dori, Higashi Osaka, Osaka Prefecture No. 5 inside Matsushita Cold Machinery Co., Ltd.

Claims (5)

[Claims] 1. A refrigeration cycle comprising a compressor, a condenser, an expansion mechanism, an evaporator and a header connected in an annular shape, and a refrigerant, and a refrigerating machine oil having no or little mutual solubility in the refrigerant, The header has a structure in which a refrigerant inflow pipe is connected to an upper portion of a container storing a liquid refrigerant, and a refrigerant outflow pipe is inserted in a lower portion, and a part of the outflow pipe has a pore diameter of 0.01 to 3 μm. A refrigeration system characterized by being formed of a permeable membrane of. 2. The refrigeration system according to claim 1, wherein a porous filter having a pore diameter of 3 to 30 μm is connected to the tip of the inflow pipe. 3. The refrigeration system according to claim 1, wherein an adsorbent made of zeolite or activated alumina is installed below the inside of the container. 4. A refrigeration cycle comprising a compressor, a condenser, an expansion mechanism, an evaporator and a header connected in an annular shape, and a refrigerant and a refrigerating machine oil having no or little mutual solubility in the refrigerant, The header has a structure in which a refrigerant inflow pipe is connected to an upper portion of a container that stores a liquid refrigerant, and a refrigerant outflow pipe is connected to a side portion, and a lower portion of the container has a bellows-like structure and has an internal structure. A refrigeration system characterized in that the internal volume changes due to pressure fluctuations. 5. A refrigeration cycle comprising a compressor, a condenser, an expansion mechanism, an evaporator and a header connected annularly, and a refrigerant and refrigerating machine oil having no or little mutual solubility in the refrigerant, The header has a structure in which a refrigerant inflow pipe is connected to an upper side of a container that stores a liquid refrigerant, and a refrigerant outflow pipe is connected to a side thereof, and the contents are formed below the inside of the container by fluctuations of internal and external pressures. A refrigeration system characterized by the installation of bellows whose volume changes.